app/Module/ClippingsCartModule.php

<?php
/**
 * webtrees: online genealogy
 * Copyright (C) 2018 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
namespace Fisharebest\Webtrees\Module;

use Fisharebest\Webtrees\Auth;
use Fisharebest\Webtrees\Database;
use Fisharebest\Webtrees\Exceptions\FamilyNotFoundException;
use Fisharebest\Webtrees\Exceptions\IndividualNotFoundException;
use Fisharebest\Webtrees\Exceptions\MediaNotFoundException;
use Fisharebest\Webtrees\Exceptions\NoteNotFoundException;
use Fisharebest\Webtrees\Exceptions\RepositoryNotFoundException;
use Fisharebest\Webtrees\Exceptions\SourceNotFoundException;
use Fisharebest\Webtrees\Family;
use Fisharebest\Webtrees\Functions\FunctionsExport;
use Fisharebest\Webtrees\Gedcom;
use Fisharebest\Webtrees\GedcomRecord;
use Fisharebest\Webtrees\I18N;
use Fisharebest\Webtrees\Individual;
use Fisharebest\Webtrees\Media;
use Fisharebest\Webtrees\Menu;
use Fisharebest\Webtrees\Module;
use Fisharebest\Webtrees\Note;
use Fisharebest\Webtrees\Repository;
use Fisharebest\Webtrees\Session;
use Fisharebest\Webtrees\Source;
use Fisharebest\Webtrees\Tree;
use Fisharebest\Webtrees\User;
use League\Flysystem\Filesystem;
use League\Flysystem\ZipArchive\ZipArchiveAdapter;
use Symfony\Component\HttpFoundation\BinaryFileResponse;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\ResponseHeaderBag;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * Class ClippingsCartModule
 */
class ClippingsCartModule extends AbstractModule implements ModuleMenuInterface {
	// Routes that have a record which can be added to the clipboard
	const ROUTES_WITH_RECORDS = ['family', 'individual', 'media', 'note', 'repository', 'source'];

	/** {@inheritdoc} */
	public function getTitle() {
		return /* I18N: Name of a module */
			I18N::translate('Clippings cart');
	}

	/** {@inheritdoc} */
	public function getDescription() {
		return /* I18N: Description of the “Clippings cart” module */
			I18N::translate('Select records from your family tree and save them as a GEDCOM file.');
	}

	/**
	 * What is the default access level for this module?
	 *
	 * Some modules are aimed at admins or managers, and are not generally shown to users.
	 *
	 * @return int
	 */
	public function defaultAccessLevel() {
		return Auth::PRIV_USER;
	}

	/**
	 * The user can re-order menus. Until they do, they are shown in this order.
	 *
	 * @return int
	 */
	public function defaultMenuOrder() {
		return 20;
	}

	/**
	 * A menu, to be added to the main application menu.
	 *
	 * @param Tree $tree
	 *
	 * @return Menu|null
	 */
	public function getMenu(Tree $tree) {
		$request = Request::createFromGlobals();

		$route = $request->get('route');

		$submenus = [
			new Menu($this->getTitle(), route('module', ['module' => 'clippings', 'action' => 'Show', 'ged' => $tree->getName()]), 'menu-clippings-cart', ['rel' => 'nofollow']),
		];

		if (in_array($route, self::ROUTES_WITH_RECORDS)) {
			$xref      = $request->get('xref');
			$action    = 'Add' . ucfirst($route);
			$add_route = route('module', ['module' => 'clippings', 'action' => $action, 'xref' => $xref, 'ged' => $tree->getName()]);

