WordPress/wp-includes/SimplePie/Locator.php
Andrew Nacin 405a995659 Update to SimplePie 1.3. props rmccue.
Uses individual files for each class. We now conditionally load only the pieces
we need, resulting in less memory usage. Also easier to maintain now that it is
not a single 387KB file.

fixes #21183.



git-svn-id: http://core.svn.wordpress.org/trunk@21644 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2012-08-28 17:24:33 +00:00

339 lines
10 KiB
PHP
Executable File

<?php
/**
* SimplePie
*
* A PHP-Based RSS and Atom Feed Framework.
* Takes the hard work out of managing a complete RSS/Atom solution.
*
* Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* * Neither the name of the SimplePie Team nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package SimplePie
* @version 1.3
* @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
* @author Ryan Parman
* @author Geoffrey Sneddon
* @author Ryan McCue
* @link http://simplepie.org/ SimplePie
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
*/
/**
* Used for feed auto-discovery
*
*
* This class can be overloaded with {@see SimplePie::set_locator_class()}
*
* @package SimplePie
*/
class SimplePie_Locator
{
var $useragent;
var $timeout;
var $file;
var $local = array();
var $elsewhere = array();
var $cached_entities = array();
var $http_base;
var $base;
var $base_location = 0;
var $checked_feeds = 0;
var $max_checked_feeds = 10;
protected $registry;
public function __construct(SimplePie_File $file, $timeout = 10, $useragent = null, $max_checked_feeds = 10)
{
$this->file = $file;
$this->useragent = $useragent;
$this->timeout = $timeout;
$this->max_checked_feeds = $max_checked_feeds;
$this->dom = new DOMDocument();
set_error_handler(array('SimplePie_Misc', 'silence_errors'));
$this->dom->loadHTML($this->file->body);
restore_error_handler();
}
public function set_registry(SimplePie_Registry $registry)
{
$this->registry = $registry;
}
public function find($type = SIMPLEPIE_LOCATOR_ALL, &$working)
{
if ($this->is_feed($this->file))
{
return $this->file;
}
if ($this->file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
{
$sniffer = $this->registry->create('Content_Type_Sniffer', array($this->file));
if ($sniffer->get_type() !== 'text/html')
{
return null;
}
}
if ($type & ~SIMPLEPIE_LOCATOR_NONE)
{
$this->get_base();
}
if ($type & SIMPLEPIE_LOCATOR_AUTODISCOVERY && $working = $this->autodiscovery())
{
return $working[0];
}
if ($type & (SIMPLEPIE_LOCATOR_LOCAL_EXTENSION | SIMPLEPIE_LOCATOR_LOCAL_BODY | SIMPLEPIE_LOCATOR_REMOTE_EXTENSION | SIMPLEPIE_LOCATOR_REMOTE_BODY) && $this->get_links())
{
if ($type & SIMPLEPIE_LOCATOR_LOCAL_EXTENSION && $working = $this->extension($this->local))
{
return $working;
}
if ($type & SIMPLEPIE_LOCATOR_LOCAL_BODY && $working = $this->body($this->local))
{
return $working;
}
if ($type & SIMPLEPIE_LOCATOR_REMOTE_EXTENSION && $working = $this->extension($this->elsewhere))
{
return $working;
}
if ($type & SIMPLEPIE_LOCATOR_REMOTE_BODY && $working = $this->body($this->elsewhere))
{
return $working;
}
}
return null;
}
public function is_feed($file)
{
if ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
{
$sniffer = $this->registry->create('Content_Type_Sniffer', array($file));
$sniffed = $sniffer->get_type();
if (in_array($sniffed, array('application/rss+xml', 'application/rdf+xml', 'text/rdf', 'application/atom+xml', 'text/xml', 'application/xml')))
{
return true;
}
else
{
return false;
}
}
elseif ($file->method & SIMPLEPIE_FILE_SOURCE_LOCAL)
{
return true;
}
else
{
return false;
}
}
public function get_base()
{
$this->http_base = $this->file->url;
$this->base = $this->http_base;
$elements = $this->dom->getElementsByTagName('base');
foreach ($elements as $element)
{
if ($element->hasAttribute('href'))
{
$this->base = $this->registry->call('Misc', 'absolutize_url', array(trim($element->getAttribute('href')), $this->http_base));
