1 files changed, 103 insertions, 0 deletions
diff --git a/Library/Image/Gd/Captcha.php b/Library/Image/Gd/Captcha.php
new file mode 100644
index 0000000..1e8d706
--- /dev/null
+++ b/Library/Image/Gd/Captcha.php
@@ -0,0 +1,103 @@
+<?php
+
+// EasyGiant is a PHP framework for creating and managing dynamic content
+//
+// Copyright (C) 2009 - 2011  Antonio Gallo
+// See COPYRIGHT.txt and LICENSE.txt.
+//
+// This file is part of EasyGiant
+//
+// EasyGiant is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// EasyGiant 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.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with EasyGiant.  If not, see <http://www.gnu.org/licenses/>.
+
+if (!defined('EG')) die('Direct access not allowed!');
+
+//class to create a captcha
+//you have to call session_start() before to initialize a captcha object
+class Image_Gd_Captcha
+{
+
+	private $params = array(); //parameters of the object
+	private $string = null; //the text string of the captcha
+	
+	public function __construct($params = null)
+	{
+		$here = realpath('.');
+		
+		$defaultParams = array(
+			'boxWidth'		=>	150,
+			'boxHeight'		=>	100,
+			'charNumber'	=>	6,
+			'fontPath'		=>	$here.'/External/Fonts/FreeFont/FreeMono.ttf',
+			'undulation'	=>	true,
+			'align'			=>	false,
+			'charHeight'	=>	28,
+			'sessionKey'	=>	'captchaString',
+		);
+
+		//set the $this->scaffold->params array
+		if (is_array($params))
+		{
+			foreach ($params as $key => $value)
+			{
+				$defaultParams[$key] = $value;
+			}
+		}
+		$this->params = $defaultParams;
+		
+		$this->string = generateString($this->params['charNumber']);
+	}
+
+	public function render()
+	{
+		//space among characters
+		$space = $this->params['boxWidth'] / ($this->params['charNumber']+1);
+		//create the image box
+		$img = imagecreatetruecolor($this->params['boxWidth'],$this->params['boxHeight']);
+		
+		$background = imagecolorallocate($img,255,255,255);
+		$border = imagecolorallocate($img,0,0,0);
+		$colors[] = imagecolorallocate($img,mt_rand(0,125),mt_rand(0,125),mt_rand(0,125));
+		$colors[] = imagecolorallocate($img,mt_rand(0,125),mt_rand(0,125),mt_rand(0,125));
+		$colors[] = imagecolorallocate($img,mt_rand(0,125),mt_rand(0,125),mt_rand(0,125));
+		
+		//create the background
+		imagefilledrectangle($img,1,1,$this->params['boxWidth']-2,$this->params['boxHeight']-2,$background);
+		imagerectangle($img,0,0,$this->params['boxWidth']-1,$this->params['boxHeight']-2,$border);
+		
+		//set the text
+		for ($i=0; $i< $this->params['charNumber']; $i++)
+		{
+			$color = $colors[$i % count($colors)];
+			$char = substr($this->string,$i,1);
+			$fontPath = $this->params['fontPath'];
+			$angle = $this->params['undulation'] === false ? 0 : -20+rand(0,40);
+			$yposFixed = (int)(($this->params['boxHeight'])/2);
+			$ypos = $this->params['align'] === true ? $yposFixed : $yposFixed + mt_rand(0,10);
+			$charHeight = $this->params['charHeight'];
+			imagettftext($img,$charHeight + rand(0,8),$angle,($i+0.3)*$space,$ypos,$color,$fontPath,$char);
+		}
+
+		$noiseColor = imagecolorallocate($img, mt_rand(125,255), mt_rand(125,255), mt_rand(125,255));
+		/* generate random dots in background */
+		for( $i=0; $i<($this->params['boxWidth'] * $this->params['boxHeight'])/7; $i++ ) {
+			imagefilledellipse($img, mt_rand(0,$this->params['boxWidth']), mt_rand(0,$this->params['boxHeight']), 1, 1, $noiseColor);
+		}
+		
+		$_SESSION[$this->params['sessionKey']] = $this->string;
+		header('Content-Type: image/png');
+		imagepng($img);
+		imagedestroy($img);
+	}
+	
+}
+\ No newline at end of file