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/**
 * SimplePie
 *
 * A PHP-Based RSS and Atom Feed Framework.
 * Takes the hard work out of managing a complete RSS/Atom solution.
 *
 * Copyright (c) 2004-2016, Ryan Parman, Sam 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 &quot;AS IS&quot; 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
 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
 * @author Ryan Parman
 * @author Sam 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;
	var $force_fsockopen = false;
	var $curl_options = array();
	var $dom;
	protected $registry;

	public function __construct(SimplePie_File $file, $timeout = 10, $useragent = null, $max_checked_feeds = 10, $force_fsockopen = false, $curl_options = array())
	{
		$this-&gt;file = $file;
		$this-&gt;useragent = $useragent;
		$this-&gt;timeout = $timeout;
		$this-&gt;max_checked_feeds = $max_checked_feeds;
		$this-&gt;force_fsockopen = $force_fsockopen;
		$this-&gt;curl_options = $curl_options;

		if (class_exists(&#039;DOMDocument&#039;) &amp;&amp; $this-&gt;file-&gt;body != &#039;&#039;)
		{
			$this-&gt;dom = new DOMDocument();

			set_error_handler(array(&#039;SimplePie_Misc&#039;, &#039;silence_errors&#039;));
			try
			{
				$this-&gt;dom-&gt;loadHTML($this-&gt;file-&gt;body);
			}
			catch (Throwable $ex)
			{
				$this-&gt;dom = null;
			}
			restore_error_handler();
		}
		else
		{
			$this-&gt;dom = null;
		}
	}

	public function set_registry(SimplePie_Registry $registry)
	{
		$this-&gt;registry = $registry;
	}

	public function find($type = SIMPLEPIE_LOCATOR_ALL, &amp;$working = null)
	{
		if ($this-&gt;is_feed($this-&gt;file))
		{
			return $this-&gt;file;
		}

		if ($this-&gt;file-&gt;method &amp; SIMPLEPIE_FILE_SOURCE_REMOTE)
		{
			$sniffer = $this-&gt;registry-&gt;create(&#039;Content_Type_Sniffer&#039;, array($this-&gt;file));
			if ($sniffer-&gt;get_type() !== &#039;text/html&#039;)
			{
				return null;
			}
		}

		if ($type &amp; ~SIMPLEPIE_LOCATOR_NONE)
		{
			$this-&gt;get_base();
		}

		if ($type &amp; SIMPLEPIE_LOCATOR_AUTODISCOVERY &amp;&amp; $working = $this-&gt;autodiscovery())
		{
			return $working[0];
		}

		if ($type &amp; (SIMPLEPIE_LOCATOR_LOCAL_EXTENSION | SIMPLEPIE_LOCATOR_LOCAL_BODY | SIMPLEPIE_LOCATOR_REMOTE_EXTENSION | SIMPLEPIE_LOCATOR_REMOTE_BODY) &amp;&amp; $this-&gt;get_links())
		{
			if ($type &amp; SIMPLEPIE_LOCATOR_LOCAL_EXTENSION &amp;&amp; $working = $this-&gt;extension($this-&gt;local))
			{
				return $working[0];
			}

			if ($type &amp; SIMPLEPIE_LOCATOR_LOCAL_BODY &amp;&amp; $working = $this-&gt;body($this-&gt;local))
			{
				return $working[0];
			}

			if ($type &amp; SIMPLEPIE_LOCATOR_REMOTE_EXTENSION &amp;&amp; $working = $this-&gt;extension($this-&gt;elsewhere))
			{
				return $working[0];
			}

			if ($type &amp; SIMPLEPIE_LOCATOR_REMOTE_BODY &amp;&amp; $working = $this-&gt;body($this-&gt;elsewhere))
			{
				return $working[0];
			}
		}
		return null;
	}

	public function is_feed($file, $check_html = false)
	{
		if ($file-&gt;method &amp; SIMPLEPIE_FILE_SOURCE_REMOTE)
		{
			$sniffer = $this-&gt;registry-&gt;create(&#039;Content_Type_Sniffer&#039;, array($file));
			$sniffed = $sniffer-&gt;get_type();
			$mime_types = array(&#039;application/rss+xml&#039;, &#039;application/rdf+xml&#039;,
			                    &#039;text/rdf&#039;, &#039;application/atom+xml&#039;, &#039;text/xml&#039;,
			                    &#039;application/xml&#039;, &#039;application/x-rss+xml&#039;);
			if ($check_html)
			{
				$mime_types[] = &#039;text/html&#039;;
			}

			return in_array($sniffed, $mime_types);
		}
		elseif ($file-&gt;method &amp; SIMPLEPIE_FILE_SOURCE_LOCAL)
		{
			return true;
		}
		else
		{
			return false;
		}
	}

