source: wp-accessibility/trunk/wp-accessibility.php

        }

        return $links;
}

add_action( 'wp_enqueue_scripts', 'wpa_stylesheet' );
/**
 * Enqueue stylesheets for WP Accessibility.
 */
function wpa_stylesheet() {
        $version = ( SCRIPT_DEBUG ) ? wp_rand( 10000, 100000 ) : wpa_check_version();
        wp_register_style( 'wpa-style', plugins_url( 'css/wpa-style.css', __FILE__ ), array(), $version );
        $ld = get_option( 'wpa_longdesc' );
        if ( 'link' === $ld || 'jquery' === $ld || 'button' === $ld || 'on' === get_option( 'asl_enable' ) || ! empty( get_option( 'wpa_post_types', array() ) ) ) {
                wp_enqueue_style( 'wpa-style' );
                // these styles are derived from the WordPress skip link defaults.
                $top = '7px';
                if ( is_admin_bar_showing() ) {
                        $top = '37px';
                }
                $add_css    = ( ! wpa_accessible_theme() ) ? wpa_css() : '';
                $custom_css = ':root { --admin-bar-top : ' . $top . '; }';
                wp_add_inline_style( 'wpa-style', wp_filter_nohtml_kses( wp_unslash( $add_css . $custom_css ) ) );
        }
        if ( current_user_can( 'edit_files' ) && 'on' === get_option( 'wpa_diagnostics' ) ) {
                wp_register_style( 'diagnostic', plugins_url( 'css/diagnostic.css', __FILE__ ) );
                wp_register_style( 'diagnostic-head', plugins_url( 'css/diagnostic-head.css', __FILE__ ) );
                wp_enqueue_style( 'diagnostic' );
                wp_enqueue_style( 'diagnostic-head' );
        }
}

add_action( 'admin_head', 'wpa_admin_stylesheet' );
/**
 * Enqueue admin stylesheets if enabled
 */
function wpa_admin_stylesheet() {
        // Used to provide an admin CSS from plug-in, now only enqueue if custom provided in theme.
        if ( file_exists( get_stylesheet_directory() . '/wp-admin.css' ) ) {
                $file = get_stylesheet_directory_uri() . '/wp-admin.css';
                wp_register_style( 'wp-a11y-css', $file );
                wp_enqueue_style( 'wp-a11y-css' );
        }
}

/**
 * Generate skiplink CSS.
 *
 * @param bool $defaults 'true' to return defaults regardless of settings.
 *
 * @return string
 */
function wpa_skiplink_css( $defaults = false ) {
        $use_defaults = get_option( 'asl_default_styles', '' );
        $styles       = '';
        $focus        = '';
        $passive      = '';
        $visibility   = ( 'on' === get_option( 'asl_visible' ) ) ? 'wpa-visible' : 'wpa-hide';
        $is_rtl       = ( is_rtl() ) ? '-rtl' : '-ltr';
        $off_vis      = ( 'on' === get_option( 'asl_visible' ) ) ? 'wpa-hide' : 'wpa-visible';
        $off_rtl      = ( is_rtl() ) ? '-ltr' : '-rtl';
        // If not using default styles.
        if ( 'true' !== $use_defaults && ! $defaults ) {
                $default_focus   = '';
                $default_passive = '';
                if ( '' !== get_option( 'asl_styles' ) ) {
                        $styles = wp_filter_nohtml_kses( get_option( 'asl_styles' ) );
                        // Ensure custom styles match settings.
                        $styles = str_replace( array( $off_vis, $off_rtl ), array( $visibility, $is_rtl ), $styles );
                        // If custom styles contain #skiplinks, we can just return this; it's probably a fully realized selector.
                        if ( false !== stripos( $styles, '#skiplinks' ) ) {
                                return $styles;
                        }
                } else {
                        $focus   = wp_filter_nohtml_kses( get_option( 'asl_styles_focus' ) );
                        $passive = wp_filter_nohtml_kses( get_option( 'asl_styles_passive' ) );
                }
        } else {
                // these styles are derived from the WordPress skip link defaults.
                $default_focus = 'background-color: #f1f1f1;
        box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
        color: #0073aa;
        display: block;
        font-weight: 600;
        height: auto;
        line-height: normal;
        padding: 15px 23px 14px;
        position: absolute;
        left: 6px;
        top: var(--admin-bar-top);
        text-decoration: none;
        text-transform: none;
        width: auto;
        z-index: 100000;';

