xref: /dokuwiki/inc/common.php (revision b2fcc742e10e700a52cea2d2c4ebf8bb440e35bd) 
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
9if(!defined('DOKU_INC')) die('meh.');
10
11/**
12 * These constants are used with the recents function
13 */
14define('RECENTS_SKIP_DELETED', 2);
15define('RECENTS_SKIP_MINORS', 4);
16define('RECENTS_SKIP_SUBSPACES', 8);
17define('RECENTS_MEDIA_CHANGES', 16);
18define('RECENTS_MEDIA_PAGES_MIXED', 32);
19
20/**
21 * Wrapper around htmlspecialchars()
22 *
23 * @author Andreas Gohr <andi@splitbrain.org>
24 * @see    htmlspecialchars()
25 *
26 * @param string $string the string being converted
27 * @return string converted string
28 */
29function hsc($string) {
30    return htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
31}
32
33/**
34 * Checks if the given input is blank
35 *
36 * This is similar to empty() but will return false for "0".
37 *
38 * Please note: when you pass uninitialized variables, they will implicitly be created
39 * with a NULL value without warning.
40 *
41 * To avoid this it's recommended to guard the call with isset like this:
42 *
43 * (isset($foo) && !blank($foo))
44 * (!isset($foo) || blank($foo))
45 *
46 * @param $in
47 * @param bool $trim Consider a string of whitespace to be blank
48 * @return bool
49 */
50function blank(&$in, $trim = false) {
51    if(is_null($in)) return true;
52    if(is_array($in)) return empty($in);
53    if($in === "\0") return true;
54    if($trim && trim($in) === '') return true;
55    if(strlen($in) > 0) return false;
56    return empty($in);
57}
58
59/**
60 * print a newline terminated string
61 *
62 * You can give an indention as optional parameter
63 *
64 * @author Andreas Gohr <andi@splitbrain.org>
65 *
66 * @param string $string  line of text
67 * @param int    $indent  number of spaces indention
68 */
69function ptln($string, $indent = 0) {
70    echo str_repeat(' ', $indent)."$string\n";
71}
72
73/**
74 * strips control characters (<32) from the given string
75 *
76 * @author Andreas Gohr <andi@splitbrain.org>
77 *
78 * @param string $string being stripped
79 * @return string
80 */
81function stripctl($string) {
82    return preg_replace('/[\x00-\x1F]+/s', '', $string);
83}
84
85/**
86 * Return a secret token to be used for CSRF attack prevention
87 *
88 * @author  Andreas Gohr <andi@splitbrain.org>
89 * @link    http://en.wikipedia.org/wiki/Cross-site_request_forgery
90 * @link    http://christ1an.blogspot.com/2007/04/preventing-csrf-efficiently.html
91 *
92 * @return  string
93 */
94function getSecurityToken() {
95    /** @var Input $INPUT */
96    global $INPUT;
97
98    $user = $INPUT->server->str('REMOTE_USER');
99    $session = session_id();
100
101    // CSRF checks are only for logged in users - do not generate for anonymous
102    if(trim($user) == '' || trim($session) == '') return '';
103    return PassHash::hmac('md5', $session.$user, auth_cookiesalt());
104}
105
106/**
107 * Check the secret CSRF token
108 *
109 * @param null|string $token security token or null to read it from request variable
110 * @return bool success if the token matched
111 */
112function checkSecurityToken($token = null) {
113    /** @var Input $INPUT */
114    global $INPUT;
115    if(!$INPUT->server->str('REMOTE_USER')) return true; // no logged in user, no need for a check
116
117    if(is_null($token)) $token = $INPUT->str('sectok');
118    if(getSecurityToken() != $token) {
119        msg('Security Token did not match. Possible CSRF attack.', -1);
120        return false;
121    }
122    return true;
123}
124
125/**
126 * Print a hidden form field with a secret CSRF token
127 *
128 * @author  Andreas Gohr <andi@splitbrain.org>
129 *
130 * @param bool $print  if true print the field, otherwise html of the field is returned
131 * @return string html of hidden form field
132 */
133function formSecurityToken($print = true) {
134    $ret = '<div class="no"><input type="hidden" name="sectok" value="'.getSecurityToken().'" /></div>'."\n";
135    if($print) echo $ret;
136    return $ret;
137}
138
139/**
140 * Determine basic information for a request of $id
141 *
142 * @author Andreas Gohr <andi@splitbrain.org>
143 * @author Chris Smith <chris@jalakai.co.uk>
144 *
145 * @param string $id         pageid
146 * @param bool   $htmlClient add info about whether is mobile browser
147 * @return array with info for a request of $id
148 *
149 */
150function basicinfo($id, $htmlClient=true){
151    global $USERINFO;
152    /* @var Input $INPUT */
153    global $INPUT;
154
155    // set info about manager/admin status.
156    $info = array();
157    $info['isadmin']   = false;
158    $info['ismanager'] = false;
159    if($INPUT->server->has('REMOTE_USER')) {
160        $info['userinfo']   = $USERINFO;
161        $info['perm']       = auth_quickaclcheck($id);
162        $info['client']     = $INPUT->server->str('REMOTE_USER');
163
164        if($info['perm'] == AUTH_ADMIN) {
165            $info['isadmin']   = true;
166            $info['ismanager'] = true;
167        } elseif(auth_ismanager()) {
168            $info['ismanager'] = true;
169        }
170
171        // if some outside auth were used only REMOTE_USER is set
172        if(!$info['userinfo']['name']) {
173            $info['userinfo']['name'] = $INPUT->server->str('REMOTE_USER');
174        }
175
176    } else {
177        $info['perm']       = auth_aclcheck($id, '', null);
178        $info['client']     = clientIP(true);
179    }
180
181    $info['namespace'] = getNS($id);
182
183    // mobile detection
184    if ($htmlClient) {
185        $info['ismobile'] = clientismobile();
186    }
187
188    return $info;
189 }
190
191/**
192 * Return info about the current document as associative
193 * array.
194 *
195 * @author Andreas Gohr <andi@splitbrain.org>
196 *
197 * @return array with info about current document
198 */
199function pageinfo() {
200    global $ID;
201    global $REV;
202    global $RANGE;
203    global $lang;
204    /* @var Input $INPUT */
205    global $INPUT;
206
207    $info = basicinfo($ID);
208
209    // include ID & REV not redundant, as some parts of DokuWiki may temporarily change $ID, e.g. p_wiki_xhtml
210    // FIXME ... perhaps it would be better to ensure the temporary changes weren't necessary
211    $info['id']  = $ID;
212    $info['rev'] = $REV;
213
214    if($INPUT->server->has('REMOTE_USER')) {
215        $sub = new Subscription();
216        $info['subscribed'] = $sub->user_subscription();
217    } else {
218        $info['subscribed'] = false;
219    }
220
221    $info['locked']     = checklock($ID);
222    $info['filepath']   = wikiFN($ID);
223    $info['exists']     = file_exists($info['filepath']);
224    $info['currentrev'] = @filemtime($info['filepath']);
225    if($REV) {
226        //check if current revision was meant
227        if($info['exists'] && ($info['currentrev'] == $REV)) {
228            $REV = '';
229        } elseif($RANGE) {
230            //section editing does not work with old revisions!
231            $REV   = '';
232            $RANGE = '';
233            msg($lang['nosecedit'], 0);
234        } else {
235            //really use old revision
236            $info['filepath'] = wikiFN($ID, $REV);
237            $info['exists']   = file_exists($info['filepath']);
238        }
239    }
240    $info['rev'] = $REV;
241    if($info['exists']) {
242        $info['writable'] = (is_writable($info['filepath']) &&
243            ($info['perm'] >= AUTH_EDIT));
244    } else {
245        $info['writable'] = ($info['perm'] >= AUTH_CREATE);
246    }
247    $info['editable'] = ($info['writable'] && empty($info['locked']));
248    $info['lastmod']  = @filemtime($info['filepath']);
249
250    //load page meta data
251    $info['meta'] = p_get_metadata($ID);
252
253    //who's the editor
254    $pagelog = new PageChangeLog($ID, 1024);
255    if($REV) {
256        $revinfo = $pagelog->getRevisionInfo($REV);
257    } else {
258        if(!empty($info['meta']['last_change']) && is_array($info['meta']['last_change'])) {
259            $revinfo = $info['meta']['last_change'];
260        } else {
261            $revinfo = $pagelog->getRevisionInfo($info['lastmod']);
262            // cache most recent changelog line in metadata if missing and still valid
263            if($revinfo !== false) {
264                $info['meta']['last_change'] = $revinfo;
265                p_set_metadata($ID, array('last_change' => $revinfo));
266            }
267        }
268    }
269    //and check for an external edit
270    if($revinfo !== false && $revinfo['date'] != $info['lastmod']) {
271        // cached changelog line no longer valid
272        $revinfo                     = false;
273        $info['meta']['last_change'] = $revinfo;
274        p_set_metadata($ID, array('last_change' => $revinfo));
275    }
276
277    $info['ip']   = $revinfo['ip'];
278    $info['user'] = $revinfo['user'];
279    $info['sum']  = $revinfo['sum'];
280    // See also $INFO['meta']['last_change'] which is the most recent log line for page $ID.
281    // Use $INFO['meta']['last_change']['type']===DOKU_CHANGE_TYPE_MINOR_EDIT in place of $info['minor'].
