From 3024dbd919f6de60c738129a1be4971a709626c0 Mon Sep 17 00:00:00 2001
From: ezn <vo.ezn@leverburns.blue>
Date: Tue, 27 Jun 2023 20:24:23 +0100
Subject: [PATCH] webhook.php

---
 webhook.php | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 webhook.php

diff --git a/webhook.php b/webhook.php
new file mode 100644
index 0000000..4efcdf2
--- /dev/null
+++ b/webhook.php
@@ -0,0 +1,53 @@
+<?php
+
+$secret_key = '123';
+
+// check for POST request
+if ($_SERVER['REQUEST_METHOD'] != 'POST') {
+    error_log('FAILED - not POST - '. $_SERVER['REQUEST_METHOD']);
+    exit();
+}
+
+// get content type
+$content_type = isset($_SERVER['CONTENT_TYPE']) ? strtolower(trim($_SERVER['CONTENT_TYPE'])) : '';
+
+if ($content_type != 'application/json') {
+    error_log('FAILED - not application/json - '. $content_type);
+    exit();
+}
+
+// get payload
+$payload = trim(file_get_contents("php://input"));
+
+if (empty($payload)) {
+    error_log('FAILED - no payload');
+    exit();
+}
+
+// get header signature
+$header_signature = isset($_SERVER['HTTP_X_GITEA_SIGNATURE']) ? $_SERVER['HTTP_X_GITEA_SIGNATURE'] : '';
+
+if (empty($header_signature)) {
+    error_log('FAILED - header signature missing');
+    exit();
+}
+
+// calculate payload signature
+$payload_signature = hash_hmac('sha256', $payload, $secret_key, false);
+
+// check payload signature against header signature
+if ($header_signature !== $payload_signature) {
+    error_log('FAILED - payload signature');
+    exit();
+}
+
+// convert json to array
+$decoded = json_decode($payload, true);
+
+// check for json decode errors
+if (json_last_error() !== JSON_ERROR_NONE) {
+    error_log('FAILED - json decode - '. json_last_error());
+    exit();
+}
+
+// success, do something
\ No newline at end of file