933 lines
34 KiB
PHP
933 lines
34 KiB
PHP
<?php
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/**
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* Project: MagpieRSS: a simple RSS integration tool
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* File: rss_parse.inc - parse an RSS or Atom feed
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* return as a simple object.
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*
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* Handles RSS 0.9x, RSS 2.0, RSS 1.0, Atom 0.3, and Atom 1.0
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*
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* The lastest version of MagpieRSS can be obtained from:
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* http://magpierss.sourceforge.net
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*
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* For questions, help, comments, discussion, etc., please join the
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* Magpie mailing list:
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* magpierss-general@lists.sourceforge.net
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*
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* @author Kellan Elliott-McCrea <kellan@protest.net>
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* @version 0.8
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* @license GPL
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*
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*/
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define('RSS', 'RSS');
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define('ATOM', 'Atom');
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require_once (MAGPIE_DIR . 'rss_utils.inc');
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/**
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* Hybrid parser, and object, takes RSS as a string and returns a simple object.
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*
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* see: rss_fetch.inc for a simpler interface with integrated caching support
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*
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*/
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class MagpieRSS {
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var $parser;
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var $current_item = array(); // item currently being parsed
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var $items = array(); // collection of parsed items
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var $channel = array(); // hash of channel fields
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var $textinput = array();
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var $image = array();
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var $feed_type;
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var $feed_version;
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var $encoding = ''; // output encoding of parsed rss
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var $_source_encoding = ''; // only set if we have to parse xml prolog
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var $ERROR = "";
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var $WARNING = "";
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// define some constants
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var $_ATOM_CONTENT_CONSTRUCTS = array(
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'content', 'summary', 'title', /* common */
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'info', 'tagline', 'copyright', /* Atom 0.3 */
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'rights', 'subtitle', /* Atom 1.0 */
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);
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var $_XHTML_CONTENT_CONSTRUCTS = array('body', 'div');
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var $_KNOWN_ENCODINGS = array('UTF-8', 'US-ASCII', 'ISO-8859-1');
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// parser variables, useless if you're not a parser, treat as private
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var $stack = array(); // parser stack
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var $inchannel = false;
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var $initem = false;
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var $incontent = array(); // non-empty if in namespaced XML content field
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var $exclude_top = false; // true when Atom 1.0 type="xhtml"
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var $intextinput = false;
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var $inimage = false;
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var $current_namespace = false;
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/**
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* Set up XML parser, parse source, and return populated RSS object..
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*
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* @param string $source string containing the RSS to be parsed
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*
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* NOTE: Probably a good idea to leave the encoding options alone unless
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* you know what you're doing as PHP's character set support is
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* a little weird.
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*
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* NOTE: A lot of this is unnecessary but harmless with PHP5
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*
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*
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* @param string $output_encoding output the parsed RSS in this character
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* set defaults to ISO-8859-1 as this is PHP's
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* default.
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*
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* NOTE: might be changed to UTF-8 in future
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* versions.
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*
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* @param string $input_encoding the character set of the incoming RSS source.
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* Leave blank and Magpie will try to figure it
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* out.
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*
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*
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* @param bool $detect_encoding if false Magpie won't attempt to detect
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* source encoding. (caveat emptor)
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*
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*/
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function MagpieRSS ($source, $output_encoding='ISO-8859-1',
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$input_encoding=null, $detect_encoding=true)
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{
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# if PHP xml isn't compiled in, die
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#
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if (!function_exists('xml_parser_create')) {
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$this->error( "Failed to load PHP's XML Extension. " .
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"http://www.php.net/manual/en/ref.xml.php",
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E_USER_ERROR );
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}
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list($parser, $source) = $this->create_parser($source,
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$output_encoding, $input_encoding, $detect_encoding);
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if (!is_resource($parser)) {
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$this->error( "Failed to create an instance of PHP's XML parser. " .
