Merge branch 'social-backup-restore-activity' into 'social-backup-poc'

Social backup restore activity

See merge request briar/briar!1444

.idea/codeStyles/Project.xml

@@ -31,15 +31,6 @@
       <option name="PACKAGES_TO_USE_STAR_IMPORTS">
         <value />
       </option>
-      <option name="PACKAGES_IMPORT_LAYOUT">
-        <value>
-          <package name="" alias="false" withSubpackages="true" />
-          <package name="java" alias="false" withSubpackages="true" />
-          <package name="javax" alias="false" withSubpackages="true" />
-          <package name="kotlin" alias="false" withSubpackages="true" />
-          <package name="" alias="true" withSubpackages="true" />
-        </value>
-      </option>
       <option name="NAME_COUNT_TO_USE_STAR_IMPORT" value="2147483647" />
       <option name="NAME_COUNT_TO_USE_STAR_IMPORT_FOR_MEMBERS" value="2147483647" />
       <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />

bramble-api/src/main/java/org/briarproject/bramble/api/account/AccountManager.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.api.account;
 
 import org.briarproject.bramble.api.crypto.DecryptionException;
 import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.identity.Identity;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
@@ -43,6 +44,17 @@ public interface AccountManager {
 	 */
 	boolean createAccount(String name, String password);
 
+	/**
+	 * Restores a given identity by registering it with the
+	 * {@link IdentityManager}.  Creates a database key, encrypts it with the
+	 * given password and stores it on disk. {@link #accountExists()} will
+	 * return true after this method returns true.
+ 	 * @param identity
+	 * @param password
+	 * @return
+	 */
+	boolean restoreAccount(Identity identity, String password);
+
 	/**
 	 * Deletes all account state from disk. {@link #accountExists()} will
 	 * return false after this method returns.

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactManager.java

@@ -3,6 +3,7 @@ package org.briarproject.bramble.api.contact;
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.UnsupportedVersionException;
+import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.ContactExistsException;
 import org.briarproject.bramble.api.db.DbException;
@@ -48,6 +49,9 @@ public interface ContactManager {
 			SecretKey rootKey, long timestamp, boolean alice, boolean verified,
 			boolean active) throws DbException;
 
+	ContactId addContact(Transaction txn, Author remote, AuthorId local,
+			PublicKey handshake, boolean verified) throws DbException;
+
 	/**
 	 * Stores a contact associated with the given local and remote pseudonyms,
 	 * replacing the given pending contact, derives and stores handshake mode

bramble-api/src/main/java/org/briarproject/bramble/api/contact/HandshakeManager.java

@@ -24,6 +24,19 @@ public interface HandshakeManager {
 	HandshakeResult handshake(PendingContactId p, InputStream in,
 			StreamWriter out) throws DbException, IOException;
 
+	/**
+	 * Handshakes with the given contact. Returns an ephemeral master key
+	 * authenticated with both parties' handshake key pairs and a flag
+	 * indicating whether the local peer is Alice or Bob.
+	 *
+	 * @param in An incoming stream for the handshake, which must be secured in
+	 * handshake mode
+	 * @param out An outgoing stream for the handshake, which must be secured
+	 * in handshake mode
+	 */
+	HandshakeResult handshake(ContactId c, InputStream in, StreamWriter out)
+			throws DbException, IOException;
+
 	class HandshakeResult {
 
 		private final SecretKey masterKey;

bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeyManager.java

@@ -35,6 +35,20 @@ public interface KeyManager {
 			ContactId c, SecretKey rootKey, long timestamp, boolean alice,
 			boolean active) throws DbException;
 
+	/**
+	 * Derives and stores a set of rotation mode transport keys for
+	 * communicating with the given contact over each transport and returns the
+	 * key set IDs.
+	 * <p/>
+	 * {@link StreamContext StreamContexts} for the contact can be created
+	 * after this method has returned.
+	 *
+	 * @param alice True if the local party is Alice
+	 * @param active Whether the derived keys can be used for outgoing streams
+	 */
+	Map<TransportId, KeySetId> addRotationKeys(ContactId c, SecretKey rootKey,
+			long timestamp, boolean alice, boolean active) throws DbException;
+
 	/**
 	 * Informs the key manager that a new contact has been added. Derives and
 	 * stores a set of handshake mode transport keys for communicating with the

bramble-core/src/main/java/org/briarproject/bramble/account/AccountManagerImpl.java

@@ -176,6 +176,18 @@ class AccountManagerImpl implements AccountManager {
 		}
 	}
 
+	public boolean restoreAccount(Identity identity, String password) {
+		synchronized (stateChangeLock) {
+			if (hasDatabaseKey())
+				throw new AssertionError("Already have a database key");
+			identityManager.registerIdentity(identity);
+			SecretKey key = crypto.generateSecretKey();
+			if (!encryptAndStoreDatabaseKey(key, password)) return false;
+			databaseKey = key;
+			return true;
+		}
+	}
+
 	@GuardedBy("stateChangeLock")
 	private boolean encryptAndStoreDatabaseKey(SecretKey key, String password) {
 		byte[] plaintext = key.getBytes();

bramble-core/src/main/java/org/briarproject/bramble/connection/ConnectionManagerImpl.java

@@ -76,7 +76,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 		ioExecutor.execute(new IncomingDuplexSyncConnection(keyManager,
 				connectionRegistry, streamReaderFactory, streamWriterFactory,
 				syncSessionFactory, transportPropertyManager, ioExecutor,
-				t, d));
+				t, d, handshakeManager));
 	}
 
 	@Override
@@ -101,7 +101,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 		ioExecutor.execute(new OutgoingDuplexSyncConnection(keyManager,
 				connectionRegistry, streamReaderFactory, streamWriterFactory,
 				syncSessionFactory, transportPropertyManager, ioExecutor,
-				secureRandom, c, t, d));
+				secureRandom, handshakeManager, c, t, d));
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/connection/DuplexSyncConnection.java

@@ -3,6 +3,7 @@ package org.briarproject.bramble.connection;
 import org.briarproject.bramble.api.connection.ConnectionRegistry;
 import org.briarproject.bramble.api.connection.InterruptibleConnection;
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.HandshakeManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;

bramble-core/src/main/java/org/briarproject/bramble/connection/IncomingDuplexSyncConnection.java

@@ -2,6 +2,8 @@ package org.briarproject.bramble.connection;
 
 import org.briarproject.bramble.api.connection.ConnectionRegistry;
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.HandshakeManager;
+import org.briarproject.bramble.api.contact.PendingContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportId;
@@ -13,9 +15,11 @@ import org.briarproject.bramble.api.sync.SyncSessionFactory;
 import org.briarproject.bramble.api.transport.KeyManager;
 import org.briarproject.bramble.api.transport.StreamContext;
 import org.briarproject.bramble.api.transport.StreamReaderFactory;
+import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.concurrent.Executor;
 
 import static java.util.logging.Level.WARNING;
@@ -24,6 +28,10 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 @NotNullByDefault
 class IncomingDuplexSyncConnection extends DuplexSyncConnection
 		implements Runnable {
+	private final HandshakeManager handshakeManager;
+
+	// FIXME: Exchange timestamp as part of handshake protocol?
+	private static final long TIMESTAMP = 1617235200; // 1 April 2021 00:00 UTC
 
 	IncomingDuplexSyncConnection(KeyManager keyManager,
 			ConnectionRegistry connectionRegistry,
@@ -32,10 +40,12 @@ class IncomingDuplexSyncConnection extends DuplexSyncConnection
 			SyncSessionFactory syncSessionFactory,
 			TransportPropertyManager transportPropertyManager,
 			Executor ioExecutor, TransportId transportId,
-			DuplexTransportConnection connection) {
+			DuplexTransportConnection connection,
+			HandshakeManager handshakeManager) {
 		super(keyManager, connectionRegistry, streamReaderFactory,
 				streamWriterFactory, syncSessionFactory,
 				transportPropertyManager, ioExecutor, transportId, connection);
+		this.handshakeManager = handshakeManager;
 	}
 
 	@Override
@@ -54,10 +64,22 @@ class IncomingDuplexSyncConnection extends DuplexSyncConnection
 			return;
 		}
 		if (ctx.isHandshakeMode()) {
-			// TODO: Support handshake mode for contacts
+            if (!performHandshake(ctx, contactId)) {
-			LOG.warning("Received handshake tag, expected rotation mode");
+               LOG.warning("Handshake failed");
-			onReadError(true);
+               return;
-			return;
+            }
+			// Allocate a rotation mode stream context
+			ctx = allocateStreamContext(contactId, transportId);
+			if (ctx == null) {
+				LOG.warning("Could not allocate stream context");
+				onWriteError();
+				return;
+			}
+			if (ctx.isHandshakeMode()) {
+				LOG.warning("Got handshake mode context after handshaking");
+				onWriteError();
+				return;
+			}
 		}
 		connectionRegistry.registerIncomingConnection(contactId, transportId,
 				this);
@@ -103,5 +125,33 @@ class IncomingDuplexSyncConnection extends DuplexSyncConnection
 			onWriteError();
 		}
 	}
+
+	private boolean performHandshake(StreamContext ctxIn, ContactId contactId) {
+		// Allocate the outgoing stream context
+		StreamContext ctxOut =
+				allocateStreamContext(contactId, transportId);
+		if (ctxOut == null) {
+			LOG.warning("Could not allocate stream context");
+			onReadError(true);
+			return false;
+		}
+		try {
+			InputStream in = streamReaderFactory.createStreamReader(
+					reader.getInputStream(), ctxIn);
+			// Flush the output stream to send the outgoing stream header
+			StreamWriter out = streamWriterFactory.createStreamWriter(
+					writer.getOutputStream(), ctxOut);
+			out.getOutputStream().flush();
+			HandshakeManager.HandshakeResult result =
+					handshakeManager.handshake(contactId, in, out);
+			keyManager.addRotationKeys(contactId, result.getMasterKey(),
+					TIMESTAMP, result.isAlice(), true);
+			return true;
+		} catch (IOException | DbException e) {
+			logException(LOG, WARNING, e);
+			onReadError(true);
+			return false;
+		}
+	}
 }
 

bramble-core/src/main/java/org/briarproject/bramble/connection/OutgoingDuplexSyncConnection.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.connection;
 
 import org.briarproject.bramble.api.connection.ConnectionRegistry;
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.HandshakeManager;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportId;
@@ -14,9 +15,11 @@ import org.briarproject.bramble.api.sync.SyncSessionFactory;
 import org.briarproject.bramble.api.transport.KeyManager;
 import org.briarproject.bramble.api.transport.StreamContext;
 import org.briarproject.bramble.api.transport.StreamReaderFactory;
+import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.security.SecureRandom;
 import java.util.concurrent.Executor;
 
@@ -28,21 +31,31 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 class OutgoingDuplexSyncConnection extends DuplexSyncConnection
 		implements Runnable {
 
+	// FIXME: Exchange timestamp as part of handshake protocol?
+	private static final long TIMESTAMP = 1617235200; // 1 April 2021 00:00 UTC
+
 	private final SecureRandom secureRandom;
+	private final HandshakeManager handshakeManager;
 	private final ContactId contactId;
 
-	OutgoingDuplexSyncConnection(KeyManager keyManager,
+	OutgoingDuplexSyncConnection(
+			KeyManager keyManager,
 			ConnectionRegistry connectionRegistry,
 			StreamReaderFactory streamReaderFactory,
 			StreamWriterFactory streamWriterFactory,
 			SyncSessionFactory syncSessionFactory,
 			TransportPropertyManager transportPropertyManager,
-			Executor ioExecutor, SecureRandom secureRandom, ContactId contactId,
+			Executor ioExecutor,
-			TransportId transportId, DuplexTransportConnection connection) {
+			SecureRandom secureRandom,
+			HandshakeManager handshakeManager,
+			ContactId contactId,
+			TransportId transportId,
+			DuplexTransportConnection connection) {
 		super(keyManager, connectionRegistry, streamReaderFactory,
 				streamWriterFactory, syncSessionFactory,
 				transportPropertyManager, ioExecutor, transportId, connection);
 		this.secureRandom = secureRandom;
+		this.handshakeManager = handshakeManager;
 		this.contactId = contactId;
 	}
 
