magpierss/rss_parse.inc

   1 <?php
   2
   3 /**
   4 * Project:     MagpieRSS: a simple RSS integration tool
   5 * File:        rss_parse.inc  - parse an RSS or Atom feed
   6 *               return as a simple object.
   7 *
   8 * Handles RSS 0.9x, RSS 2.0, RSS 1.0, Atom 0.3, and Atom 1.0
   9 *
  10 * The lastest version of MagpieRSS can be obtained from:
  11 * http://magpierss.sourceforge.net
  12 *
  13 * For questions, help, comments, discussion, etc., please join the
  14 * Magpie mailing list:
  15 * magpierss-general@lists.sourceforge.net
  16 *
  17 * @author           Kellan Elliott-McCrea <kellan@protest.net>
  18 * @version          0.8
  19 * @license          GPL
  20 *
  21 */
  22
  23 define('RSS', 'RSS');
  24 define('ATOM', 'Atom');
  25
  26 require_once (MAGPIE_DIR . 'rss_utils.inc');
  27
  28 /**
  29 * Hybrid parser, and object, takes RSS as a string and returns a simple object.
  30 *
  31 * see: rss_fetch.inc for a simpler interface with integrated caching support
  32 *
  33 */
  34 class MagpieRSS {
  35     var $parser;
  36
  37     var $current_item   = array();  // item currently being parsed
  38     var $items          = array();  // collection of parsed items
  39     var $channel        = array();  // hash of channel fields
  40     var $textinput      = array();
  41     var $image          = array();
  42     var $feed_type;
  43     var $feed_version;
  44     var $encoding       = '';       // output encoding of parsed rss
  45
  46     var $_source_encoding = '';     // only set if we have to parse xml prolog
  47
  48     var $ERROR = "";
  49     var $WARNING = "";
  50
  51     // define some constants
  52
  53     var $_ATOM_CONTENT_CONSTRUCTS = array(
  54         'content', 'summary', 'title', /* common */
  55     'info', 'tagline', 'copyright', /* Atom 0.3 */
  56         'rights', 'subtitle', /* Atom 1.0 */
  57     );
  58     var $_XHTML_CONTENT_CONSTRUCTS = array('body', 'div');
  59     var $_KNOWN_ENCODINGS    = array('UTF-8', 'US-ASCII', 'ISO-8859-1');
  60
  61     // parser variables, useless if you're not a parser, treat as private
  62     var $stack              = array(); // parser stack
  63     var $inchannel          = false;
  64     var $initem             = false;
  65
  66     var $incontent          = array(); // non-empty if in namespaced XML content field
  67     var $exclude_top        = false; // true when Atom 1.0 type="xhtml"
  68
  69     var $intextinput        = false;
  70     var $inimage            = false;
  71     var $current_namespace  = false;
  72
  73     /**
  74      *  Set up XML parser, parse source, and return populated RSS object..
  75      *
  76      *  @param string $source           string containing the RSS to be parsed
  77      *
  78      *  NOTE:  Probably a good idea to leave the encoding options alone unless
  79      *         you know what you're doing as PHP's character set support is
  80      *         a little weird.
  81      *
  82      *  NOTE:  A lot of this is unnecessary but harmless with PHP5
  83      *
  84      *
  85      *  @param string $output_encoding  output the parsed RSS in this character
  86      *                                  set defaults to ISO-8859-1 as this is PHP's
  87      *                                  default.
  88      *
  89      *                                  NOTE: might be changed to UTF-8 in future
  90      *                                  versions.
  91      *
  92      *  @param string $input_encoding   the character set of the incoming RSS source.
  93      *                                  Leave blank and Magpie will try to figure it
  94      *                                  out.
  95      *
  96      *
  97      *  @param bool   $detect_encoding  if false Magpie won't attempt to detect
  98      *                                  source encoding. (caveat emptor)
  99      *
 100      */
 101     function MagpieRSS ($source, $output_encoding='ISO-8859-1',
 102                         $input_encoding=null, $detect_encoding=true)
 103     {
 104         # if PHP xml isn't compiled in, die
 105         #
 106         if (!function_exists('xml_parser_create')) {
 107             $this->error( "Failed to load PHP's XML Extension. " .
 108                           "http://www.php.net/manual/en/ref.xml.php",
 109                            E_USER_ERROR );
 110         }
 111
 112         list($parser, $source) = $this->create_parser($source,
 113                 $output_encoding, $input_encoding, $detect_encoding);
 114
 115
 116         if (!is_resource($parser)) {
 117             $this->error( "Failed to create an instance of PHP's XML parser. " .
