xref: /dokuwiki/inc/common.php (revision 68491db90478be1b32bcb6f79572ee25753a079d) 
1<?php
2/**
3 * Common DokuWiki functions
4 *
5 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
6 * @author     Andreas Gohr <andi@splitbrain.org>
7 */
8
9use dokuwiki\Cache\CacheInstructions;
10use dokuwiki\Cache\CacheRenderer;
11use dokuwiki\ChangeLog\PageChangeLog;
12use dokuwiki\Subscriptions\PageSubscriptionSender;
13use dokuwiki\Subscriptions\SubscriberManager;
14use dokuwiki\Extension\AuthPlugin;
15use dokuwiki\Extension\Event;
16
17/**
18 * These constants are used with the recents function
19 */
20define('RECENTS_SKIP_DELETED', 2);
21define('RECENTS_SKIP_MINORS', 4);
22define('RECENTS_SKIP_SUBSPACES', 8);
23define('RECENTS_MEDIA_CHANGES', 16);
24define('RECENTS_MEDIA_PAGES_MIXED', 32);
25
26/**
27 * Wrapper around htmlspecialchars()
28 *
29 * @author Andreas Gohr <andi@splitbrain.org>
30 * @see    htmlspecialchars()
31 *
32 * @param string $string the string being converted
33 * @return string converted string
34 */
35function hsc($string) {
36    return htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
37}
38
39/**
40 * Checks if the given input is blank
41 *
42 * This is similar to empty() but will return false for "0".
43 *
44 * Please note: when you pass uninitialized variables, they will implicitly be created
45 * with a NULL value without warning.
46 *
47 * To avoid this it's recommended to guard the call with isset like this:
48 *
49 * (isset($foo) && !blank($foo))
50 * (!isset($foo) || blank($foo))
51 *
52 * @param $in
53 * @param bool $trim Consider a string of whitespace to be blank
54 * @return bool
55 */
56function blank(&$in, $trim = false) {
57    if(is_null($in)) return true;
58    if(is_array($in)) return empty($in);
59    if($in === "\0") return true;
60    if($trim && trim($in) === '') return true;
61    if(strlen($in) > 0) return false;
62    return empty($in);
63}
64
65/**
66 * print a newline terminated string
67 *
68 * You can give an indention as optional parameter
69 *
70 * @author Andreas Gohr <andi@splitbrain.org>
71 *
72 * @param string $string  line of text
73 * @param int    $indent  number of spaces indention
74 */
75function ptln($string, $indent = 0) {
76    echo str_repeat(' ', $indent)."$string\n";
77}
78
79/**
80 * strips control characters (<32) from the given string
81 *
82 * @author Andreas Gohr <andi@splitbrain.org>
83 *
84 * @param string $string being stripped
85 * @return string
86 */
87function stripctl($string) {
88    return preg_replace('/[\x00-\x1F]+/s', '', $string);
89}
90
91/**
92 * Return a secret token to be used for CSRF attack prevention
93 *
94 * @author  Andreas Gohr <andi@splitbrain.org>
95 * @link    http://en.wikipedia.org/wiki/Cross-site_request_forgery
96 * @link    http://christ1an.blogspot.com/2007/04/preventing-csrf-efficiently.html
97 *
98 * @return  string
99 */
100function getSecurityToken() {
101    /** @var Input $INPUT */
102    global $INPUT;
103
104    $user = $INPUT->server->str('REMOTE_USER');
105    $session = session_id();
106
107    // CSRF checks are only for logged in users - do not generate for anonymous
108    if(trim($user) == '' || trim($session) == '') return '';
109    return \dokuwiki\PassHash::hmac('md5', $session.$user, auth_cookiesalt());
110}
111
112/**
113 * Check the secret CSRF token
114 *
115 * @param null|string $token security token or null to read it from request variable
116 * @return bool success if the token matched
117 */
118function checkSecurityToken($token = null) {
119    /** @var Input $INPUT */
120    global $INPUT;
121    if(!$INPUT->server->str('REMOTE_USER')) return true; // no logged in user, no need for a check
122
123    if(is_null($token)) $token = $INPUT->str('sectok');
124    if(getSecurityToken() != $token) {
125        msg('Security Token did not match. Possible CSRF attack.', -1);
126        return false;
127    }
128    return true;
129}
130
131/**
132 * Print a hidden form field with a secret CSRF token
133 *
134 * @author  Andreas Gohr <andi@splitbrain.org>
135 *
136 * @param bool $print  if true print the field, otherwise html of the field is returned
137 * @return string html of hidden form field
138 */
139function formSecurityToken($print = true) {
140    $ret = '<div class="no"><input type="hidden" name="sectok" value="'.getSecurityToken().'" /></div>'."\n";
141    if($print) echo $ret;
142    return $ret;
143}
144
145/**
146 * Determine basic information for a request of $id
147 *
148 * @author Andreas Gohr <andi@splitbrain.org>
149 * @author Chris Smith <chris@jalakai.co.uk>
150 *
151 * @param string $id         pageid
152 * @param bool   $htmlClient add info about whether is mobile browser
153 * @return array with info for a request of $id
154 *
155 */
156function basicinfo($id, $htmlClient=true){
157    global $USERINFO;
158    /* @var Input $INPUT */
159    global $INPUT;
160
161    // set info about manager/admin status.
162    $info = array();
163    $info['isadmin']   = false;
164    $info['ismanager'] = false;
165    if($INPUT->server->has('REMOTE_USER')) {
166        $info['userinfo']   = $USERINFO;
167        $info['perm']       = auth_quickaclcheck($id);
168        $info['client']     = $INPUT->server->str('REMOTE_USER');
169
170        if($info['perm'] == AUTH_ADMIN) {
171            $info['isadmin']   = true;
172            $info['ismanager'] = true;
173        } elseif(auth_ismanager()) {
174            $info['ismanager'] = true;
175        }
176
177        // if some outside auth were used only REMOTE_USER is set
178        if(!$info['userinfo']['name']) {
179            $info['userinfo']['name'] = $INPUT->server->str('REMOTE_USER');
180        }
181
182    } else {
183        $info['perm']       = auth_aclcheck($id, '', null);
184        $info['client']     = clientIP(true);
185    }
186
187    $info['namespace'] = getNS($id);
188
189    // mobile detection
190    if ($htmlClient) {
191        $info['ismobile'] = clientismobile();
192    }
193
194    return $info;
195 }
196
197/**
198 * Return info about the current document as associative
199 * array.
200 *
201 * @author Andreas Gohr <andi@splitbrain.org>
202 *
203 * @return array with info about current document
204 */
205function pageinfo() {
206    global $ID;
207    global $REV;
208    global $RANGE;
209    global $lang;
210    /* @var Input $INPUT */
211    global $INPUT;
212
213    $info = basicinfo($ID);
214
215    // include ID & REV not redundant, as some parts of DokuWiki may temporarily change $ID, e.g. p_wiki_xhtml
216    // FIXME ... perhaps it would be better to ensure the temporary changes weren't necessary
217    $info['id']  = $ID;
218    $info['rev'] = $REV;
219
220    if($INPUT->server->has('REMOTE_USER')) {
221        $subManager = new SubscriberManager();
222        $info['subscribed'] = $subManager->userSubscription();
223    } else {
224        $info['subscribed'] = false;
225    }
226
227    $info['locked']     = checklock($ID);
228    $info['filepath']   = wikiFN($ID);
229    $info['exists']     = file_exists($info['filepath']);
230    $info['currentrev'] = @filemtime($info['filepath']);
231    if($REV) {
232        //check if current revision was meant
233        if($info['exists'] && ($info['currentrev'] == $REV)) {
234            $REV = '';
235        } elseif($RANGE) {
236            //section editing does not work with old revisions!
237            $REV   = '';
238            $RANGE = '';
239            msg($lang['nosecedit'], 0);
240        } else {
241            //really use old revision
242            $info['filepath'] = wikiFN($ID, $REV);
243            $info['exists']   = file_exists($info['filepath']);
244        }
245    }
246    $info['rev'] = $REV;
247    if($info['exists']) {
248        $info['writable'] = (is_writable($info['filepath']) &&
249            ($info['perm'] >= AUTH_EDIT));
250    } else {
251        $info['writable'] = ($info['perm'] >= AUTH_CREATE);
252    }
253    $info['editable'] = ($info['writable'] && empty($info['locked']));
254    $info['lastmod']  = @filemtime($info['filepath']);
255
256    //load page meta data
257    $info['meta'] = p_get_metadata($ID);
258
259    //who's the editor
260    $pagelog = new PageChangeLog($ID, 1024);
261    if($REV) {
262        $revinfo = $pagelog->getRevisionInfo($REV);
263    } else {
264        if(!empty($info['meta']['last_change']) && is_array($info['meta']['last_change'])) {
265            $revinfo = $info['meta']['last_change'];
266        } else {
267            $revinfo = $pagelog->getRevisionInfo($info['lastmod']);
268            // cache most recent changelog line in metadata if missing and still valid
269            if($revinfo !== false) {
270                $info['meta']['last_change'] = $revinfo;
271                p_set_metadata($ID, array('last_change' => $revinfo));
272            }
273        }
274    }
275    //and check for an external edit
276    if($revinfo !== false && $revinfo['date'] != $info['lastmod']) {
277        // cached changelog line no longer valid
278        $revinfo                     = false;
279        $info['meta']['last_change'] = $revinfo;
280        p_set_metadata($ID, array('last_change' => $revinfo));
281    }
282
283    if($revinfo !== false){
284        $info['ip']   = $revinfo['ip'];
285        $info['user'] = $revinfo['user'];
286        $info['sum']  = $revinfo['sum'];
287        // See also $INFO['meta']['last_change'] which is the most recent log line for page $ID.
