miniflux-legacy/vendor/miniflux/picofeed/lib/PicoFeed/Parser/Parser.php
Frédéric Guillot 32a60fd614 Update PicoFeed
2017-06-20 19:41:55 -04:00

397 lines
11 KiB
PHP

<?php
namespace PicoFeed\Parser;
use PicoFeed\Processor\ContentFilterProcessor;
use PicoFeed\Processor\ContentGeneratorProcessor;
use PicoFeed\Processor\ItemPostProcessor;
use PicoFeed\Processor\ScraperProcessor;
use SimpleXMLElement;
use PicoFeed\Client\Url;
use PicoFeed\Encoding\Encoding;
use PicoFeed\Filter\Filter;
use PicoFeed\Logging\Logger;
/**
* Base parser class.
*
* @package PicoFeed\Parser
* @author Frederic Guillot
*/
abstract class Parser implements ParserInterface
{
/**
* Config object.
*
* @var \PicoFeed\Config\Config
*/
private $config;
/**
* DateParser object.
*
* @var \PicoFeed\Parser\DateParser
*/
private $dateParser;
/**
* Hash algorithm used to generate item id, any value supported by PHP, see hash_algos().
*
* @var string
*/
private $hash_algo = 'sha256';
/**
* Feed content (XML data).
*
* @var string
*/
protected $content = '';
/**
* Fallback url.
*
* @var string
*/
protected $fallback_url = '';
/**
* XML namespaces supported by parser.
*
* @var array
*/
protected $namespaces = array();
/**
* XML namespaces used in document.
*
* @var array
*/
protected $used_namespaces = array();
/**
* Item Post Processor instance
*
* @access private
* @var ItemPostProcessor
*/
private $itemPostProcessor;
/**
* Constructor.
*
* @param string $content Feed content
* @param string $http_encoding HTTP encoding (headers)
* @param string $fallback_url Fallback url when the feed provide relative or broken url
*/
public function __construct($content, $http_encoding = '', $fallback_url = '')
{
$this->fallback_url = $fallback_url;
$xml_encoding = XmlParser::getEncodingFromXmlTag($content);
// Strip XML tag to avoid multiple encoding/decoding in the next XML processing
$this->content = Filter::stripXmlTag($content);
// Encode everything in UTF-8
Logger::setMessage(get_called_class().': HTTP Encoding "'.$http_encoding.'" ; XML Encoding "'.$xml_encoding.'"');
$this->content = Encoding::convert($this->content, $xml_encoding ?: $http_encoding);
$this->itemPostProcessor = new ItemPostProcessor($this->config);
$this->itemPostProcessor->register(new ContentGeneratorProcessor($this->config));
$this->itemPostProcessor->register(new ContentFilterProcessor($this->config));
}
/**
* Parse the document.
* @return Feed
* @throws MalformedXmlException
*/
public function execute()
{
Logger::setMessage(get_called_class().': begin parsing');
$xml = XmlParser::getSimpleXml($this->content);
if ($xml === false) {
Logger::setMessage(get_called_class().': Applying XML workarounds');
$this->content = Filter::normalizeData($this->content);
$xml = XmlParser::getSimpleXml($this->content);
if ($xml === false) {
Logger::setMessage(get_called_class().': XML parsing error');
Logger::setMessage(XmlParser::getErrors());
throw new MalformedXmlException('XML parsing error');
}
}
$this->used_namespaces = $xml->getNamespaces(true);
$xml = $this->registerSupportedNamespaces($xml);
$feed = new Feed();
$this->findFeedUrl($xml, $feed);
$this->checkFeedUrl($feed);
$this->findSiteUrl($xml, $feed);
$this->checkSiteUrl($feed);
$this->findFeedTitle($xml, $feed);
$this->findFeedDescription($xml, $feed);
$this->findFeedLanguage($xml, $feed);
$this->findFeedId($xml, $feed);
$this->findFeedDate($xml, $feed);
$this->findFeedLogo($xml, $feed);
$this->findFeedIcon($xml, $feed);
foreach ($this->getItemsTree($xml) as $entry) {
$entry = $this->registerSupportedNamespaces($entry);
$item = new Item();
$item->xml = $entry;
$item->namespaces = $this->used_namespaces;
$this->findItemAuthor($xml, $entry, $item);
$this->findItemUrl($entry, $item);
$this->checkItemUrl($feed, $item);
$this->findItemTitle($entry, $item);
$this->findItemContent($entry, $item);
// Id generation can use the item url/title/content (order is important)
$this->findItemId($entry, $item, $feed);
$this->findItemDate($entry, $item, $feed);
$this->findItemEnclosure($entry, $item, $feed);
$this->findItemLanguage($entry, $item, $feed);
$this->findItemCategories($entry, $item, $feed);
$this->itemPostProcessor->execute($feed, $item);
$feed->items[] = $item;
}
Logger::setMessage(get_called_class().PHP_EOL.$feed);
return $feed;
}
/**
* Check if the feed url is correct.
