wpb-access-control

Extensible per-resource access control library for WordPress plugins.

Answers one question: "Does this user have access to this resource?"

The library owns its own database table (managed by BerlinDB), ships WordPress role and user providers out of the box, exposes a REST API for managing rules from any client, and provides a ready-to-drop-in React component so consuming plugins get a full admin UI without writing any front-end code.

Requirements


PHP	7.4+
WordPress	5.9+
Node.js	18+ (only needed if you rebuild the JS assets)
`automattic/jetpack-autoloader`	^5.0 (mandatory — see below)
`berlindb/core`	^2.0 (DB layer)

Installation

composer require wpboilerplate/wpb-access-control

Your composer.json must include Jetpack Autoloader:

{
    "require": {
        "automattic/jetpack-autoloader": "^5.0",
        "berlindb/core": "^2.0",
        "wpboilerplate/wpb-access-control": "dev-main"
    },
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/WPBoilerplate/wpb-access-control.git"
        }
    ],
    "minimum-stability": "dev",
    "prefer-stable": true,
    "config": {
        "allow-plugins": {
            "automattic/jetpack-autoloader": true
        }
    }
}

Why Jetpack Autoloader is mandatory

If two plugins install this library at different versions, PHP throws a fatal "class already declared" error. Jetpack Autoloader scans every installed plugin, finds all copies, and loads only the newest one.

In your plugin's main file, require the Jetpack Autoloader entry point — not the standard vendor/autoload.php:

require_once __DIR__ . '/vendor/autoload_packages.php';

PHP Setup

1. Boot the manager

Declare $manager at file scope (outside any closure) so every subsequent hook can capture it via use. Always pass a plugin-specific filter tag to prevent your providers bleeding into other plugins that also use this library.

use WPBoilerplate\AccessControl\AccessControlManager;

// File scope — available to all hooks below via `use ( $manager )`.
$manager = new AccessControlManager( 'my_plugin_access_control_providers' );

AccessControlManager owns a RuleQuery internally. Instantiating it registers RuleTable via BerlinDB, which creates or upgrades the {prefix}wpb_access_control table automatically on admin_init.

Need to wait for other plugins first? Use a reference capture instead:

$manager = null;
add_action( 'plugins_loaded', function () use ( &$manager ) {
    $manager = new AccessControlManager( 'my_plugin_access_control_providers' );
} );
// All subsequent hooks must also use `&$manager`.

2. Register the REST API

Call register_rest_api() from rest_api_init to expose the wpb-ac/v1 endpoints. The consuming plugin decides whether to enable them.

add_action( 'rest_api_init', function () use ( $manager ) {
    $manager->register_rest_api();
} );

Complete Integration Example

Below is a self-contained my-plugin.php showing all pieces wired together: initialising the manager, registering the REST API, enqueueing the React UI, rendering the mount point, and checking access.

<?php
/**
 * Plugin Name: My Plugin
 */

use WPBoilerplate\AccessControl\AccessControlManager;

// 1. Require Composer autoloader.
require_once __DIR__ . '/vendor/autoload_packages.php';

// 2. Create the manager at file scope — captured by all hooks via `use ( $manager )`.
$manager = new AccessControlManager( 'my_plugin_access_control_providers' );

// 3. Expose the REST API.
add_action( 'rest_api_init', function () use ( $manager ) {
    $manager->register_rest_api();
} );

// 4. Register an admin settings page and capture its hook suffix.
$settings_hook = null;
add_action( 'admin_menu', function () use ( &$settings_hook ) {
    // add_submenu_page() returns the hook suffix needed in admin_enqueue_scripts.
    $settings_hook = add_submenu_page(
        'options-general.php',         // parent menu slug
        'My Plugin Settings',          // page title
        'My Plugin',                   // menu title
        'manage_options',              // capability
        'my-plugin-settings',          // menu slug
        function () {
            echo '<div class="wrap">';
            echo '<h1>My Plugin Settings</h1>';
            // 5. Mount point — the React component attaches here automatically.
            echo '<div id="wpb-access-control"></div>';
            echo '</div>';
        }
    );
} );

// 6. Enqueue the built React UI assets only on the settings page.
add_action( 'admin_enqueue_scripts', function ( string $hook ) use ( &$settings_hook ) {
    if ( $hook !== $settings_hook ) {
        return;
    }