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"http://www.php.net/manual/en/ref.xml.php",
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E_USER_ERROR );
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}
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$this->parser = $parser;
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# pass in parser, and a reference to this object
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# setup handlers
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#
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xml_set_object( $this->parser, $this );
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xml_set_element_handler($this->parser,
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'feed_start_element', 'feed_end_element' );
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xml_set_character_data_handler( $this->parser, 'feed_cdata' );
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$status = xml_parse( $this->parser, $source );
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# try to force convert everything to UTF-8 and parse again
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# to salvage at least some data from the feed
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if (! $status) {
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$errorcode = xml_get_error_code( $this->parser );
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if ( $errorcode != XML_ERROR_NONE ) {
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xml_parser_free( $this->parser );
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list($parser, $source) = $this->create_parser($source,
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$output_encoding, $input_encoding, $detect_encoding);
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$source = mb_convert_encoding($source, "UTF-8",
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mb_detect_encoding($source));
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$this->parser = $parser;
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xml_set_object( $this->parser, $this );
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xml_set_element_handler($this->parser,
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'feed_start_element', 'feed_end_element' );
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xml_set_character_data_handler( $this->parser, 'feed_cdata' );
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$status = xml_parse( $this->parser, $source);
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}
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}
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if (! $status ) {
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$errorcode = xml_get_error_code( $this->parser );
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if ( $errorcode != XML_ERROR_NONE ) {
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$xml_error = xml_error_string( $errorcode );
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$error_line = xml_get_current_line_number($this->parser);
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$error_col = xml_get_current_column_number($this->parser);
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$errormsg = "$xml_error at line $error_line, column $error_col";
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$this->error( $errormsg );
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}
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}
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xml_parser_free( $this->parser );
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$this->normalize();
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}
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function feed_start_element($p, $element, &$attrs) {
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$el = $element = strtolower($element);
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$attrs = array_change_key_case($attrs, CASE_LOWER);
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// check for a namespace, and split if found
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// Don't munge content tags
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if ( empty($this->incontent) ) {
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$ns = false;
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if ( strpos( $element, ':' ) ) {
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list($ns, $el) = split( ':', $element, 2);
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}
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if ( $ns and $ns != 'rdf' ) {
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$this->current_namespace = $ns;
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}
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}
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# if feed type isn't set, then this is first element of feed
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# identify feed from root element
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#
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if (!isset($this->feed_type) ) {
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if ( $el == 'rdf' ) {
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$this->feed_type = RSS;
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$this->feed_version = '1.0';
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}
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elseif ( $el == 'rss' ) {
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$this->feed_type = RSS;
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$this->feed_version = $attrs['version'];
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}
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elseif ( $el == 'feed' ) {
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$this->feed_type = ATOM;
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if ($attrs['xmlns'] == 'http://www.w3.org/2005/Atom') { // Atom 1.0
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$this->feed_version = '1.0';
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}
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else { // Atom 0.3, probably.
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$this->feed_version = $attrs['version'];
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}
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$this->inchannel = true;
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}
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return;
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}
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// if we're inside a namespaced content construct, treat tags as text
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if ( !empty($this->incontent) )
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{
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if ((count($this->incontent) > 1) or !$this->exclude_top) {
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// if tags are inlined, then flatten
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$attrs_str = join(' ',
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array_map('map_attrs',
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array_keys($attrs),
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array_values($attrs) )
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);
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if (strlen($attrs_str) > 0) { $attrs_str = ' '.$attrs_str; }
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$this->append_content( "<{$element}{$attrs_str}>" );
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}
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array_push($this->incontent, $el); // stack for parsing content XML
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}
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elseif ( $el == 'channel' ) {
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$this->inchannel = true;
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}
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elseif ($el == 'item' or $el == 'entry' )
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{
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$this->initem = true;
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if ( isset($attrs['rdf:about']) ) {
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$this->current_item['about'] = $attrs['rdf:about'];
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}
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}
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// if we're in the default namespace of an RSS feed,
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// record textinput or image fields
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elseif (
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$this->feed_type == RSS and
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$this->current_namespace == '' and
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$el == 'textinput' )
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{
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$this->intextinput = true;
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}
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elseif (
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$this->feed_type == RSS and
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$this->current_namespace == '' and
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$el == 'image' )
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{
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$this->inimage = true;
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}
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// set stack[0] to current element
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else {
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// Atom support many links per containing element.
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// Magpie treats link elements of type rel='alternate'
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// as being equivalent to RSS's simple link element.
