<?php

class AIOWPSecurity_General_Init_Tasks
{
    function __construct(){
        global $aio_wp_security;
        
        if ($aio_wp_security->configs->get_value('aiowps_disable_xmlrpc_pingback_methods') == '1') {
            add_filter( 'xmlrpc_methods', array(&$this, 'aiowps_disable_xmlrpc_pingback_methods') );
            add_filter( 'wp_headers', array(&$this, 'aiowps_remove_x_pingback_header') );
        }

        add_action( 'permalink_structure_changed', array(&$this, 'refresh_firewall_rules' ), 10, 2);

        if ($aio_wp_security->configs->get_value('aiowps_enable_autoblock_spam_ip') == '1') {
            AIOWPSecurity_Blocking::check_visitor_ip_and_perform_blocking();

            //add_action( 'spammed_comment', array(&$this, 'process_spammed_comment' )); //this hook gets fired when admin marks comment as spam
            //add_action( 'akismet_submit_spam_comment', array(&$this, 'process_akismet_submit_spam_comment' ), 10, 2); //this hook gets fired when akismet marks a comment as spam
            add_action( 'comment_post', array(&$this, 'spam_detect_process_comment_post' ), 10, 2); //this hook gets fired just after comment is saved to DB
            add_action( 'transition_comment_status', array(&$this, 'process_transition_comment_status' ), 10, 3); //this hook gets fired when a comment's status changes
        }

        if ($aio_wp_security->configs->get_value('aiowps_enable_rename_login_page') == '1') {
            add_action( 'widgets_init', array(&$this, 'remove_standard_wp_meta_widget' ));
            add_filter( 'retrieve_password_message', array(&$this, 'decode_reset_pw_msg'), 10, 4); //Fix for non decoded html entities in password reset link
        }

        add_action('admin_notices', array(&$this,'reapply_htaccess_rules_notice'));
        if(isset($_REQUEST['aiowps_reapply_htaccess'])){
            if(strip_tags($_REQUEST['aiowps_reapply_htaccess']) == 1){
                include_once ('wp-security-installer.php');
                if(AIOWPSecurity_Installer::reactivation_tasks()){
                    echo '<div class="updated"><p>The AIOWPS .htaccess rules were successfully re-inserted.</p></div>';
                }else{
                    echo '<div class="error"><p>AIOWPS encountered an error when trying to write to your .htaccess file. Please check the logs.</p></div>';
                }
                
            }elseif(strip_tags($_REQUEST['aiowps_reapply_htaccess']) == 2){
                //Don't re-write the rules and just delete the temp config item
                delete_option('aiowps_temp_configs');
            }
        }
        
        if($aio_wp_security->configs->get_value('aiowps_prevent_site_display_inside_frame') == '1'){
            send_frame_options_header(); //send X-Frame-Options: SAMEORIGIN in HTTP header
        }

        if($aio_wp_security->configs->get_value('aiowps_remove_wp_generator_meta_info') == '1'){
            add_filter('the_generator', array(&$this,'remove_wp_generator_meta_info'));
            add_filter('style_loader_src', array(&$this,'remove_wp_css_js_meta_info'));
            add_filter('script_loader_src', array(&$this,'remove_wp_css_js_meta_info'));
        }
        
        //For the cookie based brute force prevention feature
        if($aio_wp_security->configs->get_value('aiowps_enable_brute_force_attack_prevention') == 1){
            $bfcf_secret_word = $aio_wp_security->configs->get_value('aiowps_brute_force_secret_word');
            if(isset($_GET[$bfcf_secret_word])){
                //If URL contains secret word in query param then set cookie and then redirect to the login page
                AIOWPSecurity_Utility::set_cookie_value($bfcf_secret_word, "1");
                AIOWPSecurity_Utility::redirect_to_url(AIOWPSEC_WP_URL."/wp-admin");
            }
        }
        
        //Stop users enumeration feature
        if( $aio_wp_security->configs->get_value('aiowps_prevent_users_enumeration') == 1) {
            include_once(AIO_WP_SECURITY_PATH.'/other-includes/wp-security-stop-users-enumeration.php');
        }
        