                // Passive default styles derived from WordPress default focus styles.
                $default_passive = 'background-color: #fff;
        box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.2);
        color: #333;
        display: block;
        font-weight: 600;
        height: auto;
        line-height: normal;
        padding: 15px 23px 14px;
        position: absolute;
        left: 6px;
        top: var(--admin-bar-top);
        text-decoration: none;
        text-transform: none;
        width: auto;
        z-index: 100000;';
        }
        if ( is_admin() && '' !== $styles ) {
                return $styles;
        }

        if ( ! $focus ) {
                $focus = $default_focus;
        } else {
                $focus = $default_focus . $focus;
        }

        $vis   = '';
        $invis = '';
        $class = '.' . $visibility . $is_rtl;
        // If links are visible, "hover" is a focus style, otherwise, it's a passive style.
        if ( 'on' === get_option( 'asl_visible' ) ) {
                $vis     = $class . '#skiplinks a:hover,';
                $passive = $default_passive . $passive;
        } else {
                $invis   = $class . '#skiplinks a:hover,';
                $passive = '';
        }
        $styles .= "
$class#skiplinks a, $invis $class#skiplinks a:visited {
        $passive
}
$class#skiplinks a:active, $vis $class#skiplinks a:focus {
        $focus
}
        ";
        /**
         * Filter CSS styles output on front-end for skip links.
         *
         * @hook wpa_skiplink_styles
         *
         * @param {string} $styles Styles configured by settings.
         *
         * @return {string}
         */
        $styles = apply_filters( 'wpa_skiplink_styles', $styles );

        return $styles;
}

/**
 * Generate styles needed for WP Accessibility options.
 */
function wpa_css() {
        $styles = '';
        if ( get_option( 'asl_enable' ) === 'on' ) {
                $styles .= wpa_skiplink_css();
        }
        if ( 'on' === get_option( 'wpa_focus' ) ) {
                $color   = ( false !== (bool) get_option( 'wpa_focus_color' ) ) ? ' #' . get_option( 'wpa_focus_color' ) : '#233c7f';
                $styles .= "
                :focus { outline: 2px solid$color!important; outline-offset: 2px !important; }
                ";
        }

        return $styles;
}

/**
 * Test whether a URL is validly structured.
 *
 * @param string $url A purported URL.
 *
 * @return mixed URL if valid, false if not.
 */
function wpa_is_url( $url ) {
        return preg_match( '|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i', $url );
}

add_action( 'wp_enqueue_scripts', 'wpa_enqueue_js', 100 );
/**
 * Enqueue JS needed for WP Accessibility options.
 */
function wpa_enqueue_js() {
        $version    = ( SCRIPT_DEBUG ) ? wp_rand( 10000, 100000 ) : wpa_check_version();
        $visibility = ( 'on' === get_option( 'asl_visible' ) ) ? 'wpa-visible' : 'wpa-hide';
        $output     = '';
        if ( 'on' === get_option( 'asl_enable' ) && ! wpa_accessible_theme() ) {
                $html = '';
                /**
                 * Customize the default value for extra skiplink. Turns on extra skiplink options in WP Accessibility versions > 1.9.0.
                 *
                 * @hook asl_extra_target
                 * @param {string} Value to use as a default for the extra skiplink.
                 *
                 * @return {string}
                 */
                $default_extra = apply_filters( 'asl_extra_target', '' );
                $extra         = get_option( 'asl_extra_target', $default_extra );
                $extra         = ( wpa_is_url( $extra ) ) ? esc_url( $extra ) : str_replace( '#', '', esc_attr( $extra ) );
                if ( '' !== $extra && ! wpa_is_url( $extra ) ) {
                        $extra = "#$extra";
                }
                $extra_text = (string) stripslashes( get_option( 'asl_extra_text' ) );
                $content    = str_replace( '#', '', esc_attr( get_option( 'asl_content' ) ) );
                $nav        = str_replace( '#', '', esc_attr( get_option( 'asl_navigation' ) ) );
                /**
                 * Customize the default value for sitemap skiplink. Turns on sitemap skiplink options in WP Accessibility versions > 1.9.0.
                 *
                 * @hook asl_sitemap
                 * @param {string} Value to use as a default for the sitemap.
                 *
                 * @return {string}
                 */
                $default_sitemap = apply_filters( 'asl_sitemap', '' );
                $sitemap         = esc_url( get_option( 'asl_sitemap', $default_sitemap ) );
                $html           .= ( '' !== $content ) ? "<a href=\"#$content\" class='no-scroll et_smooth_scroll_disabled'>" . __( 'Skip to Content', 'wp-accessibility' ) . '</a> ' : '';
                $html           .= ( '' !== $nav ) ? "<a href=\"#$nav\" class='no-scroll et_smooth_scroll_disabled'>" . __( 'Skip to navigation', 'wp-accessibility' ) . '</a> ' : '';
                $html           .= ( '' !== $sitemap ) ? "<a href=\"$sitemap\" class='no-scroll et_smooth_scroll_disabled'>" . __( 'Site map', 'wp-accessibility' ) . '</a> ' : '';
                $html           .= ( '' !== $extra && '' !== $extra_text ) ? "<a href=\"$extra\" class='no-scroll et_smooth_scroll_disabled'>$extra_text</a> " : '';
                $is_rtl          = ( is_rtl() ) ? '-rtl' : '-ltr';
                $skiplinks       = __( 'Skip links', 'wp-accessibility' );
                $output          = ( '' !== $html ) ? "<div class=\"$visibility$is_rtl\" id=\"skiplinks\" role=\"navigation\" aria-label=\"" . esc_attr( $skiplinks ) . "\">$html</div>" : '';
        }

