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0a0fef8 @kellan Initial commit. 0.72 release brought over from Sourceforge.
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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 *
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8 * Handles RSS 0.9x, RSS 2.0, RSS 1.0, Atom 0.3, and Atom 1.0
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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>
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18 * @version 0.8
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19 * @license GPL
20 *
21 */
22
23 define('RSS', 'RSS');
24 define('ATOM', 'Atom');
25
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26 if (!defined('MAGPIE_DIR')) {
27 define('MAGPIE_DIR', dirname(__FILE__) . DIRECTORY_SEPARATOR);
28 }
29
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30 require_once (MAGPIE_DIR . 'rss_utils.inc');
31
32 /**
33 * Hybrid parser, and object, takes RSS as a string and returns a simple object.
34 *
35 * see: rss_fetch.inc for a simpler interface with integrated caching support
36 *
37 */
38 class MagpieRSS {
39 var $parser;
40
41 var $current_item = array(); // item currently being parsed
42 var $items = array(); // collection of parsed items
43 var $channel = array(); // hash of channel fields
44 var $textinput = array();
45 var $image = array();
46 var $feed_type;
47 var $feed_version;
48 var $encoding = ''; // output encoding of parsed rss
49
50 var $_source_encoding = ''; // only set if we have to parse xml prolog
51
52 var $ERROR = "";
53 var $WARNING = "";
54
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55 # define some constants
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56
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57 var $_ATOM_CONTENT_CONSTRUCTS = array(
58 'content', 'summary', 'title', /* common */
59 'info', 'tagline', 'copyright', /* Atom 0.3 */
60 'rights', 'subtitle', /* Atom 1.0 */
61 );
62
63 var $_XHTML_CONTENT_CONSTRUCTS = array('body', 'div');
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64 var $_KNOWN_ENCODINGS = array('UTF-8', 'US-ASCII', 'ISO-8859-1');
65
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66 # parser variables, useless if you're not a parser, treat as private
67
68 var $stack = array(); # parser stack
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69 var $inchannel = false;
70 var $initem = false;
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71
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72 var $incontent = array(); # non-empty if in namespaced XML content field
73 var $exclude_top = false; # true when Atom 1.0 type="xhtml"
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74
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75 var $intextinput = false;
76 var $inimage = false;
77 var $current_namespace = false;
78
79 /**
80 * Set up XML parser, parse source, and return populated RSS object..
81 *
82 * @param string $source string containing the RSS to be parsed
83 *
84 * NOTE: Probably a good idea to leave the encoding options alone unless
85 * you know what you're doing as PHP's character set support is
86 * a little weird.
87 *
88 * NOTE: A lot of this is unnecessary but harmless with PHP5
89 *
90 *
91 * @param string $output_encoding output the parsed RSS in this character
92 * set defaults to ISO-8859-1 as this is PHP's
93 * default.
94 *
95 * NOTE: might be changed to UTF-8 in future
96 * versions.
97 *
98 * @param string $input_encoding the character set of the incoming RSS source.
99 * Leave blank and Magpie will try to figure it
100 * out.
101 *
102 *
103 * @param bool $detect_encoding if false Magpie won't attempt to detect
104 * source encoding. (caveat emptor)
105 *
106 */
107 function MagpieRSS ($source, $output_encoding='ISO-8859-1',
108 $input_encoding=null, $detect_encoding=true)
109 {
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110 #
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111 # if PHP xml isn't compiled in, die
112 #
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113
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114 if (!function_exists('xml_parser_create')) {
115 $this->error( "Failed to load PHP's XML Extension. " .
116 "http://www.php.net/manual/en/ref.xml.php",
117 E_USER_ERROR );
118 }
119
120 list($parser, $source) = $this->create_parser($source,
121 $output_encoding, $input_encoding, $detect_encoding);
122
123
124 if (!is_resource($parser)) {
125 $this->error( "Failed to create an instance of PHP's XML parser. " .
