1 files changed, 118 insertions, 0 deletions
diff --git a/lib/classes/UpdateInformation.php b/lib/classes/UpdateInformation.php
new file mode 100644
index 0000000..959ef72
--- /dev/null
+++ b/lib/classes/UpdateInformation.php
@@ -0,0 +1,118 @@
+<?php
+/*
+ * Copyright (c) 2011  Rasmus Fuhse
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+/**
+ * Class to set information that should be given to javascript.
+ *
+ * For a plugin to hand the information "test" to the javascript-function
+ * STUDIP.myplugin.myfunction just put the line:
+ *  if (UpdateInformation::isCollecting()) {
+ *      UpdateInformation::setInformation("myplugin.myfunction", "test");
+ *  }
+ *
+ * @author Rasmus Fuhse
+ */
+class UpdateInformation
+{
+    protected static $infos = [];
+    protected static $collecting = null;
+    protected static $request = null;
+
+    /**
+     * Returns the timestamp of the beginning of the run before.
+     * Use this to only partially update new stuff.
+     *
+     * @return int Timestamp of the last run
+     */
+    public static function getTimestamp()
+    {
+        return Request::get('server_timestamp');
+    }
+
+    /**
+     * Extracts updater data from request
+     *
+     * @return Array Request data (may be empty if no data is present)
+     */
+    protected static function getRequest()
+    {
+        if (self::$request === null) {
+            self::$request = Request::getArray('page_info');
+        }
+        return self::$request ?: [];
+    }
+
+    /**
+     * Checks whether the request has data for the given index.
+     *
+     * @return bool indicating whether there is data present for the given index
+     */
+    public static function hasData($index)
+    {
+        $request = self::getRequest();
+        return isset($request[$index]);
+    }
+
+    /**
+     * Returns request data for the given index.
+     *
+     * @param String $index Index to get the request data for
+     * @return mixed Array with request data or null if index is invalid
+     */
+    public static function getData($index)
+    {
+        $request = self::getRequest();
+        return $request[$index] ?: null;
+    }
+
+    /**
+     * Gives information to the buffer for the javascript. The first parameter is
+     * the name of the corresponding javascript-function minus the "STUDIP"
+     * and the second parameter is the value handed to that function.
+     * @param string $js_function : "test.testfunction" to get the JS-function "STUDIP.test.testfunction(information);"
+     * @param mixed $information : anything that could be translated into a json-object
+     */
+    public static function setInformation($js_function, $information)
+    {
+        self::$infos[$js_function] = $information;
+    }
+
+    /**
+     * returns the information to give it to javascript
+     * @return array
+     */
+    public static function getInformation()
+    {
+        return self::$infos;
+    }
+
+    /**
+     * returns if this request is a request, that wants to collect information
+     * to hand it to javascript. Ask for this in your SystemPlugin-constructor.
+     * @return: boolean
+     */
+    public static function isCollecting()
+    {
+        if (self::$collecting === null) {
+            $page = $_SERVER['REQUEST_URI'];
+            if (mb_strpos($page, "?") !== false) {
+                $page = mb_substr($page, 0, mb_strpos($page, "?"));
+            }
+            self::$collecting = (mb_stripos($page, "dispatch.php/jsupdater/get") !== false);
+
+            // If we are collecting, store the current timestamp
+            if (self::$collecting) {
+                self::$infos['server_timestamp'] = time();
+            }
+        }
+        return self::$collecting;
+    }
+}
+