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<?php
namespace PicoFeed\Reader;
use DOMXPath;
use PicoFeed\Base;
use PicoFeed\Client\Client;
use PicoFeed\Client\Url;
use PicoFeed\Logging\Logger;
use PicoFeed\Parser\XmlParser;
/**
* Reader class.
*
* @author Frederic Guillot
*/
class Reader extends Base
{
/**
* Feed formats for detection.
*
* @var array
*/
private $formats = array(
'Atom' => '//feed',
'Rss20' => '//rss[@version="2.0"]',
'Rss92' => '//rss[@version="0.92"]',
'Rss91' => '//rss[@version="0.91"]',
'Rss10' => '//rdf',
);
/**
* Download a feed (no discovery).
*
* @param string $url Feed url
* @param string $last_modified Last modified HTTP header
* @param string $etag Etag HTTP header
* @param string $username HTTP basic auth username
* @param string $password HTTP basic auth password
*
* @return \PicoFeed\Client\Client
*/
public function download($url, $last_modified = '', $etag = '', $username = '', $password = '')
{
$url = $this->prependScheme($url);
return Client::getInstance()
->setConfig($this->config)
->setLastModified($last_modified)
->setEtag($etag)
->setUsername($username)
->setPassword($password)
->execute($url);
}
/**
* Discover and download a feed.
*
* @param string $url Feed or website url
* @param string $last_modified Last modified HTTP header
* @param string $etag Etag HTTP header
* @param string $username HTTP basic auth username
* @param string $password HTTP basic auth password
* @return Client
* @throws SubscriptionNotFoundException
*/
public function discover($url, $last_modified = '', $etag = '', $username = '', $password = '')
{
$client = $this->download($url, $last_modified, $etag, $username, $password);
// It's already a feed or the feed was not modified
if (!$client->isModified() || $this->detectFormat($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, $username, $password);
}
/**
* Find feed urls inside a HTML document.
*
* @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.
*
* @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());
$parser->setConfig($this->config);
return $parser;
}
/**
* Detect the feed format.
*
* @param string $content Feed content
*
* @return string
*/
public function detectFormat($content)
{
$dom = XmlParser::getHtmlDocument($content);
$xpath = new DOMXPath($dom);
foreach ($this->formats as $parser_name => $query) {
$nodes = $xpath->query($query);
if ($nodes->length === 1) {
return $parser_name;
}
}
return '';
}
/**
* Add the prefix "http://" if the end-user just enter a domain name.
*
* @param string $url Url
* @retunr string
*/
public function prependScheme($url)
{
if (!preg_match('%^https?://%', $url)) {
$url = 'http://'.$url;
}
return $url;
}
}
|