288        // Use $INFO['meta']['last_change']['type']===DOKU_CHANGE_TYPE_MINOR_EDIT in place of $info['minor'].
289
290        if($revinfo['user']) {
291            $info['editor'] = $revinfo['user'];
292        } else {
293            $info['editor'] = $revinfo['ip'];
294        }
295    }else{
296        $info['ip']     = null;
297        $info['user']   = null;
298        $info['sum']    = null;
299        $info['editor'] = null;
300    }
301
302    // draft
303    $draft = new \dokuwiki\Draft($ID, $info['client']);
304    if ($draft->isDraftAvailable()) {
305        $info['draft'] = $draft->getDraftFilename();
306    }
307
308    return $info;
309}
310
311/**
312 * Initialize and/or fill global $JSINFO with some basic info to be given to javascript
313 */
314function jsinfo() {
315    global $JSINFO, $ID, $INFO, $ACT;
316
317    if (!is_array($JSINFO)) {
318        $JSINFO = [];
319    }
320    //export minimal info to JS, plugins can add more
321    $JSINFO['id']                    = $ID;
322    $JSINFO['namespace']             = isset($INFO) ? (string) $INFO['namespace'] : '';
323    $JSINFO['ACT']                   = act_clean($ACT);
324    $JSINFO['useHeadingNavigation']  = (int) useHeading('navigation');
325    $JSINFO['useHeadingContent']     = (int) useHeading('content');
326}
327
328/**
329 * Return information about the current media item as an associative array.
330 *
331 * @return array with info about current media item
332 */
333function mediainfo(){
334    global $NS;
335    global $IMG;
336
337    $info = basicinfo("$NS:*");
338    $info['image'] = $IMG;
339
340    return $info;
341}
342
343/**
344 * Build an string of URL parameters
345 *
346 * @author Andreas Gohr
347 *
348 * @param array  $params    array with key-value pairs
349 * @param string $sep       series of pairs are separated by this character
350 * @return string query string
351 */
352function buildURLparams($params, $sep = '&amp;') {
353    $url = '';
354    $amp = false;
355    foreach($params as $key => $val) {
356        if($amp) $url .= $sep;
357
358        $url .= rawurlencode($key).'=';
359        $url .= rawurlencode((string) $val);
360        $amp = true;
361    }
362    return $url;
363}
364
365/**
366 * Build an string of html tag attributes
367 *
368 * Skips keys starting with '_', values get HTML encoded
369 *
370 * @author Andreas Gohr
371 *
372 * @param array $params    array with (attribute name-attribute value) pairs
373 * @param bool  $skipempty skip empty string values?
374 * @return string
375 */
376function buildAttributes($params, $skipempty = false) {
377    $url   = '';
378    $white = false;
379    foreach($params as $key => $val) {
380        if($key[0] == '_') continue;
381        if($val === '' && $skipempty) continue;
382        if($white) $url .= ' ';
383
384        $url .= $key.'="';
385        $url .= htmlspecialchars($val);
386        $url .= '"';
387        $white = true;
388    }
389    return $url;
390}
391
392/**
393 * This builds the breadcrumb trail and returns it as array
394 *
395 * @author Andreas Gohr <andi@splitbrain.org>
396 *
397 * @return string[] with the data: array(pageid=>name, ... )
398 */
399function breadcrumbs() {
400    // we prepare the breadcrumbs early for quick session closing
401    static $crumbs = null;
402    if($crumbs != null) return $crumbs;
403
404    global $ID;
405    global $ACT;
406    global $conf;
407    global $INFO;
408
409    //first visit?
410    $crumbs = isset($_SESSION[DOKU_COOKIE]['bc']) ? $_SESSION[DOKU_COOKIE]['bc'] : array();
411    //we only save on show and existing visible readable wiki documents
412    $file = wikiFN($ID);
413    if($ACT != 'show' || $INFO['perm'] < AUTH_READ || isHiddenPage($ID) || !file_exists($file)) {
414        $_SESSION[DOKU_COOKIE]['bc'] = $crumbs;
415        return $crumbs;
416    }
417
418    // page names
419    $name = noNSorNS($ID);
420    if(useHeading('navigation')) {
421        // get page title
422        $title = p_get_first_heading($ID, METADATA_RENDER_USING_SIMPLE_CACHE);
423        if($title) {
424            $name = $title;
425        }
426    }
427
428    //remove ID from array
429    if(isset($crumbs[$ID])) {
430        unset($crumbs[$ID]);
431    }
432
433    //add to array
434    $crumbs[$ID] = $name;
435    //reduce size
436    while(count($crumbs) > $conf['breadcrumbs']) {
437        array_shift($crumbs);
438    }
439    //save to session
440    $_SESSION[DOKU_COOKIE]['bc'] = $crumbs;
441    return $crumbs;
442}
443
444/**
445 * Filter for page IDs
446 *
447 * This is run on a ID before it is outputted somewhere
448 * currently used to replace the colon with something else
449 * on Windows (non-IIS) systems and to have proper URL encoding
450 *
451 * See discussions at https://github.com/splitbrain/dokuwiki/pull/84 and
452 * https://github.com/splitbrain/dokuwiki/pull/173 why we use a whitelist of
453 * unaffected servers instead of blacklisting affected servers here.
454 *
455 * Urlencoding is ommitted when the second parameter is false
456 *
457 * @author Andreas Gohr <andi@splitbrain.org>
458 *
459 * @param string $id pageid being filtered
460 * @param bool   $ue apply urlencoding?
461 * @return string
462 */
463function idfilter($id, $ue = true) {
464    global $conf;
465    /* @var Input $INPUT */
466    global $INPUT;
467
468    if($conf['useslash'] && $conf['userewrite']) {
469        $id = strtr($id, ':', '/');
470    } elseif(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' &&
471        $conf['userewrite'] &&
472        strpos($INPUT->server->str('SERVER_SOFTWARE'), 'Microsoft-IIS') === false
473    ) {
474        $id = strtr($id, ':', ';');
475    }
476    if($ue) {
477        $id = rawurlencode($id);
478        $id = str_replace('%3A', ':', $id); //keep as colon
479        $id = str_replace('%3B', ';', $id); //keep as semicolon
480        $id = str_replace('%2F', '/', $id); //keep as slash
481    }
482    return $id;
483}
484
485/**
486 * This builds a link to a wikipage
487 *
488 * It handles URL rewriting and adds additional parameters
489 *
490 * @author Andreas Gohr <andi@splitbrain.org>
491 *
492 * @param string       $id             page id, defaults to start page
493 * @param string|array $urlParameters  URL parameters, associative array recommended
494 * @param bool         $absolute       request an absolute URL instead of relative
495 * @param string       $separator      parameter separator
496 * @return string
497 */
498function wl($id = '', $urlParameters = '', $absolute = false, $separator = '&amp;') {
499    global $conf;
500    if(is_array($urlParameters)) {
501        if(isset($urlParameters['rev']) && !$urlParameters['rev']) unset($urlParameters['rev']);
502        if(isset($urlParameters['at']) && $conf['date_at_format']) {
503            $urlParameters['at'] = date($conf['date_at_format'], $urlParameters['at']);
504        }
505        $urlParameters = buildURLparams($urlParameters, $separator);
506    } else {
507        $urlParameters = str_replace(',', $separator, $urlParameters);
508    }
509    if($id === '') {
510        $id = $conf['start'];
511    }
512    $id = idfilter($id);
513    if($absolute) {
514        $xlink = DOKU_URL;
515    } else {
516        $xlink = DOKU_BASE;
517    }
518
519    if($conf['userewrite'] == 2) {
520        $xlink .= DOKU_SCRIPT.'/'.$id;
521        if($urlParameters) $xlink .= '?'.$urlParameters;
522    } elseif($conf['userewrite']) {
523        $xlink .= $id;
524        if($urlParameters) $xlink .= '?'.$urlParameters;
525    } elseif($id !== '') {
526        $xlink .= DOKU_SCRIPT.'?id='.$id;
527        if($urlParameters) $xlink .= $separator.$urlParameters;
528    } else {
529        $xlink .= DOKU_SCRIPT;
530        if($urlParameters) $xlink .= '?'.$urlParameters;
531    }
532
533    return $xlink;
534}
535
536/**
537 * This builds a link to an alternate page format
538 *
539 * Handles URL rewriting if enabled. Follows the style of wl().
