404 lines
11 KiB
PHP
404 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 \PicoFeed\Parser\Feed
|
|
*/
|
|
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);
|
|
|
|
$this->itemPostProcessor->execute($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;
|
|
}
|
|
|
|
|
|
}
|