зеркало из https://github.com/nextcloud/news.git
254 строки
8.8 KiB
PHP
254 строки
8.8 KiB
PHP
<?php
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/**
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* ownCloud - News
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*
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* This file is licensed under the Affero General Public License version 3 or
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* later. See the COPYING file.
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*
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* @author Alessandro Cosentino <cosenal@gmail.com>
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* @author Bernhard Posselt <dev@bernhard-posselt.com>
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* @copyright Alessandro Cosentino 2012
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* @copyright Bernhard Posselt 2012, 2014
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*/
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namespace OCA\News\Fetcher;
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use Exception;
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use PicoFeed\Parser\MalFormedXmlException;
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use PicoFeed\Reader\Reader;
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use PicoFeed\Parser\Parser;
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use PicoFeed\Reader\SubscriptionNotFoundException;
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use PicoFeed\Reader\UnsupportedFeedFormatException;
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use PicoFeed\Client\InvalidCertificateException;
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use PicoFeed\Client\InvalidUrlException;
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use PicoFeed\Client\MaxRedirectException;
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use PicoFeed\Client\MaxSizeException;
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use PicoFeed\Client\TimeoutException;
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use PicoFeed\Client\ForbiddenException;
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use PicoFeed\Client\UnauthorizedException;
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use OCP\IL10N;
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use OCP\AppFramework\Utility\ITimeFactory;
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use OCA\News\Db\Item;
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use OCA\News\Db\Feed;
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use OCA\News\Utility\PicoFeedFaviconFactory;
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use OCA\News\Utility\PicoFeedReaderFactory;
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class FeedFetcher implements IFeedFetcher {
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private $faviconFactory;
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private $reader;
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private $l10n;
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private $time;
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public function __construct(Reader $reader,
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PicoFeedFaviconFactory $faviconFactory,
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IL10N $l10n,
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ITimeFactory $time){
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$this->faviconFactory = $faviconFactory;
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$this->reader = $reader;
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$this->time = $time;
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$this->l10n = $l10n;
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}
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/**
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* This fetcher handles all the remaining urls therefore always returns true
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*/
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public function canHandle($url){
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return true;
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}
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/**
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* Fetch a feed from remote
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* @param string $url remote url of the feed
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* @param boolean $getFavicon if the favicon should also be fetched,
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* defaults to true
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* @param string $lastModified a last modified value from an http header
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* defaults to false. If lastModified matches the http header from the feed
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* no results are fetched
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* @param string $etag an etag from an http header.
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* If lastModified matches the http header from the feed
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* no results are fetched
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* @param bool fullTextEnabled if true tells the fetcher to enhance the
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* articles by fetching custom enhanced content
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* @param string $basicAuthUser if given, basic auth is set for this feed
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* @param string $basicAuthPassword if given, basic auth is set for this
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* feed. Ignored if user is null or an empty string
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* @throws FetcherException if it fails
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* @return array an array containing the new feed and its items, first
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* element being the Feed and second element being an array of Items
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*/
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public function fetch($url, $getFavicon=true, $lastModified=null,
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$etag=null, $fullTextEnabled=false,
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$basicAuthUser=null, $basicAuthPassword=null) {
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try {
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if ($basicAuthUser !== null && trim($basicAuthUser) !== '') {
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$resource = $this->reader->discover($url, $lastModified, $etag,
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$basicAuthUser,
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$basicAuthPassword);
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} else {
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$resource = $this->reader->discover($url, $lastModified, $etag);
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}
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if (!$resource->isModified()) {
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return [null, null];
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}
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$location = $resource->getUrl();
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$etag = $resource->getEtag();
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$content = $resource->getContent();
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$encoding = $resource->getEncoding();
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$lastModified = $resource->getLastModified();
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$parser = $this->reader->getParser($location, $content, $encoding);
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if ($fullTextEnabled) {
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$parser->enableContentGrabber();
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}
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$parsedFeed = $parser->execute();
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$feed = $this->buildFeed(
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$parsedFeed, $url, $getFavicon, $lastModified, $etag, $location
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);
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$items = [];
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foreach($parsedFeed->getItems() as $item) {
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$items[] = $this->buildItem($item, $parsedFeed);
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}
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return [$feed, $items];
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} catch(Exception $ex){
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$this->handleError($ex);
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}
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}
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private function handleError(Exception $ex) {
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$msg = $ex->getMessage();
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if ($ex instanceof MalFormedXmlException) {
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$msg = $this->l10n->t('Feed contains invalid XML');
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} else if ($ex instanceof SubscriptionNotFoundException) {
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$msg = $this->l10n->t('Feed not found: either the website ' .