@@ -56,10 +69,22 @@ class OutgoingDuplexSyncConnection extends DuplexSyncConnection
 			return;
 		}
 		if (ctx.isHandshakeMode()) {
-			// TODO: Support handshake mode for contacts
+			if (!performHandshake(ctx)) {
-			LOG.warning("Cannot use handshake mode stream context");
+				LOG.warning("Handshake failed");
-			onWriteError();
+				return;
-			return;
+			}
+			// Allocate a rotation mode stream context
+			ctx = allocateStreamContext(contactId, transportId);
+			if (ctx == null) {
+				LOG.warning("Could not allocate stream context");
+				onWriteError();
+				return;
+			}
+			if (ctx.isHandshakeMode()) {
+				LOG.warning("Got handshake mode context after handshaking");
+				onWriteError();
+				return;
+			}
 		}
 		// Start the incoming session on another thread
 		Priority priority = generatePriority();
@@ -127,6 +152,57 @@ class OutgoingDuplexSyncConnection extends DuplexSyncConnection
 		}
 	}
 
+	private boolean performHandshake(StreamContext ctxOut) {
+		// Flush the output stream to send the outgoing stream header
+		StreamWriter out;
+		try {
+			out = streamWriterFactory.createStreamWriter(
+					writer.getOutputStream(), ctxOut);
+			out.getOutputStream().flush();
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+			onWriteError();
+			return false;
+		}
+		// Read and recognise the tag
+		StreamContext ctxIn = recogniseTag(reader, transportId);
+		// Unrecognised tags are suspicious in this case
+		if (ctxIn == null) {
+			LOG.warning("Unrecognised tag for returning stream");
+			onReadError();
+			return false;
+		}
+		// Check that the stream comes from the expected contact
+		ContactId inContactId = ctxIn.getContactId();
+		if (contactId == null) {
+			LOG.warning("Expected contact tag, got rendezvous tag");
+			onReadError();
+			return false;
+		}
+		if (!inContactId.equals(contactId)) {
+			LOG.warning("Wrong contact ID for returning stream");
+			onReadError();
+			return false;
+		}
+		// TODO: Register the connection, close it if it's redundant
+		// Handshake and exchange contacts
+		try {
+			InputStream in = streamReaderFactory.createStreamReader(
+					reader.getInputStream(), ctxIn);
+			HandshakeManager.HandshakeResult result =
+					handshakeManager.handshake(contactId, in, out);
+			keyManager.addRotationKeys(contactId, result.getMasterKey(),
+					TIMESTAMP, result.isAlice(), true);
+			return true;
+		} catch (IOException | DbException e) {
+			logException(LOG, WARNING, e);
+			onWriteError();
+			return false;
+		} finally {
+			// TODO: Unregister the connection
+		}
+	}
+
 	private void onReadError() {
 		// 'Recognised' is always true for outgoing connections
 		onReadError(true);

bramble-core/src/main/java/org/briarproject/bramble/contact/ContactManagerImpl.java

@@ -119,6 +119,15 @@ class ContactManagerImpl implements ContactManager, EventListener {
 						verified, active));
 	}
 
+	@Override
+	public ContactId addContact(Transaction txn, Author remote, AuthorId local,
+			PublicKey handshake, boolean verified) throws DbException {
+		ContactId c = db.addContact(txn, remote, local, handshake, verified);
+		Contact contact = db.getContact(txn, c);
+		for (ContactHook hook : hooks) hook.addingContact(txn, contact);
+		return c;
+	}
+
 	@Override
 	public String getHandshakeLink() throws DbException {
 		KeyPair keyPair = db.transactionWithResult(true,

bramble-core/src/main/java/org/briarproject/bramble/contact/HandshakeManagerImpl.java

@@ -3,6 +3,8 @@ package org.briarproject.bramble.contact;
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.Predicate;
+import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.contact.HandshakeManager;
 import org.briarproject.bramble.api.contact.PendingContact;
@@ -88,6 +90,27 @@ class HandshakeManagerImpl implements HandshakeManager {
 		});
 		PublicKey theirStaticPublicKey = keys.getFirst();
 		KeyPair ourStaticKeyPair = keys.getSecond();
+		return handshake(theirStaticPublicKey, ourStaticKeyPair, in, out);
+	}
+
+	@Override
+	public HandshakeResult handshake(ContactId c, InputStream in,
+			StreamWriter out) throws DbException, IOException {
+		Pair<PublicKey, KeyPair> keys = db.transactionWithResult(true, txn -> {
+			Contact contact = contactManager.getContact(txn, c);
+			PublicKey handshakePublicKey = contact.getHandshakePublicKey();
+			if (handshakePublicKey == null) throw new DbException();
+			KeyPair keyPair = identityManager.getHandshakeKeys(txn);
+			return new Pair<>(handshakePublicKey, keyPair);
+		});
+		PublicKey theirStaticPublicKey = keys.getFirst();
+		KeyPair ourStaticKeyPair = keys.getSecond();
+		return handshake(theirStaticPublicKey, ourStaticKeyPair, in, out);
+	}
+
+	private HandshakeResult handshake(PublicKey theirStaticPublicKey,
+			KeyPair ourStaticKeyPair, InputStream in, StreamWriter out)
+			throws IOException {
 		boolean alice = transportCrypto.isAlice(theirStaticPublicKey,
 				ourStaticKeyPair);
 		RecordReader recordReader = recordReaderFactory.createRecordReader(in);

bramble-core/src/main/java/org/briarproject/bramble/transport/KeyManagerImpl.java

@@ -101,9 +101,9 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 	}
 
 	@Override
-	public Map<TransportId, KeySetId> addRotationKeys(
+	public Map<TransportId, KeySetId> addRotationKeys(Transaction txn,
-			Transaction txn, ContactId c, SecretKey rootKey, long timestamp,
+			ContactId c, SecretKey rootKey, long timestamp, boolean alice,
-			boolean alice, boolean active) throws DbException {
+			boolean active) throws DbException {
 		Map<TransportId, KeySetId> ids = new HashMap<>();
 		for (Entry<TransportId, TransportKeyManager> e : managers.entrySet()) {
 			TransportId t = e.getKey();
@@ -114,6 +114,14 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 		return ids;
 	}
 
+	@Override
+	public Map<TransportId, KeySetId> addRotationKeys(ContactId c,
+			SecretKey rootKey, long timestamp, boolean alice, boolean active)
+			throws DbException {
+		return db.transactionWithResult(false, txn ->
+				addRotationKeys(txn, c, rootKey, timestamp, alice, active));
+	}
+
 	@Override
 	public Map<TransportId, KeySetId> addContact(Transaction txn, ContactId c,
 			PublicKey theirPublicKey, KeyPair ourKeyPair)
@@ -137,7 +145,7 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 			PendingContactId p, PublicKey theirPublicKey, KeyPair ourKeyPair)
 			throws DbException, GeneralSecurityException {
 		SecretKey staticMasterKey = transportCrypto
-					.deriveStaticMasterKey(theirPublicKey, ourKeyPair);
+				.deriveStaticMasterKey(theirPublicKey, ourKeyPair);
 		SecretKey rootKey =
 				transportCrypto.deriveHandshakeRootKey(staticMasterKey, true);
 		boolean alice = transportCrypto.isAlice(theirPublicKey, ourKeyPair);

briar-android/src/main/AndroidManifest.xml

@@ -174,6 +174,14 @@
 				android:value="org.briarproject.briar.android.account.NewOrRecoverActivity" />
 		</activity>
 
+		<activity
+			android:name="org.briarproject.briar.android.socialbackup.recover.RestoreAccountActivity"
+			android:label="@string/activity_name_restore_account"
+			android:parentActivityName="org.briarproject.briar.android.socialbackup.recover.OwnerReturnShardActivity">
+			<meta-data
+				android:name="android.support.PARENT_ACTIVITY"
+				android:value="org.briarproject.briar.android.socialbackup.recover.OwnerReturnShardActivity" />
+		</activity>
 
 		<activity
 			android:name="org.briarproject.briar.android.conversation.ConversationActivity"

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

@@ -2,7 +2,7 @@ package org.briarproject.briar.android.account;
 
 import android.content.Context;
 
-interface DozeHelper {
+public interface DozeHelper {
 
 	boolean needToShowDozeFragment(Context context);
 }

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

@@ -14,7 +14,7 @@ import static org.briarproject.briar.android.util.UiUtils.needsDozeWhitelisting;
 
 @UiThread
 @NotNullByDefault
-class DozeView extends PowerView {
+public class DozeView extends PowerView {
 
 	@Nullable
 	private Runnable onButtonClickListener;

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

@@ -21,7 +21,7 @@ import static android.os.Build.VERSION.SDK_INT;
 
 @UiThread
 @NotNullByDefault
-class HuaweiView extends PowerView {
+public class HuaweiView extends PowerView {
 
 	private final static String PACKAGE_NAME = "com.huawei.systemmanager";
 	private final static String CLASS_NAME =

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

@@ -24,7 +24,7 @@ import static org.briarproject.briar.android.util.UiUtils.showOnboardingDialog;
 
 @UiThread
 @NotNullByDefault
-abstract class PowerView extends ConstraintLayout {
+public abstract class PowerView extends ConstraintLayout {
 
 	private final TextView textView;
 	private final ImageView checkImage;
@@ -156,7 +156,7 @@ abstract class PowerView extends ConstraintLayout {
 		};
 	}
 
-	interface OnCheckedChangedListener {
+	public interface OnCheckedChangedListener {
 		void onCheckedChanged();
 	}
 

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

@@ -29,6 +29,7 @@ import static org.briarproject.briar.android.account.SetupViewModel.State.SET_PA
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
+public
 class SetupViewModel extends AndroidViewModel {
 	enum State {AUTHOR_NAME, SET_PASSWORD, DOZE, CREATED, FAILED}
 

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

@@ -85,8 +85,10 @@ import org.briarproject.briar.android.socialbackup.CustodianSelectorFragment;
 import org.briarproject.briar.android.socialbackup.DistributedBackupActivity;
 import org.briarproject.briar.android.socialbackup.ExistingBackupFragment;
 import org.briarproject.briar.android.socialbackup.recover.CustodianReturnShardActivity;
+import org.briarproject.briar.android.socialbackup.recover.CustodianReturnShardErrorFragment;
 import org.briarproject.briar.android.socialbackup.recover.CustodianReturnShardFragment;
 import org.briarproject.briar.android.socialbackup.recover.CustodianReturnShardSuccessFragment;
+import org.briarproject.briar.android.socialbackup.recover.OwnerRecoveryModeErrorFragment;
 import org.briarproject.briar.android.socialbackup.recover.OwnerRecoveryModeExplainerFragment;
 import org.briarproject.briar.android.socialbackup.recover.OwnerRecoveryModeMainFragment;
 import org.briarproject.briar.android.socialbackup.recover.OwnerReturnShardActivity;
@@ -94,8 +96,13 @@ import org.briarproject.briar.android.socialbackup.recover.OwnerReturnShardFragm
 import org.briarproject.briar.android.socialbackup.ShardsSentFragment;
 import org.briarproject.briar.android.socialbackup.ThresholdSelectorFragment;
 import org.briarproject.briar.android.socialbackup.creation.CreateBackupModule;
+import org.briarproject.briar.android.socialbackup.recover.OwnerReturnShardSuccessFragment;
+import org.briarproject.briar.android.socialbackup.recover.RestoreAccountActivity;
+import org.briarproject.briar.android.socialbackup.recover.RestoreAccountDozeFragment;
+import org.briarproject.briar.android.socialbackup.recover.RestoreAccountSetPasswordFragment;
 import org.briarproject.briar.android.splash.SplashScreenActivity;
 import org.briarproject.briar.android.test.TestDataActivity;
+import org.briarproject.briar.api.socialbackup.recovery.RestoreAccount;
 
 import dagger.Component;
 