282
283    if($revinfo['user']) {
284        $info['editor'] = $revinfo['user'];
285    } else {
286        $info['editor'] = $revinfo['ip'];
287    }
288
289    // draft
290    $draft = new \dokuwiki\Draft($ID, $info['client']);
291    if ($draft->isDraftAvailable()) {
292        $info['draft'] = $draft->getDraftFilename();
293    }
294
295    return $info;
296}
297
298/**
299 * Initialize and/or fill global $JSINFO with some basic info to be given to javascript
300 */
301function jsinfo() {
302    global $JSINFO, $ID, $INFO, $ACT;
303
304    if (!is_array($JSINFO)) {
305        $JSINFO = [];
306    }
307    //export minimal info to JS, plugins can add more
308    $JSINFO['id']                    = $ID;
309    $JSINFO['namespace']             = (string) $INFO['namespace'];
310    $JSINFO['ACT']                   = act_clean($ACT);
311    $JSINFO['useHeadingNavigation']  = (int) useHeading('navigation');
312    $JSINFO['useHeadingContent']     = (int) useHeading('content');
313}
314
315/**
316 * Return information about the current media item as an associative array.
317 *
318 * @return array with info about current media item
319 */
320function mediainfo(){
321    global $NS;
322    global $IMG;
323
324    $info = basicinfo("$NS:*");
325    $info['image'] = $IMG;
326
327    return $info;
328}
329
330/**
331 * Build an string of URL parameters
332 *
333 * @author Andreas Gohr
334 *
335 * @param array  $params    array with key-value pairs
336 * @param string $sep       series of pairs are separated by this character
337 * @return string query string
338 */
339function buildURLparams($params, $sep = '&amp;') {
340    $url = '';
341    $amp = false;
342    foreach($params as $key => $val) {
343        if($amp) $url .= $sep;
344
345        $url .= rawurlencode($key).'=';
346        $url .= rawurlencode((string) $val);
347        $amp = true;
348    }
349    return $url;
350}
351
352/**
353 * Build an string of html tag attributes
354 *
355 * Skips keys starting with '_', values get HTML encoded
356 *
357 * @author Andreas Gohr
358 *
359 * @param array $params    array with (attribute name-attribute value) pairs
360 * @param bool  $skipempty skip empty string values?
361 * @return string
362 */
363function buildAttributes($params, $skipempty = false) {
364    $url   = '';
365    $white = false;
366    foreach($params as $key => $val) {
367        if($key{0} == '_') continue;
368        if($val === '' && $skipempty) continue;
369        if($white) $url .= ' ';
370
371        $url .= $key.'="';
372        $url .= htmlspecialchars($val);
373        $url .= '"';
374        $white = true;
375    }
376    return $url;
377}
378
379/**
380 * This builds the breadcrumb trail and returns it as array
381 *
382 * @author Andreas Gohr <andi@splitbrain.org>
383 *
384 * @return string[] with the data: array(pageid=>name, ... )
385 */
386function breadcrumbs() {
387    // we prepare the breadcrumbs early for quick session closing
388    static $crumbs = null;
389    if($crumbs != null) return $crumbs;
390
391    global $ID;
392    global $ACT;
393    global $conf;
394
395    //first visit?
396    $crumbs = isset($_SESSION[DOKU_COOKIE]['bc']) ? $_SESSION[DOKU_COOKIE]['bc'] : array();
397    //we only save on show and existing visible wiki documents
398    $file = wikiFN($ID);
399    if($ACT != 'show' || isHiddenPage($ID) || !file_exists($file)) {
400        $_SESSION[DOKU_COOKIE]['bc'] = $crumbs;
401        return $crumbs;
402    }
403
404    // page names
405    $name = noNSorNS($ID);
406    if(useHeading('navigation')) {
407        // get page title
408        $title = p_get_first_heading($ID, METADATA_RENDER_USING_SIMPLE_CACHE);
409        if($title) {
410            $name = $title;
411        }
412    }
413
414    //remove ID from array
415    if(isset($crumbs[$ID])) {
416        unset($crumbs[$ID]);
417    }
418
419    //add to array
420    $crumbs[$ID] = $name;
421    //reduce size
422    while(count($crumbs) > $conf['breadcrumbs']) {
423        array_shift($crumbs);
424    }
425    //save to session
426    $_SESSION[DOKU_COOKIE]['bc'] = $crumbs;
427    return $crumbs;
428}
429
430/**
431 * Filter for page IDs
432 *
433 * This is run on a ID before it is outputted somewhere
434 * currently used to replace the colon with something else
435 * on Windows (non-IIS) systems and to have proper URL encoding
436 *
437 * See discussions at https://github.com/splitbrain/dokuwiki/pull/84 and
438 * https://github.com/splitbrain/dokuwiki/pull/173 why we use a whitelist of
439 * unaffected servers instead of blacklisting affected servers here.
440 *
441 * Urlencoding is ommitted when the second parameter is false
442 *
443 * @author Andreas Gohr <andi@splitbrain.org>
444 *
445 * @param string $id pageid being filtered
446 * @param bool   $ue apply urlencoding?
447 * @return string
448 */
449function idfilter($id, $ue = true) {
450    global $conf;
451    /* @var Input $INPUT */
452    global $INPUT;
453
454    if($conf['useslash'] && $conf['userewrite']) {
455        $id = strtr($id, ':', '/');
456    } elseif(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' &&
457        $conf['userewrite'] &&
458        strpos($INPUT->server->str('SERVER_SOFTWARE'), 'Microsoft-IIS') === false
459    ) {
460        $id = strtr($id, ':', ';');
461    }
462    if($ue) {
463        $id = rawurlencode($id);
464        $id = str_replace('%3A', ':', $id); //keep as colon
465        $id = str_replace('%3B', ';', $id); //keep as semicolon
466        $id = str_replace('%2F', '/', $id); //keep as slash
467    }
468    return $id;
469}
470
471/**
472 * This builds a link to a wikipage
473 *
474 * It handles URL rewriting and adds additional parameters
475 *
476 * @author Andreas Gohr <andi@splitbrain.org>
477 *
478 * @param string       $id             page id, defaults to start page
479 * @param string|array $urlParameters  URL parameters, associative array recommended
480 * @param bool         $absolute       request an absolute URL instead of relative
481 * @param string       $separator      parameter separator
482 * @return string
483 */
484function wl($id = '', $urlParameters = '', $absolute = false, $separator = '&amp;') {
485    global $conf;
486    if(is_array($urlParameters)) {
487        if(isset($urlParameters['rev']) && !$urlParameters['rev']) unset($urlParameters['rev']);
488        if(isset($urlParameters['at']) && $conf['date_at_format']) $urlParameters['at'] = date($conf['date_at_format'],$urlParameters['at']);
489        $urlParameters = buildURLparams($urlParameters, $separator);
490    } else {
491        $urlParameters = str_replace(',', $separator, $urlParameters);
492    }
493    if($id === '') {
494        $id = $conf['start'];
495    }
496    $id = idfilter($id);
497    if($absolute) {
498        $xlink = DOKU_URL;
499    } else {
500        $xlink = DOKU_BASE;
501    }
502
503    if($conf['userewrite'] == 2) {
504        $xlink .= DOKU_SCRIPT.'/'.$id;
505        if($urlParameters) $xlink .= '?'.$urlParameters;
506    } elseif($conf['userewrite']) {
507        $xlink .= $id;
508        if($urlParameters) $xlink .= '?'.$urlParameters;
509    } elseif($id !== '') {
510        $xlink .= DOKU_SCRIPT.'?id='.$id;
511        if($urlParameters) $xlink .= $separator.$urlParameters;
512    } else {
513        $xlink .= DOKU_SCRIPT;
514        if($urlParameters) $xlink .= '?'.$urlParameters;
515    }
516
517    return $xlink;
518}
519
520/**
521 * This builds a link to an alternate page format
522 *
523 * Handles URL rewriting if enabled. Follows the style of wl().
