diff options
Diffstat (limited to 'system/helpers/captcha_helper.php')
| -rw-r--r-- | system/helpers/captcha_helper.php | 78 |
1 files changed, 53 insertions, 25 deletions
diff --git a/system/helpers/captcha_helper.php b/system/helpers/captcha_helper.php index 5252d417c..dcd6882c8 100644 --- a/system/helpers/captcha_helper.php +++ b/system/helpers/captcha_helper.php @@ -68,10 +68,11 @@ if ( ! function_exists('create_captcha')) 'img_url' => '', 'img_width' => '150', 'img_height' => '30', + 'img_alt' => 'captcha', 'font_path' => '', + 'font_size' => 16, 'expiration' => 7200, 'word_length' => 8, - 'font_size' => 16, 'img_id' => '', 'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 'colors' => array( @@ -82,6 +83,8 @@ if ( ! function_exists('create_captcha')) ) ); + $now = microtime(TRUE); + foreach ($defaults as $key => $val) { if ( ! is_array($data) && empty($$key)) @@ -112,23 +115,41 @@ if ( ! function_exists('create_captcha')) return FALSE; } - // ----------------------------------- - // Remove old images - // ----------------------------------- + if ($img_url !== '' OR $img_path !== '') + { + if ($img_path === '' OR $img_url === '') + { + log_message('error', 'create_captcha(): $img_path and $img_url are required.'); + return FALSE; + } - $now = microtime(TRUE); + if ( ! is_dir($img_path) OR ! is_really_writable($img_path)) + { + log_message('error', "create_captcha(): '{$img_path}' is not a dir, nor is it writable."); + return FALSE; + } - $current_dir = @opendir($img_path); - while ($filename = @readdir($current_dir)) - { - if (in_array(substr($filename, -4), array('.jpg', '.png')) - && (str_replace(array('.jpg', '.png'), '', $filename) + $expiration) < $now) + /** + * Remove old images + */ + $current_dir = @opendir($img_path); + while ($filename = @readdir($current_dir)) { - @unlink($img_path.$filename); + if (preg_match('#^(?<ts>\d{10})\.png$#', $filename, $match) && ($match['ts'] + $expiration) < $now) + { + @unlink($img_path.$filename); + } } - } - @closedir($current_dir); + @closedir($current_dir); + + // This variable will later be used later to determine whether we write to disk or output a data:image URI + $img_filename = $now.'.png'; + } + else + { + $img_filename = NULL; + } // ----------------------------------- // Do we have a "word" yet? @@ -238,8 +259,8 @@ if ( ! function_exists('create_captcha')) // Determine angle and position // ----------------------------------- $length = strlen($word); - $angle = ($length >= 6) ? mt_rand(-($length-6), ($length-6)) : 0; - $x_axis = mt_rand(6, (360/$length)-16); + $angle = ($length >= 6) ? mt_rand(-($length - 6), ($length - 6)) : 0; + $x_axis = mt_rand(6, (360 / $length)-16); $y_axis = ($angle >= 0) ? mt_rand($img_height, $img_width) : mt_rand(6, $img_height); // Create image @@ -327,24 +348,31 @@ if ( ! function_exists('create_captcha')) // ----------------------------------- // Generate the image // ----------------------------------- - $img_url = rtrim($img_url, '/').'/'; - if (function_exists('imagejpeg')) + if (isset($img_filename)) { - $img_filename = $now.'.jpg'; - imagejpeg($im, $img_path.$img_filename); - } - elseif (function_exists('imagepng')) - { - $img_filename = $now.'.png'; + $img_src = rtrim($img_url, '/').'/'.$img_filename; imagepng($im, $img_path.$img_filename); } else { - return FALSE; + // I don't see an easier way to get the image contents without writing to file + $buffer = fopen('php://memory', 'wb+'); + imagepng($im, $buffer); + rewind($buffer); + $img_src = ''; + + // fread() will return an empty string (not FALSE) after the entire contents are read + while (strlen($read = fread($buffer, 4096))) + { + $img_src .= $read; + } + + fclose($buffer); + $img_src = 'data:image/png;base64,'.base64_encode($img_src); } - $img = '<img '.($img_id === '' ? '' : 'id="'.$img_id.'"').' src="'.$img_url.$img_filename.'" style="width: '.$img_width.'px; height: '.$img_height .'px; border: 0;" alt=" " />'; + $img = '<img '.($img_id === '' ? '' : 'id="'.$img_id.'"').' src="'.$img_src.'" style="width: '.$img_width.'px; height: '.$img_height .'px; border: 0;" alt="'.$img_alt.'" />'; ImageDestroy($im); return array('word' => $word, 'time' => $now, 'image' => $img, 'filename' => $img_filename); |