Add optional query params to api get function

lib/api/client.dart

@@ -25,10 +25,20 @@ class Client {
         'Content-Type': 'application/json'
       };
 
-  Future<dynamic> get(String url) {
-    return http
-        .get('${this.base}$url', headers: _headers)
-        .then(_handleResponse);
+  Future<dynamic> get(String url, [Map<String, String> queryParameters]) {
+    // TODO: This could be moved to a seperate function
+    var uri = Uri.parse('${this.base}$url');
+    // Because these are all final values, we can't just add the queryParameters and must instead build a new Uri Object every time this method is called.
+    var newUri = Uri(
+        scheme: uri.scheme,
+        userInfo: uri.userInfo,
+        host: uri.host,
+        port: uri.port,
+        path: uri.path,
+        query: uri.query,
+        queryParameters: queryParameters,
+        fragment: uri.fragment);
+    return http.get(newUri, headers: _headers).then(_handleResponse);
   }
 
   Future<dynamic> delete(String url) {

lib/api/task_implementation.dart

@@ -28,9 +28,9 @@ class TaskAPIService extends APIService implements TaskService {
   }
 
   @override
-  Future<List<Task>> getAll(int listId) {
+  Future<List<Task>> getAll(int listId, [Map<String, String> queryParameters]) {
     return client
-        .get('/lists/$listId/tasks')
+        .get('/lists/$listId/tasks', queryParameters)
         .then((list) => convertList(list, (result) => Task.fromJson(result)));
   }
 }

lib/service/mocked_services.dart

@@ -137,7 +137,7 @@ class MockedTaskService implements TaskService {
   }
 
   @override
-  Future<List<Task>> getAll(int listId) {
+  Future<List<Task>> getAll(int listId, [Map<String, String> queryParameters]) {
     return Future.value(_tasks.values.toList());
   }
 }

lib/service/services.dart

@@ -26,7 +26,7 @@ abstract class TaskService {
   Future<Task> update(Task task);
   Future delete(int taskId);
   Future<Task> add(int listId, Task task);
-  Future<List<Task>> getAll(int listId);
+  Future<List<Task>> getAll(int listId, [Map<String, String> queryParameters]);
 }
 
 abstract class UserService {