126 "http://www.php.net/manual/en/ref.xml.php",
127 E_USER_ERROR );
128 }
129
130 $this->parser = $parser;
131
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132 #
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133 # pass in parser, and a reference to this object
134 # setup handlers
135 #
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136
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137 xml_set_object( $this->parser, $this );
138 xml_set_element_handler($this->parser,
139 'feed_start_element', 'feed_end_element' );
140
141 xml_set_character_data_handler( $this->parser, 'feed_cdata' );
142
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143 $status = xml_parse( $this->parser, $source ); # parse the feed
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144
145 if (! $status ) {
146 $errorcode = xml_get_error_code( $this->parser );
147 if ( $errorcode != XML_ERROR_NONE ) {
148 $xml_error = xml_error_string( $errorcode );
149 $error_line = xml_get_current_line_number($this->parser);
150 $error_col = xml_get_current_column_number($this->parser);
151 $errormsg = "$xml_error at line $error_line, column $error_col";
152
153 $this->error( $errormsg );
154 }
155 }
156
157 xml_parser_free( $this->parser );
158
159 $this->normalize();
160 }
161
162 function feed_start_element($p, $element, &$attrs) {
163 $el = $element = strtolower($element);
164 $attrs = array_change_key_case($attrs, CASE_LOWER);
165
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166 # check for a namespace, and split if found
167 # only if we're not inside a content tag
168
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169 if ( empty($this->incontent) ) {
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170 $ns = false;
171
172 if ( strpos( $element, ':' ) ) {
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173 list($ns, $el) = explode( ':', $element, 2); //split is deprecated
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174 }
175
176 if ( $ns and $ns != 'rdf' ) {
177 $this->current_namespace = $ns;
178 }
179 }
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180
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181 #
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182 # if feed type isn't set, then this is first element of feed
183 # identify feed from root element
184 #
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185
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186 if (!isset($this->feed_type) ) {
187 if ( $el == 'rdf' ) {
188 $this->feed_type = RSS;
189 $this->feed_version = '1.0';
190 }
191 elseif ( $el == 'rss' ) {
192 $this->feed_type = RSS;
193 $this->feed_version = $attrs['version'];
194 }
195 elseif ( $el == 'feed' ) {
196 $this->feed_type = ATOM;
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197
198 if ($attrs['xmlns'] == 'http://www.w3.org/2005/Atom') { // Atom 1.0
199 $this->feed_version = '1.0';
200 }
201 else {
202 # Atom 0.3, probably.
203 $this->feed_version = $attrs['version'];
204 }
205
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206 $this->inchannel = true;
207 }
208 return;
209 }
210
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211 #
212 # if we're inside a namespaced content construct, treat tags as text
213 #
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214
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215 if ( !empty($this->incontent) ) {
216 if ((count($this->incontent) > 1) or !$this->exclude_top) {
217
218 # if tags are inlined, then flatten
219
220 $attrs_str = join(' ',
221 array_map('map_attrs',
222 array_keys($attrs),
223 array_values($attrs))
224 );
225
226 if (strlen($attrs_str)) {
227 $attrs_str = ' '.$attrs_str;
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228 }
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229
230 $this->append_content( "<{$element}{$attrs_str}>" );
231 }
232
233 array_push($this->incontent, $el); # stack for parsing content XML
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234 }
235
236 elseif ( $el == 'channel' ) {
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237 $this->inchannel = true;
238 }
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239
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240 elseif ($el == 'item' or $el == 'entry' )
241 {
242 $this->initem = true;
243 if ( isset($attrs['rdf:about']) ) {
244 $this->current_item['about'] = $attrs['rdf:about'];
245 }
246 }
247 elseif (
248 $this->feed_type == RSS and
249 $this->current_namespace == '' and
250 $el == 'textinput' )
251 {
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252 # else we're in the default namespace of an RSS feed,
253 # record textinput or image fields
254
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255 $this->intextinput = true;
256 }
257 elseif (
258 $this->feed_type == RSS and
259 $this->current_namespace == '' and
260 $el == 'image' )
261 {
262 $this->inimage = true;
263 }
264 else {
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265 // set stack[0] to current element
266
267 # Atom support many links per containing element.
268 # Magpie treats link elements of type rel='alternate'
269 # as being equivalent to RSS's simple link element.