    $asset_file = require __DIR__ . '/vendor/wpboilerplate/wpb-access-control/assets/build/index.asset.php';

    wp_enqueue_script(
        'wpb-ac-ui',
        plugins_url( 'vendor/wpboilerplate/wpb-access-control/assets/build/index.js', __FILE__ ),
        $asset_file['dependencies'],
        $asset_file['version'],
        true
    );

    wp_enqueue_style(
        'wpb-ac-ui',
        plugins_url( 'vendor/wpboilerplate/wpb-access-control/assets/build/index.css', __FILE__ ),
        [],
        $asset_file['version']
    );

    // Pass config to the component via window.wpbAcConfig.
    wp_localize_script( 'wpb-ac-ui', 'wpbAcConfig', [
        'namespace'   => 'my-plugin',
        'resourceKey' => 'settings-page',
        'restApiRoot' => get_rest_url(),
        'nonce'       => wp_create_nonce( 'wp_rest' ),
        'title'       => 'Access Control',
        'saveLabel'   => 'Save',
    ] );
} );

// 7. Gate a resource — call anywhere you need to check access.
add_action( 'template_redirect', function () use ( $manager ) {
    if ( is_page( 'protected' ) && ! $manager->user_has_access( get_current_user_id(), 'my-plugin', 'settings-page' ) ) {
        wp_die( 'Access denied.', '', [ 'response' => 403 ] );
    }
} );

Key points:

$manager is declared once at file scope; all hooks capture it with use ( $manager ).

add_submenu_page() (or add_menu_page()) returns the hook suffix — store it and compare in admin_enqueue_scripts to load assets only on your page.

vendor/autoload_packages.php is the Jetpack Autoloader entry point, not the standard vendor/autoload.php.

Checking Access

$allowed = $manager->user_has_access(
    get_current_user_id(),   // int  — 0 = unauthenticated
    'my-namespace',          // string — your plugin's namespace
    'my-resource'            // string — the specific resource key
);

if ( ! $allowed ) {
    wp_die( 'Access denied.', 403 );
}

Access hierarchy

Step	Condition	Result
1	`access_control_key` is empty or `'everyone'`	Allow
2	User has `manage_options` (administrator)	Always allow
3	User ID = 0 (unauthenticated)	Deny
4	No provider registered for the configured key	Deny
5	`provider->user_has_access()`	Allow or Deny

React Component UI

The library ships a pre-built React component that renders a complete Access Control settings panel. Drop it into any WordPress admin page and it wires itself to the wpb-ac/v1 REST API automatically.

What it looks like

The component has four states driven by a single "Who can access" dropdown:

Dropdown option	Extra UI
No user access added by admin	Nothing — resource is locked (except admins)
Everyone (no restriction)	Nothing — all users can access
WordPress Role	Checkboxes for each WordPress role
Users	Search-as-you-type field + selected-user tags

Custom providers registered via the filter also appear in the dropdown. If they expose options, checkboxes are rendered automatically.

Enqueue the built assets

The compiled assets live in assets/build/. The .asset.php file declares all required WordPress script dependencies so you never need to list them manually.

Getting the right hook suffix: add_menu_page() and add_submenu_page() both return a hook suffix string (e.g. "settings_page_my-plugin"). Capture that return value and compare it in admin_enqueue_scripts so assets load only on your page.

// Capture the hook suffix when registering the page.
$page_hook = add_submenu_page( /* … */ );

add_action( 'admin_enqueue_scripts', function ( string $hook ) use ( $page_hook ) {

    // Only load on the page where you need it.
    if ( $hook !== $page_hook ) {
        return;
    }

    $asset_file = require plugin_dir_path( __FILE__ )
        . 'vendor/wpboilerplate/wpb-access-control/assets/build/index.asset.php';

    wp_enqueue_script(
        'wpb-ac-ui',
        plugin_dir_url( __FILE__ )
            . 'vendor/wpboilerplate/wpb-access-control/assets/build/index.js',
        $asset_file['dependencies'],   // ['react-jsx-runtime', 'wp-api-fetch', 'wp-element']
        $asset_file['version'],
        true
    );

    wp_enqueue_style(
        'wpb-ac-ui',
        plugin_dir_url( __FILE__ )
            . 'vendor/wpboilerplate/wpb-access-control/assets/build/index.css',
        [],
        $asset_file['version']
    );

