Replace a statment lambda with method reference

Menu item to enable/disable disappearing messages

See merge request briar/briar!1321

.idea/runConfigurations/All_tests.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-android" />
+    <module name="briar.briar-android" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />

.idea/runConfigurations/All_tests_in_bramble_android.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-android" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-android" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-android" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-android" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_bramble_api.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-api" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-api" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-api" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-api" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_bramble_core.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-core" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-core" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-core" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_bramble_java.xml

@@ -1,8 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-java" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-java" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-java" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
@@ -10,11 +8,8 @@
     <option name="VM_PARAMETERS" value="-ea -Djava.library.path=libs" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-java" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_briar_android.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-android" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-android" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.briar-android" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/briar-android" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_briar_core.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-core" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.briar-core" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/briar-core" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_briar_headless.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-headless" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-headless" />
+    <module name="briar.briar-headless" />
     <option name="PACKAGE_NAME" value="org.briarproject.briar.headless" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />

.idea/runConfigurations/H2_Performance_Test.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="H2 Performance Test" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-core" />
     <option name="PACKAGE_NAME" value="org.briarproject.bramble.db" />
     <option name="MAIN_CLASS_NAME" value="org.briarproject.bramble.db.H2DatabasePerformanceTest" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="class" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/HyperSQL_Performance_Test.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="HyperSQL Performance Test" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-core" />
     <option name="PACKAGE_NAME" value="org.briarproject.bramble.db" />
     <option name="MAIN_CLASS_NAME" value="org.briarproject.bramble.db.HyperSqlDatabasePerformanceTest" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="class" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/briar_headless.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="briar-headless" type="JetRunConfigurationType" factoryName="Kotlin" singleton="true">
-    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+  <configuration default="false" name="briar-headless" type="JetRunConfigurationType" singleton="true">
+    <module name="briar.briar-headless" />
     <option name="VM_PARAMETERS" value="" />
     <option name="PROGRAM_PARAMETERS" value="-v" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
@@ -8,9 +8,8 @@
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="MAIN_CLASS_NAME" value="org.briarproject.briar.headless.MainKt" />
     <option name="WORKING_DIRECTORY" value="" />
-    <module name="briar-headless" />
-    <envs />
-    <method>
+    <method v="2">
+      <option name="Make" enabled="true" />
       <option name="Gradle.BeforeRunTask" enabled="true" tasks="jar" externalProjectPath="$PROJECT_DIR$/briar-headless" vmOptions="" scriptParameters="" />
     </method>
   </configuration>

bramble-android/build.gradle

@@ -38,7 +38,7 @@ configurations {
 
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	tor 'org.briarproject:tor-android:0.3.5.10@zip'
+	tor 'org.briarproject:tor-android:0.3.5.12@zip'
 	tor 'org.briarproject:obfs4proxy-android:0.0.11-2@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'

bramble-android/witness.gradle

@@ -1,33 +1,36 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.android.tools.analytics-library:protos:26.5.1:protos-26.5.1.jar:8dde1130725461fe827f2a343d353f2b51e8870661fc860d7d5ebddb097ead4e',
-        'com.android.tools.analytics-library:shared:26.5.1:shared-26.5.1.jar:ccc2f3b00ec17b11401610ba68553544fc8fc517120e84439ac6eb86b875e18d',
-        'com.android.tools.analytics-library:tracker:26.5.1:tracker-26.5.1.jar:3a76984c0fe2e847ca7a8b35b4780ef0447a9d1666946cb8e60466318e0ab5ae',
-        'com.android.tools.build:aapt2-proto:0.4.0:aapt2-proto-0.4.0.jar:fac0435e08898f89eeeb9ca236bea707155ff816c12205ced285ad53604133ca',
-        'com.android.tools.build:apksig:3.5.1:apksig-3.5.1.jar:1fd33e7f009a2a0da766cfeec4211a09f548034b015c289a66d75dd8a9302f4a',
-        'com.android.tools.build:apkzlib:3.5.1:apkzlib-3.5.1.jar:9f330167cbe973b7db407692f74f4f6453b7ffa5f2048934b06280c2ceee60fa',
-        'com.android.tools.build:builder-model:3.5.1:builder-model-3.5.1.jar:39ea3c82b76b6e0c9f9fa88d93e0edc1dd4a0f1dfae0ef6fbf2d451da47e5450',
-        'com.android.tools.build:builder-test-api:3.5.1:builder-test-api-3.5.1.jar:a1b59305584cbcaa078fdc9cfb80871012755b822dd32e8da19add6f7bbcb762',
-        'com.android.tools.build:builder:3.5.1:builder-3.5.1.jar:e3a8d382434c5f60990730c4719fc814e85a898a33a1e96c1df8d627d3c6eea6',
-        'com.android.tools.build:gradle-api:3.5.1:gradle-api-3.5.1.jar:be9b41859bace11998f66b04ed944f87e413f3ad6da3c4665587699da125addc',
-        'com.android.tools.build:manifest-merger:26.5.1:manifest-merger-26.5.1.jar:dcad9ecb967251f4d750f55a4204a2b400e8fbfe5cb930a1d0d5dbe10ae8bdfc',
-        'com.android.tools.ddms:ddmlib:26.5.1:ddmlib-26.5.1.jar:b081aef2a4ed3f4d47cae4cdb128469735f25a114e026d37123bf9ffdec742a8',
-        'com.android.tools.external.com-intellij:intellij-core:26.5.1:intellij-core-26.5.1.jar:20eced30adc124805bd93488d9cd9d3e33e6bf7b48e9fe5a703d4983f894d450',
-        'com.android.tools.external.com-intellij:kotlin-compiler:26.5.1:kotlin-compiler-26.5.1.jar:5aed762dd54875b77ae7018d97c05756ff0c5b9fd02ec595dd396ccd14cc22cb',
-        'com.android.tools.external.org-jetbrains:uast:26.5.1:uast-26.5.1.jar:4bc8653d6c0943f40fee963a149e36c6baa45683d2530968a13f5007e3c40740',
-        'com.android.tools.layoutlib:layoutlib-api:26.5.1:layoutlib-api-26.5.1.jar:88732f11396c427273e515d23042e35633f4fe4295528a99b866aa2adf0efd9c',
-        'com.android.tools.lint:lint-api:26.5.1:lint-api-26.5.1.jar:ec33fcd72bfaf70dd841e03fbfd93f109c2e575aec146067c606689c3972f0de',
-        'com.android.tools.lint:lint-checks:26.5.1:lint-checks-26.5.1.jar:a1b9607d484aaae7a71dcecdc76f8003d8239af226c776894a2cf63f9e6c60d7',
-        'com.android.tools.lint:lint-gradle-api:26.5.1:lint-gradle-api-26.5.1.jar:82453fd98a8394cc84ed995c04d2cd744abd1d6589403427ba7eef53115406f3',
-        'com.android.tools.lint:lint-gradle:26.5.1:lint-gradle-26.5.1.jar:59465b56cf7db77c656d5f8195d721c3d48b6bdd0502d774de335bfe4baff00b',
-        'com.android.tools.lint:lint:26.5.1:lint-26.5.1.jar:336e4b04ec6f8b0f25879131b7a7862d77df83a1879ee5b71be26128755f8e2e',
-        'com.android.tools:annotations:26.5.1:annotations-26.5.1.jar:2c43c82f8c59d8f7a61e3239e1a2dc9f69dc342ec09af9b7c9f69b25337c0b6e',
-        'com.android.tools:common:26.5.1:common-26.5.1.jar:eccfa54486ed54c4e3123cc42195d023bd0dd21bcd2f0e4868e8c6fc70f8ef6b',
-        'com.android.tools:dvlib:26.5.1:dvlib-26.5.1.jar:46f93ad498b4756e7d867d2fe38c38890a80e7407a4ae459e4a8c8d5c5aeacfe',
-        'com.android.tools:repository:26.5.1:repository-26.5.1.jar:2b3ee791aa4c3e8ce60498c161a27ca7228816fc630eed4d9f25f2f36a106dce',
-        'com.android.tools:sdk-common:26.5.1:sdk-common-26.5.1.jar:365f749676c3574676fd465177c8a492f340816db2b520d6ed114d3b6e77bea7',
-        'com.android.tools:sdklib:26.5.1:sdklib-26.5.1.jar:007da104afb27c8c682a1628023fe9ec438249c8d15ef0fd6624c5bb8e23b696',
+        'com.android.tools.analytics-library:protos:27.1.1:protos-27.1.1.jar:13f77e73762e58ab372d140b3a6be6903aea9775b62dd14fbc62d4cc7069c9a4',
+        'com.android.tools.analytics-library:shared:27.1.1:shared-27.1.1.jar:82930a52001410e97d809930b670f4de3002286975f046b9de5f6b777b06d366',
+        'com.android.tools.analytics-library:tracker:27.1.1:tracker-27.1.1.jar:31bc5a00be0055bac89c9b2f34751883e987cd89e3ac1783720645c164f591d9',
+        'com.android.tools.build:aapt2-proto:4.1.0-alpha01-6193524:aapt2-proto-4.1.0-alpha01-6193524.jar:17e75523e1e92dd4f222c7368ee41df9e964a508232f591e265d0c499baf9dca',
+        'com.android.tools.build:apksig:4.1.1:apksig-4.1.1.jar:e0a69da9e5a03986d608b45bbf954ef0e6a0b3f58c1b8315bd169ec08b279e72',
+        'com.android.tools.build:apkzlib:4.1.1:apkzlib-4.1.1.jar:ba4b5e419b6be0130eae7f8301c3a551ad3976f487d2e0c6852ebb175ac41127',
+        'com.android.tools.build:builder-model:4.1.1:builder-model-4.1.1.jar:e95c99cc298ad67b8deb6ced99c51abc8f59afebedad044b1a10dde14646a4dd',
+        'com.android.tools.build:builder-test-api:4.1.1:builder-test-api-4.1.1.jar:464f596ab261c051c3847406748e843770dea123f6fa5fee8a9390644e709b7a',
+        'com.android.tools.build:builder:4.1.1:builder-4.1.1.jar:0f78d4759d2f7b57b95865522ec34596ba419b9982f3b25e3449213f9c98b80d',
+        'com.android.tools.build:gradle-api:4.1.1:gradle-api-4.1.1.jar:d42e6b539e4c1353ad3546e75ec8ce11a017b97481023e8ea18577eefe374358',
+        'com.android.tools.build:manifest-merger:27.1.1:manifest-merger-27.1.1.jar:7a45fa143687859bb2e5a961dcf6ee88094d3853de0cb543dc03dbcb0f4b554b',
+        'com.android.tools.ddms:ddmlib:27.1.1:ddmlib-27.1.1.jar:da6e4bd834b6a85dae8019039849d8bd96933347dfbf460df74913ddade6e40a',
+        'com.android.tools.external.com-intellij:intellij-core:27.1.1:intellij-core-27.1.1.jar:2591a7363c4443c59bf9f793730acafce9d6ec3076e2f46716edaf53a41b6fb6',
+        'com.android.tools.external.com-intellij:kotlin-compiler:27.1.1:kotlin-compiler-27.1.1.jar:5054ae770ba788f110303c65abd6b1fa28eccf52dee1274510e201b2b81885c8',
+        'com.android.tools.external.org-jetbrains:uast:27.1.1:uast-27.1.1.jar:54cd8f6886a9d2f5641659dd5c91f626629672cd48301f7f0bd6aad9bd448714',
+        'com.android.tools.layoutlib:layoutlib-api:27.1.1:layoutlib-api-27.1.1.jar:8a9a22e3b309521ea83b724e5a89cfdac6076f52d675c0e17d77b05527bc0f8c',
+        'com.android.tools.lint:lint-api:27.1.1:lint-api-27.1.1.jar:c1d8176094cb0478786070d40533efb578ebc53529a82f6ef5bee879bdca418b',
+        'com.android.tools.lint:lint-checks:27.1.1:lint-checks-27.1.1.jar:3899c91e00bd059b40c31a9ca00cd0f8303191947608735ae1b657323693fb61',
+        'com.android.tools.lint:lint-gradle-api:27.1.1:lint-gradle-api-27.1.1.jar:26aa89d38b9825cc73229daa82a68875801c8b8491f30497ce62aff1f206eb0d',
+        'com.android.tools.lint:lint-gradle:27.1.1:lint-gradle-27.1.1.jar:f7355823ead869f4d28184ba28b7a0c693b507519a2d3705bb9848a0f35b3756',
+        'com.android.tools.lint:lint-model:27.1.1:lint-model-27.1.1.jar:bc23c0c413bdfca59dac2cd56b870d8360d009e9ec0d365e71f774bcf127971d',
+        'com.android.tools.lint:lint:27.1.1:lint-27.1.1.jar:2f6038a5398a42bd591883c3f5e5894f4ec52ca1c3683bf94fa8553c1700af81',
+        'com.android.tools:annotations:27.1.1:annotations-27.1.1.jar:ff28c504d2acb9fd1a5ffbd97ae85cf59ee18c76927525aad250509bccf2cab1',
+        'com.android.tools:common:27.1.1:common-27.1.1.jar:63d9a2a9ad6d278db319f3749b9f50bdf5457ef7020074a1bebe124e714b535c',
+        'com.android.tools:dvlib:27.1.1:dvlib-27.1.1.jar:998a54201fc1cefee5f2399215e95c42b1f64f9e1d8f4452eb8255c68ba5440f',
+        'com.android.tools:repository:27.1.1:repository-27.1.1.jar:d25b74ccabf4d876903efb375e9af6fb380d8ae0445bb74bbdcc225c1e37fa1d',
+        'com.android.tools:sdk-common:27.1.1:sdk-common-27.1.1.jar:4473ae97d0ef7061ee1de61041d5aa97405ae08e44c09cf7bb278b42e4b97c7c',
+        'com.android.tools:sdklib:27.1.1:sdklib-27.1.1.jar:08e6b83961ac9724b3c1e3d0eff971f13be6701292c77914b8794480f3391250',
+        'com.android:signflinger:4.1.1:signflinger-4.1.1.jar:0c66825988873ec2d51057fa463f54a8f18fc7326ff4530b9da363b71e97ce60',
+        'com.android:zipflinger:4.1.1:zipflinger-4.1.1.jar:0a8c3e52ac13dd031236f9fb5ba4408b1d5dcd12325a05440b36da09d8881446',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
         'com.google.code.gson:gson:2.8.5:gson-2.8.5.jar:233a0149fc365c9f6edbd683cfe266b19bdc773be98eabdaf6b3c924b48e7d81',
         'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
@@ -35,27 +38,30 @@ dependencyVerification {
         'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
         'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
         'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
+        'com.google.errorprone:error_prone_annotations:2.3.2:error_prone_annotations-2.3.2.jar:357cd6cfb067c969226c442451502aee13800a24e950fdfde77bcdb4565a668d',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
         'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
-        'com.google.guava:guava:27.0.1-jre:guava-27.0.1-jre.jar:e1c814fd04492a27c38e0317eabeaa1b3e950ec8010239e400fe90ad6c9107b4',
         'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:guava:28.1-jre:guava-28.1-jre.jar:30beb8b8527bd07c6e747e77f1a92122c2f29d57ce347461a4a55eb26e382da4',
         'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
+        'com.google.j2objc:j2objc-annotations:1.3:j2objc-annotations-1.3.jar:21af30c92267bd6122c0e0b4d20cccb6641a37eaf956c6540ec471d584e64a7b',
         'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
-        'com.google.protobuf:protobuf-java:3.4.0:protobuf-java-3.4.0.jar:dce7e66b32456a1b1198da0caff3a8acb71548658391e798c79369241e6490a4',
+        'com.google.protobuf:protobuf-java:3.10.0:protobuf-java-3.10.0.jar:161d7d61a8cb3970891c299578702fd079646e032329d6c2cabf998d191437c9',
         'com.googlecode.json-simple:json-simple:1.1:json-simple-1.1.jar:2d9484f4c649f708f47f9a479465fc729770ee65617dca3011836602264f6439',
         'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
         'com.squareup:javawriter:2.5.0:javawriter-2.5.0.jar:fcfb09fb0ea0aa97d3cfe7ea792398081348e468f126b3603cb3803f240197f0',
         'com.sun.activation:javax.activation:1.2.0:javax.activation-1.2.0.jar:993302b16cd7056f21e779cc577d175a810bb4900ef73cd8fbf2b50f928ba9ce',
-        'com.sun.istack:istack-commons-runtime:2.21:istack-commons-runtime-2.21.jar:c33e67a0807095f02a0e2da139412dd7c4f9cc1a4c054b3e434f96831ba950f4',
-        'com.sun.xml.fastinfoset:FastInfoset:1.2.13:FastInfoset-1.2.13.jar:27a77db909f3c2833c0b1a37c55af1db06045118ad2eed96ce567b6632bce038',
+        'com.sun.istack:istack-commons-runtime:3.0.7:istack-commons-runtime-3.0.7.jar:6443e10ba2e259fb821d9b6becf10db5316285fc30c53cec9d7b19a3877e7fdf',
+        'com.sun.xml.fastinfoset:FastInfoset:1.2.15:FastInfoset-1.2.15.jar:785861db11ca1bd0d1956682b974ad73eb19cd3e01a4b3fa82d62eca97210aec',
         'commons-codec:commons-codec:1.10:commons-codec-1.10.jar:4241dfa94e711d435f29a4604a3e2de5c4aa3c165e23bd066be6fc1fc4309569',
         'commons-logging:commons-logging:1.2:commons-logging-1.2.jar:daddea1ea0be0f56978ab3006b8ac92834afeefbd9b7e4e6316fca57df0fa636',
         'it.unimi.dsi:fastutil:7.2.0:fastutil-7.2.0.jar:74fa208043740642f7e6eb09faba15965218ad2f50ce3020efb100136e4b591c',
+        'javax.activation:javax.activation-api:1.2.0:javax.activation-api-1.2.0.jar:43fdef0b5b6ceb31b0424b208b930c74ab58fac2ceeb7b3f6fd3aeb8b5ca4393',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
-        'javax.xml.bind:jaxb-api:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
+        'javax.xml.bind:jaxb-api:2.3.1:jaxb-api-2.3.1.jar:88b955a0df57880a26a74708bc34f74dcaf8ebf4e78843a28b50eae945732b06',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'net.sf.jopt-simple:jopt-simple:4.9:jopt-simple-4.9.jar:26c5856e954b5f864db76f13b86919b59c6eecf9fd930b96baa8884626baf2f5',
@@ -70,34 +76,35 @@ dependencyVerification {
         'org.bouncycastle:bcpkix-jdk15on:1.56:bcpkix-jdk15on-1.56.jar:7043dee4e9e7175e93e0b36f45b1ec1ecb893c5f755667e8b916eb8dd201c6ca',
         'org.bouncycastle:bcprov-jdk15on:1.56:bcprov-jdk15on-1.56.jar:963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349',
         'org.briarproject:obfs4proxy-android:0.0.11-2:obfs4proxy-android-0.0.11-2.zip:57e55cbe87aa2aac210fdbb6cd8cdeafe15f825406a08ebf77a8b787aa2c6a8a',
-        'org.briarproject:tor-android:0.3.5.10:tor-android-0.3.5.10.zip:edd83bf557fcff2105eaa0bdb3f607a6852ebe7360920929ae3039dd5f4774c5',
+        'org.briarproject:tor-android:0.3.5.12:tor-android-0.3.5.12.zip:db71fb3290acff79d572af0752570eaf6aad7c4d88c9b9aa0b4d5afe2b9ead9c',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
+        'org.checkerframework:checker-qual:2.8.1:checker-qual-2.8.1.jar:9103499008bcecd4e948da29b17864abb64304e15706444ae209d17ebe0575df',
         'org.codehaus.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
         'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
-        'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
-        'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
-        'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.18:animal-sniffer-annotations-1.18.jar:47f05852b48ee9baefef80fa3d8cea60efa4753c0013121dd7fe5eef2e5c729d',
+        'org.glassfish.jaxb:jaxb-runtime:2.3.1:jaxb-runtime-2.3.1.jar:45fecfa5c8217ce1f3652ab95179790ec8cc0dec0384bca51cbeb94a293d9f2f',
+        'org.glassfish.jaxb:txw2:2.3.1:txw2-2.3.1.jar:34975dde1c6920f1a39791142235689bc3cd357e24d05edd8ff93b885bd68d60',
         'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
         'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
-        'org.jetbrains.kotlin:kotlin-reflect:1.3.50:kotlin-reflect-1.3.50.jar:64583199ea5a54aefd1bd1595288925f784226ee562d1dd279011c6075b3d7a4',
-        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50:kotlin-stdlib-common-1.3.50.jar:8ce678e88e4ba018b66dacecf952471e4d7dfee156a8a819760a5a5ff29d323c',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50:kotlin-stdlib-jdk7-1.3.50.jar:9a026639e76212f8d57b86d55b075394c2e009f1979110751d34c05c5f75d57b',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50:kotlin-stdlib-jdk8-1.3.50.jar:1b351fb6e09c14b55525c74c1f4cf48942eae43c348b7bc764a5e6e423d4da0c',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.3.50:kotlin-stdlib-1.3.50.jar:e6f05746ee0366d0b52825a090fac474dcf44082c9083bbb205bd16976488d6c',
+        'org.jetbrains.kotlin:kotlin-reflect:1.3.72:kotlin-reflect-1.3.72.jar:a188d9367de1c4ee9479db630985c0597b20709c83161b1430d24edb27e38c40',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.72:kotlin-stdlib-common-1.3.72.jar:5e7d1552863e480c1628b1cc39ce230ef829f5b7230106215a05acda5172203a',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.72:kotlin-stdlib-jdk7-1.3.72.jar:40566c0c08d414b9413ba556ff7f8a0b04b98b9f0f424d122dd2088510efccc4',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.72:kotlin-stdlib-jdk8-1.3.72.jar:133da70cfc07b56094282eac5c59bccd59f167ee2ead22e5282876d8bc10bf95',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.3.72:kotlin-stdlib-1.3.72.jar:3856a7349ebacd6d1be6802b2fed9c4dc2c5a564ea92b6b945ac988243d4b16b',
         'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
         'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
         'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
         'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
         'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
         'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
-        'org.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
+        'org.jvnet.staxex:stax-ex:1.8:stax-ex-1.8.jar:95b05d9590af4154c6513b9c5dc1fb2e55b539972ba0a9ef28e9a0c01d83ad77',
         'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
-        'org.ow2.asm:asm-analysis:6.0:asm-analysis-6.0.jar:2f1a6387219c3a6cc4856481f221b03bd9f2408a326d416af09af5d6f608c1f4',
-        'org.ow2.asm:asm-commons:6.0:asm-commons-6.0.jar:f1bce5c648a96a017bdcd01fe5d59af9845297fd7b79b81c015a6fbbd9719abf',
-        'org.ow2.asm:asm-tree:6.0:asm-tree-6.0.jar:887998fb69727c8759e4d253f856822801e33f9fd4caa566b3ac58ee92106215',
-        'org.ow2.asm:asm-util:6.0:asm-util-6.0.jar:356afebdb0f870175262e5188f8709a3b17aa2a5a6a4b0340b04d4b449bca5f6',
+        'org.ow2.asm:asm-analysis:7.0:asm-analysis-7.0.jar:e981f8f650c4d900bb033650b18e122fa6b161eadd5f88978d08751f72ee8474',
+        'org.ow2.asm:asm-commons:7.0:asm-commons-7.0.jar:fed348ef05958e3e846a3ac074a12af5f7936ef3d21ce44a62c4fa08a771927d',
+        'org.ow2.asm:asm-tree:7.0:asm-tree-7.0.jar:cfd7a0874f9de36a999c127feeadfbfe6e04d4a71ee954d7af3d853f0be48a6c',
+        'org.ow2.asm:asm-util:7.0:asm-util-7.0.jar:75fbbca440ef463f41c2b0ab1a80abe67e910ac486da60a7863cbcb5bae7e145',
         'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
-        'org.ow2.asm:asm:6.0:asm-6.0.jar:dd8971c74a4e697899a8e95caae4ea8760ea6c486dc6b97b1795e75760420461',
+        'org.ow2.asm:asm:7.0:asm-7.0.jar:b88ef66468b3c978ad0c97fd6e90979e56155b4ac69089ba7a44e9aa7ffe9acf',
     ]
 }

bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.api.client;
 
 import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.crypto.PrivateKey;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.data.BdfDictionary;
@@ -119,4 +120,17 @@ public interface ClientHelper {
 	Map<TransportId, TransportProperties> parseAndValidateTransportPropertiesMap(
 			BdfDictionary properties) throws FormatException;
 
+	/**
+	 * Retrieves the contact ID from the group metadata of the given contact
+	 * group.
+	 */
+	ContactId getContactId(Transaction txn, GroupId contactGroupId)
+		throws DbException, FormatException;
+
+	/**
+	 * Stores the given contact ID in the group metadata of the given contact
+	 * group.
+	 */
+	void setContactId(Transaction txn, GroupId contactGroupId, ContactId c)
+		throws DbException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/client/ContactGroupConstants.java

@@ -0,0 +1,9 @@
+package org.briarproject.bramble.api.client;
+
+public interface ContactGroupConstants {
+
+	/**
+	 * Group metadata key for associating a contact ID with a contact group.
+	 */
+	String GROUP_KEY_CONTACT_ID = "contactId";
+}

bramble-api/src/main/java/org/briarproject/bramble/util/ValidationUtils.java

@@ -6,7 +6,9 @@ import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
+import javax.annotation.concurrent.Immutable;
 
+@Immutable
 @NotNullByDefault
 public class ValidationUtils {
 
@@ -64,4 +66,9 @@ public class ValidationUtils {
 		if (dictionary != null && dictionary.size() != size)
 			throw new FormatException();
 	}
+
+	public static void checkRange(@Nullable Long l, long min, long max)
+			throws FormatException {
+		if (l != null && (l < min || l > max)) throw new FormatException();
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java

@@ -2,11 +2,13 @@ package org.briarproject.bramble.client;
 
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.client.ClientHelper;
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.crypto.KeyParser;
 import org.briarproject.bramble.api.crypto.PrivateKey;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.data.BdfDictionary;
+import org.briarproject.bramble.api.data.BdfEntry;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfReader;
 import org.briarproject.bramble.api.data.BdfReaderFactory;
@@ -39,6 +41,7 @@ import java.util.Map.Entry;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
+import static org.briarproject.bramble.api.client.ContactGroupConstants.GROUP_KEY_CONTACT_ID;
 import static org.briarproject.bramble.api.identity.Author.FORMAT_VERSION;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
@@ -389,4 +392,27 @@ class ClientHelperImpl implements ClientHelper {
 		return tpMap;
 	}
 
+	@Override
+	public ContactId getContactId(Transaction txn, GroupId contactGroupId)
+			throws DbException {
+		try {
+			BdfDictionary meta =
+					getGroupMetadataAsDictionary(txn, contactGroupId);
+			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
+		} catch (FormatException e) {
+			throw new DbException(e); // Invalid group metadata
+		}
+	}
+
+	@Override
+	public void setContactId(Transaction txn, GroupId contactGroupId,
+			ContactId c) throws DbException {
+		BdfDictionary meta = BdfDictionary.of(
+				new BdfEntry(GROUP_KEY_CONTACT_ID, c.getInt()));
+		try {
+			mergeGroupMetadata(txn, contactGroupId, meta);
+		} catch (FormatException e) {
+			throw new AssertionError(e);
+		}
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningConstants.java

@@ -5,6 +5,5 @@ interface ClientVersioningConstants {
 	// Metadata keys
 	String MSG_KEY_UPDATE_VERSION = "version";
 	String MSG_KEY_LOCAL = "local";
-	String GROUP_KEY_CONTACT_ID = "contactId";
 }
 

bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java

@@ -50,7 +50,6 @@ import static java.util.Collections.emptyList;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
 import static org.briarproject.bramble.api.sync.Group.Visibility.VISIBLE;
-import static org.briarproject.bramble.versioning.ClientVersioningConstants.GROUP_KEY_CONTACT_ID;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_LOCAL;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_UPDATE_VERSION;
 
@@ -161,13 +160,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		db.addGroup(txn, g);
 		db.setGroupVisibility(txn, c.getId(), g.getId(), SHARED);
 		// Attach the contact ID to the group
-		BdfDictionary meta = new BdfDictionary();
-		meta.put(GROUP_KEY_CONTACT_ID, c.getId().getInt());
-		try {
-			clientHelper.mergeGroupMetadata(txn, g.getId(), meta);
-		} catch (FormatException e) {
-			throw new AssertionError(e);
-		}
+		clientHelper.setContactId(txn, g.getId(), c.getId());
 		// Create and store the first local update
 		List<ClientVersion> versions = new ArrayList<>(clients);
 		Collections.sort(versions);
@@ -229,7 +222,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			Map<ClientMajorVersion, Visibility> after =
 					getVisibilities(newLocalStates, newRemoteStates);
 			// Call hooks for any visibilities that have changed
-			ContactId c = getContactId(txn, m.getGroupId());
+			ContactId c = clientHelper.getContactId(txn, m.getGroupId());
 			if (!before.equals(after)) {
 				Contact contact = db.getContact(txn, c);
 				callVisibilityHooks(txn, contact, before, after);
@@ -521,17 +514,6 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		storeUpdate(txn, g, states, 1);
 	}
 
-	private ContactId getContactId(Transaction txn, GroupId g)
-			throws DbException {
-		try {
-			BdfDictionary meta =
-					clientHelper.getGroupMetadataAsDictionary(txn, g);
-			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
-		} catch (FormatException e) {
-			throw new DbException(e);
-		}
-	}
-
 	private List<ClientState> updateStatesFromRemoteStates(
 			List<ClientState> oldLocalStates, List<ClientState> remoteStates) {
 		Set<ClientMajorVersion> remoteSet = new HashSet<>();

bramble-core/src/test/java/org/briarproject/bramble/versioning/ClientVersioningManagerImplTest.java

@@ -38,7 +38,6 @@ import static org.briarproject.bramble.test.TestUtils.getContact;
 import static org.briarproject.bramble.test.TestUtils.getGroup;
 import static org.briarproject.bramble.test.TestUtils.getMessage;
 import static org.briarproject.bramble.test.TestUtils.getRandomId;
-import static org.briarproject.bramble.versioning.ClientVersioningConstants.GROUP_KEY_CONTACT_ID;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_LOCAL;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_UPDATE_VERSION;
 import static org.junit.Assert.assertEquals;
@@ -60,8 +59,6 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 	private final ClientId clientId = getClientId();
 	private final long now = System.currentTimeMillis();
 	private final Transaction txn = new Transaction(null, false);
-	private final BdfDictionary groupMeta = BdfDictionary.of(
-			new BdfEntry(GROUP_KEY_CONTACT_ID, contact.getId().getInt()));
 
 	private ClientVersioningManagerImpl createInstance() {
 		context.checking(new Expectations() {{
@@ -123,8 +120,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(db).addGroup(txn, contactGroup);
 			oneOf(db).setGroupVisibility(txn, contact.getId(),
 					contactGroup.getId(), SHARED);
-			oneOf(clientHelper).mergeGroupMetadata(txn, contactGroup.getId(),
-					groupMeta);
+			oneOf(clientHelper).setContactId(txn, contactGroup.getId(),
+					contact.getId());
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(now));
 			oneOf(clientHelper).createMessage(contactGroup.getId(), now,
@@ -460,9 +457,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(db).deleteMessage(txn, oldRemoteUpdateId);
 			oneOf(db).deleteMessageMetadata(txn, oldRemoteUpdateId);
 			// Get contact ID
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			// No states or visibilities have changed
 		}});
 
@@ -492,10 +488,9 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			// Load the latest local update
 			oneOf(clientHelper).getMessageAsList(txn, oldLocalUpdateId);
 			will(returnValue(oldLocalUpdateBody));
-			// Get client ID
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			// Get contact ID
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			// No states or visibilities have changed
 		}});
 
@@ -546,8 +541,6 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 		BdfDictionary newLocalUpdateMeta = BdfDictionary.of(
 				new BdfEntry(MSG_KEY_UPDATE_VERSION, 2L),
 				new BdfEntry(MSG_KEY_LOCAL, true));
-		BdfDictionary groupMeta = BdfDictionary.of(
-				new BdfEntry(GROUP_KEY_CONTACT_ID, contact.getId().getInt()));
 
 		context.checking(new Expectations() {{
 			oneOf(clientHelper).toList(newRemoteUpdate);
@@ -577,9 +570,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).addLocalMessage(txn, newLocalUpdate,
 					newLocalUpdateMeta, true, false);
 			// The client's visibility has changed
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			oneOf(db).getContact(txn, contact.getId());
 			will(returnValue(contact));
 			oneOf(hook).onClientVisibilityChanging(txn, contact, visibility);
@@ -619,8 +611,6 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 		BdfDictionary newLocalUpdateMeta = BdfDictionary.of(
 				new BdfEntry(MSG_KEY_UPDATE_VERSION, 2L),
 				new BdfEntry(MSG_KEY_LOCAL, true));
-		BdfDictionary groupMeta = BdfDictionary.of(
-				new BdfEntry(GROUP_KEY_CONTACT_ID, contact.getId().getInt()));
 
 		context.checking(new Expectations() {{
 			oneOf(clientHelper).toList(newRemoteUpdate);
@@ -650,9 +640,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).addLocalMessage(txn, newLocalUpdate,
 					newLocalUpdateMeta, true, false);
 			// The client's visibility has changed
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			oneOf(db).getContact(txn, contact.getId());
 			will(returnValue(contact));
 			oneOf(hook).onClientVisibilityChanging(txn, contact, INVISIBLE);

bramble-java/build.gradle

@@ -16,7 +16,7 @@ dependencies {
 	implementation fileTree(dir: 'libs', include: '*.jar')
 	implementation 'net.java.dev.jna:jna:4.5.2'
 	implementation 'net.java.dev.jna:jna-platform:4.5.2'
-	tor 'org.briarproject:tor:0.3.5.10@zip'
+	tor 'org.briarproject:tor:0.3.5.12@zip'
 	tor 'org.briarproject:obfs4proxy:0.0.7@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'

bramble-java/witness.gradle

@@ -24,7 +24,7 @@ dependencyVerification {
         'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
         'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
         'org.briarproject:obfs4proxy:0.0.7:obfs4proxy-0.0.7.zip:5b2f693262ce43a7e130f7cc7d5d1617925330640a2eb6d71085e95df8ee0642',
-        'org.briarproject:tor:0.3.5.10:tor-0.3.5.10.zip:7b387d3523ae8af289c23be59dc4c64ec5d3721385d7825a09705095e3318d5c',
+        'org.briarproject:tor:0.3.5.12:tor-0.3.5.12.zip:2f542c4befd216f2226bf7c76e3b8b2d99af6f146a8cb28bf727f42014587006',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',

briar-android/build.gradle

@@ -93,12 +93,12 @@ dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
 	implementation project(':bramble-android')
 
-	implementation 'androidx.preference:preference:1.1.0'
-	implementation 'androidx.exifinterface:exifinterface:1.0.0'
-	implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
-	implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
-	implementation 'com.google.android.material:material:1.1.0-beta01'
-	implementation 'androidx.recyclerview:recyclerview-selection:1.1.0-rc01'
+	implementation 'androidx.preference:preference:1.1.1'
+	implementation 'androidx.exifinterface:exifinterface:1.3.1'
+	implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
+	implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+	implementation 'com.google.android.material:material:1.2.1'
+	implementation 'androidx.recyclerview:recyclerview-selection:1.1.0-rc03'
 
 	implementation 'ch.acra:acra:4.11'
 	implementation 'info.guardianproject.panic:panic:1.0'
@@ -106,7 +106,7 @@ dependencies {
 	implementation 'de.hdodenhof:circleimageview:3.0.1'
 	implementation 'com.google.zxing:core:3.3.3'  // newer version need minSdk 24
 	implementation 'uk.co.samuelwall:material-tap-target-prompt:3.0.0'
-	implementation 'com.vanniktech:emoji-google:0.6.0'
+	implementation 'com.vanniktech:emoji-google:0.6.0' // newer versions need minSdk 21
 	implementation 'com.github.kobakei:MaterialFabSpeedDial:1.2.1'
 	implementation 'com.github.chrisbanes:PhotoView:2.3.0'
 	def glideVersion = '4.10.0'
@@ -120,13 +120,13 @@ dependencies {
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
-	def espressoVersion = '3.2.0'
+	def espressoVersion = '3.3.0'
 	def jmockVersion = '2.8.2'
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
-	testImplementation 'androidx.test:runner:1.2.0'
-	testImplementation 'androidx.test.ext:junit:1.1.1'
-	testImplementation 'androidx.fragment:fragment-testing:1.1.0'
+	testImplementation 'androidx.test:runner:1.3.0'
+	testImplementation 'androidx.test.ext:junit:1.1.2'
+	testImplementation 'androidx.fragment:fragment-testing:1.2.5'
 	testImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
 	testImplementation 'org.robolectric:robolectric:4.3.1'
 	testImplementation 'org.mockito:mockito-core:3.1.0'
@@ -136,7 +136,7 @@ dependencies {
 	testImplementation "org.jmock:jmock-legacy:$jmockVersion"
 
 	androidTestImplementation project(path: ':bramble-api', configuration: 'testOutput')
-	androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+	androidTestImplementation 'androidx.test.ext:junit:1.1.2'
 	androidTestImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
 	androidTestImplementation "androidx.test.espresso:espresso-contrib:$espressoVersion"
 	androidTestImplementation "androidx.test.espresso:espresso-intents:$espressoVersion"

briar-android/proguard-rules.txt

@@ -37,3 +37,6 @@
 
 # Glide
 -dontwarn com.bumptech.glide.load.engine.cache.DiskLruCacheWrapper
+
+# Dependency injection annotations, needed for UI tests on older API levels
+-keep class javax.inject.**

briar-android/src/main/AndroidManifest.xml

@@ -141,6 +141,16 @@
 				android:value="org.briarproject.briar.android.conversation.ConversationActivity" />
 		</activity>
 
