373 lines
11 KiB
PHP
373 lines
11 KiB
PHP
<?php
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/**
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* SimplePie
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*
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* A PHP-Based RSS and Atom Feed Framework.
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* Takes the hard work out of managing a complete RSS/Atom solution.
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*
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* Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* * Neither the name of the SimplePie Team nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
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* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package SimplePie
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* @version 1.3.1
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* @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
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* @author Ryan Parman
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* @author Geoffrey Sneddon
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* @author Ryan McCue
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* @link http://simplepie.org/ SimplePie
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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/**
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* Used for feed auto-discovery
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*
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*
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* This class can be overloaded with {@see SimplePie::set_locator_class()}
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*
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* @package SimplePie
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*/
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class SimplePie_Locator
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{
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var $useragent;
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var $timeout;
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var $file;
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var $local = array();
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var $elsewhere = array();
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var $cached_entities = array();
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var $http_base;
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var $base;
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var $base_location = 0;
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var $checked_feeds = 0;
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var $max_checked_feeds = 10;
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protected $registry;
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public function __construct(SimplePie_File $file, $timeout = 10, $useragent = null, $max_checked_feeds = 10)
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{
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$this->file = $file;
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$this->useragent = $useragent;
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$this->timeout = $timeout;
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$this->max_checked_feeds = $max_checked_feeds;
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if (class_exists('DOMDocument'))
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{
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$this->dom = new DOMDocument();
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set_error_handler(array('SimplePie_Misc', 'silence_errors'));
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$this->dom->loadHTML($this->file->body);
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restore_error_handler();
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}
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else
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{
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$this->dom = null;
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}
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}
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public function set_registry(SimplePie_Registry $registry)
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{
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$this->registry = $registry;
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}
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public function find($type = SIMPLEPIE_LOCATOR_ALL, &$working)
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{
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if ($this->is_feed($this->file))
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{
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return $this->file;
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}
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if ($this->file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
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{
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$sniffer = $this->registry->create('Content_Type_Sniffer', array($this->file));
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if ($sniffer->get_type() !== 'text/html')
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{
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return null;
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}
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}
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if ($type & ~SIMPLEPIE_LOCATOR_NONE)
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{
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$this->get_base();
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}
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if ($type & SIMPLEPIE_LOCATOR_AUTODISCOVERY && $working = $this->autodiscovery())
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{
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return $working[0];
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}
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if ($type & (SIMPLEPIE_LOCATOR_LOCAL_EXTENSION | SIMPLEPIE_LOCATOR_LOCAL_BODY | SIMPLEPIE_LOCATOR_REMOTE_EXTENSION | SIMPLEPIE_LOCATOR_REMOTE_BODY) && $this->get_links())
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{
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if ($type & SIMPLEPIE_LOCATOR_LOCAL_EXTENSION && $working = $this->extension($this->local))
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{
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return $working;
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}
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if ($type & SIMPLEPIE_LOCATOR_LOCAL_BODY && $working = $this->body($this->local))
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{
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return $working;
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}
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if ($type & SIMPLEPIE_LOCATOR_REMOTE_EXTENSION && $working = $this->extension($this->elsewhere))
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{
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return $working;
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}
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if ($type & SIMPLEPIE_LOCATOR_REMOTE_BODY && $working = $this->body($this->elsewhere))
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{
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return $working;
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}
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}
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return null;
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}
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public function is_feed($file)
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{
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if ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
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{
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$sniffer = $this->registry->create('Content_Type_Sniffer', array($file));
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$sniffed = $sniffer->get_type();
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if (in_array($sniffed, array('application/rss+xml', 'application/rdf+xml', 'text/rdf', 'application/atom+xml', 'text/xml', 'application/xml')))
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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elseif ($file->method & SIMPLEPIE_FILE_SOURCE_LOCAL)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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public function get_base()
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{
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if ($this->dom === null)
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{
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throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
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}
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$this->http_base = $this->file->url;
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$this->base = $this->http_base;
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$elements = $this->dom->getElementsByTagName('base');
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foreach ($elements as $element)
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{
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if ($element->hasAttribute('href'))
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{
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$base = $this->registry->call('Misc', 'absolutize_url', array(trim($element->getAttribute('href')), $this->http_base));
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if ($base === false)
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{
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continue;
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}
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$this->base = $base;
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$this->base_location = method_exists($element, 'getLineNo') ? $element->getLineNo() : 0;
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break;
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}
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}
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}
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public function autodiscovery()
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{
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$done = array();
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$feeds = array();
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$feeds = array_merge($feeds, $this->search_elements_by_tag('link', $done, $feeds));
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$feeds = array_merge($feeds, $this->search_elements_by_tag('a', $done, $feeds));
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$feeds = array_merge($feeds, $this->search_elements_by_tag('area', $done, $feeds));
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if (!empty($feeds))
