Reconstruct

src/decrypt/common.js

@@ -0,0 +1,44 @@
+const NcmDecrypt = require("./ncm");
+const QmcDecrypt = require("./qmc");
+const RawDecrypt = require("./raw");
+const MFlacDecrypt = require("./mflac");
+
+export {CommonDecrypt}
+
+async function CommonDecrypt(file) {
+    let raw_ext = file.name.substring(file.name.lastIndexOf(".") + 1, file.name.length).toLowerCase();
+    let raw_filename = file.name.substring(0, file.name.lastIndexOf("."));
+    let rt_data;
+    switch (raw_ext) {
+        case "ncm":// Netease Mp3/Flac
+            rt_data = await NcmDecrypt.Decrypt(file.raw);
+            break;
+        case "mp3":// Raw Mp3
+        case "flac"://Raw Flac
+        case "m4a":// todo: Raw M4A
+        case "tm0":// QQ Music IOS Mp3
+        case "tm3":// QQ Music IOS Mp3
+            rt_data = await RawDecrypt.Decrypt(file.raw, raw_filename, raw_ext);
+            break;
+        case "qmc3"://QQ Music Android Mp3
+        case "qmc0"://QQ Music Android Mp3
+        case "qmcflac"://QQ Music Android Flac
+        case "qmcogg"://QQ Music Android Ogg
+            rt_data = await QmcDecrypt.Decrypt(file.raw, raw_filename, raw_ext);
+            break;
+        case "mflac"://QQ Music Desktop Flac
+            rt_data = await MFlacDecrypt.Decrypt(file.raw, raw_filename, raw_ext);
+            break;
+        case "tm2":// todo: QQ Music IOS M4A
+        case "tm6":// todo: QQ Music IOS M4A
+            debugger;
+            break;
+        default:
+            rt_data = {status: false, message: "不支持此文件格式",}
+    }
+    if (rt_data.status) {
+        rt_data.rawExt = raw_ext;
+        rt_data.rawFilename = raw_filename;
+    }
+    return rt_data;
+}

src/decrypt/mflac.js

@@ -0,0 +1,99 @@
+const musicMetadata = require("music-metadata-browser");
+const util = require("./util");
+export {Decrypt}
+
+async function Decrypt(file, raw_filename, raw_ext) {
+    // 获取扩展名
+    if (raw_ext !== "mflac") return {
+        status: false,
+        message: "File type is incorrect!",
+    };
+    // 读取文件
+    const fileBuffer = await util.GetArrayBuffer(file);
+    const audioData = new Uint8Array(fileBuffer.slice(0, -0x170));
+    const audioDataLen = audioData.length;
+
+    // 转换数据
+    const seed = new Mask();
+    if (!seed.DetectMask(audioData)) return {
+        status: false,
+        message: "此音乐无法解锁，目前mflac格式不提供完整支持",
+    };
+    for (let cur = 0; cur < audioDataLen; ++cur) {
+        audioData[cur] ^= seed.NextMask();
+    }
+    // 导出
+    const musicData = new Blob([audioData], {type: "audio/flac"});
+    const musicUrl = URL.createObjectURL(musicData);
+
+    // 读取Meta
+    let tag = await musicMetadata.parseBlob(musicData);
+    const info = util.GetFileInfo(tag.common.artist, tag.common.title, raw_filename, "flac");
+    let picUrl = util.GetCoverURL(tag);
+    // 返回
+    return {
+        status: true,
+        filename: info.filename,
+        title: info.title,
+        artist: info.artist,
+        album: tag.common.album,
+        picture: picUrl,
+        file: musicUrl,
+        mime: "audio/flac"
+    }
+}
+
+class Mask {
+    FLAC_HEADER = [0x66, 0x4C, 0x61, 0x43, 0x00];
+
+    constructor() {
+        this.index = -1;
+        this.mask_index = -1;
+        this.mask = Array(128).fill(0x00);
+    }
+
+    DetectMask(data) {
+
+        let search_len = data.length - 256, mask;
+        for (let block_idx = 0; block_idx < search_len; block_idx += 128) {
+            let flag = true;
+            mask = data.slice(block_idx, block_idx + 128);
+            let next_mask = data.slice(block_idx + 128, block_idx + 256);
+            for (let idx = 0; idx < 128; idx++) {
+                if (mask[idx] !== next_mask[idx]) {
+                    flag = false;
+                    break;
+                }
+            }
+            if (!flag) continue;
+
+
+            for (let test_idx = 0; test_idx < this.FLAC_HEADER.length; test_idx++) {
+                let p = data[test_idx] ^ mask[test_idx];
+                if (p !== this.FLAC_HEADER[test_idx]) {
+                    flag = false;
+                    debugger;
+                    break;
+                }
+            }
+            if (!flag) continue;
+            this.mask = mask;
+            return true;
+        }
+        return false;
+    }
+
+    NextMask() {
+        this.index++;
+        this.mask_index++;
+        if (this.index === 0x8000 || (this.index > 0x8000 && (this.index + 1) % 0x8000 === 0)) {
+            this.index++;
+            this.mask_index++;
+        }
+        if (this.mask_index >= 128) {
+            this.mask_index -= 128;
+        }
+        return this.mask[this.mask_index]
+    }
+
+}

