577 lines
15 KiB
PHP
577 lines
15 KiB
PHP
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<?php
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namespace PicoFeed\Parser;
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use SimpleXMLElement;
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use PicoFeed\Client\Url;
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use PicoFeed\Encoding\Encoding;
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use PicoFeed\Filter\Filter;
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use PicoFeed\Logging\Logger;
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use PicoFeed\Scraper\Scraper;
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/**
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* Base parser class.
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*
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* @author Frederic Guillot
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*/
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abstract class Parser
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{
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/**
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* Config object.
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*
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* @var \PicoFeed\Config\Config
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*/
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private $config;
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/**
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* DateParser object.
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*
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* @var \PicoFeed\Parser\DateParser
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*/
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protected $date;
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/**
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* Hash algorithm used to generate item id, any value supported by PHP, see hash_algos().
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*
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* @var string
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*/
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private $hash_algo = 'sha256';
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/**
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* Feed content (XML data).
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*
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* @var string
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*/
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protected $content = '';
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/**
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* Fallback url.
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*
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* @var string
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*/
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protected $fallback_url = '';
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/**
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* XML namespaces supported by parser.
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*
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* @var array
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*/
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protected $namespaces = array();
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/**
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* XML namespaces used in document.
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*
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* @var array
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*/
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protected $used_namespaces = array();
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/**
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* Enable the content filtering.
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*
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* @var bool
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*/
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private $enable_filter = true;
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/**
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* Enable the content grabber.
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*
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* @var bool
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*/
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private $enable_grabber = false;
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/**
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* Enable the content grabber on all pages.
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*
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* @var bool
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*/
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private $grabber_needs_rule_file = false;
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/**
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* Ignore those urls for the content scraper.
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*
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* @var array
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*/
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private $grabber_ignore_urls = array();
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/**
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* Constructor.
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*
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* @param string $content Feed content
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* @param string $http_encoding HTTP encoding (headers)
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* @param string $fallback_url Fallback url when the feed provide relative or broken url
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*/
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public function __construct($content, $http_encoding = '', $fallback_url = '')
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{
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$this->date = new DateParser();
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$this->fallback_url = $fallback_url;
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$xml_encoding = XmlParser::getEncodingFromXmlTag($content);
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// Strip XML tag to avoid multiple encoding/decoding in the next XML processing
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$this->content = Filter::stripXmlTag($content);
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// Encode everything in UTF-8
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Logger::setMessage(get_called_class().': HTTP Encoding "'.$http_encoding.'" ; XML Encoding "'.$xml_encoding.'"');
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$this->content = Encoding::convert($this->content, $xml_encoding ?: $http_encoding);
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}
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/**
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* Parse the document.
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*
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* @return \PicoFeed\Parser\Feed
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*/
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public function execute()
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{
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Logger::setMessage(get_called_class().': begin parsing');
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$xml = XmlParser::getSimpleXml($this->content);
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if ($xml === false) {
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Logger::setMessage(get_called_class().': Applying XML workarounds');
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$this->content = Filter::normalizeData($this->content);
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$xml = XmlParser::getSimpleXml($this->content);
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if ($xml === false) {
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Logger::setMessage(get_called_class().': XML parsing error');
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Logger::setMessage(XmlParser::getErrors());
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throw new MalformedXmlException('XML parsing error');
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}
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}
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$this->used_namespaces = $xml->getNamespaces(true);
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$xml = $this->registerSupportedNamespaces($xml);
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$feed = new Feed();
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$this->findFeedUrl($xml, $feed);
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$this->checkFeedUrl($feed);
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$this->findSiteUrl($xml, $feed);
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$this->checkSiteUrl($feed);
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$this->findFeedTitle($xml, $feed);
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$this->findFeedDescription($xml, $feed);
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$this->findFeedLanguage($xml, $feed);
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$this->findFeedId($xml, $feed);
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$this->findFeedDate($xml, $feed);
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$this->findFeedLogo($xml, $feed);
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$this->findFeedIcon($xml, $feed);
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foreach ($this->getItemsTree($xml) as $entry) {
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$entry = $this->registerSupportedNamespaces($entry);
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$item = new Item();
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$item->xml = $entry;
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$item->namespaces = $this->used_namespaces;
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$this->findItemAuthor($xml, $entry, $item);
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$this->findItemUrl($entry, $item);
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$this->checkItemUrl($feed, $item);
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$this->findItemTitle($entry, $item);
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$this->findItemContent($entry, $item);
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// Id generation can use the item url/title/content (order is important)
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$this->findItemId($entry, $item, $feed);
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$this->findItemDate($entry, $item, $feed);
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$this->findItemEnclosure($entry, $item, $feed);
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$this->findItemLanguage($entry, $item, $feed);
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// Order is important (avoid double filtering)
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$this->filterItemContent($feed, $item);
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$this->scrapWebsite($item);
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$feed->items[] = $item;
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}
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Logger::setMessage(get_called_class().PHP_EOL.$feed);
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return $feed;
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}
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/**
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* Check if the feed url is correct.
