xref: /dokuwiki/inc/common.php (revision 0cecf9d507451346a32ddf45a85b425784fbb0f8) 
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
9  if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../').'/');
10  require_once(DOKU_INC.'conf/dokuwiki.php');
11  require_once(DOKU_INC.'inc/io.php');
12  require_once(DOKU_INC.'inc/utf8.php');
13  require_once(DOKU_INC.'inc/mail.php');
14
15/**
16 * Return info about the current document as associative
17 * array.
18 *
19 * @author Andreas Gohr <andi@splitbrain.org>
20 */
21function pageinfo(){
22  global $ID;
23  global $REV;
24  global $USERINFO;
25  global $conf;
26
27  if($_SERVER['REMOTE_USER']){
28    $info['user']     = $_SERVER['REMOTE_USER'];
29    $info['userinfo'] = $USERINFO;
30    $info['perm']     = auth_quickaclcheck($ID);
31  }else{
32    $info['user']     = '';
33    $info['perm']     = auth_aclcheck($ID,'',null);
34  }
35
36  $info['namespace'] = getNS($ID);
37  $info['locked']    = checklock($ID);
38  $info['filepath']  = realpath(wikiFN($ID,$REV));
39  $info['exists']    = @file_exists($info['filepath']);
40  if($REV && !$info['exists']){
41    //check if current revision was meant
42    $cur = wikiFN($ID);
43    if(@file_exists($cur) && (@filemtime($cur) == $REV)){
44      $info['filepath'] = realpath($cur);
45      $info['exists']   = true;
46      $REV = '';
47    }
48  }
49  if($info['exists']){
50    $info['writable'] = (is_writable($info['filepath']) &&
51                         ($info['perm'] >= AUTH_EDIT));
52  }else{
53    $info['writable'] = ($info['perm'] >= AUTH_CREATE);
54  }
55  $info['editable']  = ($info['writable'] && empty($info['lock']));
56  $info['lastmod']   = @filemtime($info['filepath']);
57
58  //who's the editor
59  if($REV){
60    $revinfo = getRevisionInfo($ID,$REV);
61  }else{
62    $revinfo = getRevisionInfo($ID,$info['lastmod']);
63  }
64  $info['ip']     = $revinfo['ip'];
65  $info['user']   = $revinfo['user'];
66  $info['sum']    = $revinfo['sum'];
67  $info['editor'] = $revinfo['ip'];
68  if($revinfo['user']) $info['editor'].= ' ('.$revinfo['user'].')';
69
70  return $info;
71}
72
73/**
74 * print a message
75 *
76 * If HTTP headers were not sent yet the message is added
77 * to the global message array else it's printed directly
78 * using html_msgarea()
79 *
80 *
81 * Levels can be:
82 *
83 * -1 error
84 *  0 info
85 *  1 success
86 *
87 * @author Andreas Gohr <andi@splitbrain.org>
88 * @see    html_msgarea
89 */
90function msg($message,$lvl=0){
91  global $MSG;
92  $errors[-1] = 'error';
93  $errors[0]  = 'info';
94  $errors[1]  = 'success';
95
96  if(!headers_sent()){
97    if(!isset($MSG)) $MSG = array();
98    $MSG[]=array('lvl' => $errors[$lvl], 'msg' => $message);
99  }else{
100    $MSG = array();
101    $MSG[]=array('lvl' => $errors[$lvl], 'msg' => $message);
102    html_msgarea();
103  }
104}
105
106/**
107 * This builds the breadcrumb trail and returns it as array
108 *
109 * @author Andreas Gohr <andi@splitbrain.org>
110 */
111function breadcrumbs(){
112  global $ID;
113  global $ACT;
114  global $conf;
115  $crumbs = $_SESSION[$conf['title']]['bc'];
116
117  //first visit?
