Add Cookie helper class for cookie support detection

refs #7383

library/Icinga/Web/Cookie.php

@@ -0,0 +1,79 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Web;
+
+/**
+ * Helper Class Cookie
+ *
+ * @package Icinga\Web
+ */
+class Cookie
+{
+    /**
+     * The name of the control cookie
+     */
+    const CHECK_COOKIE = '_chc';
+
+    /**
+     * Check whether cookies are supported or not
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        if (! empty($_COOKIE)) {
+            self::cleanupCheck();
+            return true;
+        }
+
+        if (isset($_REQUEST['_checkCookie']) && empty($_COOKIE)) {
+            return false;
+        }
+
+        if (! isset($_REQUEST['_checkCookie'])) {
+            self::provideCheck();
+        }
+
+        return false;
+    }
+
+    /**
+     * Redirect to a given uri
+     *
+     * @param string $uri
+     */
+    public static function redirect($uri)
+    {
+        header('location: ' . $uri);
+        exit(0);
+    }
+
+    /**
+     * Prepare check to detect cookie support
+     */
+    public static function provideCheck()
+    {
+        setcookie(self::CHECK_COOKIE, '1');
+
+        if (parse_url($_SERVER['REQUEST_URI'], PHP_URL_QUERY)) {
+            $requestUri = $_SERVER['REQUEST_URI'] . '&_checkCookie=1';
+        } else {
+            $requestUri = $_SERVER['REQUEST_URI'] . '?_checkCookie=1';
+        }
+
+        self::redirect($requestUri);
+    }
+
+    /**
+     * Cleanup the cookie support check
+     */
+    public static function cleanupCheck()
+    {
+        if (isset($_REQUEST['_checkCookie']) && isset($_COOKIE[self::CHECK_COOKIE])) {
+            $requestUri = preg_replace('/([&|\?]_checkCookie=1)/', '', $_SERVER['REQUEST_URI']);
+            self::redirect($requestUri);
+        }
+    }
+}