1 <?php
2 /**
3 * SimplePie
4 *
5 * A PHP-Based RSS and Atom Feed Framework.
6 * Takes the hard work out of managing a complete RSS/Atom solution.
7 *
8 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without modification, are
12 * permitted provided that the following conditions are met:
13 *
14 * * Redistributions of source code must retain the above copyright notice, this list of
15 * conditions and the following disclaimer.
16 *
17 * * Redistributions in binary form must reproduce the above copyright notice, this list
18 * of conditions and the following disclaimer in the documentation and/or other materials
19 * provided with the distribution.
20 *
21 * * Neither the name of the SimplePie Team nor the names of its contributors may be used
22 * to endorse or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
26 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
28 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 *
35 * @package SimplePie
36 * @version 1.3.1
37 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
38 * @author Ryan Parman
39 * @author Geoffrey Sneddon
40 * @author Ryan McCue
41 * @link http://simplepie.org/ SimplePie
42 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
43 */
44
45 /**
46 * IRI parser/serialiser/normaliser
47 *
48 * @package SimplePie
49 * @subpackage HTTP
50 * @author Geoffrey Sneddon
51 * @author Steve Minutillo
52 * @author Ryan McCue
53 * @copyright 2007-2012 Geoffrey Sneddon, Steve Minutillo, Ryan McCue
54 * @license http://www.opensource.org/licenses/bsd-license.php
55 */
56 class SimplePie_IRI
57 {
58 /**
59 * Scheme
60 *
61 * @var string
62 */
63 protected $scheme = null;
64
65 /**
66 * User Information
67 *
68 * @var string
69 */
70 protected $iuserinfo = null;
71
72 /**
73 * ihost
74 *
75 * @var string
76 */
77 protected $ihost = null;
78
79 /**
80 * Port
81 *
82 * @var string
83 */
84 protected $port = null;
85
86 /**
87 * ipath
88 *
89 * @var string
90 */
91 protected $ipath = '';
92
93 /**
94 * iquery
95 *
96 * @var string
97 */
98 protected $iquery = null;
99
100 /**
101 * ifragment
102 *
103 * @var string
104 */
105 protected $ifragment = null;
106
107 /**
108 * Normalization database
109 *
110 * Each key is the scheme, each value is an array with each key as the IRI
111 * part and value as the default value for that part.
112 */
113 protected $normalization = array(
114 'acap' => array(
115 'port' => 674
116 ),
117 'dict' => array(
118 'port' => 2628
119 ),
120 'file' => array(
121 'ihost' => 'localhost'
122 ),
123 'http' => array(
124 'port' => 80,
125 'ipath' => '/'
126 ),
127 'https' => array(
128 'port' => 443,
129 'ipath' => '/'
130 ),
131 );
132
133 /**
134 * Return the entire IRI when you try and read the object as a string
135 *
136 * @return string
137 */
138 public function __toString()
139 {
140 return $this->get_iri();
141 }
142
143 /**
144 * Overload __set() to provide access via properties
145 *
146 * @param string $name Property name
147 * @param mixed $value Property value
148 */
149 public function __set($name, $value)
150 {
151 if (method_exists($this, 'set_' . $name))
152 {
153 call_user_func(array($this, 'set_' . $name), $value);
154 }
155 elseif (
156 $name === 'iauthority'
157 || $name === 'iuserinfo'
158 || $name === 'ihost'
159 || $name === 'ipath'
160 || $name === 'iquery'
161 || $name === 'ifragment'
162 )
163 {
164 call_user_func(array($this, 'set_' . substr($name, 1)), $value);
165 }
166 }
167
168 /**
169 * Overload __get() to provide access via properties
170 *
171 * @param string $name Property name
172 * @return mixed
173 */
174 public function __get($name)
175 {
176 // isset() returns false for null, we don't want to do that
177 // Also why we use array_key_exists below instead of isset()
178 $props = get_object_vars($this);
179
180 if (
181 $name === 'iri' ||
182 $name === 'uri' ||
183 $name === 'iauthority' ||