118  if (!is_array($crumbs)){
119    $crumbs = array();
120  }
121  //we only save on show and existing wiki documents
122  $file = wikiFN($ID);
123  if($ACT != 'show' || !@file_exists($file)){
124    $_SESSION[$conf['title']]['bc'] = $crumbs;
125    return $crumbs;
126  }
127
128  // page names
129  $name = noNS($ID);
130  if ($conf['useheading']) {
131    // get page title
132    $title = getFirstHeading(io_readFile($file));
133    if ($title) {
134      $name = $title;
135    }
136  }
137
138  //remove ID from array
139  if (isset($crumbs[$ID])) {
140    unset($crumbs[$ID]);
141  }
142
143  //add to array
144  $crumbs[$ID] = $name;
145  //reduce size
146  while(count($crumbs) > $conf['breadcrumbs']){
147    array_shift($crumbs);
148  }
149  //save to session
150  $_SESSION[$conf['title']]['bc'] = $crumbs;
151  return $crumbs;
152}
153
154/**
155 * Filter for page IDs
156 *
157 * This is run on a ID before it is outputted somewhere
158 * currently used to replace the colon with something else
159 * on Windows systems and to have proper URL encoding
160 *
161 * Urlencoding is ommitted when the second parameter is false
162 *
163 * @author Andreas Gohr <andi@splitbrain.org>
164 */
165function idfilter($id,$ue=true){
166  global $conf;
167  if ($conf['useslash'] && $conf['userewrite']){
168    $id = strtr($id,':','/');
169  }elseif (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' &&
170      $conf['userewrite']) {
171    $id = strtr($id,':',';');
172  }
173  if($ue){
174    $id = urlencode($id);
175    $id = str_replace('%3A',':',$id); //keep as colon
176    $id = str_replace('%2F','/',$id); //keep as slash
177  }
178  return $id;
179}
180
181/**
182 * This builds a link to a wikipage
183 *
184 * @author Andreas Gohr <andi@splitbrain.org>
185 */
186function wl($id='',$more='',$abs=false){
187  global $conf;
188  $more = str_replace(',','&amp;',$more);
189
190  $id    = idfilter($id);
191  if($abs){
192    $xlink = DOKU_URL;
193  }else{
194    $xlink = DOKU_BASE;
195  }
196
197  if(!$conf['userewrite']){
198    $xlink .= DOKU_SCRIPT.'?id='.$id;
199    if($more) $xlink .= '&amp;'.$more;
200  }else{
201    $xlink .= $id;
202    if($more) $xlink .= '?'.$more;
203  }
204
205  return $xlink;
206}
207
208/**
209 * Just builds a link to a script
210 *
211 * @todo   maybe obsolete
212 * @author Andreas Gohr <andi@splitbrain.org>
213 */
214function script($script='doku.php'){
215#  $link = getBaseURL();
216#  $link .= $script;
217#  return $link;
218  return DOKU_BASE.DOKU_SCRIPT;
219}
220
221/**
222 * Return namespacepart of a wiki ID
223 *
224 * @author Andreas Gohr <andi@splitbrain.org>
225 */
226function getNS($id){
227 if(strpos($id,':')!==false){
228   return substr($id,0,strrpos($id,':'));
229 }
230 return false;
231}
232
233/**
234 * Returns the ID without the namespace
235 *
236 * @author Andreas Gohr <andi@splitbrain.org>
237 */
238function noNS($id){
239  return preg_replace('/.*:/','',$id);
240}
241
242/**
243 * Spamcheck against wordlist
244 *
245 * Checks the wikitext against a list of blocked expressions
246 * returns true if the text contains any bad words
247 *
248 * @author Andreas Gohr <andi@splitbrain.org>
249 */
250function checkwordblock(){
251  global $TEXT;
252  global $conf;
253
254  if(!$conf['usewordblock']) return false;
255
256  $blockfile = file('conf/wordblock.conf');
257  //how many lines to read at once (to work around some PCRE limits)
258  if(version_compare(phpversion(),'4.3.0','<')){
259    //old versions of PCRE define a maximum of parenthesises even if no
260    //backreferences are used - the maximum is 99
261    //this is very bad performancewise and may even be too high still
262    $chunksize = 40;
263  }else{
264    //read file in chunks of 600 - this should work around the
265    //MAX_PATTERN_SIZE in modern PCRE
266    $chunksize = 600;
267  }
268  while($blocks = array_splice($blockfile,0,$chunksize)){
269    $re = array();
270    #build regexp from blocks
271    foreach($blocks as $block){
272      $block = preg_replace('/#.*$/','',$block);
273      $block = trim($block);
274      if(empty($block)) continue;
275      $re[]  = $block;
276    }
277    if(preg_match('#('.join('|',$re).')#si',$TEXT)) return true;
278  }
279  return false;
280}
281
282/**
283 * Return the IP of the client
284 *
285 * Honours X-Forwarded-For Proxy Headers
286 *
287 * @author Andreas Gohr <andi@splitbrain.org>
288 */
289function clientIP(){
290  $my = $_SERVER['REMOTE_ADDR'];
291  if($_SERVER['HTTP_X_FORWARDED_FOR']){
292    $my .= ' ('.$_SERVER['HTTP_X_FORWARDED_FOR'].')';
293  }
294  return $my;
295}
296
297/**
298 * Checks if a given page is currently locked.