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$atom_link = false;
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if ($this->feed_type == ATOM and $el == 'link') {
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$atom_link = true;
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if (isset($attrs['rel']) and $attrs['rel'] != 'alternate') {
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$el = $el . "_" . $attrs['rel']; // pseudo-element names for Atom link elements
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}
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}
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# handle atom content constructs
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elseif ( $this->feed_type == ATOM and in_array($el, $this->_ATOM_CONTENT_CONSTRUCTS) )
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{
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// avoid clashing w/ RSS mod_content
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if ($el == 'content' ) {
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$el = 'atom_content';
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}
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// assume that everything accepts namespaced XML
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// (that will pass through some non-validating feeds;
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// but so what? this isn't a validating parser)
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$this->incontent = array();
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array_push($this->incontent, $el); // start a stack
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if ( isset($attrs['type']) and trim(strtolower($attrs['type']))=='xhtml') {
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$this->exclude_top = true;
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} else {
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$this->exclude_top = false;
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}
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}
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# Handle inline XHTML body elements --CWJ
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elseif (($this->current_namespace=='xhtml' or
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(isset($attrs['xmlns']) and $attrs['xmlns'] == 'http://www.w3.org/1999/xhtml'))
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and in_array($el, $this->_XHTML_CONTENT_CONSTRUCTS) )
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{
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$this->current_namespace = 'xhtml';
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$this->incontent = array();
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array_push($this->incontent, $el); // start a stack
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$this->exclude_top = false;
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}
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array_unshift($this->stack, $el);
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$elpath = join('_', array_reverse($this->stack));
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$n = $this->element_count($elpath);
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$this->element_count($elpath, $n+1);
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if ($n > 0) {
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array_shift($this->stack);
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array_unshift($this->stack, $el.'#'.($n+1));
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$elpath = join('_', array_reverse($this->stack));
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}
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// this makes the baby Jesus cry, but we can't do it in normalize()
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// because we've made the element name for Atom links unpredictable
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// by tacking on the relation to the end. -CWJ
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if ($atom_link and isset($attrs['href'])) {
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$this->append($elpath, $attrs['href']);
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}
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// add attributes
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if (count($attrs) > 0) {
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$this->append($elpath.'@', join(',', array_keys($attrs)));
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foreach ($attrs as $attr => $value) {
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$this->append($elpath.'@'.$attr, $value);
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}
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}
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}
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}
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function feed_cdata ($p, $text) {
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if ($this->incontent) {
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$this->append_content( $text );
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}
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else {
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$current_el = join('_', array_reverse($this->stack));
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$this->append($current_el, $text);
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}
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}
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function feed_end_element ($p, $el) {
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$el = strtolower($el);
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if ( $this->incontent ) {
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$opener = array_pop($this->incontent);
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// Don't get bamboozled by namespace voodoo
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if (strpos($el, ':')) { list($ns, $closer) = split(':', $el); }
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else { $ns = false; $closer = $el; }
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// Don't get bamboozled by our munging of <atom:content>, either
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if ($this->feed_type == ATOM and $closer == 'content') {
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$closer = 'atom_content';
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}
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// balance tags properly
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// note: i don't think this is actually neccessary
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if ($opener != $closer) {
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array_push($this->incontent, $opener);
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$this->append_content("<$el />");
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} elseif ($this->incontent) { // are we in the content construct still?
