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<?php
namespace PicoFeed\Reader;
use DOMXPath;
use PicoFeed\Config\Config;
use PicoFeed\Client\Client;
use PicoFeed\Client\Url;
use PicoFeed\Logging\Logger;
use PicoFeed\Filter\Filter;
use PicoFeed\Parser\XmlParser;
/**
* Reader class
*
* @author Frederic Guillot
* @package Reader
*/
class Reader
{
/**
* Feed formats for detection
*
* @access private
* @var array
*/
private $formats = array(
'Atom' => array('<feed'),
'Rss20' => array('<rss', '2.0'),
'Rss92' => array('<rss', '0.92'),
'Rss91' => array('<rss', '0.91'),
'Rss10' => array('<rdf:'),
);
/**
* Config class instance
*
* @access private
* @var \PicoFeed\Config\Config
*/
private $config;
/**
* Constructor
*
* @access public
* @param \PicoFeed\Config $config Config class instance
*/
public function __construct(Config $config = null)
{
$this->config = $config ?: new Config;
Logger::setTimezone($this->config->getTimezone());
}
/**
* Download a feed (no discovery)
*
* @access public
* @param string $url Feed url
* @param string $last_modified Last modified HTTP header
* @param string $etag Etag HTTP header
* @return \PicoFeed\Client\Client
*/
public function download($url, $last_modified = '', $etag = '')
{
$url = $this->prependScheme($url);
return Client::getInstance()
->setConfig($this->config)
->setLastModified($last_modified)
->setEtag($etag)
->execute($url);
}
/**
* Discover and download a feed
*
* @access public
* @param string $url Feed or website url
* @param string $last_modified Last modified HTTP header
* @param string $etag Etag HTTP header
* @return \PicoFeed\Client\Client
*/
public function discover($url, $last_modified = '', $etag = '')
{
$client = $this->download($url, $last_modified, $etag);
// It's already a feed
if ($this->detectFormat($client->getContent())) {
return $client;
}
// Try to find a subscription
$links = $this->find($client->getUrl(), $client->getContent());
if (empty($links)) {
throw new SubscriptionNotFoundException('Unable to find a subscription');
}
return $this->download($links[0], $last_modified, $etag);
}
/**
* Find feed urls inside a HTML document
*
* @access public
* @param string $url Website url
* @param string $html HTML content
* @return array List of feed links
*/
public function find($url, $html)
{
Logger::setMessage(get_called_class().': Try to discover subscriptions');
$dom = XmlParser::getHtmlDocument($html);
$xpath = new DOMXPath($dom);
$links = array();
$queries = array(
'//link[@type="application/rss+xml"]',
'//link[@type="application/atom+xml"]',
);
foreach ($queries as $query) {
$nodes = $xpath->query($query);
foreach ($nodes as $node) {
$link = $node->getAttribute('href');
if (! empty($link)) {
$feedUrl = new Url($link);
$siteUrl = new Url($url);
$links[] = $feedUrl->getAbsoluteUrl($feedUrl->isRelativeUrl() ? $siteUrl->getBaseUrl() : '');
}
}
}
Logger::setMessage(get_called_class().': '.implode(', ', $links));
return $links;
}
/**
* Get a parser instance
*
* @access public
* @param string $url Site url
* @param string $content Feed content
* @param string $encoding HTTP encoding
* @return \PicoFeed\Parser\Parser
*/
public function getParser($url, $content, $encoding)
{
$format = $this->detectFormat($content);
if (empty($format)) {
throw new UnsupportedFeedFormatException('Unable to detect feed format');
}
$className = '\PicoFeed\Parser\\'.$format;
$parser = new $className($content, $encoding, $url);
$parser->setHashAlgo($this->config->getParserHashAlgo());
$parser->setTimezone($this->config->getTimezone());
$parser->setConfig($this->config);
return $parser;
}
/**
* Detect the feed format
*
* @access public
* @param string $content Feed content
* @return string
*/
public function detectFormat($content)
{
$first_tag = Filter::getFirstTag($content);
Logger::setMessage(get_called_class().': DetectFormat(): '.$first_tag);
foreach ($this->formats as $parser => $needles) {
if ($this->contains($first_tag, $needles)) {
return $parser;
}
}
return '';
}
/**
* Return true if all needles are found in the haystack
*
* @access private
* @param string $haystack Haystack
* @param string $needles Needles to find
* @return boolean
*/
private function contains($haystack, array $needles)
{
$results = array();
foreach ($needles as $needle) {
$results[] = strpos($haystack, $needle) !== false;
}
return ! in_array(false, $results, true);
}
/**
* Add the prefix "http://" if the end-user just enter a domain name
*
* @access public
* @param string $url Url
* @retunr string
*/
public function prependScheme($url)
{
if (! preg_match('%^https?://%', $url)) {
$url = 'http://' . $url;
}
return $url;
}
}
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