 118                           "http://www.php.net/manual/en/ref.xml.php",
 119                           E_USER_ERROR );
 120         }
 121
 122
 123         $this->parser = $parser;
 124
 125         # pass in parser, and a reference to this object
 126         # setup handlers
 127         #
 128         xml_set_object( $this->parser, $this );
 129         xml_set_element_handler($this->parser,
 130                 'feed_start_element', 'feed_end_element' );
 131
 132         xml_set_character_data_handler( $this->parser, 'feed_cdata' );
 133
 134         $status = xml_parse( $this->parser, $source );
 135
 136         if (! $status ) {
 137             $errorcode = xml_get_error_code( $this->parser );
 138             if ( $errorcode != XML_ERROR_NONE ) {
 139                 $xml_error = xml_error_string( $errorcode );
 140                 $error_line = xml_get_current_line_number($this->parser);
 141                 $error_col = xml_get_current_column_number($this->parser);
 142                 $errormsg = "$xml_error at line $error_line, column $error_col";
 143
 144                 $this->error( $errormsg );
 145             }
 146         }
 147
 148         xml_parser_free( $this->parser );
 149
 150         $this->normalize();
 151     }
 152
 153     function feed_start_element($p, $element, &$attrs) {
 154         $el = $element = strtolower($element);
 155         $attrs = array_change_key_case($attrs, CASE_LOWER);
 156
 157         // check for a namespace, and split if found
 158         // Don't munge content tags
 159         if ( empty($this->incontent) ) {
 160                 $ns = false;
 161                 if ( strpos( $element, ':' ) ) {
 162                    list($ns, $el) = split( ':', $element, 2);
 163                 }
 164                 if ( $ns and $ns != 'rdf' ) {
 165                    $this->current_namespace = $ns;
 166                }
 167           }
 168
 169         # if feed type isn't set, then this is first element of feed
 170         # identify feed from root element
 171         #
 172         if (!isset($this->feed_type) ) {
 173             if ( $el == 'rdf' ) {
 174                 $this->feed_type = RSS;
 175                 $this->feed_version = '1.0';
 176             }
 177             elseif ( $el == 'rss' ) {
 178                 $this->feed_type = RSS;
 179                 $this->feed_version = $attrs['version'];
 180             }
 181             elseif ( $el == 'feed' ) {
 182                 $this->feed_type = ATOM;
 183                     if ($attrs['xmlns'] == 'http://www.w3.org/2005/Atom') { // Atom 1.0
 184                         $this->feed_version = '1.0';
 185                     }
 186                     else { // Atom 0.3, probably.
 187                         $this->feed_version = $attrs['version'];
 188                     }
 189                 $this->inchannel = true;
 190             }
 191             return;
 192         }
 193
 194         // if we're inside a namespaced content construct, treat tags as text
 195         if ( !empty($this->incontent) )
 196         {
 197                 if ((count($this->incontent) > 1) or !$this->exclude_top) {
 198                       // if tags are inlined, then flatten
 199                       $attrs_str = join(' ',
 200                           array_map('map_attrs',
 201                           array_keys($attrs),
 202                           array_values($attrs) )
 203                         );
 204
 205                         if (strlen($attrs_str) > 0) { $attrs_str = ' '.$attrs_str; }
 206
 207                         $this->append_content( "<{$element}{$attrs_str}>"  );
 208                 }
 209                 array_push($this->incontent, $el); // stack for parsing content XML
 210         }
 211
 212         elseif ( $el == 'channel' )  {
 213             $this->inchannel = true;
 214         }
 215
 216         elseif ($el == 'item' or $el == 'entry' )
 217         {
 218             $this->initem = true;
 219             if ( isset($attrs['rdf:about']) ) {
 220                 $this->current_item['about'] = $attrs['rdf:about'];
 221             }
 222         }
 223
 224         // if we're in the default namespace of an RSS feed,
 225         //  record textinput or image fields
 226         elseif (
 227             $this->feed_type == RSS and
 228             $this->current_namespace == '' and
 229             $el == 'textinput' )
 230         {
 231             $this->intextinput = true;
 232         }
 233
 234         elseif (
 235             $this->feed_type == RSS and
 236             $this->current_namespace == '' and
 237             $el == 'image' )
 238         {
 239             $this->inimage = true;
 240         }
 241
 242         // set stack[0] to current element
 243         else {
 244               // Atom support many links per containing element.