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270
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271 $atom_link = false;
272
273 if ($this->feed_type == ATOM and $el == 'link') {
274 $atom_link = true;
275 if (isset($attrs['rel']) and $attrs['rel'] != 'alternate') {
276 $el = $el . "_" . $attrs['rel']; // pseudo-element names for Atom link elements
277 }
278 }
279 elseif ( $this->feed_type == ATOM and
280 in_array($el, $this->_ATOM_CONTENT_CONSTRUCTS) )
281 {
282 # handle atom content constructs
283
284 # avoid clashing w/ RSS mod_content
285 if ($el == 'content' ) {
286 $el = 'atom_content';
287 }
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288
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289 #
290 # assume that everything accepts namespaced XML
291 # (that will pass through some non-validating feeds;
292 # but so what? this isn't a validating parser)
293 #
294
295 $this->incontent = array();
296 array_push($this->incontent, $el); // start a stack
297
298 if ( isset($attrs['type']) and trim(strtolower($attrs['type']))=='xhtml') {
299 $this->exclude_top = true;
300 } else {
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301 $this->exclude_top = false;
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302 }
303 }
304 elseif (($this->current_namespace=='xhtml' or
305 (isset($attrs['xmlns']) and $attrs['xmlns'] == 'http://www.w3.org/1999/xhtml'))
306 and in_array($el, $this->_XHTML_CONTENT_CONSTRUCTS) )
307 {
308 # Handle inline XHTML body elements --CWJ
309
310 $this->current_namespace = 'xhtml';
311 $this->incontent = array();
312 array_push($this->incontent, $el); // start a stack
313 $this->exclude_top = false;
314 }
315
316 array_unshift($this->stack, $el);
317 $elpath = join('_', array_reverse($this->stack));
318
319 $n = $this->element_count($elpath);
320 $this->element_count($elpath, $n+1);
321
322 if ($n > 0) {
323 array_shift($this->stack);
324 array_unshift($this->stack, $el.'#'.($n+1)); # TODO: revisit this
325 $elpath = join('_', array_reverse($this->stack));
326 }
327
328 # this makes the baby Jesus cry, but we can't do it in normalize()
329 # because we've made the element name for Atom links unpredictable
330 # by tacking on the relation to the end. -CWJ
331
332 if ($atom_link and isset($attrs['href'])) {
333 $this->append($elpath, $attrs['href']);
334 }
335
336 # add attributes
337 if (count($attrs) > 0) {
338 $this->append($elpath.'@', join(',', array_keys($attrs)));
339 foreach ($attrs as $attr => $value) {
340 $this->append($elpath.'@'.$attr, $value);
341 }
342 }
343 }
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344 }
345
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346
347
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348 function feed_cdata ($p, $text) {
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349
350 if ($this->incontent) {
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351 $this->append_content( $text );
352 }
353 else {
354 $current_el = join('_', array_reverse($this->stack));
355 $this->append($current_el, $text);
356 }
357 }
358
359 function feed_end_element ($p, $el) {
360 $el = strtolower($el);
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361
362 if ( $this->incontent ) {
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363 $opener = array_pop($this->incontent);
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364
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365 # Don't get bamboozled by namespace voodoo
366 if (strpos($el, ':')) {
367 list($ns, $closer) = split(':', $el);
368 }
369 else {
370 $ns = false; $closer = $el;
371 }
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372
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373 # Don't get bamboozled by our munging of <atom:content>, either
374 if ($this->feed_type == ATOM and $closer == 'content') {
375 $closer = 'atom_content';
376 }
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377
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378 # balance tags properly
379 # NOTE: i don't think this is actually neccessary
380
381 if ($opener != $closer) {
382 array_push($this->incontent, $opener);
383 $this->append_content("<$el />");
384 }
385 elseif ($this->incontent) {
386 # in the content construct
387
388 if ((count($this->incontent) > 1) or !$this->exclude_top) {
389 $this->append_content("</$el>");
390 }
391 }
392 else {
393 # shift the opening of the content construct off the normal stack
394 array_shift( $this->stack );
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395 }
396 }
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397 elseif ( $el == 'item' or $el == 'entry' ) {
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398 $this->items[] = $this->current_item;
399 $this->current_item = array();
400 $this->initem = false;
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401
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402 $this->current_category = 0;
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403 }
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404 elseif ($this->feed_type == RSS and
405 $this->current_namespace == '' and $el == 'textinput' ) {
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406 $this->intextinput = false;
407 }
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408 elseif ($this->feed_type == RSS and
