40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
const storage = require('../storage');
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const crypto = require('crypto');
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function validateID(route_id) {
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return route_id.match(/^[0-9a-fA-F]{10}$/) !== null;
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}
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module.exports = async function(req, res) {
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const id = req.params.id;
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if (!validateID(id)) {
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return res.sendStatus(404);
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}
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try {
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const auth = req.header('Authorization').split(' ')[1];
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const meta = await storage.metadata(id);
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const hmac = crypto.createHmac('sha256', Buffer.from(meta.auth, 'base64'));
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hmac.update(Buffer.from(meta.nonce, 'base64'));
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const verifyHash = hmac.digest();
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if (!verifyHash.equals(Buffer.from(auth, 'base64'))) {
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res.set('WWW-Authenticate', `send-v1 ${meta.nonce}`);
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return res.sendStatus(401);
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}
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const nonce = crypto.randomBytes(16).toString('base64');
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storage.setField(id, 'nonce', nonce);
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res.set('WWW-Authenticate', `send-v1 ${nonce}`);
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const size = await storage.length(id);
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const ttl = await storage.ttl(id);
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res.send({
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metadata: meta.metadata,
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finalDownload: +meta.dl + 1 === +meta.dlimit,
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size,
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ttl
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});
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} catch (e) {
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res.sendStatus(404);
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}
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};
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