184 $name === 'authority'
185 )
186 {
187 $return = $this->{"get_$name"}();
188 }
189 elseif (array_key_exists($name, $props))
190 {
191 $return = $this->$name;
192 }
193 // host -> ihost
194 elseif (($prop = 'i' . $name) && array_key_exists($prop, $props))
195 {
196 $name = $prop;
197 $return = $this->$prop;
198 }
199 // ischeme -> scheme
200 elseif (($prop = substr($name, 1)) && array_key_exists($prop, $props))
201 {
202 $name = $prop;
203 $return = $this->$prop;
204 }
205 else
206 {
207 trigger_error('Undefined property: ' . get_class($this) . '::' . $name, E_USER_NOTICE);
208 $return = null;
209 }
210
211 if ($return === null && isset($this->normalization[$this->scheme][$name]))
212 {
213 return $this->normalization[$this->scheme][$name];
214 }
215 else
216 {
217 return $return;
218 }
219 }
220
221 /**
222 * Overload __isset() to provide access via properties
223 *
224 * @param string $name Property name
225 * @return bool
226 */
227 public function __isset($name)
228 {
229 if (method_exists($this, 'get_' . $name) || isset($this->$name))
230 {
231 return true;
232 }
233 else
234 {
235 return false;
236 }
237 }
238
239 /**
240 * Overload __unset() to provide access via properties
241 *
242 * @param string $name Property name
243 */
244 public function __unset($name)
245 {
246 if (method_exists($this, 'set_' . $name))
247 {
248 call_user_func(array($this, 'set_' . $name), '');
249 }
250 }
251
252 /**
253 * Create a new IRI object, from a specified string
254 *
255 * @param string $iri
256 */
257 public function __construct($iri = null)
258 {
259 $this->set_iri($iri);
260 }
261
262 /**
263 * Create a new IRI object by resolving a relative IRI
264 *
265 * Returns false if $base is not absolute, otherwise an IRI.
266 *
267 * @param IRI|string $base (Absolute) Base IRI
268 * @param IRI|string $relative Relative IRI
269 * @return IRI|false
270 */
271 public static function absolutize($base, $relative)
272 {
273 if (!($relative instanceof SimplePie_IRI))
274 {
275 $relative = new SimplePie_IRI($relative);
276 }
277 if (!$relative->is_valid())
278 {
279 return false;
280 }
281 elseif ($relative->scheme !== null)
282 {
283 return clone $relative;
284 }
285 else
286 {
287 if (!($base instanceof SimplePie_IRI))
288 {
289 $base = new SimplePie_IRI($base);
290 }
291 if ($base->scheme !== null && $base->is_valid())
292 {
293 if ($relative->get_iri() !== '')
294 {
295 if ($relative->iuserinfo !== null || $relative->ihost !== null || $relative->port !== null)
296 {
297 $target = clone $relative;
298 $target->scheme = $base->scheme;
299 }
300 else
301 {
302 $target = new SimplePie_IRI;
303 $target->scheme = $base->scheme;
304 $target->iuserinfo = $base->iuserinfo;
305 $target->ihost = $base->ihost;
306 $target->port = $base->port;
307 if ($relative->ipath !== '')
308 {
309 if ($relative->ipath[0] === '/')
310 {
311 $target->ipath = $relative->ipath;
312 }
313 elseif (($base->iuserinfo !== null || $base->ihost !== null || $base->port !== null) && $base->ipath === '')
314 {
315 $target->ipath = '/' . $relative->ipath;
316 }
317 elseif (($last_segment = strrpos($base->ipath, '/')) !== false)
318 {
319 $target->ipath = substr($base->ipath, 0, $last_segment + 1) . $relative->ipath;
320 }
321 else
322 {
323 $target->ipath = $relative->ipath;
324 }
325 $target->ipath = $target->remove_dot_segments($target->ipath);
326 $target->iquery = $relative->iquery;
327 }
328 else
329 {
330 $target->ipath = $base->ipath;
331 if ($relative->iquery !== null)
332 {
333 $target->iquery = $relative->iquery;
334 }
335 elseif ($base->iquery !== null)
336 {
337 $target->iquery = $base->iquery;
338 }
339 }
340 $target->ifragment = $relative->ifragment;
341 }
342 }
343 else
344 {
345 $target = clone $base;
346 $target->ifragment = null;
347 }
348 $target->scheme_normalization();
349 return $target;
350 }
351 else
352 {
353 return false;
354 }
