Can send images in conversations

lib/helpers/api_helper.dart

@@ -1,11 +1,10 @@
-import 'dart:convert';
 import 'dart:io';
 
 import 'package:comunic/helpers/account_credentials_helper.dart';
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/api_response.dart';
 import 'package:comunic/models/config.dart';
-import 'package:http/http.dart' as http;
+import 'package:dio/dio.dart';
 
 /// API Helper
 ///
@@ -16,7 +15,7 @@ class APIHelper {
   ///
   /// This method should never throw but the response code of the [APIResponse]
   /// should be verified before accessing response content
-  Future<APIResponse> exec(APIRequest request) async {
+  Future<APIResponse> exec(APIRequest request, {bool multipart = false}) async {
     try {
       //Add API tokens
       request.addString("serviceName", config().serviceName);
@@ -38,20 +37,39 @@ class APIHelper {
       else
         url = Uri.https(config().apiServerName, path);
 
-      final response = await http.post(
+      final data = FormData.from(request.args);
+
+      // Process files (if required)
+      if (multipart)
+        request.files.forEach(
+            (k, v) => data.add(k, UploadFileInfo(v, v.path.split("/").last)));
+
+      // Execute the request
+      final response = await Dio().post(
         url.toString(),
-        body: request.args,
-        encoding: utf8
+        data: data,
+        options: Options(
+          receiveDataWhenStatusError: true,
+          validateStatus: (s) => true,
+          responseType: ResponseType.plain,
+        ),
       );
 
       if (response.statusCode != HttpStatus.ok)
         return APIResponse(response.statusCode, null);
 
-      return APIResponse(response.statusCode, utf8.decode(response.bodyBytes));
+      return APIResponse(response.statusCode, response.data);
     } on Exception catch (e) {
       print(e.toString());
       print("Could not execute a request!");
       return APIResponse(-1, null);
     }
   }
+
+  /// Same as exec, but also allows to send files
+  ///
+  /// Warning ! Currently the response body to such requests is always null !
+  Future<APIResponse> execWithFiles(APIRequest request) async {
+    return await exec(request, multipart: true);
+  }
 }

lib/helpers/conversations_helper.dart

@@ -4,6 +4,7 @@ import 'package:comunic/lists/conversation_messages_list.dart';
 import 'package:comunic/lists/conversations_list.dart';
 import 'package:comunic/lists/users_list.dart';
 import 'package:comunic/models/api_request.dart';
+import 'package:comunic/models/api_response.dart';
 import 'package:comunic/models/conversation.dart';
 import 'package:comunic/models/conversation_message.dart';
 import 'package:comunic/models/new_conversation_message.dart';
@@ -162,14 +163,25 @@ class ConversationsHelper {
 
   /// Send a new message to the server
   Future<SendMessageResult> sendMessage(NewConversationMessage message) async {
-    final response = await APIRequest(
+    final request = APIRequest(
       uri: "conversations/sendMessage",
       needLogin: true,
       args: {
         "conversationID": message.conversationID.toString(),
-        "message": message.message
+        "message": message.hasMessage ? message.message : ""
       },
-    ).exec();
+    );
+
+    //Check for image
+    if(message.hasImage)
+      request.addFile("image", message.image);
+
+    //Send the message
+    APIResponse response;
+    if(!message.hasImage)
+      response = await request.exec();
+    else
+      response = await request.execWithFiles();
 
     if(response.code == 401)
       return SendMessageResult.MESSAGE_REJECTED;