124 lines
3.4 KiB
JavaScript
124 lines
3.4 KiB
JavaScript
const crypto = require('crypto');
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const storage = require('../storage');
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const config = require('../config');
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const mozlog = require('../log');
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const Limiter = require('../limiter');
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const fxa = require('../fxa');
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const { encryptedSize } = require('../../app/utils');
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const { Transform } = require('stream');
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const log = mozlog('send.upload');
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module.exports = function(ws, req) {
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let fileStream;
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ws.on('close', e => {
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if (e !== 1000 && fileStream !== undefined) {
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fileStream.destroy();
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}
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});
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ws.once('message', async function(message) {
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try {
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const newId = crypto.randomBytes(8).toString('hex');
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const owner = crypto.randomBytes(10).toString('hex');
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const fileInfo = JSON.parse(message);
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const timeLimit = fileInfo.timeLimit || config.default_expire_seconds;
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const dlimit = fileInfo.dlimit || 1;
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const metadata = fileInfo.fileMetadata;
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const auth = fileInfo.authorization;
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const user = await fxa.verify(fileInfo.bearer);
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const maxFileSize = user
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? config.max_file_size
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: config.anon_max_file_size;
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const maxExpireSeconds = user
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? config.max_expire_seconds
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: config.anon_max_expire_seconds;
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const maxDownloads = user
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? config.max_downloads
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: config.anon_max_downloads;
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if (config.fxa_required && !user) {
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ws.send(
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JSON.stringify({
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error: 401
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})
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);
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return ws.close();
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}
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if (
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!metadata ||
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!auth ||
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timeLimit <= 0 ||
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timeLimit > maxExpireSeconds ||
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dlimit > maxDownloads
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) {
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ws.send(
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JSON.stringify({
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error: 400
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})
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);
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return ws.close();
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}
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const meta = {
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owner,
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metadata,
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dlimit,
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auth: auth.split(' ')[1],
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nonce: crypto.randomBytes(16).toString('base64')
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};
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const protocol = config.env === 'production' ? 'https' : req.protocol;
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const url = `${protocol}://${req.get('host')}/download/${newId}/`;
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ws.send(
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JSON.stringify({
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url,
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ownerToken: meta.owner,
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id: newId
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})
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);
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const limiter = new Limiter(encryptedSize(maxFileSize));
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const eof = new Transform({
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transform: function(chunk, encoding, callback) {
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if (chunk.length === 1 && chunk[0] === 0) {
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this.push(null);
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} else {
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this.push(chunk);
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}
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callback();
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}
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});
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const wsStream = ws.constructor.createWebSocketStream(ws);
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fileStream = wsStream.pipe(eof).pipe(limiter); // limiter needs to be the last in the chain
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await storage.set(newId, fileStream, meta, timeLimit);
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if (ws.readyState === 1) {
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// if the socket is closed by a cancelled upload the stream
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// ends without an error so we need to check the state
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// before sending a reply.
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// TODO: we should handle cancelled uploads differently
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// in order to avoid having to check socket state and clean
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// up storage, possibly with an exception that we can catch.
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ws.send(JSON.stringify({ ok: true }));
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}
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} catch (e) {
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log.error('upload', e);
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if (ws.readyState === 1) {
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ws.send(
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JSON.stringify({
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error: e === 'limit' ? 413 : 500
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})
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);
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}
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}
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ws.close();
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});
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};
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