Add CAS logout button as a plugin and logout file

main/auth/cas/logout.php

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+<?php
+    /* For licensing terms, see /license.txt */
+    /*
+    Call this file to disconnect from CAS session.
+    logoutWithUrl() not used because with CAS v3 you cannot redirect your logout to a specific URL
+    because of security reason.
+    */
+    require('../..//inc/global.inc.php');
+    require_once (api_get_path(LIBRARY_PATH).'events.lib.inc.php');
+    require_once('authcas.php');
+
+
+    global $cas_auth_ver, $cas_auth_server, $cas_auth_port, $cas_auth_uri; 
+
+	phpCAS::client($cas_auth_ver,$cas_auth_server,$cas_auth_port,$cas_auth_uri);
+    phpCAS::logout();
+    
+?>

plugin/add_cas_logout_button/css.css

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+    .cas_plugin_image {
+        float:left; 
+        height:50px;
+        margin: 0px 5px 5px 0px;        
+    }
+    .cas_plugin_comm {
+        font-style:italic;
+    }
+    .cas_plugin_clear {
+        clear:both;
+        height:1px;
+    }

plugin/add_cas_logout_button/index.php

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+<?php
+// Show the CAS button to logout to your CAS session
+global $_user;
+$_template['show_message']   = false;
+
+if (!api_is_anonymous() && api_get_setting('cas_activate') == 'true' && $_user['auth_source'] == CAS_AUTH_SOURCE) {
+    $_template['show_message']   = true;
+    // the default title
+    $logout_label = "Deconnexion de CAS";
+    if (!empty($plugin_info['settings']['add_cas_logout_button_cas_logout_label'])) {
+        $logout_label = api_htmlentities($plugin_info['settings']['add_cas_logout_button_cas_logout_label']);
+    }
+    // the comm
+    $logout_comment = api_htmlentities($plugin_info['settings']['add_cas_logout_button_cas_logout_comment']);;
+    // URL of the image
+    $logout_image_url = $plugin_info['settings']['add_cas_logout_button_cas_logout_image_url'];
+    
+    $_template['logout_label'] = $logout_label;
+    $_template['logout_comment'] = $logout_comment;
+    $_template['logout_image_url'] = $logout_image_url;
+}

plugin/add_cas_logout_button/plugin.php

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+<?php
+/**
+ * This script is a configuration file for the date plugin. You can use it as a master for other platform plugins (course plugins are slightly different).
+ * These settings will be used in the administration interface for plugins (Chamilo configuration settings->Plugins)
+ * @package chamilo.plugin
+ * @author Julio Montoya <gugli100@gmail.com>
+ */
+/**
+ * Plugin details (must be present)
+ */
+
+
+
+//the plugin title
+$plugin_info['title']      = 'Add a button to logout from CAS';
+
+//the comments that go with the plugin
+$plugin_info['comment']     = "If CAS is activated, this plugin add a text and a button on the user page to logout from a CAS session. Configure plugin to add title, comment and logo.";
+//the plugin version
+$plugin_info['version']     = '1.0';
+//the plugin author
+$plugin_info['author']      = 'Hubert Borderiou';
+//the plugin configuration
+$form = new FormValidator('add_cas_button_form');
+$form->addElement('text', 'cas_logout_label', 'CAS logout title', '');
+$form->addElement('text', 'cas_logout_comment', 'CAS logout description', '');
+$form->addElement('text', 'cas_logout_image_url', 'Logo URL if any (image, 50px height)');
+$form->addElement('style_submit_button', 'submit_button', get_lang('Save'));  
+//get default value for form
+$tab_default_add_cas_logout_button_cas_logout_label = api_get_setting('add_cas_logout_button_cas_logout_label');
+$tab_default_add_cas_logout_button_cas_logout_comment = api_get_setting('add_cas_logout_button_cas_logout_comment');
+$tab_default_add_cas_logout_button_cas_logout_image_url = api_get_setting('add_cas_logout_button_cas_logout_image_url');
+$defaults['cas_logout_label'] = $tab_default_add_cas_logout_button_cas_logout_label['add_cas_logout_button'];
+$defaults['cas_logout_comment'] = $tab_default_add_cas_logout_button_cas_logout_comment['add_cas_logout_button'];
+$defaults['cas_logout_image_url'] = $tab_default_add_cas_logout_button_cas_logout_image_url['add_cas_logout_button'];
+$form->setDefaults($defaults);
+//display form
+$plugin_info['settings_form'] = $form;
+
+//set the smarty templates that are going to be used
+$plugin_info['templates']   = array('template.tpl');

plugin/add_cas_logout_button/readme.txt

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+README
+<br/><br/>
+This plugin add a button to allow user to logout to his CAS session.<br/><br/>
+You have to activate your CAS connection to display this button.<br/>
+You have to configure your CAS connection to have the button works.<br/>
+To activate and configure CAS, for your Chamilo platform, go to Administration > Configuration settings > CAS<br/>
+This plugin has been design to be added in the menu_top region, but you can put it where you want.<br/>

plugin/add_cas_logout_button/template.tpl

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+{* 
+    This is a Chamilo plugin using Smarty you can use handy shorcuts like:
+    
+    1. Shortcuts 
+    
+    $_p = url chamilo paths
+    $_u = user information of the current user
+    
+    2. i18n
+    
+    You can use i18n variables just use this syntax:
+    
+    {"HelloWorld"|get_lang}
+    
+    Now you can add your variables in the main/lang/english/ or main/lang/spanish/ for example in spanish:    
+    $HelloWorld = "Hola Mundo";
+    
+    3. Portal settings
+    
+        You can access the portal settings using:
+        {"siteName"|api_get_setting}
+        For more settings check the settings_current database
+        
+    4. Read more
+        You can also see more examples in the the main/template/default/layout files
+        
+    5. {$_p|var_dump} pour les path {$_u|var_dump} pour info de  l'utilisateur loggé
+*}
+
+{if $add_cas_logout_button.show_message}
+    <link href="{$_p.web_plugin}/add_cas_logout_button/css.css" rel="stylesheet" type="text/css"> 
+    <div class="well">
+        {if $add_cas_logout_button.logout_image_url}
+            <img src="{$add_cas_logout_button.logout_image_url}" class='cas_plugin_image'/>
+        {/if}
+        <h4>{$add_cas_logout_button.logout_label}</h4>
+        {if $add_cas_logout_button.logout_image_url}
+            <div class='cas_plugin_clear'>&nbsp;</div>
+        {/if}
+        <div class='cas_plugin_comm'>{$add_cas_logout_button.logout_comment}</div>
+        <button class="btn" onclick="javascript:self.location.href='main/auth/cas/logout.php'">{"Logout"|get_lang}</button>    
+        
+    </div>
+{/if}