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