+		<activity
+			android:name=".android.conversation.ConversationSettingsActivity"
+			android:parentActivityName="org.briarproject.briar.android.conversation.ConversationActivity"
+			android:label="@string/disappearing_messages_title"
+			android:theme="@style/BriarTheme">
+			<meta-data
+				android:name="android.support.PARENT_ACTIVITY"
+				android:value="org.briarproject.briar.android.conversation.ConversationActivity" />
+		</activity>
+
 		<activity
 			android:name="org.briarproject.briar.android.privategroup.creation.CreateGroupActivity"
 			android:label="@string/groups_create_group_title"

briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java

@@ -14,6 +14,7 @@ import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.crypto.CryptoExecutor;
 import org.briarproject.bramble.api.crypto.PasswordStrengthEstimator;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementTask;
@@ -39,6 +40,7 @@ import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.android.DozeWatchdog;
 import org.briarproject.briar.api.android.LockManager;
 import org.briarproject.briar.api.android.ScreenFilterMonitor;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
 import org.briarproject.briar.api.blog.BlogManager;
 import org.briarproject.briar.api.blog.BlogPostFactory;
 import org.briarproject.briar.api.blog.BlogSharingManager;
@@ -169,6 +171,10 @@ public interface AndroidComponent
 
 	AndroidWakeLockManager wakeLockManager();
 
+	TransactionManager transactionManager();
+
+	AutoDeleteManager autoDeleteManager();
+
 	void inject(SignInReminderReceiver briarService);
 
 	void inject(BriarService briarService);

briar-android/src/main/java/org/briarproject/briar/android/account/AuthorNameFragment.java

@@ -17,7 +17,6 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 
 import javax.annotation.Nullable;
 
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.util.StringUtils.toUtf8;
 import static org.briarproject.briar.android.util.UiUtils.setError;
@@ -45,7 +44,7 @@ public class AuthorNameFragment extends SetupFragment {
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(getString(R.string.setup_title));
+		requireActivity().setTitle(getString(R.string.setup_title));
 		View v = inflater.inflate(R.layout.fragment_setup_author_name,
 				container, false);
 		authorNameWrapper = v.findViewById(R.id.nickname_entry_wrapper);

briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java

@@ -20,7 +20,6 @@ import androidx.annotation.Nullable;
 
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_DOZE_WHITELISTING;
 import static org.briarproject.briar.android.util.UiUtils.showOnboardingDialog;
 
@@ -50,10 +49,10 @@ public class DozeFragment extends SetupFragment
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(getString(R.string.setup_doze_title));
+		requireActivity().setTitle(getString(R.string.setup_doze_title));
 		setHasOptionsMenu(false);
 		View v = inflater.inflate(R.layout.fragment_setup_doze, container,
-						false);
+				false);
 		dozeView = v.findViewById(R.id.dozeView);
 		dozeView.setOnCheckedChangedListener(this);
 		huaweiView = v.findViewById(R.id.huaweiView);
@@ -78,7 +77,8 @@ public class DozeFragment extends SetupFragment
 	}
 
 	@Override
-	public void onActivityResult(int request, int result, Intent data) {
+	public void onActivityResult(int request, int result,
+			@Nullable Intent data) {
 		super.onActivityResult(request, result, data);
 		if (request == REQUEST_DOZE_WHITELISTING) {
 			if (!dozeView.needsToBeShown() || secondAttempt) {
@@ -92,11 +92,7 @@ public class DozeFragment extends SetupFragment
 
 	@Override
 	public void onCheckedChanged() {
-		if (dozeView.isChecked() && huaweiView.isChecked()) {
-			next.setEnabled(true);
-		} else {
-			next.setEnabled(false);
-		}
+		next.setEnabled(dozeView.isChecked() && huaweiView.isChecked());
 	}
 
 	@SuppressLint("BatteryLife")

briar-android/src/main/java/org/briarproject/briar/android/account/SetPasswordFragment.java

@@ -24,7 +24,6 @@ import static android.content.Context.INPUT_METHOD_SERVICE;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 import static android.view.inputmethod.EditorInfo.IME_ACTION_DONE;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_WEAK;
 import static org.briarproject.briar.android.util.UiUtils.setError;
 
@@ -55,7 +54,7 @@ public class SetPasswordFragment extends SetupFragment {
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(getString(R.string.setup_password_intro));
+		requireActivity().setTitle(getString(R.string.setup_password_intro));
 		View v = inflater.inflate(R.layout.fragment_setup_password, container,
 						false);
 

briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java

@@ -28,6 +28,8 @@ import org.briarproject.briar.android.contact.add.remote.NicknameFragment;
 import org.briarproject.briar.android.contact.add.remote.PendingContactListActivity;
 import org.briarproject.briar.android.conversation.AliasDialogFragment;
 import org.briarproject.briar.android.conversation.ConversationActivity;
+import org.briarproject.briar.android.conversation.ConversationSettingsActivity;
+import org.briarproject.briar.android.conversation.ConversationSettingsFragment;
 import org.briarproject.briar.android.conversation.ImageActivity;
 import org.briarproject.briar.android.conversation.ImageFragment;
 import org.briarproject.briar.android.forum.CreateForumActivity;
@@ -184,6 +186,8 @@ public interface ActivityComponent {
 
 	void inject(PendingContactListActivity activity);
 
+	void inject(ConversationSettingsActivity activity);
+
 	// Fragments
 
 	void inject(AuthorNameFragment fragment);
@@ -234,4 +238,6 @@ public interface ActivityComponent {
 
 	void inject(ImageFragment imageFragment);
 
+	void inject(ConversationSettingsFragment conversationSettingsFragment);
+
 }

briar-android/src/main/java/org/briarproject/briar/android/blog/BasePostFragment.java

@@ -25,7 +25,6 @@ import androidx.annotation.UiThread;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.util.UiUtils.MIN_DATE_RESOLUTION;
@@ -55,7 +54,7 @@ abstract class BasePostFragment extends BaseFragment {
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 		// retrieve MessageId of blog post from arguments
-		byte[] p = requireNonNull(getArguments()).getByteArray(POST_ID);
+		byte[] p = requireArguments().getByteArray(POST_ID);
 		if (p == null) throw new IllegalStateException("No post ID in args");
 		postId = new MessageId(p);
 

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogFragment.java

@@ -46,7 +46,6 @@ import static android.app.Activity.RESULT_OK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.widget.Toast.LENGTH_SHORT;
 import static com.google.android.material.snackbar.Snackbar.LENGTH_LONG;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_SHARE_BLOG;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_WRITE_BLOG_POST;
@@ -97,14 +96,14 @@ public class BlogFragment extends BaseFragment
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		byte[] b = args.getByteArray(GROUP_ID);
 		if (b == null) throw new IllegalStateException("No group ID in args");
 		groupId = new GroupId(b);
 
 		View v = inflater.inflate(R.layout.fragment_blog, container, false);
 
-		adapter = new BlogPostAdapter(requireNonNull(getActivity()), this,
+		adapter = new BlogPostAdapter(requireActivity(), this,
 				getFragmentManager());
 		list = v.findViewById(R.id.postList);
 		layoutManager = new LinearLayoutManager(getActivity());
@@ -196,7 +195,8 @@ public class BlogFragment extends BaseFragment
 	}
 
 	@Override
-	public void onActivityResult(int request, int result, Intent data) {
+	public void onActivityResult(int request, int result,
+			@Nullable Intent data) {
 		super.onActivityResult(request, result, data);
 
 		if (request == REQUEST_WRITE_BLOG_POST && result == RESULT_OK) {

briar-android/src/main/java/org/briarproject/briar/android/blog/FeedFragment.java

@@ -35,7 +35,6 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import static android.app.Activity.RESULT_OK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static com.google.android.material.snackbar.Snackbar.LENGTH_LONG;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_WRITE_BLOG_POST;
 
@@ -79,7 +78,7 @@ public class FeedFragment extends BaseFragment implements
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(R.string.blogs_button);
+		requireActivity().setTitle(R.string.blogs_button);
 
 		View v = inflater.inflate(R.layout.fragment_blog, container, false);
 
@@ -103,7 +102,8 @@ public class FeedFragment extends BaseFragment implements
 	}
 
 	@Override
-	public void onActivityResult(int requestCode, int resultCode, Intent data) {
+	public void onActivityResult(int requestCode, int resultCode,
+			@Nullable Intent data) {
 		super.onActivityResult(requestCode, resultCode, data);
 
 		// The BlogPostAddedEvent arrives when the controller is not listening

briar-android/src/main/java/org/briarproject/briar/android/blog/FeedPostFragment.java

@@ -18,7 +18,6 @@ import javax.inject.Inject;
 
 import androidx.annotation.UiThread;
 
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 
 @UiThread
@@ -54,7 +53,7 @@ public class FeedPostFragment extends BasePostFragment {
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		byte[] b = args.getByteArray(GROUP_ID);
 		if (b == null) throw new IllegalStateException("No group ID in args");
 		blogId = new GroupId(b);

briar-android/src/main/java/org/briarproject/briar/android/blog/ReblogFragment.java

@@ -74,7 +74,7 @@ public class ReblogFragment extends BaseFragment implements SendListener {
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		GroupId blogId =
 				new GroupId(requireNonNull(args.getByteArray(GROUP_ID)));
 		MessageId postId =

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListFragment.java

@@ -62,7 +62,6 @@ import static android.os.Build.VERSION.SDK_INT;
 import static androidx.core.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
 import static androidx.core.view.ViewCompat.getTransitionName;
 import static com.google.android.material.snackbar.BaseTransientBottomBar.LENGTH_INDEFINITE;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -122,7 +121,7 @@ public class ContactListFragment extends BaseFragment implements EventListener,
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(R.string.contact_list_button);
+		requireActivity().setTitle(R.string.contact_list_button);
 
 		View contentView = inflater.inflate(R.layout.fragment_contact_list,
 				container, false);
@@ -274,8 +273,8 @@ public class ContactListFragment extends BaseFragment implements EventListener,
 			removeItem(((ContactRemovedEvent) e).getContactId());
 		} else if (e instanceof ConversationMessageReceivedEvent) {
 			LOG.info("Conversation message received, updating item");
-			ConversationMessageReceivedEvent p =
-					(ConversationMessageReceivedEvent) e;
+			ConversationMessageReceivedEvent<?> p =
+					(ConversationMessageReceivedEvent<?>) e;
 			ConversationMessageHeader h = p.getMessageHeader();
 			updateItem(p.getContactId(), h);
 		} else if (e instanceof PendingContactAddedEvent ||
@@ -317,7 +316,7 @@ public class ContactListFragment extends BaseFragment implements EventListener,
 	@UiThread
 	private void showSnackBar() {
 		if (snackbar != null) return;
-		View v = requireNonNull(getView());
+		View v = requireView();
 		int stringRes = R.string.pending_contact_requests_snackbar;
 		snackbar = new BriarSnackbarBuilder()
 				.setAction(R.string.show, view -> showPendingContactList())

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java

@@ -33,7 +33,6 @@ import androidx.lifecycle.ViewModelProviders;
 
 import static android.content.Context.CLIPBOARD_SERVICE;
 import static android.widget.Toast.LENGTH_SHORT;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.contact.HandshakeLinkConstants.LINK_REGEX;
 import static org.briarproject.briar.android.util.UiUtils.observeOnce;
 
@@ -83,8 +82,8 @@ public class LinkExchangeFragment extends BaseFragment
 			linkInput.setText(viewModel.getRemoteHandshakeLink());
 		}
 
-		clipboard = (ClipboardManager) requireNonNull(
-				getContext().getSystemService(CLIPBOARD_SERVICE));
+		clipboard = (ClipboardManager)
+				requireContext().getSystemService(CLIPBOARD_SERVICE);
 
 		Button pasteButton = v.findViewById(R.id.pasteButton);
 		pasteButton.setOnClickListener(view -> {
@@ -107,7 +106,7 @@ public class LinkExchangeFragment extends BaseFragment
 
 	@Override
 	public void onGlobalLayout() {
-		ScrollView scrollView = (ScrollView) requireNonNull(getView());
+		ScrollView scrollView = (ScrollView) requireView();
 		View layout = scrollView.getChildAt(0);
 		int scrollBy = layout.getHeight() - scrollView.getHeight();
 		if (scrollBy > 0) {
@@ -121,7 +120,7 @@ public class LinkExchangeFragment extends BaseFragment
 	}
 
 	private void onHandshakeLinkLoaded(String link) {
-		View v = requireNonNull(getView());
+		View v = requireView();
 
 		TextView linkView = v.findViewById(R.id.linkView);
 		linkView.setText(link);

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/NicknameFragment.java

@@ -31,6 +31,7 @@ import javax.inject.Inject;
 
 import androidx.annotation.StringRes;
 import androidx.appcompat.app.AlertDialog.Builder;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -117,7 +118,8 @@ public class NicknameFragment extends BaseFragment {
 		addButton.setVisibility(INVISIBLE);
 		progressBar.setVisibility(VISIBLE);
 
-		viewModel.getAddContactResult().observe(this, result -> {
+		LifecycleOwner owner = getViewLifecycleOwner();
+		viewModel.getAddContactResult().observe(owner, result -> {
 			if (result == null) return;
 			if (result.hasError())
 				handleException(name, requireNonNull(result.getException()));

briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorFragment.java

@@ -26,7 +26,6 @@ import javax.annotation.Nullable;
 import androidx.annotation.CallSuper;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.contactselection.ContactSelectorActivity.CONTACTS;
 import static org.briarproject.briar.android.contactselection.ContactSelectorActivity.getContactsFromIds;
@@ -55,7 +54,7 @@ public abstract class BaseContactSelectorFragment<I extends SelectableContactIte
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		byte[] b = args.getByteArray(GROUP_ID);
 		if (b == null) throw new IllegalStateException("No GroupId");
 		groupId = new GroupId(b);
@@ -74,7 +73,7 @@ public abstract class BaseContactSelectorFragment<I extends SelectableContactIte
 		list.setEmptyImage(R.drawable.ic_empty_state_contact_list);
 		list.setEmptyText(getString(R.string.no_contacts_selector));
 		list.setEmptyAction(getString(R.string.no_contacts_selector_action));
-		adapter = getAdapter(requireNonNull(getContext()), this);
+		adapter = getAdapter(requireContext(), this);
 		list.setAdapter(adapter);
 
 		// restore selected contacts if available

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java

@@ -140,6 +140,8 @@ import static org.briarproject.briar.android.util.UiUtils.getBulbTransitionName;
 import static org.briarproject.briar.android.util.UiUtils.observeOnce;
 import static org.briarproject.briar.api.messaging.MessagingConstants.MAX_ATTACHMENTS_PER_MESSAGE;
 import static org.briarproject.briar.api.messaging.MessagingConstants.MAX_PRIVATE_MESSAGE_TEXT_LENGTH;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_IMAGES_AUTO_DELETE;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_ONLY;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -273,15 +275,11 @@ public class ConversationActivity extends BriarActivity
 			ImagePreview imagePreview = findViewById(R.id.imagePreview);
 			sendController = new TextAttachmentController(textInputView,
 					imagePreview, this, viewModel);
-			viewModel.hasImageSupport().observe(this, new Observer<Boolean>() {
-				@Override
-				public void onChanged(@Nullable Boolean hasSupport) {
-					if (hasSupport != null && hasSupport) {
-						// TODO: remove cast when removing feature flag
-						((TextAttachmentController) sendController)
-								.setImagesSupported();
-						viewModel.hasImageSupport().removeObserver(this);
-					}
+			observeOnce(viewModel.getPrivateMessageFormat(), this, format -> {
+				if (format != TEXT_ONLY) {
+					// TODO: remove cast when removing feature flag
+					((TextAttachmentController) sendController)
+							.setImagesSupported();
 				}
 			});
 		} else {
@@ -384,6 +382,12 @@ public class ConversationActivity extends BriarActivity
 		// enable alias action if available
 		observeOnce(viewModel.getContact(), this, contact ->
 				menu.findItem(R.id.action_set_alias).setEnabled(true));
+		// show auto-delete timer setting only, if contacts supports it
+		observeOnce(viewModel.getPrivateMessageFormat(), this, format -> {
+			boolean visible = format == TEXT_IMAGES_AUTO_DELETE;
+			menu.findItem(R.id.action_conversation_settings)
+					.setVisible(visible);
+		});
 
 		return super.onCreateOptionsMenu(menu);
 	}
@@ -405,6 +409,12 @@ public class ConversationActivity extends BriarActivity
 				AliasDialogFragment.newInstance().show(
 						getSupportFragmentManager(), AliasDialogFragment.TAG);
 				return true;
+			case R.id.action_conversation_settings:
+				if (contactId == null) return false;
+				intent = new Intent(this, ConversationSettingsActivity.class);
+				intent.putExtra(CONTACT_ID, contactId.getInt());
+				startActivity(intent);
+				return true;
 			case R.id.action_delete_all_messages:
 				askToDeleteAllMessages();
 				return true;
@@ -657,8 +667,8 @@ public class ConversationActivity extends BriarActivity
 				supportFinishAfterTransition();
 			}
 		} else if (e instanceof ConversationMessageReceivedEvent) {
-			ConversationMessageReceivedEvent p =
-					(ConversationMessageReceivedEvent) e;
+			ConversationMessageReceivedEvent<?> p =
+					(ConversationMessageReceivedEvent<?>) e;
 			if (p.getContactId().equals(contactId)) {
 				LOG.info("Message received, adding");
 				onNewConversationMessage(p.getMessageHeader());
@@ -756,18 +766,10 @@ public class ConversationActivity extends BriarActivity
 			List<AttachmentHeader> attachmentHeaders) {
 		if (isNullOrEmpty(text) && attachmentHeaders.isEmpty())
 			throw new AssertionError();
-		long timestamp = System.currentTimeMillis();
-		timestamp = Math.max(timestamp, getMinTimestampForNewMessage());
-		viewModel.sendMessage(text, attachmentHeaders, timestamp);
+		viewModel.sendMessage(text, attachmentHeaders);
 		textInputView.clearText();
 	}
 
-	private long getMinTimestampForNewMessage() {
-		// Don't use an earlier timestamp than the newest message
-		ConversationItem item = adapter.getLastItem();
-		return item == null ? 0 : item.getTime() + 1;
-	}
-
 	private void onAddedPrivateMessage(@Nullable PrivateMessageHeader h) {
 		if (h == null) return;
 		addConversationItem(h.accept(visitor));
@@ -972,13 +974,11 @@ public class ConversationActivity extends BriarActivity
 			adapter.notifyItemChanged(position, item);
 		}
 		runOnDbThread(() -> {
-			long timestamp = System.currentTimeMillis();
-			timestamp = Math.max(timestamp, getMinTimestampForNewMessage());
 			try {
 				switch (item.getRequestType()) {
 					case INTRODUCTION:
 						respondToIntroductionRequest(item.getSessionId(),
-								accept, timestamp);
+								accept);
 						break;
 					case FORUM:
 						respondToForumRequest(item.getSessionId(), accept);
@@ -1054,9 +1054,8 @@ public class ConversationActivity extends BriarActivity
 
 	@DatabaseExecutor
 	private void respondToIntroductionRequest(SessionId sessionId,
-			boolean accept, long time) throws DbException {
-		introductionManager.respondToIntroduction(contactId, sessionId, time,
-				accept);
+			boolean accept) throws DbException {
+		introductionManager.respondToIntroduction(contactId, sessionId, accept);
 	}
 
 	@DatabaseExecutor

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItem.java

@@ -22,7 +22,7 @@ abstract class ConversationItem {
 	protected String text;
 	private final MessageId id;
 	private final GroupId groupId;
-	private final long time;
+	private final long time, autoDeleteTimer;
 	private final boolean isIncoming;
 	private boolean read, sent, seen;
 
@@ -32,6 +32,7 @@ abstract class ConversationItem {
 		this.id = h.getId();
 		this.groupId = h.getGroupId();
 		this.time = h.getTimestamp();
+		this.autoDeleteTimer = h.getAutoDeleteTimer();
 		this.read = h.isRead();
 		this.sent = h.isSent();
 		this.seen = h.isSeen();
@@ -68,6 +69,10 @@ abstract class ConversationItem {
 		return time;
 	}
 