        //For user unlock request feature
        if(isset($_POST['aiowps_unlock_request']) || isset($_POST['aiowps_wp_submit_unlock_request'])){
            nocache_headers();            
            remove_action('wp_head','head_addons',7);
            include_once(AIO_WP_SECURITY_PATH.'/other-includes/wp-security-unlock-request.php');
            exit();
        }
        
        if(isset($_GET['aiowps_auth_key'])){
            //If URL contains unlock key in query param then process the request
            $unlock_key = strip_tags($_GET['aiowps_auth_key']);
            AIOWPSecurity_User_Login::process_unlock_request($unlock_key);
        }

        //For honeypot feature
        if(isset($_POST['aio_special_field'])){
            $special_field_value = strip_tags($_POST['aio_special_field']);
            if(!empty($special_field_value)){
                //This means a robot has submitted the login form!
                //Redirect back to its localhost
                AIOWPSecurity_Utility::redirect_to_url('http://127.0.0.1');
            }
        }
        
        //For 404 IP lockout feature
        if($aio_wp_security->configs->get_value('aiowps_enable_404_IP_lockout') == '1'){
            if (!is_user_logged_in() || !current_user_can('administrator')) {
                $this->do_404_lockout_tasks();
            }
        }


        //For login captcha feature
        if($aio_wp_security->configs->get_value('aiowps_enable_login_captcha') == '1'){
            if (!is_user_logged_in()) {
                add_action('login_form', array(&$this, 'insert_captcha_question_form'));
            }
        }

        //For custom login form captcha feature, ie, when wp_login_form() function is used to generate login form
        if($aio_wp_security->configs->get_value('aiowps_enable_custom_login_captcha') == '1'){
            if (!is_user_logged_in()) {
                add_filter( 'login_form_middle', array(&$this, 'insert_captcha_custom_login'), 10, 2); //For cases where the WP wp_login_form() function is used
            }
        }

        //For honeypot feature
        if($aio_wp_security->configs->get_value('aiowps_enable_login_honeypot') == '1'){
            if (!is_user_logged_in()) {
                add_action('login_form', array(&$this, 'insert_honeypot_hidden_field'));
            }
        }
        
        //For lost password captcha feature
        if($aio_wp_security->configs->get_value('aiowps_enable_lost_password_captcha') == '1'){
            if (!is_user_logged_in()) {
                add_action('lostpassword_form', array(&$this, 'insert_captcha_question_form'));
                add_action('lostpassword_post', array(&$this, 'process_lost_password_form_post'));
            }
        }

        //For registration manual approval feature
        if($aio_wp_security->configs->get_value('aiowps_enable_manual_registration_approval') == '1'){
            add_filter('wp_login_errors', array(&$this, 'modify_registration_page_messages'),10, 2);
        }
        
        //For registration page captcha feature
        if (AIOWPSecurity_Utility::is_multisite_install()){
            $blog_id = get_current_blog_id();
            switch_to_blog($blog_id);
            if($aio_wp_security->configs->get_value('aiowps_enable_registration_page_captcha') == '1'){
                if (!is_user_logged_in()) {
                    add_action('signup_extra_fields', array(&$this, 'insert_captcha_question_form_multi'));
                    //add_action('preprocess_signup_form', array(&$this, 'process_signup_form_multi'));
                    add_filter( 'wpmu_validate_user_signup', array(&$this, 'process_signup_form_multi') );
                    
                }
            }
            restore_current_blog();
        }else{
            if($aio_wp_security->configs->get_value('aiowps_enable_registration_page_captcha') == '1'){
                if (!is_user_logged_in()) {
                    add_action('register_form', array(&$this, 'insert_captcha_question_form'));
                }
            }
        }

        //For comment captcha feature
        if (AIOWPSecurity_Utility::is_multisite_install()){
            $blog_id = get_current_blog_id();
            switch_to_blog($blog_id);
            if($aio_wp_security->configs->get_value('aiowps_enable_comment_captcha') == '1'){
                add_action( 'comment_form_after_fields', array(&$this, 'insert_captcha_question_form'), 1 );
                add_action( 'comment_form_logged_in_after', array(&$this, 'insert_captcha_question_form'), 1 );
                add_filter( 'preprocess_comment', array(&$this, 'process_comment_post') );
            }
            restore_current_blog();
        }else{
            if($aio_wp_security->configs->get_value('aiowps_enable_comment_captcha') == '1'){
                add_action( 'comment_form_after_fields', array(&$this, 'insert_captcha_question_form'), 1 );
                add_action( 'comment_form_logged_in_after', array(&$this, 'insert_captcha_question_form'), 1 );
                add_filter( 'preprocess_comment', array(&$this, 'process_comment_post') );
            }
        }
        