        $labels = array(
                's'       => _x( 'Search', 'Search field label', 'wp-accessibility' ),
                'author'  => _x( 'Name', 'Commenter name label', 'wp-accessibility' ),
                'email'   => _x( 'Email', 'Commenter email label', 'wp-accessibility' ),
                'url'     => _x( 'Website', 'Commenter website label', 'wp-accessibility' ),
                'comment' => _x( 'Comment', 'Commenter message label', 'wp-accessibility' ),
        );
        /**
         * Customize labels passed to automatically label core WordPress fields.
         *
         * @hook wpa_labels
         * @param {array} $labels Array of labels for search and comment fields.
         *
         * @return {array}
         */
        $labels = apply_filters( 'wpa_labels', $labels );
        $dir    = '';
        $lang   = '';
        if ( 'off' !== get_option( 'wpa_lang_attributes' ) && ! wpa_accessible_theme() ) {
                $dir  = ( is_rtl() ) ? 'rtl' : 'ltr';
                $lang = get_bloginfo( 'language' );
        }

        if ( SCRIPT_DEBUG ) {
                $wpajs = plugins_url( 'js/wp-accessibility.js', __FILE__ );
        } else {
                $wpajs = plugins_url( 'js/wp-accessibility.min.js', __FILE__ );
        }
        wp_enqueue_script(
                'wp-accessibility',
                $wpajs,
                array(),
                $version,
                array(
                        'in_footer' => true,
                        'strategy'  => 'defer',
                )
        );

        $longdesc_type = false;
        if ( 'link' === get_option( 'wpa_longdesc' ) ) {
                $longdesc_type = 'link';
        } elseif ( 'jquery' === get_option( 'wpa_longdesc' ) || 'button' === get_option( 'wpa_longdesc' ) ) {
                $longdesc_type = 'button';
        }
        /**
         * Modify the selector used to attach the alt attribute toggle button on images. Default `.hentry img[alt!=""], .comment-content img[alt!=""]`.
         *
         * @hook wpa_show_alt_selector
         *
         * @since 2.0.0
         *
         * @param {string} $selector Valid CSS selector string.
         *
         * @return {string}
         */
        $selector = apply_filters( 'wpa_show_alt_selector', '.hentry img[alt]:not([alt=""]), .comment-content img[alt]:not([alt=""]), #content img[alt]:not([alt=""]),.entry-content img[alt]:not([alt=""])' );
        $alttext  = ( 'on' === get_option( 'wpa_show_alt' ) ) ? true : false;

