<?php

/**

 * SimplePie

 *

 * A PHP-Based RSS and Atom Feed Framework.

 * Takes the hard work out of managing a complete RSS/Atom solution.

 *

 * Copyright (c) 2004-2022, 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 "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

 * @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->file = $file;

        $this->useragent = $useragent;

        $this->timeout = $timeout;

        $this->max_checked_feeds = $max_checked_feeds;

        $this->force_fsockopen = $force_fsockopen;

        $this->curl_options = $curl_options;

        if (class_exists('DOMDocument') && $this->file->body != '') {

            $this->dom = new \DOMDocument();

            set_error_handler(['SimplePie\Misc', 'silence_errors']);

            try {

                $this->dom->loadHTML($this->file->body);

            } catch (\Throwable $ex) {

                $this->dom = null;

            }

            restore_error_handler();

        } else {

            $this->dom = null;

        }

    }

    public function set_registry(\SimplePie\Registry $registry)/* : void */

    {

        $this->registry = $registry;

    }

    public function find($type = \SimplePie\SimplePie::LOCATOR_ALL, &$working = null)

    {

        if ($this->is_feed($this->file)) {

            return $this->file;

        }

        if ($this->file->method & \SimplePie\SimplePie::FILE_SOURCE_REMOTE) {

            $sniffer = $this->registry->create(Content\Type\Sniffer::class, [$this->file]);

            if ($sniffer->get_type() !== 'text/html') {

                return null;

            }

        }

        if ($type & ~\SimplePie\SimplePie::LOCATOR_NONE) {

            $this->get_base();

        }

        if ($type & \SimplePie\SimplePie::LOCATOR_AUTODISCOVERY && $working = $this->autodiscovery()) {

            return $working[0];

        }

        if ($type & (\SimplePie\SimplePie::LOCATOR_LOCAL_EXTENSION | \SimplePie\SimplePie::LOCATOR_LOCAL_BODY | \SimplePie\SimplePie::LOCATOR_REMOTE_EXTENSION | \SimplePie\SimplePie::LOCATOR_REMOTE_BODY) && $this->get_links()) {

            if ($type & \SimplePie\SimplePie::LOCATOR_LOCAL_EXTENSION && $working = $this->extension($this->local)) {

                return $working[0];

            }

            if ($type & \SimplePie\SimplePie::LOCATOR_LOCAL_BODY && $working = $this->body($this->local)) {

                return $working[0];

            }

            if ($type & \SimplePie\SimplePie::LOCATOR_REMOTE_EXTENSION && $working = $this->extension($this->elsewhere)) {

                return $working[0];

            }

            if ($type & \SimplePie\SimplePie::LOCATOR_REMOTE_BODY && $working = $this->body($this->elsewhere)) {

                return $working[0];

            }

        }

        return null;

    }

    public function is_feed($file, $check_html = false)

    {

        if ($file->method & \SimplePie\SimplePie::FILE_SOURCE_REMOTE) {

            $sniffer = $this->registry->create(Content\Type\Sniffer::class, [$file]);

            $sniffed = $sniffer->get_type();

            $mime_types = ['application/rss+xml', 'application/rdf+xml',

                                'text/rdf', 'application/atom+xml', 'text/xml',

                                'application/xml', 'application/x-rss+xml'];

            if ($check_html) {

                $mime_types[] = 'text/html';

            }

            return in_array($sniffed, $mime_types);

        } elseif ($file->method & \SimplePie\SimplePie::FILE_SOURCE_LOCAL) {

            return true;

        } else {

            return false;

        }

    }

    public function get_base()

    {

        if ($this->dom === null) {

            throw new \SimplePie\Exception('DOMDocument not found, unable to use locator');

        }

        $this->http_base = $this->file->url;

        $this->base = $this->http_base;

        $elements = $this->dom->getElementsByTagName('base');

        foreach ($elements as $element) {

            if ($element->hasAttribute('href')) {

                $base = $this->registry->call(Misc::class, 'absolutize_url', [trim($element->getAttribute('href')), $this->http_base]);

                if ($base === false) {

                    continue;

                }

                $this->base = $base;

                $this->base_location = method_exists($element, 'getLineNo') ? $element->getLineNo() : 0;

                break;

            }

        }

    }

    public function autodiscovery()

    {

        $done = [];

        $feeds = [];

        $feeds = array_merge($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);

        }

        return null;

    }

    protected function search_elements_by_tag($name, &$done, $feeds)

