314 lines
8.5 KiB
JavaScript
314 lines
8.5 KiB
JavaScript
import dotenv from 'dotenv'
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import express from 'express'
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import http from 'http'
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import redis from 'redis'
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import pg from 'pg'
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import log from 'npmlog'
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import url from 'url'
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import WebSocket from 'ws'
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import uuid from 'uuid'
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const env = process.env.NODE_ENV || 'development'
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dotenv.config({
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path: env === 'production' ? '.env.production' : '.env'
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})
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const pgConfigs = {
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development: {
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database: 'mastodon_development',
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host: '/var/run/postgresql',
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max: 10
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},
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production: {
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user: process.env.DB_USER || 'mastodon',
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password: process.env.DB_PASS || '',
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database: process.env.DB_NAME || 'mastodon_production',
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host: process.env.DB_HOST || 'localhost',
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port: process.env.DB_PORT || 5432,
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max: 10
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}
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}
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const app = express()
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const pgPool = new pg.Pool(pgConfigs[env])
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const server = http.createServer(app)
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const wss = new WebSocket.Server({ server })
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const redisClient = redis.createClient({
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host: process.env.REDIS_HOST || '127.0.0.1',
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port: process.env.REDIS_PORT || 6379,
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password: process.env.REDIS_PASSWORD
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})
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const subs = {}
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redisClient.on('pmessage', (_, channel, message) => {
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const callbacks = subs[channel]
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log.silly(`New message on channel ${channel}`)
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if (!callbacks) {
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return
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}
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callbacks.forEach(callback => callback(message))
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})
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redisClient.psubscribe('timeline:*')
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const subscribe = (channel, callback) => {
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log.silly(`Adding listener for ${channel}`)
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subs[channel] = subs[channel] || []
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subs[channel].push(callback)
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}
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const unsubscribe = (channel, callback) => {
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log.silly(`Removing listener for ${channel}`)
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subs[channel] = subs[channel].filter(item => item !== callback)
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}
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const allowCrossDomain = (req, res, next) => {
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res.header('Access-Control-Allow-Origin', '*')
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res.header('Access-Control-Allow-Headers', 'Authorization, Accept, Cache-Control')
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res.header('Access-Control-Allow-Methods', 'GET, OPTIONS')
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next()
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}
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const setRequestId = (req, res, next) => {
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req.requestId = uuid.v4()
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res.header('X-Request-Id', req.requestId)
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next()
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}
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const accountFromToken = (token, req, next) => {
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pgPool.connect((err, client, done) => {
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if (err) {
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next(err)
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return
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}
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client.query('SELECT oauth_access_tokens.resource_owner_id, users.account_id FROM oauth_access_tokens INNER JOIN users ON oauth_access_tokens.resource_owner_id = users.id WHERE oauth_access_tokens.token = $1 LIMIT 1', [token], (err, result) => {
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done()
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if (err) {
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next(err)
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return
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}
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if (result.rows.length === 0) {
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err = new Error('Invalid access token')
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err.statusCode = 401
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next(err)
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return
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}
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req.accountId = result.rows[0].account_id
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next()
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})
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})
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}
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const authenticationMiddleware = (req, res, next) => {
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if (req.method === 'OPTIONS') {
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next()
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return
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}
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const authorization = req.get('Authorization')
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if (!authorization) {
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const err = new Error('Missing access token')
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err.statusCode = 401
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next(err)
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return
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}
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const token = authorization.replace(/^Bearer /, '')
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accountFromToken(token, req, next)
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}
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const errorMiddleware = (err, req, res, next) => {
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log.error(req.requestId, err)
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res.writeHead(err.statusCode || 500, { 'Content-Type': 'application/json' })
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res.end(JSON.stringify({ error: err.statusCode ? `${err}` : 'An unexpected error occurred' }))
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}
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const placeholders = (arr, shift = 0) => arr.map((_, i) => `$${i + 1 + shift}`).join(', ');
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const streamFrom = (id, req, output, attachCloseHandler, needsFiltering = false) => {
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log.verbose(req.requestId, `Starting stream from ${id} for ${req.accountId}`)
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const listener = message => {
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const { event, payload, queued_at } = JSON.parse(message)
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const transmit = () => {
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const now = new Date().getTime()
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const delta = now - queued_at;
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log.silly(req.requestId, `Transmitting for ${req.accountId}: ${event} ${payload} Delay: ${delta}ms`)
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output(event, payload)
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}
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// Only messages that may require filtering are statuses, since notifications
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// are already personalized and deletes do not matter
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if (needsFiltering && event === 'update') {