        /**
         * Filter target element selector for underlines. Default `a`.
         *
         * @hook wpa_underline_target
         *
         * @param {string} $el Target element selector.
         *
         * @return string
         */
        $target = apply_filters( 'wpa_underline_target', 'a' );
        /**
         * Filter whether console log messages about remediation actions will be sent.
         *
         * @hook wpa_view_remediation_logs
         *
         * @param {bool} $visible Default `true` if user is logged in and has capabilities to manage options.
         *
         * @return {bool}
         */
        $errors_enabled = apply_filters( 'wpa_view_remediation_logs', current_user_can( 'manage_options' ) );
        $track          = ( '' === get_option( 'wpa_track_stats', '' ) ) ? current_user_can( 'manage_options' ) : true;
        $track          = ( 'off' === get_option( 'wpa_track_stats' ) ) ? false : $track;
        /**
         * Filter whether data from views will be tracked.
         *
         * @hook wpa_track_view_statistics
         *
         * @param {bool} $visible Default `true` if user is logged in and has capabilities to manage options or if enabled in settings.
         *
         * @return {bool}
         */
        $tracking_enabled = apply_filters( 'wpa_track_view_statistics', $track );
        $apply_labels     = ( 'off' === get_option( 'wpa_labels' ) ) ? false : true;
        /**
         * Filter whether automatic labeling is enabled.
         *
         * @hook wpa_disable_labels
         *
         * @param {bool} $enabled True if labels are automatically added.
         *
         * @return {bool}
         */
        $apply_labels  = apply_filters( 'wpa_disable_labels', $apply_labels );
        $remove_titles = ( 'off' === get_option( 'wpa_remove_titles' ) ) ? false : true;
        /**
         * Filter whether title attributes are removed. Used to be image titles only, now applies buttons and links, as well.
         *
         * @hook wpa_remove_titles
         *
         * @param {bool} $enabled True if title attributes are removed.
         *
         * @return {bool}
         */
        $remove_titles = apply_filters( 'wpa_remove_titles', $remove_titles );
        $set_viewport  = ( 'off' === get_option( 'wpa_viewport' ) ) ? false : true;
        /**
         * Filter whether WP Accessibility manipulates the viewport.
         *
         * @hook wpa_viewport
         *
         * @param {bool} $enabled True viewport can be modified.
         *
         * @return {bool}
         */
        $viewport = apply_filters( 'wpa_viewport', $set_viewport );
        wp_localize_script(
                'wp-accessibility',
                'wpa',
                array(
                        'skiplinks'   => array(
                                'enabled' => ( 'on' === get_option( 'asl_enable' ) ) ? true : false,
                                'output'  => $output,
                        ),
                        'target'      => ( 'on' === get_option( 'wpa_target' ) ) ? true : false,
                        'tabindex'    => ( 'on' === get_option( 'wpa_tabindex' ) ) ? true : false,
                        'underline'   => array(
                                'enabled' => ( 'on' === get_option( 'wpa_underline' ) ) ? true : false,
                                'target'  => $target,
                        ),
                        'videos'      => ( 'on' === get_option( 'wpa_videos' ) ) ? true : false,
                        'dir'         => $dir,
                        'viewport'    => $viewport,
                        'lang'        => $lang,
                        'titles'      => $remove_titles,
                        'labels'      => $apply_labels,
                        'wpalabels'   => $labels,
                        'alt'         => $alttext,
                        'altSelector' => $selector,
                        'current'     => ( version_compare( $GLOBALS['wp_version'], '5.3', '<' ) ) ? true : false,
                        'errors'      => ( $errors_enabled ) ? true : false,
                        'tracking'    => ( $tracking_enabled ) ? true : false,
                        'ajaxurl'     => admin_url( 'admin-ajax.php' ),
                        'security'    => wp_create_nonce( 'wpa-stats-action' ),
                        'action'      => 'wpa_stats_action',
                        'url'         => ( function_exists( 'wpa_get_current_url' ) ) ? wpa_get_current_url() : 'disabled',
                        'post_id'     => ( is_singular() ) ? get_the_ID() : '',
                        'continue'    => ( wp_is_block_theme() ) ? true : false,
                        'pause'       => __( 'Pause video', 'wp-accessibility' ),
                        'play'        => __( 'Play video', 'wp-accessibility' ),
                        'restUrl'     => get_rest_url( null, 'wp/v2/media' ),
                        'ldType'      => $longdesc_type,
                        'ldHome'      => home_url(),
                        'ldText'      => '<span class="dashicons dashicons-media-text" aria-hidden="true"></span><span class="screen-reader">' . __( 'Long Description', 'wp-accessibility' ) . '</span>',
                )
        );
}