+	public long getAutoDeleteTimer() {
+		return autoDeleteTimer;
+	}
+
 	/**
 	 * Only useful for incoming messages.
 	 */

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItemViewHolder.java

@@ -12,8 +12,11 @@ import androidx.annotation.UiThread;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.recyclerview.widget.RecyclerView.ViewHolder;
 
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
 import static org.briarproject.bramble.util.StringUtils.trim;
 import static org.briarproject.briar.android.util.UiUtils.formatDate;
+import static org.briarproject.briar.api.autodelete.AutoDeleteConstants.NO_AUTO_DELETE_TIMER;
 
 @UiThread
 @NotNullByDefault
@@ -26,6 +29,7 @@ abstract class ConversationItemViewHolder extends ViewHolder {
 	private final OutItemViewHolder outViewHolder;
 	private final TextView text;
 	protected final TextView time;
+	private final View bomb;
 	@Nullable
 	private String itemKey = null;
 
@@ -38,6 +42,7 @@ abstract class ConversationItemViewHolder extends ViewHolder {
 		layout = v.findViewById(R.id.layout);
 		text = v.findViewById(R.id.text);
 		time = v.findViewById(R.id.time);
+		bomb = v.findViewById(R.id.bomb);
 	}
 
 	@CallSuper
@@ -52,6 +57,9 @@ abstract class ConversationItemViewHolder extends ViewHolder {
 		long timestamp = item.getTime();
 		time.setText(formatDate(time.getContext(), timestamp));
 
+		boolean showBomb = item.getAutoDeleteTimer() != NO_AUTO_DELETE_TIMER;
+		bomb.setVisibility(showBomb ? VISIBLE : GONE);
+
 		if (outViewHolder != null) outViewHolder.bind(item);
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsActivity.java

@@ -0,0 +1,80 @@
+package org.briarproject.briar.android.conversation;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.MenuItem;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.activity.BriarActivity;
+import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import androidx.appcompat.app.ActionBar;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
+import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class ConversationSettingsActivity extends BriarActivity implements
+		BaseFragmentListener {
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private ConversationViewModel viewModel;
+	private ContactId contactId;
+
+	@Override
+	public void onCreate(@Nullable Bundle bundle) {
+		super.onCreate(bundle);
+
+		Intent i = getIntent();
+		int id = i.getIntExtra(CONTACT_ID, -1);
+		if (id == -1) throw new IllegalStateException();
+		contactId = new ContactId(id);
+
+		ActionBar actionBar = getSupportActionBar();
+		if (actionBar != null) {
+			actionBar.setHomeButtonEnabled(true);
+			actionBar.setDisplayHomeAsUpEnabled(true);
+		}
+
+		setContentView(R.layout.activity_conversation_settings);
+
+		viewModel = ViewModelProviders.of(this, viewModelFactory)
+				.get(ConversationViewModel.class);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		// Trigger loading of contact data, noop if data was loaded already.
+		//
+		// We can only start loading data *after* we are sure
+		// the user has signed in. After sign-in, onCreate() isn't run again.
+		if (signedIn()) viewModel.setContactId(contactId);
+	}
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		if (item.getItemId() == android.R.id.home) {
+			onBackPressed();
+			return true;
+		}
+		return false;
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsFragment.java

@@ -0,0 +1,158 @@
+package org.briarproject.briar.android.conversation;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.TransactionManager;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
+
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import androidx.appcompat.widget.SwitchCompat;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.briar.android.util.UiUtils.observeOnce;
+import static org.briarproject.briar.api.autodelete.AutoDeleteConstants.NO_AUTO_DELETE_TIMER;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class ConversationSettingsFragment extends BaseFragment {
+
+	public static final String TAG =
+			ConversationSettingsFragment.class.getName();
+
+	private static final Logger LOG =
+			Logger.getLogger(ConversationSettingsFragment.class.getName());
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+	@Inject
+	@DatabaseExecutor
+	Executor dbExecutor;
+	@Inject
+	TransactionManager db;
+	@Inject
+	AutoDeleteManager autoDeleteManager;
+
+	private ConversationSettingsActivity listener;
+	private ConversationViewModel viewModel;
+	private SwitchCompat switchDisappearingMessages;
+	private volatile boolean disappearingMessages = false;
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+	@Override
+	public void onAttach(Context context) {
+		super.onAttach(context);
+		listener = (ConversationSettingsActivity) context;
+		listener.getActivityComponent().inject(this);
+	}
+
+	@Override
+	public void onCreate(@Nullable Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setHasOptionsMenu(true);
+	}
+
+	@Override
+	public View onCreateView(LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		View contentView =
+				inflater.inflate(R.layout.fragment_conversation_settings,
+						container, false);
+
+		switchDisappearingMessages =
+				contentView.findViewById(R.id.switchDisappearingMessages);
+
+		switchDisappearingMessages
+				.setOnCheckedChangeListener((button, value) -> viewModel
+						.setAutoDeleteTimerEnabled(value));
+
+		TextView buttonLearnMore =
+				contentView.findViewById(R.id.buttonLearnMore);
+		buttonLearnMore.setOnClickListener(e -> showLearnMoreDialog());
+
+		viewModel = ViewModelProviders.of(requireActivity(), viewModelFactory)
+				.get(ConversationViewModel.class);
+
+		return contentView;
+	}
+
+	@Override
+	public void onStart() {
+		super.onStart();
+		switchDisappearingMessages.setEnabled(false);
+		loadSettings();
+	}
+
+	private void loadSettings() {
+		observeOnce(viewModel.getContact(), this, c -> {
+			dbExecutor.execute(() -> {
+				try {
+					db.transaction(false, txn -> {
+						long timer = autoDeleteManager
+								.getAutoDeleteTimer(txn, c.getId());
+						disappearingMessages = timer != NO_AUTO_DELETE_TIMER;
+					});
+					listener.runOnUiThreadUnlessDestroyed(
+							this::displaySettings);
+				} catch (DbException e) {
+					logException(LOG, WARNING, e);
+				}
+			});
+		});
+	}
+
+	private void displaySettings() {
+		switchDisappearingMessages.setChecked(disappearingMessages);
+		switchDisappearingMessages.setEnabled(true);
+	}
+
+	@Override
+	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+		inflater.inflate(R.menu.help_action, menu);
+		super.onCreateOptionsMenu(menu, inflater);
+	}
+
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		if (item.getItemId() == R.id.action_help) {
+			showLearnMoreDialog();
+			return true;
+		}
+		return super.onOptionsItemSelected(item);
+	}
+
+	private void showLearnMoreDialog() {
+		ConversationSettingsLearnMoreDialog
+				dialog = new ConversationSettingsLearnMoreDialog();
+		dialog.show(requireActivity().getSupportFragmentManager(),
+				ConversationSettingsLearnMoreDialog.TAG);
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsLearnMoreDialog.java

@@ -0,0 +1,44 @@
+package org.briarproject.briar.android.conversation;
+
+import android.app.Dialog;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.briar.R;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.FragmentActivity;
+
+@MethodsNotNullByDefault
+public class ConversationSettingsLearnMoreDialog extends DialogFragment {
+
+	final static String TAG =
+			ConversationSettingsLearnMoreDialog.class.getName();
+
+	static ConversationSettingsLearnMoreDialog newInstance() {
+		return new ConversationSettingsLearnMoreDialog();
+	}
+
+	@Override
+	public Dialog onCreateDialog(Bundle savedInstanceState) {
+		FragmentActivity activity = requireActivity();
+
+		AlertDialog.Builder builder =
+				new AlertDialog.Builder(activity, R.style.BriarDialogTheme);
+
+		LayoutInflater inflater = LayoutInflater.from(getContext());
+		View view = inflater.inflate(
+				R.layout.fragment_conversation_settings_learn_more, null);
+		builder.setView(view);
+
+		builder.setTitle(R.string.disappearing_messages_title);
+		builder.setNeutralButton(R.string.ok, null);
+
+		return builder.create();
+	}
+
+
+}

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationViewModel.java

@@ -10,6 +10,7 @@ import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchContactException;
+import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
@@ -28,10 +29,13 @@ import org.briarproject.briar.android.attachment.AttachmentRetriever;
 import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
+import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.messaging.AttachmentHeader;
 import org.briarproject.briar.api.messaging.MessagingManager;
 import org.briarproject.briar.api.messaging.PrivateMessage;
 import org.briarproject.briar.api.messaging.PrivateMessageFactory;
+import org.briarproject.briar.api.messaging.PrivateMessageFormat;
 import org.briarproject.briar.api.messaging.PrivateMessageHeader;
 import org.briarproject.briar.api.messaging.event.AttachmentReceivedEvent;
 
@@ -50,6 +54,7 @@ import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.Transformations;
 
 import static java.util.Objects.requireNonNull;
+import static java.util.concurrent.TimeUnit.DAYS;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
@@ -57,12 +62,15 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
 import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_NAMESPACE;
 import static org.briarproject.briar.android.util.UiUtils.observeForeverOnce;
+import static org.briarproject.briar.api.autodelete.AutoDeleteConstants.NO_AUTO_DELETE_TIMER;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_IMAGES;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_ONLY;
 
 @NotNullByDefault
 public class ConversationViewModel extends AndroidViewModel
 		implements EventListener, AttachmentManager {
 
-	private static Logger LOG =
+	private static final Logger LOG =
 			getLogger(ConversationViewModel.class.getName());
 
 	private static final String SHOW_ONBOARDING_IMAGE =
@@ -80,6 +88,8 @@ public class ConversationViewModel extends AndroidViewModel
 	private final PrivateMessageFactory privateMessageFactory;
 	private final AttachmentRetriever attachmentRetriever;
 	private final AttachmentCreator attachmentCreator;
+	private final AutoDeleteManager autoDeleteManager;
+	private final ConversationManager conversationManager;
 
 	@Nullable
 	private ContactId contactId = null;
@@ -89,7 +99,7 @@ public class ConversationViewModel extends AndroidViewModel
 	private final LiveData<String> contactName =
 			Transformations.map(contact, UiUtils::getContactDisplayName);
 	private final LiveData<GroupId> messagingGroupId;
-	private final MutableLiveData<Boolean> imageSupport =
+	private final MutableLiveData<PrivateMessageFormat> privateMessageFormat =
 			new MutableLiveData<>();
 	private final MutableLiveEvent<Boolean> showImageOnboarding =
 			new MutableLiveEvent<>();
@@ -112,7 +122,9 @@ public class ConversationViewModel extends AndroidViewModel
 			SettingsManager settingsManager,
 			PrivateMessageFactory privateMessageFactory,
 			AttachmentRetriever attachmentRetriever,
-			AttachmentCreator attachmentCreator) {
+			AttachmentCreator attachmentCreator,
+			AutoDeleteManager autoDeleteManager,
+			ConversationManager conversationManager) {
 		super(application);
 		this.dbExecutor = dbExecutor;
 		this.db = db;
@@ -123,6 +135,8 @@ public class ConversationViewModel extends AndroidViewModel
 		this.privateMessageFactory = privateMessageFactory;
 		this.attachmentRetriever = attachmentRetriever;
 		this.attachmentCreator = attachmentCreator;
+		this.autoDeleteManager = autoDeleteManager;
+		this.conversationManager = conversationManager;
 		messagingGroupId = Transformations
 				.map(contact, c -> messagingManager.getContactGroup(c).getId());
 		contactDeleted.setValue(false);
@@ -205,16 +219,13 @@ public class ConversationViewModel extends AndroidViewModel
 	}
 
 	@UiThread
-	void sendMessage(@Nullable String text,
-			List<AttachmentHeader> headers, long timestamp) {
+	void sendMessage(@Nullable String text, List<AttachmentHeader> headers) {
 		// messagingGroupId is loaded with the contact
 		observeForeverOnce(messagingGroupId, groupId -> {
 			requireNonNull(groupId);
-			observeForeverOnce(imageSupport, hasImageSupport -> {
-				requireNonNull(hasImageSupport);
-				createMessage(groupId, text, headers, timestamp,
-						hasImageSupport);
-			});
+			observeForeverOnce(privateMessageFormat, format ->
+					storeMessage(requireNonNull(contactId), groupId, text,
+							headers, format));
 		});
 	}
 
@@ -244,10 +255,10 @@ public class ConversationViewModel extends AndroidViewModel
 
 	@DatabaseExecutor
 	private void checkFeaturesAndOnboarding(ContactId c) throws DbException {
-		// check if images are supported
-		boolean imagesSupported = db.transactionWithResult(true, txn ->
-				messagingManager.contactSupportsImages(txn, c));
-		imageSupport.postValue(imagesSupported);
+		// check if images and auto-deletion are supported
+		PrivateMessageFormat format = db.transactionWithResult(true, txn ->
+				messagingManager.getContactMessageFormat(txn, c));
+		privateMessageFormat.postValue(format);
 
 		// check if introductions are supported
 		Collection<Contact> contacts = contactManager.getContacts();
@@ -256,7 +267,7 @@ public class ConversationViewModel extends AndroidViewModel
 
 		// we only show one onboarding dialog at a time
 		Settings settings = settingsManager.getSettings(SETTINGS_NAMESPACE);
-		if (imagesSupported &&
+		if (format != TEXT_ONLY &&
 				settings.getBoolean(SHOW_ONBOARDING_IMAGE, true)) {
 			onOnboardingShown(SHOW_ONBOARDING_IMAGE);
 			showImageOnboarding.postEvent(true);
@@ -274,40 +285,67 @@ public class ConversationViewModel extends AndroidViewModel
 		settingsManager.mergeSettings(settings, SETTINGS_NAMESPACE);
 	}
 
-	@UiThread
-	private void createMessage(GroupId groupId, @Nullable String text,
-			List<AttachmentHeader> headers, long timestamp,
-			boolean hasImageSupport) {
+	private PrivateMessage createMessage(Transaction txn, ContactId c,
+			GroupId groupId, @Nullable String text,
+			List<AttachmentHeader> headers, PrivateMessageFormat format)
+			throws DbException {
+		long timestamp =
+				conversationManager.getTimestampForOutgoingMessage(txn, c);
 		try {
-			PrivateMessage pm;
-			if (hasImageSupport) {
-				pm = privateMessageFactory.createPrivateMessage(groupId,
+			if (format == TEXT_ONLY) {
+				return privateMessageFactory.createLegacyPrivateMessage(
+						groupId, timestamp, requireNonNull(text));
+			} else if (format == TEXT_IMAGES) {
+				return privateMessageFactory.createPrivateMessage(groupId,
 						timestamp, text, headers);
 			} else {
-				pm = privateMessageFactory.createLegacyPrivateMessage(
-						groupId, timestamp, requireNonNull(text));
+				long timer = autoDeleteManager.getAutoDeleteTimer(txn, c,
+						timestamp);
+				return privateMessageFactory.createPrivateMessage(groupId,
+						timestamp, text, headers, timer);
 			}
-			storeMessage(pm);
 		} catch (FormatException e) {
 			throw new AssertionError(e);
 		}
 	}
 
 	@UiThread
-	private void storeMessage(PrivateMessage m) {
-		attachmentCreator.onAttachmentsSent(m.getMessage().getId());
+	private void storeMessage(ContactId c, GroupId groupId,
+			@Nullable String text, List<AttachmentHeader> headers,
+			PrivateMessageFormat format) {
 		dbExecutor.execute(() -> {
 			try {
-				long start = now();
-				messagingManager.addLocalMessage(m);
-				logDuration(LOG, "Storing message", start);
-				Message message = m.getMessage();
-				PrivateMessageHeader h = new PrivateMessageHeader(
-						message.getId(), message.getGroupId(),
-						message.getTimestamp(), true, true, false, false,
-						m.hasText(), m.getAttachmentHeaders());
-				// TODO add text to cache when available here
-				addedHeader.postEvent(h);
+				db.transaction(false, txn -> {
+					long start = now();
+					PrivateMessage m = createMessage(txn, c, groupId, text,
+							headers, format);
+					messagingManager.addLocalMessage(txn, m);
+					logDuration(LOG, "Storing message", start);
+					Message message = m.getMessage();
+					PrivateMessageHeader h = new PrivateMessageHeader(
+							message.getId(), message.getGroupId(),
+							message.getTimestamp(), true, true, false, false,
+							m.hasText(), m.getAttachmentHeaders(),
+							m.getAutoDeleteTimer());
+					// TODO add text to cache when available here
+					MessageId id = message.getId();
+					txn.attach(() -> attachmentCreator.onAttachmentsSent(id));
+					addedHeader.postEvent(h);
+				});
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
+	void setAutoDeleteTimerEnabled(boolean enabled) {
+		final long timer = enabled ? DAYS.toMillis(7) : NO_AUTO_DELETE_TIMER;
+		// ContactId is set before menu gets inflated and UI interaction
+		final ContactId c = requireNonNull(contactId);
+		dbExecutor.execute(() -> {
+			try {
+				db.transaction(false, txn ->
+						autoDeleteManager.setAutoDeleteTimer(txn, c, timer));
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
 			}
@@ -330,8 +368,8 @@ public class ConversationViewModel extends AndroidViewModel
 		return contactName;
 	}
 
-	LiveData<Boolean> hasImageSupport() {
-		return imageSupport;
+	LiveData<PrivateMessageFormat> getPrivateMessageFormat() {
+		return privateMessageFormat;
 	}
 
 	LiveEvent<Boolean> showImageOnboarding() {

briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageFragment.java

@@ -27,6 +27,7 @@ import javax.inject.Inject;
 import androidx.annotation.DrawableRes;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -78,7 +79,7 @@ public class ImageFragment extends Fragment
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		attachment = requireNonNull(args.getParcelable(ATTACHMENT_POSITION));
 		isFirst = args.getBoolean(IS_FIRST);
 		conversationItemId =
@@ -93,7 +94,7 @@ public class ImageFragment extends Fragment
 		View v = inflater.inflate(R.layout.fragment_image, container,
 				false);
 
-		viewModel = ViewModelProviders.of(requireNonNull(getActivity()),
+		viewModel = ViewModelProviders.of(requireActivity(),
 				viewModelFactory).get(ImageViewModel.class);
 
 		photoView = v.findViewById(R.id.photoView);
@@ -110,8 +111,9 @@ public class ImageFragment extends Fragment
 			photoView.setImageResource(R.drawable.ic_image_missing);
 			startPostponedTransition();
 			// state is not final, so observe state changes
+			LifecycleOwner owner = getViewLifecycleOwner();
 			viewModel.getOnAttachmentReceived(attachment.getMessageId())
-					.observeEvent(this, this::onAttachmentReceived);
+					.observeEvent(owner, this::onAttachmentReceived);
 		}
 
 		return v;

briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListFragment.java

@@ -47,7 +47,6 @@ import androidx.annotation.UiThread;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
 import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -95,7 +94,7 @@ public class ForumListFragment extends BaseEventFragment implements
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 
-		requireNonNull(getActivity()).setTitle(R.string.forums_button);
+		requireActivity().setTitle(R.string.forums_button);
 
 		View contentView =
 				inflater.inflate(R.layout.fragment_forum_list, container,

briar-android/src/main/java/org/briarproject/briar/android/introduction/ContactChooserFragment.java

