'; ctl_captcha_generate_code(); echo ' '; return true; } /* Function to include captcha for comments form > wp3 */ function include_ctl_captcha_comment_form_wp3() { $c_registered = get_option('wpcaptcha_registered'); if ( is_user_logged_in() && $c_registered == 'yes') { return true; } echo '
'; ctl_captcha_generate_code(); echo ' '; remove_action( 'comment_form', 'include_ctl_captcha_comment_form' ); return true; } // this function checks captcha posted with the comment function include_ctl_captcha_comment_post($comment) { $c_registered = get_option('wpcaptcha_registered'); if (is_user_logged_in() && $c_registered == 'yes') { return $comment; } // skip captcha for comment replies from the admin menu if ( isset( $_REQUEST['action'] ) && $_REQUEST['action'] == 'replyto-comment' && ( check_ajax_referer( 'replyto-comment', '_ajax_nonce', false ) || check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment', false ) ) ) { // skip capthca return $comment; } // Skip captcha for trackback or pingback if ( $comment['comment_type'] != '' && $comment['comment_type'] != 'comment' ) { // skip captcha return $comment; } // If captcha is empty if(empty($_REQUEST['captcha_code'])) wp_die( __('CAPTCHA cannot be empty.', 'captcha-code-authentication' ) ); // captcha was matched if($_SESSION['captcha_code'] == $_REQUEST['captcha_code']) return($comment); else wp_die( __('Error: Incorrect CAPTCHA. Press your browser\'s back button and try again.', 'captcha-code-authentication')); } /* */ // Add captcha in the register form $register_captcha = get_option('wpcaptcha_register'); if($register_captcha == 'yes') { add_action('register_form', 'include_ctl_wp_captcha_register'); add_action( 'register_post', 'include_ctl_captcha_register_post', 10, 3 ); add_action( 'signup_extra_fields', 'include_ctl_wp_captcha_register' ); add_filter( 'wpmu_validate_user_signup', 'include_ctl_captcha_register_validate' ); } /* Function to include captcha for register form */ function include_ctl_wp_captcha_register($default) { echo '
'; ctl_captcha_generate_code(); echo ' '; return true; } /* This function checks captcha posted with registration */ function include_ctl_captcha_register_post($login,$email,$errors) { // If captcha is blank - add error if ( isset( $_REQUEST['captcha_code'] ) && "" == $_REQUEST['captcha_code'] ) { $errors->add('captcha_blank', ''.__('ERROR', 'captcha-code-authentication').': '.__('Please complete the CAPTCHA.', 'captcha-code-authentication')); return $errors; } if ( isset( $_REQUEST['captcha_code'] ) && ($_SESSION['captcha_code'] == $_REQUEST['captcha_code'] )) { // captcha was matched } else { $errors->add('captcha_wrong', ''.__('ERROR', 'captcha-code-authentication').': '.__('That CAPTCHA was incorrect.', 'captcha-code-authentication')); } return($errors); } /* End of the function include_ctl_captcha_register_post */ function include_ctl_captcha_register_validate($results) { if ( isset( $_REQUEST['captcha_code'] ) && "" == $_REQUEST['captcha_code'] ) { $results['errors']->add('captcha_blank', ''.__('ERROR', 'captcha-code-authentication').': '.__('Please complete the CAPTCHA.', 'captcha-code-authentication')); return $results; } if ( isset( $_REQUEST['captcha_code'] ) && ($_SESSION['captcha_code'] == $_REQUEST['captcha_code'] )) { // captcha was matched } else { $results['errors']->add('captcha_wrong', ''.__('ERROR', 'captcha-code-authentication').': '.__('That CAPTCHA was incorrect.', 'captcha-code-authentication')); } return($results); } /* End of the function include_ctl_captcha_register_validate */ $lost_captcha = get_option('wpcaptcha_lost'); // Add captcha into lost password form if($lost_captcha == 'yes'){ add_action( 'lostpassword_form', 'include_ctl_captcha_lostpassword' ); add_action( 'lostpassword_post', 'include_ctl_captcha_lostpassword_post', 10, 3 ); } /* Function to include captcha for lost password form */ function include_ctl_captcha_lostpassword($default) { echo '
