Ajout gestion des erreurs pour l'API Spotify.

Début de la gestion des playlists Spotify.

Sources/dafl_project_flutter/lib/api/api.dart

@@ -3,6 +3,7 @@ import 'dart:math';
 import 'package:http/http.dart' as http;
 import 'package:crypto/crypto.dart';
 import 'dart:developer' as dev;
+import '../exceptions/api_exception.dart';
 import 'track.dart';
 
 class Api {
@@ -12,12 +13,14 @@ class Api {
 
   //for web api
   get redirectUri => 'https://daflmusic.000webhostapp.com/callback/';
-  final _scopes = 'user-read-playback-state user-read-currently-playing';
+  final _scopes =
+      'user-read-playback-state user-read-currently-playing user-read-recently-played';
   late String _state;
   dynamic _codeVerifier;
   dynamic _codeChallenge;
   late String _encodedLogs;
   final _tokenType = 'Bearer ';
+  late http.Response _response; //use _setResponse() as kind of a private setter
 
   //from web api
   String? _code;
@@ -74,11 +77,11 @@ class Api {
   //session management
 
   requestUserAuthorization(Uri url) async {
-    if (url.queryParameters['state'] == _state.toString()) {
-      _code = url.queryParameters['code'];
-      await _requestAccessToken();
+    if (url.queryParameters['state'] != _state.toString()) {
+      throw ApiException();
     }
-    // TODO : implement the else
+    _code = url.queryParameters['code'];
+    await _requestAccessToken();
   }
 
   _requestAccessToken() async {
@@ -89,18 +92,19 @@ class Api {
       'client_id': _clientId,
       'code_verifier': _codeVerifier
     });
-    var response = await _client.post(urlToken, headers: <String, String>{
+    _setResponse(await _client.post(urlToken, headers: <String, String>{
       'Authorization': 'Basic $_encodedLogs',
       'Content-Type': 'application/x-www-form-urlencoded'
-    });
-    var decodedResponse = jsonDecode(utf8.decode(response.bodyBytes)) as Map;
+    }));
+    var decodedResponse = jsonDecode(utf8.decode(_response.bodyBytes)) as Map;
     _accessToken = decodedResponse['access_token'];
     _expiresIn = decodedResponse['expires_in'];
     _tokenEnd = DateTime.now().add(Duration(seconds: _expiresIn!));
     _refreshToken = decodedResponse['refresh_token'];
   }
 
-  Future<String?> _getToken() async {
+  //handle 401 status code (bad or expired token)
+  Future<String?> _getAccessToken() async {
     await _tokenValidity();
     return _accessToken;
   }
@@ -111,16 +115,23 @@ class Api {
     }
   }
 
+  _setResponse(value) {
+    if (value.statusCode != 200) {
+      throw ApiException();
+    }
+    _response = value;
+  }
+
   _getRefreshedAccessToken() async {
     var urlToken = Uri.https('accounts.spotify.com', 'api/token', {
       'grant_type': 'refresh_token',
       'refresh_token': _refreshToken,
       'client_id': _clientId
     });
-    var response = await _client.post(urlToken, headers: <String, String>{
+    _setResponse(await _client.post(urlToken, headers: <String, String>{
       'Content-Type': 'application/x-www-form-urlencoded'
-    });
-    var decodedResponse = jsonDecode(utf8.decode(response.bodyBytes)) as Map;
+    }));
+    var decodedResponse = jsonDecode(utf8.decode(_response.bodyBytes)) as Map;
     _accessToken = decodedResponse['access_token'];
     _expiresIn = decodedResponse['expires_in'];
     _tokenEnd = DateTime.now().add(Duration(seconds: _expiresIn!));
@@ -128,29 +139,40 @@ class Api {
 