409 $this->current_namespace == '' and $el == 'image' ) {
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410 $this->inimage = false;
411 }
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412 elseif ($el == 'channel' or $el == 'feed' ) {
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413 $this->inchannel = false;
414 }
415 else {
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416 array_shift( $this->stack );
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417 }
418
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419 if ( !$this->incontent ) {
420 # Don't munge the namespace after finishing with elements in namespaced content constructs -CWJ
421 $this->current_namespace = false;
422 }
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423 }
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424
425 function concat (&$str1, $str2="") {
426 if (!isset($str1) ) {
427 $str1="";
428 }
429 $str1 .= $str2;
430 }
431
432 function append_content($text) {
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433 if ( $this->initem ) {
434 if ($this->current_namespace) {
435 $this->concat( $this->current_item[$this->current_namespace][ reset($this->incontent) ], $text );
436 } else {
437 $this->concat( $this->current_item[ reset($this->incontent) ], $text );
438 }
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439 }
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440 elseif ( $this->inchannel ) {
441 if ($this->current_namespace) {
442 $this->concat( $this->channel[$this->current_namespace][ reset($this->incontent) ], $text );
443 }
444 else {
445 $this->concat( $this->channel[ reset($this->incontent) ], $text );
446 }
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447 }
448 }
449
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450 # smart append - field and namespace aware
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451 function append($el, $text) {
452 if (!$el) {
453 return;
454 }
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455
456 if ( $this->current_namespace ) {
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457 if ( $this->initem ) {
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458 $this->concat(
459 $this->current_item[ $this->current_namespace ][ $el ], $text );
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460 }
461 elseif ($this->inchannel) {
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462 $this->concat(
463 $this->channel[ $this->current_namespace][ $el ], $text );
464 }
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465 elseif ($this->intextinput) {
466 $this->concat(
467 $this->textinput[ $this->current_namespace][ $el ], $text );
468 }
469 elseif ($this->inimage) {
470 $this->concat(
471 $this->image[ $this->current_namespace ][ $el ], $text );
472 }
473 }
474 else {
475 if ( $this->initem ) {
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476 $this->concat( $this->current_item[ $el ], $text );
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477 }
478 elseif ($this->intextinput) {
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479 $this->concat( $this->textinput[ $el ], $text );
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480 }
481 elseif ($this->inimage) {
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482 $this->concat( $this->image[ $el ], $text );
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483 }
484 elseif ($this->inchannel) {
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485 $this->concat( $this->channel[ $el ], $text );
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486 }
487
488 }
489 }
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490
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491 # smart count - field and namespace aware
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492 function element_count ($el, $set = NULL) {
493 if (!$el) {
494 return;
495 }
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496
497 if ( $this->current_namespace ) {
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498 if ( $this->initem ) {
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499 if (!is_null($set)) {
500 $this->current_item[ $this->current_namespace ][ $el.'#' ] = $set;
501 }
502
503 $ret = (isset($this->current_item[ $this->current_namespace ][ $el.'#' ]) ?
504 $this->current_item[ $this->current_namespace ][ $el.'#' ] : 0);
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505 }
506 elseif ($this->inchannel) {
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507 if (!is_null($set)) {
508 $this->channel[ $this->current_namespace ][ $el.'#' ] = $set;
509 }
510
511 $ret = (isset($this->channel[ $this->current_namespace][ $el.'#' ]) ?
512 $this->channel[ $this->current_namespace][ $el.'#' ] : 0);
513 }
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514 }
515 else {
516 if ( $this->initem ) {
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517 if (!is_null($set)) {
518 $this->current_item[ $el.'#' ] = $set;
519 }
520
521 $ret = (isset($this->current_item[ $el.'#' ]) ?
522 $this->current_item[ $el.'#' ] : 0);
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523 }
524 elseif ($this->inchannel) {
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525 if (!is_null($set)) {
526 $this->channel[ $el.'#' ] = $set;
527 }
528
529 $ret = (isset($this->channel[ $el.'#' ]) ?
