<?php

require_once ABSPATH . '/wp-admin/includes/plugin.php';

class SiteGuard_RenameLogin extends SiteGuard_Base {
	private $denied_login;
	protected static $incompatible_plugins = array(
		'WordPress HTTPS (SSL)' => 'wordpress-https/wordpress-https.php',
		'qTranslate X'          => 'qtranslate-x/qtranslate.php',
	);
	public static $htaccess_mark           = '#==== SITEGUARD_RENAME_LOGIN_SETTINGS';

	function __construct() {
		global $siteguard_config;
		if ( '1' == $siteguard_config->get( 'renamelogin_enable' ) ) {
			if ( null !== $this->get_active_incompatible_plugins() ) {
				$siteguard_config->set( 'renamelogin_enable', '0' );
				$siteguard_config->update();
				$this->feature_off();
				return;
			}
			$this->add_filter();
		}
	}
	static function get_mark() {
		return self::$htaccess_mark;
	}
	function init() {
		global $siteguard_config;
		$this->denied_login = false;
		$siteguard_config->set( 'renamelogin_path', 'login_' . sprintf( '%05d', siteguard_rand( 1, 99999 ) ) );
		$siteguard_config->set( 'redirect_enable', '0' );
		$siteguard_config->update();
		if ( $this->check_module( 'rewrite' ) &&
			null === $this->get_active_incompatible_plugins() &&
			true === siteguard_check_multisite() &&
			SiteGuard_Htaccess::test_htaccess()
		) {
			$siteguard_config->set( 'renamelogin_enable', '1' );
			$siteguard_config->update();
			if ( false === $this->feature_on() ) {
				$siteguard_config->set( 'renamelogin_enable', '0' );
				$siteguard_config->update();
			}
		} else {
			$siteguard_config->set( 'renamelogin_enable', '0' );
			$siteguard_config->update();
		}
	}
	function get_active_incompatible_plugins() {
		$result = array();
		foreach ( self::$incompatible_plugins as $name => $path ) {
			if ( is_plugin_active( $path ) ) {
				array_push( $result, $name );
			}
		}
		if ( empty( $result ) ) {
			return null;
		} else {
			return $result;
		}
	}
	function add_filter() {
		add_filter( 'plugins_loaded', array( $this, 'handler_plugins_loaded' ), 9999 );
		add_filter( 'login_init', array( $this, 'handler_login_init' ), 10, 2 );
		add_filter( 'site_url', array( $this, 'handler_site_url' ), 10, 2 );
		add_filter( 'network_site_url', array( $this, 'handler_site_url' ), 10, 2 );
		add_filter( 'wp_redirect', array( $this, 'handler_wp_redirect' ), 10, 2 );
		add_filter( 'register', array( $this, 'handler_register' ) );
		add_filter( 'auth_redirect_scheme', array( $this, 'handler_stop_redirect' ), 9999 );
		remove_action( 'template_redirect', 'wp_redirect_admin_locations', 1000 );
	}
	function handler_login_init() {
		global $siteguard_config;
		$new_login_page = $siteguard_config->get( 'renamelogin_path' );
		if ( isset( $_SERVER['REQUEST_URI'] ) ) {
			$link = sanitize_url( $_SERVER['REQUEST_URI'] );
		} else {
			$link = '';
		}
		if ( false !== strpos( $link, 'wp-login' ) ) {
			$referer = wp_get_referer();
			if ( false === strpos( $referer, $new_login_page ) ) {
				$this->set_404();
			} else {
				$result = $this->convert_url( $link );
				wp_redirect( $result );
			}
		}
	}
	function convert_url( $link ) {
		global $siteguard_config;
		$result = $link;
		$custom_login_url = $siteguard_config->get( 'renamelogin_path' );
		if ( false !== strpos( $link, 'wp-login.php?action=register' ) && $this->denied_login) {
			$this->set_404();
		} else {
			if ( false !== strpos( $link, 'wp-login.php' ) ) {
				$result = str_replace( 'wp-login.php', $custom_login_url, $link );
			}
		}
		return $result;
	}
	function handler_site_url( $link ) {
		$result = $this->convert_url( $link );
		return $result;
	}
	function handler_register( $link ) {
		$result = $this->convert_url( $link );
		return $result;
	}
	function handler_wp_redirect( $link, $status_code ) {
		if ( ( ( strlen( $link ) <= 5 || 'http:' !== strtolower( substr( $link, 0, 5 ) ) ) && ( strlen( $link ) <= 6 || 'https:' !== strtolower( substr( $link, 0, 6 ) ) ) )
		|| ( isset( $_SERVER['HTTPS'] ) && strtolower( $_SERVER['HTTPS'] ) !== 'off' && 'https' === strtolower( substr( $link, 0, strpos( $link, '://' ) ) ) )
		|| ( ( ! isset( $_SERVER['HTTPS'] ) || strtolower( $_SERVER['HTTPS'] ) === 'off' ) && 'http' === strtolower( substr( $link, 0, strpos( $link, '://' ) ) ) ) ) {
			$result = $this->convert_url( $link );
		} else {
			$result = $link;
		}
		return $result;
	}
	function insert_rewrite_rules( $rules ) {
		global $siteguard_config;
		$custom_login_url                        = $siteguard_config->get( 'renamelogin_path' );
		$newrules                                = array();
		$newrules[ $custom_login_url . '(.*)$' ] = 'wp-login.php$1';
		return $newrules + $rules;
	}
	function update_settings() {
		global $siteguard_config;
		$custom_login_url = $siteguard_config->get( 'renamelogin_path' );
		$parse_url        = parse_url( site_url() );
		if ( false === $parse_url ) {
			$base = '/';
		} else {
			if ( isset( $parse_url['path'] ) ) {
				$base = $parse_url['path'] . '/';
			} else {
				$base = '/';
			}
		}