			$submenus[] = new Menu(I18N::translate('Add to the clippings cart'), $add_route, 'menu-clippings-add', ['rel' => 'nofollow']);
		}

		if (!$this->isCartEmpty($tree)) {
			$submenus[] = new Menu(I18N::translate('Empty the clippings cart'), route('module', ['module' => 'clippings', 'action' => 'Empty', 'ged' => $tree->getName()]), 'menu-clippings-empty', ['rel' => 'nofollow']);
			$submenus[] = new Menu(I18N::translate('Download'), route('module', ['module' => 'clippings', 'action' => 'DownloadForm', 'ged' => $tree->getName()]), 'menu-clippings-download', ['rel' => 'nofollow']);
		}

		return new Menu($this->getTitle(), '#', 'menu-clippings', ['rel' => 'nofollow'], $submenus);
	}

	/**
	 * @param Request $request
	 *
	 * @return BinaryFileResponse
	 */
	public function getDownloadAction(Request $request): BinaryFileResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$this->checkModuleAccess($tree);

		$privatize_export = $request->get('privatize_export');
		$convert          = (bool) $request->get('convert');

		$cart = Session::get('cart', []);

		$xrefs = array_keys($cart[$tree->getName()] ?? []);

		// Create a new/empty .ZIP file
		$temp_zip_file  = tempnam(sys_get_temp_dir(), 'webtrees-zip-');
		$zip_filesystem = new Filesystem(new ZipArchiveAdapter($temp_zip_file));

		// Media file prefix
		$path = $tree->getPreference('MEDIA_DIRECTORY');

		// GEDCOM file header
		$filetext = FunctionsExport::gedcomHeader($tree);

		// Include SUBM/SUBN records, if they exist
		$subn =
			Database::prepare("SELECT o_gedcom FROM `##other` WHERE o_type=? AND o_file=?")
				->execute(['SUBN', $tree->getName()])
				->fetchOne();
		if ($subn) {
			$filetext .= $subn . "\n";
		}
		$subm =
			Database::prepare("SELECT o_gedcom FROM `##other` WHERE o_type=? AND o_file=?")
				->execute(['SUBM', $tree->getName()])
				->fetchOne();
		if ($subm) {
			$filetext .= $subm . "\n";
		}

		switch ($privatize_export) {
			case 'gedadmin':
				$access_level = Auth::PRIV_NONE;
				break;
			case 'user':
				$access_level = Auth::PRIV_USER;
				break;
			case 'visitor':
				$access_level = Auth::PRIV_PRIVATE;
				break;
			case 'none':
			default:
				$access_level = Auth::PRIV_HIDE;
				break;
		}

		foreach ($xrefs as $xref) {
			$object = GedcomRecord::getInstance($xref, $tree);
			// The object may have been deleted since we added it to the cart....
			if ($object) {
				$record = $object->privatizeGedcom($access_level);
				// Remove links to objects that aren't in the cart
				preg_match_all('/\n1 ' . WT_REGEX_TAG . ' @(' . WT_REGEX_XREF . ')@(\n[2-9].*)*/', $record, $matches, PREG_SET_ORDER);
				foreach ($matches as $match) {
					if (!array_key_exists($match[1], $xrefs)) {
						$record = str_replace($match[0], '', $record);
					}
				}
				preg_match_all('/\n2 ' . WT_REGEX_TAG . ' @(' . WT_REGEX_XREF . ')@(\n[3-9].*)*/', $record, $matches, PREG_SET_ORDER);
				foreach ($matches as $match) {
					if (!array_key_exists($match[1], $xrefs)) {
						$record = str_replace($match[0], '', $record);
					}
				}
				preg_match_all('/\n3 ' . WT_REGEX_TAG . ' @(' . WT_REGEX_XREF . ')@(\n[4-9].*)*/', $record, $matches, PREG_SET_ORDER);
				foreach ($matches as $match) {
					if (!array_key_exists($match[1], $xrefs)) {
						$record = str_replace($match[0], '', $record);
					}
				}