540 *
541 * @author Ben Coburn <btcoburn@silicodon.net>
542 * @param string       $id             page id, defaults to start page
543 * @param string       $format         the export renderer to use
544 * @param string|array $urlParameters  URL parameters, associative array recommended
545 * @param bool         $abs            request an absolute URL instead of relative
546 * @param string       $sep            parameter separator
547 * @return string
548 */
549function exportlink($id = '', $format = 'raw', $urlParameters = '', $abs = false, $sep = '&amp;') {
550    global $conf;
551    if(is_array($urlParameters)) {
552        $urlParameters = buildURLparams($urlParameters, $sep);
553    } else {
554        $urlParameters = str_replace(',', $sep, $urlParameters);
555    }
556
557    $format = rawurlencode($format);
558    $id     = idfilter($id);
559    if($abs) {
560        $xlink = DOKU_URL;
561    } else {
562        $xlink = DOKU_BASE;
563    }
564
565    if($conf['userewrite'] == 2) {
566        $xlink .= DOKU_SCRIPT.'/'.$id.'?do=export_'.$format;
567        if($urlParameters) $xlink .= $sep.$urlParameters;
568    } elseif($conf['userewrite'] == 1) {
569        $xlink .= '_export/'.$format.'/'.$id;
570        if($urlParameters) $xlink .= '?'.$urlParameters;
571    } else {
572        $xlink .= DOKU_SCRIPT.'?do=export_'.$format.$sep.'id='.$id;
573        if($urlParameters) $xlink .= $sep.$urlParameters;
574    }
575
576    return $xlink;
577}
578
579/**
580 * Build a link to a media file
581 *
582 * Will return a link to the detail page if $direct is false
583 *
584 * The $more parameter should always be given as array, the function then
585 * will strip default parameters to produce even cleaner URLs
586 *
587 * @param string  $id     the media file id or URL
588 * @param mixed   $more   string or array with additional parameters
589 * @param bool    $direct link to detail page if false
590 * @param string  $sep    URL parameter separator
591 * @param bool    $abs    Create an absolute URL
592 * @return string
593 */
594function ml($id = '', $more = '', $direct = true, $sep = '&amp;', $abs = false) {
595    global $conf;
596    $isexternalimage = media_isexternal($id);
597    if(!$isexternalimage) {
598        $id = cleanID($id);
599    }
600
601    if(is_array($more)) {
602        // add token for resized images
603        if(!empty($more['w']) || !empty($more['h']) || $isexternalimage){
604            $more['tok'] = media_get_token($id,$more['w'],$more['h']);
605        }
606        // strip defaults for shorter URLs
607        if(isset($more['cache']) && $more['cache'] == 'cache') unset($more['cache']);
608        if(empty($more['w'])) unset($more['w']);
609        if(empty($more['h'])) unset($more['h']);
610        if(isset($more['id']) && $direct) unset($more['id']);
611        if(isset($more['rev']) && !$more['rev']) unset($more['rev']);
612        $more = buildURLparams($more, $sep);
613    } else {
614        $matches = array();
615        if (preg_match_all('/\b(w|h)=(\d*)\b/',$more,$matches,PREG_SET_ORDER) || $isexternalimage){
616            $resize = array('w'=>0, 'h'=>0);
617            foreach ($matches as $match){
618                $resize[$match[1]] = $match[2];
619            }
620            $more .= $more === '' ? '' : $sep;
621            $more .= 'tok='.media_get_token($id,$resize['w'],$resize['h']);
622        }
623        $more = str_replace('cache=cache', '', $more); //skip default
624        $more = str_replace(',,', ',', $more);
625        $more = str_replace(',', $sep, $more);
626    }
627
628    if($abs) {
629        $xlink = DOKU_URL;
630    } else {
631        $xlink = DOKU_BASE;
632    }
633
634    // external URLs are always direct without rewriting
635    if($isexternalimage) {
636        $xlink .= 'lib/exe/fetch.php';
637        $xlink .= '?'.$more;
638        $xlink .= $sep.'media='.rawurlencode($id);
639        return $xlink;
640    }
641
642    $id = idfilter($id);
643
644    // decide on scriptname
645    if($direct) {
646        if($conf['userewrite'] == 1) {
647            $script = '_media';
648        } else {
649            $script = 'lib/exe/fetch.php';
650        }
651    } else {
652        if($conf['userewrite'] == 1) {
653            $script = '_detail';
654        } else {
655            $script = 'lib/exe/detail.php';
656        }
657    }
658
659    // build URL based on rewrite mode
660    if($conf['userewrite']) {
661        $xlink .= $script.'/'.$id;
662        if($more) $xlink .= '?'.$more;
663    } else {
664        if($more) {
665            $xlink .= $script.'?'.$more;
666            $xlink .= $sep.'media='.$id;
667        } else {
668            $xlink .= $script.'?media='.$id;
669        }
670    }
671
672    return $xlink;
673}
674
675/**
676 * Returns the URL to the DokuWiki base script
677 *
678 * Consider using wl() instead, unless you absoutely need the doku.php endpoint
679 *
680 * @author Andreas Gohr <andi@splitbrain.org>
681 *
682 * @return string
683 */
684function script() {
685    return DOKU_BASE.DOKU_SCRIPT;
686}
687
688/**
689 * Spamcheck against wordlist
690 *
691 * Checks the wikitext against a list of blocked expressions
692 * returns true if the text contains any bad words
693 *
694 * Triggers COMMON_WORDBLOCK_BLOCKED
695 *
696 *  Action Plugins can use this event to inspect the blocked data
697 *  and gain information about the user who was blocked.
698 *
699 *  Event data:
700 *    data['matches']  - array of matches
701 *    data['userinfo'] - information about the blocked user
702 *      [ip]           - ip address
703 *      [user]         - username (if logged in)
704 *      [mail]         - mail address (if logged in)
705 *      [name]         - real name (if logged in)
706 *
707 * @author Andreas Gohr <andi@splitbrain.org>
708 * @author Michael Klier <chi@chimeric.de>
709 *
710 * @param  string $text - optional text to check, if not given the globals are used
711 * @return bool         - true if a spam word was found
712 */
713function checkwordblock($text = '') {
714    global $TEXT;
715    global $PRE;
716    global $SUF;
717    global $SUM;
718    global $conf;
719    global $INFO;
720    /* @var Input $INPUT */
721    global $INPUT;
722
723    if(!$conf['usewordblock']) return false;
724
725    if(!$text) $text = "$PRE $TEXT $SUF $SUM";
726
727    // we prepare the text a tiny bit to prevent spammers circumventing URL checks
728    // phpcs:disable Generic.Files.LineLength.TooLong
729    $text = preg_replace(
730        '!(\b)(www\.[\w.:?\-;,]+?\.[\w.:?\-;,]+?[\w/\#~:.?+=&%@\!\-.:?\-;,]+?)([.:?\-;,]*[^\w/\#~:.?+=&%@\!\-.:?\-;,])!i',
731        '\1http://\2 \2\3',
732        $text
733    );
734    // phpcs:enable
735
736    $wordblocks = getWordblocks();
737    // how many lines to read at once (to work around some PCRE limits)
738    if(version_compare(phpversion(), '4.3.0', '<')) {
739        // old versions of PCRE define a maximum of parenthesises even if no
740        // backreferences are used - the maximum is 99
741        // this is very bad performancewise and may even be too high still
742        $chunksize = 40;
743    } else {
744        // read file in chunks of 200 - this should work around the
745        // MAX_PATTERN_SIZE in modern PCRE
746        $chunksize = 200;
747    }
748    while($blocks = array_splice($wordblocks, 0, $chunksize)) {
749        $re = array();
750        // build regexp from blocks
751        foreach($blocks as $block) {
752            $block = preg_replace('/#.*$/', '', $block);
753            $block = trim($block);
754            if(empty($block)) continue;
755            $re[] = $block;
756        }
757        if(count($re) && preg_match('#('.join('|', $re).')#si', $text, $matches)) {
758            // prepare event data
759            $data = array();
760            $data['matches']        = $matches;
761            $data['userinfo']['ip'] = $INPUT->server->str('REMOTE_ADDR');
762            if($INPUT->server->str('REMOTE_USER')) {
763                $data['userinfo']['user'] = $INPUT->server->str('REMOTE_USER');
764                $data['userinfo']['name'] = $INFO['userinfo']['name'];
765                $data['userinfo']['mail'] = $INFO['userinfo']['mail'];
766            }
767            $callback = function () {
768                return true;
769            };
770            return Event::createAndTrigger('COMMON_WORDBLOCK_BLOCKED', $data, $callback, true);
771        }
772    }
773    return false;
774}
775
776/**
777 * Return the IP of the client
778 *
779 * Honours X-Forwarded-For and X-Real-IP Proxy Headers
780 *
781 * It returns a comma separated list of IPs if the above mentioned
782 * headers are set. If the single parameter is set, it tries to return
783 * a routable public address, prefering the ones suplied in the X
784 * headers
785 *
786 * @author Andreas Gohr <andi@splitbrain.org>
787 *
788 * @param  boolean $single If set only a single IP is returned
789 * @return string
790 */
791function clientIP($single = false) {
792    /* @var Input $INPUT */
793    global $INPUT, $conf;
794
795    $ip   = array();
796    $ip[] = $INPUT->server->str('REMOTE_ADDR');
797    if($INPUT->server->str('HTTP_X_FORWARDED_FOR')) {
798        $ip = array_merge($ip, explode(',', str_replace(' ', '', $INPUT->server->str('HTTP_X_FORWARDED_FOR'))));
799    }
800    if($INPUT->server->str('HTTP_X_REAL_IP')) {
801        $ip = array_merge($ip, explode(',', str_replace(' ', '', $INPUT->server->str('HTTP_X_REAL_IP'))));
802    }
803
804    // some IPv4/v6 regexps borrowed from Feyd
805    // see: http://forums.devnetwork.net/viewtopic.php?f=38&t=53479
806    $dec_octet   = '(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[0-9])';
807    $hex_digit   = '[A-Fa-f0-9]';
808    $h16         = "{$hex_digit}{1,4}";
809    $IPv4Address = "$dec_octet\\.$dec_octet\\.$dec_octet\\.$dec_octet";
810    $ls32        = "(?:$h16:$h16|$IPv4Address)";
811    $IPv6Address =
812        "(?:(?:{$IPv4Address})|(?:".
813            "(?:$h16:){6}$ls32".
814            "|::(?:$h16:){5}$ls32".
815            "|(?:$h16)?::(?:$h16:){4}$ls32".
816            "|(?:(?:$h16:){0,1}$h16)?::(?:$h16:){3}$ls32".
817            "|(?:(?:$h16:){0,2}$h16)?::(?:$h16:){2}$ls32".
818            "|(?:(?:$h16:){0,3}$h16)?::(?:$h16:){1}$ls32".
819            "|(?:(?:$h16:){0,4}$h16)?::$ls32".
820            "|(?:(?:$h16:){0,5}$h16)?::$h16".
821            "|(?:(?:$h16:){0,6}$h16)?::".