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if ((count($this->incontent) > 1) or !$this->exclude_top) {
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$this->append_content("</$el>");
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}
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} else { // shift the opening of the content construct off the normal stack
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array_shift( $this->stack );
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}
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}
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elseif ( $el == 'item' or $el == 'entry' )
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{
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$this->items[] = $this->current_item;
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$this->current_item = array();
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$this->initem = false;
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$this->current_category = 0;
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}
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elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'textinput' )
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{
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$this->intextinput = false;
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}
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elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'image' )
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{
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$this->inimage = false;
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}
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elseif ($el == 'channel' or $el == 'feed' )
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{
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$this->inchannel = false;
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}
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else {
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array_shift( $this->stack );
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}
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if ( !$this->incontent ) { // Don't munge the namespace after finishing with elements in namespaced content constructs -CWJ
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$this->current_namespace = false;
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}
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}
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function concat (&$str1, $str2="") {
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if (!isset($str1) ) {
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$str1="";
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}
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$str1 .= $str2;
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}
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function append_content($text) {
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if ( $this->initem ) {
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if ($this->current_namespace) {
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$this->concat( $this->current_item[$this->current_namespace][ reset($this->incontent) ], $text );
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} else {
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$this->concat( $this->current_item[ reset($this->incontent) ], $text );
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}
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}
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elseif ( $this->inchannel ) {
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if ($this->current_namespace) {
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$this->concat( $this->channel[$this->current_namespace][ reset($this->incontent) ], $text );
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} else {
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$this->concat( $this->channel[ reset($this->incontent) ], $text );
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}
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}
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}
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// smart append - field and namespace aware
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function append($el, $text) {
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if (!$el) {
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return;
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}
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if ( $this->current_namespace )
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{
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if ( $this->initem ) {
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$this->concat(
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$this->current_item[ $this->current_namespace ][ $el ], $text);
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}
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elseif ($this->inchannel) {
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$this->concat(
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$this->channel[ $this->current_namespace][ $el ], $text );
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}
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elseif ($this->intextinput) {
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$this->concat(
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$this->textinput[ $this->current_namespace][ $el ], $text );
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}
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elseif ($this->inimage) {
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$this->concat(
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$this->image[ $this->current_namespace ][ $el ], $text );
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}
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}
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else {
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if ( $this->initem ) {
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$this->concat(
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$this->current_item[ $el ], $text);
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}
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elseif ($this->intextinput) {
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$this->concat(
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$this->textinput[ $el ], $text );
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}
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elseif ($this->inimage) {
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$this->concat(
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$this->image[ $el ], $text );
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}
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elseif ($this->inchannel) {
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$this->concat(
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$this->channel[ $el ], $text );
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}
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}
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}
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// smart count - field and namespace aware
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function element_count ($el, $set = NULL) {
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if (!$el) {
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return;
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}
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if ( $this->current_namespace )
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{
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if ( $this->initem ) {
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if (!is_null($set)) { $this->current_item[ $this->current_namespace ][ $el.'#' ] = $set; }
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$ret = (isset($this->current_item[ $this->current_namespace ][ $el.'#' ]) ?
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$this->current_item[ $this->current_namespace ][ $el.'#' ] : 0);
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}
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elseif ($this->inchannel) {
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if (!is_null($set)) { $this->channel[ $this->current_namespace ][ $el.'#' ] = $set; }
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$ret = (isset($this->channel[ $this->current_namespace][ $el.'#' ]) ?
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$this->channel[ $this->current_namespace][ $el.'#' ] : 0);
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}
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}
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else {
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if ( $this->initem ) {
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if (!is_null($set)) { $this->current_item[ $el.'#' ] = $set; }
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$ret = (isset($this->current_item[ $el.'#' ]) ?
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$this->current_item[ $el.'#' ] : 0);
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}
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elseif ($this->inchannel) {
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if (!is_null($set)) {$this->channel[ $el.'#' ] = $set; }
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$ret = (isset($this->channel[ $el.'#' ]) ?
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$this->channel[ $el.'#' ] : 0);
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}
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}
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return $ret;
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}
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function normalize_enclosure (&$source, $from, &$dest, $to, $i) {
|
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$id_from = $this->element_id($from, $i);
|
|
$id_to = $this->element_id($to, $i);
|
|
if (isset($source["{$id_from}@"])) {
|
|
foreach (explode(',', $source["{$id_from}@"]) as $attr) {
|
|
if ($from=='link_enclosure' and $attr=='href') { // from Atom
|
|
$dest["{$id_to}@url"] = $source["{$id_from}@{$attr}"];
|
|
$dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
|
|
}
|
|
elseif ($from=='enclosure' and $attr=='url') { // from RSS
|
|
$dest["{$id_to}@href"] = $source["{$id_from}@{$attr}"];
|
|
$dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
|
|
}
|
|
else {
|
|
$dest["{$id_to}@{$attr}"] = $source["{$id_from}@{$attr}"];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function normalize_atom_person (&$source, $person, &$dest, $to, $i) {
|
|
$id = $this->element_id($person, $i);
|
|
$id_to = $this->element_id($to, $i);
|
|
|
|
// Atom 0.3 <=> Atom 1.0
|
|
if ($this->feed_version >= 1.0) { $used = 'uri'; $norm = 'url'; }
|
|
else { $used = 'url'; $norm = 'uri'; }
|
|
|
|
if (isset($source["{$id}_{$used}"])) {
|
|
$dest["{$id_to}_{$norm}"] = $source["{$id}_{$used}"];
|
|
}
|
|
|
|
// Atom to RSS 2.0 and Dublin Core
|
|
// RSS 2.0 person strings should be valid e-mail addresses if possible.
