1 files changed, 86 insertions, 0 deletions
diff --git a/library/Icinga/Web/UserAgent.php b/library/Icinga/Web/UserAgent.php
new file mode 100644
index 0000000..71c1a8b
--- /dev/null
+++ b/library/Icinga/Web/UserAgent.php
@@ -0,0 +1,86 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web;
+
+/**
+ * Class UserAgent
+ *
+ * This class helps to get user agent information like OS type and browser name
+ *
+ * @package Icinga\Web
+ */
+class UserAgent
+{
+    /**
+     * $_SERVER['HTTP_USER_AGENT'] output string
+     *
+     * @var string|null
+     */
+    private $agent;
+
+    public function __construct($agent = null)
+    {
+        $this->agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : null;
+
+        if ($agent) {
+            $this->agent = $agent->http_user_agent;
+        }
+    }
+
+    /**
+     * Return $_SERVER['HTTP_USER_AGENT'] output string of given or current device
+     *
+     * @return string
+     */
+    public function getAgent()
+    {
+        return $this->agent;
+    }
+
+    /**
+     * Get Browser name
+     *
+     * @return string Browser name or unknown if not found
+     */
+    public function getBrowser()
+    {
+        // key => regex value
+        $browsers = [
+            "Internet Explorer"    => "/MSIE(.*)/i",
+            "Seamonkey"            => "/Seamonkey(.*)/i",
+            "MS Edge"              => "/Edg(.*)/i",
+            "Opera"                => "/Opera(.*)/i",
+            "Opera Browser"        => "/OPR(.*)/i",
+            "Chromium"             => "/Chromium(.*)/i",
+            "Firefox"              => "/Firefox(.*)/i",
+            "Google Chrome"        => "/Chrome(.*)/i",
+            "Safari"               => "/Safari(.*)/i"
+        ];
+        //TODO find a way to return also the version of the browser
+        foreach ($browsers as $browser => $regex) {
+            if (preg_match($regex, $this->agent)) {
+                return $browser;
+            }
+        }
+
+        return 'unknown';
+    }
+
+    /**
+     * Get Operating system information
+     *
+     * @return string os information
+     */
+    public function getOs()
+    {
+        // get string before the first appearance of ')'
+        $device = strstr($this->agent, ')', true);
+        if (! $device) {
+            return 'unknown';
+        }
+
+        // return string after the first appearance of '('
+        return  substr($device, strpos($device, '(') + 1);
+    }
+}