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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;
use SimplePie\XML\Declaration\Parser as DeclarationParser;
/**
* Parses XML into something sane
*
*
* This class can be overloaded with {@see \SimplePie\SimplePie::set_parser_class()}
*
* @package SimplePie
* @subpackage Parsing
*/
class Parser implements RegistryAware
{
public $error_code;
public $error_string;
public $current_line;
public $current_column;
public $current_byte;
public $separator = ' ';
public $namespace = [''];
public $element = [''];
public $xml_base = [''];
public $xml_base_explicit = [false];
public $xml_lang = [''];
public $data = [];
public $datas = [[]];
public $current_xhtml_construct = -1;
public $encoding;
protected $registry;
public function set_registry(\SimplePie\Registry $registry)/* : void */
{
$this->registry = $registry;
}
public function parse(&$data, $encoding, $url = '')
{
if (class_exists('DOMXpath') && function_exists('Mf2\parse')) {
$doc = new \DOMDocument();
@$doc->loadHTML($data);
$xpath = new \DOMXpath($doc);
// Check for both h-feed and h-entry, as both a feed with no entries
// and a list of entries without an h-feed wrapper are both valid.
$query = '//*[contains(concat(" ", @class, " "), " h-feed ") or '.
'contains(concat(" ", @class, " "), " h-entry ")]';
$result = $xpath->query($query);
if ($result->length !== 0) {
return $this->parse_microformats($data, $url);
}
}
// Use UTF-8 if we get passed US-ASCII, as every US-ASCII character is a UTF-8 character
if (strtoupper($encoding) === 'US-ASCII') {
$this->encoding = 'UTF-8';
} else {
$this->encoding = $encoding;
}
// Strip BOM:
// UTF-32 Big Endian BOM
if (substr($data, 0, 4) === "\x00\x00\xFE\xFF") {
$data = substr($data, 4);
}
// UTF-32 Little Endian BOM
elseif (substr($data, 0, 4) === "\xFF\xFE\x00\x00") {
$data = substr($data, 4);
}
// UTF-16 Big Endian BOM
elseif (substr($data, 0, 2) === "\xFE\xFF") {
$data = substr($data, 2);
}
// UTF-16 Little Endian BOM
elseif (substr($data, 0, 2) === "\xFF\xFE") {
$data = substr($data, 2);
}
// UTF-8 BOM
elseif (substr($data, 0, 3) === "\xEF\xBB\xBF") {
$data = substr($data, 3);
}
if (substr($data, 0, 5) === '<?xml' && strspn(substr($data, 5, 1), "\x09\x0A\x0D\x20") && ($pos = strpos($data, '?>')) !== false) {
$declaration = $this->registry->create(DeclarationParser::class, [substr($data, 5, $pos - 5)]);
if ($declaration->parse()) {
$data = substr($data, $pos + 2);
$data = '<?xml version="' . $declaration->version . '" encoding="' . $encoding . '" standalone="' . (($declaration->standalone) ? 'yes' : 'no') . '"?>' ."\n". $this->declare_html_entities() . $data;
} else {
$this->error_string = 'SimplePie bug! Please report this!';
return false;
}
}
$return = true;
static $xml_is_sane = null;
if ($xml_is_sane === null) {
$parser_check = xml_parser_create();
xml_parse_into_struct($parser_check, '<foo>&</foo>', $values);
xml_parser_free($parser_check);
$xml_is_sane = isset($values[0]['value']);
}
// Create the parser
if ($xml_is_sane) {
$xml = xml_parser_create_ns($this->encoding, $this->separator);
xml_parser_set_option($xml, XML_OPTION_SKIP_WHITE, 1);
xml_parser_set_option($xml, XML_OPTION_CASE_FOLDING, 0);
xml_set_character_data_handler($xml, [$this, 'cdata']);
xml_set_element_handler($xml, [$this, 'tag_open'], [$this, 'tag_close']);
// Parse!