    // Pass configuration to the component via window.wpbAcConfig.
    wp_localize_script( 'wpb-ac-ui', 'wpbAcConfig', [
        'namespace'   => 'my-namespace',
        'resourceKey' => 'my-resource',
        'restApiRoot' => get_rest_url(),
        'nonce'       => wp_create_nonce( 'wp_rest' ),
        // Optional overrides:
        'title'       => 'Access Control',
        'description' => 'Control which users may access this feature.',
        'saveLabel'   => 'Save Access Control',
    ] );
} );

Render target

Add an empty <div> with the id wpb-access-control anywhere in your admin page template. The component mounts itself automatically.

add_action( 'my_plugin_settings_page', function () {
    echo '<div id="wpb-access-control"></div>';
} );

Component props reference

Prop	Type	Required	Default	Description
`namespace`	`string`	✅	—	Access-control namespace, e.g. `"mcp"`
`resourceKey`	`string`	✅	—	Resource key within the namespace
`restApiRoot`	`string`	✅	—	WP REST API root URL (`get_rest_url()`)
`nonce`	`string`	✅	—	`wp_create_nonce('wp_rest')`
`title`	`string`		`"Access Control"`	Card heading
`description`	`string`		(MCP-server copy)	Subtitle paragraph
`saveLabel`	`string`		`"Save Access Control"`	Save button label
`onSave`	`Function`		—	Callback `(acKey, acOptions)` after a successful save

Using the component as a JS import

If your plugin has its own webpack build, import the component directly:

import apiFetch from '@wordpress/api-fetch';
import { AccessControl } from '@wpb/access-control'; // or relative path

// Set up the nonce once before rendering.
apiFetch.use( apiFetch.createNonceMiddleware( wpbAcConfig.nonce ) );

// Render into any DOM node.
import { createRoot } from '@wordpress/element';
createRoot( document.getElementById( 'my-ac-panel' ) ).render(
    <AccessControl
        namespace="my-namespace"
        resourceKey="my-resource"
        restApiRoot={ wpbAcConfig.restApiRoot }
        nonce={ wpbAcConfig.nonce }
        onSave={ ( acKey, acOptions ) => console.log( 'Saved', acKey, acOptions ) }
    />
);

Note: When importing directly the nonce middleware must be registered before the first apiFetch call. The auto-render path (index.js) handles this automatically.

Namespace slashes

Namespaces containing slashes (e.g. procureco/v1) are handled automatically by the component — each segment is encodeURIComponent-encoded so they reach the REST API as %2F.

Reading & Writing Rules (PHP)

Use RuleQuery when you need to read or write rules from PHP directly.

use WPBoilerplate\AccessControl\Database\Rule\RuleQuery;

$query = new RuleQuery();

// Read the current rule.
$rule = $query->get_rule( 'my-namespace', 'my-resource' );
// → ['key' => 'wp_role', 'value' => ['editor', 'author']]
// → ['key' => '',        'value' => []]   when no rule is set

// Save a rule (inputs are sanitized internally).
$query->set_rule( 'my-namespace', 'my-resource', 'wp_role', ['editor', 'author'] );

// Allow everyone.
$query->set_rule( 'my-namespace', 'my-resource', 'everyone', [] );

// Clear a rule (reverts to "no restriction configured").
$query->clear_rule( 'my-namespace', 'my-resource' );

// Plugin uninstall — delete all rows for your namespace.
$query->purge_namespace( 'my-namespace' );

You can also access the same instance through the manager:

$rule = $manager->get_query()->get_rule( 'my-namespace', 'my-resource' );

REST API

REST namespace: wpb-ac/v1

All endpoints require manage_options (administrator) by default. Use the wpb_access_control_rest_permission filter to override.