	public function get_base()
	{
		if ($this-&gt;dom === null)
		{
			throw new SimplePie_Exception(&#039;DOMDocument not found, unable to use locator&#039;);
		}
		$this-&gt;http_base = $this-&gt;file-&gt;url;
		$this-&gt;base = $this-&gt;http_base;
		$elements = $this-&gt;dom-&gt;getElementsByTagName(&#039;base&#039;);
		foreach ($elements as $element)
		{
			if ($element-&gt;hasAttribute(&#039;href&#039;))
			{
				$base = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;absolutize_url&#039;, array(trim($element-&gt;getAttribute(&#039;href&#039;)), $this-&gt;http_base));
				if ($base === false)
				{
					continue;
				}
				$this-&gt;base = $base;
				$this-&gt;base_location = method_exists($element, &#039;getLineNo&#039;) ? $element-&gt;getLineNo() : 0;
				break;
			}
		}
	}

	public function autodiscovery()
	{
		$done = array();
		$feeds = array();
		$feeds = array_merge($feeds, $this-&gt;search_elements_by_tag(&#039;link&#039;, $done, $feeds));
		$feeds = array_merge($feeds, $this-&gt;search_elements_by_tag(&#039;a&#039;, $done, $feeds));
		$feeds = array_merge($feeds, $this-&gt;search_elements_by_tag(&#039;area&#039;, $done, $feeds));

		if (!empty($feeds))
		{
			return array_values($feeds);
		}

		return null;
	}

	protected function search_elements_by_tag($name, &amp;$done, $feeds)
	{
		if ($this-&gt;dom === null)
		{
			throw new SimplePie_Exception(&#039;DOMDocument not found, unable to use locator&#039;);
		}

		$links = $this-&gt;dom-&gt;getElementsByTagName($name);
		foreach ($links as $link)
		{
			if ($this-&gt;checked_feeds === $this-&gt;max_checked_feeds)
			{
				break;
			}
			if ($link-&gt;hasAttribute(&#039;href&#039;) &amp;&amp; $link-&gt;hasAttribute(&#039;rel&#039;))
			{
				$rel = array_unique($this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;space_separated_tokens&#039;, array(strtolower($link-&gt;getAttribute(&#039;rel&#039;)))));
				$line = method_exists($link, &#039;getLineNo&#039;) ? $link-&gt;getLineNo() : 1;

				if ($this-&gt;base_location &lt; $line)
				{
					$href = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;absolutize_url&#039;, array(trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;base));
				}
				else
				{
					$href = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;absolutize_url&#039;, array(trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;http_base));
				}
				if ($href === false)
				{
					continue;
				}

				if (!in_array($href, $done) &amp;&amp; in_array(&#039;feed&#039;, $rel) || (in_array(&#039;alternate&#039;, $rel) &amp;&amp; !in_array(&#039;stylesheet&#039;, $rel) &amp;&amp; $link-&gt;hasAttribute(&#039;type&#039;) &amp;&amp; in_array(strtolower($this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;parse_mime&#039;, array($link-&gt;getAttribute(&#039;type&#039;)))), array(&#039;text/html&#039;, &#039;application/rss+xml&#039;, &#039;application/atom+xml&#039;))) &amp;&amp; !isset($feeds[$href]))
				{
					$this-&gt;checked_feeds++;
					$headers = array(
						&#039;Accept&#039; =&gt; &#039;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&#039;,
					);
					$feed = $this-&gt;registry-&gt;create(&#039;File&#039;, array($href, $this-&gt;timeout, 5, $headers, $this-&gt;useragent, $this-&gt;force_fsockopen, $this-&gt;curl_options));
					if ($feed-&gt;success &amp;&amp; ($feed-&gt;method &amp; SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed-&gt;status_code === 200 || $feed-&gt;status_code &gt; 206 &amp;&amp; $feed-&gt;status_code &lt; 300)) &amp;&amp; $this-&gt;is_feed($feed, true))
					{
						$feeds[$href] = $feed;
					}
				}
				$done[] = $href;
			}
		}

		return $feeds;
	}

	public function get_links()
	{
		if ($this-&gt;dom === null)
		{
			throw new SimplePie_Exception(&#039;DOMDocument not found, unable to use locator&#039;);
		}

		$links = $this-&gt;dom-&gt;getElementsByTagName(&#039;a&#039;);
		foreach ($links as $link)
		{
			if ($link-&gt;hasAttribute(&#039;href&#039;))
			{
				$href = trim($link-&gt;getAttribute(&#039;href&#039;));
				$parsed = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;parse_url&#039;, array($href));
				if ($parsed[&#039;scheme&#039;] === &#039;&#039; || preg_match(&#039;/^(https?|feed)?$/i&#039;, $parsed[&#039;scheme&#039;]))
				{
					if (method_exists($link, &#039;getLineNo&#039;) &amp;&amp; $this-&gt;base_location &lt; $link-&gt;getLineNo())
					{
						$href = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;absolutize_url&#039;, array(trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;base));
					}
					else
					{
						$href = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;absolutize_url&#039;, array(trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;http_base));
					}
					if ($href === false)
					{
						continue;
					}