// courtesy of Graham Armfield (modified).
add_action( 'admin_bar_menu', 'wpa_logout_item', 11 );
/**
 * Add adminbar menu logout.
 *
 * @link http://www.coolfields.co.uk/2013/02/wordpress-permanently-visible-log-out-link-plugin-version-0-1/
 * @param object $admin_bar Admin bar object.
 */
function wpa_logout_item( $admin_bar ) {
        if ( ! is_user_logged_in() || 'on' === get_option( 'wpa_disable_logout', 'true' ) ) {
                return;
        }

        $args = array(
                'id'    => 'wpa-logout',
                'title' => __( 'Log Out', 'wp-accessibility' ),
                'href'  => wp_logout_url(),
        );
        $admin_bar->add_node( $args );
}

add_filter( 'posts_clauses', 'wpa_search_attachment_alt', 20, 2 );
/**
 * Allow users to search alt attributes in the media library.
 *
 * @param array  $clauses WordPress post query clauses.
 * @param object $query WordPress query object.
 *
 * @return array
 */
function wpa_search_attachment_alt( $clauses, $query ) {
        if ( is_admin() && 'on' === get_option( 'wpa_search_alt' ) ) {
                global $wpdb;
                if ( isset( $query->query['post_type'] ) && 'attachment' === $query->query['post_type'] && '' !== $query->query_vars['s'] ) {
                        $clauses['join'] = " LEFT JOIN {$wpdb->postmeta} AS sq1 ON ( {$wpdb->posts}.ID = sq1.post_id AND ( sq1.meta_key = '_wp_attached_file' OR sq1.meta_key = '_wp_attachment_image_alt' ) )";
                }
        }

        return $clauses;
}

add_filter( 'mce_css', 'wpa_diagnostic_css' );
/**
 * Add diagnostic CSS.
 *
 * @param string $mce_css Existing CSS.
 *
 * @return full string css.
 */
function wpa_diagnostic_css( $mce_css ) {
        if ( get_option( 'wpa_diagnostics' ) === 'on' ) {
                $mce_css .= ', ' . plugins_url( 'css/diagnostic.css', __FILE__ );
        }

        return $mce_css;
}

if ( 'on' === get_option( 'wpa_search' ) ) {
        add_filter( 'pre_get_posts', 'wpa_filter' );
}

/**
 * Filter search queries to ensure that an error page is returned if no results.
 *
 * @param object $query Main WP_Query object.
 *
 * @return $query.
 */
function wpa_filter( $query ) {
        if ( ! is_admin() ) {
                if ( isset( $_GET['s'] ) && '' === trim( $_GET['s'] ) && ( $query->is_main_query() ) ) {
                        $query->query_vars['s'] = '&#32;';
                        $query->set( 'is_search', 1 );
                        add_action( 'template_include', 'wpa_search_error' );
                        add_filter(
                                'get_search_query',
                                function ( $search_query ) {
                                        if ( '&#32;' === $search_query ) {
                                                return '';
                                        }
                                        return $search_query;
                                }
                        );
                }
        }

        return $query;
}

/**
 * Locate template for the search error page.
 *
 * @param string $template Current template name.
 *
 * @return string New template name if changed.
 */
function wpa_search_error( $template ) {
        $search = locate_template( 'search.php' );
        if ( $search ) {
                return $search;
        }

        return $template;
}

if ( 'on' === get_option( 'wpa_more' ) && ! wpa_accessible_theme() ) {
        add_filter(
                'body_class',
                function ( $classes ) {
                        return array_merge( $classes, array( 'wpa-excerpt' ) );
                }
        );
        add_filter( 'get_the_excerpt', 'wpa_custom_excerpt_more', 100 );
        add_filter( 'excerpt_more', 'wpa_excerpt_more', 100 );
        add_filter( 'the_content_more_link', 'wpa_content_more', 100 );
}

/**
 * Custom "Continue Reading" with post title context.
 *
 * @param int $id Post ID.
 *
 * @return string HTML link & text.
 */
function wpa_continue_reading( $id ) {
        return '<a class="continue" href="' . esc_url( get_permalink( $id ) ) . '">' . get_option( 'wpa_continue' ) . '<span> ' . get_the_title( $id ) . '</span></a>';
}