@@ -206,6 +213,8 @@ public interface ActivityComponent {
 
     void inject(OwnerRecoveryModeMainFragment ownerRecoveryModeMainFragment);
 
+    void inject(RestoreAccountActivity restoreAccountActivity);
+
 	// Fragments
 
 	void inject(AuthorNameFragment fragment);
@@ -287,4 +296,14 @@ public interface ActivityComponent {
 	void inject(OwnerReturnShardFragment ownerReturnShardFragment);
 
 	void inject(CustodianReturnShardSuccessFragment custodianReturnShardSuccessFragment);
+
+	void inject(RestoreAccountSetPasswordFragment restoreAccountSetPasswordFragment);
+
+	void inject(RestoreAccountDozeFragment restoreAccountDozeFragment);
+
+	void inject(OwnerReturnShardSuccessFragment ownerReturnShardSuccessFragment);
+
+	void inject(OwnerRecoveryModeErrorFragment ownerRecoveryModeErrorFragment);
+
+	void inject(CustodianReturnShardErrorFragment custodianReturnShardErrorFragment);
 }

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/CustodianReturnShardActivity.java

@@ -21,6 +21,7 @@ import javax.inject.Inject;
 import androidx.fragment.app.FragmentManager;
 import androidx.lifecycle.ViewModelProvider;
 
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
 
@@ -30,6 +31,7 @@ public class CustodianReturnShardActivity extends BriarActivity
 	private CustodianReturnShardViewModel viewModel;
 	private static final Logger LOG =
 			getLogger(CustodianReturnShardActivity.class.getName());
+	private ContactId contactId;
 
 	@Inject
 	ViewModelProvider.Factory viewModelFactory;
@@ -50,33 +52,61 @@ public class CustodianReturnShardActivity extends BriarActivity
 			Intent intent = getIntent();
 			int id = intent.getIntExtra(CONTACT_ID, -1);
 			if (id == -1) throw new IllegalStateException("No ContactId");
-			ContactId contactId = new ContactId(id);
+			contactId = new ContactId(id);
 
 			try {
 				viewModel.start(contactId);
-			} catch (IOException e) {
+//			} catch (IOException e) {
-				// TODO improve this
+//				// TODO improve this
-				Toast.makeText(this,
+//				Toast.makeText(this,
-						"It looks like you are not connected to a Wifi network",
+//						"It looks like you are not connected to a Wifi network",
-						Toast.LENGTH_SHORT).show();
+//						Toast.LENGTH_SHORT).show();
+//				showInitialFragment(new CustodianReturnShardErrorFragment());
 			} catch (DbException e) {
 				Toast.makeText(this,
 						"You do not hold a backup piece for this contact",
 						Toast.LENGTH_SHORT).show();
 				finish();
 			}
-			showInitialFragment(new CustodianRecoveryModeExplainerFragment());
 		}
+		showInitialFragment(new CustodianRecoveryModeExplainerFragment());
+
+		viewModel.getContinueClicked().observeEvent(this, clicked -> {
+			if (clicked) beginTransfer();
+		});
+
 		viewModel.getShowCameraFragment().observeEvent(this, show -> {
 			if (show) showCameraFragment();
 		});
 		viewModel.getSuccessDismissed().observeEvent(this, dismissed -> {
 			if (dismissed) finish();
 		});
+		viewModel.getErrorTryAgain().observeEvent(this, tryAgain -> {
+			if (tryAgain) beginTransfer();
+		});
 		viewModel.getState()
 				.observe(this, this::onReturnShardStateChanged);
 	}
 
+	private void beginTransfer() {
+		try {
+			viewModel.beginTransfer();
+		} catch (IOException e) {
+			Toast.makeText(this,
+					"It looks like you are not connected to a Wifi network",
+					Toast.LENGTH_SHORT).show();
+			FragmentManager fm = getSupportFragmentManager();
+			if (fm.findFragmentByTag(CustodianReturnShardFragment.TAG) == null) {
+				BaseFragment f = new CustodianReturnShardErrorFragment();
+				fm.beginTransaction()
+						.replace(R.id.fragmentContainer, f, f.getUniqueTag())
+						.addToBackStack(f.getUniqueTag())
+						.commit();
+			}
+		}
+	}
+
+
 	private void onReturnShardStateChanged(CustodianTask.State state) {
         if (state instanceof CustodianTask.State.Success) {
 	        CustodianReturnShardSuccessFragment fragment = new CustodianReturnShardSuccessFragment();

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/CustodianReturnShardErrorFragment.java

@@ -0,0 +1,57 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+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.fragment.BaseFragment;
+
+import javax.inject.Inject;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class CustodianReturnShardErrorFragment extends BaseFragment {
+	public static final String TAG =
+			CustodianReturnShardErrorFragment.class.getName();
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private CustodianReturnShardViewModel viewModel;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(CustodianReturnShardViewModel.class);
+	}
+
+	@Nullable
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		View view = inflater.inflate(R.layout.fragment_recovery_custodian_error_explainer,
+				container, false);
+		Button button = view.findViewById(R.id.button);
+		button.setOnClickListener(e -> viewModel.onErrorTryAgain());
+        // TODO cancel button
+//		button.setOnClickListener(e -> viewModel.onErrorCancelled());
+		return view;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+}

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/CustodianReturnShardViewModel.java

@@ -51,13 +51,14 @@ public class CustodianReturnShardViewModel extends AndroidViewModel
 	private final SocialBackupManager socialBackupManager;
 	private final DatabaseComponent db;
 	final QrCodeDecoder qrCodeDecoder;
-	private boolean wasContinueClicked = false;
 	private boolean qrCodeRead = false;
 	private WifiManager wifiManager;
+	private final MutableLiveEvent<Boolean > continueClicked = new MutableLiveEvent<>();
 	private final MutableLiveEvent<Boolean> showCameraFragment =
 			new MutableLiveEvent<>();
 	private final MutableLiveEvent<Boolean> successDismissed =
 			new MutableLiveEvent<>();
+	private final MutableLiveEvent<Boolean> errorTryAgain = new MutableLiveEvent<>();
 	private final MutableLiveData<CustodianTask.State> state =
 			new MutableLiveData<>();
 	private final CustodianTask task;
@@ -110,12 +111,8 @@ public class CustodianReturnShardViewModel extends AndroidViewModel
 		}
 	}
 
-	public void start(ContactId contactId) throws DbException, IOException {
+	public void start(ContactId contactId) throws DbException {
-		InetAddress inetAddress = getWifiIpv4Address();
+		// TODO this should be transactionWithResult
-		LOG.info("Client InetAddress: " + inetAddress);
-		if (inetAddress == null)
-			throw new IOException("Cannot get IP on local wifi");
-
 		db.transaction(false, txn -> {
 			if (!socialBackupManager.amCustodian(txn, contactId)) {
 				throw new DbException();
@@ -123,8 +120,6 @@ public class CustodianReturnShardViewModel extends AndroidViewModel
 			returnShardPayloadBytes = socialBackupManager
 					.getReturnShardPayloadBytes(txn, contactId);
 		});
-		task.cancel();
-		task.start(this, returnShardPayloadBytes);
 	}
 
 	@IoExecutor
@@ -149,11 +144,31 @@ public class CustodianReturnShardViewModel extends AndroidViewModel
 		}
 	}
 
+	public void beginTransfer() throws IOException {
+		InetAddress inetAddress = getWifiIpv4Address();
+		LOG.info("Client InetAddress: " + inetAddress);
+		if (inetAddress == null)
+			throw new IOException("Cannot get IP on local wifi");
+
+		task.cancel();
+		task.start(this, returnShardPayloadBytes);
+		//TODO camera permissions
+		showCameraFragment.setEvent(true);
+	}
 	@UiThread
 	public void onContinueClicked() {
-		wasContinueClicked = true;
+		continueClicked.setEvent(true);
 //		checkPermissions.setEvent(true);
-		showCameraFragment.setEvent(true);
+	}
+
+	@UiThread
+	public void onErrorCancelled() {
+		errorTryAgain.postEvent(false);
+	}
+
+	@UiThread
+	public void onErrorTryAgain() {
+		errorTryAgain.postEvent(true);
 	}
 
 	@UiThread
@@ -186,4 +201,10 @@ public class CustodianReturnShardViewModel extends AndroidViewModel
 			qrCodeRead = true;
 		}
 	}
+
+	public MutableLiveEvent<Boolean> getErrorTryAgain() {
+		return errorTryAgain;
+	}
+
+	public MutableLiveEvent<Boolean> getContinueClicked() { return continueClicked; }
 }

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/OwnerRecoveryModeErrorFragment.java

@@ -0,0 +1,57 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+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.fragment.BaseFragment;
+
+import javax.inject.Inject;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class OwnerRecoveryModeErrorFragment extends BaseFragment {
+	public static final String TAG =
+			OwnerRecoveryModeErrorFragment.class.getName();
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private OwnerReturnShardViewModel viewModel;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(OwnerReturnShardViewModel.class);
+	}
+
+	@Nullable
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		View view = inflater.inflate(R.layout.fragment_recovery_custodian_error_explainer,
+				container, false);
+		Button button = view.findViewById(R.id.button);
+		button.setOnClickListener(e -> viewModel.onErrorTryAgain());
+		// TODO cancel button
+//		button.setOnClickListener(e -> viewModel.onErrorCancelled());
+		return view;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+}

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/OwnerReturnShardActivity.java

@@ -1,5 +1,6 @@
 package org.briarproject.briar.android.socialbackup.recover;
 
+import android.content.Intent;
 import android.os.Bundle;
 import android.view.MenuItem;
 import android.widget.Toast;
@@ -23,6 +24,10 @@ import javax.inject.Inject;
 import androidx.fragment.app.FragmentManager;
 import androidx.lifecycle.ViewModelProvider;
 
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
+import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_TASK_ON_HOME;
 import static java.util.logging.Logger.getLogger;
 
 @MethodsNotNullByDefault
@@ -72,6 +77,12 @@ public class OwnerReturnShardActivity extends BaseActivity
 				showNextFragment(new OwnerRecoveryModeMainFragment());
 			}
 		});
+		viewModel.getSuccessDismissed().observeEvent(this, success -> {
+			if (success) onSuccessDismissed();
+		});
+		viewModel.getErrorTryAgain().observeEvent(this, tryAgain -> {
+			if (tryAgain) onBackPressed();
+		});
 		viewModel.getState()
 				.observe(this, this::onReturnShardStateChanged);
 	}
@@ -120,6 +131,13 @@ public class OwnerReturnShardActivity extends BaseActivity
 		}
 	}
 
+	private void onSuccessDismissed() {
+		finish();
+		Intent i = new Intent(this, RestoreAccountActivity.class);
+		i.addFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP |
+				FLAG_ACTIVITY_CLEAR_TASK | FLAG_ACTIVITY_TASK_ON_HOME);
+		startActivity(i);
+	}
 
 	private void onReturnShardStateChanged(SecretOwnerTask.State state) {
 		if (state instanceof SecretOwnerTask.State.Success) {
@@ -131,9 +149,8 @@ public class OwnerReturnShardActivity extends BaseActivity
 					Toast.LENGTH_SHORT).show();
 			if (added && viewModel.canRecover()) {
 				LOG.info("Secret key recovered");
-				int version = 0;
 				try {
-					version = viewModel.recover();
+					viewModel.recover();
 				} catch (GeneralSecurityException e) {
 					LOG.warning("Unable to decrypt backup" + e.toString());
 					Toast.makeText(this,
@@ -148,20 +165,16 @@ public class OwnerReturnShardActivity extends BaseActivity
 							Toast.LENGTH_LONG).show();
 					return;
 				}
-				Toast.makeText(this,
+				showNextFragment(new OwnerReturnShardSuccessFragment());
-						"Account recovered! " + version,
-						Toast.LENGTH_LONG).show();
-				finish();
 				return;
 			}
 			onBackPressed();
 		} else if (state instanceof SecretOwnerTask.State.Failure) {
-			// TODO error screen, handle reason
+//			Toast.makeText(this,
-			Toast.makeText(this,
+//					"Shard return failed!",
-					"Shard return failed!",
+//					Toast.LENGTH_SHORT).show();
-					Toast.LENGTH_SHORT).show();
+//			onBackPressed();
-			onBackPressed();
+			showNextFragment(new OwnerRecoveryModeErrorFragment());
-//			showNextFragment(new OwnerRecoveryModeExplainerFragment());
 		}
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/OwnerReturnShardFragment.java

