1 files changed, 20 insertions, 0 deletions
diff --git a/src/App.php b/src/App.php
index c6e8539..7a0c28d 100644
--- a/src/App.php
+++ b/src/App.php
@@ -44,6 +44,26 @@ class App
     try {
       $config = $this->buildConfig($contentRoot . $path);
 
+      // check referrer
+      if (! empty($config['api']['referrer'])) {
+        $referrerDomain = $_SERVER['HTTP_REFERER'] ?? '';
+        $referrerIp = $_SERVER['REMOTE_ADDR'] ?? 0;
+        $referrerIsMatch = false;
+        foreach ($config['api']['referrer'] as $referrer) {
+          if (
+            ($referrer['domain'] ?? $referrerDomain) === $referrerDomain &&
+            ($referrer['ip'] ?? $referrerIp) === $referrerIp
+          ) {
+            $referrerIsMatch = true;
+            break;
+          }
+        }
+
+        if (! $referrerIsMatch) {
+          throw new HttpException('Referrer mismatch', Response::HTTP_UNAUTHORIZED);
+        }
+      }
+
       // check api key
       $apiKey = $_GET['key'] ?? $_POST['key'] ?? null;
       if (empty($apiKey)) {