/**
 * Add custom continue reading text to excerpts.
 *
 * @return string Ellipsis + continue reading text.
 */
function wpa_excerpt_more() {
        global $id;

        return '&hellip; ' . wpa_continue_reading( $id );
}

/**
 * Add custom continue reading text to content.
 *
 * @return continue reading text.
 */
function wpa_content_more() {
        global $id;

        return wpa_continue_reading( $id );
}

/**
 * Add custom continue reading text to custom excerpts.
 *
 * @param string $output Existing content.
 *
 * @return continue reading text.
 */
function wpa_custom_excerpt_more( $output ) {
        if ( has_excerpt() && ! is_attachment() ) {
                global $id;
                $output .= ' ' . wpa_continue_reading( $id ); // insert a blank space.
        }

        return $output;
}

/**
 * Create support form.
 */
function wpa_get_support_form() {
        global $current_user;
        $current_user = wp_get_current_user();
        $request      = '';
        $version      = wpa_check_version();
        // send fields for all plugins.
        $wp_version = get_bloginfo( 'version' );
        $home_url   = home_url();
        $wp_url     = site_url();
        $language   = get_bloginfo( 'language' );
        $charset    = get_bloginfo( 'charset' );
        // server.
        $php_version = phpversion();

        // theme data.
        $theme         = wp_get_theme();
        $theme_name    = $theme->get( 'Name' );
        $theme_uri     = $theme->get( 'ThemeURI' );
        $theme_parent  = $theme->get( 'Template' );
        $theme_parent  = ( $theme_parent ) ? $theme_parent : __( 'None', 'wp-accessibility' );
        $theme_version = $theme->get( 'Version' );

        // plugin data.
        $plugins        = get_plugins();
        $plugins_string = '';
        foreach ( array_keys( $plugins ) as $key ) {
                if ( is_plugin_active( $key ) ) {
                        $plugin          =& $plugins[ $key ];
                        $plugin_name     = $plugin['Name'];
                        $plugin_uri      = $plugin['PluginURI'];
                        $plugin_version  = $plugin['Version'];
                        $plugins_string .= "$plugin_name: $plugin_version; $plugin_uri\n";
                }
        }
        $data = "
================ Installation Data ====================
==WP Accessibility==
Version: $version

==WordPress:==
Version: $wp_version
URL: $home_url
Install: $wp_url
Language: $language
Charset: $charset
Admin Email: $current_user->user_email

==Extra info:==
PHP Version: $php_version
Server Software: $_SERVER[SERVER_SOFTWARE]
User Agent: $_SERVER[HTTP_USER_AGENT]

==Theme:==
Name: $theme_name
URI: $theme_uri
Parent: $theme_parent
Version: $theme_version

==Active Plugins:==
$plugins_string
";
        if ( isset( $_POST['wpa_support'] ) ) {
                $nonce = $_REQUEST['_wpnonce'];
                if ( ! wp_verify_nonce( $nonce, 'wpa-nonce' ) ) {
                        wp_die( 'WP Accessibility: Security check failed' );
                }
                $request     = ( ! empty( $_POST['support_request'] ) ) ? sanitize_textarea_field( wp_unslash( $_POST['support_request'] ) ) : false;
                $has_donated = ( 'on' === $_POST['has_donated'] ) ? 'Donor' : 'No donation';
                $subject     = "WP Accessibility support request. $has_donated";
                $message     = $request . "\n\n" . $data;
                // Get the site domain and get rid of www. from pluggable.php.
                $sitename = sanitize_text_field( strtolower( $_SERVER['SERVER_NAME'] ) );
                if ( 'www.' === substr( $sitename, 0, 4 ) ) {
                        $sitename = substr( $sitename, 4 );
                }
                $from_email = 'wordpress@' . $sitename;
                $from       = "From: $current_user->display_name <$from_email>\r\nReply-to: $current_user->display_name <$current_user->user_email>\r\n";

                if ( ! $request ) {
                        echo "<div class='message error'><p>" . esc_html__( 'Please describe your problem.', 'wp-accessibility' ) . '</p></div>';
                } else {
                        wp_mail( 'plugins@joedolson.com', $subject, $message, $from );
                        if ( 'Donor' === $has_donated ) {
                                echo "<div class='message updated'><p>" . esc_html__( 'Thank you for supporting the continuing development of this plug-in! I\'ll get back to you as soon as I can.', 'wp-accessibility' ) . '</p></div>';
                        } else {
                                echo "<div class='message updated'><p>" . esc_html__( 'I cannot provide support, but will treat your request as a bug report, and will incorporate any permanent solutions I discover into the plug-in.', 'wp-accessibility' ) . '</p></div>';
                        }
                }
        }
        $admin_url = admin_url( 'admin.php?page=wp-accessibility' );

