Implémentation refresh token et clean up du code

Sources/dafl_project_flutter/lib/api/api.dart

@@ -3,73 +3,110 @@ import 'dart:math';
 import 'package:http/http.dart' as http;
 
 class Api {
-  var clientId = '7ceb49d874b9404492246027e4d68cf8';
-  var clientSecret = '98f9cb960bf54ebbb9ad306e7ff919cb';
-  var redirectUri = 'https://daflmusic.000webhostapp.com/callback/';
-  var state;
-  String scopes = 'user-read-playback-state user-read-currently-playing';
-  var code;
-  var urlAuthorize;
-  String? access_token;
-  String token_type = 'Bearer ';
-  int? expires_in;
-  String? refresh_token;
+  //from dashboard
+  final _clientId = '7ceb49d874b9404492246027e4d68cf8';
+  final _clientSecret = '98f9cb960bf54ebbb9ad306e7ff919cb'; // TODO : hide it
 
-  var client = http.Client();
+  //for web api
+  get redirectUri => 'https://daflmusic.000webhostapp.com/callback/';
+  final _scopes = 'user-read-playback-state user-read-currently-playing';
+  String? _state;
+  String? _encodedLogs;
+  final _tokenType = 'Bearer ';
+
+  //from web api
+  String? _code;
+  int? _expiresIn;
+  String? _refreshToken;
+  String? _accessToken; //use _getToken() as kind of a private getter
+
+  //other
+  final _client = http.Client();
+  Uri? _urlAuthorize;
+  get urlAuthorize => _urlAuthorize;
+  DateTime? _tokenEnd;
 
   Api() {
-    state = generateRandomString();
-    urlAuthorize = Uri.https('accounts.spotify.com', 'authorize', {
-      'client_id': clientId,
+    _state = _generateRandomString();
+    _encodedLogs = base64.encode(utf8.encode("$_clientId:$_clientSecret"));
+    _urlAuthorize = Uri.https('accounts.spotify.com', 'authorize', {
+      'client_id': _clientId,
       'response_type': 'code',
       'redirect_uri': redirectUri,
-      'state': state,
-      'scope': scopes,
+      'state': _state,
+      'scope': _scopes,
       'show_dialog': 'true'
     });
   }
 
-  requestUserAuthorization(Uri url) {
-    if (url.queryParameters['state'] == state.toString()) {
-      code = url.queryParameters['code'];
-      requestAccessToken();
+  // for state value
+  String _generateRandomString() {
+    var r = Random();
+    return String.fromCharCodes(
+        List.generate(16, (index) => r.nextInt(33) + 89));
+  }
+
+  //session management
+
+  requestUserAuthorization(Uri url) async {
+    if (url.queryParameters['state'] == _state.toString()) {
+      _code = url.queryParameters['code'];
+      await _requestAccessToken();
     }
     // TODO : implement the else
   }
 
-  requestAccessToken() async {
+  _requestAccessToken() async {
     var urlToken = Uri.https('accounts.spotify.com', 'api/token', {
-      'code': code,
+      'code': _code,
       'redirect_uri': redirectUri,
       'grant_type': 'authorization_code'
     });
-    String credentials = "$clientId:$clientSecret";
-    String encodedLogs = base64.encode(utf8.encode(credentials));
-    var response = await client.post(urlToken, headers: <String, String>{
-      'Authorization': 'Basic $encodedLogs',
+    var response = await _client.post(urlToken, headers: <String, String>{
+      'Authorization': 'Basic $_encodedLogs',
+      'Content-Type': 'application/x-www-form-urlencoded'
+    });
+    var decodedResponse = jsonDecode(utf8.decode(response.bodyBytes)) as Map;
+    _accessToken = decodedResponse['access_token'];
+    _expiresIn = decodedResponse['expires_in'];
+    _tokenEnd = DateTime.now().add(Duration(seconds: _expiresIn!));
+    _refreshToken = decodedResponse['refresh_token'];
+  }
+
+  Future<String?> _getToken() async {
+    await _tokenValidity();
+    return _accessToken;
+  }
+
+  _tokenValidity() async {
+    if (DateTime.now().isAfter(_tokenEnd!)) {
+      await _getRefreshedAccessToken();
+    }
+  }
+
+  _getRefreshedAccessToken() async {
+    var urlToken = Uri.https('accounts.spotify.com', 'api/token',
+        {'grant_type': 'refresh_token', 'refresh_token': '$_refreshToken'});
+    var response = 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;
-    access_token = decodedResponse['access_token'];
-    expires_in = decodedResponse['expires_in'];
-    refresh_token = decodedResponse['refresh_token'];
-    getCurrentlyPlayingTrack();
+    _accessToken = decodedResponse['access_token'];
+    _expiresIn = decodedResponse['expires_in'];
+    _tokenEnd = DateTime.now().add(Duration(seconds: _expiresIn!));
   }
 
+  //functional methods
+
   getCurrentlyPlayingTrack() async {
     var url = Uri.https('api.spotify.com', 'v1/me/player/currently-playing');
-    var response = await client.get(url, headers: <String, String>{
-      'Authorization': '$token_type $access_token',
+    var token = await _getToken();
+    var response = await _client.get(url, headers: <String, String>{
+      'Authorization': '$_tokenType $token',
       'Content-Type': 'application/json'
     });
-    // Implement traitement of datas
-    print(response.body);
-  }
-
-  // for state value
-  String generateRandomString() {
-    var r = Random();
-    return String.fromCharCodes(
-        List.generate(16, (index) => r.nextInt(33) + 89));
+    // Implement treatment of data's
+    //print(response.body);
   }
 }

Sources/dafl_project_flutter/lib/api/in_app_browser.dart

@@ -24,7 +24,8 @@ class MyInAppBrowser extends InAppBrowser {
   @override
   Future onLoadStart(url) async {
     if (url!.origin + url.path == MyApp.api.redirectUri) {
-      MyApp.api.requestUserAuthorization(url);
+      await MyApp.api.requestUserAuthorization(url);
+      await MyApp.api.getCurrentlyPlayingTrack();
       close();
     }
   }

Sources/dafl_project_flutter/linux/flutter/generated_plugin_registrant.cc

@@ -0,0 +1,11 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#include "generated_plugin_registrant.h"
+
+
+void fl_register_plugins(FlPluginRegistry* registry) {
+}

Sources/dafl_project_flutter/linux/flutter/generated_plugin_registrant.h

@@ -0,0 +1,15 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter_linux/flutter_linux.h>
+
+// Registers Flutter plugins.
+void fl_register_plugins(FlPluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_

Sources/dafl_project_flutter/linux/flutter/generated_plugins.cmake

@@ -0,0 +1,23 @@
+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+)
+
+list(APPEND FLUTTER_FFI_PLUGIN_LIST
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/linux plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)
+
+foreach(ffi_plugin ${FLUTTER_FFI_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${ffi_plugin}/linux plugins/${ffi_plugin})
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${ffi_plugin}_bundled_libraries})
+endforeach(ffi_plugin)