silverstripe-cms/code/Controllers/CMSPageEditController.php

<?php

namespace SilverStripe\CMS\Controllers;

use Convert;
use SilverStripe\Admin\AddToCampaignHandler;
use SS_HTTPResponse;

/**
 * @package cms
 */
class CMSPageEditController extends CMSMain {

	private static $url_segment = 'pages/edit';

	private static $url_rule = '/$Action/$ID/$OtherID';

	private static $url_priority = 41;

	private static $required_permission_codes = 'CMS_ACCESS_CMSMain';

	private static $allowed_actions = array(
		'AddToCampaignForm',
	);

	public function getClientConfig()
	{
		return array_merge( parent::getClientConfig(), [
			'form' => [
				'AddToCampaignForm' => [
					'schemaUrl' => $this->Link('schema/AddToCampaignForm')
				],
			],
		]);
	}

	/**
	 * Action handler for adding pages to a campaign
	 *
	 * @param array $data
	 * @param Form $form
	 * @return DBHTMLText|SS_HTTPResponse
	 */
	public function addtocampaign($data, $form)
	{
		$id = $data['ID'];
		$record = \Page::get()->byID($id);

		$handler = AddToCampaignHandler::create($this, $record);
		$results = $handler->addToCampaign($record, $data['Campaign']);
		if (!is_null($results)) {
			$request = $this->getRequest();
			if($request->getHeader('X-Formschema-Request')) {
				$data = $this->getSchemaForForm($handler->Form($record));
				$data['message'] = $results;

				$response = new SS_HTTPResponse(Convert::raw2json($data));
				$response->addHeader('Content-Type', 'application/json');
				return $response;
			}
			return $results;
		}
	}

	/**
	 * Url handler for add to campaign form
	 *
	 * @param SS_HTTPRequest $request
	 * @return Form
	 */
	public function AddToCampaignForm($request)
	{
		// Get ID either from posted back value, or url parameter
		$id = $request->param('ID') ?: $request->postVar('ID');
		return $this->getAddToCampaignForm($id);
	}

	/**
	 * @param int $id
	 * @return Form
	 */
	public function getAddToCampaignForm($id)
	{
		// Get record-specific fields
		$record = \Page::get()->byID($id);

		if (!$record) {
			$this->httpError(404, _t(
				'AssetAdmin.ErrorNotFound',
				'That {Type} couldn\'t be found',
				'',
				['Type' => _t('SiteTree.SINGULARNAME')]
			));
			return null;
		}
		if (!$record->canView()) {
			$this->httpError(403, _t(
				'AssetAdmin.ErrorItemPermissionDenied',
				'It seems you don\'t have the necessary permissions to add {ObjectTitle} to a campaign',
				'',
				['ObjectTitle' => _t('SiteTree.SINGULARNAME')]
			));
			return null;
		}

		$handler = AddToCampaignHandler::create($this, $record);
		return $handler->Form($record);
	}

}