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msd2/tracking/piwik/core/ProxyHeaders.php

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+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik;
+
+/**
+ * Proxy headers
+ *
+ */
+class ProxyHeaders
+{
+    /**
+     * Get protocol information, with the exception of HTTPS
+     *
+     * @return string protocol information
+     */
+    public static function getProtocolInformation()
+    {
+        if (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) {
+            return 'SERVER_PORT=443';
+        }
+
+        if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == 'https') {
+            return 'X-Forwarded-Proto';
+        }
+
+        if (isset($_SERVER['HTTP_X_FORWARDED_SCHEME']) && strtolower($_SERVER['HTTP_X_FORWARDED_SCHEME']) == 'https') {
+            return 'X-Forwarded-Scheme';
+        }
+
+        if (isset($_SERVER['HTTP_X_URL_SCHEME']) && strtolower($_SERVER['HTTP_X_URL_SCHEME']) == 'https') {
+            return 'X-Url-Scheme';
+        }
+
+        return null;
+    }
+
+    /**
+     * Get headers present in the HTTP request
+     *
+     * @param array $recognizedHeaders
+     * @return array HTTP headers
+     */
+    private static function getHeaders($recognizedHeaders)
+    {
+        $headers = array();
+
+        foreach ($recognizedHeaders as $header) {
+            if (isset($_SERVER[$header])) {
+                $headers[] = $header;
+            }
+        }
+
+        return $headers;
+    }
+
+    /**
+     * Detect proxy client headers
+     *
+     * @return array Proxy client HTTP headers
+     */
+    public static function getProxyClientHeaders()
+    {
+        return self::getHeaders(array(
+                                     'HTTP_CF_CONNECTING_IP',
+                                     'HTTP_CLIENT_IP',
+                                     'HTTP_X_FORWARDED_FOR',
+                                ));
+    }
+
+    /**
+     * Detect proxy host headers
+     *
+     * @return array Proxy host HTTP headers
+     */
+    public static function getProxyHostHeaders()
+    {
+        return self::getHeaders(array(
+                                     'HTTP_X_FORWARDED_HOST',
+                                ));
+    }
+}