 245               // Magpie treats link elements of type rel='alternate'
 246               // as being equivalent to RSS's simple link element.
 247
 248               $atom_link = false;
 249               if ($this->feed_type == ATOM and $el == 'link') {
 250                     $atom_link = true;
 251                     if (isset($attrs['rel']) and $attrs['rel'] != 'alternate') {
 252                           $el = $el . "_" . $attrs['rel'];  // pseudo-element names for Atom link elements
 253                     }
 254               }
 255               # handle atom content constructs
 256               elseif ( $this->feed_type == ATOM and in_array($el, $this->_ATOM_CONTENT_CONSTRUCTS) )
 257               {
 258                     // avoid clashing w/ RSS mod_content
 259                     if ($el == 'content' ) {
 260                           $el = 'atom_content';
 261                     }
 262
 263                     // assume that everything accepts namespaced XML
 264                     // (that will pass through some non-validating feeds;
 265                     // but so what? this isn't a validating parser)
 266                     $this->incontent = array();
 267                     array_push($this->incontent, $el); // start a stack
 268
 269                     if ( isset($attrs['type']) and trim(strtolower($attrs['type']))=='xhtml') {
 270                         $this->exclude_top = true;
 271                     } else {
 272                         $this->exclude_top = false;
 273                     }
 274               }
 275               # Handle inline XHTML body elements --CWJ
 276               elseif (($this->current_namespace=='xhtml' or
 277                         (isset($attrs['xmlns']) and $attrs['xmlns'] == 'http://www.w3.org/1999/xhtml'))
 278                       and in_array($el, $this->_XHTML_CONTENT_CONSTRUCTS) )
 279               {
 280                     $this->current_namespace = 'xhtml';
 281                     $this->incontent = array();
 282                     array_push($this->incontent, $el); // start a stack
 283                     $this->exclude_top = false;
 284               }
 285
 286               array_unshift($this->stack, $el);
 287               $elpath = join('_', array_reverse($this->stack));
 288
 289               $n = $this->element_count($elpath);
 290               $this->element_count($elpath, $n+1);
 291
 292               if ($n > 0) {
 293                   array_shift($this->stack);
 294                   array_unshift($this->stack, $el.'#'.($n+1));
 295                   $elpath = join('_', array_reverse($this->stack));
 296               }
 297
 298               // this makes the baby Jesus cry, but we can't do it in normalize()
 299               // because we've made the element name for Atom links unpredictable
 300               // by tacking on the relation to the end. -CWJ
 301               if ($atom_link and isset($attrs['href'])) {
 302                     $this->append($elpath, $attrs['href']);
 303               }
 304
 305               // add attributes
 306               if (count($attrs) > 0) {
 307                     $this->append($elpath.'@', join(',', array_keys($attrs)));
 308                     foreach ($attrs as $attr => $value) {
 309                          $this->append($elpath.'@'.$attr, $value);
 310                     }
 311               }
 312        }
 313     }
 314
 315
 316
 317     function feed_cdata ($p, $text) {
 318
 319         if ($this->incontent) {
 320             $this->append_content( $text );
 321         }
 322         else {
 323             $current_el = join('_', array_reverse($this->stack));
 324             $this->append($current_el, $text);
 325         }
 326     }
 327
 328     function feed_end_element ($p, $el) {
 329         $el = strtolower($el);
 330
 331         if ( $this->incontent ) {
 332         $opener = array_pop($this->incontent);
 333
 334         // Don't get bamboozled by namespace voodoo
 335         if (strpos($el, ':')) { list($ns, $closer) = split(':', $el); }
 336         else { $ns = false; $closer = $el; }
 337
 338         // Don't get bamboozled by our munging of <atom:content>, either
 339         if ($this->feed_type == ATOM and $closer == 'content') {
 340             $closer = 'atom_content';
 341         }
 342
 343         // balance tags properly
 344         // note:  i don't think this is actually neccessary
 345         if ($opener != $closer) {
 346             array_push($this->incontent, $opener);
 347             $this->append_content("<$el />");
 348         } elseif ($this->incontent) { // are we in the content construct still?
