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<?php |
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/* |
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Plugin Name: Captcha Code |
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Description: Adds captcha to front-end forms. |
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Version: 2.8 |
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Author: WebFactory Ltd |
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Author URI: http://www.webfactoryltd.com/ |
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Text Domain: captcha-code-authentication |
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Domain Path: /languages |
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License: GPL2 |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License, version 2, as |
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published by the Free Software Foundation. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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define('WP_CAPTCHA_DIR_URL', plugin_dir_url(__FILE__)); |
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define('WP_CAPTCHA_DIR', dirname(__FILE__)); |
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|
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require 'general_options.php'; |
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|
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/* Hook to initalize the admin menu */ |
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add_action('admin_menu', 'wp_captcha_admin_menu'); |
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/* Hook to initialize sessions */ |
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add_action('init', 'wp_captcha_init_sessions'); |
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|
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/* Hook to store the plugin status */ |
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register_activation_hook(__FILE__, 'wp_captcha_enabled'); |
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register_deactivation_hook(__FILE__, 'wp_captcha_disabled'); |
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|
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function wp_captcha_enabled() |
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{ |
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update_option('wpcaptcha_status', 'enabled'); |
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} |
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function wp_captcha_disabled() |
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{ |
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update_option('wpcaptcha_status', 'disabled'); |
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} |
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|
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/* To add the menus in the admin section */ |
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function wp_captcha_admin_menu() |
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{ |
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add_options_page( |
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__('Captcha Settings'), |
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__('Captcha Settings'), |
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'manage_options', |
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'wp_captcha_slug', |
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'wp_captcha_general_options'); |
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} |
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|
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function wp_captcha_init_sessions() |
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{ |
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if(!session_id()){ |
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session_start(); |
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} |
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load_plugin_textdomain('captcha-code-authentication', false, dirname( plugin_basename(__FILE__)).'/languages'); |
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} |
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|
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/* Captcha for login authentication starts here */ |
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|
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$login_captcha = get_option('wpcaptcha_login'); |
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if($login_captcha == 'yes'){ |
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add_action('login_form', 'include_ctl_captcha_for_login'); |
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add_filter( 'login_errors', 'include_ctl_captcha_login_errors' ); |
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add_filter( 'login_redirect', 'include_ctl_captcha_login_redirect', 10, 3 ); |
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} |
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|
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/* Function to include captcha for login form */ |
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function include_ctl_captcha_for_login() |
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{ |
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echo '<p class="login-form-captcha"> |
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<label><b>'. __('Captcha', 'captcha-code-authentication').' </b> <span class="required">*</span></label> |
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<div style="clear:both;"></div><div style="clear:both;"></div>'; |
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ctl_captcha_generate_code(); |
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|
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/* Will retrieve the get varibale and prints a message from url if the captcha is wrong */ |
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if(isset($_GET['captcha']) && $_GET['captcha'] == 'confirm_error' ) { |
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echo '<label style="color:#FF0000;" id="capt_err">'.esc_html($_SESSION['captcha_error']).'</label><div style="clear:both;"></div>';; |
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$_SESSION['captcha_error'] = ''; |
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} |
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|
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echo '<label>'.__('Type the text displayed above', 'captcha-code-authentication').':</label> |
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<input id="captcha_code" name="captcha_code" size="15" type="text" tabindex="30" /> |
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</p>'; |
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return true; |
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} |
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|
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/* Hook to find out the errors while logging in */ |
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function include_ctl_captcha_login_errors($errors) |
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{ |
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if( isset( $_REQUEST['action'] ) && 'register' == $_REQUEST['action'] ) |
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return($errors); |
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|
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if(esc_html($_SESSION['captcha_code']) != $_REQUEST['captcha_code']){ |
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return $errors.'<label id="capt_err" for="captcha_code_error">'.__('Captcha confirmation error!', 'captcha-code-authentication').'</label>'; |
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} |
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return $errors; |
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} |
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|
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/* Hook to redirect after captcha confirmation */ |