299 *
300 * removes stale lockfiles
301 *
302 * @author Andreas Gohr <andi@splitbrain.org>
303 */
304function checklock($id){
305  global $conf;
306  $lock = wikiFN($id).'.lock';
307
308  //no lockfile
309  if(!@file_exists($lock)) return false;
310
311  //lockfile expired
312  if((time() - filemtime($lock)) > $conf['locktime']){
313    unlink($lock);
314    return false;
315  }
316
317  //my own lock
318  $ip = io_readFile($lock);
319  if( ($ip == clientIP()) || ($ip == $_SERVER['REMOTE_USER']) ){
320    return false;
321  }
322
323  return $ip;
324}
325
326/**
327 * Lock a page for editing
328 *
329 * @author Andreas Gohr <andi@splitbrain.org>
330 */
331function lock($id){
332  $lock = wikiFN($id).'.lock';
333  if($_SERVER['REMOTE_USER']){
334    io_saveFile($lock,$_SERVER['REMOTE_USER']);
335  }else{
336    io_saveFile($lock,clientIP());
337  }
338}
339
340/**
341 * Unlock a page if it was locked by the user
342 *
343 * @author Andreas Gohr <andi@splitbrain.org>
344 * @return bool true if a lock was removed
345 */
346function unlock($id){
347  $lock = wikiFN($id).'.lock';
348  if(@file_exists($lock)){
349    $ip = io_readFile($lock);
350    if( ($ip == clientIP()) || ($ip == $_SERVER['REMOTE_USER']) ){
351      @unlink($lock);
352      return true;
353    }
354  }
355  return false;
356}
357
358/**
359 * Remove unwanted chars from ID
360 *
361 * Cleans a given ID to only use allowed characters. Accented characters are
362 * converted to unaccented ones
363 *
364 * @author Andreas Gohr <andi@splitbrain.org>
365 */
366function cleanID($id){
367  global $conf;
368  global $lang;
369  $id = trim($id);
370  $id = utf8_strtolower($id);
371
372  //alternative namespace seperator
373  $id = strtr($id,';',':');
374  if($conf['useslash']){
375    $id = strtr($id,'/',':');
376  }else{
377    $id = strtr($id,'/','_');
378  }
379
380  if($conf['deaccent']) $id = utf8_deaccent($id,-1);
381
382  //remove specials
383  $id = utf8_stripspecials($id,'_','_:.-');
384
385  //clean up
386  $id = preg_replace('#__#','_',$id);
387  $id = preg_replace('#:+#',':',$id);
388  $id = trim($id,':._-');
389  $id = preg_replace('#:[:\._\-]+#',':',$id);
390
391  return($id);
392}
393
394/**
395 * returns the full path to the datafile specified by ID and
396 * optional revision
397 *
398 * The filename is URL encoded to protect Unicode chars
399 *
400 * @author Andreas Gohr <andi@splitbrain.org>
401 */
402function wikiFN($id,$rev=''){
403  global $conf;
404  $id = cleanID($id);
405  $id = str_replace(':','/',$id);
406  if(empty($rev)){
407    $fn = $conf['datadir'].'/'.utf8_encodeFN($id).'.txt';
408  }else{
409    $fn = $conf['olddir'].'/'.utf8_encodeFN($id).'.'.$rev.'.txt';
410    if($conf['usegzip'] && !@file_exists($fn)){
411      //return gzip if enabled and plaintext doesn't exist
412      $fn .= '.gz';
413    }
414  }
415  return $fn;
416}
417
418/**
419 * Returns the full filepath to a localized textfile if local
420 * version isn't found the english one is returned
421 *
422 * @author Andreas Gohr <andi@splitbrain.org>
423 */
424function localeFN($id){
425  global $conf;
426  $file = './lang/'.$conf['lang'].'/'.$id.'.txt';
427  if(!@file_exists($file)){
428    //fall back to english
429    $file = './lang/en/'.$id.'.txt';
430  }
431  return cleanText($file);
432}
433
434/**
435 * convert line ending to unix format
436 *
437 * @see    formText() for 2crlf conversion
438 * @author Andreas Gohr <andi@splitbrain.org>
439 */
440function cleanText($text){
441  $text = preg_replace("/(\015\012)|(\015)/","\012",$text);
442  return $text;
443}
444
445/**
446 * Prepares text for print in Webforms by encoding special chars.
447 * It also converts line endings to Windows format which is
448 * pseudo standard for webforms.