524 *
525 * @author Ben Coburn <btcoburn@silicodon.net>
526 * @param string       $id             page id, defaults to start page
527 * @param string       $format         the export renderer to use
528 * @param string|array $urlParameters  URL parameters, associative array recommended
529 * @param bool         $abs            request an absolute URL instead of relative
530 * @param string       $sep            parameter separator
531 * @return string
532 */
533function exportlink($id = '', $format = 'raw', $urlParameters = '', $abs = false, $sep = '&amp;') {
534    global $conf;
535    if(is_array($urlParameters)) {
536        $urlParameters = buildURLparams($urlParameters, $sep);
537    } else {
538        $urlParameters = str_replace(',', $sep, $urlParameters);
539    }
540
541    $format = rawurlencode($format);
542    $id     = idfilter($id);
543    if($abs) {
544        $xlink = DOKU_URL;
545    } else {
546        $xlink = DOKU_BASE;
547    }
548
549    if($conf['userewrite'] == 2) {
550        $xlink .= DOKU_SCRIPT.'/'.$id.'?do=export_'.$format;
551        if($urlParameters) $xlink .= $sep.$urlParameters;
552    } elseif($conf['userewrite'] == 1) {
553        $xlink .= '_export/'.$format.'/'.$id;
554        if($urlParameters) $xlink .= '?'.$urlParameters;
555    } else {
556        $xlink .= DOKU_SCRIPT.'?do=export_'.$format.$sep.'id='.$id;
557        if($urlParameters) $xlink .= $sep.$urlParameters;
558    }
559
560    return $xlink;
561}
562
563/**
564 * Build a link to a media file
565 *
566 * Will return a link to the detail page if $direct is false
567 *
568 * The $more parameter should always be given as array, the function then
569 * will strip default parameters to produce even cleaner URLs
570 *
571 * @param string  $id     the media file id or URL
572 * @param mixed   $more   string or array with additional parameters
573 * @param bool    $direct link to detail page if false
574 * @param string  $sep    URL parameter separator
575 * @param bool    $abs    Create an absolute URL
576 * @return string
577 */
578function ml($id = '', $more = '', $direct = true, $sep = '&amp;', $abs = false) {
579    global $conf;
580    $isexternalimage = media_isexternal($id);
581    if(!$isexternalimage) {
582        $id = cleanID($id);
583    }
584
585    if(is_array($more)) {
586        // add token for resized images
587        if(!empty($more['w']) || !empty($more['h']) || $isexternalimage){
588            $more['tok'] = media_get_token($id,$more['w'],$more['h']);
589        }
590        // strip defaults for shorter URLs
591        if(isset($more['cache']) && $more['cache'] == 'cache') unset($more['cache']);
592        if(empty($more['w'])) unset($more['w']);
593        if(empty($more['h'])) unset($more['h']);
594        if(isset($more['id']) && $direct) unset($more['id']);
595        if(isset($more['rev']) && !$more['rev']) unset($more['rev']);
596        $more = buildURLparams($more, $sep);
597    } else {
598        $matches = array();
599        if (preg_match_all('/\b(w|h)=(\d*)\b/',$more,$matches,PREG_SET_ORDER) || $isexternalimage){
600            $resize = array('w'=>0, 'h'=>0);
601            foreach ($matches as $match){
602                $resize[$match[1]] = $match[2];
603            }
604            $more .= $more === '' ? '' : $sep;
605            $more .= 'tok='.media_get_token($id,$resize['w'],$resize['h']);
606        }
607        $more = str_replace('cache=cache', '', $more); //skip default
608        $more = str_replace(',,', ',', $more);
609        $more = str_replace(',', $sep, $more);
610    }
611
612    if($abs) {
613        $xlink = DOKU_URL;
614    } else {
615        $xlink = DOKU_BASE;
616    }
617
618    // external URLs are always direct without rewriting
619    if($isexternalimage) {
620        $xlink .= 'lib/exe/fetch.php';
621        $xlink .= '?'.$more;
622        $xlink .= $sep.'media='.rawurlencode($id);
623        return $xlink;
624    }
625
626    $id = idfilter($id);
627
628    // decide on scriptname
629    if($direct) {
630        if($conf['userewrite'] == 1) {
631            $script = '_media';
632        } else {
633            $script = 'lib/exe/fetch.php';
634        }
635    } else {
636        if($conf['userewrite'] == 1) {
637            $script = '_detail';
638        } else {
639            $script = 'lib/exe/detail.php';
640        }
641    }
642
643    // build URL based on rewrite mode
644    if($conf['userewrite']) {
645        $xlink .= $script.'/'.$id;
646        if($more) $xlink .= '?'.$more;
647    } else {
648        if($more) {
649            $xlink .= $script.'?'.$more;
650            $xlink .= $sep.'media='.$id;
651        } else {
652            $xlink .= $script.'?media='.$id;
653        }
654    }
655
656    return $xlink;
657}
658
659/**
660 * Returns the URL to the DokuWiki base script
661 *
662 * Consider using wl() instead, unless you absoutely need the doku.php endpoint
663 *
664 * @author Andreas Gohr <andi@splitbrain.org>
665 *
666 * @return string
667 */
668function script() {
669    return DOKU_BASE.DOKU_SCRIPT;
670}
671
672/**
673 * Spamcheck against wordlist
674 *
675 * Checks the wikitext against a list of blocked expressions
676 * returns true if the text contains any bad words
677 *
678 * Triggers COMMON_WORDBLOCK_BLOCKED
679 *
680 *  Action Plugins can use this event to inspect the blocked data
681 *  and gain information about the user who was blocked.
682 *
683 *  Event data:
684 *    data['matches']  - array of matches
685 *    data['userinfo'] - information about the blocked user
686 *      [ip]           - ip address
687 *      [user]         - username (if logged in)
688 *      [mail]         - mail address (if logged in)
689 *      [name]         - real name (if logged in)
690 *
691 * @author Andreas Gohr <andi@splitbrain.org>
692 * @author Michael Klier <chi@chimeric.de>
693 *
694 * @param  string $text - optional text to check, if not given the globals are used
695 * @return bool         - true if a spam word was found
696 */
697function checkwordblock($text = '') {
698    global $TEXT;
699    global $PRE;
700    global $SUF;
701    global $SUM;
702    global $conf;
703    global $INFO;
704    /* @var Input $INPUT */
705    global $INPUT;
706
707    if(!$conf['usewordblock']) return false;
708
709    if(!$text) $text = "$PRE $TEXT $SUF $SUM";
710
711    // we prepare the text a tiny bit to prevent spammers circumventing URL checks
712    $text = preg_replace('!(\b)(www\.[\w.:?\-;,]+?\.[\w.:?\-;,]+?[\w/\#~:.?+=&%@\!\-.:?\-;,]+?)([.:?\-;,]*[^\w/\#~:.?+=&%@\!\-.:?\-;,])!i', '\1http://\2 \2\3', $text);
713
714    $wordblocks = getWordblocks();
715    // how many lines to read at once (to work around some PCRE limits)
716    if(version_compare(phpversion(), '4.3.0', '<')) {
717        // old versions of PCRE define a maximum of parenthesises even if no
718        // backreferences are used - the maximum is 99
719        // this is very bad performancewise and may even be too high still
720        $chunksize = 40;
721    } else {
722        // read file in chunks of 200 - this should work around the
723        // MAX_PATTERN_SIZE in modern PCRE
724        $chunksize = 200;
725    }
726    while($blocks = array_splice($wordblocks, 0, $chunksize)) {
727        $re = array();
728        // build regexp from blocks
729        foreach($blocks as $block) {
730            $block = preg_replace('/#.*$/', '', $block);
731            $block = trim($block);
732            if(empty($block)) continue;
733            $re[] = $block;
734        }
735        if(count($re) && preg_match('#('.join('|', $re).')#si', $text, $matches)) {
736            // prepare event data
737            $data = array();
738            $data['matches']        = $matches;
739            $data['userinfo']['ip'] = $INPUT->server->str('REMOTE_ADDR');
740            if($INPUT->server->str('REMOTE_USER')) {
741                $data['userinfo']['user'] = $INPUT->server->str('REMOTE_USER');
742                $data['userinfo']['name'] = $INFO['userinfo']['name'];
743                $data['userinfo']['mail'] = $INFO['userinfo']['mail'];
744            }
745            $callback = function () {
746                return true;
747            };
748            return trigger_event('COMMON_WORDBLOCK_BLOCKED', $data, $callback, true);
749        }
750    }
751    return false;
752}
753
754/**
755 * Return the IP of the client
756 *
757 * Honours X-Forwarded-For and X-Real-IP Proxy Headers
758 *
759 * It returns a comma separated list of IPs if the above mentioned
760 * headers are set. If the single parameter is set, it tries to return
761 * a routable public address, prefering the ones suplied in the X
762 * headers
763 *
764 * @author Andreas Gohr <andi@splitbrain.org>
765 *
766 * @param  boolean $single If set only a single IP is returned
767 * @return string
768 */
769function clientIP($single = false) {
770    /* @var Input $INPUT */
771    global $INPUT;
772
773    $ip   = array();
774    $ip[] = $INPUT->server->str('REMOTE_ADDR');
775    if($INPUT->server->str('HTTP_X_FORWARDED_FOR')) {
776        $ip = array_merge($ip, explode(',', str_replace(' ', '', $INPUT->server->str('HTTP_X_FORWARDED_FOR'))));
777    }
778    if($INPUT->server->str('HTTP_X_REAL_IP')) {
779        $ip = array_merge($ip, explode(',', str_replace(' ', '', $INPUT->server->str('HTTP_X_REAL_IP'))));
780    }
781
782    // some IPv4/v6 regexps borrowed from Feyd
783    // see: http://forums.devnetwork.net/viewtopic.php?f=38&t=53479
784    $dec_octet   = '(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[0-9])';
785    $hex_digit   = '[A-Fa-f0-9]';
786    $h16         = "{$hex_digit}{1,4}";
787    $IPv4Address = "$dec_octet\\.$dec_octet\\.$dec_octet\\.$dec_octet";
788    $ls32        = "(?:$h16:$h16|$IPv4Address)";
789    $IPv6Address =
790        "(?:(?:{$IPv4Address})|(?:".
791            "(?:$h16:){6}$ls32".
792            "|::(?:$h16:){5}$ls32".
793            "|(?:$h16)?::(?:$h16:){4}$ls32".
794            "|(?:(?:$h16:){0,1}$h16)?::(?:$h16:){3}$ls32".
795            "|(?:(?:$h16:){0,2}$h16)?::(?:$h16:){2}$ls32".
796            "|(?:(?:$h16:){0,3}$h16)?::(?:$h16:){1}$ls32".
797            "|(?:(?:$h16:){0,4}$h16)?::$ls32".
798            "|(?:(?:$h16:){0,5}$h16)?::$h16".
799            "|(?:(?:$h16:){0,6}$h16)?::".