Endpoints

Method	Path	Description
`GET`	`/rules/{namespace}/{key}`	Read the current rule
`PUT`	`/rules/{namespace}/{key}`	Create or replace a rule
`DELETE`	`/rules/{namespace}/{key}`	Clear a rule (revert to unrestricted)
`DELETE`	`/namespaces/{namespace}`	Purge all rules for a namespace
`GET`	`/providers`	List registered providers and their options
`GET`	`/users?search=...&limit=10`	Search WordPress users

Slashes in namespace: The {namespace} URL segment cannot contain literal slashes — encode them as %2F: .../rules/procureco%2Fv1/my-key. The {key} segment allows literal slashes.

Request / response shapes

GET /rules/{namespace}/{key}

{ "key": "wp_role", "value": ["editor", "author"] }
{ "key": "", "value": [] }

PUT /rules/{namespace}/{key} — body:

{ "ac_key": "wp_role", "ac_options": ["editor", "author"] }

Response:

{ "success": true, "rule": { "key": "wp_role", "value": ["editor", "author"] } }

DELETE /rules/{namespace}/{key}

{ "success": true }

DELETE /namespaces/{namespace}

{ "deleted": 5 }

GET /providers

[
  { "id": "wp_role", "label": "WordPress Role", "options": [{"id":"editor","label":"Editor"}, ...], "available": true },
  { "id": "wp_user", "label": "Users",          "options": [],                                       "available": true }
]

GET /users?search=jane&limit=10

[
  { "id": "5", "login": "jane", "email": "jane@example.com", "display_name": "Jane Doe" }
]

Authentication

WordPress admin (nonce)

Include the wp_rest nonce in the X-WP-Nonce header:

$nonce = wp_create_nonce( 'wp_rest' );

Application Passwords (external clients)

Authorization: Basic base64(username:application_password)

Code examples

cURL

# Read
curl -H "X-WP-Nonce: <nonce>" \
  https://example.com/wp-json/wpb-ac/v1/rules/my-namespace/my-resource

# Set
curl -X PUT \
  -H "X-WP-Nonce: <nonce>" \
  -H "Content-Type: application/json" \
  -d '{"ac_key":"wp_role","ac_options":["editor","author"]}' \
  https://example.com/wp-json/wpb-ac/v1/rules/my-namespace/my-resource

# Namespace with slashes
curl -X PUT \
  -H "X-WP-Nonce: <nonce>" \
  -H "Content-Type: application/json" \
  -d '{"ac_key":"wp_role","ac_options":["editor"]}' \
  https://example.com/wp-json/wpb-ac/v1/rules/procureco%2Fv1/endpoints%2Flist

# Clear
curl -X DELETE \
  -H "X-WP-Nonce: <nonce>" \
  https://example.com/wp-json/wpb-ac/v1/rules/my-namespace/my-resource

PHP (`wp_remote_request`)

// Read
$response = wp_remote_get(
    rest_url( 'wpb-ac/v1/rules/my-namespace/my-resource' ),
    [ 'headers' => [ 'X-WP-Nonce' => wp_create_nonce( 'wp_rest' ) ] ]
);
$rule = json_decode( wp_remote_retrieve_body( $response ), true );

// Set
wp_remote_request(
    rest_url( 'wpb-ac/v1/rules/my-namespace/my-resource' ),
    [
        'method'  => 'PUT',
        'headers' => [
            'Content-Type' => 'application/json',
            'X-WP-Nonce'   => wp_create_nonce( 'wp_rest' ),
        ],
        'body' => wp_json_encode( [ 'ac_key' => 'wp_role', 'ac_options' => [ 'editor' ] ] ),
    ]
);

`@wordpress/api-fetch`

import apiFetch from '@wordpress/api-fetch';

// Read
const rule = await apiFetch( { path: '/wpb-ac/v1/rules/my-namespace/my-resource' } );

// Set
await apiFetch( {
    path:   '/wpb-ac/v1/rules/my-namespace/my-resource',
    method: 'PUT',
    data:   { ac_key: 'wp_role', ac_options: [ 'editor', 'author' ] },
} );

// Search users (for the wp_user provider UI)
const users = await apiFetch( { path: '/wpb-ac/v1/users?search=jane&limit=10' } );

// List providers (for building a custom UI)
const providers = await apiFetch( { path: '/wpb-ac/v1/providers' } );

Vanilla `fetch`

const nonce  = document.querySelector( 'meta[name="wp-rest-nonce"]' )?.content;
const apiUrl = '/wp-json/wpb-ac/v1';