822            ")(?:\\/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))?)";
823
824    // remove any non-IP stuff
825    $cnt   = count($ip);
826    $match = array();
827    for($i = 0; $i < $cnt; $i++) {
828        if(preg_match("/^$IPv4Address$/", $ip[$i], $match) || preg_match("/^$IPv6Address$/", $ip[$i], $match)) {
829            $ip[$i] = $match[0];
830        } else {
831            $ip[$i] = '';
832        }
833        if(empty($ip[$i])) unset($ip[$i]);
834    }
835    $ip = array_values(array_unique($ip));
836    if(!$ip[0]) $ip[0] = '0.0.0.0'; // for some strange reason we don't have a IP
837
838    if(!$single) return join(',', $ip);
839
840    // skip trusted local addresses
841    foreach($ip as $i) {
842        if(!empty($conf['trustedproxy']) && preg_match('/'.$conf['trustedproxy'].'/', $i)) {
843            continue;
844        } else {
845            return $i;
846        }
847    }
848
849    // still here? just use the last address
850    // this case all ips in the list are trusted
851    return $ip[count($ip)-1];
852}
853
854/**
855 * Check if the browser is on a mobile device
856 *
857 * Adapted from the example code at url below
858 *
859 * @link http://www.brainhandles.com/2007/10/15/detecting-mobile-browsers/#code
860 *
861 * @deprecated 2018-04-27 you probably want media queries instead anyway
862 * @return bool if true, client is mobile browser; otherwise false
863 */
864function clientismobile() {
865    /* @var Input $INPUT */
866    global $INPUT;
867
868    if($INPUT->server->has('HTTP_X_WAP_PROFILE')) return true;
869
870    if(preg_match('/wap\.|\.wap/i', $INPUT->server->str('HTTP_ACCEPT'))) return true;
871
872    if(!$INPUT->server->has('HTTP_USER_AGENT')) return false;
873
874    $uamatches = join(
875        '|',
876        [
877            'midp', 'j2me', 'avantg', 'docomo', 'novarra', 'palmos', 'palmsource', '240x320', 'opwv',
878            'chtml', 'pda', 'windows ce', 'mmp\/', 'blackberry', 'mib\/', 'symbian', 'wireless', 'nokia',
879            'hand', 'mobi', 'phone', 'cdm', 'up\.b', 'audio', 'SIE\-', 'SEC\-', 'samsung', 'HTC', 'mot\-',
880            'mitsu', 'sagem', 'sony', 'alcatel', 'lg', 'erics', 'vx', 'NEC', 'philips', 'mmm', 'xx',
881            'panasonic', 'sharp', 'wap', 'sch', 'rover', 'pocket', 'benq', 'java', 'pt', 'pg', 'vox',
882            'amoi', 'bird', 'compal', 'kg', 'voda', 'sany', 'kdd', 'dbt', 'sendo', 'sgh', 'gradi', 'jb',
883            '\d\d\di', 'moto'
884        ]
885    );
886
887    if(preg_match("/$uamatches/i", $INPUT->server->str('HTTP_USER_AGENT'))) return true;
888
889    return false;
890}
891
892/**
893 * check if a given link is interwiki link
894 *
895 * @param string $link the link, e.g. "wiki>page"
896 * @return bool
897 */
898function link_isinterwiki($link){
899    if (preg_match('/^[a-zA-Z0-9\.]+>/u',$link)) return true;
900    return false;
901}
902
903/**
904 * Convert one or more comma separated IPs to hostnames
905 *
906 * If $conf['dnslookups'] is disabled it simply returns the input string
907 *
908 * @author Glen Harris <astfgl@iamnota.org>
909 *
910 * @param  string $ips comma separated list of IP addresses
911 * @return string a comma separated list of hostnames
912 */
913function gethostsbyaddrs($ips) {
914    global $conf;
915    if(!$conf['dnslookups']) return $ips;
916
917    $hosts = array();
918    $ips   = explode(',', $ips);
919
920    if(is_array($ips)) {
921        foreach($ips as $ip) {
922            $hosts[] = gethostbyaddr(trim($ip));
923        }
924        return join(',', $hosts);
925    } else {
926        return gethostbyaddr(trim($ips));
927    }
928}
929
930/**
931 * Checks if a given page is currently locked.
932 *
933 * removes stale lockfiles
934 *
935 * @author Andreas Gohr <andi@splitbrain.org>
936 *
937 * @param string $id page id
938 * @return bool page is locked?
939 */
940function checklock($id) {
941    global $conf;
942    /* @var Input $INPUT */
943    global $INPUT;
944
945    $lock = wikiLockFN($id);
946
947    //no lockfile
948    if(!file_exists($lock)) return false;
949
950    //lockfile expired
951    if((time() - filemtime($lock)) > $conf['locktime']) {
952        @unlink($lock);
953        return false;
954    }
955
956    //my own lock
957    @list($ip, $session) = explode("\n", io_readFile($lock));
958    if($ip == $INPUT->server->str('REMOTE_USER') || $ip == clientIP() || (session_id() && $session == session_id())) {
959        return false;
960    }
961
962    return $ip;
963}
964
965/**
966 * Lock a page for editing
967 *
968 * @author Andreas Gohr <andi@splitbrain.org>
969 *
970 * @param string $id page id to lock
971 */
972function lock($id) {
973    global $conf;
974    /* @var Input $INPUT */
975    global $INPUT;
976
977    if($conf['locktime'] == 0) {
978        return;
979    }
980
981    $lock = wikiLockFN($id);
982    if($INPUT->server->str('REMOTE_USER')) {
983        io_saveFile($lock, $INPUT->server->str('REMOTE_USER'));
984    } else {
985        io_saveFile($lock, clientIP()."\n".session_id());
986    }
987}
988
989/**
990 * Unlock a page if it was locked by the user
991 *
992 * @author Andreas Gohr <andi@splitbrain.org>
993 *
994 * @param string $id page id to unlock
995 * @return bool true if a lock was removed
996 */
997function unlock($id) {
998    /* @var Input $INPUT */
999    global $INPUT;
1000
1001    $lock = wikiLockFN($id);
1002    if(file_exists($lock)) {
1003        @list($ip, $session) = explode("\n", io_readFile($lock));
1004        if($ip == $INPUT->server->str('REMOTE_USER') || $ip == clientIP() || $session == session_id()) {
1005            @unlink($lock);
1006            return true;
1007        }
1008    }
1009    return false;
1010}
1011
1012/**
1013 * convert line ending to unix format
1014 *
1015 * also makes sure the given text is valid UTF-8
1016 *
1017 * @see    formText() for 2crlf conversion
1018 * @author Andreas Gohr <andi@splitbrain.org>
1019 *
1020 * @param string $text
1021 * @return string
1022 */
1023function cleanText($text) {
1024    $text = preg_replace("/(\015\012)|(\015)/", "\012", $text);
1025
1026    // if the text is not valid UTF-8 we simply assume latin1
1027    // this won't break any worse than it breaks with the wrong encoding
1028    // but might actually fix the problem in many cases
1029    if(!\dokuwiki\Utf8\Clean::isUtf8($text)) $text = utf8_encode($text);
1030
1031    return $text;
1032}
1033
1034/**
1035 * Prepares text for print in Webforms by encoding special chars.
1036 * It also converts line endings to Windows format which is
1037 * pseudo standard for webforms.
1038 *
1039 * @see    cleanText() for 2unix conversion
1040 * @author Andreas Gohr <andi@splitbrain.org>
1041 *
1042 * @param string $text
1043 * @return string
1044 */
1045function formText($text) {
1046    $text = str_replace("\012", "\015\012", $text);
1047    return htmlspecialchars($text);
1048}
1049
1050/**
1051 * Returns the specified local text in raw format
1052 *
1053 * @author Andreas Gohr <andi@splitbrain.org>
1054 *
1055 * @param string $id   page id
1056 * @param string $ext  extension of file being read, default 'txt'
1057 * @return string
1058 */
1059function rawLocale($id, $ext = 'txt') {
1060    return io_readFile(localeFN($id, $ext));
1061}
1062
1063/**
1064 * Returns the raw WikiText
1065 *
1066 * @author Andreas Gohr <andi@splitbrain.org>
1067 *
1068 * @param string $id   page id
1069 * @param string|int $rev  timestamp when a revision of wikitext is desired
1070 * @return string
1071 */
1072function rawWiki($id, $rev = '') {
1073    return io_readWikiPage(wikiFN($id, $rev), $id, $rev);
1074}
1075
1076/**
1077 * Returns the pagetemplate contents for the ID's namespace
1078 *
1079 * @triggers COMMON_PAGETPL_LOAD
1080 * @author Andreas Gohr <andi@splitbrain.org>
1081 *
1082 * @param string $id the id of the page to be created
1083 * @return string parsed pagetemplate content
1084 */
1085function pageTemplate($id) {
1086    global $conf;
1087
1088    if(is_array($id)) $id = $id[0];
1089
1090    // prepare initial event data
1091    $data = array(
1092        'id'        => $id, // the id of the page to be created
1093        'tpl'       => '', // the text used as template
1094        'tplfile'   => '', // the file above text was/should be loaded from
1095        'doreplace' => true // should wildcard replacements be done on the text?
