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<?php
rcs_id('$Id: Captcha.php,v 1.6 2007/01/07 18:42:10 rurban Exp $');
/**
Session Captcha v1.0
by Gavin M. Roy <gmr@bteg.net>
Modified by Benjamin Drieu <bdrieu@april.org> - 2005 for PhpWiki
get_captcha_random_word() contributed by Dan Frankowski 2005 for PhpWiki
objectified and randomized 2005 by Reini Urban
This File is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This File is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with This File; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
class Captcha {
function Captcha($meta = array(), $width = 250, $height = 80) {
$this->meta =& $meta;
$this->width = $width;
$this->height = $height;
$this->length = 8;
$this->failed_msg = _("Typed in verification word mismatch ... are you a bot?");
$this->request =& $GLOBALS['request'];
}
function captchaword() {
if ( ! $this->request->getSessionVar('captchaword')) {
$this->request->setSessionVar('captchaword', $this->get_word());
}
return $this->request->getSessionVar('captchaword');
}
function Failed () {
if ($this->request->getSessionVar('captcha_ok') == true)
return false;
if ( ! array_key_exists ( 'captcha_input', $this->meta )
or ($this->request->getSessionVar('captchaword')
and ($this->request->getSessionVar('captchaword') != $this->meta['captcha_input'])))
return true;
$this->request->setSessionVar('captcha_ok', true);
return false;
}
function getFormElements() {
$el = array();
if (! $this->request->getSessionVar('captcha_ok')) {
$el['CAPTCHA_INPUT']
= HTML::input(array('type' => 'text',
'class' => 'wikitext',
'id' => 'edit-captcha_input',
'name' => 'edit[captcha_input]',
'size' => $this->length + 2,
'maxlength' => 256));
$url = WikiURL("", array("action"=>"captcha","id"=>time()), false);
$el['CAPTCHA_IMAGE'] = "<img src=\"$url\" alt=\"captcha\" />";
$el['CAPTCHA_LABEL'] = '<label for="edit-captcha_input">'._("Type word above:").' </label>';
}
return $el;
}
function get_word () {
if (USE_CAPTCHA_RANDOM_WORD)
return get_dictionary_word();
else
return rand_ascii_readable($this->length); // lib/stdlib.php
}
function get_dictionary_word () {
// Load In the Word List
$fp = fopen(findfile("lib/captcha/dictionary"), "r");
while ( !feof($fp) )
$text[] = trim(fgets($fp, 1024));
fclose($fp);
// Pick a Word
$word = "";
better_srand();
while ( strlen(trim($word)) == 0 ) {
if (function_exists('mt_rand'))
$x = mt_rand(0, count($text));
else
$x = rand(0, count($text));
return $text[$x];
}
}
// Draw the Spiral
function spiral( &$im, $origin_x = 100, $origin_y = 100, $r = 0, $g = 0, $b = 0 ) {
$theta = 1;
$thetac = 6;
$radius = 15;
$circles = 10;
$points = 35;
$lcolor = imagecolorallocate( $im, $r, $g, $b );
for( $i = 0; $i < ( $circles * $points ) - 1; $i++ ) {
$theta = $theta + $thetac;
$rad = $radius * ( $i / $points );
$x = ( $rad * cos( $theta ) ) + $origin_x;
$y = ( $rad * sin( $theta ) ) + $origin_y;
$theta = $theta + $thetac;
$rad1 = $radius * ( ( $i + 1 ) / $points );
$x1 = ( $rad1 * cos( $theta ) ) + $origin_x;
$y1 = ( $rad1 * sin( $theta ) ) + $origin_y;
imageline( $im, $x, $y, $x1, $y1, $lcolor );
$theta = $theta - $thetac;
}
}
function image ( $word ) {
$width =& $this->width;
$height =& $this->height;
// Create the Image
$jpg = ImageCreate($width,$height);
$bg = ImageColorAllocate($jpg,255,255,255);
$tx = ImageColorAllocate($jpg,185,140,140);
ImageFilledRectangle($jpg,0,0,$width,$height,$bg);
$x = rand(0, $width);
$y = rand(0, $height);
$this->spiral($jpg, $x, $y, $width-25, 190, 190);
$x = rand(10, 30);
$y = rand(50, $height-20); //50-60
// randomize the chars
for ($i=0; $i < strlen($word); $i++) {
$angle += rand(-5, 5);
if ( $angle > 25 ) $angle = 15;
elseif ( $angle < -25 ) $angle = -15;
$size = rand(14, 20);
$y += rand(-10, 10);
if ( $y < 10 ) $y = 11;
elseif ( $y > $height-10 ) $y = $height-11;
$x += rand($size, $size*2);
imagettftext($jpg, $size, $angle, $x, $y, $tx,
realpath(findfile("lib/captcha/Vera.ttf")),
$word[$i]);
}
$x = rand(0, $width+30);
$y = rand(0, $height+35); // 115
$this->spiral($jpg, $x, $y, 255,190,190);
imageline($jpg, 0,0,$width-1,0,$tx);
imageline($jpg, 0,0,0,$height-1,$tx);
imageline($jpg, 0,$height-1,$width-1,$height-1,$tx);
imageline($jpg, $width-1,0,$width-1,$height-1,$tx);
if (function_exists("ImageJpeg")) {
header("Content-type: image/jpeg");
ImageJpeg($jpg);
} elseif (function_exists("ImagePNG")) {
header("Content-type: image/png");
ImagePNG($jpg);
} elseif (function_exists("ImageGIF")) {
header("Content-type: image/gif");
ImageGIF($jpg);
} else {
trigger_error("missing GD bitmap support", E_USER_WARNING);
}
}
}
// $Log: Captcha.php,v $
// Revision 1.6 2007/01/07 18:42:10 rurban
// Improve id: edit: to edit-
//
// Revision 1.5 2005/10/31 16:44:13 rurban
// fallback to PNG or GIF if JPEG support does not exist
//
// Revision 1.4 2005/10/30 14:20:42 rurban
// move Captcha specific vars and methods into a Captcha object
// randomize Captcha chars positions and angles (smoothly)
//
// Revision 1.3 2005/10/29 07:37:56 rurban
// USE_CAPTCHA_RANDOM_WORD by Dan Frankowski
//
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>
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