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Hugh Rundle 2024-08-01 18:19:05 +10:00
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README.md
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# git-webhooks # 🪝 git-webhooks
Code for running a webhook service to receive webhooks sent by a git server. 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.

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curl -H "X-Hub-Signature-256:sha256=d32b2f468f839b3a8e855d9dfd9f4032b998490abec44ea5fcc76ea940bdef63" -d '{"ref":"refs/heads/main"}' -H "Content-Type: application/json" -X POST localhost:4040/library-map

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## 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!

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git-webhooks.env Normal file
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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"

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git-webhooks.service Normal file
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[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

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nginx.conf Normal file
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server {
server_name example.com;
location / {
include proxy_params;
proxy_pass http://localhost:4040;
proxy_read_timeout 90;
}
}

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17
package.json Normal file
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@ -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 <hugh@hughrundle.net> (https://www.hughrundle.net)",
"license": "AGPL-3.0-or-later",
"type": "module",
"dependencies": {
"emailjs": "^4.0.3",
"express": "^4.19.2"
}
}

99
webhooks.js Normal file
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@ -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}`)
})