355 }
356 }
357
358 /**
359 * Parse an IRI into scheme/authority/path/query/fragment segments
360 *
361 * @param string $iri
362 * @return array
363 */
364 protected function parse_iri($iri)
365 {
366 $iri = trim($iri, "\x20\x09\x0A\x0C\x0D");
367 if (preg_match('/^((?P<scheme>[^:\/?#]+):)?(\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(\?(?P<query>[^#]*))?(#(?P<fragment>.*))?$/', $iri, $match))
368 {
369 if ($match[1] === '')
370 {
371 $match['scheme'] = null;
372 }
373 if (!isset($match[3]) || $match[3] === '')
374 {
375 $match['authority'] = null;
376 }
377 if (!isset($match[5]))
378 {
379 $match['path'] = '';
380 }
381 if (!isset($match[6]) || $match[6] === '')
382 {
383 $match['query'] = null;
384 }
385 if (!isset($match[8]) || $match[8] === '')
386 {
387 $match['fragment'] = null;
388 }
389 return $match;
390 }
391 else
392 {
393 // This can occur when a paragraph is accidentally parsed as a URI
394 return false;
395 }
396 }
397
398 /**
399 * Remove dot segments from a path
400 *
401 * @param string $input
402 * @return string
403 */
404 protected function remove_dot_segments($input)
405 {
406 $output = '';
407 while (strpos($input, './') !== false || strpos($input, '/.') !== false || $input === '.' || $input === '..')
408 {
409 // A: If the input buffer begins with a prefix of "../" or "./", then remove that prefix from the input buffer; otherwise,
410 if (strpos($input, '../') === 0)
411 {
412 $input = substr($input, 3);
413 }
414 elseif (strpos($input, './') === 0)
415 {
416 $input = substr($input, 2);
417 }
418 // B: if the input buffer begins with a prefix of "/./" or "/.", where "." is a complete path segment, then replace that prefix with "/" in the input buffer; otherwise,
419 elseif (strpos($input, '/./') === 0)
420 {
421 $input = substr($input, 2);
422 }
423 elseif ($input === '/.')
424 {
425 $input = '/';
426 }
427 // C: if the input buffer begins with a prefix of "/../" or "/..", where ".." is a complete path segment, then replace that prefix with "/" in the input buffer and remove the last segment and its preceding "/" (if any) from the output buffer; otherwise,
428 elseif (strpos($input, '/../') === 0)
429 {
430 $input = substr($input, 3);
431 $output = substr_replace($output, '', strrpos($output, '/'));
432 }
433 elseif ($input === '/..')
434 {
435 $input = '/';
436 $output = substr_replace($output, '', strrpos($output, '/'));
437 }
438 // D: if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise,
439 elseif ($input === '.' || $input === '..')
440 {
441 $input = '';
442 }
443 // E: move the first path segment in the input buffer to the end of the output buffer, including the initial "/" character (if any) and any subsequent characters up to, but not including, the next "/" character or the end of the input buffer
444 elseif (($pos = strpos($input, '/', 1)) !== false)
445 {
446 $output .= substr($input, 0, $pos);
447 $input = substr_replace($input, '', 0, $pos);
448 }
449 else
450 {
451 $output .= $input;
452 $input = '';
453 }
454 }
455 return $output . $input;
456 }
457
458 /**
459 * Replace invalid character with percent encoding
460 *
461 * @param string $string Input string
462 * @param string $extra_chars Valid characters not in iunreserved or
463 * iprivate (this is ASCII-only)
464 * @param bool $iprivate Allow iprivate
465 * @return string
466 */
467 protected function replace_invalid_with_pct_encoding($string, $extra_chars, $iprivate = false)
468 {
469 // Normalize as many pct-encoded sections as possible
470 $string = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', array($this, 'remove_iunreserved_percent_encoded'), $string);
471
472 // Replace invalid percent characters
473 $string = preg_replace('/%(?![A-Fa-f0-9]{2})/', '%25', $string);
474
475 // Add unreserved and % to $extra_chars (the latter is safe because all
476 // pct-encoded sections are now valid).
