image.php

Go to the documentation of this file.

<?php
/*
 You may not change or alter any portion of this comment or credits
 of supporting developers from this source code or any supporting source code
 which is considered copyrighted (c) material of the original comment or credit authors.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/

class XoopsCaptchaImage extends XoopsCaptchaMethod
{

    public function isActive()
    {
        if (!extension_loaded('gd')) {
            trigger_error('GD library is not loaded', E_USER_WARNING);
            return false;
        } else {
            $required_functions = array(
                'imagecreatetruecolor' ,
                'imagecolorallocate' ,
                'imagefilledrectangle' ,
                'imagejpeg' ,
                'imagedestroy' ,
                'imageftbbox');
            foreach ($required_functions as $func) {
                if (!function_exists($func)) {
                    trigger_error('Function ' . $func . ' is not defined', E_USER_WARNING);
                    return false;
                }
            }
        }
        return true;
    }

    public function render()
    {
                $xoops_url = \XoopsBaseConfig::get('url');
        $js = "<script type='text/javascript'>
                function xoops_captcha_refresh(imgId)
                {
                    xoopsGetElementById(imgId).src = '" . $xoops_url . "/class/captcha/image/scripts/image.php?refresh='+Math.random();
                }
                </script>";
        $image = $this->loadImage();
        $image .= "<br /><a href=\"javascript: xoops_captcha_refresh('" . ($this->config['name']) . "')\">" . XoopsLocale::CLICK_TO_REFRESH_IMAGE_IF_NOT_CLEAR . "</a>";
        $input = '<input type="text" name="' . $this->config['name'] . '" id="' . $this->config['name'] . '" size="' . $this->config['num_chars'] . '" maxlength="' . $this->config['num_chars'] . '" value="" required>';
        $rule = XoopsLocale::INPUT_LETTERS_IN_THE_IMAGE;
        $rule .= '<br />' . (empty($this->config['casesensitive']) ? XoopsLocale::CODE_IS_CASE_INSENSITIVE : XoopsLocale::CODE_IS_CASE_SENSITIVE);
        if (!empty($this->config['maxattempts'])) {
            $rule .= '<br />' . sprintf(XoopsLocale::F_MAXIMUM_ATTEMPTS, $this->config['maxattempts']);
        }
        return $js . $image . '<br /><br />' . $input . '<br />' . $rule;
    }

    public function loadImage()
    {
                $xoops_url = \XoopsBaseConfig::get('url');
        return '<img id="' . ($this->config["name"]) . '" src="' . $xoops_url . '/class/captcha/image/scripts/image.php" onclick=\'this.src="' . $xoops_url . '/class/captcha/image/scripts/image.php?refresh="+Math.random()' . '\' style="cursor: pointer; vertical-align: middle;" alt="" />';
    }
}