/php/lib/forms/signature_simulator_form.class.php

<?php
namespace webservice;

use common\libraries\FormValidator;
use common\libraries\Translation;
use common\libraries\Utilities;
use common\libraries\ChamiloWebserviceAuthentication;

/**
 * Form for signature simulator
 * @package webservice.php.lib.forms
 * @author Alexander Van Paemel
 */
class SignatureSimulatorForm extends FormValidator
{
    private $user;
    
    function __construct($user, $action)
    {
        parent :: __construct('signature_properties', 'post', $action);
        $this->user = $user;
        
        $this->build_form();
        $this->setDefaults();
    }
    
    function build_form()
    {
        $this->addElement('static', 'username', Translation :: get('Username'));
        $this->addElement('static', 'password', Translation :: get('Password'));
        $this->addElement('static', 'security_token', Translation :: get('SecurityToken'));
        
        $this->addElement('text', 'nonce', Translation :: get('Nonce'));
        $this->addRule('nonce', Translation :: get('ThisFieldIsRequired', null, Utilities :: COMMON_LIBRARIES), 'required');
        
        $this->addElement('text', 'timestamp', Translation :: get('Timestamp'));
        $this->addRule('timestamp', Translation :: get('ThisFieldIsRequired', null, Utilities :: COMMON_LIBRARIES), 'required');
        
        $this->addElement('text', 'ip', Translation :: get('IP'));
        $this->addRule('ip', Translation :: get('ThisFieldIsRequired', null, Utilities :: COMMON_LIBRARIES), 'required');
        
        $buttons[] = $this->createElement('style_submit_button', 'submit', Translation :: get('Submit', null, Utilities :: COMMON_LIBRARIES), array('class' => 'positive update'));
        $buttons[] = $this->createElement('style_reset_button', 'reset', Translation :: get('Reset', null, Utilities :: COMMON_LIBRARIES), array('class' => 'normal empty'));
        $this->addGroup($buttons, 'buttons', null, '&nbsp;', false);
    }
    
    function setDefaults($defaults = array ()) 
    {
        $defaults['username'] = $this->user->get_username();
        $defaults['password'] = '*****';
        $defaults['security_token'] = $this->user->get_security_token();
        $defaults['nonce'] = uniqid();
        $defaults['ip'] = $_SERVER[ChamiloWebserviceAuthentication :: PARAM_REMOTE_ADDRESS];
        $defaults['timestamp'] = time();
        parent :: setDefaults($defaults);
    }
    
    function calculate_signature()
    {
        $values = $this->exportValues();
        
	$base_text = $this->user->get_username() . '&' . $values['nonce'] . '&' . $this->user->get_password() 
                . '&' . $values['timestamp'] . '&' . $values['ip'];
        
        $secret_key = $this->user->get_security_token();

        return hash_hmac(ChamiloWebserviceAuthentication :: PARAM_HASH_ALGORITHM, $base_text, $secret_key);
    }
}

?>