@@ -68,7 +68,7 @@ public class OwnerReturnShardFragment extends BaseFragment
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		return inflater.inflate(R.layout.fragment_keyagreement_qr, container,
+		return inflater.inflate(R.layout.fragment_recovery_owner_qr, container,
 				false);
 	}
 
@@ -134,13 +134,13 @@ public class OwnerReturnShardFragment extends BaseFragment
 	private void onReturnShardStateChanged(
 			@Nullable SecretOwnerTask.State state) {
 		if (state instanceof SecretOwnerTask.State.Listening) {
+			status.setText(R.string.waiting_for_contact_to_scan);
 			Bitmap qrCode = viewModel.getQrCodeBitmap();
 			qrCodeView.setQrCode(qrCode);
 		} else if (state instanceof SecretOwnerTask.State.ReceivingShard) {
-			statusView.setVisibility(VISIBLE);
 			status.setText(R.string.connecting_to_device);
 		} else if (state instanceof SecretOwnerTask.State.SendingAck) {
-			status.setText(R.string.waiting_for_contact_to_scan);
+			status.setText(R.string.recovery_sending_ack);
 		} else if (state instanceof SecretOwnerTask.State.Success) {
 			status.setText("Success");
 		} else if (state instanceof SecretOwnerTask.State.Failure) {

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/OwnerReturnShardModule.java

@@ -1,6 +1,7 @@
 package org.briarproject.briar.android.socialbackup.recover;
 
 import org.briarproject.briar.android.viewmodel.ViewModelKey;
+import org.briarproject.briar.api.socialbackup.recovery.RestoreAccount;
 
 import androidx.lifecycle.ViewModel;
 import dagger.Binds;
@@ -17,4 +18,9 @@ public abstract class OwnerReturnShardModule {
 	abstract ViewModel bindOwnerReturnShardViewModel(
 			OwnerReturnShardViewModel ownerReturnShardViewModel);
 
+	@Binds
+	@IntoMap
+	@ViewModelKey(RestoreAccountViewModel.class)
+	abstract ViewModel bindRestoreAccountViewModel(
+			RestoreAccountViewModel restoreAccountViewModel);
 }

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/OwnerReturnShardSuccessFragment.java

@@ -0,0 +1,54 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.fragment.BaseFragment;
+
+import javax.inject.Inject;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
+
+public class OwnerReturnShardSuccessFragment extends BaseFragment {
+
+	public static final String TAG =
+			OwnerReturnShardSuccessFragment.class.getName();
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private OwnerReturnShardViewModel viewModel;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(OwnerReturnShardViewModel.class);
+	}
+
+	@Nullable
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		View view = inflater.inflate(R.layout.fragment_recovery_owner_success,
+				container, false);
+
+		Button button = view.findViewById(R.id.button);
+		button.setOnClickListener(e -> viewModel.onSuccessDismissed());
+
+		return view;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+}

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/OwnerReturnShardViewModel.java

@@ -14,19 +14,14 @@ import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.android.contact.add.nearby.QrCodeUtils;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
-import org.briarproject.briar.api.socialbackup.BackupPayload;
-import org.briarproject.briar.api.socialbackup.DarkCrystal;
 import org.briarproject.briar.api.socialbackup.ReturnShardPayload;
-import org.briarproject.briar.api.socialbackup.Shard;
+import org.briarproject.briar.api.socialbackup.recovery.RestoreAccount;
 import org.briarproject.briar.api.socialbackup.recovery.SecretOwnerTask;
-import org.briarproject.briar.socialbackup.BackupPayloadDecoder;
-import org.briarproject.briar.socialbackup.SocialBackup;
 
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.nio.charset.Charset;
 import java.security.GeneralSecurityException;
-import java.util.ArrayList;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
@@ -51,23 +46,22 @@ class OwnerReturnShardViewModel extends AndroidViewModel
 	@SuppressWarnings("CharsetObjectCanBeUsed") // Requires minSdkVersion >= 19
 	private static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
 
-//	private ReturnShardPayload returnShardPayload;
-
 	private final AndroidExecutor androidExecutor;
 	private final Executor ioExecutor;
 	private final SecretOwnerTask task;
-	private final DarkCrystal darkCrystal;
+	private final RestoreAccount restoreAccount;
-	private final BackupPayloadDecoder backupPayloadDecoder;
 
+	private final MutableLiveEvent<Boolean> errorTryAgain =
+			new MutableLiveEvent<>();
 	private final MutableLiveEvent<Boolean> showQrCodeFragment =
 			new MutableLiveEvent<>();
+	private final MutableLiveEvent<Boolean> successDismissed = new MutableLiveEvent<>();
 	private final MutableLiveData<SecretOwnerTask.State> state =
 			new MutableLiveData<>();
 	private final MutableLiveEvent<Boolean> startClicked =
 			new MutableLiveEvent<>();
 	private boolean wasContinueClicked = false;
 	private boolean isActivityResumed = false;
-	private ArrayList<ReturnShardPayload> recoveredShards = new ArrayList<>();
 	private Bitmap qrCodeBitmap;
 	private WifiManager wifiManager;
 	private SecretKey secretKey;
@@ -76,14 +70,12 @@ class OwnerReturnShardViewModel extends AndroidViewModel
 	OwnerReturnShardViewModel(Application app,
 			AndroidExecutor androidExecutor,
 			SecretOwnerTask task,
-			DarkCrystal darkCrystal,
+			RestoreAccount restoreAccount,
-			BackupPayloadDecoder backupPayloadDecoder,
 			@IoExecutor Executor ioExecutor) {
 		super(app);
 		this.androidExecutor = androidExecutor;
 		this.ioExecutor = ioExecutor;
-		this.backupPayloadDecoder = backupPayloadDecoder;
+		this.restoreAccount = restoreAccount;
-		this.darkCrystal = darkCrystal;
 		this.task = task;
 		wifiManager = (WifiManager) app.getSystemService(WIFI_SERVICE);
 
@@ -132,6 +124,11 @@ class OwnerReturnShardViewModel extends AndroidViewModel
 		startShardReturn();
 	}
 
+	@UiThread
+	void onSuccessDismissed() {
+	   successDismissed.setEvent(true);
+	}
+
 	@UiThread
 	void startShardReturn() {
 		// If we return to the intro fragment, the continue button needs to be
@@ -163,6 +160,10 @@ class OwnerReturnShardViewModel extends AndroidViewModel
 		});
 	}
 
+	@UiThread
+	public void onErrorTryAgain() {
+	     errorTryAgain.setEvent(true);
+	}
 
 	/**
 	 * Set to true in onPostResume() and false in onPause(). This prevents the
@@ -196,7 +197,7 @@ class OwnerReturnShardViewModel extends AndroidViewModel
 	}
 
 	public int getNumberOfShards() {
-		return recoveredShards.size();
+		return restoreAccount.getNumberOfShards();
 	}
 
 	@Override
@@ -227,38 +228,22 @@ class OwnerReturnShardViewModel extends AndroidViewModel
 
 	// TODO figure out how to actually use a hash set for these objects
 	public boolean addToShardSet(ReturnShardPayload toAdd) {
-		boolean found = false;
+		return restoreAccount.addReturnShardPayload(toAdd);
-		for (ReturnShardPayload returnShardPayload : recoveredShards) {
-			if (toAdd.equals(returnShardPayload)) {
-				found = true;
-				break;
-			}
-		}
-		if (!found) recoveredShards.add(toAdd);
-		return !found;
 	}
 
 	public boolean canRecover() {
-        ArrayList<Shard> shards = new ArrayList();
+		return restoreAccount.canRecover();
-		for (ReturnShardPayload returnShardPayload : recoveredShards) {
-			// TODO check shards all have same secret id
-		   shards.add(returnShardPayload.getShard());
-		}
-		try {
-			secretKey = darkCrystal.combineShards(shards);
-		} catch (GeneralSecurityException e) {
-			// TODO handle error message
-			return false;
-		}
-		return true;
 	}
 
 	public int recover() throws FormatException, GeneralSecurityException {
-		if (secretKey == null) throw new GeneralSecurityException();
+		return restoreAccount.recover();
-		// TODO find backup with highest version number
+	}
-		BackupPayload backupPayload = recoveredShards.get(0).getBackupPayload();
+
-		SocialBackup decodedBackup = backupPayloadDecoder.decodeBackupPayload(secretKey, backupPayload);
+	public MutableLiveEvent<Boolean> getSuccessDismissed() {
-		int version = decodedBackup.getVersion();
+		return successDismissed;
-		return version;
+	}
+
+	public MutableLiveEvent<Boolean> getErrorTryAgain() {
+		return errorTryAgain;
 	}
 }

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/RestoreAccountActivity.java

@@ -0,0 +1,81 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.annotation.TargetApi;
+import android.content.Intent;
+import android.os.Bundle;
+
+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.BaseActivity;
+import org.briarproject.briar.android.fragment.BaseFragment;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import androidx.lifecycle.ViewModelProvider;
+
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
+import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_TASK_ON_HOME;
+import static org.briarproject.briar.android.BriarApplication.ENTRY_ACTIVITY;
+import static org.briarproject.briar.android.socialbackup.recover.RestoreAccountViewModel.State;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class RestoreAccountActivity extends BaseActivity
+		implements BaseFragment.BaseFragmentListener {
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+	RestoreAccountViewModel viewModel;
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+
+		viewModel = new ViewModelProvider(this, viewModelFactory)
+				.get(RestoreAccountViewModel.class);
+		viewModel.getState().observeEvent(this, this::onStateChanged);
+	}
+
+	@Override
+	public void onCreate(@Nullable Bundle state) {
+		super.onCreate(state);
+		setContentView(R.layout.activity_fragment_container);
+	}
+
+	private void onStateChanged(RestoreAccountViewModel.State state) {
+		if (state == State.SET_PASSWORD) {
+			showInitialFragment(RestoreAccountSetPasswordFragment.newInstance());
+		} else if (state == State.DOZE) {
+			showDozeFragment();
+		} else if (state == State.CREATED || state == State.FAILED) {
+			// TODO: Show an error if failed
+			showApp();
+		}
+	}
+
+	@TargetApi(23)
+	void showDozeFragment() {
+		showNextFragment(RestoreAccountDozeFragment.newInstance());
+	}
+
+	void showApp() {
+		Intent i = new Intent(this, ENTRY_ACTIVITY);
+		i.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_TASK_ON_HOME |
+				FLAG_ACTIVITY_CLEAR_TASK | FLAG_ACTIVITY_CLEAR_TOP);
+		startActivity(i);
+		supportFinishAfterTransition();
+		overridePendingTransition(R.anim.screen_new_in, R.anim.screen_old_out);
+	}
+
+	@Override
+	@Deprecated
+	public void runOnDbThread(Runnable runnable) {
+		throw new RuntimeException("Don't use this deprecated method here.");
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/RestoreAccountDozeFragment.java