|
|
if (isset($source["{$id}_email"])) {
|
|
$rss_author = $source["{$id}_email"];
|
|
}
|
|
if (isset($source["{$id}_name"])) {
|
|
$rss_author = $source["{$id}_name"]
|
|
. (isset($rss_author) ? " <$rss_author>" : '');
|
|
}
|
|
if (isset($rss_author)) {
|
|
$source[$id] = $rss_author; // goes to top-level author or contributor
|
|
$dest[$id_to] = $rss_author; // goes to dc:creator or dc:contributor
|
|
}
|
|
}
|
|
|
|
// Normalize Atom 1.0 and RSS 2.0 categories to Dublin Core...
|
|
function normalize_category (&$source, $from, &$dest, $to, $i) {
|
|
$cat_id = $this->element_id($from, $i);
|
|
$dc_id = $this->element_id($to, $i);
|
|
|
|
// first normalize category elements: Atom 1.0 <=> RSS 2.0
|
|
if ( isset($source["{$cat_id}@term"]) ) { // category identifier
|
|
$source[$cat_id] = $source["{$cat_id}@term"];
|
|
} elseif ( $this->feed_type == RSS ) {
|
|
$source["{$cat_id}@term"] = $source[$cat_id];
|
|
}
|
|
|
|
if ( isset($source["{$cat_id}@scheme"]) ) { // URI to taxonomy
|
|
$source["{$cat_id}@domain"] = $source["{$cat_id}@scheme"];
|
|
} elseif ( isset($source["{$cat_id}@domain"]) ) {
|
|
$source["{$cat_id}@scheme"] = $source["{$cat_id}@domain"];
|
|
}
|
|
|
|
// Now put the identifier into dc:subject
|
|
$dest[$dc_id] = $source[$cat_id];
|
|
}
|
|
|
|
// ... or vice versa
|
|
function normalize_dc_subject (&$source, $from, &$dest, $to, $i) {
|
|
$dc_id = $this->element_id($from, $i);
|
|
$cat_id = $this->element_id($to, $i);
|
|
|
|
$dest[$cat_id] = $source[$dc_id]; // RSS 2.0
|
|
$dest["{$cat_id}@term"] = $source[$dc_id]; // Atom 1.0
|
|
}
|
|
|
|
// simplify the logic for normalize(). Makes sure that count of elements and
|
|
// each of multiple elements is normalized properly. If you need to mess
|
|
// with things like attributes or change formats or the like, pass it a
|
|
// callback to handle each element.
|
|
function normalize_element (&$source, $from, &$dest, $to, $via = NULL) {
|
|
if (isset($source[$from]) or isset($source["{$from}#"])) {
|
|
if (isset($source["{$from}#"])) {
|
|
$n = $source["{$from}#"];
|
|
$dest["{$to}#"] = $source["{$from}#"];
|
|
}
|
|
else { $n = 1; }
|
|
|
|
for ($i = 1; $i <= $n; $i++) {
|
|
if (isset($via)) { // custom callback for ninja attacks
|
|
$this->{$via}($source, $from, $dest, $to, $i);
|
|
}
|
|
else { // just make it the same
|
|
$from_id = $this->element_id($from, $i);
|
|
$to_id = $this->element_id($to, $i);
|
|
$dest[$to_id] = $source[$from_id];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function normalize () {
|
|
// if atom populate rss fields and normalize 0.3 and 1.0 feeds
|
|
if ( $this->is_atom() ) {
|
|
// Atom 1.0 elements <=> Atom 0.3 elements (Thanks, o brilliant wordsmiths of the Atom 1.0 standard!)
