Implement auto mark as read for conversations

backend/src/main/java/net/buzzert/kordophone/backend/server/APIInterface.kt

@@ -47,6 +47,9 @@ interface APIInterface {
 
     @POST("/sendMessage")
     suspend fun sendMessage(@Body request: SendMessageRequest): Response<SendMessageResponse>
+
+    @POST("/markConversation")
+    suspend fun markConversation(@Query("guid") conversationGUID: String): Response<Void>
 }
 
 class ResponseDecodeError(val response: ResponseBody): Exception(response.string())

backend/src/main/java/net/buzzert/kordophone/backend/server/ChatRepository.kt

@@ -169,6 +169,13 @@ class ChatRepository(
         _errorEncounteredChannel.emit(Error.ConnectionError(e))
     }
 
+    suspend fun markConversationAsRead(conversation: Conversation) = try {
+        apiInterface.markConversation(conversation.guid)
+    } catch (e: java.lang.Exception) {
+        // Don't report via the channel, but log it.
+        Log.e(REPO_LOG, "Error marking conversation as read: ${e.message}")
+    }
+
     fun close() {
         database.close()
     }