   //functional methods
 
-  Future<String> getCurrentlyPlayingTrack() async {
-    var url = Uri.https('api.spotify.com', 'v1/me/player/currently-playing');
-    var token = await _getToken();
-    var response = await _client.get(url, headers: <String, String>{
+  Future<String> getRecentlyPlayedTrack() async {
+    var url = Uri.https(
+        'api.spotify.com', 'v1/me/player/recently-played', {'limit': '1'});
+    var token = await _getAccessToken();
+    _setResponse(await _client.get(url, headers: <String, String>{
       'Authorization': '$_tokenType $token',
       'Content-Type': 'application/json'
-    });
-    var decodedResponse = jsonDecode(utf8.decode(response.bodyBytes)) as Map;
-    return decodedResponse['item']['id'];
+    }));
+    var decodedResponse = jsonDecode(utf8.decode(_response.bodyBytes)) as Map;
+    return decodedResponse['items'][0]['track']['id'];
   }
 
   Future<Track> getTrackInfo(String id) async {
     var url = Uri.https('api.spotify.com', 'v1/tracks/$id');
-    var token = await _getToken();
-    var response = await _client.get(url, headers: <String, String>{
+    var token = await _getAccessToken();
+    _setResponse(await _client.get(url, headers: <String, String>{
       'Authorization': '$_tokenType $token',
       'Content-Type': 'application/json'
-    });
-    var decodedResponse = jsonDecode(utf8.decode(response.bodyBytes)) as Map;
-    return Track(
-        decodedResponse['artists'][0]['name'],
-        decodedResponse['name'],
-        decodedResponse['album']['images']
-            [decodedResponse['album']['images'].length - 1]['url']);
+    }));
+    var decodedResponse = jsonDecode(utf8.decode(_response.bodyBytes)) as Map;
+    return Track(decodedResponse['artists'][0]['name'], decodedResponse['name'],
+        decodedResponse['album']['images'][0]['url']);
+  }
+
+  getPlaylists() async {
+    var url = Uri.https('api.spotify.com', 'v1/me/playlists', {'limit': '50'});
+    var token = await _getAccessToken();
+    _setResponse(await _client.get(url, headers: <String, String>{
+      'Authorization': '$_tokenType $token',
+      'Content-Type': 'application/json'
+    }));
+    var decodedResponse = jsonDecode(utf8.decode(_response.bodyBytes)) as Map;
+    dev.log(decodedResponse['items']
+        .where((element) => element['name'] == 'daflmusic')
+        .toString());
   }
 }

Sources/dafl_project_flutter/lib/api/in_app_browser.dart

@@ -1,6 +1,9 @@
 import 'dart:io';
-import 'package:dafl_project_flutter/main.dart';
 import 'package:flutter_inappwebview/flutter_inappwebview.dart';
+import 'dart:developer' as dev;
+import '../exceptions/api_exception.dart';
+import '../main.dart';
+import 'track.dart';
 
 class MyInAppBrowser extends InAppBrowser {
   var options = InAppBrowserClassOptions(
@@ -24,11 +27,19 @@ class MyInAppBrowser extends InAppBrowser {
   @override
   Future onLoadStart(url) async {
     if (url!.origin + url.path == MyApp.api.redirectUri) {
-      await MyApp.api.requestUserAuthorization(url);
-      /*String id = await MyApp.api.getCurrentlyPlayingTrack();
-      Track track = await MyApp.api.getTrackInfo(id);
-      print('${track.artist} ${track.name} ${track.albumImage}');*/
-      close();
+      try {
+        await MyApp.api.requestUserAuthorization(url);
+
+        /*String id = await MyApp.api.getRecentlyPlayedTrack();
+        Track track = await MyApp.api.getTrackInfo(id);
+        dev.log('${track.artist} ${track.name} ${track.albumImage}');*/
+
+        await MyApp.api.getPlaylists();
+      } on ApiException {
+        // TODO : add notification to show that an error occured
+      } finally {
+        close();
+      }
     }
   }
 }

Sources/dafl_project_flutter/lib/exceptions/api_exception.dart

@@ -0,0 +1,7 @@
+import 'dart:developer' as dev;
+
+class ApiException implements Exception {
+  ApiException() {
+    dev.log('Api exception raised');
+  }
+}