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<?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);
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