@@ -0,0 +1,118 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.annotation.SuppressLint;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.ProgressBar;
+
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.account.DozeView;
+import org.briarproject.briar.android.account.HuaweiView;
+import org.briarproject.briar.android.account.PowerView;
+import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.util.UiUtils;
+
+import androidx.annotation.Nullable;
+
+import static android.view.View.INVISIBLE;
+import static android.view.View.VISIBLE;
+import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_DOZE_WHITELISTING;
+import static org.briarproject.briar.android.util.UiUtils.showOnboardingDialog;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class RestoreAccountDozeFragment extends RestoreAccountFragment
+		implements PowerView.OnCheckedChangedListener {
+
+	private final static String TAG = RestoreAccountDozeFragment.class.getName();
+
+	private DozeView dozeView;
+	private HuaweiView huaweiView;
+	private Button next;
+	private boolean secondAttempt = false;
+
+	public static RestoreAccountDozeFragment newInstance() {
+		return new RestoreAccountDozeFragment();
+	}
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public View onCreateView(LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		requireActivity().setTitle(getString(R.string.setup_doze_title));
+		setHasOptionsMenu(false);
+		View v = inflater.inflate(R.layout.fragment_setup_doze, container,
+				false);
+		dozeView = v.findViewById(R.id.dozeView);
+		dozeView.setOnCheckedChangedListener(this);
+		huaweiView = v.findViewById(R.id.huaweiView);
+		huaweiView.setOnCheckedChangedListener(this);
+		next = v.findViewById(R.id.next);
+		ProgressBar progressBar = v.findViewById(R.id.progress);
+
+		dozeView.setOnButtonClickListener(this::askForDozeWhitelisting);
+		next.setOnClickListener(this);
+
+		viewModel.getIsCreatingAccount()
+				.observe(getViewLifecycleOwner(), isCreatingAccount -> {
+					if (isCreatingAccount) {
+						next.setVisibility(INVISIBLE);
+						progressBar.setVisibility(VISIBLE);
+					}
+				});
+
+		return v;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+	@Override
+	protected String getHelpText() {
+		return getString(R.string.setup_doze_explanation);
+	}
+
+	@Override
+	public void onActivityResult(int request, int result,
+			@Nullable Intent data) {
+		super.onActivityResult(request, result, data);
+		if (request == REQUEST_DOZE_WHITELISTING) {
+			if (!dozeView.needsToBeShown() || secondAttempt) {
+				dozeView.setChecked(true);
+			} else if (getContext() != null) {
+				secondAttempt = true;
+				showOnboardingDialog(getContext(), getHelpText());
+			}
+		}
+	}
+
+	@Override
+	public void onCheckedChanged() {
+		next.setEnabled(dozeView.isChecked() && huaweiView.isChecked());
+	}
+
+	@SuppressLint("BatteryLife")
+	private void askForDozeWhitelisting() {
+		if (getContext() == null) return;
+		Intent i = UiUtils.getDozeWhitelistingIntent(getContext());
+		startActivityForResult(i, REQUEST_DOZE_WHITELISTING);
+	}
+
+	@Override
+	public void onClick(View view) {
+		viewModel.dozeExceptionConfirmed();
+	}
+}

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/RestoreAccountFragment.java

@@ -0,0 +1,91 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.view.KeyEvent;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.TextView;
+
+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 javax.inject.Inject;
+
+import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
+
+import static android.view.inputmethod.EditorInfo.IME_ACTION_DONE;
+import static android.view.inputmethod.EditorInfo.IME_ACTION_NEXT;
+import static org.briarproject.briar.android.util.UiUtils.enterPressed;
+import static org.briarproject.briar.android.util.UiUtils.showOnboardingDialog;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+abstract class RestoreAccountFragment extends BaseFragment implements TextWatcher,
+		TextView.OnEditorActionListener, View.OnClickListener {
+
+	private final static String STATE_KEY_CLICKED = "setupFragmentClicked";
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+	RestoreAccountViewModel viewModel;
+
+	@Override
+	public void onCreate(@Nullable Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		viewModel = new ViewModelProvider(requireActivity())
+				.get(RestoreAccountViewModel.class);
+	}
+
+	@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) {
+			showOnboardingDialog(getContext(), getHelpText());
+			return true;
+		} else {
+			return super.onOptionsItemSelected(item);
+		}
+	}
+
+	protected abstract String getHelpText();
+
+	@Override
+	public void beforeTextChanged(CharSequence s, int start, int count,
+			int after) {
+		// noop
+	}
+
+	@Override
+	public void onTextChanged(CharSequence s, int start, int before,
+			int count) {
+		// noop
+	}
+
+	@Override
+	public boolean onEditorAction(TextView textView, int actionId,
+			@Nullable KeyEvent keyEvent) {
+		if (actionId == IME_ACTION_NEXT || actionId == IME_ACTION_DONE ||
+				enterPressed(actionId, keyEvent)) {
+			onClick(textView);
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public void afterTextChanged(Editable editable) {
+		// noop
+	}
+}

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/RestoreAccountSetPasswordFragment.java

@@ -0,0 +1,131 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.os.Bundle;
+import android.os.IBinder;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
+import android.widget.ProgressBar;
+
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
+
+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.login.StrengthMeter;
+
+import javax.annotation.Nullable;
+
+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 org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_WEAK;
+import static org.briarproject.briar.android.util.UiUtils.setError;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class RestoreAccountSetPasswordFragment extends RestoreAccountFragment {
+	private final static String TAG = RestoreAccountSetPasswordFragment.class.getName();
+
+	private TextInputLayout passwordEntryWrapper;
+	private TextInputLayout passwordConfirmationWrapper;
+	private TextInputEditText passwordEntry;
+	private TextInputEditText passwordConfirmation;
+	private StrengthMeter strengthMeter;
+	private Button nextButton;
+
+	public static RestoreAccountSetPasswordFragment newInstance() {
+		return new RestoreAccountSetPasswordFragment();
+	}
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public View onCreateView(LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		requireActivity().setTitle(getString(R.string.setup_password_intro));
+		View v = inflater.inflate(R.layout.fragment_setup_password, container,
+				false);
+
+		strengthMeter = v.findViewById(R.id.strength_meter);
+		passwordEntryWrapper = v.findViewById(R.id.password_entry_wrapper);
+		passwordEntry = v.findViewById(R.id.password_entry);
+		passwordConfirmationWrapper =
+				v.findViewById(R.id.password_confirm_wrapper);
+		passwordConfirmation = v.findViewById(R.id.password_confirm);
+		nextButton = v.findViewById(R.id.next);
+		ProgressBar progressBar = v.findViewById(R.id.progress);
+
+		passwordEntry.addTextChangedListener(this);
+		passwordConfirmation.addTextChangedListener(this);
+		nextButton.setOnClickListener(this);
+
+		if (!viewModel.needToShowDozeFragment()) {
+			nextButton.setText(R.string.create_account_button);
+			passwordConfirmation.setImeOptions(IME_ACTION_DONE);
+		}
+
+		viewModel.getIsCreatingAccount()
+				.observe(getViewLifecycleOwner(), isCreatingAccount -> {
+					if (isCreatingAccount) {
+						nextButton.setVisibility(INVISIBLE);
+						progressBar.setVisibility(VISIBLE);
+						// this also avoids the keyboard popping up
+						passwordEntry.setFocusable(false);
+						passwordConfirmation.setFocusable(false);
+					}
+				});
+
+		return v;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+	@Override
+	protected String getHelpText() {
+		return getString(R.string.setup_password_explanation);
+	}
+
+	@Override
+	public void onTextChanged(CharSequence authorName, int i, int i1, int i2) {
+		String password1 = passwordEntry.getText().toString();
+		String password2 = passwordConfirmation.getText().toString();
+		boolean passwordsMatch = password1.equals(password2);
+
+		strengthMeter
+				.setVisibility(password1.length() > 0 ? VISIBLE : INVISIBLE);
+		float strength = viewModel.estimatePasswordStrength(password1);
+		strengthMeter.setStrength(strength);
+		boolean strongEnough = strength >= QUITE_WEAK;
+
+		setError(passwordEntryWrapper, getString(R.string.password_too_weak),
+				password1.length() > 0 && !strongEnough);
+		setError(passwordConfirmationWrapper,
+				getString(R.string.passwords_do_not_match),
+				password2.length() > 0 && !passwordsMatch);
+
+		boolean enabled = passwordsMatch && strongEnough;
+		nextButton.setEnabled(enabled);
+		passwordConfirmation.setOnEditorActionListener(enabled ? this : null);
+	}
+
+	@Override
+	public void onClick(View view) {
+		IBinder token = passwordEntry.getWindowToken();
+		Object o = getContext().getSystemService(INPUT_METHOD_SERVICE);
+		((InputMethodManager) o).hideSoftInputFromWindow(token, 0);
+		viewModel.setPassword(passwordEntry.getText().toString());
+	}
+}

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/RestoreAccountViewModel.java

@@ -0,0 +1,133 @@
+package org.briarproject.briar.android.socialbackup.recover;
+
+import android.app.Application;
+
+import org.briarproject.bramble.api.account.AccountManager;
+import org.briarproject.bramble.api.contact.ContactManager;
+import org.briarproject.bramble.api.crypto.PasswordStrengthEstimator;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.identity.Identity;
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.android.account.DozeHelper;
+import org.briarproject.briar.android.viewmodel.LiveEvent;
+import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
+import org.briarproject.briar.api.socialbackup.SocialBackup;
+import org.briarproject.briar.api.socialbackup.recovery.RestoreAccount;
+
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import androidx.annotation.Nullable;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
+import static java.util.logging.Logger.getLogger;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class RestoreAccountViewModel extends AndroidViewModel {
+
+	enum State {SET_PASSWORD, DOZE, CREATED, FAILED}
+
+	private static final Logger LOG =
+			getLogger(RestoreAccountViewModel.class.getName());
+
+	@Nullable
+	private String password;
+	private final MutableLiveEvent<State>
+			state = new MutableLiveEvent<>();
+	private final MutableLiveData<Boolean> isCreatingAccount =
+			new MutableLiveData<>(false);
+
+	private final AccountManager accountManager;
+	private final ContactManager contactManager;
+	private final Executor ioExecutor;
+	private final PasswordStrengthEstimator strengthEstimator;
+	private final DozeHelper dozeHelper;
+	private final RestoreAccount restoreAccount;
+
+	@Inject
+	RestoreAccountViewModel(Application app,
+			AccountManager accountManager,
+			ContactManager contactManager,
+			RestoreAccount restoreAccount,
+			@IoExecutor Executor ioExecutor,
+			PasswordStrengthEstimator strengthEstimator,
+			DozeHelper dozeHelper) {
+		super(app);
+		this.accountManager = accountManager;
+		this.contactManager = contactManager;
+		this.ioExecutor = ioExecutor;
+		this.strengthEstimator = strengthEstimator;
+		this.dozeHelper = dozeHelper;
+		this.restoreAccount = restoreAccount;
+
+		ioExecutor.execute(() -> {
+			if (accountManager.accountExists()) {
+				throw new AssertionError();
+			} else {
+				state.postEvent(State.SET_PASSWORD);
+			}
+		});
+	}
+
+	LiveEvent<State> getState() {
+		return state;
+	}
+
+	LiveData<Boolean> getIsCreatingAccount() {
+		return isCreatingAccount;
+	}
+
+	void setPassword(String password) {
+		this.password = password;
+		if (needToShowDozeFragment()) {
+			state.setEvent(State.DOZE);
+		} else {
+			createAccount();
+		}
+	}
+
+	float estimatePasswordStrength(String password) {
+		return strengthEstimator.estimateStrength(password);
+	}
+
+	boolean needToShowDozeFragment() {
+		return dozeHelper.needToShowDozeFragment(getApplication());
+	}
+
+	void dozeExceptionConfirmed() {
+		createAccount();
+	}
+
+	private void createAccount() {
+		if (password == null) throw new IllegalStateException();
+		isCreatingAccount.setValue(true);
+		SocialBackup socialBackup = restoreAccount.getSocialBackup();
+		if (socialBackup == null) {
+			LOG.warning("Cannot retrieve social backup");
+			state.postEvent(State.FAILED);
+		}
+		Identity identity = socialBackup.getIdentity();
+		ioExecutor.execute(() -> {
+			if (accountManager.restoreAccount(identity, password)) {
+				LOG.info("Restored account");
+				try {
+					restoreAccount.addContactsToDb();
+				} catch (DbException e) {
+					LOG.warning("Cannot retrieve social backup");
+					state.postEvent(State.FAILED);
+				}
+				state.postEvent(State.CREATED);
+			} else {
+				LOG.warning("Failed to create account");
+				state.postEvent(State.FAILED);
+			}
+		});
+	}
+}

