Add a CAS authentification login button in the login page if CAS activated. Done as a plugin.

plugin/add_cas_login_button/css.css

@@ -0,0 +1,12 @@
+    .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_login_button/index.php

@@ -0,0 +1,21 @@
+<?php
+// Show the CAS button to login using CAS
+
+$_template['show_message']   = false;
+
+if (api_is_anonymous() && api_get_setting('cas_activate') == 'true') {
+    $_template['show_message']   = true;
+    // the default title
+    $button_label = "Connexion via CAS";
+    if (!empty($plugin_info['settings']['add_cas_login_button_cas_button_label'])) {
+        $button_label = api_htmlentities($plugin_info['settings']['add_cas_login_button_cas_button_label']);
+    }
+    // the comm
+    $comm_label = api_htmlentities($plugin_info['settings']['add_cas_login_button_cas_button_comment']);;
+    // URL of the image
+    $url_label = $plugin_info['settings']['add_cas_login_button_cas_image_url'];
+    
+    $_template['button_label'] = $button_label;
+    $_template['comm_label'] = $comm_label;
+    $_template['url_label'] = $url_label;
+}

plugin/add_cas_login_button/plugin.php

@@ -0,0 +1,41 @@
+<?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
+$plugin_info['title']      = 'Add a button to login using CAS';
+
+//the comments that go with the plugin
+$plugin_info['comment']     = "If CAS is activated, this plugin add a text and a button on the login page to login with CAS. 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_button_label', 'CAS connexion title', '');
+$form->addElement('text', 'cas_button_comment', 'CAS connexion description', '');
+$form->addElement('text', 'cas_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_login_button_cas_button_label = api_get_setting('add_cas_login_button_cas_button_label');
+$tab_default_add_cas_login_button_cas_button_comment = api_get_setting('add_cas_login_button_cas_button_comment');
+$tab_default_add_cas_login_button_cas_image_url = api_get_setting('add_cas_login_button_cas_image_url');
+$defaults['cas_button_label'] = $tab_default_add_cas_login_button_cas_button_label['add_cas_login_button'];
+$defaults['cas_button_comment'] = $tab_default_add_cas_login_button_cas_button_comment['add_cas_login_button'];
+$defaults['cas_image_url'] = $tab_default_add_cas_login_button_cas_image_url['add_cas_login_button'];
+$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_login_button/readme.txt

@@ -0,0 +1,7 @@
+README
+
+This plugin add a button to allow user to login to Chamilo with CAS authentification.
+You have to activate your CAS connection to display this button.
+You have to configure your CAS connection to have the button works.
+To activate and configure CAS, for your Chamilo platform, go to Administration > Configuration settings > CAS
+This plugin has been done to be added in the login_top region, but you can put it where you want.

plugin/add_cas_login_button/template.tpl

@@ -0,0 +1,44 @@
+{* 
+    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 $add_cas_login_button.show_message}
+    <link href="{$_p.web_plugin}/add_cas_login_button/css.css" rel="stylesheet" type="text/css"> 
+    <div class="well">
+        {if $add_cas_login_button.url_label}
+            <img src="{$add_cas_login_button.url_label}" class='cas_plugin_image'/>
+        {/if}
+        <h4>{$add_cas_login_button.button_label}</h4>
+        {if $add_cas_login_button.url_label}
+            <div class='cas_plugin_clear'>&nbsp;</div>
+        {/if}
+        <div class='cas_plugin_comm'>{$add_cas_login_button.comm_label}</div>
+        <button type="submit" name="submitAuth" class="btn" onclick="javascript:self.location.href='main/auth/cas/logincas.php'">{"LoginEnter"|get_lang}</button>    
+    </div>
+{/if}