        echo "
        <form method='post' action='" . esc_url( $admin_url ) . "'>
                <div><input type='hidden' name='_wpnonce' value='" . wp_create_nonce( 'wpa-nonce' ) . "' /></div>
                <div>";
        echo '
                <p>
                <code>' . __( 'From:', 'wp-accessibility' ) . " \"$current_user->display_name\" &lt;$current_user->user_email&gt;</code>
                </p>
                <p>
                <input type='checkbox' name='has_donated' id='has_donated' value='on' /> <label for='has_donated'>";
                // Translators: Donation URL.
        echo sprintf( __( 'I <a href="%s">made a donation</a> to help support this plugin', 'wp-accessibility' ), 'https://www.joedolson.com/donate/' ) . "</label>
                </p>
                <p>
                <label for='support_request'>" . __( 'Support Request:', 'wp-accessibility' ) . "</label><br /><textarea name='support_request' required id='support_request' cols='80' rows='10' class='widefat'>" . esc_textarea( stripslashes( $request ) ) . "</textarea>
                </p>
                <p>
                <input type='submit' value='" . __( 'Send Support Request', 'wp-accessibility' ) . "' name='wpa_support' class='button-primary' />
                </p>
                <p>" . __( 'The following additional information will be sent with your support request:', 'wp-accessibility' ) . "</p>
                <div class='wpa_support'>
                " . wpautop( $data ) . '
                </div>
                </div>
        </form>';
}

/**
 * Tests whether the current theme is labeled accessibility-ready
 *
 * @return boolean True if this theme has the tag 'accessibility-ready'.
 */
function wpa_accessible_theme() {
        // This is Oxygen Builder, and the active theme test is invalid.
        if ( defined( 'CT_VERSION' ) ) {
                return false;
        }
        $theme = wp_get_theme();
        $tags  = $theme->get( 'Tags' );
        if ( is_array( $tags ) && in_array( 'accessibility-ready', $tags, true ) ) {
                return true;
        }
        return false;
}

/**
 * Disable full screen block editor by default.
 */
function wpa_disable_editor_fullscreen_by_default() {
        if ( 'on' === get_option( 'wpa_disable_fullscreen' ) ) {
                $script = "window.onload = function() { const isFullscreenMode = wp.data.select( 'core/edit-post' ).isFeatureActive( 'fullscreenMode' ); if ( isFullscreenMode ) { wp.data.dispatch( 'core/edit-post' ).toggleFeature( 'fullscreenMode' ); } }";
                wp_add_inline_script( 'wp-blocks', $script );
        }
}
add_action( 'enqueue_block_editor_assets', 'wpa_disable_editor_fullscreen_by_default' );

/**
 * Disable file embeds by default.
 *
 * @param array $blockdata Array of block configuration meta data.
 *
 * @return array
 */
function wpa_disable_file_embed_by_default( $blockdata ) {
        if ( 'core/file' === $blockdata['name'] && 'on' === get_option( 'wpa_disable_file_embed' ) ) {
                if ( isset( $blockdata['attributes']['displayPreview'] ) ) {
                        $blockdata['attributes']['displayPreview']['default'] = false;
                }
        }

        return $blockdata;
}
add_filter( 'block_type_metadata', 'wpa_disable_file_embed_by_default' );

/**
 * Remove the H1 heading from the headings block.
 *
 * @param array  $args Block type arguments array.
 * @param string $block_type Block type declaration.
 *
 * @return array
 */
function wpa_remove_h1( $args, $block_type ) {
        // The H1 is not allowed by default.
        $allowed = get_option( 'wpa_allow_h1', '' );
        if ( 'on' !== $allowed ) {
                // Only proceed if the current block is a Heading.
                if ( 'core/heading' !== $block_type ) {
                        return $args;
                }

                // Declare valid heading levels.
                $args['attributes']['levelOptions']['default'] = array( 2, 3, 4, 5, 6 );
        }
        return $args;
}
add_filter( 'register_block_type_args', 'wpa_remove_h1', 10, 2 );

/**
 * Insert content summary at top of article content.
 *
 * @param string $content Post content.
 *
 * @return string
 */
function wpa_content_summary( $content ) {
        if ( is_singular() && wpa_in_post_type( get_queried_object_id() ) ) {
                $post_id = get_the_ID();
                $summary = wpa_get_content_summary( $post_id );
                if ( ! $summary ) {
                        return $content;
                }
                $content = $summary . $content;
        }

        return $content;
}
add_filter( 'the_content', 'wpa_content_summary' );