        //For buddypress registration captcha feature
        if($aio_wp_security->configs->get_value('aiowps_enable_bp_register_captcha') == '1'){
            add_action('bp_account_details_fields', array(&$this, 'insert_captcha_question_form'));
            add_action('bp_signup_validate', array(&$this, 'buddy_press_signup_validate_captcha'));
        }
        
        
        //For feature which displays logged in users
        $this->update_logged_in_user_transient();
        
        //For block fake googlebots feature
        if($aio_wp_security->configs->get_value('aiowps_block_fake_googlebots') == '1'){
            include_once(AIO_WP_SECURITY_PATH.'/classes/wp-security-bot-protection.php');
            AIOWPSecurity_Fake_Bot_Protection::block_fake_googlebots();
        }
        
        //For 404 event logging
        if($aio_wp_security->configs->get_value('aiowps_enable_404_logging') == '1'){
            add_action('wp_head', array(&$this, 'check_404_event'));
        }

        //Add more tasks that need to be executed at init time
        
    }
    
    function aiowps_disable_xmlrpc_pingback_methods( $methods ) {
       unset( $methods['pingback.ping'] );
       unset( $methods['pingback.extensions.getPingbacks'] );
       return $methods;
    }
    
    function aiowps_remove_x_pingback_header( $headers ) {
       unset( $headers['X-Pingback'] );
       return $headers;
    }

    /**
     * Refreshes the firewall rules in .htaccess file
     * eg: if permalink settings changed and white list enabled
     * @param $old_permalink_structure
     * @param $permalink_structure
     */
    function refresh_firewall_rules($old_permalink_structure, $permalink_structure){
        global $aio_wp_security;
        //If white list enabled need to re-adjust the .htaccess rules
        if ($aio_wp_security->configs->get_value('aiowps_enable_whitelisting') == '1') {
            $write_result = AIOWPSecurity_Utility_Htaccess::write_to_htaccess(); //now let's write to the .htaccess file
            if ( !$write_result )
            {
                $this->show_msg_error(__('The plugin was unable to write to the .htaccess file. Please edit file manually.','all-in-one-wp-security-and-firewall'));
                $aio_wp_security->debug_logger->log_debug("AIOWPSecurity_whitelist_Menu - The plugin was unable to write to the .htaccess file.");
            }
        }
    }

    function spam_detect_process_comment_post($comment_id, $comment_approved)
    {
        if($comment_approved === "spam"){
            $this->block_comment_ip($comment_id);
        }

    }

    function process_transition_comment_status($new_status, $old_status, $comment)
    {
        if($new_status == 'spam'){
            $this->block_comment_ip($comment->comment_ID);
        }

    }

    /**
     * Will check auto-spam blocking settings and will add IP to blocked table accordingly
     * @param $comment_id
     */
    function block_comment_ip($comment_id)
    {
        global $aio_wp_security, $wpdb;
        $comment_obj = get_comment( $comment_id );
        $comment_ip = $comment_obj->comment_author_IP;
        //Get number of spam comments from this IP
        $sql = $wpdb->prepare("SELECT * FROM $wpdb->comments
                WHERE comment_approved = 'spam'
                AND comment_author_IP = %s
                ", $comment_ip);
        $comment_data = $wpdb->get_results($sql, ARRAY_A);
        $spam_count = count($comment_data);
        $min_comment_before_block = $aio_wp_security->configs->get_value('aiowps_spam_ip_min_comments_block');
        if(!empty($min_comment_before_block) && $spam_count >= ($min_comment_before_block - 1)){
            AIOWPSecurity_Blocking::add_ip_to_block_list($comment_ip, 'spam');
        }
    }

    function remove_standard_wp_meta_widget()
    {
        unregister_widget('WP_Widget_Meta');
    }    

    function remove_wp_generator_meta_info()
    {
        return '';
    }

    function remove_wp_css_js_meta_info($src) {
        global $wp_version;
        static $wp_version_hash = null; // Cache hash value for all function calls

