From 491d3956a4f1bc6ce5501bcc0449007a16514288 Mon Sep 17 00:00:00 2001
From: xue <>
Date: Wed, 29 Aug 2007 03:03:30 +0000
Subject: implemented CAPTCHA image generation.

---
 framework/Web/UI/WebControls/assets/captcha.php | 60 ++++++++++++++++++++++---
 1 file changed, 54 insertions(+), 6 deletions(-)

(limited to 'framework/Web/UI/WebControls/assets/captcha.php')

diff --git a/framework/Web/UI/WebControls/assets/captcha.php b/framework/Web/UI/WebControls/assets/captcha.php
index aa3fdcc0..a722772b 100644
--- a/framework/Web/UI/WebControls/assets/captcha.php
+++ b/framework/Web/UI/WebControls/assets/captcha.php
@@ -1,11 +1,17 @@
 <?php
 
-require_once(dirname(__FILE__).'/captcha_key.php');
-
-if(isset($_GET['pk']))
-	echo $_GET['pk'].$privateKey;
+if(isset($_GET['pk']) && strlen($_GET['pk'])>=6 && isset($_GET['length']) && (int)$_GET['length']>=4 && isset($_GET['case']))
+{
+	require_once(dirname(__FILE__).'/captcha_key.php');
+	$publicKey=$_GET['pk'];
+	$tokenLength=(int)$_GET['length'];
+	$caseSensitive=!empty($_GET['case']);
+	$token=generateToken($publicKey,$privateKey,$tokenLength,$caseSensitive);
+}
 else
-	echo $privateKey;
+	$token='error';
+
+displayToken($token);
 
 function generateToken($publicKey,$privateKey,$tokenLength,$caseSensitive)
 {
@@ -16,7 +22,7 @@ function generateToken($publicKey,$privateKey,$tokenLength,$caseSensitive)
 function hash2string($hex,$alphabet='')
 {
 	if(strlen($alphabet)<2)
-		$alphabet='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+		$alphabet='234578adefhijmnrtABDEFGHJLMNQRT';
 	$hexLength=strlen($hex);
 	$base=strlen($alphabet);
 	$result='';
@@ -32,4 +38,46 @@ function hash2string($hex,$alphabet='')
 	return $result;
 }
 
+function displayToken($token)
+{
+	$length=strlen($token);
+	$width=45*$length;
+	$height=70;
+	$image=imagecreatetruecolor($width,$height);
+	$font=dirname(__FILE__).DIRECTORY_SEPARATOR.'verase.ttf';
+	$vred=rand(0,100);
+	$vgreen=rand(0,100);
+	$vblue=rand(0,100);
+	for($x=0;$x<$width;++$x)
+	{
+		for($y=0;$y<$height;++$y)
+		{
+			$vred+=rand(-2,2);
+			$vgreen+=rand(-2,2);
+			$vblue+=rand(-2,2);
+			if($vred<0) $vred=0; if($vred>150) $vred=75;
+			if($vgreen<0) $vgreen=0; if($vgreen>150) $vgreen=75;
+			if($vblue<0) $vblue=0; if($vblue>150) $vblue=75;
+			$col = imagecolorallocate($image, $vred, $vgreen, $vblue);
+			imagesetpixel($image, $x, $y, $col);
+            imagecolordeallocate($image, $col);
+		}
+	}
+
+    imagefilter($image,IMG_FILTER_GAUSSIAN_BLUR);
+    for($i=0;$i<$length;$i++)
+	{
+        $vred = rand(150, 240);
+		$vgreen = rand(150, 240);
+		$vblue = rand(150, 240);
+        $col = imagecolorallocate($image, $vred, $vgreen, $vblue);
+        $char = $token[$i];
+        imagettftext($image, rand(40, 50), rand(-10, 20), 13 + (40 * $i), rand(50, imagesy($image) - 10), $col, $font, $char);
+        imagecolordeallocate($image, $col);
+    }
+    imagefilter($image,IMG_FILTER_GAUSSIAN_BLUR);
+	imagepng($image);
+	imagedestroy($image);
+}
+
 ?>
\ No newline at end of file
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