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'does not provide a feed or blocks access. To rule out ' .
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'blocking, try to download the feed on your server\'s ' .
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'command line using curl: curl http://the-feed.tld');
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} else if ($ex instanceof UnsupportedFeedFormatException) {
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$msg = $this->l10n->t('Detected feed format is not supported');
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} else if ($ex instanceof InvalidCertificateException) {
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$msg = $this->l10n->t('SSL Certificate is invalid');
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} else if ($ex instanceof InvalidUrlException) {
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$msg = $this->l10n->t('Website not found');
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} else if ($ex instanceof MaxRedirectException) {
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$msg = $this->l10n->t('More redirects than allowed, aborting');
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} else if ($ex instanceof MaxSizeException) {
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$msg = $this->l10n->t('Bigger than maximum allowed size');
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} else if ($ex instanceof TimeoutException) {
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$msg = $this->l10n->t('Request timed out');
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} else if ($ex instanceof UnauthorizedException) {
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$msg = $this->l10n->t('Required credentials for feed were ' .
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'either missing or incorrect');
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} else if ($ex instanceof ForbiddenException) {
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$msg = $this->l10n->t('Forbidden to access feed');
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}
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throw new FetcherException($msg);
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}
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private function decodeTwice($string) {
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return html_entity_decode(
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html_entity_decode(
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$string, ENT_QUOTES | ENT_HTML5, 'UTF-8'
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),
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ENT_QUOTES | ENT_HTML5, 'UTF-8'
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);
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}
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protected function determineRtl($parsedItem, $parsedFeed) {
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$itemLang = $parsedItem->getLanguage();
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$feedLang = $parsedFeed->getLanguage();
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if ($itemLang) {
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return Parser::isLanguageRTL($itemLang);
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} else {
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return Parser::isLanguageRTL($feedLang);
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}
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}
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protected function buildItem($parsedItem, $parsedFeed) {
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$item = new Item();
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$item->setUnread();
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$item->setUrl($parsedItem->getUrl());
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$item->setGuid($parsedItem->getId());
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$item->setGuidHash($item->getGuid());
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$item->setPubDate($parsedItem->getDate()->getTimestamp());
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$item->setLastModified($this->time->getTime());
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$item->setRtl($this->determineRtl($parsedItem, $parsedFeed));
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// unescape content because angularjs helps against XSS
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$item->setTitle($this->decodeTwice($parsedItem->getTitle()));
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$item->setAuthor($this->decodeTwice($parsedItem->getAuthor()));
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// purification is done in the service layer
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$body = $parsedItem->getContent();
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$body = mb_convert_encoding($body, 'HTML-ENTITIES',
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mb_detect_encoding($body));
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$item->setBody($body);
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$enclosureUrl = $parsedItem->getEnclosureUrl();
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if($enclosureUrl) {
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$enclosureType = $parsedItem->getEnclosureType();
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if(stripos($enclosureType, 'audio/') !== false ||
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stripos($enclosureType, 'video/') !== false) {
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$item->setEnclosureMime($enclosureType);
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$item->setEnclosureLink($enclosureUrl);
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}
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}
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$item->generateSearchIndex();
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return $item;
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}
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protected function buildFeed($parsedFeed, $url, $getFavicon, $modified,
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$etag, $location) {
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$feed = new Feed();
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$link = $parsedFeed->getSiteUrl();
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if (!$link) {
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$link = $location;
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}
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// unescape content because angularjs helps against XSS
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$title = strip_tags($this->decodeTwice($parsedFeed->getTitle()));
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$feed->setTitle($title);
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$feed->setUrl($url); // the url used to add the feed
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$feed->setLocation($location); // the url where the feed was found
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$feed->setLink($link); // <link> attribute in the feed
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$feed->setLastModified($modified);
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$feed->setEtag($etag);
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$feed->setAdded($this->time->getTime());
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if ($getFavicon) {
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$faviconFetcher = $this->faviconFactory->build();
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$favicon = $faviconFetcher->find($feed->getLink());
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$feed->setFaviconLink($favicon);
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}
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return $feed;
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}
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}
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