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index.js
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#!/usr/bin/env node
const crypto = require('crypto');
const fs = require('fs');
const https = require('https');
const httpProxy = require('http-proxy');
const config = JSON.parse(fs.readFileSync('./config.json'));
function isToken(oauth_token) {
return oauth_token.match(/^[-_0-9A-Za-z]+$/);
}
function readToken(oauth_token) {
try {
if (!isToken(oauth_token)) return false;
const file = `./tokens/${oauth_token}`;
const json = fs.readFileSync(file);
return JSON.parse(json);
} catch (e) {
return false;
}
}
function writeToken(token) {
const { oauth_token } = token;
const file = `./tokens/${oauth_token}`;
fs.writeFileSync(file, JSON.stringify(token));
}
function removeToken(token) {
const { oauth_token } = token;
const file = `./tokens/${oauth_token}`;
fs.unlinkSync(file);
}
function httpsGet(url, options) {
return new Promise((resolve) => https.get(url, options, (res) => {
let buf = '';
res.on('data', (chunk) => buf += chunk);
res.on('end', () => resolve(buf));
}));
}
function createHeaders(token) {
const { cookies: { ct0, auth_token }, user_agent } = token;
return {
authorization: config.authorization,
cookie: `ct0=${ct0}; auth_token=${auth_token}`,
'x-csrf-token': ct0,
'user-agent': user_agent,
};
}
async function verifyCredentials(requestToken) {
const { cookies: { ct0, auth_token }, user_agent } = requestToken;
const url = 'https://api.twitter.com/1.1/account/verify_credentials.json';
const headers = createHeaders(requestToken);
const json = await httpsGet(url, { headers });
return JSON.parse(json);
}
function createToken() {
return crypto.randomBytes(32).toString('base64url');
}
function createPin() {
return crypto.randomInt(10000000).toString().padStart(7, '0');
}
function parseAuthorization(string = '') {
const parsed = {};
for (const pair of string.replace(/^\S+\s/, '').split(/,\s*/)) {
const [key, value] = pair.split("=");
parsed[key] = value?.slice(1, -1);
}
return parsed;
}
function parseCookie(string = '') {
const parsed = {};
for (const pair of string.split(/;\s*/)) {
const [key, value] = pair.split("=");
parsed[key] = value;
}
return parsed;
}
function createRequestToken(oauth_consumer_key) {
const consumer = config.consumers[oauth_consumer_key];
if (!consumer) return;
const { oauth_callback } = consumer;
const oauth_token = createToken();
const oauth_token_secret = createToken();
return {
oauth_consumer_key,
oauth_callback,
oauth_callback_confirmed: true,
oauth_token,
oauth_token_secret,
};
}
function createOobHtml(pin) {
return `<!DOCTYPE html><html><body><div id="bd" role="main"><div id="oauth_pin"><p><span id="code-desc"></span><kbd aria-labelledby="code-desc"><code>${pin}</code></kbd></p></div></div></body></html>`;
}
function createCallbackUrl(requestToken) {
const { oauth_callback, oauth_token, oauth_verifier } = requestToken;
const location = new URL(oauth_callback);
location.searchParams.set('oauth_token', oauth_token);
location.searchParams.set('oauth_verifier', oauth_verifier);
return location;
}
function createLoginUrl(token) {
const redirect = new URL('https://api.twitter.com/oauth/authorize');
redirect.searchParams.set('oauth_token', token);
const location = new URL('https://twitter.com/login');
location.searchParams.set('redirect_after_login', redirect);
return location;
}
async function createAccessToken(requestToken) {
const { oauth_consumer_key, cookies, user_agent } = requestToken;
const { id, screen_name } = await verifyCredentials(requestToken);
const oauth_token = `${id}-${createToken()}`;
const oauth_token_secret = createToken();
return {
oauth_consumer_key,
oauth_token,
oauth_token_secret,
cookies,
user_agent,
user_id: id,
screen_name,
}
}
function respondUrlencoded(res, obj) {
const params = new URLSearchParams(obj);
res.writeHead(200, { 'content-type': 'application/x-www-form-urlencoded' });