src/decrypt/ncm.js

@@ -0,0 +1,171 @@
+const CryptoJS = require("crypto-js");
+const ID3Writer = require("browser-id3-writer");
+const util = require("./util");
+const CORE_KEY = CryptoJS.enc.Hex.parse("687a4852416d736f356b496e62617857");
+const META_KEY = CryptoJS.enc.Hex.parse("2331346C6A6B5F215C5D2630553C2728");
+
+
+export {Decrypt};
+
+async function Decrypt(file) {
+
+    const fileBuffer = await util.GetArrayBuffer(file);
+    const dataView = new DataView(fileBuffer);
+
+    if (dataView.getUint32(0, true) !== 0x4e455443 ||
+        dataView.getUint32(4, true) !== 0x4d414446)
+        return {status: false, message: "此ncm文件已损坏"};
+
+
+    const keyDataObj = getKeyData(dataView, fileBuffer, 10);
+    const keyBox = getKeyBox(keyDataObj.data);
+
+    const musicMetaObj = getMetaData(dataView, fileBuffer, keyDataObj.offset);
+    const musicMeta = musicMetaObj.data;
+
+    let audioOffset = musicMetaObj.offset + dataView.getUint32(musicMetaObj.offset + 5, true) + 13;
+    let audioData = new Uint8Array(fileBuffer, audioOffset);
+
+    for (let cur = 0; cur < audioData.length; ++cur) {
+        audioData[cur] ^= keyBox[cur & 0xff];
+    }
+
+    if (musicMeta.format === undefined) {
+        const [f, L, a, C] = audioData;
+        if (f === 0x66 && L === 0x4c && a === 0x61 && C === 0x43) {
+            musicMeta.format = "flac";
+        } else {
+            musicMeta.format = "mp3";
+        }
+    }
+    const mime = util.AudioMimeType[musicMeta.format];
+
+    const artists = [];
+    musicMeta.artist.forEach(arr => {
+        artists.push(arr[0]);
+    });
+    if (musicMeta.format === "mp3") {
+        audioData = await writeID3(audioData, artists, musicMeta.musicName, musicMeta.album, musicMeta.albumPic)
+    }
+
+    const musicData = new Blob([audioData], {type: mime});
+    const musicUrl = URL.createObjectURL(musicData);
+    const filename = artists.join(" & ") + " - " + musicMeta.musicName + "." + musicMeta.format;
+    return {
+        status: true,
+        filename: filename,
+        title: musicMeta.musicName,
+        artist: artists.join(" & "),
+        album: musicMeta.album,
+        picture: musicMeta.albumPic,
+        file: musicUrl,
+        mime: mime
+    };
+}
+
+async function writeID3(audioData, artistList, title, album, picture) {
+    const writer = new ID3Writer(audioData);
+    writer.setFrame("TPE1", artistList)
+        .setFrame("TIT2", title)
+        .setFrame("TALB", album);
+    if (picture !== "") {
+        try {
+            const img = await (await fetch(picture)).arrayBuffer();
+            writer.setFrame('APIC', {
+                type: 3,
