Added the script to handle the deploy hooks

rulez/github-deploy-hook.php

@@ -0,0 +1,65 @@
+<?php
+
+function cidr_match($ip, $cidr)
+{
+    list($subnet, $mask) = explode('/', $cidr);
+
+    if ((ip2long($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long($subnet))
+    {
+        return true;
+    }
+
+    return false;
+}
+
+function get_allowed_ips()
+{
+	/** Get the list of allowed github server to trigger deploys */
+	$options = array(
+		'http' => array(
+			'header' => "User-Agent: pouet.net"
+		)
+	);
+
+	$context = stream_context_create($options);
+	$raw = file_get_contents('https://api.github.com/meta', false, $context);
+	$json = json_decode($raw);
+
+	return $json->hooks;
+}
+
+function is_remote_ip_allowed()
+{
+	$valid_ip = false;
+	foreach (get_allowed_ips() as $ip)
+	{
+		if (cidr_match($_SERVER['REMOTE_ADDR'], $ip))
+		{
+			$valid_ip = true;
+		}
+	}
+
+	return $valid_ip;
+}
+
+// Are we getting a request from github ?
+if (!is_remote_ip_allowed())
+{
+	exit(0);
+}
+
+try
+{
+	// Try to get a workable structure out of the github request
+	$payload = json_decode(stripslashes($_REQUEST['payload']));
+}
+catch(Exception $e)
+{
+	exit(0);
+}
+
+if ($payload->after)
+{
+	// Put the latest commit a text file to trigger the next deploy
+	file_put_contents('../REMOTE_COMMIT', $payload->after);
+}