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function include_ctl_captcha_login_redirect($url) |
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{ |
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|
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/* Captcha mismatch */ |
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if(isset($_SESSION['captcha_code']) && isset($_REQUEST['captcha_code']) && esc_html($_SESSION['captcha_code']) != $_REQUEST['captcha_code']){ |
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$_SESSION['captcha_error'] = __('Incorrect captcha confirmation!', 'captcha-code-authentication'); |
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wp_clear_auth_cookie(); |
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return $_SERVER["REQUEST_URI"]."/?captcha='confirm_error'"; |
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} |
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/* Captcha match: take to the admin panel */ |
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else{ |
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return home_url('/wp-admin/'); |
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} |
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} |
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|
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/* <!-- Captcha for login authentication ends here --> */ |
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|
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/* Captcha for Comments ends here */ |
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$comment_captcha = get_option('wpcaptcha_comments'); |
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if($comment_captcha == 'yes') |
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{ |
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global $wp_version; |
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if( version_compare($wp_version,'3','>=') ) { // wp 3.0 + |
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add_action( 'comment_form_after_fields', 'include_ctl_captcha_comment_form_wp3', 1 ); |
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add_action( 'comment_form_logged_in_after', 'include_ctl_captcha_comment_form_wp3', 1 ); |
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} |
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// for WP before WP 3.0 |
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add_action( 'comment_form', 'include_ctl_captcha_comment_form' ); |
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add_filter( 'preprocess_comment', 'include_ctl_captcha_comment_post' ); |
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} |
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|
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/* Function to include captcha for comments form */ |
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function include_ctl_captcha_comment_form() |
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{ |
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$c_registered = get_option('wpcaptcha_registered'); |
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if ( is_user_logged_in() && $c_registered == 'yes') { |
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return true; |
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} |
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echo '<p class="comment-form-captcha"> |
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<label><b>'. __('Captcha', 'captcha-code-authentication').' </b><span class="required">*</span></label> |
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<div style="clear:both;"></div><div style="clear:both;"></div>'; |
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ctl_captcha_generate_code(); |
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echo '<label>'.__('Type the text displayed above', 'captcha-code-authentication').':</label> |
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<input id="captcha_code" name="captcha_code" size="15" type="text" /> |
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<div style="clear:both;"></div> |
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</p>'; |
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return true; |
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} |
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|
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/* Function to include captcha for comments form > wp3 */ |
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function include_ctl_captcha_comment_form_wp3() |
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{ |
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$c_registered = get_option('wpcaptcha_registered'); |
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if ( is_user_logged_in() && $c_registered == 'yes') { |
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return true; |
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} |
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|
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echo '<p class="comment-form-captcha"> |
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<label><b>'. __('Captcha', 'captcha-code-authentication').' </b><span class="required">*</span></label> |
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<div style="clear:both;"></div><div style="clear:both;"></div>'; |
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ctl_captcha_generate_code(); |
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echo '<label>'.__('Type the text displayed above', 'captcha-code-authentication').':</label> |
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<input id="captcha_code" name="captcha_code" size="15" type="text" /> |
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<div style="clear:both;"></div> |
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</p>'; |
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|
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remove_action( 'comment_form', 'include_ctl_captcha_comment_form' ); |
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|
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return true; |
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} |
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|
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// this function checks captcha posted with the comment |
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function include_ctl_captcha_comment_post($comment) |
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{ |
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$c_registered = get_option('wpcaptcha_registered'); |
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if (is_user_logged_in() && $c_registered == 'yes') { |
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return $comment; |
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} |
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|
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// skip captcha for comment replies from the admin menu |
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if ( isset( $_REQUEST['action'] ) && $_REQUEST['action'] == 'replyto-comment' && |
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( check_ajax_referer( 'replyto-comment', '_ajax_nonce', false ) || check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment', false ) ) ) { |
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// skip capthca |
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return $comment; |
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} |
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|
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// Skip captcha for trackback or pingback |
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if ( $comment['comment_type'] != '' && $comment['comment_type'] != 'comment' ) { |
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// skip captcha |
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return $comment; |
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} |
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|