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pgPool.connect((err, client, done) => {
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if (err) {
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log.error(err)
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return
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}
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const unpackedPayload = JSON.parse(payload)
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const targetAccountIds = [unpackedPayload.account.id].concat(unpackedPayload.mentions.map(item => item.id)).concat(unpackedPayload.reblog ? [unpackedPayload.reblog.account.id] : [])
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client.query(`SELECT target_account_id FROM blocks WHERE account_id = $1 AND target_account_id IN (${placeholders(targetAccountIds, 1)}) UNION SELECT target_account_id FROM mutes WHERE account_id = $1 AND target_account_id IN (${placeholders(targetAccountIds, 1)})`, [req.accountId].concat(targetAccountIds), (err, result) => {
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done()
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if (err) {
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log.error(err)
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return
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}
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if (result.rows.length > 0) {
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return
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}
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transmit()
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})
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})
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} else {
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transmit()
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}
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}
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subscribe(id, listener)
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attachCloseHandler(id, listener)
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}
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// Setup stream output to HTTP
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const streamToHttp = (req, res) => {
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res.setHeader('Content-Type', 'text/event-stream')
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res.setHeader('Transfer-Encoding', 'chunked')
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const heartbeat = setInterval(() => res.write(':thump\n'), 15000)
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req.on('close', () => {
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log.verbose(req.requestId, `Ending stream for ${req.accountId}`)
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clearInterval(heartbeat)
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})
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return (event, payload) => {
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res.write(`event: ${event}\n`)
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res.write(`data: ${payload}\n\n`)
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}
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}
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// Setup stream end for HTTP
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const streamHttpEnd = req => (id, listener) => {
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req.on('close', () => {
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unsubscribe(id, listener)
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})
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}
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// Setup stream output to WebSockets
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const streamToWs = (req, ws) => {
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const heartbeat = setInterval(() => ws.ping(), 15000)
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ws.on('close', () => {
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log.verbose(req.requestId, `Ending stream for ${req.accountId}`)
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clearInterval(heartbeat)
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})
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return (event, payload) => {
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if (ws.readyState !== ws.OPEN) {
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log.error(req.requestId, 'Tried writing to closed socket')
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return
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}
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ws.send(JSON.stringify({ event, payload }))
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}
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}
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// Setup stream end for WebSockets
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const streamWsEnd = ws => (id, listener) => {
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ws.on('close', () => {
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unsubscribe(id, listener)
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})
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ws.on('error', e => {
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unsubscribe(id, listener)
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})
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}
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app.use(setRequestId)
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app.use(allowCrossDomain)
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app.use(authenticationMiddleware)
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app.use(errorMiddleware)
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app.get('/api/v1/streaming/user', (req, res) => {
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streamFrom(`timeline:${req.accountId}`, req, streamToHttp(req, res), streamHttpEnd(req))
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})
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app.get('/api/v1/streaming/public', (req, res) => {
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streamFrom('timeline:public', req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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app.get('/api/v1/streaming/public/local', (req, res) => {
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streamFrom('timeline:public:local', req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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app.get('/api/v1/streaming/hashtag', (req, res) => {
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streamFrom(`timeline:hashtag:${req.params.tag}`, req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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app.get('/api/v1/streaming/hashtag/local', (req, res) => {
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streamFrom(`timeline:hashtag:${req.params.tag}:local`, req, streamToHttp(req, res), streamHttpEnd(req), true)
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})
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wss.on('connection', ws => {
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const location = url.parse(ws.upgradeReq.url, true)
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const token = location.query.access_token
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const req = { requestId: uuid.v4() }
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accountFromToken(token, req, err => {
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if (err) {
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log.error(req.requestId, err)
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ws.close()
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return
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}
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switch(location.query.stream) {
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case 'user':
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streamFrom(`timeline:${req.accountId}`, req, streamToWs(req, ws), streamWsEnd(ws))
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break;
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case 'public':
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streamFrom('timeline:public', req, streamToWs(req, ws), streamWsEnd(ws), true)
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break;
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case 'public:local':
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streamFrom('timeline:public:local', req, streamToWs(req, ws), streamWsEnd(ws), true)
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break;
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case 'hashtag':
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streamFrom(`timeline:hashtag:${location.query.tag}`, req, streamToWs(req, ws), streamWsEnd(ws), true)
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break;
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case 'hashtag:local':
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streamFrom(`timeline:hashtag:${location.query.tag}:local`, req, streamToWs(req, ws), streamWsEnd(ws), true)
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break;
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default:
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ws.close()
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}
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})
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})
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server.listen(process.env.PORT || 4000, () => {
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log.level = process.env.LOG_LEVEL || 'verbose'
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log.info(`Starting streaming API server on port ${server.address().port}`)
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})
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