+                data: img,
+                description: 'Cover'
+            })
+        } catch (e) {
+            console.log("Fail to write cover image!");
+        }
+    }
+    writer.addTag();
+    return writer.arrayBuffer;
+}
+
+function getKeyData(dataView, fileBuffer, offset) {
+    const keyLen = dataView.getUint32(offset, true);
+    offset += 4;
+    const cipherText = new Uint8Array(fileBuffer, offset, keyLen).map(
+        uint8 => uint8 ^ 0x64
+    );
+    offset += keyLen;
+
+    const plainText = CryptoJS.AES.decrypt(
+        {ciphertext: CryptoJS.lib.WordArray.create(cipherText)},
+        CORE_KEY,
+        {
+            mode: CryptoJS.mode.ECB,
+            padding: CryptoJS.pad.Pkcs7
+        }
+    );
+
+    const result = new Uint8Array(plainText.sigBytes);
+
+    const words = plainText.words;
+    const sigBytes = plainText.sigBytes;
+    for (let i = 0; i < sigBytes; i++) {
+        result[i] = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
+    }
+
+    return {offset: offset, data: result.slice(17)};
+}
+
+function getKeyBox(keyData) {
+    const box = new Uint8Array(Array(256).keys());
+
+    const keyDataLen = keyData.length;
+
+    let j = 0;
+
+    for (let i = 0; i < 256; i++) {
+        j = (box[i] + j + keyData[i % keyDataLen]) & 0xff;
+        [box[i], box[j]] = [box[j], box[i]];
+    }
+
+    return box.map((_, i, arr) => {
+        i = (i + 1) & 0xff;
+        const si = arr[i];
+        const sj = arr[(i + si) & 0xff];
+        return arr[(si + sj) & 0xff];
+    });
+}
+
+/**
+ * @typedef {Object} MusicMetaType
+ * @property {Number} musicId
+ * @property {String} musicName
+ * @property {[[String, Number]]} artist
+ * @property {String} album
+ * @property {"flac"|"mp3"} format
+ * @property {String} albumPic
+ */
+
+function getMetaData(dataView, fileBuffer, offset) {
+    const metaDataLen = dataView.getUint32(offset, true);
+    offset += 4;
+    if (metaDataLen === 0) {
+        return {};
+    }
+
+    const cipherText = new Uint8Array(fileBuffer, offset, metaDataLen).map(
+        data => data ^ 0x63
+    );
+    offset += metaDataLen;
+
+    const plainText = CryptoJS.AES.decrypt({
+            ciphertext: CryptoJS.enc.Base64.parse(
+                CryptoJS.lib.WordArray.create(cipherText.slice(22)).toString(CryptoJS.enc.Utf8)
+            )
+        },
+        META_KEY,
+        {mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7}
+    );
+
+    const result = JSON.parse(plainText.toString(CryptoJS.enc.Utf8).slice(6));
+    result.albumPic = result.albumPic.replace("http:", "https:");
+    return {data: result, offset: offset};
+}
+
+