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

@@ -0,0 +1,24 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="409dp"
+        android:height="162dp"
+        android:viewportHeight="161.7"
+        android:viewportWidth="409.2">
+	<path
+		android:fillColor="#FF000000"
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+		android:pathData="M80.5,63h2.3v2.3h2.3v2.3L73.6,67.6v-2.3h2.3v-4.6h4.6L80.5,63L80.5,63zM110.5,83.8h2.3v-2.3h-2.3L110.5,83.8zM82.8,63h2.3v-2.3h-2.3L82.8,63zM115.1,83.8h2.3v-2.3h-2.3L115.1,83.8zM87.4,86.1L92,86.1L92,83.8h-4.6L87.4,86.1zM108.2,86.1L108.2,83.8h-2.3v2.3L108.2,86.1zM99,86.1h2.3v-4.6L99,81.5L99,86.1zM80.5,56.1v2.3h6.9v-2.3L80.5,56.1zM78.2,58.4v-2.3h-4.6v4.6h2.3v-2.3L78.2,58.4zM85.1,53.8L69,53.8v-16.1h16.1L85.1,53.8zM82.8,40L71.3,40v11.5h11.5L82.8,40zM73.6,81.5h6.9v-6.9h-6.9L73.6,81.5zM96.6,79.1v2.3L99,81.4v-2.3L96.6,79.1zM80.5,42.3h-6.9v6.9h6.9L80.5,42.3zM117.4,37.7L117.4,53.8L101.3,53.8v-16.1L117.4,37.7zM115.1,40L103.6,40v11.5h11.5L115.1,40zM69,69.9h16.1v16.1L69,86L69,69.9zM71.3,83.8h11.5v-11.5L71.3,72.3L71.3,83.8zM71.3,56.1L69,56.1v11.5h2.3L71.3,56.1zM101.3,67.6v2.3h2.3v-2.3L101.3,67.6zM94.3,76.9v-2.3L92,74.6v2.3h-4.6v4.6L92,81.5v2.3h2.3v-4.6h2.3v-2.3L94.3,76.9zM87.4,46.9L92,46.9v-2.3h-4.6L87.4,46.9zM105.9,65.3h4.6v2.3h2.3v-6.9h-2.3v-4.6h-2.3v6.9h-6.9v2.3h2.3v2.3h2.3L105.9,65.3zM108.2,72.2h-2.3v-2.3h-2.3v4.6h-6.9v2.3h4.6v4.6h2.3v2.3h2.3v-4.6h9.2v-2.3h-6.9L108.2,72.2zM108.2,72.2h2.3v-4.6h-2.3L108.2,72.2zM89.7,72.2v-2.3L92,69.9v-2.3h2.3v-2.3h2.3v-4.6h6.9v-4.6h-2.3v2.3L99,58.4v-9.2h-2.3v-4.6L99,44.6v-6.9h-2.3v4.6h-2.3v-4.6h-6.9v4.6h2.3v-2.3L92,40v4.6h2.3v6.9h2.3v2.3h-2.3v4.6L92,58.4L92,53.8h-2.3v-2.3h-2.3v4.6h2.3v2.3h-2.3v6.9h2.3v-4.6L92,60.7v4.6h-2.3v2.3h-2.3v6.9L92,74.5v-2.3L89.7,72.2zM115.1,74.5v-2.3h-4.6v2.3L115.1,74.5zM112.8,42.3h-6.9v6.9h6.9L112.8,42.3zM94.3,72.2L99,72.2v-2.3h-2.3v-2.3h-2.3L94.4,72.2zM99,67.6v-2.3h-2.3v2.3L99,67.6zM112.8,58.4h4.6v-2.3h-4.6L112.8,58.4zM115.1,76.9h2.3v-2.3h-2.3L115.1,76.9zM115.1,63h2.3v-2.3h-2.3L115.1,63zM94.3,51.5L92,51.5v2.3h2.3L94.3,51.5zM94.3,51.5"/>
+<!--	<path-->
+<!--		android:fillColor="#FF000000"-->
+<!--		android:pathData="M303.5,63h2.3v2.3h2.3v2.3h-11.5v-2.3h2.3v-4.6h4.6L303.5,63L303.5,63zM333.5,83.8h2.3v-2.3h-2.3L333.5,83.8zM305.8,63h2.3v-2.3h-2.3L305.8,63zM338.1,83.8h2.3v-2.3h-2.3L338.1,83.8zM310.4,86.1h4.6L315,83.8h-4.6L310.4,86.1zM331.2,86.1L331.2,83.8h-2.3v2.3L331.2,86.1zM322,86.1h2.3v-4.6L322,81.5L322,86.1zM303.5,56.1v2.3h6.9v-2.3L303.5,56.1zM301.2,58.4v-2.3h-4.6v4.6h2.3v-2.3L301.2,58.4zM308.1,53.8L292,53.8v-16.1h16.1L308.1,53.8zM305.8,40h-11.5v11.5h11.5L305.8,40zM296.6,81.5h6.9v-6.9h-6.9L296.6,81.5zM319.6,79.1v2.3h2.3v-2.3L319.6,79.1zM303.5,42.3h-6.9v6.9h6.9L303.5,42.3zM340.4,37.7L340.4,53.8h-16.1v-16.1L340.4,37.7zM338.1,40h-11.5v11.5h11.5L338.1,40zM292,69.9h16.1v16.1L292,86L292,69.9zM294.3,83.8h11.5v-11.5h-11.5L294.3,83.8zM294.3,56.1L292,56.1v11.5h2.3L294.3,56.1zM324.3,67.6v2.3h2.3v-2.3L324.3,67.6zM317.3,76.9v-2.3L315,74.6v2.3h-4.6v4.6h4.6v2.3h2.3v-4.6h2.3v-2.3L317.3,76.9zM310.4,46.9h4.6v-2.3h-4.6L310.4,46.9zM328.9,65.3h4.6v2.3h2.3v-6.9h-2.3v-4.6h-2.3v6.9h-6.9v2.3h2.3v2.3h2.3L328.9,65.3zM331.2,72.2h-2.3v-2.3h-2.3v4.6h-6.9v2.3h4.6v4.6h2.3v2.3h2.3v-4.6h9.2v-2.3h-6.9L331.2,72.2zM331.2,72.2h2.3v-4.6h-2.3L331.2,72.2zM312.7,72.2v-2.3h2.3v-2.3h2.3v-2.3h2.3v-4.6h6.9v-4.6h-2.3v2.3L322,58.4v-9.2h-2.3v-4.6h2.3v-6.9h-2.3v4.6h-2.3v-4.6h-6.9v4.6h2.3v-2.3h2.3v4.6h2.3v6.9h2.3v2.3h-2.3v4.6L315,58.4L315,53.8h-2.3v-2.3h-2.3v4.6h2.3v2.3h-2.3v6.9h2.3v-4.6h2.3v4.6h-2.3v2.3h-2.3v6.9h4.6v-2.3L312.7,72.2zM338.1,74.5v-2.3h-4.6v2.3L338.1,74.5zM335.8,42.3h-6.9v6.9h6.9L335.8,42.3zM317.3,72.2h4.6v-2.3h-2.3v-2.3h-2.3L317.3,72.2zM322,67.6v-2.3h-2.3v2.3L322,67.6zM335.8,58.4h4.6v-2.3h-4.6L335.8,58.4zM338.1,76.9h2.3v-2.3h-2.3L338.1,76.9zM338.1,63h2.3v-2.3h-2.3L338.1,63zM317.3,51.5L315,51.5v2.3h2.3L317.3,51.5zM317.3,51.5"/>-->
+	<path
+		android:fillColor="#000000"
+		android:pathData="M 207.61295,88.782357 h -6.42588 v -12.85177 h 6.42588 m 0,25.703533 h -6.42588 v -6.425883 h 6.42588 m -38.5553,16.064713 h 70.68472 L 204.40001,50.227047 Z"
+		android:strokeWidth="3.21294165"/>
+</vector>

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

@@ -31,7 +31,7 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/textView1"
-		app:srcCompat="@drawable/qr_code_error" />
+		app:srcCompat="@drawable/qr_code_social_backup_error" />
 
 	<TextView
 		android:id="@+id/textView2"

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

@@ -31,7 +31,20 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/textView"
-		app:srcCompat="@drawable/qr_code_intro" />
+		app:srcCompat="@drawable/qr_code_social_backup" />
+
+	<TextView
+		android:id="@+id/textViewExplain"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="24dp"
+		android:gravity="center"
+		android:text="@string/custodian_recovery_explainer_extra"
+		android:textSize="20sp"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/imageView"
+		tools:layout_editor_absoluteX="16dp" />
 
 	<Button
 		android:id="@+id/button"
@@ -42,6 +55,6 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintHorizontal_bias="0.0"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/imageView" />
+		app:layout_constraintTop_toBottomOf="@+id/textViewExplain" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -31,7 +31,21 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/textView"
-		app:srcCompat="@drawable/qr_code_intro" />
+		app:srcCompat="@drawable/qr_code_social_backup" />
+
+	<TextView
+		android:id="@+id/textViewExplain"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="24dp"
+		android:gravity="center"
+		android:text="@string/recovery_explainer_extra"
+		android:textSize="20sp"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintHorizontal_bias="0.0"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/imageView"
+		tools:layout_editor_absoluteX="16dp" />
 
 	<Button
 		android:id="@+id/beginButton"
@@ -42,6 +56,6 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintHorizontal_bias="0.0"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/imageView" />
+		app:layout_constraintTop_toBottomOf="@+id/textViewExplain" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:keepScreenOn="true">
+
+<!--	<org.briarproject.briar.android.contact.add.nearby.CameraView-->
+<!--		android:id="@+id/camera_view"-->
+<!--		android:layout_width="match_parent"-->
+<!--		android:layout_height="match_parent" />-->
+
+	<LinearLayout
+		android:id="@+id/camera_overlay"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		android:baselineAligned="false"
+		android:orientation="vertical">
+
+		<LinearLayout
+			android:id="@+id/status_container"
+			android:layout_width="match_parent"
+			android:layout_height="0dp"
+			android:layout_weight="1"
+			android:gravity="center"
+			android:orientation="vertical"
+			android:padding="@dimen/margin_medium"
+			android:visibility="visible"
+			tools:visibility="visible">
+
+<!--			<ProgressBar-->
+<!--				style="?android:attr/progressBarStyleLarge"-->
+<!--				android:layout_width="wrap_content"-->
+<!--				android:layout_height="wrap_content" />-->
+
+			<TextView
+				android:id="@+id/connect_status"
+				android:layout_width="match_parent"
+				android:layout_height="wrap_content"
+				android:gravity="center"
+				android:paddingTop="@dimen/margin_large"
+				android:textSize="20sp"
+				android:text="@string/waiting_for_contact_to_scan" />
+		</LinearLayout>
+
+		<org.briarproject.briar.android.view.QrCodeView
+			android:id="@+id/qr_code_view"
+			android:layout_width="match_parent"
+			android:layout_height="0dp"
+			android:layout_weight="1"
+			android:background="@android:color/white"
+			tools:visibility="visible" />
+
+	</LinearLayout>
+
+</FrameLayout>

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

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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/linearLayout"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:paddingLeft="@dimen/margin_large"
+	android:paddingTop="@dimen/margin_medium"
+	android:paddingRight="@dimen/margin_large"
+	android:paddingBottom="@dimen/margin_medium">
+
+	<TextView
+		android:id="@+id/textView1"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:gravity="center"
+		android:text="@string/recovery_account_recovered"
+		android:textSize="30sp"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toTopOf="parent" />
+
+	<ImageView
+		android:id="@+id/imageView2"
+		android:layout_width="match_parent"
+		android:layout_height="0dp"
+		android:layout_marginStart="32dp"
+		android:layout_marginLeft="32dp"
+		android:layout_marginTop="8dp"
+		android:layout_marginEnd="32dp"
+		android:layout_marginRight="32dp"
+		app:layout_constraintDimensionRatio="1:1"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/textView1"
+		app:srcCompat="@drawable/ic_baseline_done_outline_24" />
+
+	<Button
+		android:id="@+id/button"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="32dp"
+		android:text="@string/continue_button"
+		android:textSize="24sp"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/textView2" />
+
+	<TextView
+		android:id="@+id/textView2"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:gravity="center"
+		android:text="@string/recovery_account_recovered_explain"
+		android:textSize="20sp"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/imageView2" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -676,19 +676,23 @@
 	<!-- recovery from the secret owner's POV -->
 
