fox-send/server/routes/ws.js

117 lines
3.2 KiB
JavaScript

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