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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) 2004-2022, 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
 */

namespace SimplePie;

/**
 * Used for feed auto-discovery
 *
 *
 * This class can be overloaded with {@see \SimplePie\SimplePie::set_locator_class()}
 *
 * @package SimplePie
 */
class Locator implements RegistryAware
{
    public $useragent;
    public $timeout;
    public $file;
    public $local = [];
    public $elsewhere = [];
    public $cached_entities = [];
    public $http_base;
    public $base;
    public $base_location = 0;
    public $checked_feeds = 0;
    public $max_checked_feeds = 10;
    public $force_fsockopen = false;
    public $curl_options = [];
    public $dom;
    protected $registry;

    public function __construct(\SimplePie\File $file, $timeout = 10, $useragent = null, $max_checked_feeds = 10, $force_fsockopen = false, $curl_options = [])
    {
        $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([&#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)/* : void */
    {
        $this-&gt;registry = $registry;
    }

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

        if ($this-&gt;file-&gt;method &amp; \SimplePie\SimplePie::FILE_SOURCE_REMOTE) {
            $sniffer = $this-&gt;registry-&gt;create(Content\Type\Sniffer::class, [$this-&gt;file]);
            if ($sniffer-&gt;get_type() !== &#039;text/html&#039;) {
                return null;
            }
        }

        if ($type &amp; ~\SimplePie\SimplePie::LOCATOR_NONE) {
            $this-&gt;get_base();
        }

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

        if ($type &amp; (\SimplePie\SimplePie::LOCATOR_LOCAL_EXTENSION | \SimplePie\SimplePie::LOCATOR_LOCAL_BODY | \SimplePie\SimplePie::LOCATOR_REMOTE_EXTENSION | \SimplePie\SimplePie::LOCATOR_REMOTE_BODY) &amp;&amp; $this-&gt;get_links()) {
            if ($type &amp; \SimplePie\SimplePie::LOCATOR_LOCAL_EXTENSION &amp;&amp; $working = $this-&gt;extension($this-&gt;local)) {
                return $working[0];
            }

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

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

            if ($type &amp; \SimplePie\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\SimplePie::FILE_SOURCE_REMOTE) {
            $sniffer = $this-&gt;registry-&gt;create(Content\Type\Sniffer::class, [$file]);
            $sniffed = $sniffer-&gt;get_type();
            $mime_types = [&#039;application/rss+xml&#039;, &#039;application/rdf+xml&#039;,
                                &#039;text/rdf&#039;, &#039;application/atom+xml&#039;, &#039;text/xml&#039;,
                                &#039;application/xml&#039;, &#039;application/x-rss+xml&#039;];
            if ($check_html) {
                $mime_types[] = &#039;text/html&#039;;
            }

            return in_array($sniffed, $mime_types);
        } elseif ($file-&gt;method &amp; \SimplePie\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 = $this-&gt;registry-&gt;call(Misc::class, &#039;absolutize_url&#039;, [trim($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 = [];
        $feeds = [];
        $feeds = array_merge($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(Misc::class, &#039;space_separated_tokens&#039;, [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 = $this-&gt;registry-&gt;call(Misc::class, &#039;absolutize_url&#039;, [trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;base]);
                } else {
                    $href = $this-&gt;registry-&gt;call(Misc::class, &#039;absolutize_url&#039;, [trim($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(Misc::class, &#039;parse_mime&#039;, [$link-&gt;getAttribute(&#039;type&#039;)])), [&#039;text/html&#039;, &#039;application/rss+xml&#039;, &#039;application/atom+xml&#039;])) &amp;&amp; !isset($feeds[$href])) {
                    $this-&gt;checked_feeds++;
                    $headers = [
                        &#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 = $this-&gt;registry-&gt;create(File::class, [$href, $this-&gt;timeout, 5, $headers, $this-&gt;useragent, $this-&gt;force_fsockopen, $this-&gt;curl_options]);
                    if ($feed-&gt;success &amp;&amp; ($feed-&gt;method &amp; \SimplePie\SimplePie::FILE_SOURCE_REMOTE === 0 || ($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 = $this-&gt;registry-&gt;call(Misc::class, &#039;parse_url&#039;, [$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 = $this-&gt;registry-&gt;call(Misc::class, &#039;absolutize_url&#039;, [trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;base]);
                    } else {
                        $href = $this-&gt;registry-&gt;call(Misc::class, &#039;absolutize_url&#039;, [trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;http_base]);
                    }
                    if ($href === false) {
                        continue;
                    }

                    $current = $this-&gt;registry-&gt;call(Misc::class, &#039;parse_url&#039;, [$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 = $this-&gt;registry-&gt;call(Misc::class, &#039;parse_url&#039;, [$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 = $this-&gt;registry-&gt;call(
                        Misc::class,
                        &#039;absolutize_url&#039;,
                        [trim($link-&gt;getAttribute(&#039;href&#039;)), $this-&gt;base]
                    );
                } else {
                    $href = $this-&gt;registry-&gt;call(
                        Misc::class,
                        &#039;absolutize_url&#039;,
                        [trim($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;)), [&#039;.rss&#039;, &#039;.rdf&#039;, &#039;.atom&#039;, &#039;.xml&#039;])) {
                $this-&gt;checked_feeds++;

                $headers = [
                    &#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 = $this-&gt;registry-&gt;create(File::class, [$value, $this-&gt;timeout, 5, $headers, $this-&gt;useragent, $this-&gt;force_fsockopen, $this-&gt;curl_options]);
                if ($feed-&gt;success &amp;&amp; ($feed-&gt;method &amp; \SimplePie\SimplePie::FILE_SOURCE_REMOTE === 0 || ($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 [$feed];
                } else {
                    unset($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 = [
                    &#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 = $this-&gt;registry-&gt;create(File::class, [$value, $this-&gt;timeout, 5, null, $this-&gt;useragent, $this-&gt;force_fsockopen, $this-&gt;curl_options]);
                if ($feed-&gt;success &amp;&amp; ($feed-&gt;method &amp; \SimplePie\SimplePie::FILE_SOURCE_REMOTE === 0 || ($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 [$feed];
                } else {
                    unset($array[$key]);
                }
            }
        }
        return null;
    }
}

class_alias(&#039;SimplePie\Locator&#039;, &#039;SimplePie_Locator&#039;, false);
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