530 $this->channel[ $el.'#' ] : 0);
531 }
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532 }
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533
534 return $ret;
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535 }
536
537 function normalize_enclosure (&$source, $from, &$dest, $to, $i) {
538 $id_from = $this->element_id($from, $i);
539 $id_to = $this->element_id($to, $i);
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540
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541 if (isset($source["{$id_from}@"])) {
542 foreach (explode(',', $source["{$id_from}@"]) as $attr) {
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543 if ($from=='link_enclosure' and $attr=='href') {
544 # from Atom
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545 $dest["{$id_to}@url"] = $source["{$id_from}@{$attr}"];
546 $dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
547 }
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548 elseif ($from=='enclosure' and $attr=='url') {
549 # from RSS
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550 $dest["{$id_to}@href"] = $source["{$id_from}@{$attr}"];
551 $dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
552 }
553 else {
554 $dest["{$id_to}@{$attr}"] = $source["{$id_from}@{$attr}"];
555 }
556 }
557 }
558 }
559
560 function normalize_atom_person (&$source, $person, &$dest, $to, $i) {
561 $id = $this->element_id($person, $i);
562 $id_to = $this->element_id($to, $i);
563
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564 # Atom 0.3 <=> Atom 1.0
565 if ($this->feed_version >= 1.0) {
566 $used = 'uri'; $norm = 'url';
567 }
568 else {
569 $used = 'url'; $norm = 'uri';
570 }
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571
572 if (isset($source["{$id}_{$used}"])) {
573 $dest["{$id_to}_{$norm}"] = $source["{$id}_{$used}"];
574 }
575
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576 # Atom to RSS 2.0 and Dublin Core
577 # RSS 2.0 person strings should be valid e-mail addresses if possible.
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578 if (isset($source["{$id}_email"])) {
579 $rss_author = $source["{$id}_email"];
580 }
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581
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582 if (isset($source["{$id}_name"])) {
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583 $rss_author = $source["{$id}_name"] . (isset($rss_author) ? " <$rss_author>" : '');
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584 }
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585
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586 if (isset($rss_author)) {
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587 $source[$id] = $rss_author; # goes to top-level author or contributor
588 $dest[$id_to] = $rss_author; # goes to dc:creator or dc:contributor
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589 }
590 }
591
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592 # Normalize Atom 1.0 and RSS 2.0 categories to Dublin Core...
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593 function normalize_category (&$source, $from, &$dest, $to, $i) {
594 $cat_id = $this->element_id($from, $i);
595 $dc_id = $this->element_id($to, $i);
596
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597 # first normalize category elements: Atom 1.0 <=> RSS 2.0
598 if ( isset($source["{$cat_id}@term"]) ) {
599 # category identifier
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600 $source[$cat_id] = $source["{$cat_id}@term"];
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601 }
602 elseif ( $this->feed_type == RSS ) {
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603 $source["{$cat_id}@term"] = $source[$cat_id];
604 }
605
606 if ( isset($source["{$cat_id}@scheme"]) ) { // URI to taxonomy
607 $source["{$cat_id}@domain"] = $source["{$cat_id}@scheme"];
608 } elseif ( isset($source["{$cat_id}@domain"]) ) {
609 $source["{$cat_id}@scheme"] = $source["{$cat_id}@domain"];
610 }
611
612 // Now put the identifier into dc:subject
613 $dest[$dc_id] = $source[$cat_id];
614 }
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615
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616 # ... or vice versa
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617 function normalize_dc_subject (&$source, $from, &$dest, $to, $i) {
618 $dc_id = $this->element_id($from, $i);
619 $cat_id = $this->element_id($to, $i);
620
621 $dest[$cat_id] = $source[$dc_id]; // RSS 2.0
622 $dest["{$cat_id}@term"] = $source[$dc_id]; // Atom 1.0
623 }
624
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625 # simplify the logic for normalize(). Makes sure that count of elements and
626 # each of multiple elements is normalized properly. If you need to mess
627 # with things like attributes or change formats or the like, pass it a
628 # callback to handle each element.
629
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630 function normalize_element (&$source, $from, &$dest, $to, $via = NULL) {
631 if (isset($source[$from]) or isset($source["{$from}#"])) {
632 if (isset($source["{$from}#"])) {
633 $n = $source["{$from}#"];
634 $dest["{$to}#"] = $source["{$from}#"];
635 }
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636 else {
637 $n = 1;
638 }
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639
640 for ($i = 1; $i <= $n; $i++) {
641 if (isset($via)) { // custom callback for ninja attacks
642 $this->{$via}($source, $from, $dest, $to, $i);
643 }
644 else { // just make it the same
645 $from_id = $this->element_id($from, $i);
646 $to_id = $this->element_id($to, $i);
647 $dest[$to_id] = $source[$from_id];
648 }
649 }
650 }
651 }
652
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653 function normalize () {
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654 // if atom populate rss fields and normalize 0.3 and 1.0 feeds
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655
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656 if ( $this->is_atom() ) {
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657 // Atom 1.0 elements <=> Atom 0.3 elements (Thanks, o brilliant wordsmiths of the Atom 1.0 standard!)