@@ -32,7 +32,6 @@ import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
@@ -84,7 +83,7 @@ public class ContactChooserFragment extends BaseFragment {
 					Contact c2 = item.getContact();
 					showMessageScreen(c1, c2);
 				};
-		adapter = new ContactListAdapter(requireNonNull(getActivity()),
+		adapter = new ContactListAdapter(requireActivity(),
 				onContactClickListener);
 
 		list = contentView.findViewById(R.id.list);
@@ -92,8 +91,7 @@ public class ContactChooserFragment extends BaseFragment {
 		list.setAdapter(adapter);
 		list.setEmptyText(R.string.no_contacts);
 
-		contactId = new ContactId(
-				requireNonNull(getArguments()).getInt(CONTACT_ID));
+		contactId = new ContactId(requireArguments().getInt(CONTACT_ID));
 
 		return contentView;
 	}

briar-android/src/main/java/org/briarproject/briar/android/introduction/IntroductionMessageFragment.java

@@ -39,7 +39,6 @@ import static android.app.Activity.RESULT_OK;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static android.widget.Toast.LENGTH_SHORT;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.util.UiUtils.getContactDisplayName;
@@ -102,7 +101,7 @@ public class IntroductionMessageFragment extends BaseFragment
 		}
 
 		// get contact IDs from fragment arguments
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		int contactId1 = args.getInt(CONTACT_ID_1, -1);
 		int contactId2 = args.getInt(CONTACT_ID_2, -1);
 		if (contactId1 == -1 || contactId2 == -1) {
@@ -212,8 +211,7 @@ public class IntroductionMessageFragment extends BaseFragment
 		introductionActivity.runOnDbThread(() -> {
 			// actually make the introduction
 			try {
-				long timestamp = System.currentTimeMillis();
-				introductionManager.makeIntroduction(c1, c2, text, timestamp);
+				introductionManager.makeIntroduction(c1, c2, text);
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
 				introductionError();

briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementFragment.java

@@ -54,7 +54,6 @@ import static android.view.View.VISIBLE;
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.widget.LinearLayout.HORIZONTAL;
 import static android.widget.Toast.LENGTH_LONG;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -67,6 +66,7 @@ public class KeyAgreementFragment extends BaseEventFragment
 	static final String TAG = KeyAgreementFragment.class.getName();
 
 	private static final Logger LOG = Logger.getLogger(TAG);
+	@SuppressWarnings("CharsetObjectCanBeUsed") // Requires minSdkVersion >= 19
 	private static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
 
 	@Inject
@@ -138,8 +138,7 @@ public class KeyAgreementFragment extends BaseEventFragment
 	@Override
 	public void onActivityCreated(@Nullable Bundle savedInstanceState) {
 		super.onActivityCreated(savedInstanceState);
-		requireNonNull(getActivity())
-				.setRequestedOrientation(SCREEN_ORIENTATION_NOSENSOR);
+		requireActivity().setRequestedOrientation(SCREEN_ORIENTATION_NOSENSOR);
 		cameraView.setPreviewConsumer(new QrCodeDecoder(this));
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/login/OpenDatabaseFragment.java

@@ -16,6 +16,7 @@ import org.briarproject.briar.android.fragment.BaseFragment;
 import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -51,7 +52,8 @@ public class OpenDatabaseFragment extends BaseFragment {
 
 		StartupViewModel viewModel = ViewModelProviders.of(requireActivity(),
 				viewModelFactory).get(StartupViewModel.class);
-		viewModel.getState().observe(this, this::onStateChanged);
+		LifecycleOwner owner = getViewLifecycleOwner();
+		viewModel.getState().observe(owner, this::onStateChanged);
 
 		return v;
 	}

briar-android/src/main/java/org/briarproject/briar/android/login/PasswordFragment.java

@@ -23,6 +23,7 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import androidx.appcompat.app.AlertDialog;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -67,7 +68,8 @@ public class PasswordFragment extends BaseFragment implements TextWatcher {
 		viewModel = ViewModelProviders.of(requireActivity(), viewModelFactory)
 				.get(StartupViewModel.class);
 
-		viewModel.getPasswordValidated().observeEvent(this, result -> {
+		LifecycleOwner owner = getViewLifecycleOwner();
+		viewModel.getPasswordValidated().observeEvent(owner, result -> {
 			if (result != SUCCESS) onPasswordInvalid(result);
 		});
 

briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupControllerImpl.java

@@ -7,6 +7,8 @@ import org.briarproject.bramble.api.crypto.CryptoExecutor;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchContactException;
+import org.briarproject.bramble.api.db.Transaction;
+import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
@@ -15,6 +17,8 @@ import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.briar.android.contactselection.ContactSelectorControllerImpl;
 import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
+import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.privategroup.GroupMessage;
 import org.briarproject.briar.api.privategroup.GroupMessageFactory;
 import org.briarproject.briar.api.privategroup.PrivateGroup;
@@ -35,6 +39,8 @@ import javax.inject.Inject;
 import androidx.annotation.Nullable;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
@@ -43,9 +49,12 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 		implements CreateGroupController {
 
 	private static final Logger LOG =
-			Logger.getLogger(CreateGroupControllerImpl.class.getName());
+			getLogger(CreateGroupControllerImpl.class.getName());
 
 	private final Executor cryptoExecutor;
+	private final TransactionManager db;
+	private final AutoDeleteManager autoDeleteManager;
+	private final ConversationManager conversationManager;
 	private final ContactManager contactManager;
 	private final IdentityManager identityManager;
 	private final PrivateGroupFactory groupFactory;
@@ -56,16 +65,26 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 	private final Clock clock;
 
 	@Inject
-	CreateGroupControllerImpl(@DatabaseExecutor Executor dbExecutor,
+	CreateGroupControllerImpl(
+			@DatabaseExecutor Executor dbExecutor,
 			@CryptoExecutor Executor cryptoExecutor,
-			LifecycleManager lifecycleManager, ContactManager contactManager,
-			IdentityManager identityManager, PrivateGroupFactory groupFactory,
+			TransactionManager db,
+			AutoDeleteManager autoDeleteManager,
+			ConversationManager conversationManager,
+			LifecycleManager lifecycleManager,
+			ContactManager contactManager,
+			IdentityManager identityManager,
+			PrivateGroupFactory groupFactory,
 			GroupMessageFactory groupMessageFactory,
 			PrivateGroupManager groupManager,
 			GroupInvitationFactory groupInvitationFactory,
-			GroupInvitationManager groupInvitationManager, Clock clock) {
+			GroupInvitationManager groupInvitationManager,
+			Clock clock) {
 		super(dbExecutor, lifecycleManager, contactManager);
 		this.cryptoExecutor = cryptoExecutor;
+		this.db = db;
+		this.autoDeleteManager = autoDeleteManager;
+		this.conversationManager = conversationManager;
 		this.contactManager = contactManager;
 		this.identityManager = identityManager;
 		this.groupFactory = groupFactory;
@@ -129,16 +148,14 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 			ResultExceptionHandler<Void, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				LocalAuthor localAuthor = identityManager.getLocalAuthor();
-				List<Contact> contacts = new ArrayList<>();
-				for (ContactId c : contactIds) {
-					try {
-						contacts.add(contactManager.getContact(c));
-					} catch (NoSuchContactException e) {
-						// Continue
-					}
-				}
-				signInvitations(g, localAuthor, contacts, text, handler);
+				db.transaction(true, txn -> {
+					LocalAuthor localAuthor =
+							identityManager.getLocalAuthor(txn);
+					List<InvitationContext> contexts =
+							createInvitationContexts(txn, contactIds);
+					txn.attach(() -> signInvitations(g, localAuthor, contexts,
+							text, handler));
+				});
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
 				handler.onException(e);
@@ -146,17 +163,32 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 		});
 	}
 
+	private List<InvitationContext> createInvitationContexts(Transaction txn,
+			Collection<ContactId> contactIds) throws DbException {
+		List<InvitationContext> contexts = new ArrayList<>();
+		for (ContactId c : contactIds) {
+			try {
+				Contact contact = contactManager.getContact(txn, c);
+				long timestamp = conversationManager
+						.getTimestampForOutgoingMessage(txn, c);
+				long timer = autoDeleteManager.getAutoDeleteTimer(txn, c,
+						timestamp);
+				contexts.add(new InvitationContext(contact, timestamp, timer));
+			} catch (NoSuchContactException e) {
+				// Continue
+			}
+		}
+		return contexts;
+	}
+
 	private void signInvitations(GroupId g, LocalAuthor localAuthor,
-			Collection<Contact> contacts, @Nullable String text,
+			List<InvitationContext> contexts, @Nullable String text,
 			ResultExceptionHandler<Void, DbException> handler) {
 		cryptoExecutor.execute(() -> {
-			long timestamp = clock.currentTimeMillis();
-			List<InvitationContext> contexts = new ArrayList<>();
-			for (Contact c : contacts) {
-				byte[] signature = groupInvitationFactory.signInvitation(c, g,
-						timestamp, localAuthor.getPrivateKey());
-				contexts.add(new InvitationContext(c.getId(), timestamp,
-						signature));
+			for (InvitationContext ctx : contexts) {
+				ctx.signature = groupInvitationFactory.signInvitation(
+						ctx.contact, g, ctx.timestamp,
+						localAuthor.getPrivateKey());
 			}
 			sendInvitations(g, contexts, text, handler);
 		});
@@ -167,16 +199,16 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 			ResultExceptionHandler<Void, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				for (InvitationContext context : contexts) {
+				for (InvitationContext ctx : contexts) {
 					try {
 						groupInvitationManager.sendInvitation(g,
-								context.contactId, text, context.timestamp,
-								context.signature);
+								ctx.contact.getId(), text, ctx.timestamp,
+								requireNonNull(ctx.signature),
+								ctx.autoDeleteTimer);
 					} catch (NoSuchContactException e) {
 						// Continue
 					}
 				}
-				//noinspection ConstantConditions
 				handler.onResult(null);
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
@@ -187,15 +219,16 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 
 	private static class InvitationContext {
 
-		private final ContactId contactId;
-		private final long timestamp;
-		private final byte[] signature;
+		private final Contact contact;
+		private final long timestamp, autoDeleteTimer;
+		@Nullable
+		private byte[] signature = null;
 
-		private InvitationContext(ContactId contactId, long timestamp,
-				byte[] signature) {
-			this.contactId = contactId;
+		private InvitationContext(Contact contact, long timestamp,
+				long autoDeleteTimer) {
+			this.contact = contact;
 			this.timestamp = timestamp;
-			this.signature = signature;
+			this.autoDeleteTimer = autoDeleteTimer;
 		}
 	}
 }

briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/GroupInviteFragment.java

@@ -15,7 +15,6 @@ import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
 
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 
 @MethodsNotNullByDefault
@@ -43,7 +42,7 @@ public class GroupInviteFragment extends ContactSelectorFragment {
 	@Override
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
-		requireNonNull(getActivity()).setTitle(R.string.groups_invite_members);
+		requireActivity().setTitle(R.string.groups_invite_members);
 	}
 
 	@Override

briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListFragment.java

@@ -39,7 +39,6 @@ import androidx.annotation.UiThread;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
 import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
-import static java.util.Objects.requireNonNull;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -72,7 +71,7 @@ public class GroupListFragment extends BaseFragment implements
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 
-		requireNonNull(getActivity()).setTitle(R.string.groups_button);
+		requireActivity().setTitle(R.string.groups_button);
 
 		View v = inflater.inflate(R.layout.list, container, false);
 

briar-android/src/main/java/org/briarproject/briar/android/reporting/CrashFragment.java

@@ -12,8 +12,6 @@ import org.briarproject.briar.R;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 
-import static java.util.Objects.requireNonNull;
-
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class CrashFragment extends Fragment {
@@ -35,7 +33,7 @@ public class CrashFragment extends Fragment {
 	}
 
 	private DevReportActivity getDevReportActivity() {
-		return (DevReportActivity) requireNonNull(getActivity());
+		return (DevReportActivity) requireActivity();
 	}
 
 }

briar-android/src/main/java/org/briarproject/briar/android/reporting/ReportFormFragment.java

@@ -113,7 +113,7 @@ public class ReportFormFragment extends Fragment
 		report = v.findViewById(R.id.report_content);
 		progress = v.findViewById(R.id.progress_wheel);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		isFeedback = args.getBoolean(IS_FEEDBACK);
 		reportFile =
 				(File) requireNonNull(args.getSerializable(EXTRA_REPORT_FILE));
@@ -285,7 +285,7 @@ public class ReportFormFragment extends Fragment
 	}
 
 	private DevReportActivity getDevReportActivity() {
-		return (DevReportActivity) requireNonNull(getActivity());
+		return (DevReportActivity) requireActivity();
 	}
 
 }

briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareBlogControllerImpl.java

@@ -10,11 +10,9 @@ import org.briarproject.bramble.api.db.NoSuchGroupException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.briar.android.contactselection.ContactSelectorControllerImpl;
 import org.briarproject.briar.android.controller.handler.ExceptionHandler;
 import org.briarproject.briar.api.blog.BlogSharingManager;
-import org.briarproject.briar.api.conversation.ConversationManager;
 
 import java.util.Collection;
 import java.util.concurrent.Executor;
@@ -25,6 +23,7 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
@@ -33,21 +32,16 @@ class ShareBlogControllerImpl extends ContactSelectorControllerImpl
 		implements ShareBlogController {
 
 	private final static Logger LOG =
-			Logger.getLogger(ShareBlogControllerImpl.class.getName());
+			getLogger(ShareBlogControllerImpl.class.getName());
 
-	private final ConversationManager conversationManager;
 	private final BlogSharingManager blogSharingManager;
-	private final Clock clock;
 
 	@Inject
 	ShareBlogControllerImpl(@DatabaseExecutor Executor dbExecutor,
 			LifecycleManager lifecycleManager, ContactManager contactManager,
-			ConversationManager conversationManager,
-			BlogSharingManager blogSharingManager, Clock clock) {
+			BlogSharingManager blogSharingManager) {
 		super(dbExecutor, lifecycleManager, contactManager);
-		this.conversationManager = conversationManager;
 		this.blogSharingManager = blogSharingManager;
-		this.clock = clock;
 	}
 
 	@Override
@@ -62,10 +56,7 @@ class ShareBlogControllerImpl extends ContactSelectorControllerImpl
 			try {
 				for (ContactId c : contacts) {
 					try {
-						long time = Math.max(clock.currentTimeMillis(),
-								conversationManager.getGroupCount(c)
-										.getLatestMsgTime() + 1);
-						blogSharingManager.sendInvitation(g, c, text, time);
+						blogSharingManager.sendInvitation(g, c, text);
 					} catch (NoSuchContactException | NoSuchGroupException e) {
 						logException(LOG, WARNING, e);
 					}

briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareForumControllerImpl.java

@@ -10,10 +10,8 @@ import org.briarproject.bramble.api.db.NoSuchGroupException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.briar.android.contactselection.ContactSelectorControllerImpl;
 import org.briarproject.briar.android.controller.handler.ExceptionHandler;
-import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.forum.ForumSharingManager;
 
 import java.util.Collection;
@@ -25,6 +23,7 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
@@ -33,21 +32,16 @@ class ShareForumControllerImpl extends ContactSelectorControllerImpl
 		implements ShareForumController {
 
 	private final static Logger LOG =
-			Logger.getLogger(ShareForumControllerImpl.class.getName());
+			getLogger(ShareForumControllerImpl.class.getName());
 
-	private final ConversationManager conversationManager;
 	private final ForumSharingManager forumSharingManager;
-	private final Clock clock;
 
 	@Inject
 	ShareForumControllerImpl(@DatabaseExecutor Executor dbExecutor,
 			LifecycleManager lifecycleManager, ContactManager contactManager,
-			ConversationManager conversationManager,
-			ForumSharingManager forumSharingManager, Clock clock) {
+			ForumSharingManager forumSharingManager) {
 		super(dbExecutor, lifecycleManager, contactManager);
-		this.conversationManager = conversationManager;
 		this.forumSharingManager = forumSharingManager;
-		this.clock = clock;
 	}
 
 	@Override
@@ -62,10 +56,7 @@ class ShareForumControllerImpl extends ContactSelectorControllerImpl
 			try {
 				for (ContactId c : contacts) {
 					try {
-						long time = Math.max(clock.currentTimeMillis(),
-								conversationManager.getGroupCount(c)
-										.getLatestMsgTime() + 1);
-						forumSharingManager.sendInvitation(g, c, text, time);
+						forumSharingManager.sendInvitation(g, c, text);
 					} catch (NoSuchContactException | NoSuchGroupException e) {
 						logException(LOG, WARNING, e);
 					}

briar-android/src/main/java/org/briarproject/briar/android/util/BriarNotificationBuilder.java

@@ -11,11 +11,13 @@ import androidx.core.content.ContextCompat;
 import static android.os.Build.VERSION.SDK_INT;
 import static androidx.core.app.NotificationCompat.VISIBILITY_PRIVATE;
 
-
 public class BriarNotificationBuilder extends NotificationCompat.Builder {
 
+	private final Context context;
+
 	public BriarNotificationBuilder(Context context, String channelId) {
 		super(context, channelId);
+		this.context = context;
 		// Auto-cancel does not fire the delete intent, see
 		// https://issuetracker.google.com/issues/36961721
 		setAutoCancel(true);
@@ -26,7 +28,7 @@ public class BriarNotificationBuilder extends NotificationCompat.Builder {
 	}
 
 	public BriarNotificationBuilder setColorRes(@ColorRes int res) {
-		setColor(ContextCompat.getColor(mContext, res));
+		setColor(ContextCompat.getColor(context, res));
 		return this;
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/widget/LinkDialogFragment.java

@@ -49,7 +49,7 @@ public class LinkDialogFragment extends DialogFragment {
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		url = requireNonNull(args.getString("url"));
 
 		setStyle(STYLE_NO_TITLE, R.style.BriarDialogTheme);
@@ -70,7 +70,7 @@ public class LinkDialogFragment extends DialogFragment {
 		Context ctx = requireContext();
 		Intent i = new Intent(ACTION_VIEW, Uri.parse(url));
 		PackageManager packageManager = ctx.getPackageManager();
-		List activities =
+		List<?> activities =
 				packageManager.queryIntentActivities(i, MATCH_DEFAULT_ONLY);
 		boolean choice = activities.size() > 1;
 		Intent intent = choice ? Intent.createChooser(i,

briar-android/src/main/res/drawable/ic_bomb.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="16dp"
+	android:height="16dp"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#FFFFFF"
+		android:pathData="M11.25,6A3.25,3.25 0 0,1 14.5,2.75A3.25,3.25 0 0,1 17.75,6C17.75,6.42 18.08,6.75 18.5,6.75C18.92,6.75 19.25,6.42 19.25,6V5.25H20.75V6A2.25,2.25 0 0,1 18.5,8.25A2.25,2.25 0 0,1 16.25,6A1.75,1.75 0 0,0 14.5,4.25A1.75,1.75 0 0,0 12.75,6H14V7.29C16.89,8.15 19,10.83 19,14A7,7 0 0,1 12,21A7,7 0 0,1 5,14C5,10.83 7.11,8.15 10,7.29V6H11.25M22,6H24V7H22V6M19,4V2H20V4H19M20.91,4.38L22.33,2.96L23.04,3.67L21.62,5.09L20.91,4.38Z" />
+</vector>

briar-android/src/main/res/layout-land/fragment_keyagreement_id.xml

@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	android:id="@+id/scrollView"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/scrollView"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:orientation="vertical">
@@ -22,12 +21,12 @@
 			android:padding="@dimen/margin_medium"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_intro"
-			android:tint="@color/color_primary"
 			app:layout_constraintBottom_toBottomOf="@id/explanationText"
 			app:layout_constraintEnd_toStartOf="@id/explanationText"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:ignore="ContentDescription"/>
+			app:tint="@color/color_primary"
+			tools:ignore="ContentDescription" />
 