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{
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return array_values($feeds);
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}
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else
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{
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return null;
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}
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}
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protected function search_elements_by_tag($name, &$done, $feeds)
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{
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if ($this->dom === null)
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{
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throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
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}
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$links = $this->dom->getElementsByTagName($name);
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foreach ($links as $link)
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{
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if ($this->checked_feeds === $this->max_checked_feeds)
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{
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break;
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}
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if ($link->hasAttribute('href') && $link->hasAttribute('rel'))
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{
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$rel = array_unique($this->registry->call('Misc', 'space_seperated_tokens', array(strtolower($link->getAttribute('rel')))));
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$line = method_exists($link, 'getLineNo') ? $link->getLineNo() : 1;
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if ($this->base_location < $line)
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{
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$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
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}
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else
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{
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$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
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}
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if ($href === false)
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{
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continue;
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}
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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[$href]))
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{
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$this->checked_feeds++;
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$headers = array(
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'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
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);
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$feed = $this->registry->create('File', array($href, $this->timeout, 5, $headers, $this->useragent));
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if ($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))
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{
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$feeds[$href] = $feed;
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}
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}
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$done[] = $href;
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}
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}
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return $feeds;
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}
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public function get_links()
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{
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if ($this->dom === null)
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{
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throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
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}
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$links = $this->dom->getElementsByTagName('a');
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foreach ($links as $link)
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{
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if ($link->hasAttribute('href'))
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{
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$href = trim($link->getAttribute('href'));
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$parsed = $this->registry->call('Misc', 'parse_url', array($href));
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if ($parsed['scheme'] === '' || preg_match('/^(http(s)|feed)?$/i', $parsed['scheme']))
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{
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if (method_exists($link, 'getLineNo') && $this->base_location < $link->getLineNo())
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{
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$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
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}
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else
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{
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$href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
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}
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if ($href === false)
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{
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continue;
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}
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$current = $this->registry->call('Misc', 'parse_url', array($this->file->url));
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if ($parsed['authority'] === '' || $parsed['authority'] === $current['authority'])
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{
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$this->local[] = $href;
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}
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else
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{
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$this->elsewhere[] = $href;
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}
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}
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}
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}
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$this->local = array_unique($this->local);
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$this->elsewhere = array_unique($this->elsewhere);
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if (!empty($this->local) || !empty($this->elsewhere))
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{
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return true;
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}
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return null;
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}
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public function extension(&$array)
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{
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foreach ($array as $key => $value)
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{
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if ($this->checked_feeds === $this->max_checked_feeds)
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{
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break;
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}
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if (in_array(strtolower(strrchr($value, '.')), array('.rss', '.rdf', '.atom', '.xml')))
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{
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$this->checked_feeds++;
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$headers = array(
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'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',
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);
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$feed = $this->registry->create('File', array($value, $this->timeout, 5, $headers, $this->useragent));
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if ($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))
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{
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return $feed;
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}
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else
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{
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unset($array[$key]);
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}
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}
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}
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return null;
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}
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public function body(&$array)
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{
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foreach ($array as $key => $value)
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{
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if ($this->checked_feeds === $this->max_checked_feeds)
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{
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break;
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}
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if (preg_match('/(rss|rdf|atom|xml)/i', $value))
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{
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$this->checked_feeds++;
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$headers = array(
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'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
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);
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$feed = $this->registry->create('File', array($value, $this->timeout, 5, null, $this->useragent));
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if ($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))
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{
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return $feed;
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}
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else
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{
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unset($array[$key]);
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}
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}
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}
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return null;
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}
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}
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