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*
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* @param Feed $feed Feed object
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*/
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public function checkFeedUrl(Feed $feed)
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{
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if ($feed->getFeedUrl() === '') {
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$feed->feed_url = $this->fallback_url;
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} else {
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$feed->feed_url = Url::resolve($feed->getFeedUrl(), $this->fallback_url);
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}
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}
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/**
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* Check if the site url is correct.
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*
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* @param Feed $feed Feed object
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*/
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public function checkSiteUrl(Feed $feed)
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{
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if ($feed->getSiteUrl() === '') {
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$feed->site_url = Url::base($feed->getFeedUrl());
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} else {
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$feed->site_url = Url::resolve($feed->getSiteUrl(), $this->fallback_url);
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}
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}
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/**
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* Check if the item url is correct.
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*
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* @param Feed $feed Feed object
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* @param Item $item Item object
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*/
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public function checkItemUrl(Feed $feed, Item $item)
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{
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$item->url = Url::resolve($item->getUrl(), $feed->getSiteUrl());
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}
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/**
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* Fetch item content with the content grabber.
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*
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* @param Item $item Item object
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*/
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public function scrapWebsite(Item $item)
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{
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if ($this->enable_grabber && !in_array($item->getUrl(), $this->grabber_ignore_urls)) {
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$grabber = new Scraper($this->config);
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$grabber->setUrl($item->getUrl());
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if ($this->grabber_needs_rule_file) {
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$grabber->disableCandidateParser();
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}
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$grabber->execute();
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if ($grabber->hasRelevantContent()) {
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$item->content = $grabber->getFilteredContent();
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}
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}
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}
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/**
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* Filter HTML for entry content.
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*
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* @param Feed $feed Feed object
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* @param Item $item Item object
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*/
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public function filterItemContent(Feed $feed, Item $item)
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{
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if ($this->isFilteringEnabled()) {
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$filter = Filter::html($item->getContent(), $feed->getSiteUrl());
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$filter->setConfig($this->config);
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$item->content = $filter->execute();
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} else {
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Logger::setMessage(get_called_class().': Content filtering disabled');
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}
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}
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/**
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* Generate a unique id for an entry (hash all arguments).
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*
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* @return string
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*/
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public function generateId()
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{
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return hash($this->hash_algo, implode(func_get_args()));
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}
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/**
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* Return true if the given language is "Right to Left".
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*
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* @static
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*
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* @param string $language Language: fr-FR, en-US
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*
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* @return bool
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*/
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public static function isLanguageRTL($language)
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{
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$language = strtolower($language);
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$rtl_languages = array(
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'ar', // Arabic (ar-**)
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'fa', // Farsi (fa-**)
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'ur', // Urdu (ur-**)
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'ps', // Pashtu (ps-**)
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'syr', // Syriac (syr-**)
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'dv', // Divehi (dv-**)
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'he', // Hebrew (he-**)
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'yi', // Yiddish (yi-**)
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);
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foreach ($rtl_languages as $prefix) {
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if (strpos($language, $prefix) === 0) {
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return true;
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}
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}
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return false;
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}
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/**
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* Set Hash algorithm used for id generation.
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*
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* @param string $algo Algorithm name
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*
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* @return \PicoFeed\Parser\Parser
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*/
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public function setHashAlgo($algo)
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{
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$this->hash_algo = $algo ?: $this->hash_algo;
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return $this;
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}
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/**
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* Set a different timezone.
