134 lines
3.0 KiB
TypeScript
134 lines
3.0 KiB
TypeScript
/**
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* File Server
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*/
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import * as fs from 'fs';
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import * as express from 'express';
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import * as bodyParser from 'body-parser';
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import * as cors from 'cors';
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import * as mongodb from 'mongodb';
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import * as gm from 'gm';
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import DriveFile, { getGridFSBucket } from '../api/models/drive-file';
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/**
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* Init app
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*/
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const app = express();
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app.disable('x-powered-by');
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app.locals.cache = true;
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app.use(bodyParser.urlencoded({ extended: true }));
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app.use(cors());
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/**
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* Statics
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*/
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app.use('/assets', express.static(`${__dirname}/assets`, {
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maxAge: 1000 * 60 * 60 * 24 * 365 // 一年
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}));
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app.get('/', (req, res) => {
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res.send('yee haw');
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});
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app.get('/default-avatar.jpg', (req, res) => {
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const file = fs.readFileSync(`${__dirname}/assets/avatar.jpg`);
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send(file, 'image/jpeg', req, res);
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});
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app.get('/app-default.jpg', (req, res) => {
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const file = fs.readFileSync(`${__dirname}/assets/dummy.png`);
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send(file, 'image/png', req, res);
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});
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async function raw(data: Buffer, type: string, download: boolean, res: express.Response): Promise<any> {
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res.header('Content-Type', type);
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if (download) {
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res.header('Content-Disposition', 'attachment');
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}
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res.send(data);
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}
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async function thumbnail(data: Buffer, type: string, resize: number, res: express.Response): Promise<any> {
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if (!/^image\/.*$/.test(type)) {
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data = fs.readFileSync(`${__dirname}/assets/dummy.png`);
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}
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let g = gm(data);
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if (resize) {
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g = g.resize(resize, resize);
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}
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g
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.compress('jpeg')
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.quality(80)
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.toBuffer('jpeg', (err, img) => {
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if (err !== undefined && err !== null) {
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console.error(err);
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res.sendStatus(500);
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return;
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}
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res.header('Content-Type', 'image/jpeg');
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res.send(img);
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});
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}
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function send(data: Buffer, type: string, req: express.Request, res: express.Response): void {
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if (req.query.thumbnail !== undefined) {
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thumbnail(data, type, req.query.size, res);
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} else {
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raw(data, type, req.query.download !== undefined, res);
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}
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}
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async function sendFileById(req: express.Request, res: express.Response): Promise<void> {
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// Validate id
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if (!mongodb.ObjectID.isValid(req.params.id)) {
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res.status(400).send('incorrect id');
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return;
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}
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const fileId = new mongodb.ObjectID(req.params.id);
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const file = await DriveFile.findOne({ _id: fileId });
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// validate name
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if (req.params.name !== undefined && req.params.name !== file.filename) {
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res.status(404).send('there is no file has given name');
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return;
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}
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if (file == null) {
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res.status(404).sendFile(`${__dirname}/assets/dummy.png`);
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return;
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}
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const bucket = await getGridFSBucket();
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const buffer = await ((id): Promise<Buffer> => new Promise((resolve, reject) => {
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const chunks = [];
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const readableStream = bucket.openDownloadStream(id);
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readableStream.on('data', chunk => {
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chunks.push(chunk);
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});
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readableStream.on('end', () => {
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resolve(Buffer.concat(chunks));
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});
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}))(fileId);
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send(buffer, file.metadata.type, req, res);
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}
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/**
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* Routing
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*/
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app.get('/:id', sendFileById);
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app.get('/:id/:name', sendFileById);
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module.exports = app;
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