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<?php
namespace ipl\Web\Common;
use ipl\Html\Form;
use ipl\Html\Contract\FormElement;
use LogicException;
trait FormUid
{
protected $uidElementName = 'uid';
/**
* Create a form element to make this form distinguishable from others
*
* You'll have to define a name for the form for this to work.
*
* @return FormElement
*/
protected function createUidElement()
{
/** @var Form $this */
$element = $this->createElement('hidden', $this->uidElementName);
$element->getAttributes()->registerAttributeCallback('value', function () {
/** @var Form $this */
return $this->getAttributes()->get('name')->getValue();
});
return $element;
}
/**
* Get whether the form has been sent
*
* A form is considered sent if the request's method equals the form's method
* and the sent UID is the form's UID.
*
* @return bool
*/
public function hasBeenSent()
{
if (! parent::hasBeenSent()) {
return false;
} elseif ($this->getMethod() === 'GET') {
// Get forms are unlikely to require a UID. If they do, change this.
return true;
}
/** @var Form $this */
$name = $this->getAttributes()->get('name')->getValue();
if (! $name) {
throw new LogicException('Form has no name');
}
$values = $this->getRequest()->getParsedBody();
return isset($values[$this->uidElementName]) && $values[$this->uidElementName] === $name;
}
}
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