class.ilSecurImage.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once 'Services/Captcha/classes/class.ilSecurImageUtil.php';

class ilSecurImage
{
        const MAX_CAPTCHA_IMG_WIDTH = 430;

        const MAX_CAPTCHA_IMG_HEIGHT = 160;

        protected $image_width = 0;

        protected $image_height = 0;

        protected $securimage;

        protected static $supported_audio_languages = array(
                'fr', 'de'
        );

        public function __construct()
        {
                ilSecurImageUtil::includeSecurImage();
                $this->securimage = new Securimage();
                if(!function_exists("imagettftext"))
                {
                        $this->securimage->use_gd_font = true;
                }

                $this->securimage->num_lines = 3;
        }

        public function getSecureImageObject()
        {
                return $this->securimage;
        }

        public function check($a_input)
        {
                return $this->securimage->check($a_input);
        }

        public function showImage()
        {
                chdir(ilSecurImageUtil::getDirectory());
                $this->securimage->show();
        }

        public function outputAudioFile()
        {
                global $lng;
                
                chdir(ilSecurImageUtil::getDirectory());
                if(
                        $lng->lang_key != 'en' &&
                        in_array($lng->lang_key, self::$supported_audio_languages)
                )
                {
                        $this->securimage->audio_path = $this->securimage->securimage_path . '/audio/' . $lng->lang_key . '/';
                }
                $this->securimage->outputAudioFile();
        }

        public function setImageHeight($image_height)
        {
                if(!is_numeric($image_height) || $image_height > self::MAX_CAPTCHA_IMG_HEIGHT)
                {
                        throw new InvalidArgumentException('Please provide a valid image height (numeric value > 0 and <= ' . self::MAX_CAPTCHA_IMG_HEIGHT);
                }
                $this->image_height = $image_height;
        }

        public function getImageHeight()
        {
                return $this->image_height;
        }

        public function setImageWidth($image_width)
        {
                if(!is_numeric($image_width) || $image_width > self::MAX_CAPTCHA_IMG_WIDTH)
                {
                        throw new InvalidArgumentException('Please provide a valid image width (numeric value > 0 and <= ' . self::MAX_CAPTCHA_IMG_WIDTH);
                }
                $this->image_width = $image_width;
        }

        public function getImageWidth()
        {
                return $this->image_width;
        }
}