 		<ImageView
 			android:id="@+id/explanationImage"
@@ -35,16 +34,16 @@
 			android:layout_height="wrap_content"
 			android:layout_weight="1"
 			android:adjustViewBounds="true"
-			android:paddingEnd="@dimen/margin_large"
 			android:paddingStart="@dimen/margin_large"
 			android:paddingTop="@dimen/margin_large"
+			android:paddingEnd="@dimen/margin_large"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_explanation"
 			app:layout_constraintBottom_toTopOf="@id/explanationText"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@id/diagram"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:ignore="ContentDescription"/>
+			tools:ignore="ContentDescription" />
 
 		<TextView
 			android:id="@+id/explanationText"
@@ -55,7 +54,7 @@
 			android:text="@string/face_to_face"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@id/diagram"
-			app:layout_constraintTop_toBottomOf="@id/explanationImage"/>
+			app:layout_constraintTop_toBottomOf="@id/explanationImage" />
 
 		<View
 			android:id="@+id/explanationBorder"
@@ -65,14 +64,14 @@
 			app:layout_constraintBottom_toBottomOf="@id/explanationText"
 			app:layout_constraintEnd_toEndOf="@id/explanationImage"
 			app:layout_constraintStart_toStartOf="@id/explanationImage"
-			app:layout_constraintTop_toTopOf="@id/explanationImage"/>
+			app:layout_constraintTop_toTopOf="@id/explanationImage" />
 
 		<androidx.constraintlayout.widget.Barrier
 			android:id="@+id/barrier"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			app:barrierDirection="bottom"
-			app:constraint_referenced_ids="diagram,explanationBorder"/>
+			app:constraint_referenced_ids="diagram,explanationBorder" />
 
 		<Button
 			android:id="@+id/continueButton"
@@ -83,7 +82,7 @@
 			android:layout_marginTop="@dimen/margin_medium"
 			android:text="@string/continue_button"
 			app:layout_constraintBottom_toBottomOf="parent"
-			app:layout_constraintTop_toBottomOf="@id/barrier"/>
+			app:layout_constraintTop_toBottomOf="@id/barrier" />
 
 	</androidx.constraintlayout.widget.ConstraintLayout>
 

briar-android/src/main/res/layout/activity_conversation_settings.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent">
+
+	<fragment
+		android:id="@+id/fragment"
+		android:name="org.briarproject.briar.android.conversation.ConversationSettingsFragment"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent" />
+</FrameLayout>

briar-android/src/main/res/layout/activity_nav_drawer.xml

@@ -53,10 +53,10 @@
 				android:contentDescription="@string/close"
 				android:scaleType="center"
 				android:src="@drawable/ic_close"
-				android:tint="@color/briar_text_tertiary_inverse"
 				app:layout_constraintBottom_toBottomOf="parent"
 				app:layout_constraintEnd_toEndOf="parent"
-				app:layout_constraintTop_toTopOf="parent" />
+				app:layout_constraintTop_toTopOf="parent"
+				app:tint="@color/briar_text_tertiary_inverse" />
 
 		</androidx.constraintlayout.widget.ConstraintLayout>
 

briar-android/src/main/res/layout/fragment_conversation_settings.xml

@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:paddingHorizontal="@dimen/margin_large">
+
+	<androidx.constraintlayout.widget.ConstraintLayout
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content">
+
+		<ImageView
+			android:id="@+id/imageViewBomb"
+			android:layout_width="64dp"
+			android:layout_height="64dp"
+			android:layout_marginTop="16dp"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toTopOf="parent"
+			app:tint="?attr/colorControlNormal" />
+
+		<TextView
+			android:id="@+id/buttonLearnMore"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginTop="@dimen/margin_large"
+			android:clickable="true"
+			android:focusable="true"
+			android:text="@string/learn_more"
+			android:textColor="?android:attr/textColorLink"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@+id/imageViewBomb" />
+
+		<View
+			android:id="@+id/divider"
+			style="@style/Divider.Horizontal"
+			android:layout_width="match_parent"
+			android:layout_height="1dp"
+			android:layout_marginVertical="16dp"
+			android:background="?android:attr/listDivider"
+			app:layout_constraintBottom_toTopOf="@+id/barrier1"
+			app:layout_constraintTop_toBottomOf="@+id/buttonLearnMore" />
+
+		<androidx.constraintlayout.widget.Barrier
+			android:id="@+id/barrier1"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			app:barrierDirection="top" />
+
+		<TextView
+			android:id="@+id/headlineSetting"
+			android:layout_width="0dp"
+			android:layout_height="wrap_content"
+			android:text="@string/disappearing_messages_title"
+			android:textStyle="bold"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@+id/barrier1" />
+
+		<TextView
+			android:id="@+id/textSetting"
+			android:layout_width="0dp"
+			android:layout_height="wrap_content"
+			android:text="@string/disappearing_messages_summary"
+			app:layout_constraintBottom_toTopOf="@id/barrier2"
+			app:layout_constraintEnd_toStartOf="@id/switchDisappearingMessages"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@+id/headlineSetting" />
+
+		<androidx.appcompat.widget.SwitchCompat
+			android:id="@+id/switchDisappearingMessages"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			app:layout_constraintBottom_toTopOf="@id/barrier2"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintStart_toEndOf="@+id/textSetting"
+			app:layout_constraintTop_toBottomOf="@+id/barrier1" />
+
+		<androidx.constraintlayout.widget.Barrier
+			android:id="@+id/barrier2"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			app:barrierDirection="top" />
+
+	</androidx.constraintlayout.widget.ConstraintLayout>
+
+</ScrollView>

briar-android/src/main/res/layout/fragment_conversation_settings_learn_more.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:paddingHorizontal="?dialogPreferredPadding">
+
+	<TextView
+		android:id="@+id/textView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:text="@string/disappearing_messages_explanation_long"
+		app:layout_constraintBottom_toBottomOf="parent"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toTopOf="parent" />
+
+</ScrollView>

briar-android/src/main/res/layout/fragment_keyagreement_id.xml

@@ -20,11 +20,11 @@
 			android:paddingBottom="@dimen/margin_large"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_intro"
-			android:tint="@color/color_primary"
 			app:layout_constraintBottom_toTopOf="@id/explanationImage"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="parent" />
+			app:layout_constraintTop_toTopOf="parent"
+			app:tint="@color/color_primary" />
 
 		<ImageView
 			android:id="@+id/explanationImage"

briar-android/src/main/res/layout/fragment_open_database.xml

@@ -11,13 +11,13 @@
 		android:layout_height="128dp"
 		android:scaleType="center"
 		android:src="@drawable/startup_lock"
-		android:tint="@color/briar_accent"
 		app:layout_constraintBottom_toTopOf="@+id/textView"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.5"
 		app:layout_constraintVertical_chainStyle="packed"
+		app:tint="@color/briar_accent"
 		tools:ignore="ContentDescription" />
 
 	<ProgressBar

briar-android/src/main/res/layout/fragment_sign_out.xml

@@ -11,13 +11,13 @@
 		android:layout_height="128dp"
 		android:scaleType="center"
 		android:src="@drawable/startup_lock"
-		android:tint="@color/briar_primary"
 		app:layout_constraintBottom_toTopOf="@+id/textView"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.5"
 		app:layout_constraintVertical_chainStyle="packed"
+		app:tint="@color/briar_primary"
 		tools:ignore="ContentDescription" />
 
 	<ProgressBar

briar-android/src/main/res/layout/list_item_conversation_msg_image.xml

@@ -68,6 +68,16 @@
 			android:layout_height="wrap_content"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginEnd="4dp"
+			android:src="@drawable/ic_bomb"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription" />
+
 	</LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

briar-android/src/main/res/layout/list_item_conversation_msg_image_text.xml

@@ -67,6 +67,16 @@
 			android:layout_height="wrap_content"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginEnd="4dp"
+			android:src="@drawable/ic_bomb"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription" />
+
 	</LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

briar-android/src/main/res/layout/list_item_conversation_msg_in_content.xml

@@ -68,6 +68,17 @@
 			android:layout_height="wrap_content"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:src="@drawable/ic_bomb"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription"
+			tools:visibility="visible" />
+
 	</LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

briar-android/src/main/res/layout/list_item_conversation_msg_out.xml

@@ -73,11 +73,20 @@
 				style="@style/TextMessage.Timestamp"
 				android:layout_width="wrap_content"
 				android:layout_height="wrap_content"
-				android:layout_marginEnd="6dp"
-				android:layout_marginRight="6dp"
+				android:layout_marginEnd="4dp"
+				android:layout_marginRight="4dp"
 				android:textColor="@color/private_message_date_inverse"
 				tools:text="Dec 24, 13:37" />
 
+			<ImageView
+				android:id="@+id/bomb"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:layout_marginEnd="4dp"
+				android:layout_marginRight="4dp"
+				android:src="@drawable/ic_bomb"
+				tools:ignore="ContentDescription" />
+
 			<ImageView
 				android:id="@+id/status"
 				android:layout_width="wrap_content"

briar-android/src/main/res/layout/list_item_conversation_notice_in.xml

@@ -48,10 +48,28 @@
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			android:layout_marginTop="@dimen/message_bubble_timestamp_margin"
-			app:layout_constraintEnd_toEndOf="@+id/text"
+			app:layout_constraintEnd_toStartOf="@+id/bomb"
+			app:layout_constraintHorizontal_bias="1.0"
+			app:layout_constraintHorizontal_chainStyle="packed"
+			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/text"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:layout_marginTop="@dimen/message_bubble_timestamp_margin"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintEnd_toEndOf="@+id/text"
+			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintTop_toBottomOf="@+id/text"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription"
+			tools:visibility="visible" />
+
 	</androidx.constraintlayout.widget.ConstraintLayout>
 
-</LinearLayout>
+</LinearLayout>

briar-android/src/main/res/layout/list_item_conversation_notice_out.xml

@@ -55,14 +55,26 @@
 			app:layout_constraintTop_toBottomOf="@+id/text"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintBottom_toBottomOf="@+id/time"
+			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintTop_toTopOf="@+id/time"
+			tools:ignore="ContentDescription" />
+
 		<ImageView
 			android:id="@+id/status"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_marginStart="@dimen/margin_medium"
-			android:layout_marginLeft="@dimen/margin_medium"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
 			app:layout_constraintBottom_toBottomOf="@+id/time"
-			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintStart_toEndOf="@+id/bomb"
 			app:layout_constraintTop_toTopOf="@+id/time"
 			tools:ignore="ContentDescription"
 			tools:src="@drawable/message_delivered" />

briar-android/src/main/res/layout/list_item_conversation_request.xml

@@ -68,10 +68,27 @@
 			style="@style/TextMessage.Timestamp"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintEnd_toStartOf="@+id/bomb"
+			app:layout_constraintHorizontal_bias="1.0"
+			app:layout_constraintHorizontal_chainStyle="packed"
+			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/acceptButton"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintTop_toBottomOf="@+id/acceptButton"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription"
+			tools:visibility="visible" />
+
 	</androidx.constraintlayout.widget.ConstraintLayout>
 
-</LinearLayout>
+</LinearLayout>

briar-android/src/main/res/menu/conversation_actions.xml

@@ -1,30 +1,37 @@
 <?xml version="1.0" encoding="utf-8"?>
-<menu
-	xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:app="http://schemas.android.com/apk/res-auto">
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools">
 
 	<item
 		android:id="@+id/action_introduction"
+		android:enabled="false"
 		android:icon="@drawable/introduction_white"
 		android:title="@string/introduction_menu_item"
-		android:enabled="false"
-		app:showAsAction="never"/>
+		app:showAsAction="never" />
 
 	<item
 		android:id="@+id/action_set_alias"
-		android:title="@string/set_contact_alias"
 		android:enabled="false"
-		app:showAsAction="never"/>
+		android:title="@string/set_contact_alias"
+		app:showAsAction="never" />
+
+	<item
+		android:id="@+id/action_conversation_settings"
+		android:title="@string/menu_item_disappearing_messages"
+		android:visible="false"
+		app:showAsAction="never"
+		tools:visible="true" />
 
 	<item
 		android:id="@+id/action_delete_all_messages"
 		android:title="@string/delete_all_messages"
-		app:showAsAction="never"/>
+		app:showAsAction="never" />
 
 	<item
 		android:id="@+id/action_social_remove_person"
 		android:icon="@drawable/action_delete_white"
 		android:title="@string/delete_contact"
-		app:showAsAction="never"/>
+		app:showAsAction="never" />
 
-</menu>
+</menu>

briar-android/src/main/res/values-is/strings.xml

@@ -549,6 +549,7 @@
   <string name="permission_camera_location_title">Myndavél og staðsetning</string>
   <string name="permission_camera_location_request_body">Til að skanna QR-kóðann, þarf Briar aðgang að myndavélinni.\n\nTil að finna Bluetooth-tæki, þarf Briar heimild til að nota staðsetningu þína.\n\nBriar geymir ekki staðsetningar eða deilir þeim með neinum.</string>
   <string name="permission_camera_denied_body">Þú hefur hafnað aðgangi að myndavélinni, en það að bæta við tengiliðum krefst notkun hennar.\n\nÍhugaðu að veita þennan aðgang.</string>
+  <string name="permission_location_denied_body">Þú hefur hafnað aðgangi að staðsetningu, en Briar þarf þessa heimild til að geta fundið Bluetooth-tæki.\n\nÍhugaðu að veita þennan aðgang.</string>
   <string name="qr_code">QR-kóði</string>
   <string name="show_qr_code_fullscreen">Birta QR-kóða á öllum skjánum</string>
   <!--App Locking-->

briar-android/src/main/res/values-it/strings.xml

@@ -549,6 +549,7 @@
   <string name="permission_camera_location_title">Fotocamera e geolocalizzazione</string>
   <string name="permission_camera_location_request_body">Per scansionare il codice QR, Briar ha bisogno di accedere alla fotocamera.\n\nPer trovare dispositivi Bluetooth, Briar ha bisogno di accedere alla tua posizione.\n\nBriar non memorizza la tua posizione, nè la condivide con terzi.</string>
   <string name="permission_camera_denied_body">Hai negato l\'accesso alla fotocamera, ma questa serve per aggiungere i contatti.\n\nConsidera la possibilità di concedere l\'accesso.</string>
+  <string name="permission_location_denied_body">Hai negato l\'accesso alla tua posizione, ma Briar ha bisogno di questa autorizzazione per trovare i dispositivi Bluetooth.\n\nConsidera la possibilità di concedere l\'accesso.</string>
   <string name="qr_code">Codice QR</string>
   <string name="show_qr_code_fullscreen">Mostra codice QR a tutto schermo</string>
   <!--App Locking-->

briar-android/src/main/res/values-tr/strings.xml

@@ -549,6 +549,7 @@
   <string name="permission_camera_location_title">Kamera ve konum</string>
   <string name="permission_camera_location_request_body">QR kodunu taramak için, Briar\'ın kameranıza erişmesi gerekiyor.\n\nBluetooth aygıtlarını keşfetmek için Briar\'ın konumunuza erişmesi gerekiyor.\n\nBriar konumunuzu saklamaz ve hiç kimseyle paylaşmaz.</string>
   <string name="permission_camera_denied_body">Kameraya erişimi engellediniz, ancak kişi eklemek için kamerayı kullanmanız gerekiyor.\n\nLütfen erişim izni vermeyi düşünün.</string>
+  <string name="permission_location_denied_body">Konuma erişimi engellediniz, ancak Briar\'ın Bluetooth aygıtlarını bulabilmek için bu izne ihtiyacı var.\n\nLütfen erişim izni vermeyi düşünün.</string>
   <string name="qr_code">QR kodu</string>
   <string name="show_qr_code_fullscreen">QR kodunu tam ekran göster</string>
   <!--App Locking-->

briar-android/src/main/res/values/strings.xml

@@ -165,6 +165,7 @@
 	<string name="set_contact_alias">Change contact name</string>
 	<string name="set_contact_alias_hint">Contact name</string>
 	<string name="set_alias_button">Change</string>
+	<string name="menu_item_disappearing_messages">Disappearing messages</string>
 	<string name="delete_all_messages">Delete all messages</string>
 	<string name="dialog_title_delete_all_messages">Confirm Message Deletion</string>
 	<string name="dialog_message_delete_all_messages">Are you sure that you want to delete all messages?</string>
@@ -545,6 +546,20 @@
 	<string name="choose_ringtone_title">Choose ringtone</string>
 	<string name="cannot_load_ringtone">Cannot load ringtone</string>
 
