178 lines
6.8 KiB
TypeScript
178 lines
6.8 KiB
TypeScript
import {getToken} from 'utils/common/key';
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import {getFileUrl, getThumbnailUrl} from 'utils/common/apiUtil';
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import CryptoWorker from 'utils/crypto';
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import {fileIsHEIC, convertHEIC2JPEG} from 'utils/file';
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import HTTPService from './HTTPService';
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import {File} from './fileService';
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class DownloadManager {
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private fileDownloads = new Map<number, Promise<string>>();
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private thumbnailDownloads = new Map<number, Promise<string>>();
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public async getPreview(file: File) {
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try {
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const token = getToken();
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if (!token) {
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return null;
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}
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const cache = await caches.open('thumbs');
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const cacheResp: Response = await cache.match(file.id.toString());
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if (cacheResp) {
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return URL.createObjectURL(await cacheResp.blob());
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}
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if (!this.thumbnailDownloads.get(file.id)) {
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const download = (async () => {
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const resp = await HTTPService.get(
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getThumbnailUrl(file.id),
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null,
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{'X-Auth-Token': token},
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{responseType: 'arraybuffer'},
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);
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const worker = await new CryptoWorker();
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const decrypted: any = await worker.decryptThumbnail(
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new Uint8Array(resp.data),
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await worker.fromB64(file.thumbnail.decryptionHeader),
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file.key,
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);
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try {
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await cache.put(
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file.id.toString(),
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new Response(new Blob([decrypted])),
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);
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} catch (e) {
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// TODO: handle storage full exception.
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}
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return URL.createObjectURL(new Blob([decrypted]));
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})();
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this.thumbnailDownloads.set(file.id, download);
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}
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return await this.thumbnailDownloads.get(file.id);
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} catch (e) {
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console.error('get preview Failed', e);
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}
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}
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getFile = async (file: File) => {
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try {
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if (!this.fileDownloads.get(file.id)) {
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const download = (async () => {
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const fileStream = await this.downloadFile(file);
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return URL.createObjectURL(
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await new Response(fileStream).blob(),
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);
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})();
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this.fileDownloads.set(file.id, download);
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}
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return await this.fileDownloads.get(file.id);
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} catch (e) {
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console.error('Failed to get File', e);
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}
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};
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async downloadFile(file: File) {
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const worker = await new CryptoWorker();
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const token = getToken();
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if (!token) {
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return null;
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}
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if (file.metadata.fileType === 0) {
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const resp = await HTTPService.get(
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getFileUrl(file.id),
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null,
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{'X-Auth-Token': token},
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{responseType: 'arraybuffer'},
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);
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const decrypted: any = await worker.decryptFile(
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new Uint8Array(resp.data),
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await worker.fromB64(file.file.decryptionHeader),
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file.key,
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);
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let decryptedBlob = new Blob([decrypted]);
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if (fileIsHEIC(file.metadata.title)) {
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decryptedBlob = await convertHEIC2JPEG(decryptedBlob);
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}
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return new ReadableStream({
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async start(controller: ReadableStreamDefaultController) {
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controller.enqueue(
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new Uint8Array(await decryptedBlob.arrayBuffer()),
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);
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controller.close();
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},
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});
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}
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const resp = await fetch(getFileUrl(file.id), {
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headers: {
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'X-Auth-Token': token,
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},
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});
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const reader = resp.body.getReader();
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const stream = new ReadableStream({
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async start(controller) {
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const decryptionHeader = await worker.fromB64(
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file.file.decryptionHeader,
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);
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const fileKey = await worker.fromB64(file.key);
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const {
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pullState,
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decryptionChunkSize,
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} = await worker.initDecryption(decryptionHeader, fileKey);
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let data = new Uint8Array();
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// The following function handles each data chunk
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function push() {
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// "done" is a Boolean and value a "Uint8Array"
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reader.read().then(async ({done, value}) => {
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// Is there more data to read?
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if (!done) {
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const buffer = new Uint8Array(
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data.byteLength + value.byteLength,
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);
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buffer.set(new Uint8Array(data), 0);
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buffer.set(
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new Uint8Array(value),
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data.byteLength,
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);
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if (buffer.length > decryptionChunkSize) {
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const fileData = buffer.slice(
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0,
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decryptionChunkSize,
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);
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const {
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decryptedData,
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} = await worker.decryptChunk(
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fileData,
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pullState,
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);
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controller.enqueue(decryptedData);
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data = buffer.slice(decryptionChunkSize);
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} else {
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data = buffer;
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}
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push();
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} else {
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if (data) {
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const {
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decryptedData,
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} = await worker.decryptChunk(
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data,
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pullState,
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);
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controller.enqueue(decryptedData);
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data = null;
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}
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controller.close();
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}
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});
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}
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push();
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},
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});
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return stream;
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}
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}
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export default new DownloadManager();
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