 349             if ((count($this->incontent) > 1) or !$this->exclude_top) {
 350                 $this->append_content("</$el>");
 351             }
 352         } else { // shift the opening of the content construct off the normal stack
 353             array_shift( $this->stack );
 354         }
 355         }
 356         elseif ( $el == 'item' or $el == 'entry' )
 357         {
 358             $this->items[] = $this->current_item;
 359             $this->current_item = array();
 360             $this->initem = false;
 361
 362         $this->current_category = 0;
 363         }
 364        elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'textinput' )
 365         {
 366             $this->intextinput = false;
 367         }
 368         elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'image' )
 369         {
 370             $this->inimage = false;
 371         }
 372         elseif ($el == 'channel' or $el == 'feed' )
 373         {
 374             $this->inchannel = false;
 375         }
 376         else {
 377         array_shift( $this->stack );
 378         }
 379
 380     if ( !$this->incontent ) { // Don't munge the namespace after finishing with elements in namespaced content constructs -CWJ
 381         $this->current_namespace = false;
 382     }
 383     }
 384
 385     function concat (&$str1, $str2="") {
 386         if (!isset($str1) ) {
 387             $str1="";
 388         }
 389         $str1 .= $str2;
 390     }
 391
 392     function append_content($text) {
 393     if ( $this->initem ) {
 394         if ($this->current_namespace) {
 395             $this->concat( $this->current_item[$this->current_namespace][ reset($this->incontent) ], $text );
 396         } else {
 397             $this->concat( $this->current_item[ reset($this->incontent) ], $text );
 398         }
 399     }
 400     elseif ( $this->inchannel ) {
 401         if ($this->current_namespace) {
 402             $this->concat( $this->channel[$this->current_namespace][ reset($this->incontent) ], $text );
 403         } else {
 404             $this->concat( $this->channel[ reset($this->incontent) ], $text );
 405         }
 406     }
 407     }
 408
 409     // smart append - field and namespace aware
 410     function append($el, $text) {
 411         if (!$el) {
 412             return;
 413         }
 414         if ( $this->current_namespace )
 415         {
 416             if ( $this->initem ) {
 417             $this->concat(
 418                 $this->current_item[ $this->current_namespace ][ $el ], $text);
 419             }
 420             elseif ($this->inchannel) {
 421         $this->concat(
 422             $this->channel[ $this->current_namespace][ $el ], $text );
 423         }
 424             elseif ($this->intextinput) {
 425                 $this->concat(
 426                     $this->textinput[ $this->current_namespace][ $el ], $text );
 427             }
 428             elseif ($this->inimage) {
 429                 $this->concat(
 430                     $this->image[ $this->current_namespace ][ $el ], $text );
 431             }
 432         }
 433         else {
 434             if ( $this->initem ) {
 435         $this->concat(
 436             $this->current_item[ $el ], $text);
 437             }
 438             elseif ($this->intextinput) {
 439                 $this->concat(
 440                     $this->textinput[ $el ], $text );
 441             }
 442             elseif ($this->inimage) {
 443                 $this->concat(
 444                     $this->image[ $el ], $text );
 445             }
 446             elseif ($this->inchannel) {
 447         $this->concat(
 448             $this->channel[ $el ], $text );
 449             }
 450
 451         }
 452     }
 453
 454     // smart count - field and namespace aware
 455     function element_count ($el, $set = NULL) {
 456         if (!$el) {
 457             return;
 458         }
 459         if ( $this->current_namespace )
 460         {
 461             if ( $this->initem ) {
 462             if (!is_null($set)) { $this->current_item[ $this->current_namespace ][ $el.'#' ] = $set; }
 463             $ret = (isset($this->current_item[ $this->current_namespace ][ $el.'#' ]) ?
 464             $this->current_item[ $this->current_namespace ][ $el.'#' ] : 0);
 465             }
 466             elseif ($this->inchannel) {
 467             if (!is_null($set)) { $this->channel[ $this->current_namespace ][ $el.'#' ] = $set; }
 468             $ret = (isset($this->channel[ $this->current_namespace][ $el.'#' ]) ?
 469             $this->channel[ $this->current_namespace][ $el.'#' ] : 0);
 470         }
 471         }
 472         else {
 473             if ( $this->initem ) {
 474             if (!is_null($set)) { $this->current_item[ $el.'#' ] = $set; }
 475             $ret = (isset($this->current_item[ $el.'#' ]) ?
 476             $this->current_item[ $el.'#' ] : 0);
 477             }
 478             elseif ($this->inchannel) {
 479             if (!is_null($set)) {$this->channel[ $el.'#' ] = $set; }
 480             $ret = (isset($this->channel[ $el.'#' ]) ?