449 *
450 * @see    cleanText() for 2unix conversion
451 * @author Andreas Gohr <andi@splitbrain.org>
452 */
453function formText($text){
454  $text = preg_replace("/\012/","\015\012",$text);
455  return htmlspecialchars($text);
456}
457
458/**
459 * Returns the specified local text in parsed format
460 *
461 * @author Andreas Gohr <andi@splitbrain.org>
462 */
463function parsedLocale($id){
464  //disable section editing
465  global $parser;
466  $se = $parser['secedit'];
467  $parser['secedit'] = false;
468  //fetch parsed locale
469  $html = io_cacheParse(localeFN($id));
470  //reset section editing
471  $parser['secedit'] = $se;
472  return $html;
473}
474
475/**
476 * Returns the specified local text in raw format
477 *
478 * @author Andreas Gohr <andi@splitbrain.org>
479 */
480function rawLocale($id){
481  return io_readFile(localeFN($id));
482}
483
484
485/**
486 * Returns the parsed Wikitext for the given id and revision.
487 *
488 * If $excuse is true an explanation is returned if the file
489 * wasn't found
490 *
491 * @author Andreas Gohr <andi@splitbrain.org>
492 */
493function parsedWiki($id,$rev='',$excuse=true){
494  $file = wikiFN($id,$rev);
495  $ret  = '';
496
497  //ensure $id is in global $ID (needed for parsing)
498  global $ID;
499  $ID = $id;
500
501  if($rev){
502    if(@file_exists($file)){
503      $ret = parse(io_readFile($file));
504    }elseif($excuse){
505      $ret = parsedLocale('norev');
506    }
507  }else{
508    if(@file_exists($file)){
509      if(!defined('DOKU_USENEWPARSER')){
510        $ret = io_cacheParse($file);
511      }else{
512        msg('using new parser');
513        require_once(DOKU_INC.'inc/parser/action.php');
514        $ret = render_as_xhtml(parse_to_instructions(io_readFile($file)));
515      }
516    }elseif($excuse){
517      $ret = parsedLocale('newpage');
518    }
519  }
520
521  return $ret;
522}
523
524/**
525 * Returns the raw WikiText
526 *
527 * @author Andreas Gohr <andi@splitbrain.org>
528 */
529function rawWiki($id,$rev=''){
530  return io_readFile(wikiFN($id,$rev));
531}
532
533/**
534 * Returns the raw Wiki Text in three slices.
535 *
536 * The range parameter needs to have the form "from-to"
537 * and gives the range of the section.
538 * The returned order is prefix, section and suffix.
539 *
540 * @author Andreas Gohr <andi@splitbrain.org>
541 */
542function rawWikiSlices($range,$id,$rev=''){
543  list($from,$to) = split('-',$range,2);
544  $text = io_readFile(wikiFN($id,$rev));
545  $text = split("\n",$text);
546  if(!$from) $from = 0;
547  if(!$to)   $to   = count($text);
548
549  $slices[0] = join("\n",array_slice($text,0,$from));
550  $slices[1] = join("\n",array_slice($text,$from,$to + 1  - $from));
551  $slices[2] = join("\n",array_slice($text,$to+1));
552
553  return $slices;
554}
555
556/**
557 * Joins wiki text slices
558 *
559 * function to join the text slices with correct lineendings again.
560 * When the pretty parameter is set to true it adds additional empty
561 * lines between sections if needed (used on saving).
562 *
563 * @author Andreas Gohr <andi@splitbrain.org>
564 */
565function con($pre,$text,$suf,$pretty=false){
566
567  if($pretty){
568    if($pre && substr($pre,-1) != "\n") $pre .= "\n";
569    if($suf && substr($text,-1) != "\n") $text .= "\n";
570  }
571
572  if($pre) $pre .= "\n";
573  if($suf) $text .= "\n";
574  return $pre.$text.$suf;
575}
576
577/**
578 * print debug messages
579 *
580 * little function to print the content of a var
581 *
582 * @author Andreas Gohr <andi@splitbrain.org>
583 */
584function dbg($msg,$hidden=false){
585  (!$hidden) ? print '<pre class="dbg">' : print "<!--\n";
586  print_r($msg);
587  (!$hidden) ? print '</pre>' : print "\n-->";
588}
589
590/**
591 * Add's an entry to the changelog
592 *
593 * @author Andreas Gohr <andi@splitbrain.org>
594 */
595function addLogEntry($date,$id,$summary=""){
596  global $conf;
597  $id     = cleanID($id);//FIXME not needed anymore?