$wrapper = @is_writable(sys_get_temp_dir()) ? 'php://temp' : 'php://memory';
if (($stream = fopen($wrapper, 'r+')) &&
fwrite($stream, $data) &&
rewind($stream)) {
//Parse by chunks not to use too much memory
do {
$stream_data = fread($stream, 1048576);
if (!xml_parse($xml, $stream_data === false ? '' : $stream_data, feof($stream))) {
$this->error_code = xml_get_error_code($xml);
$this->error_string = xml_error_string($this->error_code);
$return = false;
break;
}
} while (!feof($stream));
fclose($stream);
} else {
$return = false;
}
$this->current_line = xml_get_current_line_number($xml);
$this->current_column = xml_get_current_column_number($xml);
$this->current_byte = xml_get_current_byte_index($xml);
xml_parser_free($xml);
return $return;
}
libxml_clear_errors();
$xml = new \XMLReader();
$xml->xml($data);
while (@$xml->read()) {
switch ($xml->nodeType) {
case constant('XMLReader::END_ELEMENT'):
if ($xml->namespaceURI !== '') {
$tagName = $xml->namespaceURI . $this->separator . $xml->localName;
} else {
$tagName = $xml->localName;
}
$this->tag_close(null, $tagName);
break;
case constant('XMLReader::ELEMENT'):
$empty = $xml->isEmptyElement;
if ($xml->namespaceURI !== '') {
$tagName = $xml->namespaceURI . $this->separator . $xml->localName;
} else {
$tagName = $xml->localName;
}
$attributes = [];
while ($xml->moveToNextAttribute()) {
if ($xml->namespaceURI !== '') {
$attrName = $xml->namespaceURI . $this->separator . $xml->localName;
} else {
$attrName = $xml->localName;
}
$attributes[$attrName] = $xml->value;
}
$this->tag_open(null, $tagName, $attributes);
if ($empty) {
$this->tag_close(null, $tagName);
}
break;
case constant('XMLReader::TEXT'):
case constant('XMLReader::CDATA'):
$this->cdata(null, $xml->value);
break;
}
}
if ($error = libxml_get_last_error()) {
$this->error_code = $error->code;
$this->error_string = $error->message;
$this->current_line = $error->line;
$this->current_column = $error->column;
return false;
}
return true;
}
public function get_error_code()
{
return $this->error_code;
}
public function get_error_string()
{
return $this->error_string;
}
public function get_current_line()
{
return $this->current_line;
}
public function get_current_column()
{
return $this->current_column;
}
public function get_current_byte()
{
return $this->current_byte;
}
public function get_data()
{
return $this->data;
}
public function tag_open($parser, $tag, $attributes)
{
[$this->namespace[], $this->element[]] = $this->split_ns($tag);
$attribs = [];
foreach ($attributes as $name => $value) {
[$attrib_namespace, $attribute] = $this->split_ns($name);
$attribs[$attrib_namespace][$attribute] = $value;
}
if (isset($attribs[\SimplePie\SimplePie::NAMESPACE_XML]['base'])) {
$base = $this->registry->call(Misc::class, 'absolutize_url', [$attribs[\SimplePie\SimplePie::NAMESPACE_XML]['base'], end($this->xml_base)]);
if ($base !== false) {
$this->xml_base[] = $base;
$this->xml_base_explicit[] = true;
}
} else {
$this->xml_base[] = end($this->xml_base);
$this->xml_base_explicit[] = end($this->xml_base_explicit);
}
if (isset($attribs[\SimplePie\SimplePie::NAMESPACE_XML]['lang'])) {
$this->xml_lang[] = $attribs[\SimplePie\SimplePie::NAMESPACE_XML]['lang'];
} else {
$this->xml_lang[] = end($this->xml_lang);
}
if ($this->current_xhtml_construct >= 0) {
$this->current_xhtml_construct++;
if (end($this->namespace) === \SimplePie\SimplePie::NAMESPACE_XHTML) {
$this->data['data'] .= '<' . end($this->element);
if (isset($attribs[''])) {
foreach ($attribs[''] as $name => $value) {
$this->data['data'] .= ' ' . $name . '="' . htmlspecialchars($value, ENT_COMPAT, $this->encoding) . '"';
}
}
$this->data['data'] .= '>';
}
} else {
$this->datas[] = &$this->data;
$this->data = &$this->data['child'][end($this->namespace)][end($this->element)][];
$this->data = ['data' => '', 'attribs' => $attribs, 'xml_base' => end($this->xml_base), 'xml_base_explicit' => end($this->xml_base_explicit), 'xml_lang' => end($this->xml_lang)];
if ((end($this->namespace) === \SimplePie\SimplePie::NAMESPACE_ATOM_03 && in_array(end($this->element), ['title', 'tagline', 'copyright', 'info', 'summary', 'content']) && isset($attribs['']['mode']) && $attribs['']['mode'] === 'xml')
