* Modified by Benjamin Drieu - 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'] = ""; $el['CAPTCHA_LABEL'] = ''._("Type word above:").' '; } 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); } } } // Local Variables: // mode: php // tab-width: 8 // c-basic-offset: 4 // c-hanging-comment-ender-p: nil // indent-tabs-mode: nil // End: ?>