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 v3.0.18

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github-webhook.js

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#!/usr/bin/env node

import http from 'node:http'

import fs from 'node:fs'

import { spawn } from 'node:child_process'

import { fileURLToPath } from 'node:url'

import createHandler from 'github-webhook-handler'

import debug from 'debug'

import matchme from 'matchme'

import split2 from 'split2'

import through2 from 'through2'

import minimist from 'minimist'

const serverDebug = debug('github-webhook:server')

const eventsDebug = debug('github-webhook:events')

// Handle symlinks (npm global install creates symlinks)

function resolveRealPath (p) {

try {

return fs.realpathSync(p)

} catch {

return p

}

}

const isMain = resolveRealPath(process.argv[1]) === fileURLToPath(import.meta.url)

if (isMain) {

const argv = minimist(process.argv.slice(2))

let config = {}

if (typeof argv.config === 'string') {

config = JSON.parse(fs.readFileSync(argv.config))

}

if (argv.port !== undefined) {

config.port = argv.port

} else if (process.env.PORT !== undefined) {

config.port = process.env.PORT

}

if (argv.host !== undefined) {

config.host = String(argv.host)

}

if (argv.secret !== undefined) {

config.secret = String(argv.secret)

}

if (argv.path !== undefined) {

config.path = String(argv.path)

}

if (argv.log !== undefined) {

config.log = String(argv.log)

}

if (!Array.isArray(config.rules)) {

config.rules = []

}

if (argv.rule) {

config.rules = config.rules.concat(

collectRules(Array.isArray(argv.rule) ? argv.rule : [argv.rule])

)

}

const listening = function listening (err) {

if (err) {

throw err

}

serverDebug(`Listening on http://${this.address().address}:${this.address().port}`)

}

const server = createServer(config)

server.listen.apply(server, config.host

? [config.port, config.host, listening]

: [config.port, listening]

)

}

function collectRules (rules) {

return rules.map((rule) => {

let c = rule.indexOf(':')

if (c < 0) {

return null

}

const event = rule.substring(0, c)

rule = rule.substring(c + 1)

c = rule.indexOf(':')

if (c < 0) {

return null

}

const match = rule.substring(0, c)

const exec = rule.substring(c + 1)

if (!event || !match || !exec) {

return null

}

return { event, match, exec }

}).filter(Boolean)

}

function createServer (options) {

if (options.port === undefined) {

throw new TypeError('must provide a \'port\' option')

}

if (!Array.isArray(options.rules)) {

options.rules = []

}

const server = http.createServer()

const handler = createHandler(options)

const logStream = typeof options.log === 'string' && (

options.log === 'stdout'

? process.stdout

: options.log === 'stderr'

? process.stderr

: fs.createWriteStream(options.log)

)

server.webhookHandler = handler

server.on('request', (req, res) => {

serverDebug(`Connection from ${req.socket.address().address}:${req.socket.address().port}`)

handler(req, res, (err) => {

function response (code, msg) {

if (res.headersSent) {

return

}

const address = req.socket.address()

serverDebug('Response to %s:%s: %d "%s"',

address ? address.address : 'unknown',

address ? address.port : '??',

code,

msg

)

res.writeHead(code, { 'content-type': 'text/json' })

res.end(JSON.stringify({ error: msg }))

}

if (err) {

return response(500, `Internal server error: ${err.message}`)

}

response(404, 'Resource not found on this server')

})

})

handler.on('error', (err) => {

eventsDebug('Non-fatal error: ' + JSON.stringify(err.message))

})

handler.on('*', (event) => {

eventsDebug(JSON.stringify(event))

handleRules(logStream, options.rules, event)

})

return server

}

function prefixStream (stream, prefix) {

return stream.pipe(split2()).pipe(through2((data, enc, callback) => {

callback(null, `${prefix}${data}\n`)

}))

}

function envFromPayload (payload, prefix, env) {

if (!env) {

env = {}

}

// Add branch as an env var without mutating the payload

if (payload.ref && payload.ref.startsWith('refs/heads/')) {

env[prefix + 'branch'] = payload.ref.substring('refs/heads/'.length)

}

Object.keys(payload).forEach((k) => {

const val = payload[k]

switch (typeof val) {

case 'boolean':

case 'number':

case 'string':

env[prefix + k] = val

break

case 'object':

if (val) {

envFromPayload(val, prefix + k + '_', env)

}

break

}

})

return env

}

function handleRules (logStream, rules, event) {

function executeRule (rule) {

if (rule.executing === true) {

rule.queued = true // we're busy working on this rule, queue up another run

return

}

rule.executing = true

const startTs = Date.now()

const eventStr = `event="${rule.event}", match="${rule.match}", exec="${rule.exec}"`

const exec = Array.isArray(rule.exec) ? rule.exec : ['sh', '-c', rule.exec]

eventsDebug('Matched rule for %s', eventStr)

const cp = spawn(exec.shift(), exec, {

env: Object.assign(envFromPayload(event.payload, 'gh_'), process.env)

})

cp.on('error', (err) => {

return eventsDebug('Error executing command [%s]: %s', rule.exec, err.message)

})

cp.on('close', (code) => {

eventsDebug('Executed command [%s] exited with [%d]', rule.exec, code)

if (logStream) {

logStream.write(eventStr + '\n')

logStream.write(new Date() + '\n')

logStream.write('Took ' + (Date.now() - startTs) + ' ms\n')

}

rule.executing = false

if (rule.queued === true) {

rule.queued = false

executeRule(rule) // do it again!

}

})

if (logStream) {

prefixStream(cp.stdout, 'stdout: ').pipe(logStream, { end: false })

prefixStream(cp.stderr, 'stderr: ').pipe(logStream, { end: false })

}

}

rules.forEach((rule) => {

if (rule.event !== '*' && rule.event !== event.event) {

return

}

if (!matchme(event.payload, rule.match)) {

return

}

executeRule(rule)

})

}

export default createServer