--- /dev/null
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * Captcha library.
+ *
+ * $Id: Captcha.php 4072 2009-03-13 17:20:38Z jheathco $
+ *
+ * @package Captcha
+ * @author Kohana Team
+ * @copyright (c) 2007-2008 Kohana Team
+ * @license http://kohanaphp.com/license.html
+ */
+class Captcha_Core {
+
+ // Captcha singleton
+ protected static $instance;
+
+ // Style-dependent Captcha driver
+ protected $driver;
+
+ // Config values
+ public static $config = array
+ (
+ 'style' => 'basic',
+ 'width' => 150,
+ 'height' => 50,
+ 'complexity' => 4,
+ 'background' => '',
+ 'fontpath' => '',
+ 'fonts' => array(),
+ 'promote' => FALSE,
+ );
+
+ /**
+ * Singleton instance of Captcha.
+ *
+ * @return object
+ */
+ public static function instance()
+ {
+ // Create the instance if it does not exist
+ empty(Captcha::$instance) and new Captcha;
+
+ return Captcha::$instance;
+ }
+
+ /**
+ * Constructs and returns a new Captcha object.
+ *
+ * @param string config group name
+ * @return object
+ */
+ public static function factory($group = NULL)
+ {
+ return new Captcha($group);
+ }
+
+ /**
+ * Constructs a new Captcha object.
+ *
+ * @throws Kohana_Exception
+ * @param string config group name
+ * @return void
+ */
+ public function __construct($group = NULL)
+ {
+ // Create a singleton instance once
+ empty(Captcha::$instance) and Captcha::$instance = $this;
+
+ // No config group name given
+ if ( ! is_string($group))
+ {
+ $group = 'default';
+ }
+
+ // Load and validate config group
+ if ( ! is_array($config = Kohana::config('captcha.'.$group)))
+ throw new Kohana_Exception('captcha.undefined_group', $group);
+
+ // All captcha config groups inherit default config group
+ if ($group !== 'default')
+ {
+ // Load and validate default config group
+ if ( ! is_array($default = Kohana::config('captcha.default')))
+ throw new Kohana_Exception('captcha.undefined_group', 'default');
+
+ // Merge config group with default config group
+ $config += $default;
+ }
+
+ // Assign config values to the object
+ foreach ($config as $key => $value)
+ {
+ if (array_key_exists($key, Captcha::$config))
+ {
+ Captcha::$config[$key] = $value;
+ }
+ }
+
+ // Store the config group name as well, so the drivers can access it
+ Captcha::$config['group'] = $group;
+
+ // If using a background image, check if it exists
+ if ( ! empty($config['background']))
+ {
+ Captcha::$config['background'] = str_replace('\\', '/', realpath($config['background']));
+
+ if ( ! is_file(Captcha::$config['background']))
+ throw new Kohana_Exception('captcha.file_not_found', Captcha::$config['background']);
+ }
+
+ // If using any fonts, check if they exist
+ if ( ! empty($config['fonts']))
+ {
+ Captcha::$config['fontpath'] = str_replace('\\', '/', realpath($config['fontpath'])).'/';
+
+ foreach ($config['fonts'] as $font)
+ {
+ if ( ! is_file(Captcha::$config['fontpath'].$font))
+ throw new Kohana_Exception('captcha.file_not_found', Captcha::$config['fontpath'].$font);
+ }
+ }
+
+ // Set driver name
+ $driver = 'Captcha_'.ucfirst($config['style']).'_Driver';
+
+ // Load the driver
+ if ( ! Kohana::auto_load($driver))
+ throw new Kohana_Exception('core.driver_not_found', $config['style'], get_class($this));
+
+ // Initialize the driver
+ $this->driver = new $driver;
+
+ // Validate the driver
+ if ( ! ($this->driver instanceof Captcha_Driver))
+ throw new Kohana_Exception('core.driver_implements', $config['style'], get_class($this), 'Captcha_Driver');
+
+ Kohana::log('debug', 'Captcha Library initialized');
+ }
+
+ /**
+ * Validates a Captcha response and updates response counter.
+ *
+ * @param string captcha response
+ * @return boolean
+ */
+ public static function valid($response)
+ {
+ // Maximum one count per page load
+ static $counted;
+
+ // User has been promoted, always TRUE and don't count anymore
+ if (Captcha::instance()->promoted())
+ return TRUE;
+
+ // Challenge result
+ $result = (bool) Captcha::instance()->driver->valid($response);
+
+ // Increment response counter
+ if ($counted !== TRUE)
+ {
+ $counted = TRUE;
+
+ // Valid response
+ if ($result === TRUE)
+ {
+ Captcha::instance()->valid_count(Session::instance()->get('captcha_valid_count') + 1);
+ }
+ // Invalid response
+ else
+ {
+ Captcha::instance()->invalid_count(Session::instance()->get('captcha_invalid_count') + 1);
+ }
+ }
+
+ return $result;
+ }
+
+ /**
+ * Gets or sets the number of valid Captcha responses for this session.
+ *
+ * @param integer new counter value
+ * @param boolean trigger invalid counter (for internal use only)
+ * @return integer counter value
+ */
+ public function valid_count($new_count = NULL, $invalid = FALSE)
+ {
+ // Pick the right session to use
+ $session = ($invalid === TRUE) ? 'captcha_invalid_count' : 'captcha_valid_count';
+
+ // Update counter
+ if ($new_count !== NULL)
+ {
+ $new_count = (int) $new_count;
+
+ // Reset counter = delete session
+ if ($new_count < 1)
+ {
+ Session::instance()->delete($session);
+ }
+ // Set counter to new value
+ else
+ {
+ Session::instance()->set($session, (int) $new_count);
+ }
+
+ // Return new count
+ return (int) $new_count;
+ }
+
+ // Return current count
+ return (int) Session::instance()->get($session);
+ }
+
+ /**
+ * Gets or sets the number of invalid Captcha responses for this session.
+ *
+ * @param integer new counter value
+ * @return integer counter value
+ */
+ public function invalid_count($new_count = NULL)
+ {
+ return $this->valid_count($new_count, TRUE);
+ }
+
+ /**
+ * Resets the Captcha response counters and removes the count sessions.
+ *
+ * @return void
+ */
+ public function reset_count()
+ {
+ $this->valid_count(0);
+ $this->valid_count(0, TRUE);
+ }
+
+ /**
+ * Checks whether user has been promoted after having given enough valid responses.
+ *
+ * @param integer valid response count threshold
+ * @return boolean
+ */
+ public function promoted($threshold = NULL)
+ {
+ // Promotion has been disabled
+ if (Captcha::$config['promote'] === FALSE)
+ return FALSE;
+
+ // Use the config threshold
+ if ($threshold === NULL)
+ {
+ $threshold = Captcha::$config['promote'];
+ }
+
+ // Compare the valid response count to the threshold
+ return ($this->valid_count() >= $threshold);
+ }
+
+ /**
+ * Returns or outputs the Captcha challenge.
+ *
+ * @param boolean TRUE to output html, e.g. <img src="#" />
+ * @return mixed html string or void
+ */
+ public function render($html = TRUE)
+ {
+ return $this->driver->render($html);
+ }
+
+ /**
+ * Magically outputs the Captcha challenge.
+ *
+ * @return mixed
+ */
+ public function __toString()
+ {
+ return $this->render();
+ }
+
+} // End Captcha Class
\ No newline at end of file
projects / speedfreak / blobdiff