477 $extra_chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~%';
478
479 // Now replace any bytes that aren't allowed with their pct-encoded versions
480 $position = 0;
481 $strlen = strlen($string);
482 while (($position += strspn($string, $extra_chars, $position)) < $strlen)
483 {
484 $value = ord($string[$position]);
485
486 // Start position
487 $start = $position;
488
489 // By default we are valid
490 $valid = true;
491
492 // No one byte sequences are valid due to the while.
493 // Two byte sequence:
494 if (($value & 0xE0) === 0xC0)
495 {
496 $character = ($value & 0x1F) << 6;
497 $length = 2;
498 $remaining = 1;
499 }
500 // Three byte sequence:
501 elseif (($value & 0xF0) === 0xE0)
502 {
503 $character = ($value & 0x0F) << 12;
504 $length = 3;
505 $remaining = 2;
506 }
507 // Four byte sequence:
508 elseif (($value & 0xF8) === 0xF0)
509 {
510 $character = ($value & 0x07) << 18;
511 $length = 4;
512 $remaining = 3;
513 }
514 // Invalid byte:
515 else
516 {
517 $valid = false;
518 $length = 1;
519 $remaining = 0;
520 }
521
522 if ($remaining)
523 {
524 if ($position + $length <= $strlen)
525 {
526 for ($position++; $remaining; $position++)
527 {
528 $value = ord($string[$position]);
529
530 // Check that the byte is valid, then add it to the character:
531 if (($value & 0xC0) === 0x80)
532 {
533 $character |= ($value & 0x3F) << (--$remaining * 6);
534 }
535 // If it is invalid, count the sequence as invalid and reprocess the current byte:
536 else
537 {
538 $valid = false;
539 $position--;
540 break;
541 }
542 }
543 }
544 else
545 {
546 $position = $strlen - 1;
547 $valid = false;
548 }
549 }
550
551 // Percent encode anything invalid or not in ucschar
552 if (
553 // Invalid sequences
554 !$valid
555 // Non-shortest form sequences are invalid
556 || $length > 1 && $character <= 0x7F
557 || $length > 2 && $character <= 0x7FF
558 || $length > 3 && $character <= 0xFFFF
559 // Outside of range of ucschar codepoints
560 // Noncharacters
561 || ($character & 0xFFFE) === 0xFFFE
562 || $character >= 0xFDD0 && $character <= 0xFDEF
563 || (
564 // Everything else not in ucschar
565 $character > 0xD7FF && $character < 0xF900
566 || $character < 0xA0
567 || $character > 0xEFFFD
568 )
569 && (
570 // Everything not in iprivate, if it applies
571 !$iprivate
572 || $character < 0xE000
573 || $character > 0x10FFFD
574 )
575 )
576 {
577 // If we were a character, pretend we weren't, but rather an error.
578 if ($valid)
579 $position--;
580
581 for ($j = $start; $j <= $position; $j++)
582 {
583 $string = substr_replace($string, sprintf('%%%02X', ord($string[$j])), $j, 1);
584 $j += 2;
585 $position += 2;
586 $strlen += 2;
587 }
588 }
589 }
590
591 return $string;
592 }
593
594 /**
595 * Callback function for preg_replace_callback.
596 *
597 * Removes sequences of percent encoded bytes that represent UTF-8
598 * encoded characters in iunreserved
599 *
600 * @param array $match PCRE match
601 * @return string Replacement
602 */
603 protected function remove_iunreserved_percent_encoded($match)
604 {
605 // As we just have valid percent encoded sequences we can just explode
606 // and ignore the first member of the returned array (an empty string).
607 $bytes = explode('%', $match[0]);
608
609 // Initialize the new string (this is what will be returned) and that
610 // there are no bytes remaining in the current sequence (unsurprising
611 // at the first byte!).
