const storage = require('../storage'); const mozlog = require('../log'); const log = mozlog('send.download'); const { statDownloadEvent } = require('../amplitude'); module.exports = async function(req, res) { const id = req.params.id; try { const meta = req.meta; const contentLength = await storage.length(id); const fileStream = await storage.get(id); let cancelled = false; req.on('aborted', () => { cancelled = true; fileStream.destroy(); }); res.writeHead(200, { 'Content-Type': 'application/octet-stream', 'Content-Length': contentLength }); fileStream.pipe(res).on('finish', async () => { if (cancelled) { return; } const dl = meta.dl + 1; const dlimit = meta.dlimit; const ttl = await storage.ttl(id); statDownloadEvent({ id, ip: req.ip, owner: meta.owner, download_count: dl, ttl, agent: req.ua.browser.name || req.ua.ua.substring(0, 6) }); try { if (dl >= dlimit) { await storage.del(id); } else { await storage.incrementField(id, 'dl'); } } catch (e) { log.info('StorageError:', id); } }); } catch (e) { res.sendStatus(404); } };