|
|
if ($this->feed_version < 1.0) {
|
|
$this->normalize_element($this->channel, 'tagline', $this->channel, 'subtitle');
|
|
$this->normalize_element($this->channel, 'copyright', $this->channel, 'rights');
|
|
$this->normalize_element($this->channel, 'modified', $this->channel, 'updated');
|
|
} else {
|
|
$this->normalize_element($this->channel, 'subtitle', $this->channel, 'tagline');
|
|
$this->normalize_element($this->channel, 'rights', $this->channel, 'copyright');
|
|
$this->normalize_element($this->channel, 'updated', $this->channel, 'modified');
|
|
}
|
|
$this->normalize_element($this->channel, 'author', $this->channel['dc'], 'creator', 'normalize_atom_person');
|
|
$this->normalize_element($this->channel, 'contributor', $this->channel['dc'], 'contributor', 'normalize_atom_person');
|
|
|
|
// Atom elements to RSS elements
|
|
$this->normalize_element($this->channel, 'subtitle', $this->channel, 'description');
|
|
|
|
if ( isset($this->channel['logo']) ) {
|
|
$this->normalize_element($this->channel, 'logo', $this->image, 'url');
|
|
$this->normalize_element($this->channel, 'link', $this->image, 'link');
|
|
$this->normalize_element($this->channel, 'title', $this->image, 'title');
|
|
}
|
|
|
|
for ( $i = 0; $i < count($this->items); $i++) {
|
|
$item = $this->items[$i];
|
|
|
|
// Atom 1.0 elements <=> Atom 0.3 elements
|
|
if ($this->feed_version < 1.0) {
|
|
$this->normalize_element($item, 'modified', $item, 'updated');
|
|
$this->normalize_element($item, 'issued', $item, 'published');
|
|
} else {
|
|
$this->normalize_element($item, 'updated', $item, 'modified');
|
|
$this->normalize_element($item, 'published', $item, 'issued');
|
|
}
|
|
|
|
// "If an atom:entry element does not contain
|
|
// atom:author elements, then the atom:author elements
|
|
// of the contained atom:source element are considered
|
|
// to apply. In an Atom Feed Document, the atom:author
|
|
// elements of the containing atom:feed element are
|
|
// considered to apply to the entry if there are no
|
|
// atom:author elements in the locations described
|
|
// above." <http://atompub.org/2005/08/17/draft-ietf-atompub-format-11.html#rfc.section.4.2.1>
|
|
if (!isset($item["author#"])) {
|
|
if (isset($item["source_author#"])) { // from aggregation source
|
|
$source = $item;
|
|
$author = "source_author";
|
|
} elseif (isset($this->channel["author#"])) { // from containing feed
|
|
$source = $this->channel;
|
|
$author = "author";
|
|
}
|
|
|
|
$item["author#"] = $source["{$author}#"];
|
|
for ($au = 1; $au <= $item["author#"]; $au++) {
|
|
$id_to = $this->element_id('author', $au);
|
|
$id_from = $this->element_id($author, $au);
|
|
|
|
$item[$id_to] = $source[$id_from];
|
|
foreach (array('name', 'email', 'uri', 'url') as $what) {
|
|
if (isset($source["{$id_from}_{$what}"])) {
|
|
$item["{$id_to}_{$what}"] = $source["{$id_from}_{$what}"];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Atom elements to RSS elements
|
|
$this->normalize_element($item, 'author', $item['dc'], 'creator', 'normalize_atom_person');
|
|
$this->normalize_element($item, 'contributor', $item['dc'], 'contributor', 'normalize_atom_person');
|
|
$this->normalize_element($item, 'summary', $item, 'description');
|
|
$this->normalize_element($item, 'atom_content', $item['content'], 'encoded');
|
|
$this->normalize_element($item, 'link_enclosure', $item, 'enclosure', 'normalize_enclosure');
|
|
|
|
// Categories
|
|
if ( isset($item['category#']) ) { // Atom 1.0 categories to dc:subject and RSS 2.0 categories
|
|
$this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
|
|
}
|
|
elseif ( isset($item['dc']['subject#']) ) { // dc:subject to Atom 1.0 and RSS 2.0 categories
|
|
$this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
|
|
}
|
|
|
|
// Normalized item timestamp
|
|
$atom_date = (isset($item['published']) ) ? $item['published'] : $item['updated'];
|
|
if ( $atom_date ) {
|
|
$epoch = @parse_w3cdtf($atom_date);
|
|
if ($epoch and $epoch > 0) {
|
|
$item['date_timestamp'] = $epoch;
|
|
}
|
|
}
|
|
|
|
$this->items[$i] = $item;
|
|
}
|
|
}
|
|
elseif ( $this->is_rss() ) {
|
|
// RSS elements to Atom elements
|
|
$this->normalize_element($this->channel, 'description', $this->channel, 'tagline'); // Atom 0.3
|
|
$this->normalize_element($this->channel, 'description', $this->channel, 'subtitle'); // Atom 1.0 (yay wordsmithing!)
