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Copyright (C) Villanova University 2010.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2,
as published by the Free Software Foundation.

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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:17:" * fileDescriptor";N;s:7:" * line";i:0;s:7:" * tags";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:5:{s:8:"category";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:8:"category";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:6:"VuFind";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"package";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"package";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:12:"View_Helpers";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:6:"author";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:45:"phpDocumentor\Descriptor\Tag\AuthorDescriptor":3:{s:7:" * name";s:6:"author";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:39:"Demian Katz <demian.katz@villanova.edu>";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"license";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"license";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:69:"http://opensource.org/licenses/gpl-2.0.php GNU General Public License";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:4:"link";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:43:"phpDocumentor\Descriptor\Tag\LinkDescriptor":4:{s:7:" * name";s:4:"link";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:4:"Wiki";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:7:" * link";s:35:"https://vufind.org/wiki/development";}}}}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:19:" * inheritedElement";N;s:7:" * hash";s:32:"86f7a7d245e05fc732537831b3fc0632";s:7:" * path";s:49:"VuFind/src/VuFind/View/Helper/Root/ResultFeed.php";s:9:" * source";s:11299:"<?php

/**
 * "Results as feed" view helper
 *
 * PHP version 8
 *
 * Copyright (C) Villanova University 2010.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category VuFind
 * @package  View_Helpers
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org/wiki/development Wiki
 */

namespace VuFind\View\Helper\Root;

use DateTime;
use Laminas\Feed\Writer\Feed;
use Laminas\Feed\Writer\Writer as FeedWriter;
use Laminas\View\Helper\AbstractHelper;
use Psr\Container\ContainerInterface;
use VuFind\I18n\Translator\TranslatorAwareInterface;

use function is_array;
use function is_string;
use function strlen;

/**
 * "Results as feed" view helper
 *
 * @category VuFind
 * @package  View_Helpers
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org/wiki/development Wiki
 */
class ResultFeed extends AbstractHelper implements TranslatorAwareInterface
{
    use \VuFind\I18n\Translator\TranslatorAwareTrait;

    /**
     * Override title
     *
     * @var string
     */
    protected $overrideTitle = null;

    /**
     * Set override title.
     *
     * @param string $title Title
     *
     * @return void
     */
    public function setOverrideTitle($title)
    {
        $this->overrideTitle = $title;
    }

    /**
     * Set up custom extensions (should be called by factory).
     *
     * @param ContainerInterface $container Service container
     *
     * @return void
     */
    public function registerExtensions(ContainerInterface $container)
    {
        $manager = new \Laminas\Feed\Writer\ExtensionPluginManager($container);
        $manager->setInvokableClass(
            'DublinCore\Renderer\Entry',
            \VuFind\Feed\Writer\Extension\DublinCore\Renderer\Entry::class
        );
        $manager->setInvokableClass(
            'DublinCore\Entry',
            \VuFind\Feed\Writer\Extension\DublinCore\Entry::class
        );
        $manager->setInvokableClass(
            'OpenSearch\Renderer\Feed',
            \VuFind\Feed\Writer\Extension\OpenSearch\Renderer\Feed::class
        );
        $manager->setInvokableClass(
            'OpenSearch\Feed',
            \VuFind\Feed\Writer\Extension\OpenSearch\Feed::class
        );
        FeedWriter::setExtensionManager($manager);
        FeedWriter::registerExtension('OpenSearch');
    }

    /**
     * Represent the current search results as a feed.
     *
     * @param \VuFind\Search\Base\Results $results     Search results to convert to
     * feed
     * @param string                      $currentPath Base path to display in feed
     * (leave null to load dynamically using currentpath view helper)
     *
     * @return Feed
     */
    public function __invoke($results, $currentPath = null)
    {
        // Determine base URL if not already provided:
        if (null === $currentPath) {
            $currentPath = ($this->getView()->plugin('currentPath'))();
        }
        $serverUrl = $this->getView()->plugin('serverurl');
        $baseUrl = $serverUrl($currentPath);
        $lang = $this->getTranslatorLocale();

        // Create the parent feed
        $feed = new Feed();
        $feed->setType('rss');
        if (null !== $this->overrideTitle) {
            $feed->setTitle($this->translate($this->overrideTitle));
        } else {
            $feed->setTitle(
                $this->translate('Results for') . ' '
                . $results->getParams()->getDisplayQuery()
            );
        }
        $feed->setLink(
            $baseUrl . $results->getUrlQuery()
                ->setDefaultParameter('lng', $lang, true)
                ->setViewParam(null)
                ->getParams(false)
        );
        $feed->setFeedLink(
            $baseUrl . $results->getUrlQuery()
                ->setDefaultParameter('lng', $lang, true)
                ->getParams(false),
            $results->getParams()->getView()
        );
        $feed->setDescription(
            strip_tags(
                $this->translate(
                    'showing_results_of_html',
                    [
                        '%%start%%' => $results->getStartRecord(),
                        '%%end%%' => $results->getEndRecord(),
                        '%%total%%' => $results->getResultTotal(),
                    ]
                )
            )
        );

        $params = $results->getParams();