    {

        if ($this->dom === null) {

            throw new \SimplePie\Exception('DOMDocument not found, unable to use locator');

        }

        $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::class, 'space_separated_tokens', [strtolower($link->getAttribute('rel'))]));

                $line = method_exists($link, 'getLineNo') ? $link->getLineNo() : 1;

                if ($this->base_location < $line) {

                    $href = $this->registry->call(Misc::class, 'absolutize_url', [trim($link->getAttribute('href')), $this->base]);

                } else {

                    $href = $this->registry->call(Misc::class, 'absolutize_url', [trim($link->getAttribute('href')), $this->http_base]);

                }

                if ($href === false) {

                    continue;

                }

                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::class, 'parse_mime', [$link->getAttribute('type')])), ['text/html', 'application/rss+xml', 'application/atom+xml'])) && !isset($feeds[$href])) {

                    $this->checked_feeds++;

                    $headers = [

                        '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 = $this->registry->create(File::class, [$href, $this->timeout, 5, $headers, $this->useragent, $this->force_fsockopen, $this->curl_options]);

                    if ($feed->success && ($feed->method & \SimplePie\SimplePie::FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed, true)) {

                        $feeds[$href] = $feed;

                    }

                }

                $done[] = $href;

            }

        }

        return $feeds;

    }

    public function get_links()

    {

        if ($this->dom === null) {

            throw new \SimplePie\Exception('DOMDocument not found, unable to use locator');

        }

        $links = $this->dom->getElementsByTagName('a');

        foreach ($links as $link) {

            if ($link->hasAttribute('href')) {

                $href = trim($link->getAttribute('href'));

                $parsed = $this->registry->call(Misc::class, 'parse_url', [$href]);

                if ($parsed['scheme'] === '' || preg_match('/^(https?|feed)?$/i', $parsed['scheme'])) {

                    if (method_exists($link, 'getLineNo') && $this->base_location < $link->getLineNo()) {

                        $href = $this->registry->call(Misc::class, 'absolutize_url', [trim($link->getAttribute('href')), $this->base]);

                    } else {

                        $href = $this->registry->call(Misc::class, 'absolutize_url', [trim($link->getAttribute('href')), $this->http_base]);

                    }

                    if ($href === false) {

                        continue;

                    }

                    $current = $this->registry->call(Misc::class, 'parse_url', [$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 get_rel_link($rel)

    {

        if ($this->dom === null) {

            throw new \SimplePie\Exception('DOMDocument not found, unable to use '.

                                          'locator');

        }

        if (!class_exists('DOMXpath')) {

            throw new \SimplePie\Exception('DOMXpath not found, unable to use '.

                                          'get_rel_link');

        }

        $xpath = new \DOMXpath($this->dom);

        $query = '//a[@rel and @href] | //link[@rel and @href]';

        foreach ($xpath->query($query) as $link) {

            $href = trim($link->getAttribute('href'));

            $parsed = $this->registry->call(Misc::class, 'parse_url', [$href]);

            if ($parsed['scheme'] === '' ||

                preg_match('/^https?$/i', $parsed['scheme'])) {

                if (method_exists($link, 'getLineNo') &&

                    $this->base_location < $link->getLineNo()) {

                    $href = $this->registry->call(

                        Misc::class,

                        'absolutize_url',

                        [trim($link->getAttribute('href')), $this->base]

                    );

                } else {

                    $href = $this->registry->call(

                        Misc::class,

                        'absolutize_url',

                        [trim($link->getAttribute('href')), $this->http_base]

                    );

                }

                if ($href === false) {

                    return null;

                }

                $rel_values = explode(' ', strtolower($link->getAttribute('rel')));

                if (in_array($rel, $rel_values)) {

                    return $href;

                }

            }

        }

        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, '.')), ['.rss', '.rdf', '.atom', '.xml'])) {

                $this->checked_feeds++;

                $headers = [

                    '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 = $this->registry->create(File::class, [$value, $this->timeout, 5, $headers, $this->useragent, $this->force_fsockopen, $this->curl_options]);

                if ($feed->success && ($feed->method & \SimplePie\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('/(feed|rss|rdf|atom|xml)/i', $value)) {

                $this->checked_feeds++;

                $headers = [

                    '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 = $this->registry->create(File::class, [$value, $this->timeout, 5, null, $this->useragent, $this->force_fsockopen, $this->curl_options]);

                if ($feed->success && ($feed->method & \SimplePie\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;

    }

}

class_alias('SimplePie\Locator', 'SimplePie_Locator', false);