319 lines
9 KiB
Dart
319 lines
9 KiB
Dart
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:crypto/crypto.dart';
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import 'package:dart_blowfish/dart_blowfish.dart';
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import 'package:encrypt/encrypt.dart';
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import 'package:freezer/api/deezer.dart';
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import 'package:freezer/api/definitions.dart';
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import 'package:freezer/settings.dart';
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import 'package:logging/logging.dart';
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import 'package:http/http.dart' as http;
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class DeezerAudio {
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static const chunkSize = 2048;
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final DeezerAPI deezerAPI;
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AudioQuality quality;
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String trackId;
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DeezerAudio({
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required this.deezerAPI,
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required this.quality,
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required this.trackId,
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});
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static final _logger = Logger('DeezerAudio');
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Future<({Uri uri, String md5origin, String mediaVersion})> fallback(
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{required String md5origin, required String mediaVersion}) async {
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final res = await fallbackUrl(
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md5origin: md5origin,
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preferredQuality: quality,
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trackId: trackId,
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mediaVersion: mediaVersion);
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quality = res.quality;
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trackId = res.trackId;
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return (
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uri: res.uri,
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md5origin: res.md5origin,
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mediaVersion: res.mediaVersion
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);
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}
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Future<
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({
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String md5origin,
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String trackId,
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String mediaVersion,
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AudioQuality quality,
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Uri uri
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})> fallbackUrl({
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required String md5origin,
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required AudioQuality preferredQuality,
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required String trackId,
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required String mediaVersion,
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}) async {
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_logger.finer("called _fallbackUrl()");
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try {
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final rec = await qualityFallback(
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md5origin, preferredQuality, trackId, mediaVersion);
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return (
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md5origin: md5origin,
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trackId: trackId,
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mediaVersion: mediaVersion,
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quality: rec.$1,
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uri: rec.$2
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);
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} on QualityException {
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_logger.warning("quality fallback failed! trying trackId fallback");
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}
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Map? privateJson;
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try {
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// TRACK ID FALLBACK
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final data = await deezerAPI
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.callApi("deezer.pageTrack", params: {"sng_id": trackId});
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privateJson = data["results"]["DATA"];
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if (privateJson!.containsKey("FALLBACK")) {
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String fallbackId = privateJson["FALLBACK"]["SNG_ID"];
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if (fallbackId != trackId) {
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final newPrivate =
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await deezerAPI.callApi("song.getListData", params: {
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"sng_ids": [fallbackId]
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});
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final Map trackData = newPrivate["results"]["data"][0];
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trackId = trackData["SNG_ID"];
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md5origin = trackData["MD5_ORIGIN"];
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mediaVersion = trackData["MEDIA_VERSION"];
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return await fallbackUrl(
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md5origin: md5origin,
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preferredQuality: preferredQuality,
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trackId: trackId,
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mediaVersion: mediaVersion,
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);
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}
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}
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} catch (e, st) {
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_logger.warning("ID fallback failed! Trying ISRC fallback!", e, st);
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}
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try {
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final data =
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await deezerAPI.callPublicApi("track/isrc:${privateJson!["ISRC"]!}");
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final newId = data["id"] as int;
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if (newId == int.parse(trackId)) throw Exception();
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final newPrivate = await deezerAPI.callApi("song.getListData", params: {
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"sng_ids": [newId]
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});
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final trackData = newPrivate["results"]["data"][0] as Map;
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trackId = trackData["SNG_ID"];
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md5origin = trackData["MD5_ORIGIN"];
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mediaVersion = trackData["MEDIA_VERSION"];
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return await fallbackUrl(
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md5origin: md5origin,
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preferredQuality: preferredQuality,
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trackId: trackId,
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mediaVersion: mediaVersion,
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);
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} catch (e, st) {
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_logger.severe("ISRC Fallback failed, track unavailable!", e, st);
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}
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throw Exception(
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"Every known method of fallback failed, track unavailable!");
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}
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Future<(AudioQuality, Uri)> qualityFallback(String md5origin,
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AudioQuality currentQuality, String trackId, String mediaVersion) async {
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// only use url generation with MP3_128
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currentQuality = AudioQuality.MP3_128;
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final genUri =
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_generateTrackUri(md5origin, currentQuality, trackId, mediaVersion);
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final req = await http.head(genUri, headers: {
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'User-Agent': DeezerAPI.userAgent,
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'Accept-Language': '*',
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'Accept': '*/*'
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});
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int rc = req.statusCode;
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if (rc > 400) {
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_logger.warning(
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"quality fallback, response code: $rc, current quality: $currentQuality");
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switch (currentQuality) {
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case AudioQuality.FLAC:
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currentQuality = AudioQuality.MP3_320;
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break;
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case AudioQuality.MP3_320:
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currentQuality = AudioQuality.MP3_128;
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break;
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case AudioQuality.MP3_128:
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default:
