39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
const crypto = require('crypto');
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const storage = require('../storage');
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module.exports = async function(req, res, next) {
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const id = req.params.id;
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if (id && req.header('Authorization')) {
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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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if (!meta) {
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return res.sendStatus(404);
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}
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const hmac = crypto.createHmac(
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'sha256',
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Buffer.from(meta.auth, 'base64')
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);
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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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req.nonce = crypto.randomBytes(16).toString('base64');
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storage.setField(id, 'nonce', req.nonce);
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res.set('WWW-Authenticate', `send-v1 ${req.nonce}`);
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req.authorized = true;
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req.meta = meta;
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} else {
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res.set('WWW-Authenticate', `send-v1 ${meta.nonce}`);
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req.authorized = false;
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}
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} catch (e) {
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req.authorized = false;
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}
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}
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if (req.authorized) {
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next();
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} else {
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res.sendStatus(401);
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}
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};
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