Add method for deleting a contact from own mailbox

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxApi.java

@@ -1,5 +1,7 @@
 package org.briarproject.bramble.mailbox;
 
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.mailbox.MailboxProperties;
 
@@ -35,10 +37,17 @@ interface MailboxApi {
 	 * (contact was already added).
 	 */
 	void addContact(MailboxProperties properties, MailboxContact contact)
-			throws IOException, ApiException,
-			TolerableFailureException;
+			throws IOException, ApiException, TolerableFailureException;
+
+	/**
+	 * Deletes a contact from the mailbox.
+	 * This should get called after a contact was removed from Briar.
+	 */
+	void deleteContact(MailboxProperties properties, ContactId contactId)
+			throws IOException, ApiException;
 
 	@Immutable
+	@JsonSerialize
 	class MailboxContact {
 		public final int contactId;
 		public final String token, inboxId, outboxId;

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxApiImpl.java

@@ -5,6 +5,7 @@ import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.json.JsonMapper;
 
 import org.briarproject.bramble.api.WeakSingletonProvider;
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.mailbox.MailboxProperties;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
@@ -111,6 +112,21 @@ class MailboxApiImpl implements MailboxApi {
 		if (!response.isSuccessful()) throw new ApiException();
 	}
 
+	@Override
+	public void deleteContact(MailboxProperties properties, ContactId contactId)
+			throws IOException, ApiException {
+		if (!properties.isOwner()) throw new IllegalArgumentException();
+		String url = properties.getOnionAddress() + "/contacts/" +
+				contactId.getInt();
+		Request request = getRequestBuilder(properties.getAuthToken())
+				.delete()
+				.url(url)
+				.build();
+		OkHttpClient client = httpClientProvider.get();
+		Response response = client.newCall(request).execute();
+		if (response.code() != 200) throw new ApiException();
+	}
+
 	private Request.Builder getRequestBuilder(String token) {
 		return new Request.Builder()
 				.addHeader("Authorization", "Bearer " + token);

bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxApiTest.java

@@ -220,6 +220,49 @@ public class MailboxApiTest extends BrambleTestCase {
 				api.addContact(properties, mailboxContact));
 	}
 
+	@Test
+	public void testDeleteContact() throws Exception {
+		MockWebServer server = new MockWebServer();
+		server.enqueue(new MockResponse());
+		server.enqueue(new MockResponse().setResponseCode(205));
+		server.enqueue(new MockResponse().setResponseCode(401));
+		server.start();
+		String baseUrl = getBaseUrl(server);
+		MailboxProperties properties =
+				new MailboxProperties(baseUrl, token, true);
+
+		// contact gets deleted as expected
+		api.deleteContact(properties, contactId);
+		RecordedRequest request1 = server.takeRequest();
+		assertEquals("DELETE", request1.getMethod());
+		assertEquals("/contacts/" + contactId.getInt(), request1.getPath());
+		assertToken(request1, token);
+
+		// request is not returning 200
+		assertThrows(ApiException.class, () ->
+				api.deleteContact(properties, contactId));
+		RecordedRequest request2 = server.takeRequest();
+		assertEquals("DELETE", request2.getMethod());
+		assertEquals("/contacts/" + contactId.getInt(), request2.getPath());
+		assertToken(request2, token);
+
+		// request is not authorized
+		assertThrows(ApiException.class, () ->
+				api.deleteContact(properties, contactId));
+		RecordedRequest request3 = server.takeRequest();
+		assertEquals("DELETE", request3.getMethod());
+		assertEquals("/contacts/" + contactId.getInt(), request3.getPath());
+		assertToken(request3, token);
+	}
+
+	@Test
+	public void testDeleteContactOnlyForOwner() {
+		MailboxProperties properties =
+				new MailboxProperties("", token, false);
+		assertThrows(IllegalArgumentException.class, () ->
+				api.deleteContact(properties, contactId));
+	}
+
 	private String getBaseUrl(MockWebServer server) {
 		String baseUrl = server.url("").toString();
 		return baseUrl.substring(0, baseUrl.length() - 1);