Hazır captcha uygulaması..

Hazır captcha uygulaması.. 12/04/2008 13:50:23

DarkProfits

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Active Coder (Moderatör)

js ile uygulanmış bir captcha uygulaması kullanımı çok kolay ve sorunsuz..

öncelikle form bileşenimizin sonuna:

CODE:

name="capform" onSubmit="return capCheck(this);"

kodumuzu ekliyoruz..

sora güvenlik kodumuzu oluşturuyoruz..

CODE:

<a href="http://www.adres.com/" target="_out"><img src="captcha/image.php" name="capimage" border="0"></a><BR /><BR />

	Enter text from image above into the box below:<BR />

	<input type="text" value="" name="captext" /></textarea>

işte buda js kodumuz bunun sayesinde php ile sorgudn kurtuluyoruz..bunu istediğimiz yere koyuyoruz.

CODE:

<script id="clientEventHandlersJS" language="javascript">

	<!--

	function capCheck(theForm) {

		var xmlhttp;

		var sReply;

		DataToSend = "action=process&captext=" + escape(theForm.captext.value);

		if (window.XMLHttpRequest) {

			xmlhttp=new XMLHttpRequest();

			xmlhttp.open("POST",'captcha/process.php',false);

			xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

			xmlhttp.send(DataToSend);

			sReply = xmlhttp.responseText;

		} else if (window.ActiveXObject) {

			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

			xmlhttp.open("POST",'captcha/process.php',false);

			xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

			xmlhttp.send(DataToSend);

			sReply = xmlhttp.responseText;

		}

		if (sReply == "good") {

			alert("Kod doğru"); return true;

		} else if (sReply == "bad") {

			alert("Kod yanlış"); return false;

		} else if (sReply == "") {

			alert("Giriş yapılmadı"); return false;

		} else {

			alert("Hata"); return false;

		}

	}

	-->

	</script>

image.php içeriği:
CODE:

<?

session_start();



//Set these avriables as you see fit

$fontsize = 12;

$numcharacters = 8;

$bgcolor = "ffffff";

$textcolor = "000000";

$num_interference_lines = 0;



//At least one of these MUST be true

$str_includes_numbers = true;

$str_includes_uppercase = true;

$str_includes_lowercase = true;



//Generate Captcha String

$_SESSION['teassocaptcha'] = RandString($numcharacters, $str_includes_numbers, $str_includes_uppercase, $str_includes_lowercase);



//Send a generated image to the browser

create_image($numcharacters, $fontsize, $bgcolor, $textcolor, $num_interference_lines);

exit();



function create_image($length, $fontsize, $bgcolor, $textcolor, $numlines)

{



    //Set the image width and height

	$trifont = 2* $fontsize;

    $width = ($trifont * $length);

    $height = 4.2* $fontsize;



    //Create the image resource 

    $image = imagecreate($width, $height);  



    //We are making colors

    $forecolor = imagecolorallocate($image, hexdec(substr($textcolor,0,2)), hexdec(substr($textcolor,2,2)), hexdec(substr($textcolor,4,2)));

    $backcolor = imagecolorallocate($image, hexdec(substr($bgcolor,0,2)), hexdec(substr($bgcolor,2,2)), hexdec(substr($bgcolor,4,2)));



    //Make the background backcolor 

    imagefill($image, 0, 0, $backcolor); 



    //Add randomly generated string in forecolor to the image

    //imagestring($image, 7, 30, 3, $pass, $forecolor); 



    //Tell the browser what kind of file is come in 

    header("Content-Type: image/jpeg");

	

	//imageloadfont("chick.ttf");

	

	for($i = 0; $i < $length; $i++) {

		$source = imagecreate($trifont, $trifont);



		//We are making colors

		$forecolors = imagecolorallocate($source, hexdec(substr($textcolor,0,2)), hexdec(substr($textcolor,2,2)), hexdec(substr($textcolor,4,2)));