800            ")(?:\\/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))?)";
801
802    // remove any non-IP stuff
803    $cnt   = count($ip);
804    $match = array();
805    for($i = 0; $i < $cnt; $i++) {
806        if(preg_match("/^$IPv4Address$/", $ip[$i], $match) || preg_match("/^$IPv6Address$/", $ip[$i], $match)) {
807            $ip[$i] = $match[0];
808        } else {
809            $ip[$i] = '';
810        }
811        if(empty($ip[$i])) unset($ip[$i]);
812    }
813    $ip = array_values(array_unique($ip));
814    if(!$ip[0]) $ip[0] = '0.0.0.0'; // for some strange reason we don't have a IP
815
816    if(!$single) return join(',', $ip);
817
818    // decide which IP to use, trying to avoid local addresses
819    $ip = array_reverse($ip);
820    foreach($ip as $i) {
821        if(preg_match('/^(::1|[fF][eE]80:|127\.|10\.|192\.168\.|172\.((1[6-9])|(2[0-9])|(3[0-1]))\.)/', $i)) {
822            continue;
823        } else {
824            return $i;
825        }
826    }
827    // still here? just use the first (last) address
828    return $ip[0];
829}
830
831/**
832 * Check if the browser is on a mobile device
833 *
834 * Adapted from the example code at url below
835 *
836 * @link http://www.brainhandles.com/2007/10/15/detecting-mobile-browsers/#code
837 *
838 * @return bool if true, client is mobile browser; otherwise false
839 */
840function clientismobile() {
841    /* @var Input $INPUT */
842    global $INPUT;
843
844    if($INPUT->server->has('HTTP_X_WAP_PROFILE')) return true;
845
846    if(preg_match('/wap\.|\.wap/i', $INPUT->server->str('HTTP_ACCEPT'))) return true;
847
848    if(!$INPUT->server->has('HTTP_USER_AGENT')) return false;
849
850    $uamatches = 'midp|j2me|avantg|docomo|novarra|palmos|palmsource|240x320|opwv|chtml|pda|windows ce|mmp\/|blackberry|mib\/|symbian|wireless|nokia|hand|mobi|phone|cdm|up\.b|audio|SIE\-|SEC\-|samsung|HTC|mot\-|mitsu|sagem|sony|alcatel|lg|erics|vx|NEC|philips|mmm|xx|panasonic|sharp|wap|sch|rover|pocket|benq|java|pt|pg|vox|amoi|bird|compal|kg|voda|sany|kdd|dbt|sendo|sgh|gradi|jb|\d\d\di|moto';
851
852    if(preg_match("/$uamatches/i", $INPUT->server->str('HTTP_USER_AGENT'))) return true;
853
854    return false;
855}
856
857/**
858 * check if a given link is interwiki link
859 *
860 * @param string $link the link, e.g. "wiki>page"
861 * @return bool
862 */
863function link_isinterwiki($link){
864    if (preg_match('/^[a-zA-Z0-9\.]+>/u',$link)) return true;
865    return false;
866}
867
868/**
869 * Convert one or more comma separated IPs to hostnames
870 *
871 * If $conf['dnslookups'] is disabled it simply returns the input string
872 *
873 * @author Glen Harris <astfgl@iamnota.org>
874 *
875 * @param  string $ips comma separated list of IP addresses
876 * @return string a comma separated list of hostnames
877 */
878function gethostsbyaddrs($ips) {
879    global $conf;
880    if(!$conf['dnslookups']) return $ips;
881
882    $hosts = array();
883    $ips   = explode(',', $ips);
884
885    if(is_array($ips)) {
886        foreach($ips as $ip) {
887            $hosts[] = gethostbyaddr(trim($ip));
888        }
889        return join(',', $hosts);
890    } else {
891        return gethostbyaddr(trim($ips));
892    }
893}
894
895/**
896 * Checks if a given page is currently locked.
897 *
898 * removes stale lockfiles
899 *
900 * @author Andreas Gohr <andi@splitbrain.org>
901 *
902 * @param string $id page id
903 * @return bool page is locked?
904 */
905function checklock($id) {
906    global $conf;
907    /* @var Input $INPUT */
908    global $INPUT;
909
910    $lock = wikiLockFN($id);
911
912    //no lockfile
913    if(!file_exists($lock)) return false;
914
915    //lockfile expired
916    if((time() - filemtime($lock)) > $conf['locktime']) {
917        @unlink($lock);
918        return false;
919    }
920
921    //my own lock
922    @list($ip, $session) = explode("\n", io_readFile($lock));
923    if($ip == $INPUT->server->str('REMOTE_USER') || $ip == clientIP() || (session_id() && $session == session_id())) {
924        return false;
925    }
926
927    return $ip;
928}
929
930/**
931 * Lock a page for editing
932 *
933 * @author Andreas Gohr <andi@splitbrain.org>
934 *
935 * @param string $id page id to lock
936 */
937function lock($id) {
938    global $conf;
939    /* @var Input $INPUT */
940    global $INPUT;
941
942    if($conf['locktime'] == 0) {
943        return;
944    }
945
946    $lock = wikiLockFN($id);
947    if($INPUT->server->str('REMOTE_USER')) {
948        io_saveFile($lock, $INPUT->server->str('REMOTE_USER'));
949    } else {
950        io_saveFile($lock, clientIP()."\n".session_id());
951    }
952}
953
954/**
955 * Unlock a page if it was locked by the user
956 *
957 * @author Andreas Gohr <andi@splitbrain.org>
958 *
959 * @param string $id page id to unlock
960 * @return bool true if a lock was removed
961 */
962function unlock($id) {
963    /* @var Input $INPUT */
964    global $INPUT;
965
966    $lock = wikiLockFN($id);
967    if(file_exists($lock)) {
968        @list($ip, $session) = explode("\n", io_readFile($lock));
969        if($ip == $INPUT->server->str('REMOTE_USER') || $ip == clientIP() || $session == session_id()) {
970            @unlink($lock);
971            return true;
972        }
973    }
974    return false;
975}
976
977/**
978 * convert line ending to unix format
979 *
980 * also makes sure the given text is valid UTF-8
981 *
982 * @see    formText() for 2crlf conversion
983 * @author Andreas Gohr <andi@splitbrain.org>
984 *
985 * @param string $text
986 * @return string
987 */
988function cleanText($text) {
989    $text = preg_replace("/(\015\012)|(\015)/", "\012", $text);
990
991    // if the text is not valid UTF-8 we simply assume latin1
992    // this won't break any worse than it breaks with the wrong encoding
993    // but might actually fix the problem in many cases
994    if(!utf8_check($text)) $text = utf8_encode($text);
995
996    return $text;
997}
998
999/**
1000 * Prepares text for print in Webforms by encoding special chars.
1001 * It also converts line endings to Windows format which is
1002 * pseudo standard for webforms.
1003 *
1004 * @see    cleanText() for 2unix conversion
1005 * @author Andreas Gohr <andi@splitbrain.org>
1006 *
1007 * @param string $text
1008 * @return string
1009 */
1010function formText($text) {
1011    $text = str_replace("\012", "\015\012", $text);
1012    return htmlspecialchars($text);
1013}
1014
1015/**
1016 * Returns the specified local text in raw format
1017 *
1018 * @author Andreas Gohr <andi@splitbrain.org>
1019 *
1020 * @param string $id   page id
1021 * @param string $ext  extension of file being read, default 'txt'
1022 * @return string
1023 */
1024function rawLocale($id, $ext = 'txt') {
1025    return io_readFile(localeFN($id, $ext));
1026}
1027
1028/**
1029 * Returns the raw WikiText
1030 *
1031 * @author Andreas Gohr <andi@splitbrain.org>
1032 *
1033 * @param string $id   page id
1034 * @param string|int $rev  timestamp when a revision of wikitext is desired
1035 * @return string
1036 */
1037function rawWiki($id, $rev = '') {
1038    return io_readWikiPage(wikiFN($id, $rev), $id, $rev);
1039}
1040
1041/**
1042 * Returns the pagetemplate contents for the ID's namespace
1043 *
1044 * @triggers COMMON_PAGETPL_LOAD
1045 * @author Andreas Gohr <andi@splitbrain.org>
1046 *
1047 * @param string $id the id of the page to be created
1048 * @return string parsed pagetemplate content
1049 */
1050function pageTemplate($id) {
1051    global $conf;
1052
1053    if(is_array($id)) $id = $id[0];
1054
1055    // prepare initial event data
1056    $data = array(
1057        'id'        => $id, // the id of the page to be created
1058        'tpl'       => '', // the text used as template
1059        'tplfile'   => '', // the file above text was/should be loaded from
1060        'doreplace' => true // should wildcard replacements be done on the text?
1061    );
1062
1063    $evt = new Doku_Event('COMMON_PAGETPL_LOAD', $data);
1064    if($evt->advise_before(true)) {
1065        // the before event might have loaded the content already
1066        if(empty($data['tpl'])) {
1067            // if the before event did not set a template file, try to find one
1068            if(empty($data['tplfile'])) {
1069                $path = dirname(wikiFN($id));
1070                if(file_exists($path.'/_template.txt')) {
1071                    $data['tplfile'] = $path.'/_template.txt';
1072                } else {
1073                    // search upper namespaces for templates
1074                    $len = strlen(rtrim($conf['datadir'], '/'));
1075                    while(strlen($path) >= $len) {
1076                        if(file_exists($path.'/__template.txt')) {
1077                            $data['tplfile'] = $path.'/__template.txt';
1078                            break;
1079                        }
1080                        $path = substr($path, 0, strrpos($path, '/'));
1081                    }
1082                }
1083            }
1084            // load the content
1085            $data['tpl'] = io_readFile($data['tplfile']);
1086        }
1087        if($data['doreplace']) parsePageTemplate($data);
1088    }
1089    $evt->advise_after();
1090    unset($evt);
1091
1092    return $data['tpl'];
1093}
1094
1095/**
1096 * Performs common page template replacements
1097 * This works on data from COMMON_PAGETPL_LOAD
1098 *
1099 * @author Andreas Gohr <andi@splitbrain.org>
1100 *
1101 * @param array $data array with event data
1102 * @return string
1103 */
1104function parsePageTemplate(&$data) {
1105    /**
1106     * @var string $id        the id of the page to be created
1107     * @var string $tpl       the text used as template
1108     * @var string $tplfile   the file above text was/should be loaded from
1109     * @var bool   $doreplace should wildcard replacements be done on the text?