1096    );
1097
1098    $evt = new Event('COMMON_PAGETPL_LOAD', $data);
1099    if($evt->advise_before(true)) {
1100        // the before event might have loaded the content already
1101        if(empty($data['tpl'])) {
1102            // if the before event did not set a template file, try to find one
1103            if(empty($data['tplfile'])) {
1104                $path = dirname(wikiFN($id));
1105                if(file_exists($path.'/_template.txt')) {
1106                    $data['tplfile'] = $path.'/_template.txt';
1107                } else {
1108                    // search upper namespaces for templates
1109                    $len = strlen(rtrim($conf['datadir'], '/'));
1110                    while(strlen($path) >= $len) {
1111                        if(file_exists($path.'/__template.txt')) {
1112                            $data['tplfile'] = $path.'/__template.txt';
1113                            break;
1114                        }
1115                        $path = substr($path, 0, strrpos($path, '/'));
1116                    }
1117                }
1118            }
1119            // load the content
1120            $data['tpl'] = io_readFile($data['tplfile']);
1121        }
1122        if($data['doreplace']) parsePageTemplate($data);
1123    }
1124    $evt->advise_after();
1125    unset($evt);
1126
1127    return $data['tpl'];
1128}
1129
1130/**
1131 * Performs common page template replacements
1132 * This works on data from COMMON_PAGETPL_LOAD
1133 *
1134 * @author Andreas Gohr <andi@splitbrain.org>
1135 *
1136 * @param array $data array with event data
1137 * @return string
1138 */
1139function parsePageTemplate(&$data) {
1140    /**
1141     * @var string $id        the id of the page to be created
1142     * @var string $tpl       the text used as template
1143     * @var string $tplfile   the file above text was/should be loaded from
1144     * @var bool   $doreplace should wildcard replacements be done on the text?
1145     */
1146    extract($data);
1147
1148    global $USERINFO;
1149    global $conf;
1150    /* @var Input $INPUT */
1151    global $INPUT;
1152
1153    // replace placeholders
1154    $file = noNS($id);
1155    $page = strtr($file, $conf['sepchar'], ' ');
1156
1157    $tpl = str_replace(
1158        array(
1159             '@ID@',
1160             '@NS@',
1161             '@CURNS@',
1162             '@!CURNS@',
1163             '@!!CURNS@',
1164             '@!CURNS!@',
1165             '@FILE@',
1166             '@!FILE@',
1167             '@!FILE!@',
1168             '@PAGE@',
1169             '@!PAGE@',
1170             '@!!PAGE@',
1171             '@!PAGE!@',
1172             '@USER@',
1173             '@NAME@',
1174             '@MAIL@',
1175             '@DATE@',
1176        ),
1177        array(
1178             $id,
1179             getNS($id),
1180             curNS($id),
1181             utf8_ucfirst(curNS($id)),
1182             utf8_ucwords(curNS($id)),
1183             utf8_strtoupper(curNS($id)),
1184             $file,
1185             \dokuwiki\Utf8\PhpString::ucfirst($file),
1186             \dokuwiki\Utf8\PhpString::strtoupper($file),
1187             $page,
1188             \dokuwiki\Utf8\PhpString::ucfirst($page),
1189             \dokuwiki\Utf8\PhpString::ucwords($page),
1190             \dokuwiki\Utf8\PhpString::strtoupper($page),
1191             $INPUT->server->str('REMOTE_USER'),
1192             $USERINFO ? $USERINFO['name'] : '',
1193             $USERINFO ? $USERINFO['mail'] : '',
1194             $conf['dformat'],
1195        ), $tpl
1196    );
1197
1198    // we need the callback to work around strftime's char limit
1199    $tpl = preg_replace_callback(
1200        '/%./',
1201        function ($m) {
1202            return strftime($m[0]);
1203        },
1204        $tpl
1205    );
1206    $data['tpl'] = $tpl;
1207    return $tpl;
1208}
1209
1210/**
1211 * Returns the raw Wiki Text in three slices.
1212 *
1213 * The range parameter needs to have the form "from-to"
1214 * and gives the range of the section in bytes - no
1215 * UTF-8 awareness is needed.
1216 * The returned order is prefix, section and suffix.
1217 *
1218 * @author Andreas Gohr <andi@splitbrain.org>
1219 *
1220 * @param string $range in form "from-to"
1221 * @param string $id    page id
1222 * @param string $rev   optional, the revision timestamp
1223 * @return string[] with three slices
1224 */
1225function rawWikiSlices($range, $id, $rev = '') {
1226    $text = io_readWikiPage(wikiFN($id, $rev), $id, $rev);
1227
1228    // Parse range
1229    list($from, $to) = explode('-', $range, 2);
1230    // Make range zero-based, use defaults if marker is missing
1231    $from = !$from ? 0 : ($from - 1);
1232    $to   = !$to ? strlen($text) : ($to - 1);
1233
1234    $slices = array();
1235    $slices[0] = substr($text, 0, $from);
1236    $slices[1] = substr($text, $from, $to - $from);
1237    $slices[2] = substr($text, $to);
1238    return $slices;
1239}
1240
1241/**
1242 * Joins wiki text slices
1243 *
1244 * function to join the text slices.
1245 * When the pretty parameter is set to true it adds additional empty
1246 * lines between sections if needed (used on saving).
1247 *
1248 * @author Andreas Gohr <andi@splitbrain.org>
1249 *
1250 * @param string $pre   prefix
1251 * @param string $text  text in the middle
1252 * @param string $suf   suffix
1253 * @param bool $pretty add additional empty lines between sections
1254 * @return string
1255 */
1256function con($pre, $text, $suf, $pretty = false) {
1257    if($pretty) {
1258        if($pre !== '' && substr($pre, -1) !== "\n" &&
1259            substr($text, 0, 1) !== "\n"
1260        ) {
1261            $pre .= "\n";
1262        }
1263        if($suf !== '' && substr($text, -1) !== "\n" &&
1264            substr($suf, 0, 1) !== "\n"
1265        ) {
1266            $text .= "\n";
1267        }
1268    }
1269
1270    return $pre.$text.$suf;
1271}
1272
1273/**
1274 * Checks if the current page version is newer than the last entry in the page's
1275 * changelog. If so, we assume it has been an external edit and we create an
1276 * attic copy and add a proper changelog line.
1277 *
1278 * This check is only executed when the page is about to be saved again from the
1279 * wiki, triggered in @see saveWikiText()
1280 *
1281 * @param string $id the page ID
1282 */
1283function detectExternalEdit($id) {
1284    global $lang;
1285
1286    $fileLastMod = wikiFN($id);
1287    $lastMod     = @filemtime($fileLastMod); // from page
1288    $pagelog     = new PageChangeLog($id, 1024);
1289    $lastRev     = $pagelog->getRevisions(-1, 1); // from changelog
1290    $lastRev     = (int) (empty($lastRev) ? 0 : $lastRev[0]);
1291
1292    if(!file_exists(wikiFN($id, $lastMod)) && file_exists($fileLastMod) && $lastMod >= $lastRev) {
1293        // add old revision to the attic if missing
1294        saveOldRevision($id);
1295        // add a changelog entry if this edit came from outside dokuwiki
1296        if($lastMod > $lastRev) {
1297            $fileLastRev = wikiFN($id, $lastRev);
1298            $revinfo = $pagelog->getRevisionInfo($lastRev);
1299            if(empty($lastRev) || !file_exists($fileLastRev) || $revinfo['type'] == DOKU_CHANGE_TYPE_DELETE) {
1300                $filesize_old = 0;
1301            } else {
1302                $filesize_old = io_getSizeFile($fileLastRev);
1303            }
1304            $filesize_new = filesize($fileLastMod);
1305            $sizechange = $filesize_new - $filesize_old;
1306
1307            addLogEntry(
1308                $lastMod,
1309                $id,
1310                DOKU_CHANGE_TYPE_EDIT,
1311                $lang['external_edit'],
1312                '',
1313                array('ExternalEdit' => true),
1314                $sizechange
1315            );
1316            // remove soon to be stale instructions
1317            $cache = new CacheInstructions($id, $fileLastMod);
1318            $cache->removeCache();
1319        }
1320    }
1321}
1322
1323/**
1324 * Saves a wikitext by calling io_writeWikiPage.
1325 * Also directs changelog and attic updates.
1326 *
1327 * @author Andreas Gohr <andi@splitbrain.org>
1328 * @author Ben Coburn <btcoburn@silicodon.net>
1329 *
1330 * @param string $id       page id
1331 * @param string $text     wikitext being saved
1332 * @param string $summary  summary of text update
1333 * @param bool   $minor    mark this saved version as minor update
1334 */
1335function saveWikiText($id, $text, $summary, $minor = false) {
1336    /* Note to developers:
1337       This code is subtle and delicate. Test the behavior of
1338       the attic and changelog with dokuwiki and external edits
1339       after any changes. External edits change the wiki page
1340       directly without using php or dokuwiki.
