112 lines
3.7 KiB
JavaScript
112 lines
3.7 KiB
JavaScript
'use strict';
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const express = require('express'),
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crypto = require('crypto'),
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request = require('request'),
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router = express.Router();
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function signAndSend(message, name, domain, req, res, targetDomain) {
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// get the URI of the actor object and append 'inbox' to it
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let inbox = message.object.actor+'/inbox';
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let inboxFragment = inbox.replace('https://'+targetDomain,'');
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// get the private key
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let db = req.app.get('db');
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let result = db.prepare('select privkey from accounts where name = ?').get(`${name}@${domain}`);
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if (result === undefined) {
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return res.status(404).send(`No record found for ${name}.`);
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}
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else {
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let privkey = result.privkey;
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const digestHash = crypto.createHash('sha256').update(JSON.stringify(message)).digest('base64');
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const signer = crypto.createSign('sha256');
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let d = new Date();
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let stringToSign = `(request-target): post ${inboxFragment}\nhost: ${targetDomain}\ndate: ${d.toUTCString()}\ndigest: SHA-256=${digestHash}`;
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signer.update(stringToSign);
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signer.end();
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const signature = signer.sign(privkey);
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const signature_b64 = signature.toString('base64');
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let header = `keyId="https://${domain}/u/${name}",headers="(request-target) host date digest",signature="${signature_b64}"`;
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request({
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url: inbox,
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headers: {
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'Host': targetDomain,
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'Date': d.toUTCString(),
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'Digest': `SHA-256=${digestHash}`,
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'Signature': header
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},
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method: 'POST',
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json: true,
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body: message
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}, function (error, response){
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if (error) {
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console.log('Error:', error, response.body);
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}
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else {
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console.log('Response:', response.body);
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}
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});
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return res.status(200);
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}
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}
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function sendAcceptMessage(thebody, name, domain, req, res, targetDomain) {
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const guid = crypto.randomBytes(16).toString('hex');
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let message = {
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'@context': 'https://www.w3.org/ns/activitystreams',
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'id': `https://${domain}/${guid}`,
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'type': 'Accept',
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'actor': `https://${domain}/u/${name}`,
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'object': thebody,
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};
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signAndSend(message, name, domain, req, res, targetDomain);
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}
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function parseJSON(text) {
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try {
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return JSON.parse(text);
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} catch(e) {
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return null;
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}
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}
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router.post('/', function (req, res) {
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// pass in a name for an account, if the account doesn't exist, create it!
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let domain = req.app.get('domain');
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const myURL = new URL(req.body.actor);
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let targetDomain = myURL.hostname;
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// TODO: add "Undo" follow event
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if (typeof req.body.object === 'string' && req.body.type === 'Follow') {
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let name = req.body.object.replace(`https://${domain}/u/`,'');
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sendAcceptMessage(req.body, name, domain, req, res, targetDomain);
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// Add the user to the DB of accounts that follow the account
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let db = req.app.get('db');
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// get the followers JSON for the user
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let result = db.prepare('select followers from accounts where name = ?').get(`${name}@${domain}`);
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if (result === undefined) {
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console.log(`No record found for ${name}.`);
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}
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else {
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// update followers
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let followers = parseJSON(result.followers);
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if (followers) {
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followers.push(req.body.actor);
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// unique items
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followers = [...new Set(followers)];
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}
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else {
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followers = [req.body.actor];
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}
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let followersText = JSON.stringify(followers);
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try {
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// update into DB
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let newFollowers = db.prepare('update accounts set followers=? where name = ?').run(followersText, `${name}@${domain}`);
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console.log('updated followers!', newFollowers);
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}
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catch(e) {
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console.log('error', e);
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}
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}
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}
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});
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module.exports = router;
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