1110     */
1111    extract($data);
1112
1113    global $USERINFO;
1114    global $conf;
1115    /* @var Input $INPUT */
1116    global $INPUT;
1117
1118    // replace placeholders
1119    $file = noNS($id);
1120    $page = strtr($file, $conf['sepchar'], ' ');
1121
1122    $tpl = str_replace(
1123        array(
1124             '@ID@',
1125             '@NS@',
1126             '@CURNS@',
1127             '@!CURNS@',
1128             '@!!CURNS@',
1129             '@!CURNS!@',
1130             '@FILE@',
1131             '@!FILE@',
1132             '@!FILE!@',
1133             '@PAGE@',
1134             '@!PAGE@',
1135             '@!!PAGE@',
1136             '@!PAGE!@',
1137             '@USER@',
1138             '@NAME@',
1139             '@MAIL@',
1140             '@DATE@',
1141        ),
1142        array(
1143             $id,
1144             getNS($id),
1145             curNS($id),
1146             utf8_ucfirst(curNS($id)),
1147             utf8_ucwords(curNS($id)),
1148             utf8_strtoupper(curNS($id)),
1149             $file,
1150             utf8_ucfirst($file),
1151             utf8_strtoupper($file),
1152             $page,
1153             utf8_ucfirst($page),
1154             utf8_ucwords($page),
1155             utf8_strtoupper($page),
1156             $INPUT->server->str('REMOTE_USER'),
1157             $USERINFO['name'],
1158             $USERINFO['mail'],
1159             $conf['dformat'],
1160        ), $tpl
1161    );
1162
1163    // we need the callback to work around strftime's char limit
1164    $tpl = preg_replace_callback(
1165        '/%./',
1166        function ($m) {
1167            return strftime($m[0]);
1168        },
1169        $tpl
1170    );
1171    $data['tpl'] = $tpl;
1172    return $tpl;
1173}
1174
1175/**
1176 * Returns the raw Wiki Text in three slices.
1177 *
1178 * The range parameter needs to have the form "from-to"
1179 * and gives the range of the section in bytes - no
1180 * UTF-8 awareness is needed.
1181 * The returned order is prefix, section and suffix.
1182 *
1183 * @author Andreas Gohr <andi@splitbrain.org>
1184 *
1185 * @param string $range in form "from-to"
1186 * @param string $id    page id
1187 * @param string $rev   optional, the revision timestamp
1188 * @return string[] with three slices
1189 */
1190function rawWikiSlices($range, $id, $rev = '') {
1191    $text = io_readWikiPage(wikiFN($id, $rev), $id, $rev);
1192
1193    // Parse range
1194    list($from, $to) = explode('-', $range, 2);
1195    // Make range zero-based, use defaults if marker is missing
1196    $from = !$from ? 0 : ($from - 1);
1197    $to   = !$to ? strlen($text) : ($to - 1);
1198
1199    $slices = array();
1200    $slices[0] = substr($text, 0, $from);
1201    $slices[1] = substr($text, $from, $to - $from);
1202    $slices[2] = substr($text, $to);
1203    return $slices;
1204}
1205
1206/**
1207 * Joins wiki text slices
1208 *
1209 * function to join the text slices.
1210 * When the pretty parameter is set to true it adds additional empty
1211 * lines between sections if needed (used on saving).
1212 *
1213 * @author Andreas Gohr <andi@splitbrain.org>
1214 *
1215 * @param string $pre   prefix
1216 * @param string $text  text in the middle
1217 * @param string $suf   suffix
1218 * @param bool $pretty add additional empty lines between sections
1219 * @return string
1220 */
1221function con($pre, $text, $suf, $pretty = false) {
1222    if($pretty) {
1223        if($pre !== '' && substr($pre, -1) !== "\n" &&
1224            substr($text, 0, 1) !== "\n"
1225        ) {
1226            $pre .= "\n";
1227        }
1228        if($suf !== '' && substr($text, -1) !== "\n" &&
1229            substr($suf, 0, 1) !== "\n"
1230        ) {
1231            $text .= "\n";
1232        }
1233    }
1234
1235    return $pre.$text.$suf;
1236}
1237
1238/**
1239 * Checks if the current page version is newer than the last entry in the page's
1240 * changelog. If so, we assume it has been an external edit and we create an
1241 * attic copy and add a proper changelog line.
1242 *
1243 * This check is only executed when the page is about to be saved again from the
1244 * wiki, triggered in @see saveWikiText()
1245 *
1246 * @param string $id the page ID
1247 */
1248function detectExternalEdit($id) {
1249    global $lang;
1250
1251    $fileLastMod = wikiFN($id);
1252    $lastMod     = @filemtime($fileLastMod); // from page
1253    $pagelog     = new PageChangeLog($id, 1024);
1254    $lastRev     = $pagelog->getRevisions(-1, 1); // from changelog
1255    $lastRev     = (int) (empty($lastRev) ? 0 : $lastRev[0]);
1256
1257    if(!file_exists(wikiFN($id, $lastMod)) && file_exists($fileLastMod) && $lastMod >= $lastRev) {
1258        // add old revision to the attic if missing
1259        saveOldRevision($id);
1260        // add a changelog entry if this edit came from outside dokuwiki
1261        if($lastMod > $lastRev) {
1262            $fileLastRev = wikiFN($id, $lastRev);
1263            $revinfo = $pagelog->getRevisionInfo($lastRev);
1264            if(empty($lastRev) || !file_exists($fileLastRev) || $revinfo['type'] == DOKU_CHANGE_TYPE_DELETE) {
1265                $filesize_old = 0;
1266            } else {
1267                $filesize_old = io_getSizeFile($fileLastRev);
1268            }
1269            $filesize_new = filesize($fileLastMod);
1270            $sizechange = $filesize_new - $filesize_old;
1271
1272            addLogEntry($lastMod, $id, DOKU_CHANGE_TYPE_EDIT, $lang['external_edit'], '', array('ExternalEdit'=> true), $sizechange);
1273            // remove soon to be stale instructions
1274            $cache = new cache_instructions($id, $fileLastMod);
1275            $cache->removeCache();
1276        }
1277    }
1278}
1279
1280/**
1281 * Saves a wikitext by calling io_writeWikiPage.
1282 * Also directs changelog and attic updates.
1283 *
1284 * @author Andreas Gohr <andi@splitbrain.org>
1285 * @author Ben Coburn <btcoburn@silicodon.net>
1286 *
1287 * @param string $id       page id
1288 * @param string $text     wikitext being saved
1289 * @param string $summary  summary of text update
1290 * @param bool   $minor    mark this saved version as minor update
1291 */
1292function saveWikiText($id, $text, $summary, $minor = false) {
1293    /* Note to developers:
1294       This code is subtle and delicate. Test the behavior of
1295       the attic and changelog with dokuwiki and external edits
1296       after any changes. External edits change the wiki page
1297       directly without using php or dokuwiki.
1298     */
1299    global $conf;
1300    global $lang;
1301    global $REV;
1302    /* @var Input $INPUT */
1303    global $INPUT;
1304
1305    // prepare data for event
1306    $svdta = array();
1307    $svdta['id']             = $id;
1308    $svdta['file']           = wikiFN($id);
1309    $svdta['revertFrom']     = $REV;
1310    $svdta['oldRevision']    = @filemtime($svdta['file']);
1311    $svdta['newRevision']    = 0;
1312    $svdta['newContent']     = $text;
1313    $svdta['oldContent']     = rawWiki($id);
1314    $svdta['summary']        = $summary;
1315    $svdta['contentChanged'] = ($svdta['newContent'] != $svdta['oldContent']);
1316    $svdta['changeInfo']     = '';
1317    $svdta['changeType']     = DOKU_CHANGE_TYPE_EDIT;
1318    $svdta['sizechange']     = null;
1319
1320    // select changelog line type
1321    if($REV) {
1322        $svdta['changeType']  = DOKU_CHANGE_TYPE_REVERT;
1323        $svdta['changeInfo'] = $REV;
1324    } else if(!file_exists($svdta['file'])) {
1325        $svdta['changeType'] = DOKU_CHANGE_TYPE_CREATE;
1326    } else if(trim($text) == '') {
1327        // empty or whitespace only content deletes
1328        $svdta['changeType'] = DOKU_CHANGE_TYPE_DELETE;
1329        // autoset summary on deletion
1330        if(blank($svdta['summary'])) {
1331            $svdta['summary'] = $lang['deleted'];
1332        }
1333    } else if($minor && $conf['useacl'] && $INPUT->server->str('REMOTE_USER')) {
1334        //minor edits only for logged in users
1335        $svdta['changeType'] = DOKU_CHANGE_TYPE_MINOR_EDIT;
1336    }
1337
1338    $event = new Doku_Event('COMMON_WIKIPAGE_SAVE', $svdta);
1339    if(!$event->advise_before()) return;
1340
1341    // if the content has not been changed, no save happens (plugins may override this)
1342    if(!$svdta['contentChanged']) return;
1343
1344    detectExternalEdit($id);
1345
1346    if(
1347        $svdta['changeType'] == DOKU_CHANGE_TYPE_CREATE ||
1348        ($svdta['changeType'] == DOKU_CHANGE_TYPE_REVERT && !file_exists($svdta['file']))
1349    ) {
1350        $filesize_old = 0;
1351    } else {
1352        $filesize_old = filesize($svdta['file']);
1353    }
1354    if($svdta['changeType'] == DOKU_CHANGE_TYPE_DELETE) {
1355        // Send "update" event with empty data, so plugins can react to page deletion
1356        $data = array(array($svdta['file'], '', false), getNS($id), noNS($id), false);
1357        trigger_event('IO_WIKIPAGE_WRITE', $data);
1358        // pre-save deleted revision
1359        @touch($svdta['file']);
1360        clearstatcache();
1361        $svdta['newRevision'] = saveOldRevision($id);
1362        // remove empty file
1363        @unlink($svdta['file']);
1364        $filesize_new = 0;
1365        // don't remove old meta info as it should be saved, plugins can use IO_WIKIPAGE_WRITE for removing their metadata...
