<?php

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// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue

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// SPDX-License-Identifier: BSD-3-Clause

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declare(strict_types=1);

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namespace SimplePie;

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use DomDocument;

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use Psr\Http\Client\ClientInterface;

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use Psr\Http\Message\RequestFactoryInterface;

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use Psr\Http\Message\UriFactoryInterface;

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use SimplePie\HTTP\Client;

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use SimplePie\HTTP\ClientException;

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use SimplePie\HTTP\FileClient;

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use SimplePie\HTTP\Psr18Client;

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use SimplePie\HTTP\Response;

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/**

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* Used for feed auto-discovery

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*

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*

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* This class can be overloaded with {@see \SimplePie\SimplePie::set_locator_class()}

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*/

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class Locator implements RegistryAware

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{

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/** @var ?string */

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public $useragent = null;

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/** @var int */

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public $timeout = 10;

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/** @var File */

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public $file;

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/** @var string[] */

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public $local = [];

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/** @var string[] */

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public $elsewhere = [];

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/** @var array<mixed> */

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public $cached_entities = [];

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/** @var string */

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public $http_base;

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/** @var string */

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public $base;

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/** @var int */

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public $base_location = 0;

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/** @var int */

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public $checked_feeds = 0;

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/** @var int */

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public $max_checked_feeds = 10;

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/** @var bool */

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public $force_fsockopen = false;

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/** @var array<int, mixed> */

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public $curl_options = [];

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/** @var ?\DomDocument */

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public $dom;

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/** @var ?Registry */

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protected $registry;

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/**

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* @var Client|null

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*/

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private $http_client = null;

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/**

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* @param array<int, mixed> $curl_options

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*/

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public function __construct(File $file, int $timeout = 10, ?string $useragent = null, int $max_checked_feeds = 10, bool $force_fsockopen = false, array $curl_options = [])

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{

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$this->file = $file;

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$this->useragent = $useragent;

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$this->timeout = $timeout;

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$this->max_checked_feeds = $max_checked_feeds;

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$this->force_fsockopen = $force_fsockopen;

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$this->curl_options = $curl_options;

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$body = $this->file->get_body_content();

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if (class_exists('DOMDocument') && $body != '') {

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

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set_error_handler([Misc::class, 'silence_errors']);

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try {

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

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} catch (\Throwable $ex) {

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$this->dom = null;

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}

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restore_error_handler();

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} else {

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$this->dom = null;

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}

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}

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/**

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* Set a PSR-18 client and PSR-17 factories

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*

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* Allows you to use your own HTTP client implementations.

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*/

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final public function set_http_client(

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ClientInterface $http_client,

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RequestFactoryInterface $request_factory,

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UriFactoryInterface $uri_factory

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): void {

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$this->http_client = new Psr18Client($http_client, $request_factory, $uri_factory);

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}

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/**

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* @return void

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*/

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public function set_registry(\SimplePie\Registry $registry)

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{

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$this->registry = $registry;

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}

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/**

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* @param SimplePie::LOCATOR_* $type

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* @param array<Response>|null $working

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* @return Response|null

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*/

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

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{

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assert($this->registry !== null);

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

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return $this->file;

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}

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if (Misc::is_remote_uri($this->file->get_final_requested_uri())) {

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

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

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return null;

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}

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}

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

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$this->get_base();

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}

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

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return $working[0];

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}

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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()) {

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

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return $working[0];

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}

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

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return $working[0];

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}

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

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return $working[0];

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}

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

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return $working[0];

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}

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}

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return null;

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}

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/**

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* @return bool

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*/

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

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{

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assert($this->registry !== null);

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if (Misc::is_remote_uri($file->get_final_requested_uri())) {

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

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$sniffed = $sniffer->get_type();

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

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

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

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if ($check_html) {

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$mime_types[] = 'text/html';

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}

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return in_array($sniffed, $mime_types);

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} elseif (is_file($file->get_final_requested_uri())) {

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return true;

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} else {

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return false;

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}

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}

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/**

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* @return void

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*/

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public function get_base()

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{

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assert($this->registry !== null);

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

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

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}

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$this->http_base = $this->file->get_final_requested_uri();

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

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

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foreach ($elements as $element) {

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

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

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if ($base === false) {

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continue;

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}

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$this->base = $base;

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

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break;

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}

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}

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}

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/**

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* @return array<Response>|null

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*/

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public function autodiscovery()

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{

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$done = [];

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$feeds = [];

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$feeds = array_merge($feeds, $this->search_elements_by_tag('link', $done, $feeds));

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$feeds = array_merge($feeds, $this->search_elements_by_tag('a', $done, $feeds));

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$feeds = array_merge($feeds, $this->search_elements_by_tag('area', $done, $feeds));

