Refresh CSRF token and retry API call

.gitignore

@@ -35,6 +35,7 @@ android/local.properties
 .pub-cache/
 .pub/
 /build/
+.gradle
 
 # Web related
 lib/generated_plugin_registrant.dart

lib/api/deezer.dart

@@ -47,6 +47,7 @@ class DeezerAPI {
     });
     //Post
     http.Response res = await http.post(uri, headers: headers, body: jsonEncode(params));
+    dynamic body = jsonDecode(res.body);
     //Grab SID
     if (method == 'deezer.getUserData') {
       for (String cookieHeader in res.headers['set-cookie'].split(';')) {
@@ -55,8 +56,11 @@ class DeezerAPI {
         }
       }
     }
-
-    return jsonDecode(res.body);
+    // In case of error "Invalid CSRF token" retrieve new one and retry the same call
+    if (body['error'].isNotEmpty && body['error'].containsKey('VALID_TOKEN_REQUIRED') && await rawAuthorize()) {
+        return callApi(method, params: params, gatewayInput: gatewayInput);
+    }
+    return body;
   }
 
   Future<Map<dynamic, dynamic>> callPublicApi(String path) async {

lib/ui/details_screens.dart

@@ -752,14 +752,15 @@ class _PlaylistDetailsState extends State<PlaylistDetails> {
     if (playlist.tracks.length == 0) {
       //Get correct metadata
       deezerAPI.playlist(playlist.id)
-      .catchError((e) => setState(() => _error = true))
       .then((Playlist p) {
-        if (p == null) return;
         setState(() {
           playlist = p;
         });
         //Load tracks
         _load();
+      })
+      .catchError((e) {
+        setState(() => _error = true);
       });
     }
 
@@ -805,7 +806,7 @@ class _PlaylistDetailsState extends State<PlaylistDetails> {
                       ),
                       Container(height: 4.0),
                       Text(
-                        playlist.user.name,
+                        playlist.user.name??'',
                         overflow: TextOverflow.ellipsis,
                         maxLines: 2,
                         textAlign: TextAlign.center,