 481             $this->channel[ $el.'#' ] : 0);
 482         }
 483         }
 484     return $ret;
 485     }
 486
 487     function normalize_enclosure (&$source, $from, &$dest, $to, $i) {
 488         $id_from = $this->element_id($from, $i);
 489         $id_to = $this->element_id($to, $i);
 490         if (isset($source["{$id_from}@"])) {
 491             foreach (explode(',', $source["{$id_from}@"]) as $attr) {
 492                 if ($from=='link_enclosure' and $attr=='href') { // from Atom
 493                     $dest["{$id_to}@url"] = $source["{$id_from}@{$attr}"];
 494                     $dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
 495                 }
 496                 elseif ($from=='enclosure' and $attr=='url') { // from RSS
 497                     $dest["{$id_to}@href"] = $source["{$id_from}@{$attr}"];
 498                     $dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
 499                 }
 500                 else {
 501                     $dest["{$id_to}@{$attr}"] = $source["{$id_from}@{$attr}"];
 502                 }
 503             }
 504         }
 505     }
 506
 507     function normalize_atom_person (&$source, $person, &$dest, $to, $i) {
 508         $id = $this->element_id($person, $i);
 509         $id_to = $this->element_id($to, $i);
 510
 511             // Atom 0.3 <=> Atom 1.0
 512         if ($this->feed_version >= 1.0) { $used = 'uri'; $norm = 'url'; }
 513         else { $used = 'url'; $norm = 'uri'; }
 514
 515         if (isset($source["{$id}_{$used}"])) {
 516             $dest["{$id_to}_{$norm}"] = $source["{$id}_{$used}"];
 517         }
 518
 519         // Atom to RSS 2.0 and Dublin Core
 520         // RSS 2.0 person strings should be valid e-mail addresses if possible.
 521         if (isset($source["{$id}_email"])) {
 522             $rss_author = $source["{$id}_email"];
 523         }
 524         if (isset($source["{$id}_name"])) {
 525             $rss_author = $source["{$id}_name"]
 526                 . (isset($rss_author) ? " <$rss_author>" : '');
 527         }
 528         if (isset($rss_author)) {
 529             $source[$id] = $rss_author; // goes to top-level author or contributor
 530         $dest[$id_to] = $rss_author; // goes to dc:creator or dc:contributor
 531         }
 532     }
 533
 534     // Normalize Atom 1.0 and RSS 2.0 categories to Dublin Core...
 535     function normalize_category (&$source, $from, &$dest, $to, $i) {
 536         $cat_id = $this->element_id($from, $i);
 537         $dc_id = $this->element_id($to, $i);
 538
 539         // first normalize category elements: Atom 1.0 <=> RSS 2.0
 540         if ( isset($source["{$cat_id}@term"]) ) { // category identifier
 541             $source[$cat_id] = $source["{$cat_id}@term"];
 542         } elseif ( $this->feed_type == RSS ) {
 543             $source["{$cat_id}@term"] = $source[$cat_id];
 544         }
 545
 546         if ( isset($source["{$cat_id}@scheme"]) ) { // URI to taxonomy
 547             $source["{$cat_id}@domain"] = $source["{$cat_id}@scheme"];
 548         } elseif ( isset($source["{$cat_id}@domain"]) ) {
 549             $source["{$cat_id}@scheme"] = $source["{$cat_id}@domain"];
 550         }
 551
 552         // Now put the identifier into dc:subject
 553         $dest[$dc_id] = $source[$cat_id];
 554     }
 555
 556     // ... or vice versa
 557     function normalize_dc_subject (&$source, $from, &$dest, $to, $i) {
 558         $dc_id = $this->element_id($from, $i);
 559         $cat_id = $this->element_id($to, $i);
 560
 561         $dest[$cat_id] = $source[$dc_id];       // RSS 2.0
 562         $dest["{$cat_id}@term"] = $source[$dc_id];  // Atom 1.0
 563     }
 564
 565     // simplify the logic for normalize(). Makes sure that count of elements and
 566     // each of multiple elements is normalized properly. If you need to mess
 567     // with things like attributes or change formats or the like, pass it a
 568     // callback to handle each element.
