--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Flag.inc.php	Sun Jan 22 19:22:00 2023 +0100
@@ -0,0 +1,93 @@
+<?php
+/**
+ * @file
+ * Displays a flag, in an active or disabled state, depending on parameters
+ */
+
+include_once 'CacheTimeCheck.inc.php';
+
+/// @cond
+$scriptCache = ScriptIncludeCache::instance(__FILE__);
+$scriptCache->includeOnce('Language.inc.php');
+$scriptCache->includeOnce('common-functions.inc.php');
+$scriptCache->includeOnce('Page.inc.php');
+/// @endcond
+
+/**
+ * Functionality for generating a flag based on state options
+ */
+class Flag extends Page
+{
+  private $active;
+  private $lang;
+
+  /**
+   * Constructs a flag object
+   *
+   * @param $masterCache link this objects cache to this masterCache
+   */
+  function __construct($masterCache)
+  {
+    $this->active = $_GET['active'];
+    $lang = $_GET['lang'];
+
+    if(!$lang) {
+      $lang = "no";
+      $langs = Language::accepted();
+      foreach ($langs as $l => $val) {
+	if (file_exists($l)) {
+	  $lang = $l;
+	  break;
+	}
+      }
+    }
+
+
+    $this->lang = $lang;
+    foreach ( [ 'img', '../img' ] as $dir) {
+      $this->name = "${dir}/flag-${lang}";
+      if ($this->active)
+	$this->name .= "-active";
+      $this->name .= ".png";
+      if (file_exists($this->name))
+	break;
+    }
+
+    $cache = new CacheTimeCheck($this->name);
+    $cache->setMaxAge(30*86400);
+    $cache->addParent($masterCache);
+    $this->setCache($cache);
+  }
+
+  function cacheCheck()
+  {
+    return Cacheable::YES;
+  }
+
+  function mayCompress()
+  {
+    return false;
+  }
+
+  function mayValidate()
+  {
+    return false;
+  }
+
+  /**
+   * Produce the actual content
+   */
+  function generateContent()
+  {
+    $flag = loadFile($this->name);
+
+    if (floatval($flag) < 0) {
+      errorPage('Resource not found', 404);
+    }
+    else {
+      $flag = new PageContent($flag);
+      $flag->setHeader('Content-Type', 'image/png');
+      return $flag;
+    }
+  }
+}