        // add atom links for easier paging
        $feed->addOpensearchLink(
            $baseUrl . $results->getUrlQuery()
                ->setPage(1)
                ->setDefaultParameter('lng', $lang, true)
                ->getParams(false),
            'first',
            $params->getView(),
            $this->translate('page_first')
        );
        if ($params->getPage() > 1) {
            $feed->addOpensearchLink(
                $baseUrl . $results->getUrlQuery()
                    ->setPage($params->getPage() - 1)
                    ->setDefaultParameter('lng', $lang, true)
                    ->getParams(false),
                'previous',
                $params->getView(),
                $this->translate('page_prev')
            );
        }
        $lastPage = ceil($results->getResultTotal() / $params->getLimit());
        if ($params->getPage() < $lastPage) {
            $feed->addOpensearchLink(
                $baseUrl . $results->getUrlQuery()
                    ->setPage($params->getPage() + 1)
                    ->setDefaultParameter('lng', $lang, true)
                    ->getParams(false),
                'next',
                $params->getView(),
                $this->translate('page_next')
            );
        }
        $feed->addOpensearchLink(
            $baseUrl . $results->getUrlQuery()
                ->setPage($lastPage)
                ->setDefaultParameter('lng', $lang, true)
                ->getParams(false),
            'last',
            $params->getView(),
            $this->translate('page_last')
        );

        // add opensearch fields
        $feed->setOpensearchTotalResults($results->getResultTotal());
        $feed->setOpensearchItemsPerPage($params->getLimit());
        $feed->setOpensearchStartIndex($results->getStartRecord() - 1);
        $feed->setOpensearchSearchTerms($params->getQuery()->getAllTerms());

        $records = $results->getResults();
        foreach ($records as $current) {
            $this->addEntry($feed, $current);
        }

        return $feed;
    }

    /**
     * Support method to extract a date from a record driver. Return empty string
     * if no valid match is found.
     *
     * @param \VuFind\RecordDriver\AbstractBase $record Record to read from
     *
     * @return string
     */
    protected function getDcDate($record)
    {
        // See if we can extract a date that's pre-formatted in a DC-friendly way:
        $dates = (array)$record->tryMethod('getPublicationDates');
        $regex = '/[0-9]{4}(\-[01][0-9])?(\-[0-3][0-9])?/';
        foreach ($dates as $date) {
            if (preg_match($regex, $date, $matches)) {
                // If the full string is longer than the match, see if we can use
                // DateTime to format it to something more useful:
                if (strlen($date) > strlen($matches[0])) {
                    try {
                        $formatter = new DateTime($date);
                        return $formatter->format('Y-m-d');
                    } catch (\Exception $ex) {
                        // DateTime failed; fall through to default behavior below.
                    }
                }
                return $matches[0];
            }
        }

        // Still no good? Give up.
        return '';
    }

    /**
     * Support method to turn a record driver object into an RSS entry.
     *
     * @param Feed                              $feed   Feed to update
     * @param \VuFind\RecordDriver\AbstractBase $record Record to add to feed
     *
     * @return void
     */
    protected function addEntry($feed, $record)
    {
        $entry = $feed->createEntry();
        $title = $record->tryMethod('getTitle');
        $title = empty($title) ? $record->getBreadcrumb() : $title;
        $entry->setTitle(
            empty($title) ? $this->translate('Title not available') : $title
        );
        $serverUrl = $this->getView()->plugin('serverurl');
        $recordLinker = $this->getView()->plugin('recordLinker');
        try {
            $url = $serverUrl($recordLinker->getUrl($record));
        } catch (\Laminas\Router\Exception\RuntimeException $e) {
            // No route defined? See if we can get a URL out of the driver.
            // Useful for web results, among other things.
            $url = $record->tryMethod('getUrl');
            if (empty($url) || !is_string($url)) {
                throw new \Exception('Cannot find URL for record.');
            }
        }
        $entry->setLink($url);
        $date = $this->getDateModified($record);
        if (!empty($date)) {
            $entry->setDateModified($date);
        }
        $author = $record->tryMethod('getPrimaryAuthor');
        if (!empty($author)) {
            $entry->addAuthor(['name' => $author]);
        }
        $formats = $record->tryMethod('getFormats');
        if (is_array($formats)) {
            foreach ($formats as $format) {
                $entry->addDCFormat($this->translate($format));
            }
        }
        $dcDate = $this->getDcDate($record);
        if (!empty($dcDate)) {
            $entry->setDCDate($dcDate);
        }

        $feed->addEntry($entry);
    }

    /**
     * Support method to extract modified date from a record driver object.
     *
     * @param \VuFind\RecordDriver\AbstractBase $record Record to pull date from.
     *
     * @return int|DateTime|null
     */
    protected function getDateModified($record)
    {
        // Best case -- "last indexed" date is available:
        $date = $record->tryMethod('getLastIndexed');
        if (!empty($date)) {
            return strtotime($date);
        }

        // Next, try publication date:
        $date = $record->tryMethod('getPublicationDates');
        if (isset($date[0])) {
            // Extract first string of numbers -- this should be a year:
            preg_match('/[^0-9]*([0-9]+).*/', $date[0], $matches);
            $date = new DateTime();
            $date->setDate($matches[1], 1, 1);
            return $date;
        }

        // If we got this far, no date is available:
        return null;
    }
}
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