				if ($convert) {
					$record = utf8_decode($record);
				}
				switch ($object::RECORD_TYPE) {
					case 'INDI':
					case 'FAM':
						$filetext .= $record . "\n";
						$filetext .= "1 SOUR @WEBTREES@\n";
						$filetext .= '2 PAGE ' . WT_BASE_URL . $object->url() . "\n";
						break;
					case 'SOUR':
						$filetext .= $record . "\n";
						$filetext .= '1 NOTE ' . WT_BASE_URL . $object->url() . "\n";
						break;
					case 'OBJE':
						// Add the file to the archive
						foreach ($object->mediaFiles() as $media_file) {
							if (file_exists($media_file->getServerFilename())) {
								$fp = fopen($media_file->getServerFilename(), 'r');
								$zip_filesystem->writeStream($path . $media_file->filename(), $fp);
								fclose($fp);
							}
						}
						$filetext .= $record . "\n";
						break;
					default:
						$filetext .= $record . "\n";
						break;
				}
			}
		}

		// Create a source, to indicate the source of the data.
		$filetext .= "0 @WEBTREES@ SOUR\n1 TITL " . WT_BASE_URL . "\n";
		$author   = User::find($tree->getPreference('CONTACT_EMAIL'));
		if ($author !== null) {
			$filetext .= '1 AUTH ' . $author->getRealName() . "\n";
		}
		$filetext .= "0 TRLR\n";

		// Make sure the preferred line endings are used
		$filetext = preg_replace("/[\r\n]+/", Gedcom::EOL, $filetext);

		if ($convert === 'yes') {
			$filetext = str_replace('UTF-8', 'ANSI', $filetext);
			$filetext = utf8_decode($filetext);
		}

		// Finally add the GEDCOM file to the .ZIP file.
		$zip_filesystem->write('clippings.ged', $filetext);

		// Need to force-close the filesystem
		$zip_filesystem = null;

		$response = new BinaryFileResponse($temp_zip_file);
		$response->deleteFileAfterSend(true);

		$response->headers->set('Content-Type', 'application/zip');
		$response->setContentDisposition(
			ResponseHeaderBag::DISPOSITION_ATTACHMENT,
			'clippings.zip'
		);

		return $response;
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getDownloadFormAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		/** @var User $user */
		$user = $request->attributes->get('user');

		$title = I18N::translate('Family tree clippings cart') . ' — ' . I18N::translate('Download');

		return $this->viewResponse('modules/clippings/download', [
			'is_manager' => Auth::isManager($tree, $user),
			'is_member'  => Auth::isMember($tree, $user),
			'title'      => $title,
		]);
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function getEmptyAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$cart                   = Session::get('cart', []);
		$cart[$tree->getName()] = [];
		Session::put('cart', $cart);

		$url = route('module', ['module' => 'clippings', 'action' => 'Show', 'ged' => $tree->getName()]);

		return new RedirectResponse($url);
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function postRemoveAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref = $request->get('xref');

		$cart = Session::get('cart', []);
		unset($cart[$tree->getName()][$xref]);
		Session::put('cart', $cart);

		$url = route('module', ['module' => 'clippings', 'action' => 'Show', 'ged' => $tree->getName()]);

		return new RedirectResponse($url);
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getShowAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		return $this->viewResponse('modules/clippings/show', [
			'records' => $this->allRecordsInCart($tree),
			'title'   => I18N::translate('Family tree clippings cart'),
			'tree'    => $tree,
		]);
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getAddFamilyAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref = $request->get('xref');

		$family = Family::getInstance($xref, $tree);

		if ($family === null) {
			throw new FamilyNotFoundException;
		}

		$options = $this->familyOptions($family);

		$title = I18N::translate('Add %s to the clippings cart', $family->getFullName());

		return $this->viewResponse('modules/clippings/add-options', [
			'options' => $options,
			'default' => key($options),
			'record'  => $family,
			'title'   => $title,
			'tree'    => $tree,
		]);
	}

	/**
	 * @param Family $family
	 *
	 * @return string[]
	 */
	private function familyOptions(Family $family): array {
		$name = strip_tags($family->getFullName());

		return [
			'parents' => $name,
			'members' => /* I18N: %s is a family (husband + wife) */ I18N::translate('%s and their children', $name),
			'descendants' => /* I18N: %s is a family (husband + wife) */ I18N::translate('%s and their descendants', $name),
			];
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function postAddFamilyAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref   = $request->get('xref');
		$option = $request->get('option');