1366        // purge non-persistant meta data
1367        p_purge_metadata($id);
1368        // remove empty namespaces
1369        io_sweepNS($id, 'datadir');
1370        io_sweepNS($id, 'mediadir');
1371    } else {
1372        // save file (namespace dir is created in io_writeWikiPage)
1373        io_writeWikiPage($svdta['file'], $svdta['newContent'], $id);
1374        // pre-save the revision, to keep the attic in sync
1375        $svdta['newRevision'] = saveOldRevision($id);
1376        $filesize_new = filesize($svdta['file']);
1377    }
1378    $svdta['sizechange'] = $filesize_new - $filesize_old;
1379
1380    $event->advise_after();
1381
1382    addLogEntry($svdta['newRevision'], $svdta['id'], $svdta['changeType'], $svdta['summary'], $svdta['changeInfo'], null, $svdta['sizechange']);
1383
1384    // send notify mails
1385    notify($svdta['id'], 'admin', $svdta['oldRevision'], $svdta['summary'], $minor);
1386    notify($svdta['id'], 'subscribers', $svdta['oldRevision'], $svdta['summary'], $minor);
1387
1388    // update the purgefile (timestamp of the last time anything within the wiki was changed)
1389    io_saveFile($conf['cachedir'].'/purgefile', time());
1390
1391    // if useheading is enabled, purge the cache of all linking pages
1392    if(useHeading('content')) {
1393        $pages = ft_backlinks($id, true);
1394        foreach($pages as $page) {
1395            $cache = new cache_renderer($page, wikiFN($page), 'xhtml');
1396            $cache->removeCache();
1397        }
1398    }
1399}
1400
1401/**
1402 * moves the current version to the attic and returns its
1403 * revision date
1404 *
1405 * @author Andreas Gohr <andi@splitbrain.org>
1406 *
1407 * @param string $id page id
1408 * @return int|string revision timestamp
1409 */
1410function saveOldRevision($id) {
1411    $oldf = wikiFN($id);
1412    if(!file_exists($oldf)) return '';
1413    $date = filemtime($oldf);
1414    $newf = wikiFN($id, $date);
1415    io_writeWikiPage($newf, rawWiki($id), $id, $date);
1416    return $date;
1417}
1418
1419/**
1420 * Sends a notify mail on page change or registration
1421 *
1422 * @param string     $id       The changed page
1423 * @param string     $who      Who to notify (admin|subscribers|register)
1424 * @param int|string $rev Old page revision
1425 * @param string     $summary  What changed
1426 * @param boolean    $minor    Is this a minor edit?
1427 * @param string[]   $replace  Additional string substitutions, @KEY@ to be replaced by value
1428 * @return bool
1429 *
1430 * @author Andreas Gohr <andi@splitbrain.org>
1431 */
1432function notify($id, $who, $rev = '', $summary = '', $minor = false, $replace = array()) {
1433    global $conf;
1434    /* @var Input $INPUT */
1435    global $INPUT;
1436
1437    // decide if there is something to do, eg. whom to mail
1438    if($who == 'admin') {
1439        if(empty($conf['notify'])) return false; //notify enabled?
1440        $tpl = 'mailtext';
1441        $to  = $conf['notify'];
1442    } elseif($who == 'subscribers') {
1443        if(!actionOK('subscribe')) return false; //subscribers enabled?
1444        if($conf['useacl'] && $INPUT->server->str('REMOTE_USER') && $minor) return false; //skip minors
1445        $data = array('id' => $id, 'addresslist' => '', 'self' => false, 'replacements' => $replace);
1446        trigger_event(
1447            'COMMON_NOTIFY_ADDRESSLIST', $data,
1448            array(new Subscription(), 'notifyaddresses')
1449        );
1450        $to = $data['addresslist'];
1451        if(empty($to)) return false;
1452        $tpl = 'subscr_single';
1453    } else {
1454        return false; //just to be safe
1455    }
1456
1457    // prepare content
1458    $subscription = new Subscription();
1459    return $subscription->send_diff($to, $tpl, $id, $rev, $summary);
1460}
1461
1462/**
1463 * extracts the query from a search engine referrer
1464 *
1465 * @author Andreas Gohr <andi@splitbrain.org>
1466 * @author Todd Augsburger <todd@rollerorgans.com>
1467 *
1468 * @return array|string
1469 */
1470function getGoogleQuery() {
1471    /* @var Input $INPUT */
1472    global $INPUT;
1473
1474    if(!$INPUT->server->has('HTTP_REFERER')) {
1475        return '';
1476    }
1477    $url = parse_url($INPUT->server->str('HTTP_REFERER'));
1478
1479    // only handle common SEs
1480    if(!preg_match('/(google|bing|yahoo|ask|duckduckgo|babylon|aol|yandex)/',$url['host'])) return '';
1481
1482    $query = array();
1483    // temporary workaround against PHP bug #49733
1484    // see http://bugs.php.net/bug.php?id=49733
1485    if(UTF8_MBSTRING) $enc = mb_internal_encoding();
1486    parse_str($url['query'], $query);
1487    if(UTF8_MBSTRING) mb_internal_encoding($enc);
1488
1489    $q = '';
1490    if(isset($query['q'])){
1491        $q = $query['q'];
1492    }elseif(isset($query['p'])){
1493        $q = $query['p'];
1494    }elseif(isset($query['query'])){
1495        $q = $query['query'];
1496    }
1497    $q = trim($q);
1498
1499    if(!$q) return '';
1500    $q = preg_split('/[\s\'"\\\\`()\]\[?:!\.{};,#+*<>\\/]+/', $q, -1, PREG_SPLIT_NO_EMPTY);
1501    return $q;
1502}
1503
1504/**
1505 * Return the human readable size of a file
1506 *
1507 * @param int $size A file size
1508 * @param int $dec A number of decimal places
1509 * @return string human readable size
1510 *
1511 * @author      Martin Benjamin <b.martin@cybernet.ch>
1512 * @author      Aidan Lister <aidan@php.net>
1513 * @version     1.0.0
1514 */
1515function filesize_h($size, $dec = 1) {
1516    $sizes = array('B', 'KB', 'MB', 'GB');
1517    $count = count($sizes);
1518    $i     = 0;
1519
1520    while($size >= 1024 && ($i < $count - 1)) {
1521        $size /= 1024;
1522        $i++;
1523    }
1524
1525    return round($size, $dec)."\xC2\xA0".$sizes[$i]; //non-breaking space
1526}
1527
1528/**
1529 * Return the given timestamp as human readable, fuzzy age
1530 *
1531 * @author Andreas Gohr <gohr@cosmocode.de>
1532 *
1533 * @param int $dt timestamp
1534 * @return string
1535 */
1536function datetime_h($dt) {
1537    global $lang;
1538
1539    $ago = time() - $dt;
1540    if($ago > 24 * 60 * 60 * 30 * 12 * 2) {
1541        return sprintf($lang['years'], round($ago / (24 * 60 * 60 * 30 * 12)));
1542    }
1543    if($ago > 24 * 60 * 60 * 30 * 2) {
1544        return sprintf($lang['months'], round($ago / (24 * 60 * 60 * 30)));
1545    }
1546    if($ago > 24 * 60 * 60 * 7 * 2) {
1547        return sprintf($lang['weeks'], round($ago / (24 * 60 * 60 * 7)));
1548    }
1549    if($ago > 24 * 60 * 60 * 2) {
1550        return sprintf($lang['days'], round($ago / (24 * 60 * 60)));
1551    }
1552    if($ago > 60 * 60 * 2) {
1553        return sprintf($lang['hours'], round($ago / (60 * 60)));
1554    }
1555    if($ago > 60 * 2) {
1556        return sprintf($lang['minutes'], round($ago / (60)));
1557    }
1558    return sprintf($lang['seconds'], $ago);
1559}
1560
1561/**
1562 * Wraps around strftime but provides support for fuzzy dates
1563 *
1564 * The format default to $conf['dformat']. It is passed to
1565 * strftime - %f can be used to get the value from datetime_h()
1566 *
1567 * @see datetime_h
1568 * @author Andreas Gohr <gohr@cosmocode.de>
1569 *
1570 * @param int|null $dt      timestamp when given, null will take current timestamp
1571 * @param string   $format  empty default to $conf['dformat'], or provide format as recognized by strftime()
1572 * @return string
1573 */
1574function dformat($dt = null, $format = '') {
1575    global $conf;
1576
1577    if(is_null($dt)) $dt = time();
1578    $dt = (int) $dt;
1579    if(!$format) $format = $conf['dformat'];
1580
1581    $format = str_replace('%f', datetime_h($dt), $format);
1582    return strftime($format, $dt);
1583}
1584
1585/**
1586 * Formats a timestamp as ISO 8601 date
1587 *
1588 * @author <ungu at terong dot com>
1589 * @link http://php.net/manual/en/function.date.php#54072
1590 *
1591 * @param int $int_date current date in UNIX timestamp
1592 * @return string
1593 */
1594function date_iso8601($int_date) {
1595    $date_mod     = date('Y-m-d\TH:i:s', $int_date);
1596    $pre_timezone = date('O', $int_date);
1597    $time_zone    = substr($pre_timezone, 0, 3).":".substr($pre_timezone, 3, 2);
1598    $date_mod .= $time_zone;
1599    return $date_mod;
1600}
1601
1602/**
1603 * return an obfuscated email address in line with $conf['mailguard'] setting
1604 *
1605 * @author Harry Fuecks <hfuecks@gmail.com>
1606 * @author Christopher Smith <chris@jalakai.co.uk>
1607 *
1608 * @param string $email email address
1609 * @return string
1610 */
1611function obfuscate($email) {
1612    global $conf;
1613
1614    switch($conf['mailguard']) {
1615        case 'visible' :
1616            $obfuscate = array('@' => ' [at] ', '.' => ' [dot] ', '-' => ' [dash] ');
1617            return strtr($email, $obfuscate);