|| (end($this->namespace) === \SimplePie\SimplePie::NAMESPACE_ATOM_10 && in_array(end($this->element), ['rights', 'subtitle', 'summary', 'info', 'title', 'content']) && isset($attribs['']['type']) && $attribs['']['type'] === 'xhtml')
|| (end($this->namespace) === \SimplePie\SimplePie::NAMESPACE_RSS_20 && in_array(end($this->element), ['title']))
|| (end($this->namespace) === \SimplePie\SimplePie::NAMESPACE_RSS_090 && in_array(end($this->element), ['title']))
|| (end($this->namespace) === \SimplePie\SimplePie::NAMESPACE_RSS_10 && in_array(end($this->element), ['title']))) {
$this->current_xhtml_construct = 0;
}
}
}
public function cdata($parser, $cdata)
{
if ($this->current_xhtml_construct >= 0) {
$this->data['data'] .= htmlspecialchars($cdata, ENT_QUOTES, $this->encoding);
} else {
$this->data['data'] .= $cdata;
}
}
public function tag_close($parser, $tag)
{
if ($this->current_xhtml_construct >= 0) {
$this->current_xhtml_construct--;
if (end($this->namespace) === \SimplePie\SimplePie::NAMESPACE_XHTML && !in_array(end($this->element), ['area', 'base', 'basefont', 'br', 'col', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param'])) {
$this->data['data'] .= '</' . end($this->element) . '>';
}
}
if ($this->current_xhtml_construct === -1) {
$this->data = &$this->datas[count($this->datas) - 1];
array_pop($this->datas);
}
array_pop($this->element);
array_pop($this->namespace);
array_pop($this->xml_base);
array_pop($this->xml_base_explicit);
array_pop($this->xml_lang);
}
public function split_ns($string)
{
static $cache = [];
if (!isset($cache[$string])) {
if ($pos = strpos($string, $this->separator)) {
static $separator_length;
if (!$separator_length) {
$separator_length = strlen($this->separator);
}
$namespace = substr($string, 0, $pos);
$local_name = substr($string, $pos + $separator_length);
if (strtolower($namespace) === \SimplePie\SimplePie::NAMESPACE_ITUNES) {
$namespace = \SimplePie\SimplePie::NAMESPACE_ITUNES;
}
// Normalize the Media RSS namespaces
if ($namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG ||
$namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG2 ||
$namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG3 ||
$namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG4 ||
$namespace === \SimplePie\SimplePie::NAMESPACE_MEDIARSS_WRONG5) {
$namespace = \SimplePie\SimplePie::NAMESPACE_MEDIARSS;
}
$cache[$string] = [$namespace, $local_name];
} else {
$cache[$string] = ['', $string];
}
}
return $cache[$string];
}
private function parse_hcard($data, $category = false)
{
$name = '';
$link = '';
// Check if h-card is set and pass that information on in the link.
if (isset($data['type']) && in_array('h-card', $data['type'])) {
if (isset($data['properties']['name'][0])) {
$name = $data['properties']['name'][0];
}
if (isset($data['properties']['url'][0])) {
$link = $data['properties']['url'][0];
if ($name === '') {
$name = $link;
} else {
// can't have commas in categories.
$name = str_replace(',', '', $name);
}
$person_tag = $category ? '<span class="person-tag"></span>' : '';
return '<a class="h-card" href="'.$link.'">'.$person_tag.$name.'</a>';
}
}
return $data['value'] ?? '';
}
private function parse_microformats(&$data, $url)
{
$feed_title = '';
$feed_author = null;
$author_cache = [];
$items = [];
$entries = [];
$mf = \Mf2\parse($data, $url);
// First look for an h-feed.
$h_feed = [];
foreach ($mf['items'] as $mf_item) {
if (in_array('h-feed', $mf_item['type'])) {
$h_feed = $mf_item;
break;
}
// Also look for h-feed or h-entry in the children of each top level item.
if (!isset($mf_item['children'][0]['type'])) {
continue;
}
if (in_array('h-feed', $mf_item['children'][0]['type'])) {
$h_feed = $mf_item['children'][0];
// In this case the parent of the h-feed may be an h-card, so use it as
// the feed_author.
if (in_array('h-card', $mf_item['type'])) {
$feed_author = $mf_item;
}
break;
} elseif (in_array('h-entry', $mf_item['children'][0]['type'])) {
$entries = $mf_item['children'];
// In this case the parent of the h-entry list may be an h-card, so use
// it as the feed_author.
if (in_array('h-card', $mf_item['type'])) {
$feed_author = $mf_item;
}
break;
}
}
if (isset($h_feed['children'])) {
$entries = $h_feed['children'];
// Also set the feed title and store author from the h-feed if available.
