WordPress mu plugin to disable APIs in WordPress header

wp-plugin-disable-apis.php

<?php
/***
Plugin Name: disable APIs
Plugin URI: https://gist.github.com/onecooltaco/87e7462e7abb3fd06bfc58730281f5f4
Description: Disable APIs in WordPress header
Version: 1.0.0
Author: Jeremy Leggat
***/

/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2, as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

// Remove Head API
remove_action('wp_head', 'rest_output_link_wp_head');
remove_action('wp_head', 'wp_oembed_add_discovery_links');
remove_action('template_redirect', 'rest_output_link_header', 11);

/** Disable REST API **/
// Filters for WP-API version 1.x
add_filter('json_enabled', '__return_false');
add_filter('json_jsonp_enabled', '__return_false');

// Filters for WP-API version 2.x
// add_filter('rest_enabled', '__return_false');
add_filter('rest_jsonp_enabled', '__return_false');

// More REST API Hooks
remove_action('rest_api_init', 'wp_oembed_register_route'); // Remove the REST API endpoint.

/** Disable Heartbeat API **/
add_action( 'init', 'oct_disable_apis_stop_heartbeat', 1 );
function oct_disable_apis_stop_heartbeat() {
    wp_deregister_script('heartbeat');
}

// Remove WordPress Version Number
remove_action('wp_head', 'wp_generator'); // Remove WordPress Generator Version
add_filter('the_generator', '__return_false'); // Remove Generator Name From Rss Feeds.

// Remove Feeds
remove_action('wp_head', 'feed_links_extra', 3); // Remove Every Extra Links to Rss Feeds.
remove_action('wp_head', 'feed_links', 2);
remove_action('wp_head', 'wc_products_rss_feed');

/* Disable Self Pings */
add_action('pre_ping', 'oct_disable_apis_no_self_ping');
function oct_disable_apis_no_self_ping(&$links)
{
    $home = get_option('home');

    foreach ($links as $l => $link)

        if (0 === strpos($link, $home))

            unset($links[$l]);
}

// Remove Link shortlink from http
remove_action('template_redirect', 'wp_shortlink_header', 11);
remove_action('wp_head', 'wp_shortlink_wp_head', 10, 0);

// Remove X-Pingback
add_filter('wp_headers', 'oct_disable_apis_remove_pingback_head');
add_action('wp', 'oct_disable_apis_remove_pingback');
function oct_disable_apis_remove_pingback_head($headers)
{
    if (isset($headers['X-Pingback'])) {
        unset($headers['X-Pingback']);
    }
    return $headers;
}

function oct_disable_apis_remove_pingback()
{
    if (function_exists('header_remove')) {
        header_remove('X-Pingback');
    }
}

// Remove date archives
add_action('template_redirect', 'oct_disable_apis_remove_archives_date');
function oct_disable_apis_remove_archives_date()
{
    if (is_date()){
        $target = get_option('siteurl');
        $status = '301';
        wp_redirect($target, 301);
        die();
    }
}

// Remove Author archives
add_action('template_redirect', 'oct_disable_apis_remove_archives_author');
function oct_disable_apis_remove_archives_author()
{
    if (is_author()){
        $target = get_option('siteurl');
        $status = '301';
        wp_redirect($target, 301);
        die();
    }
}

// Remove tag archives
add_action('template_redirect', 'oct_disable_apis_remove_archives_tag');
function oct_disable_apis_remove_archives_tag()
{
    if (is_tag()){
        $target = get_option('siteurl');
        $status = '301';
        wp_redirect($target, 301);
        die();
    }
}

// Remove category archives
add_action('template_redirect', 'oct_disable_apis_remove_archives_category');
function oct_disable_apis_remove_archives_category()
{
    if (is_category()){
        $target = get_option('siteurl');
        $status = '301';
        wp_redirect($target, 301);
        die();
    }
}

// Remove Link to Home Page.
remove_action('wp_head', 'index_rel_link');

// REMOVE wlwmanifest.xml.
remove_action('wp_head', 'wlwmanifest_link');

// Remove Really Simple Discovery Link
remove_action('wp_head', 'rsd_link');

/** Remove Canonical URL **/
remove_action('wp_head', 'rel_canonical');
add_filter('wpseo_canonical', '__return_false');

// Remove Prev/Next Link from Head
remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10); // Remove Prev-next Links From Header -not From Post-.
remove_action('wp_head', 'adjacent_posts_rel_link', 10, 0); // Remove Prev-next Links.
remove_action('wp_head', 'start_post_rel_link', 10, 0); // Remove Random Link Post.
remove_action('wp_head', 'parent_post_rel_link', 10, 0); // Remove Parent Post Link.

// Disable XML-RPC
add_action('wp_default_scripts', 'oct_disable_apis_disable_xmlrpc', 9999);
function oct_disable_apis_disable_xmlrpc()
{
    add_filter('xmlrpc_enabled', '__return_false');
}

// Remove search page
add_action('template_redirect', 'oct_disable_apis_remove_archives_search');
function oct_disable_apis_remove_archives_search()
{
    if (is_search()){
        $target = get_option('siteurl');
        $status = '301';
        wp_redirect($target, 301);
        die();
    }
}

/** Remove Version Query Strings from Scripts/Styles **/
add_filter('script_loader_src', 'oct_disable_apis_remove_script_version', 15, 1);
add_filter('style_loader_src', 'oct_disable_apis_remove_script_version', 15, 1);

/** Remove Query Strings from Scripts/Styles **/
function oct_disable_apis_remove_script_version($src)
{
    $parts = explode('?ver', $src);
    return $parts[0];
}

remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
remove_action( 'wp_print_styles', 'print_emoji_styles' );