612 $string = '';
613 $remaining = 0;
614
615 // Loop over each and every byte, and set $value to its value
616 for ($i = 1, $len = count($bytes); $i < $len; $i++)
617 {
618 $value = hexdec($bytes[$i]);
619
620 // If we're the first byte of sequence:
621 if (!$remaining)
622 {
623 // Start position
624 $start = $i;
625
626 // By default we are valid
627 $valid = true;
628
629 // One byte sequence:
630 if ($value <= 0x7F)
631 {
632 $character = $value;
633 $length = 1;
634 }
635 // Two byte sequence:
636 elseif (($value & 0xE0) === 0xC0)
637 {
638 $character = ($value & 0x1F) << 6;
639 $length = 2;
640 $remaining = 1;
641 }
642 // Three byte sequence:
643 elseif (($value & 0xF0) === 0xE0)
644 {
645 $character = ($value & 0x0F) << 12;
646 $length = 3;
647 $remaining = 2;
648 }
649 // Four byte sequence:
650 elseif (($value & 0xF8) === 0xF0)
651 {
652 $character = ($value & 0x07) << 18;
653 $length = 4;
654 $remaining = 3;
655 }
656 // Invalid byte:
657 else
658 {
659 $valid = false;
660 $remaining = 0;
661 }
662 }
663 // Continuation byte:
664 else
665 {
666 // Check that the byte is valid, then add it to the character:
667 if (($value & 0xC0) === 0x80)
668 {
669 $remaining--;
670 $character |= ($value & 0x3F) << ($remaining * 6);
671 }
672 // If it is invalid, count the sequence as invalid and reprocess the current byte as the start of a sequence:
673 else
674 {
675 $valid = false;
676 $remaining = 0;
677 $i--;
678 }
679 }
680
681 // If we've reached the end of the current byte sequence, append it to Unicode::$data
682 if (!$remaining)
683 {
684 // Percent encode anything invalid or not in iunreserved
685 if (
686 // Invalid sequences
687 !$valid
688 // Non-shortest form sequences are invalid
689 || $length > 1 && $character <= 0x7F
690 || $length > 2 && $character <= 0x7FF
691 || $length > 3 && $character <= 0xFFFF
692 // Outside of range of iunreserved codepoints
693 || $character < 0x2D
694 || $character > 0xEFFFD
695 // Noncharacters
696 || ($character & 0xFFFE) === 0xFFFE
697 || $character >= 0xFDD0 && $character <= 0xFDEF
698 // Everything else not in iunreserved (this is all BMP)
699 || $character === 0x2F
700 || $character > 0x39 && $character < 0x41
701 || $character > 0x5A && $character < 0x61
702 || $character > 0x7A && $character < 0x7E
703 || $character > 0x7E && $character < 0xA0
704 || $character > 0xD7FF && $character < 0xF900
705 )
706 {
707 for ($j = $start; $j <= $i; $j++)
708 {
709 $string .= '%' . strtoupper($bytes[$j]);
710 }
711 }
712 else
713 {
714 for ($j = $start; $j <= $i; $j++)
715 {
716 $string .= chr(hexdec($bytes[$j]));
717 }
718 }
719 }
720 }
721
722 // If we have any bytes left over they are invalid (i.e., we are
723 // mid-way through a multi-byte sequence)
724 if ($remaining)
725 {
726 for ($j = $start; $j < $len; $j++)
727 {
728 $string .= '%' . strtoupper($bytes[$j]);
729 }
730 }
731
732 return $string;
733 }
734
735 protected function scheme_normalization()
736 {
737 if (isset($this->normalization[$this->scheme]['iuserinfo']) && $this->iuserinfo === $this->normalization[$this->scheme]['iuserinfo'])
738 {
739 $this->iuserinfo = null;
740 }
741 if (isset($this->normalization[$this->scheme]['ihost']) && $this->ihost === $this->normalization[$this->scheme]['ihost'])
742 {
743 $this->ihost = null;
744 }
745 if (isset($this->normalization[$this->scheme]['port']) && $this->port === $this->normalization[$this->scheme]['port'])
746 {
747 $this->port = null;
748 }
749 if (isset($this->normalization[$this->scheme]['ipath']) && $this->ipath === $this->normalization[$this->scheme]['ipath'])
750 {
751 $this->ipath = '';
752 }
753 if (isset($this->normalization[$this->scheme]['iquery']) && $this->iquery === $this->normalization[$this->scheme]['iquery'])
754 {
755 $this->iquery = null;
756 }
757 if (isset($this->normalization[$this->scheme]['ifragment']) && $this->ifragment === $this->normalization[$this->scheme]['ifragment'])
758 {
759 $this->ifragment = null;
760 }
761 }
762
763 /**
764 * Check if the object represents a valid IRI. This needs to be done on each
765 * call as some things change depending on another part of the IRI.