if (isset($mf['items'][0]['properties']['name'][0])) {
$feed_title = $mf['items'][0]['properties']['name'][0];
}
if (isset($mf['items'][0]['properties']['author'][0])) {
$feed_author = $mf['items'][0]['properties']['author'][0];
}
} elseif (count($entries) === 0) {
$entries = $mf['items'];
}
for ($i = 0; $i < count($entries); $i++) {
$entry = $entries[$i];
if (in_array('h-entry', $entry['type'])) {
$item = [];
$title = '';
$description = '';
if (isset($entry['properties']['url'][0])) {
$link = $entry['properties']['url'][0];
if (isset($link['value'])) {
$link = $link['value'];
}
$item['link'] = [['data' => $link]];
}
if (isset($entry['properties']['uid'][0])) {
$guid = $entry['properties']['uid'][0];
if (isset($guid['value'])) {
$guid = $guid['value'];
}
$item['guid'] = [['data' => $guid]];
}
if (isset($entry['properties']['name'][0])) {
$title = $entry['properties']['name'][0];
if (isset($title['value'])) {
$title = $title['value'];
}
$item['title'] = [['data' => $title]];
}
if (isset($entry['properties']['author'][0]) || isset($feed_author)) {
// author is a special case, it can be plain text or an h-card array.
// If it's plain text it can also be a url that should be followed to
// get the actual h-card.
$author = $entry['properties']['author'][0] ?? $feed_author;
if (!is_string($author)) {
$author = $this->parse_hcard($author);
} elseif (strpos($author, 'http') === 0) {
if (isset($author_cache[$author])) {
$author = $author_cache[$author];
} else {
$mf = \Mf2\fetch($author);
foreach ($mf['items'] as $hcard) {
// Only interested in an h-card by itself in this case.
if (!in_array('h-card', $hcard['type'])) {
continue;
}
// It must have a url property matching what we fetched.
if (!isset($hcard['properties']['url']) ||
!(in_array($author, $hcard['properties']['url']))) {
continue;
}
// Save parse_hcard the trouble of finding the correct url.
$hcard['properties']['url'][0] = $author;
// Cache this h-card for the next h-entry to check.
$author_cache[$author] = $this->parse_hcard($hcard);
$author = $author_cache[$author];
break;
}
}
}
$item['author'] = [['data' => $author]];
}
if (isset($entry['properties']['photo'][0])) {
// If a photo is also in content, don't need to add it again here.
$content = '';
if (isset($entry['properties']['content'][0]['html'])) {
$content = $entry['properties']['content'][0]['html'];
}
$photo_list = [];
for ($j = 0; $j < count($entry['properties']['photo']); $j++) {
$photo = $entry['properties']['photo'][$j];
if (!empty($photo) && strpos($content, $photo) === false) {
$photo_list[] = $photo;
}
}
// When there's more than one photo show the first and use a lightbox.
// Need a permanent, unique name for the image set, but don't have
// anything unique except for the content itself, so use that.
$count = count($photo_list);
if ($count > 1) {
$image_set_id = preg_replace('/[[:^alnum:]]/', '', $photo_list[0]);
$description = '<p>';
for ($j = 0; $j < $count; $j++) {
$hidden = $j === 0 ? '' : 'class="hidden" ';
$description .= '<a href="'.$photo_list[$j].'" '.$hidden.
'data-lightbox="image-set-'.$image_set_id.'">'.
'<img src="'.$photo_list[$j].'"></a>';
}
$description .= '<br><b>'.$count.' photos</b></p>';
} elseif ($count == 1) {
$description = '<p><img src="'.$photo_list[0].'"></p>';
}
}
if (isset($entry['properties']['content'][0]['html'])) {
// e-content['value'] is the same as p-name when they are on the same
// element. Use this to replace title with a strip_tags version so
// that alt text from images is not included in the title.
if ($entry['properties']['content'][0]['value'] === $title) {
$title = strip_tags($entry['properties']['content'][0]['html']);
$item['title'] = [['data' => $title]];
}
$description .= $entry['properties']['content'][0]['html'];
if (isset($entry['properties']['in-reply-to'][0])) {
$in_reply_to = '';
if (is_string($entry['properties']['in-reply-to'][0])) {
$in_reply_to = $entry['properties']['in-reply-to'][0];
} elseif (isset($entry['properties']['in-reply-to'][0]['value'])) {
$in_reply_to = $entry['properties']['in-reply-to'][0]['value'];
}