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made ZapHandler library

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Fabian de Boer 2026-07-18 11:56:54 +02:00
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# ZAPHandler Interface
| File | Change |
|------|--------|
| **`lib/ZAPHandler.interface.php`** | **Created** — defines `ZAPHandler` interface with `public function getContent()` |
| **`lib/ZAPHome.class.php`** | Added `implements ZAPHandler` |
| **`lib/ZAPDisplay.class.php`** | Added `implements ZAPHandler` |
| **`lib/ZAPZap.class.php`** | Added `implements ZAPHandler` |
| **`lib/ZAPController.class.php`** | Added `instanceof ZAPHandler` guard inside `fetch()` before calling `getContent()` |
### How it works
- Any class named `ZAP{Mode}` in `lib/` is autoloaded and instantiated by `ZAPController`
- The controller now checks `$this->action instanceof ZAPHandler` **before** calling `getContent()`
- If a handler forgets to implement the interface, you get a clear `die()` message instead of a cryptic runtime error
- The interface file uses the `.interface.php` naming convention, which the existing autoloader already handles (it checks `.interface.php` first, then `.class.php`)