		$family = Family::getInstance($xref, $tree);

		if ($family === null) {
			throw new FamilyNotFoundException;
		}

		switch ($option) {
			case 'parents':
				$this->addFamilyToCart($family);
				break;

			case 'members':
				$this->addFamilyAndChildrenToCart($family);
				break;

			case 'descendants':
				$this->addFamilyAndDescendantsToCart($family);
				break;
		}

		return new RedirectResponse($family->url());
	}

	/**
	 * @param Family $family
	 */
	private function addFamilyToCart(Family $family) {
		$this->addRecordToCart($family);

		foreach ($family->getSpouses() as $spouse) {
			$this->addRecordToCart($spouse);
		}
	}

	/**
	 * @param Family $family
	 */
	private function addFamilyAndChildrenToCart(Family $family) {
		$this->addRecordToCart($family);

		foreach ($family->getSpouses() as $spouse) {
			$this->addRecordToCart($spouse);
		}
		foreach ($family->getChildren() as $child) {
			$this->addRecordToCart($child);
		}
	}

	/**
	 * @param Family $family
	 */
	private function addFamilyAndDescendantsToCart(Family $family) {
		$this->addRecordToCart($family);

		foreach ($family->getSpouses() as $spouse) {
			$this->addRecordToCart($spouse);
		}
		foreach ($family->getChildren() as $child) {
			$this->addRecordToCart($child);
			foreach ($child->getSpouseFamilies() as $child_family) {
				$this->addFamilyAndDescendantsToCart($child_family);
			}
		}
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getAddIndividualAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref = $request->get('xref');

		$individual = Individual::getInstance($xref, $tree);

		if ($individual === null) {
			throw new IndividualNotFoundException;
		}

		$options = $this->individualOptions($individual);

		$title = I18N::translate('Add %s to the clippings cart', $individual->getFullName());

		return $this->viewResponse('modules/clippings/add-options', [
			'options' => $options,
			'default' => key($options),
			'record'  => $individual,
			'title'   => $title,
			'tree'    => $tree,
		]);
	}

	/**
	 * @param Individual $individual
	 *
	 * @return string[]
	 */
	private function individualOptions(Individual $individual): array {
		$name = strip_tags($individual->getFullName());

		if ($individual->getSex() === 'F') {
			return [
				'self'              => $name,
				'parents'           => I18N::translate('%s, her parents and siblings', $name),
				'spouses'           => I18N::translate('%s, her spouses and children', $name),
				'ancestors'         => I18N::translate('%s and her ancestors', $name),
				'ancestor_families' => I18N::translate('%s, her ancestors and their families', $name),
				'descendants'       => I18N::translate('%s, her spouses and descendants', $name),
			];
		} else {
			return [
				'self'              => $name,
				'parents'           => I18N::translate('%s, his parents and siblings', $name),
				'spouses'           => I18N::translate('%s, his spouses and children', $name),
				'ancestors'         => I18N::translate('%s and his ancestors', $name),
				'ancestor_families' => I18N::translate('%s, his ancestors and their families', $name),
				'descendants'       => I18N::translate('%s, his spouses and descendants', $name),
			];
		}
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function postAddIndividualAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref   = $request->get('xref');
		$option = $request->get('option');