658 if ($this->feed_version < 1.0) {
659 $this->normalize_element($this->channel, 'tagline', $this->channel, 'subtitle');
660 $this->normalize_element($this->channel, 'copyright', $this->channel, 'rights');
661 $this->normalize_element($this->channel, 'modified', $this->channel, 'updated');
662 }
663 else {
664 $this->normalize_element($this->channel, 'subtitle', $this->channel, 'tagline');
665 $this->normalize_element($this->channel, 'rights', $this->channel, 'copyright');
666 $this->normalize_element($this->channel, 'updated', $this->channel, 'modified');
667 }
668
669 $this->normalize_element($this->channel, 'author', $this->channel['dc'], 'creator', 'normalize_atom_person');
670 $this->normalize_element($this->channel, 'contributor', $this->channel['dc'], 'contributor', 'normalize_atom_person');
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671
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672 // Atom elements to RSS elements
673 $this->normalize_element($this->channel, 'subtitle', $this->channel, 'description');
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674
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675 if ( isset($this->channel['logo']) ) {
676 $this->normalize_element($this->channel, 'logo', $this->image, 'url');
677 $this->normalize_element($this->channel, 'link', $this->image, 'link');
678 $this->normalize_element($this->channel, 'title', $this->image, 'title');
679 }
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680
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681 for ( $i = 0; $i < count($this->items); $i++) {
682 $item = $this->items[$i];
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683
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684 // Atom 1.0 elements <=> Atom 0.3 elements
685 if ($this->feed_version < 1.0) {
686 $this->normalize_element($item, 'modified', $item, 'updated');
687 $this->normalize_element($item, 'issued', $item, 'published');
688 } else {
689 $this->normalize_element($item, 'updated', $item, 'modified');
690 $this->normalize_element($item, 'published', $item, 'issued');
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691 }
692
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693 // "If an atom:entry element does not contain
694 // atom:author elements, then the atom:author elements
695 // of the contained atom:source element are considered
696 // to apply. In an Atom Feed Document, the atom:author
697 // elements of the containing atom:feed element are
698 // considered to apply to the entry if there are no
699 // atom:author elements in the locations described
700 // above." <http://atompub.org/2005/08/17/draft-ietf-atompub-format-11.html#rfc.section.4.2.1>
701 if (!isset($item["author#"])) {
702 if (isset($item["source_author#"])) { // from aggregation source
703 $source = $item;
704 $author = "source_author";
705 } elseif (isset($this->channel["author#"])) { // from containing feed
706 $source = $this->channel;
707 $author = "author";
708 }
709
710 $item["author#"] = $source["{$author}#"];
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711
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712 for ($au = 1; $au <= $item["author#"]; $au++) {
713 $id_to = $this->element_id('author', $au);
714 $id_from = $this->element_id($author, $au);
715
716 $item[$id_to] = $source[$id_from];
717
718 foreach (array('name', 'email', 'uri', 'url') as $what) {
719 if (isset($source["{$id_from}_{$what}"])) {
720 $item["{$id_to}_{$what}"] = $source["{$id_from}_{$what}"];
721 }
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722 }
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723 }
724 }
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725
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726 // Atom elements to RSS elements
727 $this->normalize_element($item, 'author', $item['dc'], 'creator', 'normalize_atom_person');
728 $this->normalize_element($item, 'contributor', $item['dc'], 'contributor', 'normalize_atom_person');
729 $this->normalize_element($item, 'summary', $item, 'description');
730 $this->normalize_element($item, 'atom_content', $item['content'], 'encoded');
731 $this->normalize_element($item, 'link_enclosure', $item, 'enclosure', 'normalize_enclosure');
732
733 // Categories
734 if ( isset($item['category#']) ) {
735 # Atom 1.0 categories to dc:subject and RSS 2.0 categories
736 $this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
737 }
738 elseif ( isset($item['dc']['subject#']) ) {
739 # dc:subject to Atom 1.0 and RSS 2.0 categories
740 $this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
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741 }
742
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743 // Normalized item timestamp
744 $atom_date = (isset($item['published']) ) ? $item['published'] : $item['updated'];
745
746 if ( $atom_date ) {
747 $epoch = @parse_w3cdtf($atom_date);
748
749 if ($epoch and $epoch > 0) {
750 $item['date_timestamp'] = $epoch;
751 }
752 }
753
754 $this->items[$i] = $item;
755 }
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756 }
757 elseif ( $this->is_rss() ) {
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758 // RSS elements to Atom elements
759 $this->normalize_element($this->channel, 'description', $this->channel, 'tagline'); // Atom 0.3
760 $this->normalize_element($this->channel, 'description', $this->channel, 'subtitle'); // Atom 1.0 (yay wordsmithing!)