		$backcolors = imagecolorallocate($source, hexdec(substr($bgcolor,0,2)), hexdec(substr($bgcolor,2,2)), hexdec(substr($bgcolor,4,2)));



		imagefill($source, 0, 0, $backcolors); 

		

		//imagestring($source, 5, 3, 0, substr($_SESSION['teassocaptcha'], $i, 1), $forecolors); 

		

		

		imagettftext($source, $fontsize, 0, 0, 18, $forecolors, "verdana.ttf", substr($_SESSION['teassocaptcha'], $i, 1));



        //Rotate Somehow

		switch(mt_rand(1,8)) {

            case 1:

				$source = imagerotate($source, -20, $backcolors);

                break;

            case 2:

				$source = imagerotate($source, 20, $backcolors);

                break;

            case 3:

				$source = imagerotate($source, -15, $backcolors);

                break;

            case 4:

				$source = imagerotate($source, 15, $backcolors);

                break;

            case 5:

				$source = imagerotate($source, -10, $backcolors);

                break;

            case 6:

				$source = imagerotate($source, 10, $backcolors);

                break;

            case 7:

				$source = imagerotate($source, -2, $backcolors);

                break;

            case 8:

				$source = imagerotate($source, 2, $backcolors);

                break;

		}

        //Set Location variables

		$loc_x = 5+($trifont*$i);

		$loc_y = $trifont/2 + mt_rand((-1 * $fontsize/10),($fontsize/10));

		//Set Size Variables

		$size_x = $trifont * (mt_rand(100, 110) / 100);

		$size_y = $trifont * (mt_rand(100, 110) / 100);

		

		imagecopymerge($image,$source,$loc_x,$loc_y,0,0,$size_x,$size_y,90);



		imagedestroy($source);

	}

	

    /*Throw in some lines to make it a little bit harder for any bots to break */

	imagesetstyle($image, array($forecolor, $forecolor, $forecolor, $forecolor, $forecolor, $forecolor, $forecolor, $forecolor, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT));

    imagerectangle($image,0,0,$width-1,$height-1,$forecolor);

	//for($i = 1; $i < mt_rand(1,5); $i++) {

	for($i = 1; $i < (1 + $numlines); $i++) {

		$from_x = mt_rand(0, $width);

		$from_y = mt_rand(0, $height);

		$to_x = mt_rand(0, $width);

		$to_y = mt_rand(0, $height);

		imageline($image, $from_x, $from_y, $to_x, $to_y, IMG_COLOR_STYLED); 

	}

 

    //Output the newly created image in jpeg format 

    imagejpeg($image);

   

    //Free up resources

    imagedestroy($image);

}



function RandString($len, $num, $uc, $lc) {

    if (!$len || $len<1 || $len>100) {

        print "Error: \"Length\" out of range (1-100)<br>n";

        return;

    }

    if (!$num && !$uc && !$lc) {

        print "Error: No character types specified<br>n";

        return;

    }



    $s="";

    $i=0;

    do {

        switch(mt_rand(1,3)) {

            // get number - ASCII characters (0:48 through 9:57)

            case 1:

                if ($num==1) {

                    $s .= chr(mt_rand(48,57));

                    $i++;

                }

                break;



            // get uppercase letter - ASCII characters (a:65 through z:90)

            case 2:

                if ($uc==1) {

                    $s .= chr(mt_rand(65,90));

                    $i++;

                }

                break;



            // get lowercase letter - ASCII characters (A:97 through Z:122)

            case 3:

                if ($lc==1) {

                    $s .= chr(mt_rand(97,122));

                    $i++;

                }

                break;

        }

    } while ($i<$len);



    return $s;

}

?>

process.php içeriği:

CODE:

<?



session_start();



if (strtolower($_POST['captext']) == strtolower($_SESSION['teassocaptcha']))

	echo "good";

else

	echo "bad";

?>

güle güle kullanın..