Create hiddentool.php

helper/hiddentool.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * @file hiddentool.php
+ * @created_on 2021-05-24
+ * @updated_on 2021-05-24
+ * @author Go Namhyeon <gnh1201@gmail.com>
+ * @brief Tools for Hidden Services (e.g. Tor, I2P, etc...)
+ */
+
+if (!is_fn("detect_hidden_service")) {
+    function detect_hidden_service() {
+	    $score = 0;
+
+        $suffixes = array(".onion", ".i2p");
+        $forwarded_host = get_header_value("X-Forwarded-Host");
+        if (!empty($forwarded_host)) {
+            if (in_array(end(explode('.', $forwarded_host)), $suffixes)) {
+                $score += 1;
+            }
+        }
+        
+        return $score;
+    };
+}