761 $this->normalize_element($this->image, 'url', $this->channel, 'logo');
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762
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763 for ( $i = 0; $i < count($this->items); $i++) {
764 $item = $this->items[$i];
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765
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766 // RSS elements to Atom elements
767 $this->normalize_element($item, 'description', $item, 'summary');
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768 $this->normalize_element($item['content'], 'encoded', $item, 'atom_content');
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769 $this->normalize_element($item, 'enclosure', $item, 'link_enclosure', 'normalize_enclosure');
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770
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771 // Categories
772 if ( isset($item['category#']) ) {
773 # RSS 2.0 categories to dc:subject and Atom 1.0 categories
774 $this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
775 }
776 elseif ( isset($item['dc']['subject#']) ) {
777 # dc:subject to Atom 1.0 and RSS 2.0 categories
778 $this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
779 }
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780
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781 // Normalized item timestamp
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782 if ( $this->is_rss() == '1.0' and isset($item['dc']['date']) ) {
783 $epoch = @parse_w3cdtf($item['dc']['date']);
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784
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785 if ($epoch and $epoch > 0) {
786 $item['date_timestamp'] = $epoch;
787 }
788 }
789 elseif ( isset($item['pubdate']) ) {
790 $epoch = @strtotime($item['pubdate']);
791 if ($epoch > 0) {
792 $item['date_timestamp'] = $epoch;
793 }
794 }
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795
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796 $this->items[$i] = $item;
797 }
798 }
799 }
800
801
802 function is_rss () {
803 if ( $this->feed_type == RSS ) {
804 return $this->feed_version;
805 }
806 else {
807 return false;
808 }
809 }
810
811 function is_atom() {
812 if ( $this->feed_type == ATOM ) {
813 return $this->feed_version;
814 }
815 else {
816 return false;
817 }
818 }
819
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820 #
821 # return XML parser, and possibly re-encoded source
822 #
823
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824 function create_parser($source, $out_enc, $in_enc, $detect) {
825 if ( substr(phpversion(),0,1) == 5) {
826 $parser = $this->php5_create_parser($in_enc, $detect);
827 }
828 else {
829 list($parser, $source) = $this->php4_create_parser($source, $in_enc, $detect);
830 }
831 if ($out_enc) {
832 $this->encoding = $out_enc;
833 xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $out_enc);
834 }
835
836 return array($parser, $source);
837 }
838
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839 #
840 # Instantiate an XML parser under PHP5
841 #
842 # PHP5 will do a fine job of detecting input encoding
843 # if passed an empty string as the encoding.
844 #
845 # All hail libxml2!
846 #
847
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848 function php5_create_parser($in_enc, $detect) {
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849
850 # by default php5 does a fine job of detecting input encodings
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851 if(!$detect && $in_enc) {
852 return xml_parser_create($in_enc);
853 }
854 else {
855 return xml_parser_create('');
856 }
857 }
858
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859 #
860 # Instaniate an XML parser under PHP4
861 #
862 # Unfortunately PHP4's support for character encodings
863 # and especially XML and character encodings sucks. As
864 # long as the documents you parse only contain characters
865 # from the ISO-8859-1 character set (a superset of ASCII,
866 # and a subset of UTF-8) you're fine. However once you
867 # step out of that comfy little world things get mad, bad,
868 # and dangerous to know.