        // Replace only version number of assets with WP version
        if ( strpos($src, 'ver=' . $wp_version) !== false ) {
            if ( !$wp_version_hash ) {
                $wp_version_hash = wp_hash($wp_version);
            }
            // Replace version number with computed hash
            $src = add_query_arg('ver', $wp_version_hash, $src);
        }
        return $src;
    }

    function do_404_lockout_tasks(){
        global $aio_wp_security;
        $redirect_url = $aio_wp_security->configs->get_value('aiowps_404_lock_redirect_url'); //This is the redirect URL for blocked users
        
        $visitor_ip = AIOWPSecurity_Utility_IP::get_user_ip_address();
        
        $is_locked = AIOWPSecurity_Utility::check_locked_ip($visitor_ip);
        
        if($is_locked){
            //redirect blocked user to configured URL
            AIOWPSecurity_Utility::redirect_to_url($redirect_url);
        }else{
            //allow through
        }
    }

    function update_logged_in_user_transient(){
        if(is_user_logged_in()){
            $current_user_ip = AIOWPSecurity_Utility_IP::get_user_ip_address();
            // get the logged in users list from transients entry
            $logged_in_users = (AIOWPSecurity_Utility::is_multisite_install() ? get_site_transient('users_online') : get_transient('users_online'));
            $current_user = wp_get_current_user();
            $current_user = $current_user->ID;  
            $current_time = current_time('timestamp');

            $current_user_info = array("user_id" => $current_user, "last_activity" => $current_time, "ip_address" => $current_user_ip); //We will store last activity time and ip address in transient entry

            if($logged_in_users === false || $logged_in_users == NULL){
                $logged_in_users = array();
                $logged_in_users[] = $current_user_info;
                AIOWPSecurity_Utility::is_multisite_install() ? set_site_transient('users_online', $logged_in_users, 30 * 60) : set_transient('users_online', $logged_in_users, 30 * 60);
            }
            else
            {
                $key = 0;
                $do_nothing = false;
                $update_existing = false;
                $item_index = 0;
                foreach ($logged_in_users as $value)
                {
                    if($value['user_id'] == $current_user && strcmp($value['ip_address'], $current_user_ip) == 0)
                    {
                        if ($value['last_activity'] < ($current_time - (15 * 60)))
                        {
                            $update_existing = true;
                            $item_index = $key;
                            break;
                        }else{
                            $do_nothing = true;
                            break;
                        }
                    }
                    $key++;
                }

                if($update_existing)
                {
                    //Update transient if the last activity was less than 15 min ago for this user
                    $logged_in_users[$item_index] = $current_user_info;
                    AIOWPSecurity_Utility::is_multisite_install() ? set_site_transient('users_online', $logged_in_users, 30 * 60) : set_transient('users_online', $logged_in_users, 30 * 60);
                }else if($do_nothing){
                    //Do nothing
                }else{
                    $logged_in_users[] = $current_user_info;
                    AIOWPSecurity_Utility::is_multisite_install() ? set_site_transient('users_online', $logged_in_users, 30 * 60) : set_transient('users_online', $logged_in_users, 30 * 60);
                }
            }
        }
    }
    
    function insert_captcha_custom_login($cust_html_code, $args)
    {
        global $aio_wp_security;
        $cap_form = '<p class="aiowps-captcha"><label>'.__('Please enter an answer in digits:','all-in-one-wp-security-and-firewall').'</label>';
        $cap_form .= '<div class="aiowps-captcha-equation"><strong>';
        $maths_question_output = $aio_wp_security->captcha_obj->generate_maths_question();
        $cap_form .= $maths_question_output . '</strong></div></p>';
        