		$individual = Individual::getInstance($xref, $tree);

		if ($individual === null) {
			throw new IndividualNotFoundException;
		}

		switch ($option) {
			case 'self':
				$this->addRecordToCart($individual);
				break;

			case 'parents':
				foreach ($individual->getChildFamilies() as $family) {
					$this->addFamilyAndChildrenToCart($family);
				}
				break;

			case 'spouses':
				foreach ($individual->getSpouseFamilies() as $family) {
					$this->addFamilyAndChildrenToCart($family);
				}
				break;

			case 'ancestors':
				$this->addAncestorsToCart($individual);
				break;

			case 'ancestor_families':
				$this->addAncestorFamiliesToCart($individual);
				break;

			case 'descendants':
				foreach ($individual->getSpouseFamilies() as $family) {
					$this->addFamilyAndDescendantsToCart($family);
				}
				break;
		}

		return new RedirectResponse($individual->url());
	}

	/**
	 * @param Individual $individual
	 */
	private function addAncestorsToCart(Individual $individual) {
		$this->addRecordToCart($individual);

		foreach ($individual->getChildFamilies() as $family) {
			foreach ($family->getSpouses() as $parent) {
				$this->addAncestorsToCart($parent);
			}
		}
	}

	/**
	 * @param Individual $individual
	 */
	private function addAncestorFamiliesToCart(Individual $individual) {
		foreach ($individual->getChildFamilies() as $family) {
			$this->addFamilyAndChildrenToCart($family);
			foreach ($family->getSpouses() as $parent) {
				$this->addAncestorsToCart($parent);
			}
		}
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getAddMediaAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref = $request->get('xref');

		$media  = Media::getInstance($xref, $tree);

		if ($media === null) {
			throw new MediaNotFoundException;
		}

		$options = $this->mediaOptions($media);

		$title = I18N::translate('Add %s to the clippings cart', $media->getFullName());

		return $this->viewResponse('modules/clippings/add-options', [
			'options' => $options,
			'default' => key($options),
			'record'  => $media,
			'title'   => $title,
			'tree'    => $tree,
		]);
	}

	/**
	 * @param Media $media
	 *
	 * @return string[]
	 */
	private function mediaOptions(Media $media): array {
		$name = strip_tags($media->getFullName());

		return [
			'self' => $name,
		];
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function postAddMediaAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref   = $request->get('xref');

		$media = Media::getInstance($xref, $tree);

		if ($media === null) {
			throw new MediaNotFoundException;
		}

		$this->addRecordToCart($media);

		return new RedirectResponse($media->url());
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getAddNoteAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref = $request->get('xref');

		$note  = Note::getInstance($xref, $tree);

		if ($note === null) {
			throw new NoteNotFoundException;
		}

		$options = $this->noteOptions($note);

		$title = I18N::translate('Add %s to the clippings cart', $note->getFullName());

		return $this->viewResponse('modules/clippings/add-options', [
			'options' => $options,
			'default' => key($options),
			'record'  => $note,
			'title'   => $title,
			'tree'    => $tree,
		]);
	}

	/**
	 * @param Note $note
	 *
	 * @return string[]
	 */
	private function noteOptions(Note $note): array {
		$name = strip_tags($note->getFullName());

		return [
			'self' => $name,
		];
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function postAddNoteAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref   = $request->get('xref');

		$note = Note::getInstance($xref, $tree);

		if ($note === null) {
			throw new NoteNotFoundException;
		}

		$this->addRecordToCart($note);

		return new RedirectResponse($note->url());
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getAddRepositoryAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref = $request->get('xref');

		$repository  = Repository::getInstance($xref, $tree);

		if ($repository === null) {
			throw new RepositoryNotFoundException;
		}

		$options = $this->repositoryOptions($repository);

		$title = I18N::translate('Add %s to the clippings cart', $repository->getFullName());

		return $this->viewResponse('modules/clippings/add-options', [
			'options' => $options,
			'default' => key($options),
			'record'  => $repository,
			'title'   => $title,
			'tree'    => $tree,
		]);
	}

	/**
	 * @param Repository $repository
	 *
	 * @return string[]
	 */
	private function repositoryOptions(Repository $repository): array {
		$name = strip_tags($repository->getFullName());

		return [
			'self' => $name,
		];
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function postAddRepositoryAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref   = $request->get('xref');