 569     function normalize_element (&$source, $from, &$dest, $to, $via = NULL) {
 570         if (isset($source[$from]) or isset($source["{$from}#"])) {
 571             if (isset($source["{$from}#"])) {
 572                 $n = $source["{$from}#"];
 573                 $dest["{$to}#"] = $source["{$from}#"];
 574             }
 575             else { $n = 1; }
 576
 577             for ($i = 1; $i <= $n; $i++) {
 578                 if (isset($via)) { // custom callback for ninja attacks
 579                     $this->{$via}($source, $from, $dest, $to, $i);
 580                 }
 581                 else { // just make it the same
 582                     $from_id = $this->element_id($from, $i);
 583                     $to_id = $this->element_id($to, $i);
 584                     $dest[$to_id] = $source[$from_id];
 585                 }
 586             }
 587         }
 588     }
 589
 590     function normalize () {
 591         // if atom populate rss fields and normalize 0.3 and 1.0 feeds
 592         if ( $this->is_atom() ) {
 593         // Atom 1.0 elements <=> Atom 0.3 elements (Thanks, o brilliant wordsmiths of the Atom 1.0 standard!)
 594         if ($this->feed_version < 1.0) {
 595             $this->normalize_element($this->channel, 'tagline', $this->channel, 'subtitle');
 596             $this->normalize_element($this->channel, 'copyright', $this->channel, 'rights');
 597             $this->normalize_element($this->channel, 'modified', $this->channel, 'updated');
 598         } else {
 599             $this->normalize_element($this->channel, 'subtitle', $this->channel, 'tagline');
 600             $this->normalize_element($this->channel, 'rights', $this->channel, 'copyright');
 601             $this->normalize_element($this->channel, 'updated', $this->channel, 'modified');
 602         }
 603         $this->normalize_element($this->channel, 'author', $this->channel['dc'], 'creator', 'normalize_atom_person');
 604         $this->normalize_element($this->channel, 'contributor', $this->channel['dc'], 'contributor', 'normalize_atom_person');
 605
 606         // Atom elements to RSS elements
 607         $this->normalize_element($this->channel, 'subtitle', $this->channel, 'description');
 608
 609         if ( isset($this->channel['logo']) ) {
 610             $this->normalize_element($this->channel, 'logo', $this->image, 'url');
 611             $this->normalize_element($this->channel, 'link', $this->image, 'link');
 612             $this->normalize_element($this->channel, 'title', $this->image, 'title');
 613         }
 614
 615         for ( $i = 0; $i < count($this->items); $i++) {
 616             $item = $this->items[$i];
 617
 618             // Atom 1.0 elements <=> Atom 0.3 elements
 619             if ($this->feed_version < 1.0) {
 620                 $this->normalize_element($item, 'modified', $item, 'updated');
 621                 $this->normalize_element($item, 'issued', $item, 'published');
 622             } else {
 623                 $this->normalize_element($item, 'updated', $item, 'modified');
 624                 $this->normalize_element($item, 'published', $item, 'issued');
 625             }
 626
 627             // "If an atom:entry element does not contain
 628             // atom:author elements, then the atom:author elements
 629             // of the contained atom:source element are considered
 630             // to apply. In an Atom Feed Document, the atom:author
 631             // elements of the containing atom:feed element are
 632             // considered to apply to the entry if there are no
 633             // atom:author elements in the locations described
 634             // above." <http://atompub.org/2005/08/17/draft-ietf-atompub-format-11.html#rfc.section.4.2.1>
 635             if (!isset($item["author#"])) {
 636                 if (isset($item["source_author#"])) { // from aggregation source
 637                     $source = $item;
 638                     $author = "source_author";
 639                 } elseif (isset($this->channel["author#"])) { // from containing feed
 640                     $source = $this->channel;
 641                     $author = "author";
 642                 }
 643
 644                 $item["author#"] = $source["{$author}#"];
 645                 for ($au = 1; $au <= $item["author#"]; $au++) {
 646                     $id_to = $this->element_id('author', $au);
 647                     $id_from = $this->element_id($author, $au);
 648
 649                     $item[$id_to] = $source[$id_from];
 650                     foreach (array('name', 'email', 'uri', 'url') as $what) {
 651                         if (isset($source["{$id_from}_{$what}"])) {
 652                             $item["{$id_to}_{$what}"] = $source["{$id_from}_{$what}"];
 653                         }
 654                     }
 655                 }