					$current = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;parse_url&#039;, array($this-&gt;file-&gt;url));

					if ($parsed[&#039;authority&#039;] === &#039;&#039; || $parsed[&#039;authority&#039;] === $current[&#039;authority&#039;])
					{
						$this-&gt;local[] = $href;
					}
					else
					{
						$this-&gt;elsewhere[] = $href;
					}
				}
			}
		}
		$this-&gt;local = array_unique($this-&gt;local);
		$this-&gt;elsewhere = array_unique($this-&gt;elsewhere);
		if (!empty($this-&gt;local) || !empty($this-&gt;elsewhere))
		{
			return true;
		}
		return null;
	}

	public function get_rel_link($rel)
	{
		if ($this-&gt;dom === null)
		{
			throw new SimplePie_Exception(&#039;DOMDocument not found, unable to use &#039;.
			                              &#039;locator&#039;);
		}
		if (!class_exists(&#039;DOMXpath&#039;))
		{
			throw new SimplePie_Exception(&#039;DOMXpath not found, unable to use &#039;.
			                              &#039;get_rel_link&#039;);
		}

		$xpath = new DOMXpath($this-&gt;dom);
		$query = &#039;//a[@rel and @href] | //link[@rel and @href]&#039;;
		foreach ($xpath-&gt;query($query) as $link)
		{
			$href = trim($link-&gt;getAttribute(&#039;href&#039;));
			$parsed = $this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;parse_url&#039;, array($href));
			if ($parsed[&#039;scheme&#039;] === &#039;&#039; ||
			    preg_match(&#039;/^https?$/i&#039;, $parsed[&#039;scheme&#039;]))
			{
				if (method_exists($link, &#039;getLineNo&#039;) &amp;&amp;
				    $this-&gt;base_location &lt; $link-&gt;getLineNo())
				{
					$href =
						$this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;absolutize_url&#039;,
						                      array(trim($link-&gt;getAttribute(&#039;href&#039;)),
						                            $this-&gt;base));
				}
				else
				{
					$href =
						$this-&gt;registry-&gt;call(&#039;Misc&#039;, &#039;absolutize_url&#039;,
						                      array(trim($link-&gt;getAttribute(&#039;href&#039;)),
						                            $this-&gt;http_base));
				}
				if ($href === false)
				{
					return null;
				}
				$rel_values = explode(&#039; &#039;, strtolower($link-&gt;getAttribute(&#039;rel&#039;)));
				if (in_array($rel, $rel_values))
				{
					return $href;
				}
			}
		}
		return null;
	}

	public function extension(&amp;$array)
	{
		foreach ($array as $key =&gt; $value)
		{
			if ($this-&gt;checked_feeds === $this-&gt;max_checked_feeds)
			{
				break;
			}
			if (in_array(strtolower(strrchr($value, &#039;.&#039;)), array(&#039;.rss&#039;, &#039;.rdf&#039;, &#039;.atom&#039;, &#039;.xml&#039;)))
			{
				$this-&gt;checked_feeds++;

				$headers = array(
					&#039;Accept&#039; =&gt; &#039;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&#039;,
				);
				$feed = $this-&gt;registry-&gt;create(&#039;File&#039;, array($value, $this-&gt;timeout, 5, $headers, $this-&gt;useragent, $this-&gt;force_fsockopen, $this-&gt;curl_options));
				if ($feed-&gt;success &amp;&amp; ($feed-&gt;method &amp; SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed-&gt;status_code === 200 || $feed-&gt;status_code &gt; 206 &amp;&amp; $feed-&gt;status_code &lt; 300)) &amp;&amp; $this-&gt;is_feed($feed))
				{
					return array($feed);
				}
				else
				{
					unset($array[$key]);
				}
			}
		}
		return null;
	}

	public function body(&amp;$array)
	{
		foreach ($array as $key =&gt; $value)
		{
			if ($this-&gt;checked_feeds === $this-&gt;max_checked_feeds)
			{
				break;
			}
			if (preg_match(&#039;/(feed|rss|rdf|atom|xml)/i&#039;, $value))
			{
				$this-&gt;checked_feeds++;
				$headers = array(
					&#039;Accept&#039; =&gt; &#039;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&#039;,
				);
				$feed = $this-&gt;registry-&gt;create(&#039;File&#039;, array($value, $this-&gt;timeout, 5, null, $this-&gt;useragent, $this-&gt;force_fsockopen, $this-&gt;curl_options));
				if ($feed-&gt;success &amp;&amp; ($feed-&gt;method &amp; SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed-&gt;status_code === 200 || $feed-&gt;status_code &gt; 206 &amp;&amp; $feed-&gt;status_code &lt; 300)) &amp;&amp; $this-&gt;is_feed($feed))
				{
					return array($feed);
				}
				else
				{
					unset($array[$key]);
				}
			}
		}
		return null;
	}
}
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