silverstripe-framework/tests/php/Forms/FormTest/ControllerWithStrictPostCheck.php

<?php

namespace SilverStripe\Forms\Tests\FormTest;

use SilverStripe\Control\Controller;
use SilverStripe\Dev\TestOnly;
use SilverStripe\Forms\EmailField;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\Form;
use SilverStripe\Forms\FormAction;

/**
 * @skipUpgrade
 */
class ControllerWithStrictPostCheck extends Controller implements TestOnly
{

	private static $allowed_actions = array('Form');

	protected $template = 'BlankPage';

	public function Link($action = null)
	{
		return Controller::join_links(
			'FormTest_ControllerWithStrictPostCheck',
			$this->request->latestParam('Action'),
			$this->request->latestParam('ID'),
			$action
		);
	}

	public function Form()
	{
		$form = new Form(
			$this,
			'Form',
			new FieldList(
				new EmailField('Email')
			),
			new FieldList(
				new FormAction('doSubmit')
			)
		);
		$form->setFormMethod('POST');
		$form->setStrictFormMethodCheck(true);
		$form->disableSecurityToken(); // Disable CSRF protection for easier form submission handling

		return $form;
	}

	public function doSubmit($data, $form, $request)
	{
		$form->sessionMessage('Test save was successful', 'good');
		return $this->redirectBack();
	}
}