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if (!empty($feeds)) {

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return array_values($feeds);

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}

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return null;

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}

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/**

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* @param string[] $done

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* @param array<string, Response> $feeds

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* @return array<string, Response>

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*/

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

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{

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assert($this->registry !== null);

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

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

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}

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$links = $this->dom->getElementsByTagName($name);

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foreach ($links as $link) {

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if ($this->checked_feeds === $this->max_checked_feeds) {

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break;

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}

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

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$rel = array_unique($this->registry->call(Misc::class, 'space_separated_tokens', [strtolower($link->getAttribute('rel'))]));

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

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

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

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} else {

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

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}

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if ($href === false) {

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continue;

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}

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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])) {

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$this->checked_feeds++;

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$headers = [

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'Accept' => SimplePie::DEFAULT_HTTP_ACCEPT_HEADER,

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];

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try {

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$feed = $this->get_http_client()->request(Client::METHOD_GET, $href, $headers);

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if ((!Misc::is_remote_uri($feed->get_final_requested_uri()) || ($feed->get_status_code() === 200 || $feed->get_status_code() > 206 && $feed->get_status_code() < 300)) && $this->is_feed($feed, true)) {

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$feeds[$href] = $feed;

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}

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} catch (ClientException $th) {

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// Just mark it as done and continue.

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}

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}

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$done[] = $href;

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}

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}

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return $feeds;

[281] Fix | Delete

}

[282] Fix | Delete

[283] Fix | Delete

/**

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* @return true|null

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*/

[286] Fix | Delete

public function get_links()

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{

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assert($this->registry !== null);

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

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

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}

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

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foreach ($links as $link) {

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

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

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

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

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

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

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} else {

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

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}

[305] Fix | Delete

if ($href === false) {

[306] Fix | Delete

continue;

[307] Fix | Delete

}

[308] Fix | Delete

[309] Fix | Delete

$current = $this->registry->call(Misc::class, 'parse_url', [$this->file->get_final_requested_uri()]);

[310] Fix | Delete

[311] Fix | Delete

if ($parsed['authority'] === '' || $parsed['authority'] === $current['authority']) {

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$this->local[] = $href;

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} else {

[314] Fix | Delete

$this->elsewhere[] = $href;

[315] Fix | Delete

}

[316] Fix | Delete

}

[317] Fix | Delete

}

[318] Fix | Delete

}

[319] Fix | Delete

$this->local = array_unique($this->local);

[320] Fix | Delete

$this->elsewhere = array_unique($this->elsewhere);

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if (!empty($this->local) || !empty($this->elsewhere)) {

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return true;

[323] Fix | Delete

}

[324] Fix | Delete

return null;

[325] Fix | Delete

}

[326] Fix | Delete

[327] Fix | Delete

/**

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* Extracts first `link` element with given `rel` attribute inside the `head` element.

[329] Fix | Delete

*

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* @return string|null

[331] Fix | Delete

*/

[332] Fix | Delete

public function get_rel_link(string $rel)

[333] Fix | Delete

{

[334] Fix | Delete

assert($this->registry !== null);

[335] Fix | Delete

[336] Fix | Delete

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

[337] Fix | Delete

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

[338] Fix | Delete

'locator');

[339] Fix | Delete

}

[340] Fix | Delete

if (!class_exists('DOMXpath')) {

[341] Fix | Delete

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

[342] Fix | Delete

'get_rel_link');

[343] Fix | Delete

}

[344] Fix | Delete

[345] Fix | Delete

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

[346] Fix | Delete

$query = '(//head)[1]/link[@rel and @href]';

[347] Fix | Delete

/** @var \DOMNodeList<\DOMElement> */

[348] Fix | Delete

$queryResult = $xpath->query($query);

[349] Fix | Delete

foreach ($queryResult as $link) {

[350] Fix | Delete

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

[351] Fix | Delete

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

[352] Fix | Delete

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

[353] Fix | Delete

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

[354] Fix | Delete

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

[355] Fix | Delete

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

[356] Fix | Delete

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

[357] Fix | Delete

Misc::class,

[358] Fix | Delete

'absolutize_url',

[359] Fix | Delete

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

[360] Fix | Delete

);

[361] Fix | Delete

} else {

[362] Fix | Delete

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

[363] Fix | Delete

Misc::class,

[364] Fix | Delete

'absolutize_url',

[365] Fix | Delete

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

[366] Fix | Delete

);

[367] Fix | Delete

}

[368] Fix | Delete

if ($href === false) {

[369] Fix | Delete

return null;

[370] Fix | Delete

}

[371] Fix | Delete

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

[372] Fix | Delete

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

[373] Fix | Delete

return $href;