 656             }
 657
 658             // Atom elements to RSS elements
 659             $this->normalize_element($item, 'author', $item['dc'], 'creator', 'normalize_atom_person');
 660             $this->normalize_element($item, 'contributor', $item['dc'], 'contributor', 'normalize_atom_person');
 661             $this->normalize_element($item, 'summary', $item, 'description');
 662             $this->normalize_element($item, 'atom_content', $item['content'], 'encoded');
 663             $this->normalize_element($item, 'link_enclosure', $item, 'enclosure', 'normalize_enclosure');
 664
 665             // Categories
 666             if ( isset($item['category#']) ) { // Atom 1.0 categories to dc:subject and RSS 2.0 categories
 667                 $this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
 668             }
 669             elseif ( isset($item['dc']['subject#']) ) { // dc:subject to Atom 1.0 and RSS 2.0 categories
 670                 $this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
 671             }
 672
 673             // Normalized item timestamp
 674             $atom_date = (isset($item['published']) ) ? $item['published'] : $item['updated'];
 675             if ( $atom_date ) {
 676                 $epoch = @parse_w3cdtf($atom_date);
 677                 if ($epoch and $epoch > 0) {
 678                     $item['date_timestamp'] = $epoch;
 679                 }
 680             }
 681
 682             $this->items[$i] = $item;
 683         }
 684         }
 685         elseif ( $this->is_rss() ) {
 686         // RSS elements to Atom elements
 687         $this->normalize_element($this->channel, 'description', $this->channel, 'tagline'); // Atom 0.3
 688         $this->normalize_element($this->channel, 'description', $this->channel, 'subtitle'); // Atom 1.0 (yay wordsmithing!)
 689         $this->normalize_element($this->image, 'url', $this->channel, 'logo');
 690
 691             for ( $i = 0; $i < count($this->items); $i++) {
 692                 $item = $this->items[$i];
 693
 694         // RSS elements to Atom elements
 695         $this->normalize_element($item, 'description', $item, 'summary');
 696                 $this->normalize_element($item['content'], 'encoded', $item, 'atom_content');
 697         $this->normalize_element($item, 'enclosure', $item, 'link_enclosure', 'normalize_enclosure');
 698
 699         // Categories
 700         if ( isset($item['category#']) ) { // RSS 2.0 categories to dc:subject and Atom 1.0 categories
 701             $this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
 702         }
 703         elseif ( isset($item['dc']['subject#']) ) { // dc:subject to Atom 1.0 and RSS 2.0 categories
 704             $this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
 705         }
 706
 707         // Normalized item timestamp
 708                 if ( $this->is_rss() == '1.0' and isset($item['dc']['date']) ) {
 709                     $epoch = @parse_w3cdtf($item['dc']['date']);
 710                     if ($epoch and $epoch > 0) {
 711                         $item['date_timestamp'] = $epoch;
 712                     }
 713                 }
 714                 elseif ( isset($item['pubdate']) ) {
 715                     $epoch = @strtotime($item['pubdate']);
 716                     if ($epoch > 0) {
 717                         $item['date_timestamp'] = $epoch;
 718                     }
 719                 }
 720
 721                 $this->items[$i] = $item;
 722             }
 723         }
 724     }
 725
 726
 727     function is_rss () {
 728         if ( $this->feed_type == RSS ) {
 729             return $this->feed_version;
 730         }
 731         else {
 732             return false;
 733         }
 734     }
 735
 736     function is_atom() {
 737         if ( $this->feed_type == ATOM ) {
 738             return $this->feed_version;
 739         }
 740         else {
 741             return false;
 742         }
 743     }
 744
 745     /**
 746     * return XML parser, and possibly re-encoded source
 747     *
 748     */
 749     function create_parser($source, $out_enc, $in_enc, $detect) {
 750         if ( substr(phpversion(),0,1) == 5) {
 751             $parser = $this->php5_create_parser($in_enc, $detect);
 752         }
 753         else {
 754             list($parser, $source) = $this->php4_create_parser($source, $in_enc, $detect);
 755         }
 756         if ($out_enc) {
 757             $this->encoding = $out_enc;
 758             xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $out_enc);
 759         }
 760
 761         return array($parser, $source);
 762     }
 763
 764     /**
 765     * Instantiate an XML parser under PHP5
 766     *
 767     * PHP5 will do a fine job of detecting input encoding
 768     * if passed an empty string as the encoding.
 769     *
 770     * All hail libxml2!