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// If captcha is empty |
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if(empty($_REQUEST['captcha_code'])) |
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wp_die( __('CAPTCHA cannot be empty.', 'captcha-code-authentication' ) ); |
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|
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// captcha was matched |
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if($_SESSION['captcha_code'] == $_REQUEST['captcha_code']) return($comment); |
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else wp_die( __('Error: Incorrect CAPTCHA. Press your browser\'s back button and try again.', 'captcha-code-authentication')); |
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} |
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|
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/* <!-- Captcha for Comments authentication ends here --> */ |
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|
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// Add captcha in the register form |
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$register_captcha = get_option('wpcaptcha_register'); |
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if($register_captcha == 'yes') |
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{ |
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add_action('register_form', 'include_ctl_wp_captcha_register'); |
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add_action( 'register_post', 'include_ctl_captcha_register_post', 10, 3 ); |
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add_action( 'signup_extra_fields', 'include_ctl_wp_captcha_register' ); |
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add_filter( 'wpmu_validate_user_signup', 'include_ctl_captcha_register_validate' ); |
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} |
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|
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/* Function to include captcha for register form */ |
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function include_ctl_wp_captcha_register($default) |
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{ |
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echo '<p class="register-form-captcha"> |
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<label><b>'. __('Captcha', 'captcha-code-authentication').' </b><span class="required">*</span></label> |
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<div style="clear:both;"></div><div style="clear:both;"></div>'; |
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ctl_captcha_generate_code(); |
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echo '<label>'.__('Type the text displayed above', 'captcha-code-authentication').':</label> |
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<input id="captcha_code" name="captcha_code" size="15" type="text" /> |
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</p>'; |
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return true; |
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} |
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|
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/* This function checks captcha posted with registration */ |
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function include_ctl_captcha_register_post($login,$email,$errors) |
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{ |
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// If captcha is blank - add error |
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if ( isset( $_REQUEST['captcha_code'] ) && "" == $_REQUEST['captcha_code'] ) |
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{ |
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$errors->add('captcha_blank', '<strong>'.__('ERROR', 'captcha-code-authentication').'</strong>: '.__('Please complete the CAPTCHA.', 'captcha-code-authentication')); |
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return $errors; |
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} |
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|
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if ( isset( $_REQUEST['captcha_code'] ) && ($_SESSION['captcha_code'] == $_REQUEST['captcha_code'] )) { |
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// captcha was matched |
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} else { |
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$errors->add('captcha_wrong', '<strong>'.__('ERROR', 'captcha-code-authentication').'</strong>: '.__('That CAPTCHA was incorrect.', 'captcha-code-authentication')); |
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} |
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return($errors); |
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} |
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/* End of the function include_ctl_captcha_register_post */ |
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|
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function include_ctl_captcha_register_validate($results) |
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{ |
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if ( isset( $_REQUEST['captcha_code'] ) && "" == $_REQUEST['captcha_code'] ) { |
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$results['errors']->add('captcha_blank', '<strong>'.__('ERROR', 'captcha-code-authentication').'</strong>: '.__('Please complete the CAPTCHA.', 'captcha-code-authentication')); |
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return $results; |
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} |
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|
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if ( isset( $_REQUEST['captcha_code'] ) && ($_SESSION['captcha_code'] == $_REQUEST['captcha_code'] )) { |
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// captcha was matched |
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} else { |
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$results['errors']->add('captcha_wrong', '<strong>'.__('ERROR', 'captcha-code-authentication').'</strong>: '.__('That CAPTCHA was incorrect.', 'captcha-code-authentication')); |
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} |
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return($results); |
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} |
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/* End of the function include_ctl_captcha_register_validate */ |
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|
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$lost_captcha = get_option('wpcaptcha_lost'); |
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// Add captcha into lost password form |
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if($lost_captcha == 'yes'){ |
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add_action( 'lostpassword_form', 'include_ctl_captcha_lostpassword' ); |
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add_action( 'lostpassword_post', 'include_ctl_captcha_lostpassword_post', 10, 3 ); |
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} |
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|
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/* Function to include captcha for lost password form */ |
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function include_ctl_captcha_lostpassword($default) |
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{ |
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echo '<p class="lost-form-captcha"> |
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<label><b>'. __('Captcha', 'captcha-code-authentication').' </b><span class="required">*</span></label> |
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<div style="clear:both;"></div><div style="clear:both;"></div>'; |
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ctl_captcha_generate_code(); |
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echo '<label>'.__('Type the text displayed above', 'captcha-code-authentication').':</label> |
