Eu configurei um multisite de rede enorme para o meu cliente, que recebe milhares de novos usuários por mês e já possui 5 sites de rede clonados e conta. Ele possui uma home page estática com o plugin Theme-my-login executando em um filho Divi personalizado tema.

Na página de login personalizada, há o próprio login, que funciona bem, e abaixo desses dois "links de ação" para "Register" e "Lost Password". Eu tenho duas páginas personalizadas externas para vincular nos dois links.

Então, edito o arquivo functions.php do tema filho, que já possui alguns filtros de trabalho para lidar com autenticação externa, vídeo (popcorn.js), direitos autorais dinâmicos e ocultar o logotipo do Wordpress na barra de administração.

Eu queria alterar os "links de ação" de Registro / Senha perdida padrão para URLs diferentes, alterar os títulos dos links e Modificar as páginas de Erro para que "Senha perdida?" O link levaria ao mesmo URL que o "link de ação" da Senha perdida.

Abaixo está o arquivo Functions.php antes das alterações necessárias acima:

<?php

/*
PHP script content in functions.php of Child Theme in Wordpress Network 
Multisite.

Functions to add new externally authenticated users as wordpress users 
at subscriber level via email field using HTTP POST. 

Usernames expected in the format: [email protected] or [email protected] 
(also all variations of .com.au, .co.nz, etc.) 

New Wordpress Network MultiSite Subfolders are assigned to their own groups of users. 

On login their WordPress profile is automatically created in the MultiSite 
Subfolder for that user; based on the DOMAIN portion of username/email.
Accordingly, Wordpress Network Subfolder names match the DOMAIN exactly. 

eg: "http://wpsite.com/DOMAIN/Home" is the landing page for the user: 
    "[email protected]" or "[email protected]" and so on.

The Logic flow is below annotated and step by step along with the script:

1.Do the external check: The external login must be successful and the return 
  value must be validated with a "200" response from the external auth' server. 

If response is anything else give an error.

2.Do another check to see if they exist in the WP DB, if not; create them
  first (EVERY user in WordPress has a unique ID, so using this ID to identify a user in this script.) 

If the ID is found, our user is automatically logged in 
and lands on their home page.

If the user does NOT exist, the user should be created automatically on the
relevant subfolder site (see notes ablove)
*/

// PHP code starts here:

// The two lines of filters below are executed just before the invocation of the 
// WordPress authentication process.
add_filter( 'authenticate', 'external_auth', 10, 3 );
add_filter( 'login_redirect', 'ds_login_redirect', 10, 3 );

function external_auth( $user, $username, $password ){

    // Make sure a username and password are present for us to work with
    if($username == '' || $password == '') return;    

    // Try to log into the external service or database with username and password
    $args = array(
        'method' => 'POST',
        'timeout' => 45,
        'redirection' => 5,
        'httpversion' => '1.0',
        'blocking' => true,
        'headers' => array(),
        'body' => array( 'username' => $username, 'password' => $password ),
        'cookies' => array()
        );

    $ext_auth = wp_remote_post("http://IP.OF.EXTERNAL.AUTH:SERVER/api-token-auth/",$args);

    // If external authentication was successful
    if($ext_auth['response']['code'] == 200) {

        $userobj = new WP_User();
        $user = $userobj->get_data_by( 'login', $username ); 
        // Does not return a WP_User object :(
        $user = new WP_User($user->ID); 
        // Attempt to load up the user with that ID

        if( $user->ID == 0 ) {
                // The user does not currently exist in the WordPress user table.

                // If you don't want to add new users to WordPress when they don't already 
                // exist; uncomment the following line and remove the create WP user code
                //$user = new WP_Error( 'denied', __("ERROR: Not a valid user for this system") );

                // Setup minimum required user information and create WP user
                $new_user_id =  wpmu_create_user($username, $password, $username); 
                                // A new user has been created

                                // Match DOMAIN in username/email to WordPress Subfolder and add permission to relevent blog 
                $domain_end = explode('@', $username);
                //var_dump($domain_end);
                $match = explode('.', $domain_end[1]);
                //var_dump($match);


                $domain = 'YOUR_DOMAIN.com';
                foreach ($match as $blog_key){
                    $path = '/'.$blog_key.'/';
                    $blog_id = get_blog_id_from_url ( $domain, $path );
                    if ($blog_id != 0) break;
                }       

                //Specify their role 
                $role = 'subscriber';

                // Give the user access to their blog.
                add_user_to_blog($blog_id, $new_user_id, $role);

                // Load the new user info
                $user = new WP_User ($new_user_id);
        } 

    }else if($ext_auth['response']['code'] == 400){
        $user = new WP_Error( 'denied', __("ERROR: User/pass bad") );
    }

    // Comment below line to fall back to WordPress authentication
    // (in case external service offline for maintenance)
    remove_action('authenticate', 'wp_authenticate_username_password', 20);

    return $user;   
}

function ds_login_redirect( $redirect_to, $request_redirect_to, $user )
{
    if ($user->ID != 0) {
        $user_info = get_userdata($user->ID);
        if ($user_info->primary_blog) {
            $primary_url = get_blogaddress_by_id($user_info->primary_blog) . 'index/';
            if ($primary_url) {
                //echo $primary_url; die();
                wp_redirect($primary_url);
                die();
            }
        }
    }

    return $redirect_to;
}

/* Include popcorn.js --------------------- */

function theme_name_scripts() {
    wp_enqueue_script( 'popcorn', get_template_directory_uri() . '/js/popcorn.js', array(), '1.0.0', true );
}

add_action( 'wp_enqueue_scripts', 'theme_name_scripts' );

/* Dynamic Copyright---------------------WPN-10-03-2016--*/

function dynamic_copyright() {
global $wpdb;
$copyright_dates = $wpdb->get_results("
SELECT
YEAR(min(post_date_gmt)) AS firstdate,
YEAR(max(post_date_gmt)) AS lastdate
FROM
$wpdb->posts
WHERE
post_status = 'publish'
");
$output = '';
if($copyright_dates) {
$copyright = $copyright_dates[0]->firstdate;
if($copyright_dates[0]->firstdate != $copyright_dates[0]->lastdate) {
$copyright .= '-' . $copyright_dates[0]->lastdate;
}
$output = $copyright;
}
return $output;
}

/* Remove WP Logo -------------------------- */


function annointed_admin_bar_remove() {
        global $wp_admin_bar;

        /* Remove their stuff */
        $wp_admin_bar->remove_menu('wp-logo');
}

add_action('wp_before_admin_bar_render', 'annointed_admin_bar_remove', 0);

if ( ! function_exists( 'get_custom_header' ) ) {
    // compatibility with versions of WordPress prior to 3.4.
    add_custom_background();
} else {
    add_theme_support( 'custom-background', apply_filters( 'et_custom_background_args', array() ) );
}

?>