From 2834ad3bf57f6a984fb0beefb03e9db841a14a2f Mon Sep 17 00:00:00 2001 From: Hugh Rundle Date: Thu, 1 Aug 2024 18:19:05 +1000 Subject: [PATCH] Add files --- README.md | 14 +- curl_test.sh | 1 + docs.md | 58 ++++ git-webhooks.env | 9 + git-webhooks.service | 13 + nginx.conf | 8 + package-lock.json | 714 +++++++++++++++++++++++++++++++++++++++++++ package.json | 17 ++ webhooks.js | 99 ++++++ 9 files changed, 931 insertions(+), 2 deletions(-) create mode 100755 curl_test.sh create mode 100644 docs.md create mode 100644 git-webhooks.env create mode 100644 git-webhooks.service create mode 100644 nginx.conf create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 webhooks.js diff --git a/README.md b/README.md index 4ad9713..5827ebf 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,13 @@ -# git-webhooks +# 🪝 git-webhooks -Code for running a webhook service to receive webhooks sent by a git server. \ No newline at end of file +This Express app listens for webhook events from a git hosting service. It was originally written for GitHub but also works with Gitea and Forgejo, and anything else that uses the `X-Hub-Signature-256` header to send an HMAC SHA-256 digest of the payload. Alternatively you could change the code to look for a different header. + +How this works is outlined in a blog post - [Automation workflows with GitHub Actions and Webhooks](https://www.hughrundle.net/automation-workflows-with-github-actions-and-webhooks/), though I have slightly updated the code since then. + +## Installation + +See [the instructions](/docs.md) for installing on a server. + +## Testing + +There isn't a test suite, but you can use the `curl_test.sh` script to manually test that your app is working correctly. \ No newline at end of file diff --git a/curl_test.sh b/curl_test.sh new file mode 100755 index 0000000..f4d8417 --- /dev/null +++ b/curl_test.sh @@ -0,0 +1 @@ +curl -H "X-Hub-Signature-256:sha256=d32b2f468f839b3a8e855d9dfd9f4032b998490abec44ea5fcc76ea940bdef63" -d '{"ref":"refs/heads/main"}' -H "Content-Type: application/json" -X POST localhost:4040/library-map \ No newline at end of file diff --git a/docs.md b/docs.md new file mode 100644 index 0000000..f156aa5 --- /dev/null +++ b/docs.md @@ -0,0 +1,58 @@ +## Installing + +You will need `nodejs` and `systemd` installed, and access to an email account using SMTP. + +You might want to run the app with a dedicated non-privileged user: + +```sh +sudo adduser webhooks +su webhooks +cd ~ +``` + +Now you can install `git-webhooks` as the `webhooks` user: + +```sh +git clone https://git.suboptimal.solutions/hugh/git-webhooks.git +cd git-webhooks +npm install +``` + +## web server + +You'll need to set up a webserver configuration. If you use nginx, start with the example in `nginx.conf` - update the server_name, check the port is correct, and then add it to the conf files: + +```sh +cp nginx.conf /etc/nginx/sites-available/git-webhooks.conf +ln -s /etc/nginx/sites-available/git-webhooks.conf /etc/nginx/sites-enabled/ +``` + +Then [set up an https certificate using certbot](https://certbot.eff.org/). + +## Systemd + +Now update the values in `git-webhooks.env`: + +* `SECRET` is the secret code you will share with your git server. +* `EMAIL_USER`, `EMAIL_PASSWORD`, `SMTP_DOMAIN` should all be available from your mail provider. +* `EMAIL_SEND_ADDRESS` is the address you want to send from. +* `EMAIL_RECEIVE_ADDRESS` is the email address you want to send alerts to +* `APP_PATH` is the URL path to POST to. e.g. "library-map" if you are sending POST requests to `https://example.com/library-map` +* `LOCAL_REPO` is the path of the repository to update on the server. e.g. `/srv/my_awesome_app_repository` + +You'll need to check `git-webhooks.service` is correct for your system. You might need to change the `WorkingDirectory`, for example, if you chose not to create a `webhooks` user. + +Once these files are correct, move both to where we store `systemd` unit files: + +```sh +sudo mv git-webhooks.service git-webhooks.env /etc/systemd/system/ +``` + +Now enable and start the service: + +```sh +sudo systemctl enable git-webhooks.service +sudo systemctl start git-webhooks.service +``` + +Your webhooks server should now be operational! \ No newline at end of file diff --git a/git-webhooks.env b/git-webhooks.env new file mode 100644 index 0000000..e3f98aa --- /dev/null +++ b/git-webhooks.env @@ -0,0 +1,9 @@ +PORT=4040 +SECRET="secret-code" +EMAIL_USER="webhooks@example.com" +EMAIL_PASSWORD="password" +SMTP_DOMAIN="smtp.mailgun.org" +EMAIL_SEND_ADDRESS="webhooks@mg.example.com" +EMAIL_RECEIVE_ADDRESS="alerts@example.com" +APP_PATH="library-map" +LOCAL_REPO="/srv/public_library_map" \ No newline at end of file diff --git a/git-webhooks.service b/git-webhooks.service new file mode 100644 index 