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*
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* @see http://php.net/manual/en/timezones.php
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*
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* @param string $timezone Timezone
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*
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* @return \PicoFeed\Parser\Parser
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*/
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public function setTimezone($timezone)
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{
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if ($timezone) {
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$this->date->timezone = $timezone;
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}
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return $this;
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}
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/**
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* Set config object.
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*
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* @param \PicoFeed\Config\Config $config Config instance
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*
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* @return \PicoFeed\Parser\Parser
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*/
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public function setConfig($config)
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{
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$this->config = $config;
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return $this;
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}
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/**
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* Enable the content grabber.
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*
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* @return \PicoFeed\Parser\Parser
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*/
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public function disableContentFiltering()
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{
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$this->enable_filter = false;
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}
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/**
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* Return true if the content filtering is enabled.
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*
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* @return bool
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*/
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public function isFilteringEnabled()
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{
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if ($this->config === null) {
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return $this->enable_filter;
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}
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return $this->config->getContentFiltering($this->enable_filter);
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}
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/**
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* Enable the content grabber.
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*
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* @param bool $needs_rule_file true if only pages with rule files should be
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* scraped
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*
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* @return \PicoFeed\Parser\Parser
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*/
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public function enableContentGrabber($needs_rule_file = false)
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{
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$this->enable_grabber = true;
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$this->grabber_needs_rule_file = $needs_rule_file;
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}
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/**
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* Set ignored URLs for the content grabber.
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*
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* @param array $urls URLs
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*
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* @return \PicoFeed\Parser\Parser
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*/
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public function setGrabberIgnoreUrls(array $urls)
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{
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$this->grabber_ignore_urls = $urls;
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}
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/**
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* Register all supported namespaces to be used within an xpath query.
|
||
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*
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* @param SimpleXMLElement $xml Feed xml
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||
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*
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* @return SimpleXMLElement
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*/
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public function registerSupportedNamespaces(SimpleXMLElement $xml)
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{
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|
|
foreach ($this->namespaces as $prefix => $ns) {
|
||
|
|
$xml->registerXPathNamespace($prefix, $ns);
|
||
|
|
}
|
||
|
|
|
||
|
|
return $xml;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed url.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedUrl(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the site url.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findSiteUrl(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed title.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedTitle(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed description.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedDescription(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed language.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedLanguage(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed id.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedId(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed date.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedDate(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed logo url.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedLogo(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the feed icon.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findFeedIcon(SimpleXMLElement $xml, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get the path to the items XML tree.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed xml
|
||
|
|
*
|
||
|
|
* @return SimpleXMLElement
|
||
|
|
*/
|
||
|
|
abstract public function getItemsTree(SimpleXMLElement $xml);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the item author.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $xml Feed
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param \PicoFeed\Parser\Item $item Item object
|
||
|
|
*/
|
||
|
|
abstract public function findItemAuthor(SimpleXMLElement $xml, SimpleXMLElement $entry, Item $item);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the item URL.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param \PicoFeed\Parser\Item $item Item object
|
||
|
|
*/
|
||
|
|
abstract public function findItemUrl(SimpleXMLElement $entry, Item $item);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the item title.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param \PicoFeed\Parser\Item $item Item object
|
||
|
|
*/
|
||
|
|
abstract public function findItemTitle(SimpleXMLElement $entry, Item $item);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Genereate the item id.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param \PicoFeed\Parser\Item $item Item object
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findItemId(SimpleXMLElement $entry, Item $item, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the item date.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param Item $item Item object
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findItemDate(SimpleXMLElement $entry, Item $item, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the item content.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param \PicoFeed\Parser\Item $item Item object
|
||
|
|
*/
|
||
|
|
abstract public function findItemContent(SimpleXMLElement $entry, Item $item);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the item enclosure.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param \PicoFeed\Parser\Item $item Item object
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findItemEnclosure(SimpleXMLElement $entry, Item $item, Feed $feed);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the item language.
|
||
|
|
*
|
||
|
|
* @param SimpleXMLElement $entry Feed item
|
||
|
|
* @param \PicoFeed\Parser\Item $item Item object
|
||
|
|
* @param \PicoFeed\Parser\Feed $feed Feed object
|
||
|
|
*/
|
||
|
|
abstract public function findItemLanguage(SimpleXMLElement $entry, Item $item, Feed $feed);
|
||
|
|
}
|