869 #
870 # The following code is based on SJM's work with FoF
871 # @see http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
872 #
873
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874 function php4_create_parser($source, $in_enc, $detect) {
875 if ( !$detect ) {
876 return array(xml_parser_create($in_enc), $source);
877 }
878
879 if (!$in_enc) {
880 if (preg_match('/<?xml.*encoding=[\'"](.*?)[\'"].*?>/m', $source, $m)) {
881 $in_enc = strtoupper($m[1]);
882 $this->source_encoding = $in_enc;
883 }
884 else {
885 $in_enc = 'UTF-8';
886 }
887 }
888
889 if ($this->known_encoding($in_enc)) {
890 return array(xml_parser_create($in_enc), $source);
891 }
892
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893 # the dectected encoding is not one of the simple encodings PHP knows
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894
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895 # attempt to use the iconv extension to
896 # cast the XML to a known encoding
897 # @see http://php.net/iconv
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898
899 if (function_exists('iconv')) {
900 $encoded_source = iconv($in_enc,'UTF-8', $source);
901 if ($encoded_source) {
902 return array(xml_parser_create('UTF-8'), $encoded_source);
903 }
904 }
905
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906 # iconv didn't work, try mb_convert_encoding
907 # @see http://php.net/mbstring
908
909 if( function_exists('mb_convert_encoding')) {
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910 $encoded_source = mb_convert_encoding($source, 'UTF-8', $in_enc );
911 if ($encoded_source) {
912 return array(xml_parser_create('UTF-8'), $encoded_source);
913 }
914 }
915
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916 #
917 # else
918 #
919
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920 $this->error("Feed is in an unsupported character encoding. ($in_enc) " .
921 "You may see strange artifacts, and mangled characters.",
922 E_USER_NOTICE);
923
924 return array(xml_parser_create(), $source);
925 }
926
927 function known_encoding($enc) {
928 $enc = strtoupper($enc);
929 if ( in_array($enc, $this->_KNOWN_ENCODINGS) ) {
930 return $enc;
931 }
932 else {
933 return false;
934 }
935 }
936
937 function error ($errormsg, $lvl=E_USER_WARNING) {
938 // append PHP's error message if track_errors enabled
939 if ( isset($php_errormsg) ) {
940 $errormsg .= " ($php_errormsg)";
941 }
942 if ( MAGPIE_DEBUG ) {
943 trigger_error( $errormsg, $lvl);
944 }
945 else {
946 error_log( $errormsg, 0);
947 }
948
949 $notices = E_USER_NOTICE|E_NOTICE;
950 if ( $lvl&$notices ) {
951 $this->WARNING = $errormsg;
952 } else {
953 $this->ERROR = $errormsg;
954 }
955 }
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956
957 // magic ID function for multiple elemenets.
958 // can be called as static MagpieRSS::element_id()
959 function element_id ($el, $counter) {
960 return $el . (($counter > 1) ? '#'.$counter : '');
961 }
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962 } // end class RSS
963
964 function map_attrs($k, $v) {
965 return "$k=\"$v\"";
966 }
967
968 // patch to support medieval versions of PHP4.1.x,
969 // courtesy, Ryan Currie, ryan@digibliss.com
970
971 if (!function_exists('array_change_key_case')) {
60dc31f @kellan the unreleased 0.8 version, adds repeating elements, attributes, and …
authored
972 define("CASE_UPPER",1);
973 define("CASE_LOWER",0);
0a0fef8 @kellan Initial commit. 0.72 release brought over from Sourceforge.
authored
974
975
60dc31f @kellan the unreleased 0.8 version, adds repeating elements, attributes, and …
authored
976 function array_change_key_case($array,$case=CASE_LOWER) {
bb7c917 @kellan clean up formatting
authored
977 if ($case==CASE_LOWER) {
978 $cmd='strtolower';
979 }
980 elseif ($case==CASE_UPPER) {
981 $cmd='strtoupper';
982 }
0a0fef8 @kellan Initial commit. 0.72 release brought over from Sourceforge.
authored
983
bb7c917 @kellan clean up formatting
authored
984 foreach($array as $key=>$value) {
985 $output[$cmd($key)]=$value;
986 }
0a0fef8 @kellan Initial commit. 0.72 release brought over from Sourceforge.
authored
987
bb7c917 @kellan clean up formatting
authored
988 return $output;
989 }
990 }
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