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                <?php  | 
            
                            
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                // This file is part of Moodle - http://moodle.org/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                //  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // Moodle is free software: you can redistribute it and/or modify  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // it under the terms of the GNU General Public License as published by  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // the Free Software Foundation, either version 3 of the License, or  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // (at your option) any later version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                //  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // Moodle is distributed in the hope that it will be useful,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // but WITHOUT ANY WARRANTY; without even the implied warranty of  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // GNU General Public License for more details.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                //  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // You should have received a copy of the GNU General Public License  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Authentication Plugin: External Webservice Authentication  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Checks against an external webservice.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package    auth_ws  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author     Daniel Neis Araujo  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license    http://www.gnu.org/copyleft/gpl.html GNU Public License  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                defined('MOODLE_INTERNAL') || die(); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                require_once($CFG->libdir.'/authlib.php');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * External webservice authentication plugin.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class auth_plugin_ws extends auth_plugin_base { | 
            
                            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Constructor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->authtype = 'ws';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->config = get_config('auth_ws'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($this->config->default_params) && !empty($this->config->default_params)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $params = explode(',', $this->config->default_params); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $defaultparams = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($params as $p) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                list($paramname, $value) = explode(':', $p); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $defaultparams[$paramname] = $value;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->config->ws_default_params = $defaultparams;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->config->ws_default_params = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns true if the username and password work and false if they are  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * wrong or don't exist.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $username The username  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $password The password  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool Authentication success or failure.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function user_login($username, $password) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $functionname = $this->config->auth_function;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $params  = array($this->config->auth_function_username_paramname => $username,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                         $this->config->auth_function_password_paramname => $password);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $result = $this->call_ws($this->config->auth_serverurl, $functionname, $params);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return ($result[$this->config->auth_function_resultClass][$this->config->auth_function_resultField] == true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * This plugin is intended only to authenticate users.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * User synchronization must be done by external service,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * using Moodle's webservices.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param progress_trace $trace  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param bool $do_updates  Optional: set to true to force an update of existing accounts  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return int 0 means success, 1 means failure  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function sync_users(progress_trace $trace, $do_updates=false) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function get_userinfo($username) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function call_ws($serverurl, $functionname, $params = array()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $serverurl = $serverurl . '?wsdl';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $params = array_merge($this->config->ws_default_params, $params);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $client = new SoapClient($serverurl);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        try { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $resp = $client->__soapCall($functionname, array($params));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $resp;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } catch (Exception $e) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo "Exception:\n";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo $e->getMessage();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo "===\n";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function prevent_local_passwords() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns true if this authentication plugin is "internal".  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     * Internal plugins use password hashes from Moodle user table for authentication.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function is_internal() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Indicates if moodle should automatically update internal user  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * records with data from external sources using the information  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * from auth_plugin_base::get_userinfo().  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * The external service is responsible to update user records.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool true means automatically copy data from ext to user table  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                    public function is_synchronised_with_external() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                     * Returns true if this authentication plugin can change the user's  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                     * password.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                    public function can_change_password() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                     * Returns the URL for changing the user's pw, or empty if the default can  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                     * be used.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                                                     | 
                
                 | 
                     * @return moodle_url  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                    public function change_password_url() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                        if (isset($this->config->changepasswordurl) && !empty($this->config->changepasswordurl)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                            return new moodle_url($this->config->changepasswordurl);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                            return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                     * Returns true if plugin allows resetting of internal password.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                    public function can_reset_password() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.