// Read
const rule = await fetch( `${apiUrl}/rules/my-namespace/my-resource`, {
    headers: { 'X-WP-Nonce': nonce },
} ).then( r => r.json() );

// Set
await fetch( `${apiUrl}/rules/my-namespace/my-resource`, {
    method:  'PUT',
    headers: { 'Content-Type': 'application/json', 'X-WP-Nonce': nonce },
    body:    JSON.stringify( { ac_key: 'wp_role', ac_options: [ 'editor' ] } ),
} );

Permission filter

Override who may call any endpoint:

add_filter( 'wpb_access_control_rest_permission', function ( bool $can, WP_REST_Request $request ): bool {
    // Allow editors to read rules, but only admins to write.
    if ( 'GET' === $request->get_method() ) {
        return current_user_can( 'edit_posts' );
    }
    return $can;
}, 10, 2 );

Write authorization filter

Restrict which namespace/key pairs may be modified:

add_filter( 'wpb_access_control_can_save', function ( bool $can, string $namespace, string $key, int $user_id ): bool {
    return 'my-namespace' === $namespace;
}, 10, 4 );

Events

`wpb_access_control_denied`

Fires whenever user_has_access() returns false (steps 3–5 of the hierarchy).

add_action( 'wpb_access_control_denied', function (
    int    $user_id,
    string $namespace,
    string $key,
    string $ac_key,
    array  $options
): void {
    error_log( "Access denied — user:{$user_id} {$namespace}/{$key}" );
}, 10, 5 );

`wpb_access_control_saved`

Fires after any successful write via the REST API (PUT rule, DELETE rule, DELETE namespace). $ac_key is '' on a clear.

add_action( 'wpb_access_control_saved', function (
    string $namespace,
    string $key,
    string $ac_key,
    array  $ac_options,
    int    $user_id
): void {
    // Audit log, cache bust, etc.
}, 10, 5 );

Custom Providers

Register

add_filter( 'my_plugin_access_control_providers', function ( array $providers ): array {
    $providers[] = new My\Plugin\MembershipProvider();
    return $providers;
} );

The filter tag must match the string passed to AccessControlManager. Register at init priority ≤ 4 (the filter fires at priority 5).

Contract (`AbstractProvider`)

Method	Required	Description
`get_id(): string`	✅	Unique slug stored as `access_control_key`
`get_label(): string`	✅	Human-readable label shown in the UI dropdown
`get_options(): array`	✅	`[['id'=>'slug','label'=>'Name'], ...]`; return `[]` for dynamic providers
`user_has_access(int $user_id, array $selected): bool`	✅	Core access check
`is_available(): bool`		Return `false` when a required dependency is inactive

Example provider

namespace My\Plugin;

use WPBoilerplate\AccessControl\AbstractProvider;

class MembershipProvider extends AbstractProvider {

    public function get_id(): string    { return 'my_membership'; }
    public function get_label(): string { return __( 'Membership Level', 'my-plugin' ); }

    public function get_options(): array {
        return [
            [ 'id' => 'gold',   'label' => 'Gold'   ],
            [ 'id' => 'silver', 'label' => 'Silver' ],
        ];
    }

    public function user_has_access( int $user_id, array $selected_options ): bool {
        return in_array( my_get_membership_level( $user_id ), $selected_options, true );
    }

    public function is_available(): bool {
        return function_exists( 'my_get_membership_level' );
    }
}

Providers and their options are surfaced by GET /wpb-ac/v1/providers, so any front-end UI (including the built-in React component) can render the correct controls dynamically without hard-coding provider IDs.

Built-in Providers

Provider ID	Class	Description
`wp_role`	`WpRoleProvider`	Restricts by WordPress user role. Administrator is always bypassed.
`wp_user`	`WpUserProvider`	Restricts to specific WordPress users by ID.

`WpRoleProvider` filters

Filter	Signature	Description
`wpb_access_control_wp_role_options`	`(array $options): array`	Add or remove selectable role options
`wpb_access_control_wp_role_has_access`	`(bool $result, int $user_id, array $selected): bool`	Override the final role-based decision

`WpUserProvider`

Options are user IDs stored as strings ("42"), not usernames or emails — sanitize_key() strips @ and ., so email addresses would be corrupted.

use WPBoilerplate\AccessControl\WpUserProvider;

// Search by login, email, or display name.
$results = WpUserProvider::search_users( 'jane', 10 );
// → [['id'=>'5','login'=>'jane','email'=>'jane@example.com','display_name'=>'Jane Doe'], ...]