src/decrypt/qmc.js

@@ -0,0 +1,91 @@
+const musicMetadata = require("music-metadata-browser");
+const util = require("./util");
+export {Decrypt}
+const SEED_MAP = [
+    [0x4a, 0xd6, 0xca, 0x90, 0x67, 0xf7, 0x52],
+    [0x5e, 0x95, 0x23, 0x9f, 0x13, 0x11, 0x7e],
+    [0x47, 0x74, 0x3d, 0x90, 0xaa, 0x3f, 0x51],
+    [0xc6, 0x09, 0xd5, 0x9f, 0xfa, 0x66, 0xf9],
+    [0xf3, 0xd6, 0xa1, 0x90, 0xa0, 0xf7, 0xf0],
+    [0x1d, 0x95, 0xde, 0x9f, 0x84, 0x11, 0xf4],
+    [0x0e, 0x74, 0xbb, 0x90, 0xbc, 0x3f, 0x92],
+    [0x00, 0x09, 0x5b, 0x9f, 0x62, 0x66, 0xa1]];
+
+
+async function Decrypt(file, raw_filename, raw_ext) {
+    // 获取扩展名
+    let new_ext;
+    switch (raw_ext) {
+        case "qmc0":
+        case "qmc3":
+            new_ext = "mp3";
+            break;
+        case "qmcogg":
+            new_ext = "ogg";
+            break;
+        case "qmcflac":
+            new_ext = "flac";
+            break;
+        default:
+            return {status: false, message: "File type is incorrect!"}
+    }
+    const mime = util.AudioMimeType[new_ext];
+    // 读取文件
+    const fileBuffer = await util.GetArrayBuffer(file);
+    const audioData = new Uint8Array(fileBuffer);
+    // 转换数据
+    const seed = new Mask();
+    for (let cur = 0; cur < audioData.length; ++cur) {
+        audioData[cur] ^= seed.NextMask();
+    }
+    // 导出
+    const musicData = new Blob([audioData], {type: mime});
+    const musicUrl = URL.createObjectURL(musicData);
+    // 读取Meta
+    let tag = await musicMetadata.parseBlob(musicData);
+    const info = util.GetFileInfo(tag.common.artist, tag.common.title, raw_filename, raw_ext);
+    let picUrl = util.GetCoverURL(tag);
+
+    // 返回
+    return {
+        status: true,
+        filename: info.filename,
+        title: info.title,
+        artist: info.artist,
+        album: tag.common.album,
+        picture: picUrl,
+        file: musicUrl,
+        mime: mime
+    }
+}
+
+class Mask {
+    constructor() {
+        this.x = -1;
+        this.y = 8;
+        this.dx = 1;
+        this.index = -1;
+    }
+
+    NextMask() {
+        let ret;
+        this.index++;
+        if (this.x < 0) {
+            this.dx = 1;
+            this.y = (8 - this.y) % 8;
+            ret = 0xc3
+        } else if (this.x > 6) {
+            this.dx = -1;
+            this.y = 7 - this.y;
+            ret = 0xd8
+        } else {
+            ret = SEED_MAP[this.y][this.x]
+        }
+        this.x += this.dx;
+        if (this.index === 0x8000 || (this.index > 0x8000 && (this.index + 1) % 0x8000 === 0)) {
+            return this.NextMask()
+        }
+        return ret
+    }
+
+}

src/decrypt/raw.js

@@ -0,0 +1,25 @@
+const musicMetadata = require("music-metadata-browser");
+const util = require("./util");
+export {Decrypt}
+
+
+async function Decrypt(file, raw_filename, raw_ext) {
+    let tag = await musicMetadata.parseBlob(file);
+
+    let fileUrl = URL.createObjectURL(file);
+
+    const picUrl = util.GetCoverURL(tag);
+    const mime = util.AudioMimeType[raw_ext];
+    const info = util.GetFileInfo(tag.common.artist, tag.common.title, raw_filename, raw_ext);
+
+    return {
+        status: true,
+        filename: info.filename,
+        title: info.title,
+        artist: info.artist,
+        album: tag.common.album,
+        picture: picUrl,
+        file: fileUrl,
+        mime: mime
+    }
+}

src/decrypt/util.js

@@ -0,0 +1,51 @@
+export {GetArrayBuffer, GetFileInfo, GetCoverURL, AudioMimeType}
+
+// Also a new draft API: blob.arrayBuffer()
+async function GetArrayBuffer(blobObject) {
+    return await new Promise(resolve => {
+        const reader = new FileReader();
+        reader.onload = (e) => {
+            resolve(e.target.result);
+        };
+        reader.readAsArrayBuffer(blobObject);
+    });
+}
+
+const AudioMimeType = {
+    mp3: "audio/mpeg",
+    flac: "audio/flac",
+    m4a: "audio/mp4",
+    ogg: "audio/ogg"
+};
+
+function GetFileInfo(artist, title, filenameNoExt, ext) {
+    let newArtist = "", newTitle = "";
+    let filenameArray = filenameNoExt.split("-");
+    if (filenameArray.length > 1) {
+        newArtist = filenameArray[0].trim();
+        newTitle = filenameArray[1].trim();
+    } else if (filenameArray.length === 1) {
+        newTitle = filenameArray[0].trim();
+    }
+
+    if (typeof artist == "string" && artist !== "") {
+        newArtist = artist;
+    }
+    if (typeof title == "string" && title !== "") {
+        newTitle = title;
+    }
+    let newFilename = newArtist + " - " + newTitle + "." + ext;
+    return {artist: newArtist, title: newTitle, filename: newFilename};
+}
+
+/**
+ * @return {string}
+ */
+function GetCoverURL(metadata) {
+    let pic_url = "";
+    if (metadata.common.picture !== undefined && metadata.common.picture.length > 0) {
+        let pic = new Blob([metadata.common.picture[0].data], {type: metadata.common.picture[0].format});
+        pic_url = URL.createObjectURL(pic);
+    }
+    return pic_url;
+}