|
|
$this->normalize_element($this->image, 'url', $this->channel, 'logo');
|
|
|
|
for ( $i = 0; $i < count($this->items); $i++) {
|
|
$item = $this->items[$i];
|
|
|
|
// RSS elements to Atom elements
|
|
$this->normalize_element($item, 'description', $item, 'summary');
|
|
$this->normalize_element($item['content'], 'encoded', $item, 'atom_content');
|
|
$this->normalize_element($item, 'enclosure', $item, 'link_enclosure', 'normalize_enclosure');
|
|
|
|
// Categories
|
|
if ( isset($item['category#']) ) { // RSS 2.0 categories to dc:subject and Atom 1.0 categories
|
|
$this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
|
|
}
|
|
elseif ( isset($item['dc']['subject#']) ) { // dc:subject to Atom 1.0 and RSS 2.0 categories
|
|
$this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
|
|
}
|
|
|
|
// Normalized item timestamp
|
|
if ( $this->is_rss() == '1.0' and isset($item['dc']['date']) ) {
|
|
$epoch = @parse_w3cdtf($item['dc']['date']);
|
|
if ($epoch and $epoch > 0) {
|
|
$item['date_timestamp'] = $epoch;
|
|
}
|
|
}
|
|
elseif ( isset($item['pubdate']) ) {
|
|
$epoch = @strtotime($item['pubdate']);
|
|
if ($epoch > 0) {
|
|
$item['date_timestamp'] = $epoch;
|
|
}
|
|
}
|
|
|
|
$this->items[$i] = $item;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
function is_rss () {
|
|
if ( $this->feed_type == RSS ) {
|
|
return $this->feed_version;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
function is_atom() {
|
|
if ( $this->feed_type == ATOM ) {
|
|
return $this->feed_version;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* return XML parser, and possibly re-encoded source
|
|
*
|
|
*/
|
|
function create_parser($source, $out_enc, $in_enc, $detect) {
|
|
if ( substr(phpversion(),0,1) == 5) {
|
|
$parser = $this->php5_create_parser($in_enc, $detect);
|
|
}
|
|
else {
|
|
list($parser, $source) = $this->php4_create_parser($source, $in_enc, $detect);
|
|
}
|
|
if ($out_enc) {
|
|
$this->encoding = $out_enc;
|
|
xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $out_enc);
|
|
}
|
|
|
|
return array($parser, $source);
|
|
}
|
|
|
|
/**
|
|
* Instantiate an XML parser under PHP5
|
|
*
|
|
* PHP5 will do a fine job of detecting input encoding
|
|
* if passed an empty string as the encoding.
|
|
*
|
|
* All hail libxml2!
|
|
*
|
|
*/
|
|
function php5_create_parser($in_enc, $detect) {
|
|
// by default php5 does a fine job of detecting input encodings
|
|
if(!$detect && $in_enc) {
|
|
return xml_parser_create($in_enc);
|
|
}
|
|
else {
|
|
return xml_parser_create('');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Instaniate an XML parser under PHP4
|
|
*
|
|
* Unfortunately PHP4's support for character encodings
|
|
* and especially XML and character encodings sucks. As
|
|
* long as the documents you parse only contain characters
|
|
* from the ISO-8859-1 character set (a superset of ASCII,
|
|
* and a subset of UTF-8) you're fine. However once you
|
|
* step out of that comfy little world things get mad, bad,
|
|
* and dangerous to know.