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<input id="captcha_code" name="captcha_code" size="15" type="text" /> |
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</p>'; |
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} |
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|
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function include_wp_captcha_lostpassword_post() { |
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if( isset( $_REQUEST['user_login'] ) && "" == $_REQUEST['user_login'] ) |
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return; |
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|
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// If captcha doesn't entered |
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if ( isset( $_REQUEST['captcha_code'] ) && "" == $_REQUEST['captcha_code'] ) { |
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wp_die( __( 'Please complete the CAPTCHA.', 'captcha-code-authentication' ) ); |
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} |
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|
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// Check entered captcha |
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if ( isset( $_REQUEST['captcha_code'] ) && ($_SESSION['captcha_code'] == $_REQUEST['captcha_code'] )) { |
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return; |
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} else { |
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wp_die( __( 'Error: Incorrect CAPTCHA. Press your browser\'s back button and try again.', 'captcha-code-authentication' ) ); |
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} |
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} |
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|
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function ctl_captcha_generate_code() |
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{ |
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//Settings: You can customize the captcha here |
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$image_width = 120; |
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$image_height = 40; |
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|
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$characters_on_image = get_option('wpcaptcha_total_no_of_characters'); |
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if($characters_on_image < 3 || $characters_on_image > 6) $characters_on_image = 6; |
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|
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$wpcaptcha_type = get_option('wpcaptcha_type'); |
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$wpcaptcha_letters = get_option('wpcaptcha_letters'); |
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|
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$font = dirname(__FILE__) . '/monofont.ttf'; |
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|
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//The characters that can be used in the CAPTCHA code. |
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//avoid confusing characters (l 1 and i for example) |
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if(!empty($wpcaptcha_type) && $wpcaptcha_type == 'alphanumeric') |
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{ |
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switch($wpcaptcha_letters) |
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{ |
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case 'capital': |
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$possible_letters = '23456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
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break; |
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case 'small': |
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$possible_letters = '23456789bcdfghjkmnpqrstvwxyz'; |
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break; |
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case 'capitalsmall': |
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$possible_letters = '23456789bcdfghjkmnpqrstvwxyzABCEFGHJKMNPRSTVWXYZ'; |
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break; |
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default: |
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$possible_letters = '23456789bcdfghjkmnpqrstvwxyz'; |
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break; |
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} |
| 340 |
} |
| 341 |
elseif(!empty($wpcaptcha_type) && $wpcaptcha_type == 'alphabets') |
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{ |
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switch($wpcaptcha_letters) |
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{ |
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case 'capital': |
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$possible_letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
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break; |
| 348 |
case 'small': |
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$possible_letters = 'bcdfghjkmnpqrstvwxyz'; |
| 350 |
break; |
| 351 |
case 'capitalsmall': |
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$possible_letters = 'bcdfghjkmnpqrstvwxyzABCEFGHJKMNPRSTVWXYZ'; |
| 353 |
break; |
| 354 |
default: |
| 355 |
$possible_letters = 'abcdefghijklmnopqrstuvwxyz'; |
| 356 |
break; |
| 357 |
} |
| 358 |
} |
| 359 |
elseif(!empty($wpcaptcha_type) && $wpcaptcha_type == 'numbers') |
| 360 |
{ |
| 361 |
$possible_letters = '0123456789'; |
| 362 |
} |
| 363 |
else |
| 364 |
{ |
| 365 |
$possible_letters = '0123456789'; |
| 366 |
} |
| 367 |
$random_dots = 0; |
| 368 |
$random_lines = 20; |
| 369 |
$captcha_text_color="0x142864"; |
| 370 |
$captcha_noice_color = "0x142864"; |
| 371 |
|
| 372 |
$code = ''; |
| 373 |
|
| 374 |
|
| 375 |
$i = 0; |
| 376 |
while ($i < $characters_on_image) |
| 377 |
{ |
| 378 |
$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1); |
| 379 |
$i++; |
| 380 |
} |
| 381 |
|
| 382 |
|
| 383 |
$font_size = $image_height * 0.75; |
| 384 |
$image = @imagecreate($image_width, $image_height); |
| 385 |
|
| 386 |
|
| 387 |
/* setting the background, text and noise colours here */ |
| 388 |
$background_color = imagecolorallocate($image, 255, 255, 255); |
| 389 |
|
| 390 |
$arr_text_color = ctl_captcha_hexrgb($captcha_text_color); |
| 391 |
$text_color = imagecolorallocate($image, $arr_text_color['red'], |
| 392 |
$arr_text_color['green'], $arr_text_color['blue']); |
| 393 |
|
| 394 |
$arr_noice_color = ctl_captcha_hexrgb($captcha_noice_color); |
| 395 |
$image_noise_color = imagecolorallocate($image, $arr_noice_color['red'], |
| 396 |
$arr_noice_color['green'], $arr_noice_color['blue']); |
| 397 |
|
| 398 |
|
| 399 |
/* generating the dots randomly in background */ |
| 400 |
for( $i=0; $i<$random_dots; $i++ ) |
| 401 |
{ |
| 402 |
imagefilledellipse($image, mt_rand(0,$image_width), mt_rand(0,$image_height), 2, 3, $image_noise_color); |
| 403 |
} |
| 404 |
|
| 405 |
|
| 406 |
/* generating lines randomly in background of image */ |
| 407 |
for( $i=0; $i<$random_lines; $i++ ) { |
| 408 |
imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height), mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color); |
| 409 |
} |
| 410 |
|
| 411 |
|
| 412 |
/* create a text box and add 6 letters code in it */ |
| 413 |
$textbox = imagettfbbox($font_size, 0, $font, $code); |
| 414 |
$x = ($image_width - $textbox[4])/2; |
| 415 |
$y = ($image_height - $textbox[5])/2; |
| 416 |
imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code); |
| 417 |
|
| 418 |
ob_start(); |
| 419 |
imagejpeg($image);//showing the image |
| 420 |
printf('<img src="data:image/png;base64,%s"/ width="100">', base64_encode(ob_get_clean())); |
| 421 |
imagedestroy($image);//destroying the image instance |
| 422 |
$_SESSION['captcha_code'] = $code; |
| 423 |
} |
| 424 |
|
| 425 |
function ctl_captcha_hexrgb ($hexstr) |
| 426 |
{ |
| 427 |
$int = hexdec($hexstr); |
| 428 |
|
| 429 |
return array("red" => 0xFF & ($int >> 0x10), |
| 430 |
"green" => 0xFF & ($int >> 0x8), |
| 431 |
"blue" => 0xFF & $int); |
| 432 |
} |
| 433 |
?> |
| 434 |
|