 771     *
 772     */
 773     function php5_create_parser($in_enc, $detect) {
 774         // by default php5 does a fine job of detecting input encodings
 775         if(!$detect && $in_enc) {
 776             return xml_parser_create($in_enc);
 777         }
 778         else {
 779             return xml_parser_create('');
 780         }
 781     }
 782
 783     /**
 784     * Instaniate an XML parser under PHP4
 785     *
 786     * Unfortunately PHP4's support for character encodings
 787     * and especially XML and character encodings sucks.  As
 788     * long as the documents you parse only contain characters
 789     * from the ISO-8859-1 character set (a superset of ASCII,
 790     * and a subset of UTF-8) you're fine.  However once you
 791     * step out of that comfy little world things get mad, bad,
 792     * and dangerous to know.
 793     *
 794     * The following code is based on SJM's work with FoF
 795     * @see http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
 796     *
 797     */
 798     function php4_create_parser($source, $in_enc, $detect) {
 799         if ( !$detect ) {
 800             return array(xml_parser_create($in_enc), $source);
 801         }
 802
 803         if (!$in_enc) {
 804             if (preg_match('/<?xml.*encoding=[\'"](.*?)[\'"].*?>/m', $source, $m)) {
 805                 $in_enc = strtoupper($m[1]);
 806                 $this->source_encoding = $in_enc;
 807             }
 808             else {
 809                 $in_enc = 'UTF-8';
 810             }
 811         }
 812
 813         if ($this->known_encoding($in_enc)) {
 814             return array(xml_parser_create($in_enc), $source);
 815         }
 816
 817         // the dectected encoding is not one of the simple encodings PHP knows
 818
 819         // attempt to use the iconv extension to
 820         // cast the XML to a known encoding
 821         // @see http://php.net/iconv
 822
 823         if (function_exists('iconv'))  {
 824             $encoded_source = iconv($in_enc,'UTF-8', $source);
 825             if ($encoded_source) {
 826                 return array(xml_parser_create('UTF-8'), $encoded_source);
 827             }
 828         }
 829
 830         // iconv didn't work, try mb_convert_encoding
 831         // @see http://php.net/mbstring
 832         if(function_exists('mb_convert_encoding')) {
 833             $encoded_source = mb_convert_encoding($source, 'UTF-8', $in_enc );
 834             if ($encoded_source) {
 835                 return array(xml_parser_create('UTF-8'), $encoded_source);
 836             }
 837         }
 838
 839         // else
 840         $this->error("Feed is in an unsupported character encoding. ($in_enc) " .
 841                      "You may see strange artifacts, and mangled characters.",
 842                      E_USER_NOTICE);
 843
 844         return array(xml_parser_create(), $source);
 845     }
 846
 847     function known_encoding($enc) {
 848         $enc = strtoupper($enc);
 849         if ( in_array($enc, $this->_KNOWN_ENCODINGS) ) {
 850             return $enc;
 851         }
 852         else {
 853             return false;
 854         }
 855     }
 856
 857     function error ($errormsg, $lvl=E_USER_WARNING) {
 858         // append PHP's error message if track_errors enabled
 859         if ( isset($php_errormsg) ) {
 860             $errormsg .= " ($php_errormsg)";
 861         }
 862         if ( MAGPIE_DEBUG ) {
 863             trigger_error( $errormsg, $lvl);
 864         }
 865         else {
 866             error_log( $errormsg, 0);
 867         }
 868
 869         $notices = E_USER_NOTICE|E_NOTICE;
 870         if ( $lvl&$notices ) {
 871             $this->WARNING = $errormsg;
 872         } else {
 873             $this->ERROR = $errormsg;
 874         }
 875     }
 876
 877     // magic ID function for multiple elemenets.
 878     // can be called as static MagpieRSS::element_id()
 879     function element_id ($el, $counter) {
 880         return $el . (($counter > 1) ? '#'.$counter : '');
 881     }
 882 } // end class RSS
 883
 884 function map_attrs($k, $v) {
 885     return "$k=\"$v\"";
 886 }
 887
 888 // patch to support medieval versions of PHP4.1.x,
 889 // courtesy, Ryan Currie, ryan@digibliss.com
 890
 891 if (!function_exists('array_change_key_case')) {
 892     define("CASE_UPPER",1);
 893     define("CASE_LOWER",0);
 894
 895
 896     function array_change_key_case($array,$case=CASE_LOWER) {
 897        if ($case==CASE_LOWER) $cmd='strtolower';
 898        elseif ($case==CASE_UPPER) $cmd='strtoupper';
 899        foreach($array as $key=>$value) {
 900                $output[$cmd($key)]=$value;
 901        }
 902        return $output;
 903     }
 904
 905 }
 906
 907 ?>