1618
1619        case 'hex' :
1620            $encode = '';
1621            $len    = strlen($email);
1622            for($x = 0; $x < $len; $x++) {
1623                $encode .= '&#x'.bin2hex($email{$x}).';';
1624            }
1625            return $encode;
1626
1627        case 'none' :
1628        default :
1629            return $email;
1630    }
1631}
1632
1633/**
1634 * Removes quoting backslashes
1635 *
1636 * @author Andreas Gohr <andi@splitbrain.org>
1637 *
1638 * @param string $string
1639 * @param string $char backslashed character
1640 * @return string
1641 */
1642function unslash($string, $char = "'") {
1643    return str_replace('\\'.$char, $char, $string);
1644}
1645
1646/**
1647 * Convert php.ini shorthands to byte
1648 *
1649 * @author <gilthans dot NO dot SPAM at gmail dot com>
1650 * @link   http://php.net/manual/en/ini.core.php#79564
1651 *
1652 * @param string $v shorthands
1653 * @return int|string
1654 */
1655function php_to_byte($v) {
1656    $l   = substr($v, -1);
1657    $ret = substr($v, 0, -1);
1658    switch(strtoupper($l)) {
1659        /** @noinspection PhpMissingBreakStatementInspection */
1660        case 'P':
1661            $ret *= 1024;
1662        /** @noinspection PhpMissingBreakStatementInspection */
1663        case 'T':
1664            $ret *= 1024;
1665        /** @noinspection PhpMissingBreakStatementInspection */
1666        case 'G':
1667            $ret *= 1024;
1668        /** @noinspection PhpMissingBreakStatementInspection */
1669        case 'M':
1670            $ret *= 1024;
1671        /** @noinspection PhpMissingBreakStatementInspection */
1672        case 'K':
1673            $ret *= 1024;
1674            break;
1675        default;
1676            $ret *= 10;
1677            break;
1678    }
1679    return $ret;
1680}
1681
1682/**
1683 * Wrapper around preg_quote adding the default delimiter
1684 *
1685 * @param string $string
1686 * @return string
1687 */
1688function preg_quote_cb($string) {
1689    return preg_quote($string, '/');
1690}
1691
1692/**
1693 * Shorten a given string by removing data from the middle
1694 *
1695 * You can give the string in two parts, the first part $keep
1696 * will never be shortened. The second part $short will be cut
1697 * in the middle to shorten but only if at least $min chars are
1698 * left to display it. Otherwise it will be left off.
1699 *
1700 * @param string $keep   the part to keep
1701 * @param string $short  the part to shorten
1702 * @param int    $max    maximum chars you want for the whole string
1703 * @param int    $min    minimum number of chars to have left for middle shortening
1704 * @param string $char   the shortening character to use
1705 * @return string
1706 */
1707function shorten($keep, $short, $max, $min = 9, $char = '…') {
1708    $max = $max - utf8_strlen($keep);
1709    if($max < $min) return $keep;
1710    $len = utf8_strlen($short);
1711    if($len <= $max) return $keep.$short;
1712    $half = floor($max / 2);
1713    return $keep.utf8_substr($short, 0, $half - 1).$char.utf8_substr($short, $len - $half);
1714}
1715
1716/**
1717 * Return the users real name or e-mail address for use
1718 * in page footer and recent changes pages
1719 *
1720 * @param string|null $username or null when currently logged-in user should be used
1721 * @param bool $textonly true returns only plain text, true allows returning html
1722 * @return string html or plain text(not escaped) of formatted user name
1723 *
1724 * @author Andy Webber <dokuwiki AT andywebber DOT com>
1725 */
1726function editorinfo($username, $textonly = false) {
1727    return userlink($username, $textonly);
1728}
1729
1730/**
1731 * Returns users realname w/o link
1732 *
1733 * @param string|null $username or null when currently logged-in user should be used
1734 * @param bool $textonly true returns only plain text, true allows returning html
1735 * @return string html or plain text(not escaped) of formatted user name
1736 *
1737 * @triggers COMMON_USER_LINK
1738 */
1739function userlink($username = null, $textonly = false) {
1740    global $conf, $INFO;
1741    /** @var DokuWiki_Auth_Plugin $auth */
1742    global $auth;
1743    /** @var Input $INPUT */
1744    global $INPUT;
1745
1746    // prepare initial event data
1747    $data = array(
1748        'username' => $username, // the unique user name
1749        'name' => '',
1750        'link' => array( //setting 'link' to false disables linking
1751                         'target' => '',
1752                         'pre' => '',
1753                         'suf' => '',
1754                         'style' => '',
1755                         'more' => '',
1756                         'url' => '',
1757                         'title' => '',
1758                         'class' => ''
1759        ),
1760        'userlink' => '', // formatted user name as will be returned
1761        'textonly' => $textonly
1762    );
1763    if($username === null) {
1764        $data['username'] = $username = $INPUT->server->str('REMOTE_USER');
1765        if($textonly){
1766            $data['name'] = $INFO['userinfo']['name']. ' (' . $INPUT->server->str('REMOTE_USER') . ')';
1767        }else {
1768            $data['name'] = '<bdi>' . hsc($INFO['userinfo']['name']) . '</bdi> (<bdi>' . hsc($INPUT->server->str('REMOTE_USER')) . '</bdi>)';
1769        }
1770    }
1771
1772    $evt = new Doku_Event('COMMON_USER_LINK', $data);
1773    if($evt->advise_before(true)) {
1774        if(empty($data['name'])) {
1775            if($auth) $info = $auth->getUserData($username);
1776            if($conf['showuseras'] != 'loginname' && isset($info) && $info) {
1777                switch($conf['showuseras']) {
1778                    case 'username':
1779                    case 'username_link':
1780                        $data['name'] = $textonly ? $info['name'] : hsc($info['name']);
1781                        break;
1782                    case 'email':
1783                    case 'email_link':
1784                        $data['name'] = obfuscate($info['mail']);
1785                        break;
1786                }
1787            } else {
1788                $data['name'] = $textonly ? $data['username'] : hsc($data['username']);
1789            }
1790        }
1791
1792        /** @var Doku_Renderer_xhtml $xhtml_renderer */
1793        static $xhtml_renderer = null;
1794
1795        if(!$data['textonly'] && empty($data['link']['url'])) {
1796
1797            if(in_array($conf['showuseras'], array('email_link', 'username_link'))) {
1798                if(!isset($info)) {
1799                    if($auth) $info = $auth->getUserData($username);
1800                }
1801                if(isset($info) && $info) {
1802                    if($conf['showuseras'] == 'email_link') {
1803                        $data['link']['url'] = 'mailto:' . obfuscate($info['mail']);
1804                    } else {
1805                        if(is_null($xhtml_renderer)) {
1806                            $xhtml_renderer = p_get_renderer('xhtml');
1807                        }
1808                        if(empty($xhtml_renderer->interwiki)) {
1809                            $xhtml_renderer->interwiki = getInterwiki();
1810                        }
1811                        $shortcut = 'user';
1812                        $exists = null;
1813                        $data['link']['url'] = $xhtml_renderer->_resolveInterWiki($shortcut, $username, $exists);
1814                        $data['link']['class'] .= ' interwiki iw_user';
1815                        if($exists !== null) {
1816                            if($exists) {
1817                                $data['link']['class'] .= ' wikilink1';
1818                            } else {
1819                                $data['link']['class'] .= ' wikilink2';
1820                                $data['link']['rel'] = 'nofollow';
1821                            }
1822                        }
1823                    }
1824                } else {
1825                    $data['textonly'] = true;
1826                }
1827
1828            } else {
1829                $data['textonly'] = true;
1830            }
1831        }
1832
1833        if($data['textonly']) {
1834            $data['userlink'] = $data['name'];
1835        } else {
1836            $data['link']['name'] = $data['name'];
1837            if(is_null($xhtml_renderer)) {
1838                $xhtml_renderer = p_get_renderer('xhtml');
1839            }
1840            $data['userlink'] = $xhtml_renderer->_formatLink($data['link']);
1841        }
1842    }
1843    $evt->advise_after();
1844    unset($evt);
1845
1846    return $data['userlink'];
1847}
1848
1849/**
1850 * Returns the path to a image file for the currently chosen license.