		$repository = Repository::getInstance($xref, $tree);

		if ($repository === null) {
			throw new RepositoryNotFoundException;
		}

		$this->addRecordToCart($repository);

		return new RedirectResponse($repository->url());
	}

	/**
	 * @param Request $request
	 *
	 * @return Response
	 */
	public function getAddSourceAction(Request $request): Response {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref = $request->get('xref');

		$source  = Source::getInstance($xref, $tree);

		if ($source === null) {
			throw new SourceNotFoundException;
		}

		$options = $this->sourceOptions($source);

		$title = I18N::translate('Add %s to the clippings cart', $source->getFullName());

		return $this->viewResponse('modules/clippings/add-options', [
			'options' => $options,
			'default' => key($options),
			'record'  => $source,
			'title'   => $title,
			'tree'    => $tree,
		]);
	}

	/**
	 * @param Source $source
	 *
	 * @return string[]
	 */
	private function sourceOptions(Source $source): array {
		$name = strip_tags($source->getFullName());

		return [
			'only' => strip_tags($source->getFullName()),
			'linked' => I18N::translate('%s and the individuals that reference it.', $name),
		];
	}

	/**
	 * @param Request $request
	 *
	 * @return RedirectResponse
	 */
	public function postAddSourceAction(Request $request): RedirectResponse {
		/** @var Tree $tree */
		$tree = $request->attributes->get('tree');

		$xref   = $request->get('xref');
		$option = $request->get('option');

		$source = Source::getInstance($xref, $tree);

		if ($source === null) {
			throw new SourceNotFoundException;
		}

		$this->addRecordToCart($source);

		if ($option === 'linked') {
			foreach ($source->linkedIndividuals('SOUR') as $individual) {
				$this->addRecordToCart($individual);
			}
			foreach ($source->linkedFamilies('SOUR') as $family) {
				$this->addRecordToCart($family);
			}
		}

		return new RedirectResponse($source->url());
	}

	/**
	 * Get all the records in the cart.
	 *
	 * @param Tree $tree
	 *
	 * @return GedcomRecord[]
	 */
	private function allRecordsInCart(Tree $tree): array {
		$cart = Session::get('cart', []);

		$xrefs = array_keys($cart[$tree->getName()] ?? []);

		// Fetch all the records in the cart.
		$records = array_map(function (string $xref) use ($tree) {
			return GedcomRecord::getInstance($xref, $tree);
		}, $xrefs);

		// Some records may have been deleted after they were added to the cart.
		$records = array_filter($records);

		// Group and sort.
		uasort($records, function(GedcomRecord $x, GedcomRecord $y) {
			return $x::RECORD_TYPE <=> $y::RECORD_TYPE ?: GedcomRecord::compare($x, $y);
		});

		return $records;
	}

	/**
	 * Add a record (and direclty linked sources, notes, etc. to the cart.
	 *
	 * @param GedcomRecord $record
	 */
	private function addRecordToCart(GedcomRecord $record) {
		$cart = Session::get('cart', []);

		$tree_name = $record->getTree()->getName();

		// Add this record
		$cart[$tree_name][$record->getXref()] = true;

		// Add directly linked media, notes, repositories and sources.
		preg_match_all('/\n\d (?:OBJE|NOTE|SOUR|REPO) @(' . WT_REGEX_XREF . ')@/', $record->getGedcom(), $matches);

		foreach ($matches[1] as $match) {
			$cart[$tree_name][$match] = true;
		}

		Session::put('cart', $cart);
	}

	/**
	 * @param Tree $tree
	 *
	 * @return bool
	 */
	private function isCartEmpty(Tree $tree): bool {
		$cart = Session::get('cart', []);

		return empty($cart[$tree->getName()]);
	}

	/**
	 * Only allow access to the routes/functions if the menu is active
	 *
	 * @param Tree $tree
	 */
	private function checkModuleAccess(Tree $tree) {
		if (!array_key_exists($this->getName(), Module::getActiveMenus($tree))) {
			throw new NotFoundHttpException;
		}
	}
}