0000000..de25b9e --- /dev/null +++ b/git-webhooks.service @@ -0,0 +1,13 @@ +[Unit] +Description=Keeps the webhooks express server running +After=network.target + +[Service] +Type=simple +ExecStart=/usr/bin/node webhooks.js +Restart=on-failure +User=webhooks +WorkingDirectory=/home/webhooks/git-webhooks +EnvironmentFile=/etc/systemd/system/git-webhooks.env +[Install] +WantedBy=multi-user.target \ No newline at end of file diff --git a/nginx.conf b/nginx.conf new file mode 100644 index 0000000..239fd41 --- /dev/null +++ b/nginx.conf @@ -0,0 +1,8 @@ +server { + server_name example.com; + location / { + include proxy_params; + proxy_pass http://localhost:4040; + proxy_read_timeout 90; + } +} \ No newline at end of file diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..4c0ca10 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,714 @@ +{ + "name": "webhooks", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + 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100644 index 0000000..9e4f053 --- /dev/null +++ b/package.json @@ -0,0 +1,17 @@ +{ + "name": "webhooks", + "version": "1.0.0", + "description": "simple server for receiving webhooks and processing them", + "main": "webhooks.js", + "repository": "https://git.suboptimal.solutions/hugh/git-webhooks.git", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "author": "Hugh Rundle (https://www.hughrundle.net)", + "license": "AGPL-3.0-or-later", + "type": "module", + "dependencies": { + "emailjs": "^4.0.3", + "express": "^4.19.2" + } +} diff --git a/webhooks.js b/webhooks.js new file mode 100644 index 0000000..e71067d --- /dev/null +++ b/webhooks.js @@ -0,0 +1,99 @@ +/* jshint esversion: 8 */ +import { promisify } from 'util' +import child_process from 'child_process' +const exec = promisify(child_process.exec) // run child_process.exec as a Promise/async +import { createHmac } from 'crypto' +import express from 'express' +const port = process.env.PORT +import { SMTPClient } from 'emailjs'; + +// express +const app = express() +app.use(express.json()) + + +function sendEmail(msg, trigger) { + const client = new SMTPClient({ + user: process.env.EMAIL_USER, + password: process.env.EMAIL_PASSWORD, + host: process.env.SMTP_DOMAIN, + ssl: true, + }); + + // send the message and get a callback with an error or details of the message that was sent + client.send( + { + text: `Git webhook for ${trigger} has triggered a "git pull" event with the following result:\n\n${msg}`, + from: `Webhook Alerts<${process.env.EMAIL_SEND_ADDRESS}>`, + to: process.env.EMAIL_RECEIVE_ADDRESS, + subject: `Git service triggered a pull for ${trigger}`, + }, + (err, message) => { + console.log(err || message); + } + ); +} + +// function to run git pull +async function gitPull(local_repo, res) { + try { + const { stdout, stderr } = await exec(`cd ${local_repo} && git pull`); + let msg = stderr ? stderr : stdout // message is the error message if there is one, else the stdout + sendEmail(msg, process.env.APP_PATH) + res.status(200).send('Ok') + } catch (err) { + console.error(err) + res.status(500).send('server error - sorry about that') + } +} + +// we are *recieving* POST requests here +app.post(`/${process.env.APP_PATH}`, (req, res) => { + const hmac = createHmac('sha256', process.env.SECRET) + const local_repo = process.env.LOCAL_REPO + hmac.update(JSON.stringify(req.body)) + + // check has signature header and the decrypted signature matches + if (req.get('X-Hub-Signature-256')) { + if ( `sha256=${hmac.digest('hex').toString()}` === req.get('X-Hub-Signature-256') ){ + if (req.body.ref === 'refs/heads/main') { + gitPull(local_repo, res) + } else { + console.log('Ignoring push to non-default branch') + res.status(200).send('Ignoring push to non-default branch') + } + } else { + console.error('signature header received but hash did not match') + res.status(403).send('Signature is missing or does not match') + } + } else { + console.error('Signature missing') + res.status(403).send('Signature is missing or does not match') + } +}) + +// everything else should 404 +app.use(function (req, res) { + res.status(404).send('Nothing here') +}) + +app.listen(port, () => { + const secrets = { + "PORT": process.env.PORT, + "SECRET": process.env.SECRET, + "EMAIL_USER": process.env.EMAIL_USER, + "EMAIL_PASSWORD": process.env.EMAIL_PASSWORD, + "SMTP_DOMAIN": process.env.SMTP_DOMAIN, + "EMAIL_SEND_ADDRESS": process.env.EMAIL_SEND_ADDRESS, + "EMAIL_RECEIVE_ADDRESS": process.env.EMAIL_RECEIVE_ADDRESS, + "APP_PATH": process.env.APP_PATH, + "LOCAL_REPO": process.env.LOCAL_REPO + } + for (let key in secrets) { + if (secrets[key] === undefined || null) { + throw Error(`Missing ${key} from environment values`) + } + } + + console.log(`Webhooks app listening on port ${port}`) +}) \ No newline at end of file