1851 * When no image exists, returns an empty string
1852 *
1853 * @author Andreas Gohr <andi@splitbrain.org>
1854 *
1855 * @param  string $type - type of image 'badge' or 'button'
1856 * @return string
1857 */
1858function license_img($type) {
1859    global $license;
1860    global $conf;
1861    if(!$conf['license']) return '';
1862    if(!is_array($license[$conf['license']])) return '';
1863    $try   = array();
1864    $try[] = 'lib/images/license/'.$type.'/'.$conf['license'].'.png';
1865    $try[] = 'lib/images/license/'.$type.'/'.$conf['license'].'.gif';
1866    if(substr($conf['license'], 0, 3) == 'cc-') {
1867        $try[] = 'lib/images/license/'.$type.'/cc.png';
1868    }
1869    foreach($try as $src) {
1870        if(file_exists(DOKU_INC.$src)) return $src;
1871    }
1872    return '';
1873}
1874
1875/**
1876 * Checks if the given amount of memory is available
1877 *
1878 * If the memory_get_usage() function is not available the
1879 * function just assumes $bytes of already allocated memory
1880 *
1881 * @author Filip Oscadal <webmaster@illusionsoftworks.cz>
1882 * @author Andreas Gohr <andi@splitbrain.org>
1883 *
1884 * @param int  $mem    Size of memory you want to allocate in bytes
1885 * @param int  $bytes  already allocated memory (see above)
1886 * @return bool
1887 */
1888function is_mem_available($mem, $bytes = 1048576) {
1889    $limit = trim(ini_get('memory_limit'));
1890    if(empty($limit)) return true; // no limit set!
1891    if($limit == -1) return true; // unlimited
1892
1893    // parse limit to bytes
1894    $limit = php_to_byte($limit);
1895
1896    // get used memory if possible
1897    if(function_exists('memory_get_usage')) {
1898        $used = memory_get_usage();
1899    } else {
1900        $used = $bytes;
1901    }
1902
1903    if($used + $mem > $limit) {
1904        return false;
1905    }
1906
1907    return true;
1908}
1909
1910/**
1911 * Send a HTTP redirect to the browser
1912 *
1913 * Works arround Microsoft IIS cookie sending bug. Exits the script.
1914 *
1915 * @link   http://support.microsoft.com/kb/q176113/
1916 * @author Andreas Gohr <andi@splitbrain.org>
1917 *
1918 * @param string $url url being directed to
1919 */
1920function send_redirect($url) {
1921    $url = stripctl($url); // defend against HTTP Response Splitting
1922
1923    /* @var Input $INPUT */
1924    global $INPUT;
1925
1926    //are there any undisplayed messages? keep them in session for display
1927    global $MSG;
1928    if(isset($MSG) && count($MSG) && !defined('NOSESSION')) {
1929        //reopen session, store data and close session again
1930        @session_start();
1931        $_SESSION[DOKU_COOKIE]['msg'] = $MSG;
1932    }
1933
1934    // always close the session
1935    session_write_close();
1936
1937    // check if running on IIS < 6 with CGI-PHP
1938    if($INPUT->server->has('SERVER_SOFTWARE') && $INPUT->server->has('GATEWAY_INTERFACE') &&
1939        (strpos($INPUT->server->str('GATEWAY_INTERFACE'), 'CGI') !== false) &&
1940        (preg_match('|^Microsoft-IIS/(\d)\.\d$|', trim($INPUT->server->str('SERVER_SOFTWARE')), $matches)) &&
1941        $matches[1] < 6
1942    ) {
1943        header('Refresh: 0;url='.$url);
1944    } else {
1945        header('Location: '.$url);
1946    }
1947
1948    // no exits during unit tests
1949    if(defined('DOKU_UNITTEST')) {
1950        // pass info about the redirect back to the test suite
1951        $testRequest = TestRequest::getRunning();
1952        if($testRequest !== null) {
1953            $testRequest->addData('send_redirect', $url);
1954        }
1955        return;
1956    }
1957
1958    exit;
1959}
1960
1961/**
1962 * Validate a value using a set of valid values
1963 *
1964 * This function checks whether a specified value is set and in the array
1965 * $valid_values. If not, the function returns a default value or, if no
1966 * default is specified, throws an exception.
1967 *
1968 * @param string $param        The name of the parameter
1969 * @param array  $valid_values A set of valid values; Optionally a default may
1970 *                             be marked by the key “default”.
1971 * @param array  $array        The array containing the value (typically $_POST
1972 *                             or $_GET)
1973 * @param string $exc          The text of the raised exception
1974 *
1975 * @throws Exception
1976 * @return mixed
1977 * @author Adrian Lang <lang@cosmocode.de>
1978 */
1979function valid_input_set($param, $valid_values, $array, $exc = '') {
1980    if(isset($array[$param]) && in_array($array[$param], $valid_values)) {
1981        return $array[$param];
1982    } elseif(isset($valid_values['default'])) {
1983        return $valid_values['default'];
1984    } else {
1985        throw new Exception($exc);
1986    }
1987}
1988
1989/**
1990 * Read a preference from the DokuWiki cookie
1991 * (remembering both keys & values are urlencoded)
1992 *
1993 * @param string $pref     preference key
1994 * @param mixed  $default  value returned when preference not found
1995 * @return string preference value
1996 */
1997function get_doku_pref($pref, $default) {
1998    $enc_pref = urlencode($pref);
1999    if(isset($_COOKIE['DOKU_PREFS']) && strpos($_COOKIE['DOKU_PREFS'], $enc_pref) !== false) {
2000        $parts = explode('#', $_COOKIE['DOKU_PREFS']);
2001        $cnt   = count($parts);
2002
2003        // due to #2721 there might be duplicate entries,
2004        // so we read from the end
2005        for($i = $cnt-2; $i >= 0; $i -= 2) {
2006            if($parts[$i] == $enc_pref) {
2007                return urldecode($parts[$i + 1]);
2008            }
2009        }
2010    }
2011    return $default;
2012}
2013
2014/**
2015 * Add a preference to the DokuWiki cookie
2016 * (remembering $_COOKIE['DOKU_PREFS'] is urlencoded)
2017 * Remove it by setting $val to false
2018 *
2019 * @param string $pref  preference key
2020 * @param string $val   preference value
2021 */
2022function set_doku_pref($pref, $val) {
2023    global $conf;
2024    $orig = get_doku_pref($pref, false);
2025    $cookieVal = '';
2026
2027    if($orig !== false && ($orig !== $val)) {
2028        $parts = explode('#', $_COOKIE['DOKU_PREFS']);
2029        $cnt   = count($parts);
2030        // urlencode $pref for the comparison
2031        $enc_pref = rawurlencode($pref);
2032        $seen = false;
2033        for ($i = 0; $i < $cnt; $i += 2) {
2034            if ($parts[$i] == $enc_pref) {
2035                if (!$seen){
2036                    if ($val !== false) {
2037                        $parts[$i + 1] = rawurlencode($val);
2038                    } else {
2039                        unset($parts[$i]);
2040                        unset($parts[$i + 1]);
2041                    }
2042                    $seen = true;
2043                } else {
2044                    // no break because we want to remove duplicate entries
2045                    unset($parts[$i]);
2046                    unset($parts[$i + 1]);
2047                }
2048            }
2049        }
2050        $cookieVal = implode('#', $parts);
2051    } else if ($orig === false && $val !== false) {
2052        $cookieVal = ($_COOKIE['DOKU_PREFS'] ? $_COOKIE['DOKU_PREFS'].'#' : '').rawurlencode($pref).'#'.rawurlencode($val);
2053    }
2054
2055    $cookieDir = empty($conf['cookiedir']) ? DOKU_REL : $conf['cookiedir'];
2056    if(defined('DOKU_UNITTEST')) {
2057        $_COOKIE['DOKU_PREFS'] = $cookieVal;
2058    }else{
2059        setcookie('DOKU_PREFS', $cookieVal, time()+365*24*3600, $cookieDir, '', ($conf['securecookie'] && is_ssl()));
2060    }
2061}
2062
2063/**
2064 * Strips source mapping declarations from given text #601
2065 *
2066 * @param string &$text reference to the CSS or JavaScript code to clean
2067 */
2068function stripsourcemaps(&$text){
2069    $text = preg_replace('/^(\/\/|\/\*)[@#]\s+sourceMappingURL=.*?(\*\/)?$/im', '\\1\\2', $text);
2070}
2071
2072/**
2073 * Returns the contents of a given SVG file for embedding
2074 *
2075 * Inlining SVGs saves on HTTP requests and more importantly allows for styling them through
2076 * CSS. However it should used with small SVGs only. The $maxsize setting ensures only small
2077 * files are embedded.
2078 *
2079 * This strips unneeded headers, comments and newline. The result is not a vaild standalone SVG!
2080 *
2081 * @param string $file full path to the SVG file
2082 * @param int $maxsize maximum allowed size for the SVG to be embedded
2083 * @return string|false the SVG content, false if the file couldn't be loaded
2084 */
2085function inlineSVG($file, $maxsize = 2048) {
2086    $file = trim($file);
2087    if($file === '') return false;
2088    if(!file_exists($file)) return false;
2089    if(filesize($file) > $maxsize) return false;
2090    if(!is_readable($file)) return false;
2091    $content = file_get_contents($file);
2092    $content = preg_replace('/<!--.*?(-->)/s','', $content); // comments
2093    $content = preg_replace('/<\?xml .*?\?>/i', '', $content); // xml header
2094    $content = preg_replace('/<!DOCTYPE .*?>/i', '', $content); // doc type
2095    $content = preg_replace('/>\s+</s', '><', $content); // newlines between tags
2096    $content = trim($content);
2097    if(substr($content, 0, 5) !== '<svg ') return false;
2098    return $content;
2099}
2100
2101//Setup VIM: ex: et ts=2 :
2102