'; ctl_captcha_generate_code(); echo ' '; } function include_wp_captcha_lostpassword_post() { if( isset( $_REQUEST['user_login'] ) && "" == $_REQUEST['user_login'] ) return; // If captcha doesn't entered if ( isset( $_REQUEST['captcha_code'] ) && "" == $_REQUEST['captcha_code'] ) { wp_die( __( 'Please complete the CAPTCHA.', 'captcha-code-authentication' ) ); } // Check entered captcha if ( isset( $_REQUEST['captcha_code'] ) && ($_SESSION['captcha_code'] == $_REQUEST['captcha_code'] )) { return; } else { wp_die( __( 'Error: Incorrect CAPTCHA. Press your browser\'s back button and try again.', 'captcha-code-authentication' ) ); } } function ctl_captcha_generate_code() { //Settings: You can customize the captcha here $image_width = 120; $image_height = 40; $characters_on_image = get_option('wpcaptcha_total_no_of_characters'); if($characters_on_image < 3 || $characters_on_image > 6) $characters_on_image = 6; $wpcaptcha_type = get_option('wpcaptcha_type'); $wpcaptcha_letters = get_option('wpcaptcha_letters'); $font = dirname(__FILE__) . '/monofont.ttf'; //The characters that can be used in the CAPTCHA code. //avoid confusing characters (l 1 and i for example) if(!empty($wpcaptcha_type) && $wpcaptcha_type == 'alphanumeric') { switch($wpcaptcha_letters) { case 'capital': $possible_letters = '23456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; break; case 'small': $possible_letters = '23456789bcdfghjkmnpqrstvwxyz'; break; case 'capitalsmall': $possible_letters = '23456789bcdfghjkmnpqrstvwxyzABCEFGHJKMNPRSTVWXYZ'; break; default: $possible_letters = '23456789bcdfghjkmnpqrstvwxyz'; break; } } elseif(!empty($wpcaptcha_type) && $wpcaptcha_type == 'alphabets') { switch($wpcaptcha_letters) { case 'capital': $possible_letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; break; case 'small': $possible_letters = 'bcdfghjkmnpqrstvwxyz'; break; case 'capitalsmall': $possible_letters = 'bcdfghjkmnpqrstvwxyzABCEFGHJKMNPRSTVWXYZ'; break; default: $possible_letters = 'abcdefghijklmnopqrstuvwxyz'; break; } } elseif(!empty($wpcaptcha_type) && $wpcaptcha_type == 'numbers') { $possible_letters = '0123456789'; } else { $possible_letters = '0123456789'; } $random_dots = 0; $random_lines = 20; $captcha_text_color="0x142864"; $captcha_noice_color = "0x142864"; $code = ''; $i = 0; while ($i < $characters_on_image) { $code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1); $i++; } $font_size = $image_height * 0.75; $image = @imagecreate($image_width, $image_height); /* setting the background, text and noise colours here */ $background_color = imagecolorallocate($image, 255, 255, 255); $arr_text_color = ctl_captcha_hexrgb($captcha_text_color); $text_color = imagecolorallocate($image, $arr_text_color['red'], $arr_text_color['green'], $arr_text_color['blue']); $arr_noice_color = ctl_captcha_hexrgb($captcha_noice_color); $image_noise_color = imagecolorallocate($image, $arr_noice_color['red'], $arr_noice_color['green'], $arr_noice_color['blue']); /* generating the dots randomly in background */ for( $i=0; $i<$random_dots; $i++ ) { imagefilledellipse($image, mt_rand(0,$image_width), mt_rand(0,$image_height), 2, 3, $image_noise_color); } /* generating lines randomly in background of image */ for( $i=0; $i<$random_lines; $i++ ) { imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height), mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color); } /* create a text box and add 6 letters code in it */ $textbox = imagettfbbox($font_size, 0, $font, $code); $x = ($image_width - $textbox[4])/2; $y = ($image_height - $textbox[5])/2; imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code); ob_start(); imagejpeg($image);//showing the image printf('
', base64_encode(ob_get_clean()));
imagedestroy($image);//destroying the image instance
$_SESSION['captcha_code'] = $code;
}
function ctl_captcha_hexrgb ($hexstr)
{
$int = hexdec($hexstr);
return array("red" => 0xFF & ($int >> 0x10),
"green" => 0xFF & ($int >> 0x8),
"blue" => 0xFF & $int);
}
?>