61 lines
1.9 KiB
TypeScript
61 lines
1.9 KiB
TypeScript
import {
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AudioMimeType,
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BytesHasPrefix,
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GetArrayBuffer,
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GetCoverFromFile,
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GetMetaFromFile,
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SniffAudioExt,
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} from '@/decrypt/utils';
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import { parseBlob as metaParseBlob } from 'music-metadata-browser';
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import { DecryptResult } from '@/decrypt/entity';
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import { decryptKgmByteAtOffsetV2, decryptVprByteAtOffset } from '@jixun/kugou-crypto/dist/utils/decryptionHelper';
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//prettier-ignore
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const VprHeader = [
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0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
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0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31
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]
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//prettier-ignore
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const KgmHeader = [
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0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
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0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14
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]
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export async function Decrypt(file: File, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
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const oriData = new Uint8Array(await GetArrayBuffer(file));
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if (raw_ext === 'vpr') {
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if (!BytesHasPrefix(oriData, VprHeader)) throw Error('Not a valid vpr file!');
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} else {
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if (!BytesHasPrefix(oriData, KgmHeader)) throw Error('Not a valid kgm(a) file!');
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}
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let bHeaderLen = new DataView(oriData.slice(0x10, 0x14).buffer);
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let headerLen = bHeaderLen.getUint32(0, true);
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let audioData = oriData.slice(headerLen);
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let dataLen = audioData.length;
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let key1 = Array.from(oriData.slice(0x1c, 0x2c));
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key1.push(0);
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const decryptByte = raw_ext === 'vpr' ? decryptVprByteAtOffset : decryptKgmByteAtOffsetV2;
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for (let i = 0; i < dataLen; i++) {
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audioData[i] = decryptByte(audioData[i], key1, i);
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}
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const ext = SniffAudioExt(audioData);
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const mime = AudioMimeType[ext];
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let musicBlob = new Blob([audioData], { type: mime });
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const musicMeta = await metaParseBlob(musicBlob);
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const { title, artist } = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artist);
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return {
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album: musicMeta.common.album,
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picture: GetCoverFromFile(musicMeta),
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file: URL.createObjectURL(musicBlob),
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blob: musicBlob,
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ext,
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mime,
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title,
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artist,
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};
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}
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