[374] Fix | Delete

}

[375] Fix | Delete

}

[376] Fix | Delete

}

[377] Fix | Delete

[378] Fix | Delete

return null;

[379] Fix | Delete

}

[380] Fix | Delete

[381] Fix | Delete

/**

[382] Fix | Delete

* @param string[] $array

[383] Fix | Delete

* @return array<Response>|null

[384] Fix | Delete

*/

[385] Fix | Delete

public function extension(array &$array)

[386] Fix | Delete

{

[387] Fix | Delete

foreach ($array as $key => $value) {

[388] Fix | Delete

if ($this->checked_feeds === $this->max_checked_feeds) {

[389] Fix | Delete

break;

[390] Fix | Delete

}

[391] Fix | Delete

$extension = strrchr($value, '.');

[392] Fix | Delete

if ($extension !== false && in_array(strtolower($extension), ['.rss', '.rdf', '.atom', '.xml'])) {

[393] Fix | Delete

$this->checked_feeds++;

[394] Fix | Delete

[395] Fix | Delete

$headers = [

[396] Fix | Delete

'Accept' => SimplePie::DEFAULT_HTTP_ACCEPT_HEADER,

[397] Fix | Delete

];

[398] Fix | Delete

[399] Fix | Delete

try {

[400] Fix | Delete

$feed = $this->get_http_client()->request(Client::METHOD_GET, $value, $headers);

[401] Fix | Delete

[402] Fix | Delete

if ((!Misc::is_remote_uri($feed->get_final_requested_uri()) || ($feed->get_status_code() === 200 || $feed->get_status_code() > 206 && $feed->get_status_code() < 300)) && $this->is_feed($feed)) {

[403] Fix | Delete

return [$feed];

[404] Fix | Delete

}

[405] Fix | Delete

} catch (ClientException $th) {

[406] Fix | Delete

// Just unset and continue.

[407] Fix | Delete

}

[408] Fix | Delete

[409] Fix | Delete

unset($array[$key]);

[410] Fix | Delete

}

[411] Fix | Delete

}

[412] Fix | Delete

return null;

[413] Fix | Delete

}

[414] Fix | Delete

[415] Fix | Delete

/**

[416] Fix | Delete

* @param string[] $array

[417] Fix | Delete

* @return array<Response>|null

[418] Fix | Delete

*/

[419] Fix | Delete

public function body(array &$array)

[420] Fix | Delete

{

[421] Fix | Delete

foreach ($array as $key => $value) {

[422] Fix | Delete

if ($this->checked_feeds === $this->max_checked_feeds) {

[423] Fix | Delete

break;

[424] Fix | Delete

}

[425] Fix | Delete

if (preg_match('/(feed|rss|rdf|atom|xml)/i', $value)) {

[426] Fix | Delete

$this->checked_feeds++;

[427] Fix | Delete

$headers = [

[428] Fix | Delete

'Accept' => SimplePie::DEFAULT_HTTP_ACCEPT_HEADER,

[429] Fix | Delete

];

[430] Fix | Delete

[431] Fix | Delete

try {

[432] Fix | Delete

$feed = $this->get_http_client()->request(Client::METHOD_GET, $value, $headers);

[433] Fix | Delete

[434] Fix | Delete

if ((!Misc::is_remote_uri($feed->get_final_requested_uri()) || ($feed->get_status_code() === 200 || $feed->get_status_code() > 206 && $feed->get_status_code() < 300)) && $this->is_feed($feed)) {

[435] Fix | Delete

return [$feed];

[436] Fix | Delete

}

[437] Fix | Delete

} catch (ClientException $th) {

[438] Fix | Delete

// Just unset and continue.

[439] Fix | Delete

}

[440] Fix | Delete

[441] Fix | Delete

unset($array[$key]);

[442] Fix | Delete

}

[443] Fix | Delete

}

[444] Fix | Delete

return null;

[445] Fix | Delete

}

[446] Fix | Delete

[447] Fix | Delete

/**

[448] Fix | Delete

* Get a HTTP client

[449] Fix | Delete

*/

[450] Fix | Delete

private function get_http_client(): Client

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{

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assert($this->registry !== null);

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

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$options = [

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'timeout' => $this->timeout,

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'redirects' => 5,

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'force_fsockopen' => $this->force_fsockopen,

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'curl_options' => $this->curl_options,

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];

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if ($this->useragent !== null) {

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$options['useragent'] = $this->useragent;

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}

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return new FileClient(

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$this->registry,

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$options

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);

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}

[471] Fix | Delete

[472] Fix | Delete

return $this->http_client;

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}

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}

[475] Fix | Delete

[476] Fix | Delete

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

[477] Fix | Delete

[478] Fix | Delete