1341     */
1342    global $conf;
1343    global $lang;
1344    global $REV;
1345    /* @var Input $INPUT */
1346    global $INPUT;
1347
1348    // prepare data for event
1349    $svdta = array();
1350    $svdta['id']             = $id;
1351    $svdta['file']           = wikiFN($id);
1352    $svdta['revertFrom']     = $REV;
1353    $svdta['oldRevision']    = @filemtime($svdta['file']);
1354    $svdta['newRevision']    = 0;
1355    $svdta['newContent']     = $text;
1356    $svdta['oldContent']     = rawWiki($id);
1357    $svdta['summary']        = $summary;
1358    $svdta['contentChanged'] = ($svdta['newContent'] != $svdta['oldContent']);
1359    $svdta['changeInfo']     = '';
1360    $svdta['changeType']     = DOKU_CHANGE_TYPE_EDIT;
1361    $svdta['sizechange']     = null;
1362
1363    // select changelog line type
1364    if($REV) {
1365        $svdta['changeType']  = DOKU_CHANGE_TYPE_REVERT;
1366        $svdta['changeInfo'] = $REV;
1367    } else if(!file_exists($svdta['file'])) {
1368        $svdta['changeType'] = DOKU_CHANGE_TYPE_CREATE;
1369    } else if(trim($text) == '') {
1370        // empty or whitespace only content deletes
1371        $svdta['changeType'] = DOKU_CHANGE_TYPE_DELETE;
1372        // autoset summary on deletion
1373        if(blank($svdta['summary'])) {
1374            $svdta['summary'] = $lang['deleted'];
1375        }
1376    } else if($minor && $conf['useacl'] && $INPUT->server->str('REMOTE_USER')) {
1377        //minor edits only for logged in users
1378        $svdta['changeType'] = DOKU_CHANGE_TYPE_MINOR_EDIT;
1379    }
1380
1381    $event = new Event('COMMON_WIKIPAGE_SAVE', $svdta);
1382    if(!$event->advise_before()) return;
1383
1384    // if the content has not been changed, no save happens (plugins may override this)
1385    if(!$svdta['contentChanged']) return;
1386
1387    detectExternalEdit($id);
1388
1389    if(
1390        $svdta['changeType'] == DOKU_CHANGE_TYPE_CREATE ||
1391        ($svdta['changeType'] == DOKU_CHANGE_TYPE_REVERT && !file_exists($svdta['file']))
1392    ) {
1393        $filesize_old = 0;
1394    } else {
1395        $filesize_old = filesize($svdta['file']);
1396    }
1397    if($svdta['changeType'] == DOKU_CHANGE_TYPE_DELETE) {
1398        // Send "update" event with empty data, so plugins can react to page deletion
1399        $data = array(array($svdta['file'], '', false), getNS($id), noNS($id), false);
1400        Event::createAndTrigger('IO_WIKIPAGE_WRITE', $data);
1401        // pre-save deleted revision
1402        @touch($svdta['file']);
1403        clearstatcache();
1404        $svdta['newRevision'] = saveOldRevision($id);
1405        // remove empty file
1406        @unlink($svdta['file']);
1407        $filesize_new = 0;
1408        // don't remove old meta info as it should be saved, plugins can use
1409        // IO_WIKIPAGE_WRITE for removing their metadata...
1410        // purge non-persistant meta data
1411        p_purge_metadata($id);
1412        // remove empty namespaces
1413        io_sweepNS($id, 'datadir');
1414        io_sweepNS($id, 'mediadir');
1415    } else {
1416        // save file (namespace dir is created in io_writeWikiPage)
1417        io_writeWikiPage($svdta['file'], $svdta['newContent'], $id);
1418        // pre-save the revision, to keep the attic in sync
1419        $svdta['newRevision'] = saveOldRevision($id);
1420        $filesize_new = filesize($svdta['file']);
1421    }
1422    $svdta['sizechange'] = $filesize_new - $filesize_old;
1423
1424    $event->advise_after();
1425
1426    addLogEntry(
1427        $svdta['newRevision'],
1428        $svdta['id'],
1429        $svdta['changeType'],
1430        $svdta['summary'],
1431        $svdta['changeInfo'],
1432        null,
1433        $svdta['sizechange']
1434    );
1435
1436    // send notify mails
1437    notify($svdta['id'], 'admin', $svdta['oldRevision'], $svdta['summary'], $minor, $svdta['newRevision']);
1438    notify($svdta['id'], 'subscribers', $svdta['oldRevision'], $svdta['summary'], $minor, $svdta['newRevision']);
1439
1440    // update the purgefile (timestamp of the last time anything within the wiki was changed)
1441    io_saveFile($conf['cachedir'].'/purgefile', time());
1442
1443    // if useheading is enabled, purge the cache of all linking pages
1444    if(useHeading('content')) {
1445        $pages = ft_backlinks($id, true);
1446        foreach($pages as $page) {
1447            $cache = new CacheRenderer($page, wikiFN($page), 'xhtml');
1448            $cache->removeCache();
1449        }
1450    }
1451}
1452
1453/**
1454 * moves the current version to the attic and returns its
1455 * revision date
1456 *
1457 * @author Andreas Gohr <andi@splitbrain.org>
1458 *
1459 * @param string $id page id
1460 * @return int|string revision timestamp
1461 */
1462function saveOldRevision($id) {
1463    $oldf = wikiFN($id);
1464    if(!file_exists($oldf)) return '';
1465    $date = filemtime($oldf);
1466    $newf = wikiFN($id, $date);
1467    io_writeWikiPage($newf, rawWiki($id), $id, $date);
1468    return $date;
1469}
1470
1471/**
1472 * Sends a notify mail on page change or registration
1473 *
1474 * @param string     $id       The changed page
1475 * @param string     $who      Who to notify (admin|subscribers|register)
1476 * @param int|string $rev Old page revision
1477 * @param string     $summary  What changed
1478 * @param boolean    $minor    Is this a minor edit?
1479 * @param string[]   $replace  Additional string substitutions, @KEY@ to be replaced by value
1480 * @param int|string $current_rev  New page revision
1481 * @return bool
1482 *
1483 * @author Andreas Gohr <andi@splitbrain.org>
1484 */
1485function notify($id, $who, $rev = '', $summary = '', $minor = false, $replace = array(), $current_rev = false) {
1486    global $conf;
1487    /* @var Input $INPUT */
1488    global $INPUT;
1489
1490    // decide if there is something to do, eg. whom to mail
1491    if($who == 'admin') {
1492        if(empty($conf['notify'])) return false; //notify enabled?
1493        $tpl = 'mailtext';
1494        $to  = $conf['notify'];
1495    } elseif($who == 'subscribers') {
1496        if(!actionOK('subscribe')) return false; //subscribers enabled?
1497        if($conf['useacl'] && $INPUT->server->str('REMOTE_USER') && $minor) return false; //skip minors
1498        $data = array('id' => $id, 'addresslist' => '', 'self' => false, 'replacements' => $replace);
1499        Event::createAndTrigger(
1500            'COMMON_NOTIFY_ADDRESSLIST', $data,
1501            array(new Subscription(), 'notifyaddresses')
1502        );
1503        $to = $data['addresslist'];
1504        if(empty($to)) return false;
1505        $tpl = 'subscr_single';
1506    } else {
1507        return false; //just to be safe
1508    }
1509
1510    // prepare content
1511    $subscription = new PageSubscriptionSender();
1512    return $subscription->sendPageDiff($to, $tpl, $id, $rev, $summary, $current_rev);
1513}
1514
1515/**
1516 * extracts the query from a search engine referrer
1517 *
1518 * @author Andreas Gohr <andi@splitbrain.org>
1519 * @author Todd Augsburger <todd@rollerorgans.com>
1520 *
1521 * @return array|string
1522 */
1523function getGoogleQuery() {
1524    /* @var Input $INPUT */
1525    global $INPUT;
1526
1527    if(!$INPUT->server->has('HTTP_REFERER')) {
1528        return '';
1529    }
1530    $url = parse_url($INPUT->server->str('HTTP_REFERER'));
1531
1532    // only handle common SEs
1533    if(!preg_match('/(google|bing|yahoo|ask|duckduckgo|babylon|aol|yandex)/',$url['host'])) return '';
1534
1535    $query = array();
1536    parse_str($url['query'], $query);
1537
1538    $q = '';
1539    if(isset($query['q'])){
1540        $q = $query['q'];
1541    }elseif(isset($query['p'])){
1542        $q = $query['p'];
1543    }elseif(isset($query['query'])){
1544        $q = $query['query'];
1545    }
1546    $q = trim($q);
1547
1548    if(!$q) return '';
1549    // ignore if query includes a full URL
1550    if(strpos($q, '//') !== false) return '';
1551    $q = preg_split('/[\s\'"\\\\`()\]\[?:!\.{};,#+*<>\\/]+/', $q, -1, PREG_SPLIT_NO_EMPTY);
1552    return $q;
1553}
1554
1555/**
1556 * Return the human readable size of a file
1557 *
1558 * @param int $size A file size
1559 * @param int $dec A number of decimal places
1560 * @return string human readable size
1561 *
1562 * @author      Martin Benjamin <b.martin@cybernet.ch>
1563 * @author      Aidan Lister <aidan@php.net>
1564 * @version     1.0.0
1565 */
1566function filesize_h($size, $dec = 1) {
1567    $sizes = array('B', 'KB', 'MB', 'GB');
1568    $count = count($sizes);
1569    $i     = 0;
1570
1571    while($size >= 1024 && ($i < $count - 1)) {
1572        $size /= 1024;
1573        $i++;
1574    }
1575
1576    return round($size, $dec)."\xC2\xA0".$sizes[$i]; //non-breaking space
1577}
1578
1579/**
1580 * Return the given timestamp as human readable, fuzzy age
1581 *
1582 * @author Andreas Gohr <gohr@cosmocode.de>
1583 *
1584 * @param int $dt timestamp
1585 * @return string
1586 */
1587function datetime_h($dt) {
1588    global $lang;
1589
1590    $ago = time() - $dt;
1591    if($ago > 24 * 60 * 60 * 30 * 12 * 2) {
1592        return sprintf($lang['years'], round($ago / (24 * 60 * 60 * 30 * 12)));
1593    }
1594    if($ago > 24 * 60 * 60 * 30 * 2) {
1595        return sprintf($lang['months'], round($ago / (24 * 60 * 60 * 30)));
1596    }
1597    if($ago > 24 * 60 * 60 * 7 * 2) {
1598        return sprintf($lang['weeks'], round($ago / (24 * 60 * 60 * 7)));
1599    }
1600    if($ago > 24 * 60 * 60 * 2) {
1601        return sprintf($lang['days'], round($ago / (24 * 60 * 60)));
1602    }
1603    if($ago > 60 * 60 * 2) {
1604        return sprintf($lang['hours'], round($ago / (60 * 60)));
1605    }
1606    if($ago > 60 * 2) {
1607        return sprintf($lang['minutes'], round($ago / (60)));
1608    }
1609    return sprintf($lang['seconds'], $ago);
1610}
1611
1612/**
1613 * Wraps around strftime but provides support for fuzzy dates
1614 *
1615 * The format default to $conf['dformat']. It is passed to
1616 * strftime - %f can be used to get the value from datetime_h()
1617 *
1618 * @see datetime_h
1619 * @author Andreas Gohr <gohr@cosmocode.de>
1620 *
1621 * @param int|null $dt      timestamp when given, null will take current timestamp
1622 * @param string   $format  empty default to $conf['dformat'], or provide format as recognized by strftime()
1623 * @return string
1624 */
1625function dformat($dt = null, $format = '') {
1626    global $conf;
1627
1628    if(is_null($dt)) $dt = time();
1629    $dt = (int) $dt;
1630    if(!$format) $format = $conf['dformat'];
1631
1632    $format = str_replace('%f', datetime_h($dt), $format);
1633    return strftime($format, $dt);
1634}
1635
1636/**
1637 * Formats a timestamp as ISO 8601 date
1638 *
1639 * @author <ungu at terong dot com>
1640 * @link http://php.net/manual/en/function.date.php#54072
1641 *
1642 * @param int $int_date current date in UNIX timestamp
1643 * @return string
1644 */
1645function date_iso8601($int_date) {
1646    $date_mod     = date('Y-m-d\TH:i:s', $int_date);
1647    $pre_timezone = date('O', $int_date);
1648    $time_zone    = substr($pre_timezone, 0, 3).":".substr($pre_timezone, 3, 2);
1649    $date_mod .= $time_zone;
1650    return $date_mod;
1651}
1652
1653/**
1654 * return an obfuscated email address in line with $conf['mailguard'] setting
1655 *
1656 * @author Harry Fuecks <hfuecks@gmail.com>
1657 * @author Christopher Smith <chris@jalakai.co.uk>
1658 *
1659 * @param string $email email address
1660 * @return string
1661 */
1662function obfuscate($email) {
1663    global $conf;
1664
1665    switch($conf['mailguard']) {
1666        case 'visible' :
1667            $obfuscate = array('@' => ' [at] ', '.' => ' [dot] ', '-' => ' [dash] ');
1668            return strtr($email, $obfuscate);
1669
1670        case 'hex' :
1671            return utf8_tohtml($email, true);
1672
1673        case 'none' :
1674        default :
1675            return $email;
1676    }
1677}
1678
1679/**
1680 * Removes quoting backslashes
1681 *
1682 * @author Andreas Gohr <andi@splitbrain.org>
1683 *
1684 * @param string $string
1685 * @param string $char backslashed character
1686 * @return string
1687 */
1688function unslash($string, $char = "'") {
1689    return str_replace('\\'.$char, $char, $string);
1690}
1691
1692/**
1693 * Convert php.ini shorthands to byte
1694 *
1695 * On 32 bit systems values >= 2GB will fail!
