First Code upload

.env-sample

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+SECRET_KEY=""

.gitignore

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 node_modules/
+.env
+package-lock.json

index.js

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+const express = require('express')
+const crypto = require('crypto')
+const bodyParser = require('body-parser')
+require('dotenv').config()
+const SECRET = process.env.SECRET_KEY
+
+const app = express()
+const port = 9000
+
+const options = {
+    inflate: true,
+    limit: '100kb',
+    type: 'application/json',
+}
+app.use(bodyParser.raw(options))
+
+app.post('/buildhook', (req, res) => {
+    const signature = req.headers['x-gitea-signature']
+    if (!signature) {
+        console.error('x-gitea-signature missing')
+        return res.send()
+    }
+
+    const hmac = crypto.createHmac('sha256', SECRET)
+    hmac.update(req.body)
+
+    const payload_signature = hmac.digest('hex')
+    if (signature !== payload_signature) {
+        console.error('signature !== payload_signature')
+        return res.send()
+    }
+
+    const json = JSON.parse(req.body.toString())
+    console.log('json')
+    console.log(json)
+    
+    // SIGNATURES MATCHES, do your thing here.
+    
+    res.send('success')
+})
+
+app.listen(port, () => {
+  console.log(`Example app listening at http://localhost:${port}`)
+})

package.json

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+{
+  "name": "expressbuild",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js",
+    "dev": "nodemon index.js"
+  },
+  "author": "Thomas Cole",
+  "license": "MIT",
+  "dependencies": {
+    "dotenv": "^14.2.0",
+    "express": "^4.17.2",
+    "nodemon": "^2.0.15"
+  }
+}