766 *
767 * @return bool
768 */
769 public function is_valid()
770 {
771 $isauthority = $this->iuserinfo !== null || $this->ihost !== null || $this->port !== null;
772 if ($this->ipath !== '' &&
773 (
774 $isauthority && (
775 $this->ipath[0] !== '/' ||
776 substr($this->ipath, 0, 2) === '//'
777 ) ||
778 (
779 $this->scheme === null &&
780 !$isauthority &&
781 strpos($this->ipath, ':') !== false &&
782 (strpos($this->ipath, '/') === false ? true : strpos($this->ipath, ':') < strpos($this->ipath, '/'))
783 )
784 )
785 )
786 {
787 return false;
788 }
789
790 return true;
791 }
792
793 /**
794 * Set the entire IRI. Returns true on success, false on failure (if there
795 * are any invalid characters).
796 *
797 * @param string $iri
798 * @return bool
799 */
800 public function set_iri($iri)
801 {
802 static $cache;
803 if (!$cache)
804 {
805 $cache = array();
806 }
807
808 if ($iri === null)
809 {
810 return true;
811 }
812 elseif (isset($cache[$iri]))
813 {
814 list($this->scheme,
815 $this->iuserinfo,
816 $this->ihost,
817 $this->port,
818 $this->ipath,
819 $this->iquery,
820 $this->ifragment,
821 $return) = $cache[$iri];
822 return $return;
823 }
824 else
825 {
826 $parsed = $this->parse_iri((string) $iri);
827 if (!$parsed)
828 {
829 return false;
830 }
831
832 $return = $this->set_scheme($parsed['scheme'])
833 && $this->set_authority($parsed['authority'])
834 && $this->set_path($parsed['path'])
835 && $this->set_query($parsed['query'])
836 && $this->set_fragment($parsed['fragment']);
837
838 $cache[$iri] = array($this->scheme,
839 $this->iuserinfo,
840 $this->ihost,
841 $this->port,
842 $this->ipath,
843 $this->iquery,
844 $this->ifragment,
845 $return);
846 return $return;
847 }
848 }
849
850 /**
851 * Set the scheme. Returns true on success, false on failure (if there are
852 * any invalid characters).
853 *
854 * @param string $scheme
855 * @return bool
856 */
857 public function set_scheme($scheme)
858 {
859 if ($scheme === null)
860 {
861 $this->scheme = null;
862 }
863 elseif (!preg_match('/^[A-Za-z][0-9A-Za-z+\-.]*$/', $scheme))
864 {
865 $this->scheme = null;
866 return false;
867 }
868 else
869 {
870 $this->scheme = strtolower($scheme);
871 }
872 return true;
873 }
874
875 /**
876 * Set the authority. Returns true on success, false on failure (if there are
877 * any invalid characters).
878 *
879 * @param string $authority
880 * @return bool
881 */
882 public function set_authority($authority)
883 {
884 static $cache;
885 if (!$cache)
886 $cache = array();
887
888 if ($authority === null)
889 {
890 $this->iuserinfo = null;
891 $this->ihost = null;
892 $this->port = null;
893 return true;
894 }
895 elseif (isset($cache[$authority]))
896 {
897 list($this->iuserinfo,
898 $this->ihost,
899 $this->port,
900 $return) = $cache[$authority];
901
902 return $return;
903 }
904 else
905 {
906 $remaining = $authority;
907 if (($iuserinfo_end = strrpos($remaining, '@')) !== false)
908 {
909 $iuserinfo = substr($remaining, 0, $iuserinfo_end);
910 $remaining = substr($remaining, $iuserinfo_end + 1);
911 }
912 else
913 {
914 $iuserinfo = null;
915 }
916 if (($port_start = strpos($remaining, ':', strpos($remaining, ']'))) !== false)
917 {
918 if (($port = substr($remaining, $port_start + 1)) === false)
919 {
920 $port = null;
921 }
922 $remaining = substr($remaining, 0, $port_start);
923 }
924 else
925 {
926 $port = null;
927 }
928
929 $return = $this->set_userinfo($iuserinfo) &&
930 $this->set_host($remaining) &&
931 $this->set_port($port);
932
933 $cache[$authority] = array($this->iuserinfo,
934 $this->ihost,
935 $this->port,
936 $return);
937
938 return $return;
939 }
940 }
941
942 /**
943 * Set the iuserinfo.