        $cust_html_code .= $cap_form;
        return $cust_html_code;
    }
    
    function insert_captcha_question_form_multi($error)
    {
        global $aio_wp_security;
        $aio_wp_security->captcha_obj->display_captcha_form();
    }
    
    function process_signup_form_multi($result)
    {
        global $aio_wp_security;
        //Check if captcha enabled
        if (array_key_exists('aiowps-captcha-answer', $_POST)) //If the register form with captcha was submitted then do some processing
        {
            isset($_POST['aiowps-captcha-answer'])?$captcha_answer = strip_tags(trim($_POST['aiowps-captcha-answer'])): $captcha_answer = '';
            $captcha_secret_string = $aio_wp_security->configs->get_value('aiowps_captcha_secret_key');
            $submitted_encoded_string = base64_encode($_POST['aiowps-captcha-temp-string'].$captcha_secret_string.$captcha_answer);
            $trans_handle = sanitize_text_field($_POST['aiowps-captcha-string-info']);
            $captcha_string_info_trans = (AIOWPSecurity_Utility::is_multisite_install() ? get_site_transient('aiowps_captcha_string_info_'.$trans_handle) : get_transient('aiowps_captcha_string_info_'.$trans_handle));
            if($submitted_encoded_string !== $captcha_string_info_trans)
            {
                //This means a wrong answer was entered
                $result['errors']->add('generic', __('<strong>ERROR</strong>: Your answer was incorrect - please try again.', 'all-in-one-wp-security-and-firewall'));
            }
        }
        return $result;
    }
    
    function insert_captcha_question_form(){
        global $aio_wp_security;
        $aio_wp_security->captcha_obj->display_captcha_form();
    }

    function insert_honeypot_hidden_field(){
        $honey_input = '<p style="display: none;"><label>'.__('Enter something special:','all-in-one-wp-security-and-firewall').'</label>';
        $honey_input .= '<input name="aio_special_field" type="text" id="aio_special_field" class="aio_special_field" /></p>';
        echo $honey_input;
    }
    
    function process_comment_post( $comment ) 
    {
        global $aio_wp_security;
        if (is_user_logged_in()) {
                return $comment;
        }

        //Don't process captcha for comment replies inside 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))) {
            return $comment;
        }

        //Don't do captcha for pingback/trackback
        if ($comment['comment_type'] != '' && $comment['comment_type'] != 'comment') {
            return $comment;
        }

        if (isset($_REQUEST['aiowps-captcha-answer']))
        {
            // If answer is empty
            if ($_REQUEST['aiowps-captcha-answer'] == ''){
                wp_die( __('Please enter an answer in the CAPTCHA field.', 'all-in-one-wp-security-and-firewall' ) );
            }
            $captcha_answer = trim($_REQUEST['aiowps-captcha-answer']);
            $captcha_secret_string = $aio_wp_security->configs->get_value('aiowps_captcha_secret_key');
            $submitted_encoded_string = base64_encode($_POST['aiowps-captcha-temp-string'].$captcha_secret_string.$captcha_answer);
            $trans_handle = sanitize_text_field($_POST['aiowps-captcha-string-info']);
            $captcha_string_info_trans = (AIOWPSecurity_Utility::is_multisite_install() ? get_site_transient('aiowps_captcha_string_info_'.$trans_handle) : get_transient('aiowps_captcha_string_info_'.$trans_handle));

            if ($captcha_string_info_trans === $submitted_encoded_string){
                //Correct answer given
                return($comment);
            }else{
                //Wrong answer
                wp_die( __('Error: You entered an incorrect CAPTCHA answer. Please go back and try again.', 'all-in-one-wp-security-and-firewall'));
            }
        }
    }
    
    function process_lost_password_form_post() 
    {
        global $aio_wp_security;
        //Check if captcha enabled
        if ($aio_wp_security->configs->get_value('aiowps_enable_lost_password_captcha') == '1')
        {
            if (array_key_exists('aiowps-captcha-answer', $_POST)) //If the lost pass form with captcha was submitted then do some processing
            {
                isset($_POST['aiowps-captcha-answer'])?($captcha_answer = strip_tags(trim($_POST['aiowps-captcha-answer']))):($captcha_answer = '');
                $captcha_secret_string = $aio_wp_security->configs->get_value('aiowps_captcha_secret_key');
                $submitted_encoded_string = base64_encode($_POST['aiowps-captcha-temp-string'].$captcha_secret_string.$captcha_answer);
                $trans_handle = sanitize_text_field($_POST['aiowps-captcha-string-info']);
                $captcha_string_info_trans = (AIOWPSecurity_Utility::is_multisite_install() ? get_site_transient('aiowps_captcha_string_info_'.$trans_handle) : get_transient('aiowps_captcha_string_info_'.$trans_handle));