		$htaccess_str  = "<IfModule mod_rewrite.c>\n";
		$htaccess_str .= "    RewriteEngine on\n";
		$htaccess_str .= "    RewriteBase $base\n";
		$htaccess_str .= "    RewriteRule ^wp-signup\.php 404-siteguard [L]\n";
		$htaccess_str .= "    RewriteRule ^wp-activate\.php 404-siteguard [L]\n";
		$htaccess_str .= "    RewriteRule ^$custom_login_url(.*)$ wp-login.php$1 [L]\n";
		$htaccess_str .= "</IfModule>\n";

		return $htaccess_str;
	}
	function feature_on() {
		global $siteguard_htaccess;
		if ( false === SiteGuard_Htaccess::check_permission() ) {
			return false;
		}
		$data = $this->update_settings();
		$mark = $this->get_mark();
		return $siteguard_htaccess->update_settings( $mark, $data );
	}
	static function feature_off() {
		$mark = self::get_mark();
		return SiteGuard_Htaccess::clear_settings( $mark );
	}
	function set_404() {
		global $wp_query;
		status_header( 404 );
		$wp_query->set_404();
		if ( ( ( $template = get_404_template() ) || ( $template = get_index_template() ) )
		&& ( $template = apply_filters( 'template_include', $template ) ) ) {
			include $template;
		}
		die;
	}
	function send_notify() {
		global $siteguard_config;
		$subject = esc_html__( 'WordPress: Login page URL was changed', 'siteguard' );
		$body    = sprintf( esc_html__( "Please bookmark following of the new login URL.\n\n%s\n\n--\nSiteGuard WP Plugin", 'siteguard' ), site_url() . '/' . $siteguard_config->get( 'renamelogin_path' ) );

		$user_query = new WP_User_Query( array( 'role' => 'Administrator' ) );
		if ( ! empty( $user_query->results ) ) {
			foreach ( $user_query->results as $user ) {
				$user_email = $user->get( 'user_email' );
				if ( true !== @wp_mail( $user_email, $subject, $body ) ) {
					siteguard_error_log( 'Failed send mail. To:' . $user_email . ' Subject:' . esc_html( $subject ) );
				}
			}
		}
	}
	function handler_stop_redirect( $scheme ) {
		global $siteguard_config;
		$redirect_enable = $siteguard_config->get( 'redirect_enable' );
		if ( $redirect_enable == 1 ) {
			if ( $user_id = wp_validate_auth_cookie( '', $scheme ) ) {
				return $scheme;
			}
			wp_safe_redirect( home_url() );
			exit;
		}
	}
	function handler_plugins_loaded() {
		if ( ! isset( $_SERVER['REQUEST_URI'] ) ) {
			return;
		}
		$request = parse_url( $_SERVER['REQUEST_URI'] );
		$denied_slugs = array( 'wp-register' );
		$denied_slugs_to_regex = implode( '|', $denied_slugs );
		$is_denied = preg_match( '#\/(' . $denied_slugs_to_regex . ')(\.php)?$#i', untrailingslashit( $request['path'] ) );
		if ( $is_denied && ! is_admin() ) {
			$this->denied_login = true;
		}
	}
}