944 *
945 * @param string $iuserinfo
946 * @return bool
947 */
948 public function set_userinfo($iuserinfo)
949 {
950 if ($iuserinfo === null)
951 {
952 $this->iuserinfo = null;
953 }
954 else
955 {
956 $this->iuserinfo = $this->replace_invalid_with_pct_encoding($iuserinfo, '!$&\'()*+,;=:');
957 $this->scheme_normalization();
958 }
959
960 return true;
961 }
962
963 /**
964 * Set the ihost. Returns true on success, false on failure (if there are
965 * any invalid characters).
966 *
967 * @param string $ihost
968 * @return bool
969 */
970 public function set_host($ihost)
971 {
972 if ($ihost === null)
973 {
974 $this->ihost = null;
975 return true;
976 }
977 elseif (substr($ihost, 0, 1) === '[' && substr($ihost, -1) === ']')
978 {
979 if (SimplePie_Net_IPv6::check_ipv6(substr($ihost, 1, -1)))
980 {
981 $this->ihost = '[' . SimplePie_Net_IPv6::compress(substr($ihost, 1, -1)) . ']';
982 }
983 else
984 {
985 $this->ihost = null;
986 return false;
987 }
988 }
989 else
990 {
991 $ihost = $this->replace_invalid_with_pct_encoding($ihost, '!$&\'()*+,;=');
992
993 // Lowercase, but ignore pct-encoded sections (as they should
994 // remain uppercase). This must be done after the previous step
995 // as that can add unescaped characters.
996 $position = 0;
997 $strlen = strlen($ihost);
998 while (($position += strcspn($ihost, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ%', $position)) < $strlen)
999 {
1000 if ($ihost[$position] === '%')
1001 {
1002 $position += 3;
1003 }
1004 else
1005 {
1006 $ihost[$position] = strtolower($ihost[$position]);
1007 $position++;
1008 }
1009 }
1010
1011 $this->ihost = $ihost;
1012 }
1013
1014 $this->scheme_normalization();
1015
1016 return true;
1017 }
1018
1019 /**
1020 * Set the port. Returns true on success, false on failure (if there are
1021 * any invalid characters).
1022 *
1023 * @param string $port
1024 * @return bool
1025 */
1026 public function set_port($port)
1027 {
1028 if ($port === null)
1029 {
1030 $this->port = null;
1031 return true;
1032 }
1033 elseif (strspn($port, '0123456789') === strlen($port))
1034 {
1035 $this->port = (int) $port;
1036 $this->scheme_normalization();
1037 return true;
1038 }
1039 else
1040 {
1041 $this->port = null;
1042 return false;
1043 }
1044 }
1045
1046 /**
1047 * Set the ipath.
1048 *
1049 * @param string $ipath
1050 * @return bool
1051 */
1052 public function set_path($ipath)
1053 {
1054 static $cache;
1055 if (!$cache)
1056 {
1057 $cache = array();
1058 }
1059
1060 $ipath = (string) $ipath;
1061
1062 if (isset($cache[$ipath]))
1063 {
1064 $this->ipath = $cache[$ipath][(int) ($this->scheme !== null)];
1065 }
1066 else
1067 {
1068 $valid = $this->replace_invalid_with_pct_encoding($ipath, '!$&\'()*+,;=@:/');
1069 $removed = $this->remove_dot_segments($valid);
1070
1071 $cache[$ipath] = array($valid, $removed);
1072 $this->ipath = ($this->scheme !== null) ? $removed : $valid;
1073 }
1074
1075 $this->scheme_normalization();
1076 return true;
1077 }
1078
1079 /**
1080 * Set the iquery.