res.end(params.toString());
}
function respondHtml(res, data) {
res.writeHead(200, { 'content-type': 'text/html' });
res.end(data);
}
function respondJson(res, obj) {
const json = JSON.stringify(obj);
res.writeHead(200, { 'content-type': 'application/json' });
res.end(json);
}
function respondLocation(res, location) {
res.writeHead(302, { location });
res.end();
}
function respondBadRequest(res) {
res.writeHead(400);
res.end();
}
function sliceObject(obj, keys) {
const entries = keys.map((key) => [key, obj[key]]);
return Object.fromEntries(entries);
}
function respondRequestToken(res, requestToken) {
respondUrlencoded(res, sliceObject(requestToken, [
'oauth_token',
'oauth_token_secret',
'oauth_callback_confirmed',
]));
}
function respondAccessToken(res, accessToken) {
respondUrlencoded(res, sliceObject(accessToken, [
'oauth_token',
'oauth_token_secret',
'user_id',
'screen_name',
]));
}
function setCookies(requestToken, headers) {
const cookies = parseCookie(headers.cookie);
if (cookies.auth_token && cookies.ct0) {
requestToken.cookies = cookies;
requestToken.user_agent = headers['user-agent'];
return true;
}
}
const handlers = {
'/oauth/request_token': async ({ authorization }, url, res) => {
const { oauth_consumer_key } = parseAuthorization(authorization);
const requestToken = createRequestToken(oauth_consumer_key);
if (!requestToken) throw new Error();
writeToken(requestToken);
respondRequestToken(res, requestToken);
},
'/oauth/authorize': async (headers, url, res) => {
const oauth_token = url.searchParams.get('oauth_token');
const requestToken = readToken(oauth_token);
if (!requestToken) throw new Error();
if (setCookies(requestToken, headers)) {
if (requestToken.oauth_callback === 'oob') {
const pin = createPin();
requestToken.oauth_verifier = pin;
respondHtml(res, createOobHtml(pin));
} else {
requestToken.oauth_verifier = createToken();
respondLocation(res, createCallbackUrl(requestToken));
}
writeToken(requestToken);
} else {
respondLocation(res, createLoginUrl(oauth_token));
}
},
'/oauth/access_token': async ({ authorization }, url, res) => {
const { oauth_token, oauth_verifier } = parseAuthorization(authorization);
const requestToken = readToken(oauth_token);
if (!requestToken) throw new Error();
if (oauth_verifier !== requestToken.oauth_verifier) throw new Error();
removeToken(requestToken);
const accessToken = await createAccessToken(requestToken);
writeToken(accessToken);
respondAccessToken(res, accessToken)
},
};
const proxy = httpProxy.createProxyServer({
target: 'https://api.twitter.com',
secure: true,
});
proxy.on('proxyReq', (proxyReq, req, res, options) => {
const { authorization } = req.headers;
const { oauth_consumer_key, oauth_token } = parseAuthorization(authorization);
const accessToken = readToken(oauth_token);
if (!accessToken) return;
if (oauth_consumer_key !== accessToken.oauth_consumer_key) return;
const headers = createHeaders(accessToken);
for (const key of Object.keys(headers)) {
proxyReq.setHeader(key, headers[key]);
}
});
const defaultProxy = httpProxy.createProxyServer({ secure: true });
const options = {
key: fs.readFileSync('private.key'),
cert: fs.readFileSync('api.twitter.com.crt'),
};
const server = https.createServer(options, async (req, res) => {
const { headers } = req;
const url = new URL(req.url, `https://${headers.host}`);
console.log(new Date(), JSON.stringify(headers), req.url);
switch (headers.host) {
case 'api.twitter.com': {
const handler = handlers[url.pathname];
if (handler) {
try {
await handler(headers, url, res);
} catch (e) {
respondBadRequest(res);
}
} else {
proxy.web(req, res);
}
break;
}
case 'twitterrific.com': {
if (url.pathname === '/app/configuration.json') {
respondJson(res, { version: 0 });
} else {
defaultProxy.web(req, res, { target: url.origin });
}
break;
}
default: {
respondBadRequest(res);
}
}
});
server.listen(443);