1696 *
1697 * -1 (infinite size) will be reported as -1
1698 *
1699 * @link   https://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
1700 * @param string $value PHP size shorthand
1701 * @return int
1702 */
1703function php_to_byte($value) {
1704    switch (strtoupper(substr($value,-1))) {
1705        case 'G':
1706            $ret = intval(substr($value, 0, -1)) * 1024 * 1024 * 1024;
1707            break;
1708        case 'M':
1709            $ret = intval(substr($value, 0, -1)) * 1024 * 1024;
1710            break;
1711        case 'K':
1712            $ret = intval(substr($value, 0, -1)) * 1024;
1713            break;
1714        default:
1715            $ret = intval($value);
1716            break;
1717    }
1718    return $ret;
1719}
1720
1721/**
1722 * Wrapper around preg_quote adding the default delimiter
1723 *
1724 * @param string $string
1725 * @return string
1726 */
1727function preg_quote_cb($string) {
1728    return preg_quote($string, '/');
1729}
1730
1731/**
1732 * Shorten a given string by removing data from the middle
1733 *
1734 * You can give the string in two parts, the first part $keep
1735 * will never be shortened. The second part $short will be cut
1736 * in the middle to shorten but only if at least $min chars are
1737 * left to display it. Otherwise it will be left off.
1738 *
1739 * @param string $keep   the part to keep
1740 * @param string $short  the part to shorten
1741 * @param int    $max    maximum chars you want for the whole string
1742 * @param int    $min    minimum number of chars to have left for middle shortening
1743 * @param string $char   the shortening character to use
1744 * @return string
1745 */
1746function shorten($keep, $short, $max, $min = 9, $char = '…') {
1747    $max = $max - \dokuwiki\Utf8\PhpString::strlen($keep);
1748    if($max < $min) return $keep;
1749    $len = \dokuwiki\Utf8\PhpString::strlen($short);
1750    if($len <= $max) return $keep.$short;
1751    $half = floor($max / 2);
1752    return $keep .
1753        \dokuwiki\Utf8\PhpString::substr($short, 0, $half - 1) .
1754        $char .
1755        \dokuwiki\Utf8\PhpString::substr($short, $len - $half);
1756}
1757
1758/**
1759 * Return the users real name or e-mail address for use
1760 * in page footer and recent changes pages
1761 *
1762 * @param string|null $username or null when currently logged-in user should be used
1763 * @param bool $textonly true returns only plain text, true allows returning html
1764 * @return string html or plain text(not escaped) of formatted user name
1765 *
1766 * @author Andy Webber <dokuwiki AT andywebber DOT com>
1767 */
1768function editorinfo($username, $textonly = false) {
1769    return userlink($username, $textonly);
1770}
1771
1772/**
1773 * Returns users realname w/o link
1774 *
1775 * @param string|null $username or null when currently logged-in user should be used
1776 * @param bool $textonly true returns only plain text, true allows returning html
1777 * @return string html or plain text(not escaped) of formatted user name
1778 *
1779 * @triggers COMMON_USER_LINK
1780 */
1781function userlink($username = null, $textonly = false) {
1782    global $conf, $INFO;
1783    /** @var AuthPlugin $auth */
1784    global $auth;
1785    /** @var Input $INPUT */
1786    global $INPUT;
1787
1788    // prepare initial event data
1789    $data = array(
1790        'username' => $username, // the unique user name
1791        'name' => '',
1792        'link' => array( //setting 'link' to false disables linking
1793                         'target' => '',
1794                         'pre' => '',
1795                         'suf' => '',
1796                         'style' => '',
1797                         'more' => '',
1798                         'url' => '',
1799                         'title' => '',
1800                         'class' => ''
1801        ),
1802        'userlink' => '', // formatted user name as will be returned
1803        'textonly' => $textonly
1804    );
1805    if($username === null) {
1806        $data['username'] = $username = $INPUT->server->str('REMOTE_USER');
1807        if($textonly){
1808            $data['name'] = $INFO['userinfo']['name']. ' (' . $INPUT->server->str('REMOTE_USER') . ')';
1809        }else {
1810            $data['name'] = '<bdi>' . hsc($INFO['userinfo']['name']) . '</bdi> '.
1811                '(<bdi>' . hsc($INPUT->server->str('REMOTE_USER')) . '</bdi>)';
1812        }
1813    }
1814
1815    $evt = new Event('COMMON_USER_LINK', $data);
1816    if($evt->advise_before(true)) {
1817        if(empty($data['name'])) {
1818            if($auth) $info = $auth->getUserData($username);
1819            if($conf['showuseras'] != 'loginname' && isset($info) && $info) {
1820                switch($conf['showuseras']) {
1821                    case 'username':
1822                    case 'username_link':
1823                        $data['name'] = $textonly ? $info['name'] : hsc($info['name']);
1824                        break;
1825                    case 'email':
1826                    case 'email_link':
1827                        $data['name'] = obfuscate($info['mail']);
1828                        break;
1829                }
1830            } else {
1831                $data['name'] = $textonly ? $data['username'] : hsc($data['username']);
1832            }
1833        }
1834
1835        /** @var Doku_Renderer_xhtml $xhtml_renderer */
1836        static $xhtml_renderer = null;
1837
1838        if(!$data['textonly'] && empty($data['link']['url'])) {
1839
1840            if(in_array($conf['showuseras'], array('email_link', 'username_link'))) {
1841                if(!isset($info)) {
1842                    if($auth) $info = $auth->getUserData($username);
1843                }
1844                if(isset($info) && $info) {
1845                    if($conf['showuseras'] == 'email_link') {
1846                        $data['link']['url'] = 'mailto:' . obfuscate($info['mail']);
1847                    } else {
1848                        if(is_null($xhtml_renderer)) {
1849                            $xhtml_renderer = p_get_renderer('xhtml');
1850                        }
1851                        if(empty($xhtml_renderer->interwiki)) {
1852                            $xhtml_renderer->interwiki = getInterwiki();
1853                        }
1854                        $shortcut = 'user';
1855                        $exists = null;
1856                        $data['link']['url'] = $xhtml_renderer->_resolveInterWiki($shortcut, $username, $exists);
1857                        $data['link']['class'] .= ' interwiki iw_user';
1858                        if($exists !== null) {
1859                            if($exists) {
1860                                $data['link']['class'] .= ' wikilink1';
1861                            } else {
1862                                $data['link']['class'] .= ' wikilink2';
1863                                $data['link']['rel'] = 'nofollow';
1864                            }
1865                        }
1866                    }
1867                } else {
1868                    $data['textonly'] = true;
1869                }
1870
1871            } else {
1872                $data['textonly'] = true;
1873            }
1874        }
1875
1876        if($data['textonly']) {
1877            $data['userlink'] = $data['name'];
1878        } else {
1879            $data['link']['name'] = $data['name'];
1880            if(is_null($xhtml_renderer)) {
1881                $xhtml_renderer = p_get_renderer('xhtml');
1882            }
1883            $data['userlink'] = $xhtml_renderer->_formatLink($data['link']);
1884        }
1885    }
1886    $evt->advise_after();
1887    unset($evt);
1888
1889    return $data['userlink'];
1890}
1891
1892/**
1893 * Returns the path to a image file for the currently chosen license.