// Hydrate stored IDs → display data (useful for custom UIs).
$users = WpUserProvider::get_users_by_ids( ['5', '42'] );

Filter	Signature	Description
`wpb_access_control_wp_user_has_access`	`(bool $result, int $user_id, array $selected): bool`	Override the final per-user decision

Important Notes

Filter tag isolation

Always pass a plugin-specific tag to AccessControlManager. Two plugins sharing the same filter tag will bleed providers into each other's checks.

Table management

BerlinDB handles all table creation and upgrades automatically on admin_init. No activation hook is needed — instantiating new AccessControlManager(...) is sufficient.

Caching

Always use RuleQuery::set_rule() and clear_rule(). Direct $wpdb writes bypass BerlinDB's object cache and leave it stale.

Administrator bypass is unconditional

Any user with manage_options always passes user_has_access() regardless of the stored rule. This cannot be disabled.

Uninstall cleanup

Each consuming plugin removes its own rows:

// uninstall.php
( new \WPBoilerplate\AccessControl\Database\Rule\RuleQuery() )
    ->purge_namespace( 'my-namespace' );

Multisite

The table uses $wpdb->prefix — each sub-site has its own {prefix}wpb_access_control table. Network-wide rules must be handled by the consuming plugin.

Database Table Reference

Table: {prefix}wpb_access_control · DB layer: BerlinDB ^2.0 · Schema version: 202605120001

Column	Type	Notes
`id`	BIGINT UNSIGNED PK AI
`namespace`	VARCHAR(100) NOT NULL	Plugin-scoped prefix, e.g. `mcp`, `procureco/v1`
`key`	VARCHAR(255) NOT NULL	Resource identifier within the namespace
`access_control_key`	VARCHAR(100) NOT NULL	Rule type slug — same for every row of a `(ns, key)` pair
`access_control_value`	VARCHAR(255) NOT NULL	One option per row; `''` for the `everyone` sentinel
`created_at`	DATETIME	BerlinDB-managed on INSERT
`updated_at`	DATETIME	BerlinDB-managed on UPDATE

Indexes: PRIMARY KEY (id) · UNIQUE (namespace, key(191), access_control_value) · KEY (namespace, key(191))

Rule storage convention

Logical state	Rows in table
No rule configured	No rows for that `(namespace, key)`
`everyone`	One row: `access_control_key='everyone'`, `access_control_value=''`
`wp_role` + `['editor','author']`	Two rows, both `access_control_key='wp_role'`; values `'editor'`, `'author'`
`wp_user` + `['1','42']`	Two rows, both `access_control_key='wp_user'`; values `'1'`, `'42'`

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README.md		README.md
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wpb-access-control

Table of Contents

Requirements

Installation

PHP Setup

1. Boot the manager

2. Register the REST API

Complete Integration Example

Checking Access

Access hierarchy

React Component UI

What it looks like

Enqueue the built assets

Render target

Component props reference

Using the component as a JS import

Namespace slashes

Reading & Writing Rules (PHP)

REST API

Endpoints

Request / response shapes

Authentication

Code examples

cURL

PHP (wp_remote_request)

@wordpress/api-fetch

Vanilla fetch

Permission filter

Write authorization filter

Events

wpb_access_control_denied

wpb_access_control_saved

Custom Providers

Register

Contract (AbstractProvider)

Example provider

Built-in Providers

WpRoleProvider filters

WpUserProvider

Important Notes

Filter tag isolation

Table management

Caching

Administrator bypass is unconditional

Uninstall cleanup

Multisite

Database Table Reference

Rule storage convention

About

Resources

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Languages

PHP (`wp_remote_request`)

`@wordpress/api-fetch`

Vanilla `fetch`

`wpb_access_control_denied`

`wpb_access_control_saved`

Contract (`AbstractProvider`)

`WpRoleProvider` filters

`WpUserProvider`

Packages