*
* @param Feed $feed Feed object
*/
public function checkFeedUrl(Feed $feed)
{
if ($feed->getFeedUrl() === '') {
$feed->feedUrl = $this->fallback_url;
} else {
$feed->feedUrl = Url::resolve($feed->getFeedUrl(), $this->fallback_url);
}
}
/**
* Check if the site url is correct.
*
* @param Feed $feed Feed object
*/
public function checkSiteUrl(Feed $feed)
{
if ($feed->getSiteUrl() === '') {
$feed->siteUrl = Url::base($feed->getFeedUrl());
} else {
$feed->siteUrl = Url::resolve($feed->getSiteUrl(), $this->fallback_url);
}
}
/**
* Check if the item url is correct.
*
* @param Feed $feed Feed object
* @param Item $item Item object
*/
public function checkItemUrl(Feed $feed, Item $item)
{
$item->url = Url::resolve($item->getUrl(), $feed->getSiteUrl());
}
/**
* Find the item date.
*
* @param SimpleXMLElement $entry Feed item
* @param Item $item Item object
* @param \PicoFeed\Parser\Feed $feed Feed object
*/
public function findItemDate(SimpleXMLElement $entry, Item $item, Feed $feed)
{
$this->findItemPublishedDate($entry, $item, $feed);
$this->findItemUpdatedDate($entry, $item, $feed);
if ($item->getPublishedDate() === null) {
// Use the updated date if available, otherwise use the feed date
$item->setPublishedDate($item->getUpdatedDate() ?: $feed->getDate());
}
if ($item->getUpdatedDate() === null) {
// Use the published date as fallback
$item->setUpdatedDate($item->getPublishedDate());
}
// Use the most recent of published and updated dates
$item->setDate(max($item->getPublishedDate(), $item->getUpdatedDate()));
}
/**
* Get Item Post Processor instance
*
* @access public
* @return ItemPostProcessor
*/
public function getItemPostProcessor()
{
return $this->itemPostProcessor;
}
/**
* Get DateParser instance
*
* @access public
* @return DateParser
*/
public function getDateParser()
{
if ($this->dateParser === null) {
$this->dateParser = new DateParser($this->config);
}
return $this->dateParser;
}
/**
* Generate a unique id for an entry (hash all arguments).
*
* @return string
*/
public function generateId()
{
return hash($this->hash_algo, implode(func_get_args()));
}
/**
* Return true if the given language is "Right to Left".
*
* @static
* @param string $language Language: fr-FR, en-US
* @return bool
*/
public static function isLanguageRTL($language)
{
$language = strtolower($language);
$rtl_languages = array(
'ar', // Arabic (ar-**)
'fa', // Farsi (fa-**)
'ur', // Urdu (ur-**)
'ps', // Pashtu (ps-**)
'syr', // Syriac (syr-**)
'dv', // Divehi (dv-**)
'he', // Hebrew (he-**)
'yi', // Yiddish (yi-**)
);
foreach ($rtl_languages as $prefix) {
if (strpos($language, $prefix) === 0) {
return true;
}
}
return false;
}
/**
* Set Hash algorithm used for id generation.
*
* @param string $algo Algorithm name
* @return \PicoFeed\Parser\Parser
*/
public function setHashAlgo($algo)
{
$this->hash_algo = $algo ?: $this->hash_algo;
return $this;
}
/**
* Set config object.
*
* @param \PicoFeed\Config\Config $config Config instance
* @return \PicoFeed\Parser\Parser
*/
public function setConfig($config)
{
$this->config = $config;
$this->itemPostProcessor->setConfig($config);
return $this;
}
/**
* Enable the content grabber.
*
* @return \PicoFeed\Parser\Parser
*/
public function disableContentFiltering()
{
$this->itemPostProcessor->unregister('PicoFeed\Processor\ContentFilterProcessor');
return $this;
}
/**
* Enable the content grabber.
*
* @param bool $needsRuleFile true if only pages with rule files should be
* scraped
* @param null|\Closure $scraperCallback Callback function that gets called for each
* scraper execution
* @return \PicoFeed\Parser\Parser
*/
public function enableContentGrabber($needsRuleFile = false, $scraperCallback = null)
{
$processor = new ScraperProcessor($this->config);
if ($needsRuleFile) {
$processor->getScraper()->disableCandidateParser();
}
if ($scraperCallback !== null) {
$processor->setExecutionCallback($scraperCallback);
}
$this->itemPostProcessor->register($processor);
return $this;
}
/**
* Set ignored URLs for the content grabber.
*
* @param array $urls URLs
* @return \PicoFeed\Parser\Parser
*/
public function setGrabberIgnoreUrls(array $urls)
{
$this->itemPostProcessor->getProcessor('PicoFeed\Processor\ScraperProcessor')->ignoreUrls($urls);
return $this;
}
/**
* Register all supported namespaces to be used within an xpath query.
*
* @param SimpleXMLElement $xml Feed xml
* @return SimpleXMLElement
*/
public function registerSupportedNamespaces(SimpleXMLElement $xml)
{
foreach ($this->namespaces as $prefix => $ns) {
$xml->registerXPathNamespace($prefix, $ns);
}
return $xml;
}
}