Initial Kohana install

[speedfreak] / Server / system / libraries / drivers / Captcha / Alpha.php

diff --git a/Server/system/libraries/drivers/Captcha/Alpha.php b/Server/system/libraries/drivers/Captcha/Alpha.php
new file mode 100644 (file)
index 0000000..2779580
--- /dev/null
+++ b/Server/system/libraries/drivers/Captcha/Alpha.php
@@ -0,0 +1,92 @@
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * Captcha driver for "alpha" style.
+ *
+ * $Id: Alpha.php 4367 2009-05-27 21:23:57Z samsoir $
+ *
+ * @package    Captcha
+ * @author     Kohana Team
+ * @copyright  (c) 2007-2008 Kohana Team
+ * @license    http://kohanaphp.com/license.html
+ */
+class Captcha_Alpha_Driver extends Captcha_Driver {
+
+       /**
+        * Generates a new Captcha challenge.
+        *
+        * @return  string  the challenge answer
+        */
+       public function generate_challenge()
+       {
+               // Complexity setting is used as character count
+               return text::random('distinct', max(1, Captcha::$config['complexity']));
+       }
+
+       /**
+        * Outputs the Captcha image.
+        *
+        * @param   boolean  html output
+        * @return  mixed
+        */
+       public function render($html)
+       {
+               // Creates $this->image
+               $this->image_create(Captcha::$config['background']);
+
+               // Add a random gradient
+               if (empty(Captcha::$config['background']))
+               {
+                       $color1 = imagecolorallocate($this->image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
+                       $color2 = imagecolorallocate($this->image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
+                       $this->image_gradient($color1, $color2);
+               }
+
+               // Add a few random circles
+               for ($i = 0, $count = mt_rand(10, Captcha::$config['complexity'] * 3); $i < $count; $i++)
+               {
+                       $color = imagecolorallocatealpha($this->image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255), mt_rand(80, 120));
+                       $size = mt_rand(5, Captcha::$config['height'] / 3);
+                       imagefilledellipse($this->image, mt_rand(0, Captcha::$config['width']), mt_rand(0, Captcha::$config['height']), $size, $size, $color);
+               }
+
+               // Calculate character font-size and spacing
+               $default_size = min(Captcha::$config['width'], Captcha::$config['height'] * 2) / strlen($this->response);
+               $spacing = (int) (Captcha::$config['width'] * 0.9 / strlen($this->response));
+
+               // Background alphabetic character attributes
+               $color_limit = mt_rand(96, 160);
+               $chars = 'ABEFGJKLPQRTVY';
+
+               // Draw each Captcha character with varying attributes
+               for ($i = 0, $strlen = strlen($this->response); $i < $strlen; $i++)
+               {
+                       // Use different fonts if available
+                       $font = Captcha::$config['fontpath'].Captcha::$config['fonts'][array_rand(Captcha::$config['fonts'])];
+
+                       $angle = mt_rand(-40, 20);
+                       // Scale the character size on image height
+                       $size = $default_size / 10 * mt_rand(8, 12);
+                       $box = imageftbbox($size, $angle, $font, $this->response[$i]);
+
+                       // Calculate character starting coordinates
+                       $x = $spacing / 4 + $i * $spacing;
+                       $y = Captcha::$config['height'] / 2 + ($box[2] - $box[5]) / 4;
+
+                       // Draw captcha text character
+                       // Allocate random color, size and rotation attributes to text
+                       $color = imagecolorallocate($this->image, mt_rand(150, 255), mt_rand(200, 255), mt_rand(0, 255));
+
+                       // Write text character to image
+                       imagefttext($this->image, $size, $angle, $x, $y, $color, $font, $this->response[$i]);
+
+                       // Draw "ghost" alphabetic character
+                       $text_color = imagecolorallocatealpha($this->image, mt_rand($color_limit + 8, 255), mt_rand($color_limit + 8, 255), mt_rand($color_limit + 8, 255), mt_rand(70, 120));
+                       $char = $chars[mt_rand(0, 14)];
+                       imagettftext($this->image, $size * 2, mt_rand(-45, 45), ($x - (mt_rand(5, 10))), ($y + (mt_rand(5, 10))), $text_color, $font, $char);
+               }
+
+               // Output
+               return $this->image_render($html);
+       }
+
+} // End Captcha Alpha Driver Class
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