/**
 * Get a simplified summary for content.
 *
 * @param int $post_id Post ID.
 *
 * @return string
 */
function wpa_get_content_summary( $post_id ) {
        $summary = trim( get_post_meta( $post_id, '_wpa_content_summary', true ) );
        if ( ! $summary ) {
                return '';
        }
        /**
         * Filter the heading text for content summaries. Default `Summary`.
         *
         * @hook wpa_summary_heading
         *
         * @param {string} $heading Heading text.
         * @param {int}    $post_id Post ID.
         *
         * @return {string}
         */
        $heading = apply_filters( 'wpa_summary_heading', __( 'Summary', 'wp-accessibility' ), $post_id );
        /**
         * Filter the heading level for content summaries. Default `h2`.
         *
         * @hook wpa_summary_heading_level
         *
         * @param {string} $heading Element selector.
         * @param {int}    $post_id Post ID.
         *
         * @return {string}
         */
        $level = apply_filters( 'wpa_summary_heading_level', 'h2', $post_id );

        $heading = "<$level>" . $heading . "</$level>";
        $content = '<section class="wpa-content-summary" id="summary-' . absint( $post_id ) . '"><div class="wpa-content-summary-inner">' . $heading . wpautop( wp_kses_post( stripslashes( $summary ) ) ) . '</div></section>';

        return $content;
}

/**
 * Check whether a given post is in an allowed post type for content summaries.
 *
 * @param integer $post_id Post ID.
 *
 * @return boolean True if post is allowed, false otherwise.
 */
function wpa_in_post_type( $post_id ) {
        $settings = get_option( 'wpa_post_types', array() );
        if ( is_array( $settings ) && ! empty( $settings ) ) {
                $type = get_post_type( $post_id );
                if ( in_array( $type, $settings, true ) ) {
                        return true;
                }
        }

        return false;
}

add_action( 'admin_menu', 'wpa_add_outer_box' );
/**
 * Add metabox for content summaries.
 */
function wpa_add_outer_box() {
        $allowed = get_option( 'wpa_post_types', array() );
        if ( is_array( $allowed ) ) {
                foreach ( $allowed as $post_type ) {
                        add_meta_box( 'wpa_content_summary_container', __( 'Content Summary', 'wp-accessibility' ), 'wpa_add_inner_box', $post_type, 'normal', 'high' );
                }
        }
}

/**
 * Render content summary form.
 */
function wpa_add_inner_box() {
        global $post;
        $summary = get_post_meta( $post->ID, '_wpa_content_summary', true );
        $nonce   = wp_nonce_field( 'wpa-nonce-field', 'wpa_nonce_name', true, false );
        echo $nonce;
        ?>
        <p class='wpa-content-summary-field'>
                <label for="wpa_content_summary"><?php _e( 'Simple Content Summary', 'wp-accessibility' ); ?></label><br/>
                <textarea class="wpa-content-summary widefat" name="wpa_content_summary" id="wpa_content_summary" rows="4" cols="60" aria-describedy="content-summary-description"><?php echo esc_textarea( $summary ); ?></textarea>
                <span id="content-summary-description"><?php _e( 'Provide a simplified summary to aid comprehension of complex content.', 'wp-accessibility' ); ?></span>
        </p>
        <?php
}

/**
 * Save content summary from post meta box.
 *
 * @param int    $id Post ID.
 * @param object $post Post.
 *
 * @return int
 */
function wpa_save_content_summary( $id, $post ) {
        if ( empty( $_POST ) || ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) || wp_is_post_revision( $id ) || isset( $_POST['_inline_edit'] ) || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) || ! wpa_in_post_type( $id ) ) {
                return $id;
        }

        // verify this came from our screen and with proper authorization.
        // because save_post can be triggered at other times.
        if ( isset( $_POST['wpa_nonce_name'] ) ) {
                if ( ! wp_verify_nonce( $_POST['wpa_nonce_name'], 'wpa-nonce-field' ) ) {
                        return $id;
                }
                $summary = isset( $_POST['wpa_content_summary'] ) ? wp_kses_post( $_POST['wpa_content_summary'] ) : '';
                update_post_meta( $id, '_wpa_content_summary', $summary );
        }

        return $id;
}
add_action( 'save_post', 'wpa_save_content_summary', 10, 2 );