REST API - filters not working inside plugin class

Question

I have this code inside plugin I'm writing. I need to add some filters to customize WP REST API anyway I'm noticing that filters seems not working

if( !defined( 'ABSPATH' ) ) {
    exit;
}

class Microservices {
    public function __construct()
    {
        add_filter( 'rest_url_prefix', array( $this, 'set_rest_api_prefix' ) );
        //add_filter( 'rest_authentication_errors', array( $this, 'check_user_authentication' ) );
        //
        //add_action( 'rest_api_init', array( $this, 'extend_default_routes' ) );
        //add_action( 'rest_api_init', array( $this, 'extend_default_rest_fields' ) );
    }

    /*
    *
    */
    public function set_rest_api_prefix()
    {
        return 'api';
    }

    /*
    *
    */
    public function extend_default_routes() 
    {
        //register_rest_route( 
        //    'extranet/', 
        //    'v1/login', 
        //    array(
        //        'methods' => 'POST'
        //    ), 
        //    true 
        //);
        register_rest_route( 
            'extranet/', 
            'v1/userDetails', 
            array(
                'methods' => 'GET',
                'callback' => array( $this, 'get_logged_user_info' )
            ), 
            false 
        );
        //
        register_rest_route( 
            'extranet/', 
            'v1/sendComunication', 
            array(
                'methods' => 'POST',
                'callback' => array( $this, 'send_new_comunication' )
            ), 
            false 
        );
        //
        register_rest_route(
            'extranet/',
            'v1/loadArchive',
            array(
                'methods' => 'GET',
                'callback' => array( $this, 'load_files_archive' )
            )
        );
        //
        register_rest_route( 
            'extranet/', 
            'v1/createFolder', 
            array(
                'methods' => 'POST',
                'callback' => array( $this, 'create_new_folder' )
            ), 
            false 
        );
        //
        register_rest_route(
            'extranet/',
            'v1/uploadFiles',
            array(
                'methods' => 'POST',
                'callback' => array( $this, 'upload_new_files' )
            ),
            false
        );

    } 
    
    /*
    *
    */
    public function extend_default_rest_fields()
    {
        //register_rest_field( 
        //    $object_type:string|array, 
        //    $attribute:string, 
        //    $args:array 
        //);
    }

    /*
    *
    */
    public function check_user_authentication( $result ) 
    {
        // If a previous authentication check was applied,
        // pass that result along without modification.
        if( true === $result || is_wp_error( $result ) ) {
            return $result;
        }

        // No authentication has been performed yet.
        // Return an error if user is not logged in.
        if( !is_user_logged_in() ) {
            return new WP_Error(
                'rest_not_logged_in',
                __( 'You are not currently logged in.' ),
                array( 'status' => 403 )
            );
        }

        // Our custom authentication check should have no effect
        // on logged-in requests
        return $result;
    }
}

new Microservices();

I've tried to call the renamed api from postman in my dev machine using localhost, but it will result in a 404, but the wp-json still work. The plugin is active, so what's the problem with the code?

Answer 1

This is a problem:

public function __contruct()

it should be __construct, the S is missing, meaning there is no constructor and the add_filter calls never happen

The function that registers the routes also never runs because the add_action call is commented out:

//add_action( 'rest_api_init', array( $this, 'extend_default_routes' ) );

This means the constructor never runs, and if it did run the extend_default_routes function would never be called, so the routes are never registered.