WIP EGroupware tutorial:

-Add popup tutorials player
-List tutorials in sidebox with their titles and thumbnails only

home/inc/class.home_tutorial_ui.inc.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * EGroupware - Tutorial
+ *
+ * @link http://www.egroupware.org
+ * @package home
+ * @author Hadi Nategh [hn@stylite.de]
+ * @copyright (c) 2015 by Stylite AG <info-AT-stylite.de>
+ * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
+ * @version $Id:$
+ */
+	
+class home_tutorial_ui {
+	
+	/**
+	 * Methods callable via menuaction
+	 *
+	 * @var array
+	 */
+	public $public_functions = array(
+		'popup' => true
+	);
+	
+	/**
+	 * Popup window to display youtube video
+	 * @param type $content
+	 */
+	function popup ($content)
+	{
+		//Allow youtube frame to pass the CSP check
+		egw_framework::csp_frame_src_attrs(array('www.youtube.com'));
+		
+		$tmpl = new etemplate_new('home.tutorial');
+		
+		// Get tutorial object id
+		$tuid_indx = explode('-',$_GET['tuid']);
+		
+		// read tutorials json file to fetch data
+		$tutorials = json_decode(self::getJsonData(), true);
+		
+		$content = $tutorials[$tuid_indx[0]][$tuid_indx[1]][$tuid_indx[2]];
+				
+		$tmpl->exec('home.home_tutorial_ui.popup', $content,array(),array(),array(),array(),2);
+	}
+	
+	/**
+	 * Ajax function to get videos links as json
+	 */
+	function ajax_data()
+	{
+		$response = egw_json_response::get();
+		$response->data(json_decode(self::getJsonData()));
+	}
+	
+	/**
+	 * Function to fetch data from tutorials.json file
+	 * @return string returns json string
+	 *
+	 * @TODO: implement tree level caching
+	 */
+	static function getJsonData()
+	{
+		if (!($json = egw_cache::getCache(egw_cache::TREE, 'home', 'egw_tutorial_json')))
+		{
+			$json = file_get_contents('http://www.egroupware.de/videos/tutorials.json');
+			// Cache the json object for one month
+			egw_cache::addCache(egw_cache::TREE, 'home', 'egw_tutorial_json', $json, 3600 * 720);
+		}
+		
+		return $json;
+	}
+}