import {AudioMimeType, DetectAudioExt, GetArrayBuffer, GetFileInfo, GetMetaCoverURL, RequestJsonp} from "./util"; import {QmcMaskCreate58, QmcMaskDetectMflac, QmcMaskDetectMgg, QmcMaskGetDefault} from "./qmcMask"; import {fromByteArray as Base64Encode, toByteArray as Base64Decode} from 'base64-js' const musicMetadata = require("music-metadata-browser"); const HandlerMap = { "mgg": {handler: QmcMaskDetectMgg, ext: "ogg", detect: true}, "mflac": {handler: QmcMaskDetectMflac, ext: "flac", detect: true}, "qmc0": {handler: QmcMaskGetDefault, ext: "mp3", detect: false}, "qmc2": {handler: QmcMaskGetDefault, ext: "ogg", detect: false}, "qmc3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false}, "qmcogg": {handler: QmcMaskGetDefault, ext: "ogg", detect: false}, "qmcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false}, "bkcmp3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false}, "bkcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false}, "tkm": {handler: QmcMaskGetDefault, ext: "m4a", detect: false} }; export async function Decrypt(file, raw_filename, raw_ext) { if (!(raw_ext in HandlerMap)) return {status: false, message: "File type is incorrect!"}; const handler = HandlerMap[raw_ext]; const fileData = new Uint8Array(await GetArrayBuffer(file)); let audioData, seed, keyData; if (handler.detect) { const keyLen = new DataView(fileData.slice(fileData.length - 4).buffer).getUint32(0, true) const keyPos = fileData.length - 4 - keyLen; audioData = fileData.slice(0, keyPos); seed = handler.handler(audioData); keyData = fileData.slice(keyPos, keyPos + keyLen); if (seed === undefined) seed = await queryKeyInfo(keyData, raw_filename, raw_ext); if (seed === undefined) return {status: false, message: raw_ext + "格式仅提供实验性支持"}; } else { audioData = fileData; seed = handler.handler(audioData); } let musicDecoded = seed.Decrypt(audioData); const ext = DetectAudioExt(musicDecoded, handler.ext); const mime = AudioMimeType[ext]; let musicBlob = new Blob([musicDecoded], {type: mime}); const musicMeta = await musicMetadata.parseBlob(musicBlob); for (let metaIdx in musicMeta.native) { if (musicMeta.native[metaIdx].some(item => item.id === "TCON" && item.value === "(12)")) { musicMeta.common.artist = decode(musicMeta.common.artist, "gbk"); musicMeta.common.title = decode(musicMeta.common.title, "gbk"); musicMeta.common.album = decode(musicMeta.common.album, "gbk"); } } const info = GetFileInfo(musicMeta.common.artist, musicMeta.common.title, raw_filename); if (handler.detect) reportKeyUsage(keyData, seed.Matrix128, info.artist, info.title, musicMeta.common.album, raw_filename, raw_ext); let imgUrl = GetMetaCoverURL(musicMeta); if (imgUrl === "") { imgUrl = await queryAlbumCoverImage(info.artist, info.title, musicMeta.common.album); //todo: 解决跨域获取图像的问题 } return { status: true, title: info.title, artist: info.artist, ext: ext, album: musicMeta.common.album, picture: imgUrl, file: URL.createObjectURL(musicBlob), mime: mime } } function reportKeyUsage(keyData, maskData, artist, title, album, filename, format) { fetch("https://stats.ixarea.com/collect/qmcmask/usage", { method: "POST", headers: {"Content-Type": "application/json"}, body: JSON.stringify({ Mask: Base64Encode(new Uint8Array(maskData)), Key: Base64Encode(keyData), Artist: artist, Title: title, Album: album, Filename: filename, Format: format }), }).then().catch() } async function queryKeyInfo(keyData, filename, format) { try { const resp = await fetch("https://stats.ixarea.com/collect/qmcmask/query", { method: "POST", headers: {"Content-Type": "application/json"}, body: JSON.stringify({Format: format, Key: Base64Encode(keyData), Filename: filename, Type: 44}), }); let data = await resp.json(); return QmcMaskCreate58(Base64Decode(data.Matrix44)); } catch (e) { console.log(e); } } async function queryAlbumCoverImage(artist, title, album) { let song_query_url = "https://c.y.qq.com/soso/fcgi-bin/client_search_cp?n=10&new_json=1&w=" + encodeURIComponent(artist + " " + title + " " + album); let jsonpData; let queriedSong = undefined; try { jsonpData = await RequestJsonp(song_query_url, "callback"); queriedSong = jsonpData["data"]["song"]["list"][0]; } catch (e) { } let imgUrl = ""; if (!!queriedSong && !!queriedSong["album"]) { if (queriedSong["album"]["pmid"] !== undefined) { imgUrl = "https://y.gtimg.cn/music/photo_new/T002M000" + queriedSong["album"]["pmid"] + ".jpg" } else if (queriedSong["album"]["id"] !== undefined) { imgUrl = "https://imgcache.qq.com/music/photo/album/" + queriedSong["album"]["id"] % 100 + "/albumpic_" + queriedSong["album"]["id"] + "_0.jpg" } } return imgUrl; }