import {AudioMimeType, GetArrayBuffer, GetCoverURL, GetFileInfo} from "./util"; import {QmcMaskCreate58, QmcMaskGetDefault, QmcMaskDetectMgg, QmcMaskDetectMflac} from "./qmcMask"; 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}, "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} }; //todo: use header to detect media type 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) { audioData = fileData.slice(0, -0x170); seed = handler.handler(audioData); keyData = fileData.slice(-0x170); if (seed === undefined) seed = await queryKeyInfo(keyData, raw_filename, raw_ext); if (seed === undefined) return {status: false, message: "此格式仅提供实验性支持!"}; } else { audioData = fileData; seed = handler.handler(audioData); } const dec = seed.Decrypt(audioData); const mime = AudioMimeType[handler.ext]; const musicData = new Blob([dec], {type: mime}); const tag = await musicMetadata.parseBlob(musicData); const info = GetFileInfo(tag.common.artist, tag.common.title, raw_filename); if (handler.detect) reportKeyUsage(keyData, seed.Matrix128, info.artist, info.title, tag.common.album, raw_filename, raw_ext); return { status: true, title: info.title, artist: info.artist, ext: handler.ext, album: tag.common.album, picture: GetCoverURL(tag), file: URL.createObjectURL(musicData), 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: Array.from(maskData), Key: Array.from(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: Array.from(keyData), Filename: filename}), }); let data = await resp.json(); return QmcMaskCreate58(data.Matrix58, data.Super58A, data.Super58B); } catch (e) { } }