                if($submitted_encoded_string !== $captcha_string_info_trans)
                {
                    add_filter('allow_password_reset', array(&$this, 'add_lostpassword_captcha_error_msg'));
                }
            }
        }
        
    }
    
    function add_lostpassword_captcha_error_msg()
    {
        //Insert an error just before the password reset process kicks in
        return new WP_Error('aiowps_captcha_error',__('<strong>ERROR</strong>: Your answer was incorrect - please try again.', 'all-in-one-wp-security-and-firewall'));
    }
    
    function check_404_event()
    {
        if(is_404()){
            //This means a 404 event has occurred - let's log it!
            AIOWPSecurity_Utility::event_logger('404');
        }
        
    }   
    
    function buddy_press_signup_validate_captcha($errors)
    {
        global $bp, $aio_wp_security;
        //Check if captcha enabled
        if (array_key_exists('aiowps-captcha-answer', $_POST)) //If the register form with captcha was submitted then do some processing
        {
            isset($_POST['aiowps-captcha-answer'])?$captcha_answer = strip_tags(trim($_POST['aiowps-captcha-answer'])): $captcha_answer = '';
            $captcha_secret_string = $aio_wp_security->configs->get_value('aiowps_captcha_secret_key');
            $submitted_encoded_string = base64_encode($_POST['aiowps-captcha-temp-string'].$captcha_secret_string.$captcha_answer);
            $trans_handle = sanitize_text_field($_POST['aiowps-captcha-string-info']);
            $captcha_string_info_trans = (AIOWPSecurity_Utility::is_multisite_install() ? get_site_transient('aiowps_captcha_string_info_'.$trans_handle) : get_transient('aiowps_captcha_string_info_'.$trans_handle));

            if($submitted_encoded_string !== $captcha_string_info_trans)
            {
                //This means a wrong answer was entered
                $bp->signup->errors['aiowps-captcha-answer'] = __('Your CAPTCHA answer was incorrect - please try again.', 'all-in-one-wp-security-and-firewall');
            }
        }

        return;
    }
    
    //Displays a notice message if the plugin was reactivated after being initially deactivated.
    //Notice message gives users option of re-applying the aiowps rules which were deleted from the .htaccess when deactivation occurred
    function reapply_htaccess_rules_notice()
    {
        if (get_option('aiowps_temp_configs') !== FALSE){
            echo '<div class="updated"><p>Would you like All In One WP Security & Firewall to re-insert the security rules in your .htaccess file which were cleared when you deactivated the plugin?&nbsp;&nbsp;<a href="admin.php?page='.AIOWPSEC_MENU_SLUG_PREFIX.'&aiowps_reapply_htaccess=1" class="button-primary">Yes</a>&nbsp;&nbsp;<a href="admin.php?page='.AIOWPSEC_MENU_SLUG_PREFIX.'&aiowps_reapply_htaccess=2" class="button-primary">No</a></p></div>';
        }
    }
    
    //This is a fix for cases when the password reset URL in the email was not decoding all html entities properly
    function decode_reset_pw_msg($message, $key, $user_login, $user_data)
    {
        global $aio_wp_security;
        $message = html_entity_decode($message);
        return $message;
    }
    
    function modify_registration_page_messages($errors, $redirect_to)
    {
        if( isset($_GET['checkemail']) && 'registered' == $_GET['checkemail'] ){
            if(is_wp_error($errors)){
                $errors->remove('registered');
                $pending_approval_msg = __('Your registration is pending approval.', 'all-in-one-wp-security-and-firewall');
                $pending_approval_msg = apply_filters('aiowps_pending_registration_message', $pending_approval_msg);
                $errors->add('registered', $pending_approval_msg, array('registered'=>'message'));
            }
        }
        return $errors;
    }
}