X-Git-Url: http://git.dj3c1t.com/?a=blobdiff_plain;f=mw%2Flibs%2Fptitcaptcha.php;fp=mw%2Flibs%2Fptitcaptcha.php;h=0262931d3f6b682be35b606f18750ea62053d5f1;hb=36ed114046cbe3d72a3589230e9f306a54fcc79d;hp=0000000000000000000000000000000000000000;hpb=281c96e95451269f2614684b8de5be25862c8374;p=mtweb

diff --git a/mw/libs/ptitcaptcha.php b/mw/libs/ptitcaptcha.php
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+<?php
+
+/**
+ * Ptitcaptcha : simple php captcha system
+ * 
+ * @author Jean-Pierre Morfin
+ * @license Creative Commons By
+ * @license http://creativecommons.org/licenses/by/2.0/fr/
+ */
+ 
+/* Change it to have a specific encoding ! */
+define("PTITCAPTCHA_ENTROPY","sourceml ptitcaptcha entropy");
+ 
+/* Choose length (max 32) */
+define("PTITCAPTCHA_LENGTH",5);
+ 
+$GLOBALS["ptitcaptcha_akey"] = md5(uniqid(rand(), true));
+ 
+/**
+ * Helper to generate html form tags
+ *
+ */
+class PtitCaptchaHelper
+{
+	/**
+	 * Generate IMG Tag
+	 *
+	 * @param string $baseuri : relative or absolute path to folder containing this file on web
+	 * @return IMG Tag
+	 */
+	static function generateImgTags($baseuri)
+	{
+		return "<a class=\"ptitcaptcha\" href=\"#\"><img alt=\"???\" title=\"?\"".
+			" src=\"".$baseuri."ptitcaptcha.php?pck=".$GLOBALS['ptitcaptcha_akey']."\"".
+			" id=\"ptitcaptcha\"".
+			" onclick=\"javascript:this.src='".$baseuri."ptitcaptcha.php?pck=".
+			$GLOBALS['ptitcaptcha_akey'].
+			"&amp;z='+Math.random();return false;\" /></a>\n";
+	}
+ 
+	/**
+	 * Generate hidden tag (must be in a form)
+	 *
+	 * @return input hidden tag
+	 */
+	static function generateHiddenTags()
+	{
+		return "<input type=\"hidden\" name=\"ptitcaptcha_key\" value=\"".$GLOBALS['ptitcaptcha_akey']."\"/>";
+	}
+ 
+	/**
+	 * Generate input tag (must be in a form)
+	 *
+	 * @return input tag
+	 */
+	static function generateInputTags()
+	{
+		return "<input type=\"text\" name=\"ptitcaptcha_entry\" id=\"ptitcaptcha_entry\" value=\"\"/>";
+	}
+ 
+	/**
+	 * Check if user input is correct
+	 *
+	 * @return boolean (true=correct, false=incorrect)
+	 */
+	static function checkCaptcha()
+	{
+		if(	isset($_POST['ptitcaptcha_entry']) && 
+			$_POST['ptitcaptcha_entry'] == PtitCaptchaHelper::_getDisplayText($_POST['ptitcaptcha_key']))
+		{
+			return true;
+		}
+		return false;
+	}
+ 
+	/**
+	 * Internal function
+	 *
+	 * @param string $pck
+	 * @return string
+	 */
+	static function _getDisplayText($pck)	// internal function
+	{
+		$src=md5(PTITCAPTCHA_ENTROPY.$pck);
+		$txt="";
+		for($i=0;$i<PTITCAPTCHA_LENGTH;$i++)
+			$txt.=substr($src,$i*32/PTITCAPTCHA_LENGTH,1);
+		return $txt;
+	}
+}	
+ 
+ 
+// If script called directly : generate image
+if(basename($_SERVER["SCRIPT_NAME"])=="ptitcaptcha.php" && isset($_GET["pck"]))
+{
+	$width = PTITCAPTCHA_LENGTH*10+10;
+	$height = 30;
+ 
+	$image = imagecreatetruecolor($width, $height);
+	$bgCol = imagecolorallocate($image, rand(128,255), rand(128,255), rand(128,255));
+	imagefilledrectangle($image,0,0,$width,$height,$bgCol);
+ 
+	$txt = PtitCaptchaHelper::_getDisplayText($_GET["pck"]);
+ 
+	for($c=0;$c<PTITCAPTCHA_LENGTH*2;$c++)
+	{
+		$bgCol = imagecolorallocate($image, rand(100,255), rand(100,255), rand(100,255));
+		$x=rand(0,$width);
+		$y=rand(0,$height);
+		$w=rand(5,$width/2);
+		$h=rand(5,$height/2);
+		imagefilledrectangle($image,$x,$y,$x+$w,$y+$h,$bgCol);
+		imagecolordeallocate($image,$bgCol);
+	}
+	for($c=0;$c<PTITCAPTCHA_LENGTH;$c++)
+	{
+		$txtCol = imagecolorallocate($image, rand(0,128) , rand(0,128), rand(0,128));
+		imagestring($image,5,5+10*$c,rand(0,10),substr($txt,$c,1),$txtCol);
+		imagecolordeallocate($image,$txtCol);
+	}
+ 
+	header("Content-type: image/png");
+	imagepng($image);
+	imagedestroy($image);
+}
+
+?>
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