1894 * When no image exists, returns an empty string
1895 *
1896 * @author Andreas Gohr <andi@splitbrain.org>
1897 *
1898 * @param  string $type - type of image 'badge' or 'button'
1899 * @return string
1900 */
1901function license_img($type) {
1902    global $license;
1903    global $conf;
1904    if(!$conf['license']) return '';
1905    if(!is_array($license[$conf['license']])) return '';
1906    $try   = array();
1907    $try[] = 'lib/images/license/'.$type.'/'.$conf['license'].'.png';
1908    $try[] = 'lib/images/license/'.$type.'/'.$conf['license'].'.gif';
1909    if(substr($conf['license'], 0, 3) == 'cc-') {
1910        $try[] = 'lib/images/license/'.$type.'/cc.png';
1911    }
1912    foreach($try as $src) {
1913        if(file_exists(DOKU_INC.$src)) return $src;
1914    }
1915    return '';
1916}
1917
1918/**
1919 * Checks if the given amount of memory is available
1920 *
1921 * If the memory_get_usage() function is not available the
1922 * function just assumes $bytes of already allocated memory
1923 *
1924 * @author Filip Oscadal <webmaster@illusionsoftworks.cz>
1925 * @author Andreas Gohr <andi@splitbrain.org>
1926 *
1927 * @param int  $mem    Size of memory you want to allocate in bytes
1928 * @param int  $bytes  already allocated memory (see above)
1929 * @return bool
1930 */
1931function is_mem_available($mem, $bytes = 1048576) {
1932    $limit = trim(ini_get('memory_limit'));
1933    if(empty($limit)) return true; // no limit set!
1934    if($limit == -1) return true; // unlimited
1935
1936    // parse limit to bytes
1937    $limit = php_to_byte($limit);
1938
1939    // get used memory if possible
1940    if(function_exists('memory_get_usage')) {
1941        $used = memory_get_usage();
1942    } else {
1943        $used = $bytes;
1944    }
1945
1946    if($used + $mem > $limit) {
1947        return false;
1948    }
1949
1950    return true;
1951}
1952
1953/**
1954 * Send a HTTP redirect to the browser
1955 *
1956 * Works arround Microsoft IIS cookie sending bug. Exits the script.
1957 *
1958 * @link   http://support.microsoft.com/kb/q176113/
1959 * @author Andreas Gohr <andi@splitbrain.org>
1960 *
1961 * @param string $url url being directed to
1962 */
1963function send_redirect($url) {
1964    $url = stripctl($url); // defend against HTTP Response Splitting
1965
1966    /* @var Input $INPUT */
1967    global $INPUT;
1968
1969    //are there any undisplayed messages? keep them in session for display
1970    global $MSG;
1971    if(isset($MSG) && count($MSG) && !defined('NOSESSION')) {
1972        //reopen session, store data and close session again
1973        @session_start();
1974        $_SESSION[DOKU_COOKIE]['msg'] = $MSG;
1975    }
1976
1977    // always close the session
1978    session_write_close();
1979
1980    // check if running on IIS < 6 with CGI-PHP
1981    if($INPUT->server->has('SERVER_SOFTWARE') && $INPUT->server->has('GATEWAY_INTERFACE') &&
1982        (strpos($INPUT->server->str('GATEWAY_INTERFACE'), 'CGI') !== false) &&
1983        (preg_match('|^Microsoft-IIS/(\d)\.\d$|', trim($INPUT->server->str('SERVER_SOFTWARE')), $matches)) &&
1984        $matches[1] < 6
1985    ) {
1986        header('Refresh: 0;url='.$url);
1987    } else {
1988        header('Location: '.$url);
1989    }
1990
1991    // no exits during unit tests
1992    if(defined('DOKU_UNITTEST')) {
1993        // pass info about the redirect back to the test suite
1994        $testRequest = TestRequest::getRunning();
1995        if($testRequest !== null) {
1996            $testRequest->addData('send_redirect', $url);
1997        }
1998        return;
1999    }
2000
2001    exit;
2002}
2003
2004/**
2005 * Validate a value using a set of valid values
2006 *
2007 * This function checks whether a specified value is set and in the array
2008 * $valid_values. If not, the function returns a default value or, if no
2009 * default is specified, throws an exception.
2010 *
2011 * @param string $param        The name of the parameter
2012 * @param array  $valid_values A set of valid values; Optionally a default may
2013 *                             be marked by the key “default”.
2014 * @param array  $array        The array containing the value (typically $_POST
2015 *                             or $_GET)
2016 * @param string $exc          The text of the raised exception
2017 *
2018 * @throws Exception
2019 * @return mixed
2020 * @author Adrian Lang <lang@cosmocode.de>
2021 */
2022function valid_input_set($param, $valid_values, $array, $exc = '') {
2023    if(isset($array[$param]) && in_array($array[$param], $valid_values)) {
2024        return $array[$param];
2025    } elseif(isset($valid_values['default'])) {
2026        return $valid_values['default'];
2027    } else {
2028        throw new Exception($exc);
2029    }
2030}
2031
2032/**
2033 * Read a preference from the DokuWiki cookie
2034 * (remembering both keys & values are urlencoded)
2035 *
2036 * @param string $pref     preference key
2037 * @param mixed  $default  value returned when preference not found
2038 * @return string preference value
2039 */
2040function get_doku_pref($pref, $default) {
2041    $enc_pref = urlencode($pref);
2042    if(isset($_COOKIE['DOKU_PREFS']) && strpos($_COOKIE['DOKU_PREFS'], $enc_pref) !== false) {
2043        $parts = explode('#', $_COOKIE['DOKU_PREFS']);
2044        $cnt   = count($parts);
2045
2046        // due to #2721 there might be duplicate entries,
2047        // so we read from the end
2048        for($i = $cnt-2; $i >= 0; $i -= 2) {
2049            if($parts[$i] == $enc_pref) {
2050                return urldecode($parts[$i + 1]);
2051            }
2052        }
2053    }
2054    return $default;
2055}
2056
2057/**
2058 * Add a preference to the DokuWiki cookie
2059 * (remembering $_COOKIE['DOKU_PREFS'] is urlencoded)
2060 * Remove it by setting $val to false
2061 *
2062 * @param string $pref  preference key
2063 * @param string $val   preference value
2064 */
2065function set_doku_pref($pref, $val) {
2066    global $conf;
2067    $orig = get_doku_pref($pref, false);
2068    $cookieVal = '';
2069
2070    if($orig !== false && ($orig !== $val)) {
2071        $parts = explode('#', $_COOKIE['DOKU_PREFS']);
2072        $cnt   = count($parts);
2073        // urlencode $pref for the comparison
2074        $enc_pref = rawurlencode($pref);
2075        $seen = false;
2076        for ($i = 0; $i < $cnt; $i += 2) {
2077            if ($parts[$i] == $enc_pref) {
2078                if (!$seen){
2079                    if ($val !== false) {
2080                        $parts[$i + 1] = rawurlencode($val);
2081                    } else {
2082                        unset($parts[$i]);
2083                        unset($parts[$i + 1]);
2084                    }
2085                    $seen = true;
2086                } else {
2087                    // no break because we want to remove duplicate entries
2088                    unset($parts[$i]);
2089                    unset($parts[$i + 1]);
2090                }
2091            }
2092        }
2093        $cookieVal = implode('#', $parts);
2094    } else if ($orig === false && $val !== false) {
2095        $cookieVal = ($_COOKIE['DOKU_PREFS'] ? $_COOKIE['DOKU_PREFS'] . '#' : '') .
2096            rawurlencode($pref) . '#' . rawurlencode($val);
2097    }
2098
2099    $cookieDir = empty($conf['cookiedir']) ? DOKU_REL : $conf['cookiedir'];
2100    if(defined('DOKU_UNITTEST')) {
2101        $_COOKIE['DOKU_PREFS'] = $cookieVal;
2102    }else{
2103        setcookie('DOKU_PREFS', $cookieVal, time()+365*24*3600, $cookieDir, '', ($conf['securecookie'] && is_ssl()));
2104    }
2105}
2106
2107/**
2108 * Strips source mapping declarations from given text #601
2109 *
2110 * @param string &$text reference to the CSS or JavaScript code to clean
2111 */
2112function stripsourcemaps(&$text){
2113    $text = preg_replace('/^(\/\/|\/\*)[@#]\s+sourceMappingURL=.*?(\*\/)?$/im', '\\1\\2', $text);
2114}
2115
2116/**
2117 * Returns the contents of a given SVG file for embedding
2118 *
2119 * Inlining SVGs saves on HTTP requests and more importantly allows for styling them through
2120 * CSS. However it should used with small SVGs only. The $maxsize setting ensures only small
2121 * files are embedded.
2122 *
2123 * This strips unneeded headers, comments and newline. The result is not a vaild standalone SVG!
2124 *
2125 * @param string $file full path to the SVG file
2126 * @param int $maxsize maximum allowed size for the SVG to be embedded
2127 * @return string|false the SVG content, false if the file couldn't be loaded
2128 */
2129function inlineSVG($file, $maxsize = 2048) {
2130    $file = trim($file);
2131    if($file === '') return false;
2132    if(!file_exists($file)) return false;
2133    if(filesize($file) > $maxsize) return false;
2134    if(!is_readable($file)) return false;
2135    $content = file_get_contents($file);
2136    $content = preg_replace('/<!--.*?(-->)/s','', $content); // comments
2137    $content = preg_replace('/<\?xml .*?\?>/i', '', $content); // xml header
2138    $content = preg_replace('/<!DOCTYPE .*?>/i', '', $content); // doc type
2139    $content = preg_replace('/>\s+</s', '><', $content); // newlines between tags
2140    $content = trim($content);
2141    if(substr($content, 0, 5) !== '<svg ') return false;
2142    return $content;
2143}
2144
2145//Setup VIM: ex: et ts=2 :
2146