|
|
*
|
|
* The following code is based on SJM's work with FoF
|
|
* @see http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
|
|
*
|
|
*/
|
|
function php4_create_parser($source, $in_enc, $detect) {
|
|
if ( !$detect ) {
|
|
return array(xml_parser_create($in_enc), $source);
|
|
}
|
|
|
|
if (!$in_enc) {
|
|
if (preg_match('/<?xml.*encoding=[\'"](.*?)[\'"].*?>/m', $source, $m)) {
|
|
$in_enc = strtoupper($m[1]);
|
|
$this->source_encoding = $in_enc;
|
|
}
|
|
else {
|
|
$in_enc = 'UTF-8';
|
|
}
|
|
}
|
|
|
|
if ($this->known_encoding($in_enc)) {
|
|
return array(xml_parser_create($in_enc), $source);
|
|
}
|
|
|
|
// the dectected encoding is not one of the simple encodings PHP knows
|
|
|
|
// attempt to use the iconv extension to
|
|
// cast the XML to a known encoding
|
|
// @see http://php.net/iconv
|
|
|
|
if (function_exists('iconv')) {
|
|
$encoded_source = iconv($in_enc,'UTF-8', $source);
|
|
if ($encoded_source) {
|
|
return array(xml_parser_create('UTF-8'), $encoded_source);
|
|
}
|
|
}
|
|
|
|
// iconv didn't work, try mb_convert_encoding
|
|
// @see http://php.net/mbstring
|
|
if(function_exists('mb_convert_encoding')) {
|
|
$encoded_source = mb_convert_encoding($source, 'UTF-8', $in_enc );
|
|
if ($encoded_source) {
|
|
return array(xml_parser_create('UTF-8'), $encoded_source);
|
|
}
|
|
}
|
|
|
|
// else
|
|
$this->error("Feed is in an unsupported character encoding. ($in_enc) " .
|
|
"You may see strange artifacts, and mangled characters.",
|
|
E_USER_NOTICE);
|
|
|
|
return array(xml_parser_create(), $source);
|
|
}
|
|
|
|
function known_encoding($enc) {
|
|
$enc = strtoupper($enc);
|
|
if ( in_array($enc, $this->_KNOWN_ENCODINGS) ) {
|
|
return $enc;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
function error ($errormsg, $lvl=E_USER_WARNING) {
|
|
// append PHP's error message if track_errors enabled
|
|
if ( isset($php_errormsg) ) {
|
|
$errormsg .= " ($php_errormsg)";
|
|
}
|
|
if ( MAGPIE_DEBUG ) {
|
|
trigger_error( $errormsg, $lvl);
|
|
}
|
|
else {
|
|
error_log( $errormsg, 0);
|
|
}
|
|
|
|
$notices = E_USER_NOTICE|E_NOTICE;
|
|
if ( $lvl&$notices ) {
|
|
$this->WARNING = $errormsg;
|
|
} else {
|
|
$this->ERROR = $errormsg;
|
|
}
|
|
}
|
|
|
|
// magic ID function for multiple elemenets.
|
|
// can be called as static MagpieRSS::element_id()
|
|
function element_id ($el, $counter) {
|
|
return $el . (($counter > 1) ? '#'.$counter : '');
|
|
}
|
|
} // end class RSS
|
|
|
|
function map_attrs($k, $v) {
|
|
return "$k=\"$v\"";
|
|
}
|
|
|
|
// patch to support medieval versions of PHP4.1.x,
|
|
// courtesy, Ryan Currie, ryan@digibliss.com
|
|
|
|
if (!function_exists('array_change_key_case')) {
|
|
define("CASE_UPPER",1);
|
|
define("CASE_LOWER",0);
|
|
|
|
|
|
function array_change_key_case($array,$case=CASE_LOWER) {
|
|
if ($case==CASE_LOWER) $cmd='strtolower';
|
|
elseif ($case==CASE_UPPER) $cmd='strtoupper';
|
|
foreach($array as $key=>$value) {
|
|
$output[$cmd($key)]=$value;
|
|
}
|
|
return $output;
|
|
}
|
|
|
|
}
|
|
|
|
?>
|