<?php
/**
 * Output the login page header.
 *
 * @param string   $title    Optional. WordPress login Page title to display in the `<title>` element.
 *                           Default 'Log In'.
 * @param string   $message  Optional. Message to display in header. Default empty.
 * @param WP_Error $wp_error Optional. The error to pass. Default empty.
 */
function login_header( $title = 'Log In', $message = '', $wp_error = '' ) {
	global $error, $interim_login, $action;

	// Don't index any of these forms
	add_action( 'login_head', 'wp_no_robots' );

	if ( wp_is_mobile() )
		add_action( 'login_head', 'wp_login_viewport_meta' );

	if ( empty($wp_error) )
		$wp_error = new WP_Error();

	// Shake it!
	$shake_error_codes = array( 'empty_password', 'empty_email', 'invalid_email', 'invalidcombo', 'empty_username', 'invalid_username', 'incorrect_password' );
	/**
	 * Filter the error codes array for shaking the login form.
	 *
	 * @since 3.0.0
	 *
	 * @param array $shake_error_codes Error codes that shake the login form.
	 */
	$shake_error_codes = apply_filters( 'shake_error_codes', $shake_error_codes );

	if ( $shake_error_codes && $wp_error->get_error_code() && in_array( $wp_error->get_error_code(), $shake_error_codes ) )
		add_action( 'login_head', 'wp_shake_js', 12 );

	?><!DOCTYPE html>
	<!--[if IE 8]>
	<html xmlns="http://www.w3.org/1999/xhtml" class="ie8" <?php language_attributes(); ?>>
	<![endif]-->
	<!--[if !(IE 8) ]><!-->
	<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
	<!--<![endif]-->
	<head>
		<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
		<title><?php bloginfo('name'); ?> &rsaquo; <?php echo $title; ?></title>
		<?php

		wp_admin_css( 'login', true );

		/*
		 * Remove all stored post data on logging out.
		 * This could be added by add_action('login_head'...) like wp_shake_js(),
		 * but maybe better if it's not removable by plugins
		 */
		if ( 'loggedout' == $wp_error->get_error_code() ) {
			?>
			<script>if("sessionStorage" in window){try{for(var key in sessionStorage){if(key.indexOf("wp-autosave-")!=-1){sessionStorage.removeItem(key)}}}catch(e){}};</script>
			<?php
		}

		/**
		 * Enqueue scripts and styles for the login page.
		 *
		 * @since 3.1.0
		 */
		do_action( 'login_enqueue_scripts' );
		/**
		 * Fires in the login page header after scripts are enqueued.
		 *
		 * @since 2.1.0
		 */
		do_action( 'login_head' );

		if ( is_multisite() ) {
			$login_header_url   = network_home_url();
			$login_header_title = get_current_site()->site_name;
		} else {
			$login_header_url   = __( 'https://wordpress.org/' );
			$login_header_title = __( 'Powered by WordPress' );
		}

		/**
		 * Filter link URL of the header logo above login form.
		 *
		 * @since 2.1.0
		 *
		 * @param string $login_header_url Login header logo URL.
		 */
		$login_header_url = apply_filters( 'login_headerurl', $login_header_url );
		/**
		 * Filter the title attribute of the header logo above login form.
		 *
		 * @since 2.1.0
		 *
		 * @param string $login_header_title Login header logo title attribute.
		 */
		$login_header_title = apply_filters( 'login_headertitle', $login_header_title );

		$classes = array( 'login-action-' . $action, 'wp-core-ui' );
		if ( wp_is_mobile() )
			$classes[] = 'mobile';
		if ( is_rtl() )
			$classes[] = 'rtl';
		if ( $interim_login ) {
			$classes[] = 'interim-login';
			?>
			<style type="text/css">html{background-color: transparent;}</style>
			<?php

			if ( 'success' ===  $interim_login )
				$classes[] = 'interim-login-success';
		}
		$classes[] =' locale-' . sanitize_html_class( strtolower( str_replace( '_', '-', get_locale() ) ) );

		/**
		 * Filter the login page body classes.
		 *
		 * @since 3.5.0
		 *
		 * @param array  $classes An array of body classes.
		 * @param string $action  The action that brought the visitor to the login page.
		 */
		$classes = apply_filters( 'login_body_class', $classes, $action );

		?>
	</head>
	<body class="login <?php echo esc_attr( implode( ' ', $classes ) ); ?>">
	<div id="login">
		<h1><a href="<?php echo esc_url( $login_header_url ); ?>" title="<?php echo esc_attr( $login_header_title ); ?>" tabindex="-1"><?php bloginfo( 'name' ); ?></a></h1>
	<?php

	unset( $login_header_url, $login_header_title );

	/**
	 * Filter the message to display above the login form.
	 *
	 * @since 2.1.0
	 *
	 * @param string $message Login message text.
	 */
	$message = apply_filters( 'login_message', $message );
	if ( !empty( $message ) )
		echo $message . "\n";

	// In case a plugin uses $error rather than the $wp_errors object
	if ( !empty( $error ) ) {
		$wp_error->add('error', $error);
		unset($error);
	}

	if ( $wp_error->get_error_code() ) {
		$errors = '';
		$messages = '';
		foreach ( $wp_error->get_error_codes() as $code ) {
			$severity = $wp_error->get_error_data( $code );
			foreach ( $wp_error->get_error_messages( $code ) as $error_message ) {
				if ( 'message' == $severity )
					$messages .= '	' . $error_message . "<br />\n";
				else
					$errors .= '	' . $error_message . "<br />\n";
			}
		}
		if ( ! empty( $errors ) ) {
			/**
			 * Filter the error messages displayed above the login form.
			 *
			 * @since 2.1.0
			 *
			 * @param string $errors Login error message.
			 */
			echo '<div id="login_error">' . apply_filters( 'login_errors', $errors ) . "</div>\n";
		}
		if ( ! empty( $messages ) ) {
			/**
			 * Filter instructional messages displayed above the login form.
			 *
			 * @since 2.5.0
			 *
			 * @param string $messages Login messages.
			 */
			echo '<p class="message">' . apply_filters( 'login_messages', $messages ) . "</p>\n";
		}
	}
} // End of login_header()
