<?php
/**
* SimplePie
*
* A PHP-Based RSS and Atom Feed Framework.
* Takes the hard work out of managing a complete RSS/Atom solution.
*
* Copyright (c) 2004-2009, 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-dev
* @copyright 2004-2010 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
* @todo phpDoc comments
*/
class SimplePie_Locator
{
var $useragent;
var $timeout;
var $file;
var $local = array();
var $elsewhere = array();
var $file_class = 'SimplePie_File';
var $cached_entities = array();
var $http_base;
var $base;
var $base_location = 0;
var $checked_feeds = 0;
var $max_checked_feeds = 10;
var $content_type_sniffer_class = 'SimplePie_Content_Type_Sniffer';
public function __construct(&$file, $timeout = 10, $useragent = null, $file_class = 'SimplePie_File', $max_checked_feeds = 10, $content_type_sniffer_class = 'SimplePie_Content_Type_Sniffer')
{
$this->file =& $file;
$this->file_class = $file_class;
$this->useragent = $useragent;
$this->timeout = $timeout;
$this->max_checked_feeds = $max_checked_feeds;
$this->content_type_sniffer_class = $content_type_sniffer_class;
}
public function find($type = SIMPLEPIE_LOCATOR_ALL, &$working)
{
if ($this->is_feed($this->file))
{
return $this->file;
}
if ($this->file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
{
$sniffer = new $this->content_type_sniffer_class($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 = new $this->content_type_sniffer_class($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 = SimplePie_Misc::get_element('base', $this->file->body);
foreach ($elements as $element)
{
if ($element['attribs']['href']['data'] !== '')
{
$this->base = SimplePie_Misc::absolutize_url(trim($element['attribs']['href']['data']), $this->http_base);
$this->base_location = $element['offset'];
break;
}
}
}
public function autodiscovery()
{
$links = array_merge(SimplePie_Misc::get_element('link', $this->file->body), SimplePie_Misc::get_element('a', $this->file->body), SimplePie_Misc::get_element('area', $this->file->body));
$done = array();
$feeds = array();
foreach ($links as $link)
{
if ($this->checked_feeds === $this->max_checked_feeds)
{
break;
}
if (isset($link['attribs']['href']['data']) && isset($link['attribs']['rel']['data']))
{
$rel = array_unique(SimplePie_Misc::space_seperated_tokens(strtolower($link['attribs']['rel']['data'])));
if ($this->base_location < $link['offset'])
{
$href = SimplePie_Misc::absolutize_url(trim($link['attribs']['href']['data']), $this->base);
}
else
{
$href = SimplePie_Misc::absolutize_url(trim($link['attribs']['href']['data']), $this->http_base);
}
if (!in_array($href, $done) && in_array('feed', $rel) || (in_array('alternate', $rel) && !in_array('stylesheet', $rel) && !empty($link['attribs']['type']['data']) && in_array(strtolower(SimplePie_Misc::parse_mime($link['attribs']['type']['data'])), array('application/rss+xml', 'application/atom+xml'))) && !isset($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 = new $this->file_class($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[] = $href;
}
}
if (!empty($feeds))
{
return array_values($feeds);
}
else
{
return null;
}
}
public function get_links()
{
$links = SimplePie_Misc::get_element('a', $this->file->body);
foreach ($links as $link)
{
if (isset($link['attribs']['href']['data']))
{
$href = trim($link['attribs']['href']['data']);
$parsed = SimplePie_Misc::parse_url($href);
if ($parsed['scheme'] === '' || preg_match('/^(http(s)|feed)?$/i', $parsed['scheme']))
{
if ($this->base_location < $link['offset'])
{
$href = SimplePie_Misc::absolutize_url(trim($link['attribs']['href']['data']), $this->base);
}
else
{
$href = SimplePie_Misc::absolutize_url(trim($link['attribs']['href']['data']), $this->http_base);
}
$current = SimplePie_Misc::parse_url($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 = new $this->file_class($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 = new $this->file_class($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;
}
}
