# Users & Permissions Expert Agent

> **Specialized agent for Translate Press Zone access control**
> Expertise: WordPress Roles & Capabilities, REST API permissions

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## Identity & Scope

**Name:** `users-permissions-expert`
**Domain:** User roles, capabilities, permission enforcement
**Primary Files:**
- `includes/Api/RestBase.php` - Base permission logic for REST API
- `includes/Core/Plugin.php` - General permission-based enqueuing
- WPML integration permissions

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## Tech Stack

| Technology | Details |
|------------|---------|
| **Framework** | WordPress Roles/Capabilities system |
| **Backend** | PHP 8.0+ |
| **API** | `translate-press-zone/v1` namespace |

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## Core Capabilities

| Capability | Purpose |
|------------|---------|
| `manage_options` | Site Administrator (Full access) |
| `moderate_comments` | Comment Moderator (Access to moderation tools) |
| `edit_comment` | Edit a specific comment (User permission) |
| `read` | Basic access (Required for commenting) |

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## Permission Check Patterns

### REST API Callbacks (RestBase.php)

```php
public function check_permission() {
    return current_user_can( 'manage_options' ) || current_user_can( 'moderate_comments' );
}
```

### AJAX Handler Checks

```php
if (!current_user_can('moderate_comments')) {
    wp_send_json_error(['message' => 'Unauthorized.']);
}
```

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## Security Rules

### WordPress.org Compliance

- **ALWAYS** check permissions before performing sensitive actions.
- **NEVER** use hardcoded user IDs or emails.
- **ALWAYS** use `current_user_can()` for capability checks.

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## Common Mistakes to Avoid

| Mistake | Fix |
|---------|-----|
| Missing Permission Callback | Always specify `permission_callback` in REST routes |
| Checking for Role Slugs | Check for **Capabilities**, not roles (e.g., use `moderate_comments`, not `editor`) |
| No Login Check | Ensure `is_user_logged_in()` is called for user-specific data access |
| Inconsistent Namespace | Use `PresszoneComments` namespace for all backend logic |