10 sample use-cases of permission_callback in register_rest_route WordPress Plugin

The permission_callback parameter in register_rest_route allows you to define custom permission checks for your WordPress REST API endpoints. I’ve listed down 10 sample use-cases:

1. Open Access

Allowing anyone to access the endpoint, effectively making it public.

'permission_callback' => '__return_true'

2. Authenticated Users Only

Only allowing authenticated users to access the endpoint.

'permission_callback' => function() {
    return is_user_logged_in();

3. Admin Users Only

Restricting access to users with administrative capabilities.

'permission_callback' => function() {
    return current_user_can('manage_options');

4. Custom Capability Check

Restricting access based on a custom capability.

'permission_callback' => function() {
    return current_user_can('custom_capability');

5. Role-based Access

Allowing only users with a specific role to access the endpoint.

'permission_callback' => function() {
    $user = wp_get_current_user();
    return in_array('editor', $user->roles);

6. Rate Limiting

Limiting the number of API calls a user can make within a certain time frame.

'permission_callback' => 'rate_limit_check'  // Implement your own rate_limit_check function

7. IP Whitelisting

Allowing only requests from specific IP addresses.

'permission_callback' => function() {
    $allowed_ips = ['', ''];
    return in_array($_SERVER['REMOTE_ADDR'], $allowed_ips);

8. Nonce Verification

Validating a nonce passed in either the request header or parameters.

'permission_callback' => function($request) {
    $nonce = $request->get_header('X-WP-Nonce');
    return wp_verify_nonce($nonce, 'wp_rest');

9. OAuth or JWT Authentication

Validating an OAuth token or JWT for external applications.

'permission_callback' => 'validate_oauth_or_jwt_token'  // Implement your own function

10. Multiple Conditions

Combining multiple conditions using logical operators.

'permission_callback' => function() {
    return is_user_logged_in() && current_user_can('read');

Each of these permission_callback examples serves a different purpose and can be adapted to fit the specific requirements of your plugin or application.


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