fox-send/server/routes/ws.js

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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');
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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) {
fileStream.destroy();
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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;
const dlimit = fileInfo.dlimit || config.default_downloads;
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const metadata = fileInfo.fileMetadata;
const auth = fileInfo.authorization;
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const user = await fxa.verify(fileInfo.bearer);
const maxFileSize = config.max_file_size;
const maxExpireSeconds = config.max_expire_seconds;
const maxDownloads = config.max_downloads;
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if (config.fxa_required && !user) {
ws.send(
JSON.stringify({
error: 401
})
);
return ws.close();
}
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if (
!metadata ||
!auth ||
timeLimit <= 0 ||
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timeLimit > maxExpireSeconds ||
dlimit > maxDownloads
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) {
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ws.send(
JSON.stringify({
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error: 400
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})
);
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return ws.close();
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}
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const meta = {
owner,
metadata,
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dlimit,
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auth: auth.split(' ')[1],
nonce: crypto.randomBytes(16).toString('base64')
};
const url = `${config.deriveBaseUrl(req)}/download/${newId}/`;
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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
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await storage.set(newId, fileStream, meta, timeLimit);
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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.
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// 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.
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ws.send(JSON.stringify({ ok: true }));
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}
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} catch (e) {
log.error('upload', e);
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if (ws.readyState === 1) {
ws.send(
JSON.stringify({
error: e === 'limit' ? 413 : 500
})
);
}
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}
ws.close();
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});
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};