diff options
Diffstat (limited to 'system/libraries/drivers/Captcha.php')
| -rw-r--r-- | system/libraries/drivers/Captcha.php | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/system/libraries/drivers/Captcha.php b/system/libraries/drivers/Captcha.php deleted file mode 100644 index a4343e19..00000000 --- a/system/libraries/drivers/Captcha.php +++ /dev/null @@ -1,227 +0,0 @@ -<?php defined('SYSPATH') OR die('No direct access allowed.'); -/** - * Captcha driver class. - * - * $Id: Captcha.php 3769 2008-12-15 00:48:56Z zombor $ - * - * @package Captcha - * @author Kohana Team - * @copyright (c) 2007-2008 Kohana Team - * @license http://kohanaphp.com/license.html - */ -abstract class Captcha_Driver { - - // The correct Captcha challenge answer - protected $response; - - // Image resource identifier and type ("png", "gif" or "jpeg") - protected $image; - protected $image_type = 'png'; - - /** - * Constructs a new challenge. - * - * @return void - */ - public function __construct() - { - // Generate a new challenge - $this->response = $this->generate_challenge(); - - // Store the correct Captcha response in a session - Event::add('system.post_controller', array($this, 'update_response_session')); - } - - /** - * Generate a new Captcha challenge. - * - * @return string the challenge answer - */ - abstract public function generate_challenge(); - - /** - * Output the Captcha challenge. - * - * @param boolean html output - * @return mixed the rendered Captcha (e.g. an image, riddle, etc.) - */ - abstract public function render($html); - - /** - * Stores the response for the current Captcha challenge in a session so it is available - * on the next page load for Captcha::valid(). This method is called after controller - * execution (in the system.post_controller event) in order not to overwrite itself too soon. - * - * @return void - */ - public function update_response_session() - { - Session::instance()->set('captcha_response', sha1(strtoupper($this->response))); - } - - /** - * Validates a Captcha response from a user. - * - * @param string captcha response - * @return boolean - */ - public function valid($response) - { - return (sha1(strtoupper($response)) === Session::instance()->get('captcha_response')); - } - - /** - * Returns the image type. - * - * @param string filename - * @return string|FALSE image type ("png", "gif" or "jpeg") - */ - public function image_type($filename) - { - switch (strtolower(substr(strrchr($filename, '.'), 1))) - { - case 'png': - return 'png'; - - case 'gif': - return 'gif'; - - case 'jpg': - case 'jpeg': - // Return "jpeg" and not "jpg" because of the GD2 function names - return 'jpeg'; - - default: - return FALSE; - } - } - - /** - * Creates an image resource with the dimensions specified in config. - * If a background image is supplied, the image dimensions are used. - * - * @throws Kohana_Exception if no GD2 support - * @param string path to the background image file - * @return void - */ - public function image_create($background = NULL) - { - // Check for GD2 support - if ( ! function_exists('imagegd2')) - throw new Kohana_Exception('captcha.requires_GD2'); - - // Create a new image (black) - $this->image = imagecreatetruecolor(Captcha::$config['width'], Captcha::$config['height']); - - // Use a background image - if ( ! empty($background)) - { - // Create the image using the right function for the filetype - $function = 'imagecreatefrom'.$this->image_type($background); - $this->background_image = $function($background); - - // Resize the image if needed - if (imagesx($this->background_image) !== Captcha::$config['width'] - OR imagesy($this->background_image) !== Captcha::$config['height']) - { - imagecopyresampled - ( - $this->image, $this->background_image, 0, 0, 0, 0, - Captcha::$config['width'], Captcha::$config['height'], - imagesx($this->background_image), imagesy($this->background_image) - ); - } - - // Free up resources - imagedestroy($this->background_image); - } - } - - /** - * Fills the background with a gradient. - * - * @param resource gd image color identifier for start color - * @param resource gd image color identifier for end color - * @param string direction: 'horizontal' or 'vertical', 'random' by default - * @return void - */ - public function image_gradient($color1, $color2, $direction = NULL) - { - $directions = array('horizontal', 'vertical'); - - // Pick a random direction if needed - if ( ! in_array($direction, $directions)) - { - $direction = $directions[array_rand($directions)]; - - // Switch colors - if (mt_rand(0, 1) === 1) - { - $temp = $color1; - $color1 = $color2; - $color2 = $temp; - } - } - - // Extract RGB values - $color1 = imagecolorsforindex($this->image, $color1); - $color2 = imagecolorsforindex($this->image, $color2); - - // Preparations for the gradient loop - $steps = ($direction === 'horizontal') ? Captcha::$config['width'] : Captcha::$config['height']; - - $r1 = ($color1['red'] - $color2['red']) / $steps; - $g1 = ($color1['green'] - $color2['green']) / $steps; - $b1 = ($color1['blue'] - $color2['blue']) / $steps; - - if ($direction === 'horizontal') - { - $x1 =& $i; - $y1 = 0; - $x2 =& $i; - $y2 = Captcha::$config['height']; - } - else - { - $x1 = 0; - $y1 =& $i; - $x2 = Captcha::$config['width']; - $y2 =& $i; - } - - // Execute the gradient loop - for ($i = 0; $i <= $steps; $i++) - { - $r2 = $color1['red'] - floor($i * $r1); - $g2 = $color1['green'] - floor($i * $g1); - $b2 = $color1['blue'] - floor($i * $b1); - $color = imagecolorallocate($this->image, $r2, $g2, $b2); - - imageline($this->image, $x1, $y1, $x2, $y2, $color); - } - } - - /** - * Returns the img html element or outputs the image to the browser. - * - * @param boolean html output - * @return mixed html string or void - */ - public function image_render($html) - { - // Output html element - if ($html) - return '<img alt="Captcha" src="'.url::site('captcha/'.Captcha::$config['group']).'" width="'.Captcha::$config['width'].'" height="'.Captcha::$config['height'].'" />'; - - // Send the correct HTTP header - header('Content-Type: image/'.$this->image_type); - - // Pick the correct output function - $function = 'image'.$this->image_type; - $function($this->image); - - // Free up resources - imagedestroy($this->image); - } - -} // End Captcha Driver
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