+	<!-- Conversation Settings -->
+	<string name="disappearing_messages_title">Disappearing messages</string>
+	<string name="disappearing_messages_cat_title">Self-destructing messages</string>
+	<string name="disappearing_messages_explanation_long">You can configure disappearing messages here.
+		Messages that will disappear are marked with a bomb icon.
+		\n\nTurning on this setting will make new messages in this conversation automatically disappear 7 days after being received.
+		This applies to messages you send to your contact as well as messages your contact sends to you.
+		Your contact can also change this setting for the both of you.
+		\n\nKeep in mind that recipients can still make analogue copies of the messages you sent.
+		\n\nIf you change this setting, it will apply to your messages immediately and to messages of
+		your contact once they receive any message from you after changing the setting.</string>
+	<string name="learn_more">Learn more about disappearing messages</string>
+	<string name="disappearing_messages_summary">Make future messages in this conversation automatically disappear 7\u00A0days after being received.</string>
+
 	<!-- Settings Feedback -->
 	<string name="feedback_settings_title">Feedback</string>
 	<string name="send_feedback">Send feedback</string>

briar-android/witness.gradle

@@ -1,92 +1,102 @@
 dependencyVerification {
     verify = [
-        'androidx.activity:activity-ktx:1.0.0:activity-ktx-1.0.0.aar:be4d4c7e51a42fedb0bc6e68e9c3eba3603d3bbc2ef468689694369f98eab6c7',
-        'androidx.activity:activity:1.0.0:activity-1.0.0.aar:d1bc9842455c2e534415d88c44df4d52413b478db9093a1ba36324f705f44c3d',
+        'androidx.activity:activity-ktx:1.1.0:activity-ktx-1.1.0.aar:1996c36d3d2d62db5020b8ec634b5f854b1a698960c3552e1a00c69221baeabe',
+        'androidx.activity:activity:1.1.0:activity-1.1.0.aar:4f2b35916768032f7d0c20e250e28b29037ed4ce9ebf3da4fcd51bcb0c6067ef',
+        'androidx.annotation:annotation-experimental:1.0.0:annotation-experimental-1.0.0.aar:b219d2b568e7e4ba534e09f8c2fd242343df6ccbdfbbe938846f5d740e6b0b11',
         'androidx.annotation:annotation:1.1.0:annotation-1.1.0.jar:d38d63edb30f1467818d50aaf05f8a692dea8b31392a049bfa991b159ad5b692',
-        'androidx.appcompat:appcompat-resources:1.1.0:appcompat-resources-1.1.0.aar:19944d32b46551a17c347e21894b95837fbd7baaafc9e2082794344f222f7361',
-        'androidx.appcompat:appcompat:1.1.0:appcompat-1.1.0.aar:8d7299bca44cb3bdf17f5595766acbf459fc81fee223e8686cc6acd3a42ab5c0',
+        'androidx.appcompat:appcompat-resources:1.2.0:appcompat-resources-1.2.0.aar:c470297c03ff3de1c3d15dacf0be0cae63abc10b52f021dd07ae28daa3100fe5',
+        'androidx.appcompat:appcompat:1.2.0:appcompat-1.2.0.aar:3d2131a55a61a777322e2126e0018011efa6339e53b44153eb651b16020cca70',
         'androidx.arch.core:core-common:2.1.0:core-common-2.1.0.jar:fe1237bf029d063e7f29fe39aeaf73ef74c8b0a3658486fc29d3c54326653889',
         'androidx.arch.core:core-runtime:2.1.0:core-runtime-2.1.0.aar:dd77615bd3dd275afb11b62df25bae46b10b4a117cd37943af45bdcbf8755852',
         'androidx.cardview:cardview:1.0.0:cardview-1.0.0.aar:1193c04c22a3d6b5946dae9f4e8c59d6adde6a71b6bd5d87fb99d82dda1afec7',
+        'androidx.collection:collection-ktx:1.1.0:collection-ktx-1.1.0.jar:2bfc54475c047131913361f56d0f7f019c6e5bee53eeb0eb7d94a7c499a05227',
         'androidx.collection:collection:1.1.0:collection-1.1.0.jar:632a0e5407461de774409352940e292a291037724207a787820c77daf7d33b72',
-        'androidx.constraintlayout:constraintlayout-solver:1.1.3:constraintlayout-solver-1.1.3.jar:965c177e64fbd81bd1d27b402b66ef9d7bc7b5cb5f718044bf7a453abc542045',
-        'androidx.constraintlayout:constraintlayout:1.1.3:constraintlayout-1.1.3.aar:5ff864def9d41cd04e08348d69591143bae3ceff4284cf8608bceb98c36ac830',
-        'androidx.coordinatorlayout:coordinatorlayout:1.1.0-beta01:coordinatorlayout-1.1.0-beta01.aar:5bde6bee191a6c53073b65f1ccc8eb8ffdf7757aed90755f7b950c3acc7b2552',
-        'androidx.core:core:1.1.0:core-1.1.0.aar:76c7cfbe596fe3c09a6983bf1c89e889299c08ac9a3b52ce5182a088d056647e',
+        'androidx.constraintlayout:constraintlayout-solver:2.0.4:constraintlayout-solver-2.0.4.jar:9ca19f5448709301c7563488ef941be9dfa55c83538ca7a059b2113e83527b46',
+        'androidx.constraintlayout:constraintlayout:2.0.4:constraintlayout-2.0.4.aar:307a79a4a1ccff44249c72a2bf7f47da09fa1b6b1fab2a25808ca889382b738e',
+        'androidx.coordinatorlayout:coordinatorlayout:1.1.0:coordinatorlayout-1.1.0.aar:44a9e30abf56af1025c52a0af506fee9c4131aa55efda52f9fd9451211c5e8cb',
+        'androidx.core:core-ktx:1.1.0:core-ktx-1.1.0.aar:070cc5f8864f449128a2f4b25ca5b67aa3adca3ee1bd611e2eaf1a18fad83178',
+        'androidx.core:core:1.3.1:core-1.3.1.aar:e92ea65a37d589943d405a6a54d1be9d12a225948f26c4e41e511dd55e81efb6',
         'androidx.cursoradapter:cursoradapter:1.0.0:cursoradapter-1.0.0.aar:a81c8fe78815fa47df5b749deb52727ad11f9397da58b16017f4eb2c11e28564',
         'androidx.customview:customview:1.0.0:customview-1.0.0.aar:20e5b8f6526a34595a604f56718da81167c0b40a7a94a57daa355663f2594df2',
         'androidx.documentfile:documentfile:1.0.0:documentfile-1.0.0.aar:865a061ef2fad16522f8433536b8d47208c46ff7c7745197dfa1eeb481869487',
         'androidx.drawerlayout:drawerlayout:1.0.0:drawerlayout-1.0.0.aar:9402442cdc5a43cf62fb14f8cf98c63342d4d9d9b805c8033c6cf7e802749ac1',
-        'androidx.exifinterface:exifinterface:1.0.0:exifinterface-1.0.0.aar:ee48be10aab8f54efff4c14b77d11e10b9eeee4379d5ef6bf297a2923c55cc11',
-        'androidx.fragment:fragment-ktx:1.1.0:fragment-ktx-1.1.0.aar:d40e525a57f21814fe8754e69c7306224ca30ed33f33c17c329b91bd839de94e',
-        'androidx.fragment:fragment-testing:1.1.0:fragment-testing-1.1.0.aar:c4ae4a296df1a05708f7fde215784c7171084d0801fdc3ad12a2163a8ced2a4c',
-        'androidx.fragment:fragment:1.1.0:fragment-1.1.0.aar:a14c8b8f2153f128e800fbd266a6beab1c283982a29ec570d2cc05d307d81496',
+        'androidx.exifinterface:exifinterface:1.3.1:exifinterface-1.3.1.aar:ef168daa6eb744c8395c22b49afa5235e6099868a0377175b6d5e3cdff8d7ffc',
+        'androidx.fragment:fragment-ktx:1.2.5:fragment-ktx-1.2.5.aar:50f0f3b734f93829eeac7456b7cb13e5430741e555c535911a958ee4a8242bca',
+        'androidx.fragment:fragment-testing:1.2.5:fragment-testing-1.2.5.aar:ef3cc3387115f9187665b283e313b13a2bb8826673380317057e2972351df09c',
+        'androidx.fragment:fragment:1.2.4:fragment-1.2.4.aar:1dc194942574302bf35dae7b81b82273505ec2d38f81d9258ad5c0448daddd82',
+        'androidx.fragment:fragment:1.2.5:fragment-1.2.5.aar:d19e82d142def6c4e136da70bf92f194c0ecc61d14ab4e84567b2ced0920fa93',
         'androidx.interpolator:interpolator:1.0.0:interpolator-1.0.0.aar:33193135a64fe21fa2c35eec6688f1a76e512606c0fc83dc1b689e37add7732a',
         'androidx.legacy:legacy-support-core-utils:1.0.0:legacy-support-core-utils-1.0.0.aar:a7edcf01d5b52b3034073027bc4775b78a4764bb6202bb91d61c829add8dd1c7',
-        'androidx.lifecycle:lifecycle-common:2.1.0:lifecycle-common-2.1.0.jar:76db6be533bd730fb361c2feb12a2c26d9952824746847da82601ef81f082643',
-        'androidx.lifecycle:lifecycle-extensions:2.1.0:lifecycle-extensions-2.1.0.aar:bd53c64b038585215b4959c1a388437a3ad525608a31c58e4283c3e371727d4d',
-        'androidx.lifecycle:lifecycle-livedata-core:2.1.0:lifecycle-livedata-core-2.1.0.aar:a150743e86c30eddf1660ad454b1f86041efdefcd1a039320c4c26db87f7119a',
-        'androidx.lifecycle:lifecycle-livedata:2.1.0:lifecycle-livedata-2.1.0.aar:242e446bed3db36f0df0aab0cb7f91060bd2dab7adcad1117adf54e724cd1d26',
-        'androidx.lifecycle:lifecycle-process:2.1.0:lifecycle-process-2.1.0.aar:8cddd0c7f4927bbf71fb71fca000786df82cc597c99463d6916ccbe4a205a9ac',
-        'androidx.lifecycle:lifecycle-runtime:2.1.0:lifecycle-runtime-2.1.0.aar:e5173897b965e870651e83d9d5af1742d3f532d58863223a390ce3a194c8312b',
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+        'com.android.tools:common:27.1.1:common-27.1.1.jar:63d9a2a9ad6d278db319f3749b9f50bdf5457ef7020074a1bebe124e714b535c',
+        'com.android.tools:dvlib:27.1.1:dvlib-27.1.1.jar:998a54201fc1cefee5f2399215e95c42b1f64f9e1d8f4452eb8255c68ba5440f',
+        'com.android.tools:repository:27.1.1:repository-27.1.1.jar:d25b74ccabf4d876903efb375e9af6fb380d8ae0445bb74bbdcc225c1e37fa1d',
+        'com.android.tools:sdk-common:27.1.1:sdk-common-27.1.1.jar:4473ae97d0ef7061ee1de61041d5aa97405ae08e44c09cf7bb278b42e4b97c7c',
+        'com.android.tools:sdklib:27.1.1:sdklib-27.1.1.jar:08e6b83961ac9724b3c1e3d0eff971f13be6701292c77914b8794480f3391250',
+        'com.android:signflinger:4.1.1:signflinger-4.1.1.jar:0c66825988873ec2d51057fa463f54a8f18fc7326ff4530b9da363b71e97ce60',
+        'com.android:zipflinger:4.1.1:zipflinger-4.1.1.jar:0a8c3e52ac13dd031236f9fb5ba4408b1d5dcd12325a05440b36da09d8881446',
         'com.github.bumptech.glide:annotations:4.10.0:annotations-4.10.0.jar:9cdc56335efeffe5b7ea5f7c98555451c6ea3c79c2f95f8e4ce2d4f76de226f8',
         'com.github.bumptech.glide:compiler:4.10.0:compiler-4.10.0.jar:25083f3be077a890e7dda638a57d1a231842c794051f2c9705b857895d588e6d',
         'com.github.bumptech.glide:gifdecoder:4.10.0:gifdecoder-4.10.0.aar:197a1cd5b76855aa02b230c13974e293229b901dc2b96fab4315201e78baa804',
@@ -95,7 +105,7 @@ dependencyVerification {
         'com.github.kobakei:MaterialFabSpeedDial:1.2.1:MaterialFabSpeedDial-1.2.1.aar:e86198c3c48cd832fb209a769a9f222c2a3cc045743b110ac2391d9737e3ea02',
         'com.google.android.apps.common.testing.accessibility.framework:accessibility-test-framework:2.0:accessibility-test-framework-2.0.jar:cdf16ef8f5b8023d003ce3cc1b0d51bda737762e2dab2fedf43d1c4292353f7f',
         'com.google.android.apps.common.testing.accessibility.framework:accessibility-test-framework:2.1:accessibility-test-framework-2.1.jar:7b0aa6ed7553597ce0610684a9f7eca8021eee218f2e2f427c04a7fbf5f920bd',
-        'com.google.android.material:material:1.1.0-beta01:material-1.1.0-beta01.aar:b6f2ef164bf40c04667d9cfe05ae66b81f9b839910a5ca84e5b0ee1608b0a5ad',
+        'com.google.android.material:material:1.2.1:material-1.2.1.aar:d3d0cc776f2341da8e572586c7d390a5b356ce39a0deb2768071dc40b364ac80',
         'com.google.auto.service:auto-service:1.0-rc4:auto-service-1.0-rc4.jar:e422d49c312fd2031222e7306e8108c1b4118eb9c049f1b51eca280bed87e924',
         'com.google.auto:auto-common:0.8:auto-common-0.8.jar:97db1709f57b91b32edacb596ef4641872f227b7d99ad90e467f0d77f5ba134a',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
@@ -105,16 +115,19 @@ dependencyVerification {
         'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
         'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
         'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
+        'com.google.errorprone:error_prone_annotations:2.3.2:error_prone_annotations-2.3.2.jar:357cd6cfb067c969226c442451502aee13800a24e950fdfde77bcdb4565a668d',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
         'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
         'com.google.guava:guava:27.0.1-jre:guava-27.0.1-jre.jar:e1c814fd04492a27c38e0317eabeaa1b3e950ec8010239e400fe90ad6c9107b4',
         'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:guava:28.1-jre:guava-28.1-jre.jar:30beb8b8527bd07c6e747e77f1a92122c2f29d57ce347461a4a55eb26e382da4',
         'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
+        'com.google.j2objc:j2objc-annotations:1.3:j2objc-annotations-1.3.jar:21af30c92267bd6122c0e0b4d20cccb6641a37eaf956c6540ec471d584e64a7b',
         'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
         'com.google.protobuf:protobuf-java:2.6.1:protobuf-java-2.6.1.jar:55aa554843983f431df5616112cf688d38aa17c132357afd1c109435bfdac4e6',
-        'com.google.protobuf:protobuf-java:3.4.0:protobuf-java-3.4.0.jar:dce7e66b32456a1b1198da0caff3a8acb71548658391e798c79369241e6490a4',
+        'com.google.protobuf:protobuf-java:3.10.0:protobuf-java-3.10.0.jar:161d7d61a8cb3970891c299578702fd079646e032329d6c2cabf998d191437c9',
         'com.google.zxing:core:3.3.3:core-3.3.3.jar:5820f81e943e4bce0329306621e2d6255d2930b0a6ce934c5c23c0d6d3f20599',
         'com.googlecode.json-simple:json-simple:1.1:json-simple-1.1.jar:2d9484f4c649f708f47f9a479465fc729770ee65617dca3011836602264f6439',
         'com.ibm.icu:icu4j:53.1:icu4j-53.1.jar:e37a4467bac5cdeb02c5c4b8e5063d2f4e67b69e3c7df6d6b610f13185572bab',
@@ -123,8 +136,8 @@ dependencyVerification {
         'com.squareup:javawriter:2.1.1:javawriter-2.1.1.jar:f699823d0081f69cbb676c1845ea222e0ada79bc88a53e5d22d8bd02d328f57e',
         'com.squareup:javawriter:2.5.0:javawriter-2.5.0.jar:fcfb09fb0ea0aa97d3cfe7ea792398081348e468f126b3603cb3803f240197f0',
         'com.sun.activation:javax.activation:1.2.0:javax.activation-1.2.0.jar:993302b16cd7056f21e779cc577d175a810bb4900ef73cd8fbf2b50f928ba9ce',
-        'com.sun.istack:istack-commons-runtime:2.21:istack-commons-runtime-2.21.jar:c33e67a0807095f02a0e2da139412dd7c4f9cc1a4c054b3e434f96831ba950f4',
-        'com.sun.xml.fastinfoset:FastInfoset:1.2.13:FastInfoset-1.2.13.jar:27a77db909f3c2833c0b1a37c55af1db06045118ad2eed96ce567b6632bce038',
+        'com.sun.istack:istack-commons-runtime:3.0.7:istack-commons-runtime-3.0.7.jar:6443e10ba2e259fb821d9b6becf10db5316285fc30c53cec9d7b19a3877e7fdf',
+        'com.sun.xml.fastinfoset:FastInfoset:1.2.15:FastInfoset-1.2.15.jar:785861db11ca1bd0d1956682b974ad73eb19cd3e01a4b3fa82d62eca97210aec',
         'com.vanniktech:emoji-google:0.6.0:emoji-google-0.6.0.aar:029d6a954cebfe3f0a5bac0c9539a054fa7db2e1272d006a8f0e850f3794d44b',
         'com.vanniktech:emoji:0.6.0:emoji-0.6.0.aar:a5fcde58902305c004f03c6dc2241e718400ac4162226079791d87fac83ef639',
         'commons-codec:commons-codec:1.10:commons-codec-1.10.jar:4241dfa94e711d435f29a4604a3e2de5c4aa3c165e23bd066be6fc1fc4309569',
@@ -133,10 +146,11 @@ dependencyVerification {
         'info.guardianproject.panic:panic:1.0:panic-1.0.jar:35116ab95212e67f94577faf67b88c11a6b21cbf9178b3f5b51d3dff45203ffd',
         'info.guardianproject.trustedintents:trustedintents:0.2:trustedintents-0.2.jar:6221456d8821a8d974c2acf86306900237cf6afaaa94a4c9c44e161350f80f3e',
         'it.unimi.dsi:fastutil:7.2.0:fastutil-7.2.0.jar:74fa208043740642f7e6eb09faba15965218ad2f50ce3020efb100136e4b591c',
+        'javax.activation:javax.activation-api:1.2.0:javax.activation-api-1.2.0.jar:43fdef0b5b6ceb31b0424b208b930c74ab58fac2ceeb7b3f6fd3aeb8b5ca4393',
         'javax.annotation:javax.annotation-api:1.3.2:javax.annotation-api-1.3.2.jar:e04ba5195bcd555dc95650f7cc614d151e4bcd52d29a10b8aa2197f3ab89ab9b',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
-        'javax.xml.bind:jaxb-api:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
+        'javax.xml.bind:jaxb-api:2.3.1:jaxb-api-2.3.1.jar:88b955a0df57880a26a74708bc34f74dcaf8ebf4e78843a28b50eae945732b06',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'nekohtml:nekohtml:1.9.6.2:nekohtml-1.9.6.2.jar:fdff6cfa9ed9cc911c842a5d2395f209ec621ef1239d46810e9e495809d3ae09',
         'nekohtml:xercesMinimal:1.9.6.2:xercesMinimal-1.9.6.2.jar:95b8b357d19f63797dd7d67622fd3f18374d64acbc6584faba1c7759a31e8438',
@@ -171,45 +185,40 @@ dependencyVerification {
         'org.bouncycastle:bcprov-jdk15on:1.56:bcprov-jdk15on-1.56.jar:963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
+        'org.checkerframework:checker-qual:2.8.1:checker-qual-2.8.1.jar:9103499008bcecd4e948da29b17864abb64304e15706444ae209d17ebe0575df',
         'org.codehaus.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
         'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.18:animal-sniffer-annotations-1.18.jar:47f05852b48ee9baefef80fa3d8cea60efa4753c0013121dd7fe5eef2e5c729d',
         'org.codehaus.plexus:plexus-container-default:1.0-alpha-9-stable-1:plexus-container-default-1.0-alpha-9-stable-1.jar:7c758612888782ccfe376823aee7cdcc7e0cdafb097f7ef50295a0b0c3a16edf',
         'org.codehaus.plexus:plexus-interpolation:1.11:plexus-interpolation-1.11.jar:fd9507feb858fa620d1b4aa4b7039fdea1a77e09d3fd28cfbddfff468d9d8c28',
         'org.codehaus.plexus:plexus-utils:1.5.15:plexus-utils-1.5.15.jar:2ca121831e597b4d8f2cb22d17c5c041fc23a7777ceb6bfbdd4dfb34bbe7d997',
-        'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
-        'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
-        'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
+        'org.glassfish.jaxb:jaxb-runtime:2.3.1:jaxb-runtime-2.3.1.jar:45fecfa5c8217ce1f3652ab95179790ec8cc0dec0384bca51cbeb94a293d9f2f',
+        'org.glassfish.jaxb:txw2:2.3.1:txw2-2.3.1.jar:34975dde1c6920f1a39791142235689bc3cd357e24d05edd8ff93b885bd68d60',
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         'org.hamcrest:hamcrest-integration:1.3:hamcrest-integration-1.3.jar:70f418efbb506c5155da5f9a5a33262ea08a9e4d7fea186aa9015c41a7224ac2',
         'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
-        'org.jetbrains.kotlin:kotlin-reflect:1.3.50:kotlin-reflect-1.3.50.jar:64583199ea5a54aefd1bd1595288925f784226ee562d1dd279011c6075b3d7a4',
-        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.31:kotlin-stdlib-common-1.3.31.jar:d6e9c54c1e6c4df21be9395de558665544c6bdc8f8076ea7518f089f82cd34fc',
+        'org.jetbrains.kotlin:kotlin-reflect:1.3.72:kotlin-reflect-1.3.72.jar:a188d9367de1c4ee9479db630985c0597b20709c83161b1430d24edb27e38c40',
         'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50:kotlin-stdlib-common-1.3.50.jar:8ce678e88e4ba018b66dacecf952471e4d7dfee156a8a819760a5a5ff29d323c',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50:kotlin-stdlib-jdk7-1.3.50.jar:9a026639e76212f8d57b86d55b075394c2e009f1979110751d34c05c5f75d57b',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50:kotlin-stdlib-jdk8-1.3.50.jar:1b351fb6e09c14b55525c74c1f4cf48942eae43c348b7bc764a5e6e423d4da0c',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.3.31:kotlin-stdlib-1.3.31.jar:f38c84326543e66ed4895b20fb3ea0fca527fd5a040e1f49d0946ecf3d2b3b23',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.72:kotlin-stdlib-common-1.3.72.jar:5e7d1552863e480c1628b1cc39ce230ef829f5b7230106215a05acda5172203a',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.72:kotlin-stdlib-jdk7-1.3.72.jar:40566c0c08d414b9413ba556ff7f8a0b04b98b9f0f424d122dd2088510efccc4',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.72:kotlin-stdlib-jdk8-1.3.72.jar:133da70cfc07b56094282eac5c59bccd59f167ee2ead22e5282876d8bc10bf95',
         'org.jetbrains.kotlin:kotlin-stdlib:1.3.50:kotlin-stdlib-1.3.50.jar:e6f05746ee0366d0b52825a090fac474dcf44082c9083bbb205bd16976488d6c',
-        'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.1:kotlinx-coroutines-android-1.1.1.jar:ed6fc7d667d5c11d187894789d7bf6cf8fedccb0be75fde795b8686582a1fe32',
-        'org.jetbrains.kotlinx:kotlinx-coroutines-core-common:1.1.1:kotlinx-coroutines-core-common-1.1.1.jar:033732168fd3a68a7d788294321106ae13536eae8459382a85cc1f17f88572e7',
-        'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.1.1:kotlinx-coroutines-core-1.1.1.jar:ac423f8a0aa4b4e74529696ff82c0171f81a8c8ab182a1965dff25e69c1f7844',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.3.72:kotlin-stdlib-1.3.72.jar:3856a7349ebacd6d1be6802b2fed9c4dc2c5a564ea92b6b945ac988243d4b16b',
+        'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0:kotlinx-coroutines-android-1.3.0.jar:c80aaadf041f044d324a19a73f88879dfd1e4d026b14e3230075ff9081942ae3',
+        'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0:kotlinx-coroutines-core-1.3.0.jar:6f3a60fea2403b80385b399952aeb3a4cf0985a45b8da04b6f31825171901a1d',
         'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
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-        'org.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
+        'org.jvnet.staxex:stax-ex:1.8:stax-ex-1.8.jar:95b05d9590af4154c6513b9c5dc1fb2e55b539972ba0a9ef28e9a0c01d83ad77',
         'org.mockito:mockito-core:3.1.0:mockito-core-3.1.0.jar:89b09e518e04f5c35f5ccf7abe45e72f594070a53d95cc2579001bd392c5afa6',
         'org.objenesis:objenesis:2.6:objenesis-2.6.jar:5e168368fbc250af3c79aa5fef0c3467a2d64e5a7bd74005f25d8399aeb0708d',
-        'org.ow2.asm:asm-analysis:6.0:asm-analysis-6.0.jar:2f1a6387219c3a6cc4856481f221b03bd9f2408a326d416af09af5d6f608c1f4',
         'org.ow2.asm:asm-analysis:7.0:asm-analysis-7.0.jar:e981f8f650c4d900bb033650b18e122fa6b161eadd5f88978d08751f72ee8474',
-        'org.ow2.asm:asm-commons:6.0:asm-commons-6.0.jar:f1bce5c648a96a017bdcd01fe5d59af9845297fd7b79b81c015a6fbbd9719abf',
         'org.ow2.asm:asm-commons:7.0:asm-commons-7.0.jar:fed348ef05958e3e846a3ac074a12af5f7936ef3d21ce44a62c4fa08a771927d',
-        'org.ow2.asm:asm-tree:6.0:asm-tree-6.0.jar:887998fb69727c8759e4d253f856822801e33f9fd4caa566b3ac58ee92106215',
         'org.ow2.asm:asm-tree:7.0:asm-tree-7.0.jar:cfd7a0874f9de36a999c127feeadfbfe6e04d4a71ee954d7af3d853f0be48a6c',
-        'org.ow2.asm:asm-util:6.0:asm-util-6.0.jar:356afebdb0f870175262e5188f8709a3b17aa2a5a6a4b0340b04d4b449bca5f6',
         'org.ow2.asm:asm-util:7.0:asm-util-7.0.jar:75fbbca440ef463f41c2b0ab1a80abe67e910ac486da60a7863cbcb5bae7e145',
-        'org.ow2.asm:asm:6.0:asm-6.0.jar:dd8971c74a4e697899a8e95caae4ea8760ea6c486dc6b97b1795e75760420461',
         'org.ow2.asm:asm:7.0:asm-7.0.jar:b88ef66468b3c978ad0c97fd6e90979e56155b4ac69089ba7a44e9aa7ffe9acf',
         'org.robolectric:annotations:4.3.1:annotations-4.3.1.jar:ce679af70c22620b5752aa6c1555d0653198d6370e9a93fe71b8eaaebc5ffaf6',
         'org.robolectric:junit:4.3.1:junit-4.3.1.jar:60c85ea7fd652bc4e57567cbd3c41c5d32f2c678e212b713cefa6c63570451ce',