1081 *
1082 * @param string $iquery
1083 * @return bool
1084 */
1085 public function set_query($iquery)
1086 {
1087 if ($iquery === null)
1088 {
1089 $this->iquery = null;
1090 }
1091 else
1092 {
1093 $this->iquery = $this->replace_invalid_with_pct_encoding($iquery, '!$&\'()*+,;=:@/?', true);
1094 $this->scheme_normalization();
1095 }
1096 return true;
1097 }
1098
1099 /**
1100 * Set the ifragment.
1101 *
1102 * @param string $ifragment
1103 * @return bool
1104 */
1105 public function set_fragment($ifragment)
1106 {
1107 if ($ifragment === null)
1108 {
1109 $this->ifragment = null;
1110 }
1111 else
1112 {
1113 $this->ifragment = $this->replace_invalid_with_pct_encoding($ifragment, '!$&\'()*+,;=:@/?');
1114 $this->scheme_normalization();
1115 }
1116 return true;
1117 }
1118
1119 /**
1120 * Convert an IRI to a URI (or parts thereof)
1121 *
1122 * @return string
1123 */
1124 public function to_uri($string)
1125 {
1126 static $non_ascii;
1127 if (!$non_ascii)
1128 {
1129 $non_ascii = implode('', range("\x80", "\xFF"));
1130 }
1131
1132 $position = 0;
1133 $strlen = strlen($string);
1134 while (($position += strcspn($string, $non_ascii, $position)) < $strlen)
1135 {
1136 $string = substr_replace($string, sprintf('%%%02X', ord($string[$position])), $position, 1);
1137 $position += 3;
1138 $strlen += 2;
1139 }
1140
1141 return $string;
1142 }
1143
1144 /**
1145 * Get the complete IRI
1146 *
1147 * @return string
1148 */
1149 public function get_iri()
1150 {
1151 if (!$this->is_valid())
1152 {
1153 return false;
1154 }
1155
1156 $iri = '';
1157 if ($this->scheme !== null)
1158 {
1159 $iri .= $this->scheme . ':';
1160 }
1161 if (($iauthority = $this->get_iauthority()) !== null)
1162 {
1163 $iri .= '//' . $iauthority;
1164 }
1165 if ($this->ipath !== '')
1166 {
1167 $iri .= $this->ipath;
1168 }
1169 elseif (!empty($this->normalization[$this->scheme]['ipath']) && $iauthority !== null && $iauthority !== '')
1170 {
1171 $iri .= $this->normalization[$this->scheme]['ipath'];
1172 }
1173 if ($this->iquery !== null)
1174 {
1175 $iri .= '?' . $this->iquery;
1176 }
1177 if ($this->ifragment !== null)
1178 {
1179 $iri .= '#' . $this->ifragment;
1180 }
1181
1182 return $iri;
1183 }
1184
1185 /**
1186 * Get the complete URI
1187 *
1188 * @return string
1189 */
1190 public function get_uri()
1191 {
1192 return $this->to_uri($this->get_iri());
1193 }
1194
1195 /**
1196 * Get the complete iauthority
1197 *
1198 * @return string
1199 */
1200 protected function get_iauthority()
1201 {
1202 if ($this->iuserinfo !== null || $this->ihost !== null || $this->port !== null)
1203 {
1204 $iauthority = '';
1205 if ($this->iuserinfo !== null)
1206 {
1207 $iauthority .= $this->iuserinfo . '@';
1208 }
1209 if ($this->ihost !== null)
1210 {
1211 $iauthority .= $this->ihost;
1212 }
1213 if ($this->port !== null)
1214 {
1215 $iauthority .= ':' . $this->port;
1216 }
1217 return $iauthority;
1218 }
1219 else
1220 {
1221 return null;
1222 }
1223 }
1224
1225 /**
1226 * Get the complete authority
1227 *
1228 * @return string
1229 */
1230 protected function get_authority()
1231 {
1232 $iauthority = $this->get_iauthority();
1233 if (is_string($iauthority))
1234 return $this->to_uri($iauthority);
1235 else
1236 return $iauthority;
1237 }
1238 }
1239