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throw QualityException("No quality to fallback to!");
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}
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return await qualityFallback(
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md5origin, currentQuality, trackId, mediaVersion);
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}
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return (currentQuality, genUri);
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}
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Uri _generateTrackUri(String md5origin, AudioQuality quality, String trackId,
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String mediaVersion) {
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int magic = 164;
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// step 1
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final step1 = <int>[
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...md5origin.codeUnits,
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magic,
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...quality.toDeezerQualityInt().toString().codeUnits,
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magic,
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...trackId.codeUnits,
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magic,
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...mediaVersion.codeUnits,
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];
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// get md5 hash of step1
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final md5hex = md5.convert(step1).toString().toLowerCase();
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// step2
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final step2 = <int>[
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...md5hex.codeUnits,
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magic,
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...step1,
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magic,
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];
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// pad step2 with dots to get correct length
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while (step2.length % 16 > 0) {
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// step2.addAll(('.' * (step2.length % 16)).codeUnits);
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step2.add(46);
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}
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// encrypt with AES ECB
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final k = Uint8List.fromList('jo6aey6haid2Teih'.codeUnits);
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final encrypter = Encrypter(AES(Key(k), mode: AESMode.ecb, padding: null));
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final String step3 = encrypter
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.encryptBytes(step2, iv: IV(Uint8List(8)))
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.base16
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.toLowerCase();
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final uri =
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Uri.https('e-cdns-proxy-${md5origin[0]}.dzcdn.net', '/mobile/1/$step3');
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return uri;
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}
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static List<int> getKey(String id) {
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final secret = utf8.encode('g4el58wc0zvf9na1');
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final idmd5 =
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utf8.encode(md5.convert(utf8.encode(id)).toString().toLowerCase());
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final buffer = <int>[];
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for (int i = 0; i < 16; i++) {
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final s0 = idmd5[i];
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final s1 = idmd5[i + 16];
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final s2 = secret[i];
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buffer.add(s0 ^ s1 ^ s2);
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}
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return buffer;
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}
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static List<int> decryptChunk(List<int> key, List<int> data) {
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final Uint8List iv =
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Uint8List.fromList(const [00, 01, 02, 03, 04, 05, 06, 07]);
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final bf = Blowfish(
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key: Uint8List.fromList(key), mode: Mode.cbc, padding: Padding.none)
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..setIv(iv);
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Uint8List decrypted = bf.decode(data, returnType: Type.uInt8Array);
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return decrypted;
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}
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static Stream<List<int>> decryptionStream(Stream<List<int>> source,
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{required int start, required String trackId}) async* {
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var dropBytes = start % 2048;
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final deezerStart = start - dropBytes;
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int counter = deezerStart ~/ chunkSize;
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final buffer = List<int>.empty(growable: true);
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final key = getKey(trackId);
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await for (var bytes in source) {
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buffer.addAll(bytes);
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int i;
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for (i = 0; i < buffer.length; i += chunkSize) {
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if (buffer.length <= i + chunkSize) {
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break;
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}
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bytes = buffer.sublist(i, i + chunkSize);
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if ((counter % 3) == 0) {
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bytes = decryptChunk(key, bytes);
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}
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if (dropBytes > 0) {
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bytes = bytes.sublist(dropBytes);
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dropBytes = 0;
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}
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counter++;
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yield bytes;
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}
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if (i < buffer.length) {
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buffer.removeRange(0, i);
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} else {
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buffer.clear();
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}
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}
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// add remaining items in buffer
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if (buffer.isNotEmpty) {
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if (dropBytes > 0) {
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yield buffer.sublist(dropBytes);
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return;
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}
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yield buffer;
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}
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}
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static bool isTokenExpired(int trackTokenExpiration) =>
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DateTime.now().millisecondsSinceEpoch ~/ 1000 > trackTokenExpiration;
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Future<Uri?> getUrl(String trackToken, int expiration) =>
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getTrackUrl(deezerAPI, trackId, trackToken, expiration, quality: quality);
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static Future<Uri?> getTrackUrl(
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DeezerAPI deezerAPI,
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String trackId,
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String trackToken,
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int expiration, {
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required AudioQuality quality,
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}) async {
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final String actualTrackToken;
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if (isTokenExpired(expiration)) {
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// get new token via pipe API
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final newTrack = await deezerAPI.track(trackId);
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actualTrackToken = newTrack.trackToken!;
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} else {
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actualTrackToken = trackToken;
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}
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final res = await deezerAPI.getTrackUrl(
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actualTrackToken, quality.toDeezerQualityString());
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if (res.error != null) {
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_logger.warning('Error while getting track url: ${res.error!}');
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return null;
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}
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if (res.sources == null) {
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_logger.warning('Error while getting track url: No sources!');
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return null;
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}
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return Uri.parse(res.sources![0].url);
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}
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}
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