 	<string name="recovery_explainer">You need to meet your trusted contacts in-person to receive pieces</string>
+	<string name="recovery_explainer_extra">Your trusted contact must scan a QR code to initiate the transfer.\n\nYou must both be connected to the same wifi network</string>
 	<string name="recovery_begin">Begin</string>
 	<string name="recovery_failed_to_receive">Failed to receive backup piece</string>
-	<string name="recovery_helpful_suggestions">Please check that bluetooth is swtiched on and that no-one but your trusted contact is able to scan the QR code</string>
+	<string name="recovery_helpful_suggestions">Please check that you are both connected to the same wifi network and try again</string>
 	<string name="recovery_retry">Retry</string>
 	<string name="recovery_recovered_shards">Recovered backup pieces:</string>
 	<string name="recovery_scan_qr_code">Show QR code</string>
 	<string name="recovery_recovering_account">Recovering account…</string>
 	<string name="recovery_shard_received">Account backup piece received</string>
 	<string name="recovery_account_recovered">Account recovered</string>
+	<string name="recovery_account_recovered_explain">You must now set a new password for your account</string>
+	<string name="recovery_sending_ack">Sending acknowledgement</string>
 
 	<!-- recovery from the custodian's POV -->
 
 	<string name="custodian_recovery_explainer">You need to meet in-person to transfer backup piece</string>
+	<string name="custodian_recovery_explainer_extra">Make sure you are both connected to the same wifi network, and scan the QR code on your contact\'s device to begin transferring the backup piece</string>
 	<string name="custodian_recovery_failed_to_send">Failed to send backup piece</string>
 	<string name="custodian_scan_code">Scan code</string>
 	<string name="custodian_shard_sent">Account backup piece transmitted</string>
@@ -716,7 +720,7 @@
 
 	<!-- activity names -->
 	<string name="activity_name_distributed_backup">Social Backup</string>
-	<string name="activity_name_old_distributed_backup">Old Social Backup</string>
+	<string name="activity_name_restore_account">Restore Account</string>
 
 	<!-- conversation -->
 	<string name="social_backup_shard_received">You have received a social backup shard.</string>

briar-api/src/main/java/org/briarproject/briar/api/socialbackup/ContactData.java

@@ -1,10 +1,9 @@
-package org.briarproject.briar.socialbackup;
+package org.briarproject.briar.api.socialbackup;
 
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.properties.TransportProperties;
-import org.briarproject.briar.api.socialbackup.Shard;
 
 import java.util.Map;
 
@@ -13,14 +12,14 @@ import javax.annotation.concurrent.Immutable;
 
 @Immutable
 @NotNullByDefault
-class ContactData {
+public class ContactData {
 
 	private final Contact contact;
 	private final Map<TransportId, TransportProperties> properties;
 	@Nullable
 	private final Shard shard;
 
-	ContactData(Contact contact,
+	public ContactData(Contact contact,
 			Map<TransportId, TransportProperties> properties,
 			@Nullable Shard shard) {
 		this.contact = contact;

briar-api/src/main/java/org/briarproject/briar/api/socialbackup/SocialBackup.java

@@ -1,4 +1,4 @@
-package org.briarproject.briar.socialbackup;
+package org.briarproject.briar.api.socialbackup;
 
 import org.briarproject.bramble.api.identity.Identity;
 
@@ -9,7 +9,7 @@ public class SocialBackup {
 	private List<ContactData> contacts;
 	private int version;
 
-	SocialBackup (Identity identity, List<ContactData> contacts, int version) {
+	public SocialBackup (Identity identity, List<ContactData> contacts, int version) {
 		this.identity = identity;
 		this.contacts = contacts;
 		this.version = version;

briar-api/src/main/java/org/briarproject/briar/api/socialbackup/recovery/RestoreAccount.java

@@ -0,0 +1,24 @@
+package org.briarproject.briar.api.socialbackup.recovery;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.briar.api.socialbackup.ReturnShardPayload;
+import org.briarproject.briar.api.socialbackup.SocialBackup;
+
+import java.security.GeneralSecurityException;
+
+public interface RestoreAccount {
+
+
+	int getNumberOfShards();
+
+	boolean addReturnShardPayload(ReturnShardPayload toAdd);
+
+	boolean canRecover();
+
+	int recover() throws FormatException, GeneralSecurityException;
+
+	SocialBackup getSocialBackup();
+
+	void addContactsToDb() throws DbException;
+}

briar-core/src/main/java/org/briarproject/briar/socialbackup/BackupPayloadDecoder.java

@@ -4,6 +4,7 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.socialbackup.BackupPayload;
+import org.briarproject.briar.api.socialbackup.SocialBackup;
 
 import java.security.GeneralSecurityException;
 

briar-core/src/main/java/org/briarproject/briar/socialbackup/BackupPayloadDecoderImpl.java

@@ -20,6 +20,7 @@ import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.briar.api.socialbackup.BackupPayload;
 import org.briarproject.briar.api.socialbackup.MessageParser;
 import org.briarproject.briar.api.socialbackup.Shard;
+import org.briarproject.briar.api.socialbackup.SocialBackup;
 
 import java.security.GeneralSecurityException;
 import java.security.SecureRandom;
@@ -54,7 +55,7 @@ public class BackupPayloadDecoderImpl implements BackupPayloadDecoder {
 		this.messageParser = messageParser;
 	}
 
-	public SocialBackup decodeBackupPayload(
+	public org.briarproject.briar.api.socialbackup.SocialBackup decodeBackupPayload(
 			SecretKey secret,
 			BackupPayload backupPayload)
 			throws FormatException, GeneralSecurityException {
@@ -103,7 +104,7 @@ public class BackupPayloadDecoderImpl implements BackupPayloadDecoder {
 				handShakePrivateKey, created);
 		LOG.info("New identity created");
 
-		List<ContactData> contactDataList = new ArrayList();
+		List<org.briarproject.briar.api.socialbackup.ContactData> contactDataList = new ArrayList();
 
 		for (int i = 0; i < bdfContactData.size(); i++) {
 			BdfList bdfData = bdfContactData.getList(i);
@@ -139,8 +140,8 @@ public class BackupPayloadDecoderImpl implements BackupPayloadDecoder {
 			Contact contact =
 					new Contact(contactId, author, author.getId(), alias,
 							contactHandshakePublicKey, false);
-			ContactData contactData =
+			org.briarproject.briar.api.socialbackup.ContactData contactData =
-					new ContactData(contact, properties, shard);
+					new org.briarproject.briar.api.socialbackup.ContactData(contact, properties, shard);
 			contactDataList.add(contactData);
 			LOG.info("Contact added");
 		}

briar-core/src/main/java/org/briarproject/briar/socialbackup/BackupPayloadEncoder.java

@@ -3,12 +3,14 @@ package org.briarproject.briar.socialbackup;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.identity.Identity;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.briar.api.socialbackup.BackupPayload;
+import org.briarproject.briar.api.socialbackup.ContactData;
 
 import java.util.List;
 
 @NotNullByDefault
 interface BackupPayloadEncoder {
 
-	org.briarproject.briar.api.socialbackup.BackupPayload encodeBackupPayload(SecretKey secret, Identity identity,
+	BackupPayload encodeBackupPayload(SecretKey secret, Identity identity,
 			List<ContactData> contactData, int version);
 }

briar-core/src/main/java/org/briarproject/briar/socialbackup/BackupPayloadEncoderImpl.java

@@ -46,7 +46,7 @@ class BackupPayloadEncoderImpl implements BackupPayloadEncoder {
 
 	@Override
 	public org.briarproject.briar.api.socialbackup.BackupPayload encodeBackupPayload(SecretKey secret,
-			Identity identity, List<ContactData> contactData, int version) {
+			Identity identity, List<org.briarproject.briar.api.socialbackup.ContactData> contactData, int version) {
 		// Encode the local identity
 		BdfList bdfIdentity = new BdfList();
 		LocalAuthor localAuthor = identity.getLocalAuthor();
@@ -56,7 +56,7 @@ class BackupPayloadEncoderImpl implements BackupPayloadEncoder {
 		bdfIdentity.add(identity.getHandshakePrivateKey().getEncoded());
 		// Encode the contact data
 		BdfList bdfContactData = new BdfList();
-		for (ContactData cd : contactData) {
+		for (org.briarproject.briar.api.socialbackup.ContactData cd : contactData) {
 			BdfList bdfData = new BdfList();
 			Contact contact = cd.getContact();
 			bdfData.add(clientHelper.toList(contact.getAuthor()));

briar-core/src/main/java/org/briarproject/briar/socialbackup/SocialBackupManagerImpl.java

@@ -52,6 +52,7 @@ import org.briarproject.briar.api.socialbackup.ShardMessageHeader;
 import org.briarproject.briar.api.socialbackup.ShardReceivedEvent;
 import org.briarproject.briar.api.socialbackup.SocialBackupManager;
 import org.briarproject.briar.client.ConversationClientImpl;
+import org.briarproject.briar.api.socialbackup.ContactData;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -278,7 +279,7 @@ class SocialBackupManagerImpl extends ConversationClientImpl
 		}
 		// Create the encrypted backup payload
 		SecretKey secret = crypto.generateSecretKey();
-		List<ContactData> contactData = loadContactData(txn);
+		List<org.briarproject.briar.api.socialbackup.ContactData> contactData = loadContactData(txn);
 		BackupPayload payload =
 				createBackupPayload(txn, secret, contactData, 0);
 		// Create the shards
@@ -415,17 +416,17 @@ class SocialBackupManagerImpl extends ConversationClientImpl
 	}
 
 	private BackupPayload createBackupPayload(Transaction txn,
-			SecretKey secret, List<ContactData> contactData, int version)
+			SecretKey secret, List<org.briarproject.briar.api.socialbackup.ContactData> contactData, int version)
 			throws DbException {
 		Identity identity = identityManager.getIdentity(txn);
 		return backupPayloadEncoder.encodeBackupPayload(secret, identity,
 				contactData, version);
 	}
 
-	private List<ContactData> loadContactData(Transaction txn)
+	private List<org.briarproject.briar.api.socialbackup.ContactData> loadContactData(Transaction txn)
 			throws DbException {
 		Collection<Contact> contacts = contactManager.getContacts(txn);
-		List<ContactData> contactData = new ArrayList<>();
+		List<org.briarproject.briar.api.socialbackup.ContactData> contactData = new ArrayList<>();
 		for (Contact c : contacts) {
 			// Skip contacts that are in the process of being removed
 			Group contactGroup = getContactGroup(c);
@@ -433,7 +434,7 @@ class SocialBackupManagerImpl extends ConversationClientImpl
 			Map<TransportId, TransportProperties> props =
 					getTransportProperties(txn, c.getId());
 			Shard shard = getRemoteShard(txn, contactGroup.getId());
-			contactData.add(new ContactData(c, props, shard));
+			contactData.add(new org.briarproject.briar.api.socialbackup.ContactData(c, props, shard));
 		}
 		return contactData;
 	}
@@ -513,7 +514,7 @@ class SocialBackupManagerImpl extends ConversationClientImpl
 			throw new DbException(e);
 		}
 	}
-	private void updateBackup(Transaction txn, List<ContactData> contactData)
+	private void updateBackup(Transaction txn, List<org.briarproject.briar.api.socialbackup.ContactData> contactData)
 			throws DbException {
 		BackupMetadata backupMetadata = requireNonNull(getBackupMetadata(txn));
 		int newVersion = backupMetadata.getVersion() + 1;

briar-core/src/main/java/org/briarproject/briar/socialbackup/SocialBackupModule.java

