80 lines
3.2 KiB
JavaScript
80 lines
3.2 KiB
JavaScript
import {AudioMimeType, DetectAudioExt, GetArrayBuffer, GetCoverURL, GetFileInfo} from "./util";
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import {QmcMaskCreate58, QmcMaskGetDefault, QmcMaskDetectMgg, QmcMaskDetectMflac} from "./qmcMask";
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const musicMetadata = require("music-metadata-browser");
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const HandlerMap = {
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"mgg": {handler: QmcMaskDetectMgg, ext: "ogg", detect: true},
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"mflac": {handler: QmcMaskDetectMflac, ext: "flac", detect: true},
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"qmc0": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
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"qmc3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
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"qmcogg": {handler: QmcMaskGetDefault, ext: "ogg", detect: false},
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"qmcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
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"bkcmp3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
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"bkcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
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"tkm": {handler: QmcMaskGetDefault, ext: "m4a", detect: false}
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};
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export async function Decrypt(file, raw_filename, raw_ext) {
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if (!(raw_ext in HandlerMap)) return {status: false, message: "File type is incorrect!"};
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const handler = HandlerMap[raw_ext];
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const fileData = new Uint8Array(await GetArrayBuffer(file));
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let audioData, seed, keyData;
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if (handler.detect) {
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audioData = fileData.slice(0, -0x170);
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seed = handler.handler(audioData);
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keyData = fileData.slice(-0x170);
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if (seed === undefined) seed = await queryKeyInfo(keyData, raw_filename, raw_ext);
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if (seed === undefined) return {status: false, message: raw_ext + "格式仅提供实验性支持！"};
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} else {
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audioData = fileData;
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seed = handler.handler(audioData);
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}
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const dec = seed.Decrypt(audioData);
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const ext = DetectAudioExt(dec, handler.ext);
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const mime = AudioMimeType[ext];
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const musicData = new Blob([dec], {type: mime});
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const tag = await musicMetadata.parseBlob(musicData);
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const info = GetFileInfo(tag.common.artist, tag.common.title, raw_filename);
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if (handler.detect) reportKeyUsage(keyData, seed.Matrix128,
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info.artist, info.title, tag.common.album, raw_filename, raw_ext);
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return {
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status: true,
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title: info.title,
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artist: info.artist,
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ext: ext,
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album: tag.common.album,
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picture: GetCoverURL(tag),
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file: URL.createObjectURL(musicData),
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mime: mime
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}
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}
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function reportKeyUsage(keyData, maskData, artist, title, album, filename, format) {
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fetch("https://stats.ixarea.com/collect/qmcmask/usage", {
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method: "POST",
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headers: {"Content-Type": "application/json"},
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body: JSON.stringify({
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Mask: Array.from(maskData), Key: Array.from(keyData),
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Artist: artist, Title: title, Album: album, Filename: filename, Format: format
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}),
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}).then().catch()
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}
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async function queryKeyInfo(keyData, filename, format) {
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try {
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const resp = await fetch("https://stats.ixarea.com/collect/qmcmask/query", {
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method: "POST",
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headers: {"Content-Type": "application/json"},
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body: JSON.stringify({Format: format, Key: Array.from(keyData), Filename: filename}),
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});
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let data = await resp.json();
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return QmcMaskCreate58(data.Matrix58, data.Super58A, data.Super58B);
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} catch (e) {
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}
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}
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