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