@@ -11,8 +11,10 @@ import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.socialbackup.SocialBackupExchangeManager;
 import org.briarproject.briar.api.socialbackup.SocialBackupManager;
 import org.briarproject.briar.api.socialbackup.recovery.CustodianTask;
+import org.briarproject.briar.api.socialbackup.recovery.RestoreAccount;
 import org.briarproject.briar.api.socialbackup.recovery.SecretOwnerTask;
 import org.briarproject.briar.socialbackup.recovery.CustodianTaskImpl;
+import org.briarproject.briar.socialbackup.recovery.RestoreAccountImpl;
 import org.briarproject.briar.socialbackup.recovery.SecretOwnerTaskImpl;
 
 import javax.inject.Inject;
@@ -119,4 +121,10 @@ public class SocialBackupModule {
 	CustodianTask custodianTask(CustodianTaskImpl custodianTask) {
 		return custodianTask;
 	}
+
+	@Provides
+	@Singleton
+	RestoreAccount restoreAccount(RestoreAccountImpl restoreAccount) {
+		return restoreAccount;
+	}
 }

briar-core/src/main/java/org/briarproject/briar/socialbackup/recovery/RestoreAccountImpl.java

@@ -0,0 +1,136 @@
+package org.briarproject.briar.socialbackup.recovery;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.bramble.api.contact.ContactManager;
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.db.DatabaseComponent;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.identity.AuthorId;
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
+import org.briarproject.briar.api.socialbackup.BackupPayload;
+import org.briarproject.briar.api.socialbackup.ContactData;
+import org.briarproject.briar.api.socialbackup.DarkCrystal;
+import org.briarproject.briar.api.socialbackup.ReturnShardPayload;
+import org.briarproject.briar.api.socialbackup.Shard;
+import org.briarproject.briar.api.socialbackup.SocialBackup;
+import org.briarproject.briar.api.socialbackup.recovery.RestoreAccount;
+import org.briarproject.briar.socialbackup.BackupPayloadDecoder;
+
+import java.security.GeneralSecurityException;
+import java.util.ArrayList;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import static java.util.logging.Logger.getLogger;
+
+public class RestoreAccountImpl implements RestoreAccount {
+	private final ArrayList<ReturnShardPayload> recoveredShards = new ArrayList<>();
+	private final DarkCrystal darkCrystal;
+	private final Executor ioExecutor;
+	private final DatabaseComponent db;
+	private final ContactManager contactManager;
+	private final LifecycleManager lifecycleManager;
+	private SecretKey secretKey;
+	private final BackupPayloadDecoder backupPayloadDecoder;
+	private SocialBackup socialBackup;
+
+	private static final Logger LOG =
+			getLogger(RestoreAccountImpl.class.getName());
+
+	@Inject
+	RestoreAccountImpl(DarkCrystal darkCrystal,
+			BackupPayloadDecoder backupPayloadDecoder, DatabaseComponent db,
+			@IoExecutor Executor ioExecutor,
+			ContactManager contactManager,
+			LifecycleManager lifecycleManager) {
+		this.darkCrystal = darkCrystal;
+		this.backupPayloadDecoder = backupPayloadDecoder;
+		this.db = db;
+		this.ioExecutor = ioExecutor;
+		this.lifecycleManager = lifecycleManager;
+		this.contactManager = contactManager;
+	}
+
+	public int getNumberOfShards() {
+		return recoveredShards.size();
+	}
+
+	// TODO figure out how to actually use a hash set for these objects
+	public boolean addReturnShardPayload(ReturnShardPayload toAdd) {
+		boolean found = false;
+		for (ReturnShardPayload returnShardPayload : recoveredShards) {
+			if (toAdd.equals(returnShardPayload)) {
+				found = true;
+				break;
+			}
+		}
+		if (!found) recoveredShards.add(toAdd);
+		return !found;
+	}
+
+	public boolean canRecover() {
+		ArrayList<Shard> shards = new ArrayList<>();
+		for (ReturnShardPayload returnShardPayload : recoveredShards) {
+			// TODO check shards all have same secret id
+			shards.add(returnShardPayload.getShard());
+		}
+		try {
+			secretKey = darkCrystal.combineShards(shards);
+		} catch (GeneralSecurityException e) {
+			// TODO handle error message
+			return false;
+		}
+		return true;
+	}
+
+	public int recover() throws FormatException, GeneralSecurityException {
+		if (secretKey == null) throw new GeneralSecurityException();
+		// Find backup with highest version number
+		int highestVersion = -1;
+		for (ReturnShardPayload returnShardPayload : recoveredShards) {
+			BackupPayload backupPayload = returnShardPayload.getBackupPayload();
+			SocialBackup s = backupPayloadDecoder
+					.decodeBackupPayload(secretKey, backupPayload);
+			if (s.getVersion() > highestVersion) {
+				socialBackup = s;
+				highestVersion = s.getVersion();
+			}
+		}
+		return highestVersion;
+	}
+
+	public SocialBackup getSocialBackup() {
+		return socialBackup;
+	}
+
+	public void addContactsToDb() throws DbException {
+		if (socialBackup == null) throw new DbException();
+		AuthorId localAuthorId = socialBackup.getIdentity().getId();
+
+		ioExecutor.execute(() -> {
+			try {
+				lifecycleManager.waitForDatabase();
+			} catch (InterruptedException e) {
+				LOG.warning("Interrupted when waiting for database");
+			}
+			try {
+				db.transaction(false, txn -> {
+					for (ContactData contactData : socialBackup.getContacts()) {
+						Contact c = contactData.getContact();
+						LOG.info("Adding contact " + c.getAuthor().getName() + " " + c.getAlias());
+						contactManager.addContact(txn, c.getAuthor(), localAuthorId,
+								c.getHandshakePublicKey(), c.isVerified());
+					}
+				});
+			} catch (DbException e) {
+				LOG.warning("Error adding contacts to database");
+				LOG.warning(e.getMessage());
+			}
+			LOG.info("Added all contacts");
+		});
+	}
+}

briar-core/src/test/java/org/briarproject/briar/socialbackup/recovery/ReturnShardIntegrationTest.java

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.briarproject.bramble.test.TestDatabaseConfigModule;
 import org.briarproject.briar.api.socialbackup.BackupPayload;
+import org.briarproject.briar.api.socialbackup.MessageEncoder;
 import org.briarproject.briar.api.socialbackup.ReturnShardPayload;
 import org.briarproject.briar.api.socialbackup.Shard;
 import org.briarproject.briar.api.socialbackup.recovery.CustodianTask;
@@ -15,9 +16,9 @@ import org.junit.Test;
 
 import java.io.File;
 import java.net.InetAddress;
-import java.util.Arrays;
+import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.Executor;
 
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static junit.framework.TestCase.fail;
 import static org.briarproject.bramble.test.TestUtils.deleteTestDirectory;
 import static org.briarproject.bramble.test.TestUtils.getTestDirectory;
@@ -32,6 +33,8 @@ public class ReturnShardIntegrationTest extends BrambleTestCase {
 
 	private ReturnShardIntegrationTestComponent owner, custodian;
 
+	private ReturnShardPayload remotePayload;
+
 	@Before
 	public void setUp() throws Exception {
 		assertTrue(testDir.mkdirs());
@@ -50,16 +53,20 @@ public class ReturnShardIntegrationTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testReturnShard() {
+	public void testReturnShard() throws Exception {
 		SecretOwnerTask secretOwnerTask = owner.getSecretOwnerTask();
 		CustodianTask custodianTask = custodian.getCustodianTask();
-		byte[] payload = "its nice to be important but its more important to be nice".getBytes();
+		MessageEncoder messageEncoder = owner.getMessageEncoder();
 
-		Shard shard = new Shard("secretid".getBytes(), "shard".getBytes());
+		CountDownLatch secretOwnerFinished = new CountDownLatch(1);
+		CountDownLatch custodianFinished = new CountDownLatch(1);
+
+		Shard shard = new Shard("secret id".getBytes(), "shard".getBytes());
 		BackupPayload backupPayload = new BackupPayload("backup payload".getBytes());
         ReturnShardPayload returnShardPayload = new ReturnShardPayload(shard, backupPayload);
 
-//        payloadBytes = clientHelper
+        byte[] payloadBytes = messageEncoder.encodeReturnShardPayload(returnShardPayload);
+
 
 		SecretOwnerTask.Observer ownerObserver =
 				state -> {
@@ -67,30 +74,21 @@ public class ReturnShardIntegrationTest extends BrambleTestCase {
 						SecretOwnerTask.State.Listening listening =
 								(SecretOwnerTask.State.Listening) state;
 						byte[] qrPayload = listening.getLocalPayload();
-						System.out.println(qrPayload.length);
 						transferQrCode(custodianTask, qrPayload);
 					} else if (state instanceof SecretOwnerTask.State.Success) {
-						ReturnShardPayload remotePayload = ((SecretOwnerTask.State.Success) state).getRemotePayload();
+						remotePayload = ((SecretOwnerTask.State.Success) state).getRemotePayload();
-						assertTrue(remotePayload.equals(payload));
+						secretOwnerFinished.countDown();
-						System.out.println("Success");
 					} else if (state instanceof SecretOwnerTask.State.Failure) {
-						System.out.println("Owner state: failure");
 						fail();
-					} else {
-						System.out.println(
-								"owner: " + state.getClass().getSimpleName());
 					}
 				};
 
 		CustodianTask.Observer custodianObserver =
 				state -> {
 					if (state instanceof CustodianTask.State.Success) {
-						assertEquals(1, 1);
+						custodianFinished.countDown();
 					} else if (state instanceof CustodianTask.State.Failure) {
 						fail();
-					} else {
-						System.out.println(
-								"custodian: " + state.getClass().getSimpleName());
 					}
 				};
 
@@ -105,19 +103,14 @@ public class ReturnShardIntegrationTest extends BrambleTestCase {
 
 		custodian.getIoExecutor().execute(() -> {
 			try {
-				custodianTask.start(custodianObserver, payload);
+				custodianTask.start(custodianObserver, payloadBytes);
 			} catch (Exception e) {
 				fail();
 			}
 		});
-
+        assertTrue(secretOwnerFinished.await(15000, MILLISECONDS));
-		// TODO how to get the test to wait for the io to finish
+		assertTrue(custodianFinished.await(15000, MILLISECONDS));
-		try {
+		assertTrue(remotePayload.equals(returnShardPayload));
-//			Thread.sleep(1000);
-			tearDown();
-		} catch (Exception e) {
-			fail();
-		}
 
 	}
 

briar-core/src/test/java/org/briarproject/briar/socialbackup/recovery/ReturnShardIntegrationTestComponent.java

@@ -2,6 +2,7 @@ package org.briarproject.briar.socialbackup.recovery;
 
 import org.briarproject.bramble.BrambleCoreIntegrationTestEagerSingletons;
 import org.briarproject.bramble.BrambleCoreModule;
+import org.briarproject.bramble.api.client.ClientHelper;
 import org.briarproject.bramble.api.connection.ConnectionManager;
 import org.briarproject.bramble.api.contact.ContactExchangeManager;
 import org.briarproject.bramble.api.contact.ContactManager;
@@ -10,6 +11,7 @@ import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.test.BrambleCoreIntegrationTestModule;
+import org.briarproject.briar.api.socialbackup.MessageEncoder;
 import org.briarproject.briar.api.socialbackup.recovery.CustodianTask;
 import org.briarproject.briar.api.socialbackup.recovery.SecretOwnerTask;
 import org.briarproject.briar.socialbackup.SocialBackupModule;
@@ -44,6 +46,8 @@ interface ReturnShardIntegrationTestComponent
 
 	LifecycleManager getLifecycleManager();
 
+	MessageEncoder getMessageEncoder();
+
 	SecretOwnerTask getSecretOwnerTask();
 
 	CustodianTask getCustodianTask();