freezer/lib/api/spotify.dart

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import 'package:flutter/material.dart';
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import 'package:freezer/api/deezer.dart';
import 'package:freezer/api/download.dart';
import 'package:freezer/api/definitions.dart';
import 'package:freezer/settings.dart';
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import 'package:html/parser.dart';
import 'package:html/dom.dart' as dom;
import 'package:http/http.dart' as http;
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import 'dart:convert';
import 'dart:async';
SpotifyAPI spotify = SpotifyAPI();
class SpotifyAPI {
SpotifyPlaylist importingSpotifyPlaylist;
StreamController importingStream = StreamController.broadcast();
bool doneImporting;
//Parse spotify URL to URI (spotify:track:1234)
String parseUrl(String url) {
Uri uri = Uri.parse(url);
if (uri.pathSegments.length > 3) return null; //Invalid URL
if (uri.pathSegments.length == 3) return 'spotify:${uri.pathSegments[1]}:${uri.pathSegments[2]}';
if (uri.pathSegments.length == 2) return 'spotify:${uri.pathSegments[0]}:${uri.pathSegments[1]}';
return null;
}
//Get spotify embed url from uri
String getEmbedUrl(String uri) => 'https://embed.spotify.com/?uri=$uri';
//Extract JSON data form spotify embed page
Future<Map> getEmbedData(String url) async {
//Fetch
http.Response response = await http.get(url);
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//Parse
dom.Document document = parse(response.body);
dom.Element element = document.getElementById('resource');
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return jsonDecode(element.innerHtml);
}
Future<SpotifyPlaylist> playlist(String uri) async {
//Load data
String url = getEmbedUrl(uri);
Map data = await getEmbedData(url);
//Parse
SpotifyPlaylist playlist = SpotifyPlaylist.fromJson(data);
return playlist;
}
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Future convertPlaylist(SpotifyPlaylist playlist, {bool downloadOnly = false, BuildContext context, AudioQuality quality}) async {
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doneImporting = false;
importingSpotifyPlaylist = playlist;
//Create Deezer playlist
String playlistId;
if (!downloadOnly)
playlistId = await deezerAPI.createPlaylist(playlist.name, description: playlist.description);
//Search for tracks
List<Track> downloadTracks = [];
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for (SpotifyTrack track in playlist.tracks) {
Map deezer;
try {
//Search
deezer = await deezerAPI.callPublicApi('track/isrc:' + track.isrc);
if (deezer.containsKey('error')) throw Exception();
String id = deezer['id'].toString();
//Add
if (!downloadOnly)
await deezerAPI.addToPlaylist(id, playlistId);
if (downloadOnly)
downloadTracks.add(Track(id: id));
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track.state = TrackImportState.OK;
} catch (e) {
//On error
track.state = TrackImportState.ERROR;
}
//Download
if (downloadOnly)
await downloadManager.addOfflinePlaylist(
Playlist(trackCount: downloadTracks.length, tracks: downloadTracks, title: playlist.name),
private: false,
quality: quality
);
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//Add playlist id to stream, stream is for updating ui only
importingStream.add(playlistId);
importingSpotifyPlaylist = playlist;
}
doneImporting = true;
//Return DEEZER playlist id
return playlistId;
}
}
class SpotifyTrack {
String title;
String artists;
String isrc;
TrackImportState state = TrackImportState.NONE;
SpotifyTrack({this.title, this.artists, this.isrc});
//JSON
factory SpotifyTrack.fromJson(Map json) => SpotifyTrack(
title: json['name'],
artists: json['artists'].map((j) => j['name']).toList().join(', '),
isrc: json['external_ids']['isrc']
);
}
class SpotifyPlaylist {
String name;
String description;
List<SpotifyTrack> tracks;
String image;
SpotifyPlaylist({this.name, this.description, this.tracks, this.image});
//JSON
factory SpotifyPlaylist.fromJson(Map json) => SpotifyPlaylist(
name: json['name'],
description: json['description'],
image: (json['images'].length > 0) ? json['images'][0]['url'] : null,
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tracks: json['tracks']['items'].map<SpotifyTrack>((j) => SpotifyTrack.fromJson(j['track'])).toList()
);
}
enum TrackImportState {
NONE,
ERROR,
OK
}