briar-api/src/main/java/org/briarproject/briar/api/autodelete/AutoDeleteConstants.java

@@ -0,0 +1,23 @@
+package org.briarproject.briar.api.autodelete;
+
+import static java.util.concurrent.TimeUnit.DAYS;
+import static java.util.concurrent.TimeUnit.MINUTES;
+
+public interface AutoDeleteConstants {
+
+	/**
+	 * The minimum valid auto-delete timer duration in milliseconds.
+	 */
+	long MIN_AUTO_DELETE_TIMER_MS = MINUTES.toMillis(1);
+
+	/**
+	 * The maximum valid auto-delete timer duration in milliseconds.
+	 */
+	long MAX_AUTO_DELETE_TIMER_MS = DAYS.toMillis(365);
+
+	/**
+	 * Placeholder value indicating that a message has no auto-delete timer.
+	 * This value should not be sent over the wire - send null instead.
+	 */
+	long NO_AUTO_DELETE_TIMER = -1;
+}

briar-api/src/main/java/org/briarproject/briar/api/autodelete/AutoDeleteManager.java

@@ -0,0 +1,56 @@
+package org.briarproject.briar.api.autodelete;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.Transaction;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.sync.ClientId;
+
+@NotNullByDefault
+public interface AutoDeleteManager {
+
+	/**
+	 * The unique ID of the auto-delete client.
+	 */
+	ClientId CLIENT_ID = new ClientId("org.briarproject.briar.autodelete");
+
+	/**
+	 * The current major version of the auto-delete client.
+	 */
+	int MAJOR_VERSION = 0;
+
+	/**
+	 * The current minor version of the auto-delete client.
+	 */
+	int MINOR_VERSION = 0;
+
+	/**
+	 * Returns the auto-delete timer duration for the given contact. Use
+	 * {@link #getAutoDeleteTimer(Transaction, ContactId, long)} if the timer
+	 * will be used in an outgoing message.
+	 */
+	long getAutoDeleteTimer(Transaction txn, ContactId c) throws DbException;
+
+	/**
+	 * Returns the auto-delete timer duration for the given contact, for use in
+	 * a message with the given timestamp. The timestamp is stored.
+	 */
+	long getAutoDeleteTimer(Transaction txn, ContactId c, long timestamp)
+			throws DbException;
+
+	/**
+	 * Sets the auto-delete timer duration for the given contact.
+	 */
+	void setAutoDeleteTimer(Transaction txn, ContactId c, long timer)
+			throws DbException;
+
+	/**
+	 * Receives an auto-delete timer duration from the given contact, carried
+	 * in a message with the given timestamp. The local timer is set to the
+	 * same duration unless it has been
+	 * {@link #setAutoDeleteTimer(Transaction, ContactId, long) changed} more
+	 * recently than the remote timer.
+	 */
+	void receiveAutoDeleteTimer(Transaction txn, ContactId c, long timer,
+			long timestamp) throws DbException;
+}

briar-api/src/main/java/org/briarproject/briar/api/blog/BlogInvitationRequest.java

@@ -15,9 +15,9 @@ public class BlogInvitationRequest extends InvitationRequest<Blog> {
 	public BlogInvitationRequest(MessageId id, GroupId groupId, long time,
 			boolean local, boolean read, boolean sent, boolean seen,
 			SessionId sessionId, Blog blog, @Nullable String text,
-			boolean available, boolean canBeOpened) {
+			boolean available, boolean canBeOpened, long autoDeleteTimer) {
 		super(id, groupId, time, local, read, sent, seen, sessionId, blog,
-				text, available, canBeOpened);
+				text, available, canBeOpened, autoDeleteTimer);
 	}
 
 	@Override

briar-api/src/main/java/org/briarproject/briar/api/blog/BlogInvitationResponse.java

@@ -12,9 +12,10 @@ public class BlogInvitationResponse extends InvitationResponse {
 
 	public BlogInvitationResponse(MessageId id, GroupId groupId, long time,
 			boolean local, boolean read, boolean sent, boolean seen,
-			SessionId sessionId, boolean accept, GroupId shareableId) {
+			SessionId sessionId, boolean accept, GroupId shareableId,
+			long autoDeleteTimer) {
 		super(id, groupId, time, local, read, sent, seen, sessionId,
-				accept, shareableId);
+				accept, shareableId, autoDeleteTimer);
 	}
 
 	@Override

briar-api/src/main/java/org/briarproject/briar/api/blog/BlogSharingManager.java

@@ -18,5 +18,5 @@ public interface BlogSharingManager extends SharingManager<Blog> {
 	/**
 	 * The current minor version of the blog sharing client.
 	 */
-	int MINOR_VERSION = 0;
+	int MINOR_VERSION = 1;
 }

briar-api/src/main/java/org/briarproject/briar/api/conversation/ConversationManager.java

@@ -43,6 +43,18 @@ public interface ConversationManager {
 	 */
 	GroupCount getGroupCount(ContactId c) throws DbException;
 
+	/**
+	 * Returns the unified group count for all private conversation messages.
+	 */
+	GroupCount getGroupCount(Transaction txn, ContactId c) throws DbException;
+
+	/**
+	 * Returns a timestamp for an outgoing message, which is later than the
+	 * timestamp of any message in the conversation with the given contact.
+	 */
+	long getTimestampForOutgoingMessage(Transaction txn, ContactId c)
+			throws DbException;
+
 	/**
 	 * Deletes all messages exchanged with the given contact.
 	 */

briar-api/src/main/java/org/briarproject/briar/api/conversation/ConversationMessageHeader.java

@@ -12,18 +12,20 @@ public abstract class ConversationMessageHeader {
 
 	private final MessageId id;
 	private final GroupId groupId;
-	private final long timestamp;
-	private final boolean local, sent, seen, read;
+	private final long timestamp, autoDeleteTimer;
+	private final boolean local, read, sent, seen;
 
-	public ConversationMessageHeader(MessageId id, GroupId groupId, long timestamp,
-			boolean local, boolean read, boolean sent, boolean seen) {
+	public ConversationMessageHeader(MessageId id, GroupId groupId,
+			long timestamp, boolean local, boolean read, boolean sent,
+			boolean seen, long autoDeleteTimer) {
 		this.id = id;
 		this.groupId = groupId;
 		this.timestamp = timestamp;
 		this.local = local;
+		this.read = read;
 		this.sent = sent;
 		this.seen = seen;
-		this.read = read;
+		this.autoDeleteTimer = autoDeleteTimer;
 	}
 
 	public MessageId getId() {
@@ -55,4 +57,8 @@ public abstract class ConversationMessageHeader {
 	}
 
 	public abstract <T> T accept(ConversationMessageVisitor<T> v);
+
+	public long getAutoDeleteTimer() {
+		return autoDeleteTimer;
+	}
 }

briar-api/src/main/java/org/briarproject/briar/api/conversation/ConversationRequest.java

@@ -20,11 +20,12 @@ public abstract class ConversationRequest<N extends Nameable>
 	private final String text;
 	private final boolean answered;
 
-	public ConversationRequest(MessageId messageId, GroupId groupId, long time,
-			boolean local, boolean read, boolean sent, boolean seen,
-			SessionId sessionId, N nameable, @Nullable String text,
-			boolean answered) {
-		super(messageId, groupId, time, local, read, sent, seen);
+	public ConversationRequest(MessageId messageId, GroupId groupId,
+			long timestamp, boolean local, boolean read, boolean sent,
+			boolean seen, SessionId sessionId, N nameable,
+			@Nullable String text, boolean answered, long autoDeleteTimer) {
+		super(messageId, groupId, timestamp, local, read, sent, seen,
+				autoDeleteTimer);
 		this.sessionId = sessionId;
 		this.nameable = nameable;
 		this.text = text;

briar-api/src/main/java/org/briarproject/briar/api/conversation/ConversationResponse.java

@@ -16,8 +16,8 @@ public abstract class ConversationResponse extends ConversationMessageHeader {
 
 	public ConversationResponse(MessageId id, GroupId groupId, long time,
 			boolean local, boolean read, boolean sent, boolean seen,
-			SessionId sessionId, boolean accepted) {
-		super(id, groupId, time, local, read, sent, seen);
+			SessionId sessionId, boolean accepted, long autoDeleteTimer) {
+		super(id, groupId, time, local, read, sent, seen, autoDeleteTimer);
 		this.sessionId = sessionId;
 		this.accepted = accepted;
 	}

briar-api/src/main/java/org/briarproject/briar/api/forum/ForumInvitationRequest.java

@@ -17,9 +17,9 @@ public class ForumInvitationRequest extends InvitationRequest<Forum> {
 	public ForumInvitationRequest(MessageId id, GroupId groupId, long time,
 			boolean local, boolean read, boolean sent, boolean seen,
 			SessionId sessionId, Forum forum, @Nullable String text,
-			boolean available, boolean canBeOpened) {
+			boolean available, boolean canBeOpened, long autoDeleteTimer) {
 		super(id, groupId, time, local, read, sent, seen, sessionId, forum,
-				text, available, canBeOpened);
+				text, available, canBeOpened, autoDeleteTimer);
 	}
 
 	@Override

briar-api/src/main/java/org/briarproject/briar/api/forum/ForumInvitationResponse.java

@@ -15,9 +15,10 @@ public class ForumInvitationResponse extends InvitationResponse {
 
 	public ForumInvitationResponse(MessageId id, GroupId groupId, long time,
 			boolean local, boolean read, boolean sent, boolean seen,
-			SessionId sessionId, boolean accept, GroupId shareableId) {
+			SessionId sessionId, boolean accept, GroupId shareableId,
+			long autoDeleteTimer) {
 		super(id, groupId, time, local, read, sent, seen, sessionId,
-				accept, shareableId);
+				accept, shareableId, autoDeleteTimer);
 	}
 
 	@Override

briar-api/src/main/java/org/briarproject/briar/api/forum/ForumSharingManager.java

@@ -18,5 +18,5 @@ public interface ForumSharingManager extends SharingManager<Forum> {
 	/**
 	 * The current minor version of the forum sharing client.
 	 */
-	int MINOR_VERSION = 0;
+	int MINOR_VERSION = 1;
 }

briar-api/src/main/java/org/briarproject/briar/api/introduction/IntroductionManager.java

@@ -31,18 +31,18 @@ public interface IntroductionManager extends ConversationClient {
 	/**
 	 * The current minor version of the introduction client.
 	 */
-	int MINOR_VERSION = 0;
+	int MINOR_VERSION = 1;
 
 	/**
 	 * Sends two initial introduction messages.
 	 */
-	void makeIntroduction(Contact c1, Contact c2, @Nullable String text,
-			long timestamp) throws DbException;
+	void makeIntroduction(Contact c1, Contact c2, @Nullable String text)
+			throws DbException;
 
 	/**
 	 * Responds to an introduction.
 	 */
 	void respondToIntroduction(ContactId contactId, SessionId sessionId,
-			long timestamp, boolean accept) throws DbException;
+			boolean accept) throws DbException;
 
 }

briar-api/src/main/java/org/briarproject/briar/api/introduction/IntroductionRequest.java

@@ -18,12 +18,12 @@ public class IntroductionRequest extends ConversationRequest<Author> {
 
 	private final AuthorInfo authorInfo;
 
-	public IntroductionRequest(MessageId messageId, GroupId groupId,
-			long time, boolean local, boolean read, boolean sent, boolean seen,
+	public IntroductionRequest(MessageId messageId, GroupId groupId, long time,
+			boolean local, boolean read, boolean sent, boolean seen,
 			SessionId sessionId, Author author, @Nullable String text,
-			boolean answered, AuthorInfo authorInfo) {
+			boolean answered, AuthorInfo authorInfo, long autoDeleteTimer) {
 		super(messageId, groupId, time, local, read, sent, seen, sessionId,
-				author, text, answered);
+				author, text, answered, autoDeleteTimer);
 		this.authorInfo = authorInfo;
 	}
 

briar-api/src/main/java/org/briarproject/briar/api/introduction/IntroductionResponse.java

@@ -25,9 +25,10 @@ public class IntroductionResponse extends ConversationResponse {
 	public IntroductionResponse(MessageId messageId, GroupId groupId, long time,
 			boolean local, boolean read, boolean sent, boolean seen,
 			SessionId sessionId, boolean accepted, Author author,
-			AuthorInfo introducedAuthorInfo, Role role, boolean canSucceed) {
+			AuthorInfo introducedAuthorInfo, Role role, boolean canSucceed,
+			long autoDeleteTimer) {
 		super(messageId, groupId, time, local, read, sent, seen, sessionId,
-				accepted);
+				accepted, autoDeleteTimer);
 		this.introducedAuthor = author;
 		this.introducedAuthorInfo = introducedAuthorInfo;
 		this.ourRole = role;

briar-api/src/main/java/org/briarproject/briar/api/messaging/MessagingManager.java

@@ -30,13 +30,18 @@ public interface MessagingManager extends ConversationClient {
 	/**
 	 * The current minor version of the messaging client.
 	 */
-	int MINOR_VERSION = 2;
+	int MINOR_VERSION = 3;
 
 	/**
 	 * Stores a local private message.
 	 */
 	void addLocalMessage(PrivateMessage m) throws DbException;
 
+	/**
+	 * Stores a local private message.
+	 */
+	void addLocalMessage(Transaction txn, PrivateMessage m) throws DbException;
+
 	/**
 	 * Stores a local attachment message.
 	 *
@@ -77,12 +82,8 @@ public interface MessagingManager extends ConversationClient {
 	Attachment getAttachment(AttachmentHeader h) throws DbException;
 
 	/**
-	 * Returns true if the contact with the given {@link ContactId} does support
-	 * image attachments.
-	 *
-	 * Added: 2019-01-01
+	 * Returns the private message format supported by the given contact.
 	 */
-	boolean contactSupportsImages(Transaction txn, ContactId c)
+	PrivateMessageFormat getContactMessageFormat(Transaction txn, ContactId c)
 			throws DbException;
-
 }