$this->base_location = method_exists($element, 'getLineNo') ? $element->getLineNo() : 0;
break;
}
}
}
public function autodiscovery()
{
$done = array();
$feeds = array();
$feeds = array_merge($feeds, $this->search_elements_by_tag('link', $done, $feeds));
$feeds = array_merge($feeds, $this->search_elements_by_tag('a', $done, $feeds));
$feeds = array_merge($feeds, $this->search_elements_by_tag('area', $done, $feeds));
if (!empty($feeds))
{
return array_values($feeds);
}
else
{
return null;
}
}
protected function search_elements_by_tag($name, &$done, $feeds)
{
$links = $this->dom->getElementsByTagName($name);
foreach ($links as $link)
{
if ($this->checked_feeds === $this->max_checked_feeds)
{
break;
}
if ($link->hasAttribute('href') && $link->hasAttribute('rel'))
{
$rel = array_unique($this->registry->call('Misc', 'space_seperated_tokens', array(strtolower($link->getAttribute('rel')))));
$line = method_exists($link, 'getLineNo') ? $link->getLineNo() : 1;
if ($this->base_location < $line)
{
$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
}
else
{
$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
}
if (!in_array($href, $done) && in_array('feed', $rel) || (in_array('alternate', $rel) && !in_array('stylesheet', $rel) && $link->hasAttribute('type') && in_array(strtolower($this->registry->call('Misc', 'parse_mime', array($link->getAttribute('type')))), array('application/rss+xml', 'application/atom+xml'))) && !isset($feeds[$href]))
{
$this->checked_feeds++;
$headers = array(
'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
);
$feed = $this->registry->create('File', array($href, $this->timeout, 5, $headers, $this->useragent));
if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
{
$feeds[$href] = $feed;
}
}
$done[] = $href;
}
}
return $feeds;
}
public function get_links()
{
$links = $this->dom->getElementsByTagName('a');
foreach ($links as $link)
{
if ($link->hasAttribute('href'))
{
$href = trim($link->getAttribute('href'));
$parsed = $this->registry->call('Misc', 'parse_url', array($href));
if ($parsed['scheme'] === '' || preg_match('/^(http(s)|feed)?$/i', $parsed['scheme']))
{
if ($this->base_location < $link->getLineNo())
{
$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
}
else
{
$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
}
$current = $this->registry->call('Misc', 'parse_url', array($this->file->url));
if ($parsed['authority'] === '' || $parsed['authority'] === $current['authority'])
{
$this->local[] = $href;
}
else
{
$this->elsewhere[] = $href;
}
}
}
}
$this->local = array_unique($this->local);
$this->elsewhere = array_unique($this->elsewhere);
if (!empty($this->local) || !empty($this->elsewhere))
{
return true;
}
return null;
}
public function extension(&$array)
{
foreach ($array as $key => $value)
{
if ($this->checked_feeds === $this->max_checked_feeds)
{
break;
}
if (in_array(strtolower(strrchr($value, '.')), array('.rss', '.rdf', '.atom', '.xml')))
{
$this->checked_feeds++;
$headers = array(
'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
);
$feed = $this->registry->create('File', array($value, $this->timeout, 5, $headers, $this->useragent));
if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
{
return $feed;
}
else
{
unset($array[$key]);
}
}
}
return null;
}
public function body(&$array)
{
foreach ($array as $key => $value)
{
if ($this->checked_feeds === $this->max_checked_feeds)
{
break;
}
if (preg_match('/(rss|rdf|atom|xml)/i', $value))
{
$this->checked_feeds++;
$headers = array(
'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
);
$feed = $this->registry->create('File', array($value, $this->timeout, 5, null, $this->useragent));
if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
{
return $feed;
}
else
{
unset($array[$key]);
}
}
}
return null;
}
}