598
599  if(!@is_writable($conf['changelog'])){
600    msg($conf['changelog'].' is not writable!',-1);
601    return;
602  }
603
604  if(!$date) $date = time(); //use current time if none supplied
605  $remote = $_SERVER['REMOTE_ADDR'];
606  $user   = $_SERVER['REMOTE_USER'];
607
608  $logline = join("\t",array($date,$remote,$id,$user,$summary))."\n";
609
610  //FIXME: use adjusted io_saveFile instead
611  $fh = fopen($conf['changelog'],'a');
612  if($fh){
613    fwrite($fh,$logline);
614    fclose($fh);
615  }
616}
617
618/**
619 * returns an array of recently changed files using the
620 * changelog
621 *
622 * @author Andreas Gohr <andi@splitbrain.org>
623 */
624function getRecents($num=0,$incdel=false){
625  global $conf;
626  $recent = array();
627  if(!$num) $num = $conf['recent'];
628
629  if(!@is_readable($conf['changelog'])){
630    msg($conf['changelog'].' is not readable',-1);
631    return $recent;
632  }
633
634  $loglines = file($conf['changelog']);
635  rsort($loglines); //reverse sort on timestamp
636
637  foreach ($loglines as $line){
638    $line = rtrim($line);        //remove newline
639    if(empty($line)) continue;   //skip empty lines
640    $info = split("\t",$line);   //split into parts
641    //add id if not in yet and file still exists and is allowed to read
642    if(!$recent[$info[2]] &&
643       (@file_exists(wikiFN($info[2])) || $incdel) &&
644       (auth_quickaclcheck($info[2]) >= AUTH_READ)
645      ){
646      $recent[$info[2]]['date'] = $info[0];
647      $recent[$info[2]]['ip']   = $info[1];
648      $recent[$info[2]]['user'] = $info[3];
649      $recent[$info[2]]['sum']  = $info[4];
650      $recent[$info[2]]['del']  = !@file_exists(wikiFN($info[2]));
651    }
652    if(count($recent) >= $num){
653      break; //finish if enough items found
654    }
655  }
656  return $recent;
657}
658
659/**
660 * gets additonal informations for a certain pagerevison
661 * from the changelog
662 *
663 * @author Andreas Gohr <andi@splitbrain.org>
664 */
665function getRevisionInfo($id,$rev){
666  global $conf;
667
668  if(!$rev) return(null);
669
670  $info = array();
671  if(!@is_readable($conf['changelog'])){
672    msg($conf['changelog'].' is not readable',-1);
673    return $recent;
674  }
675  $loglines = file($conf['changelog']);
676  $loglines = preg_grep("/$rev\t\d+\.\d+\.\d+\.\d+\t$id\t/",$loglines);
677  rsort($loglines); //reverse sort on timestamp (shouldn't be needed)
678  $line = split("\t",$loglines[0]);
679  $info['date'] = $line[0];
680  $info['ip']   = $line[1];
681  $info['user'] = $line[3];
682  $info['sum']   = $line[4];
683  return $info;
684}
685
686/**
687 * Saves a wikitext by calling io_saveFile
688 *
689 * @author Andreas Gohr <andi@splitbrain.org>
690 */
691function saveWikiText($id,$text,$summary){
692  global $conf;
693  global $lang;
694  umask($conf['umask']);
695  // ignore if no changes were made
696  if($text == rawWiki($id,'')){
697    return;
698  }
699
700  $file = wikiFN($id);
701  $old  = saveOldRevision($id);
702
703  if (empty($text)){
704    // remove empty files
705    @unlink($file);
706    $del = true;
707    //autoset summary on deletion
708    if(empty($summary)) $summary = $lang['deleted'];
709    //remove empty namespaces
710    io_sweepNS($id);
711  }else{
712    // save file (datadir is created in io_saveFile)
713    io_saveFile($file,$text);
714    $del = false;
715  }
716
717  addLogEntry(@filemtime($file),$id,$summary);
718  notify($id,$old,$summary);
719
720  //purge cache on add by updating the purgefile
721  if($conf['purgeonadd'] && (!$old || $del)){
722    io_saveFile($conf['datadir'].'/_cache/purgefile',time());
723  }
724}
725
726/**
727 * moves the current version to the attic and returns its
728 * revision date
729 *
730 * @author Andreas Gohr <andi@splitbrain.org>
731 */
732function saveOldRevision($id){
733	global $conf;
734  umask($conf['umask']);
735  $oldf = wikiFN($id);
736  if(!@file_exists($oldf)) return '';
737  $date = filemtime($oldf);
738  $newf = wikiFN($id,$date);
739  if(substr($newf,-3)=='.gz'){
740    io_saveFile($newf,rawWiki($id));
741  }else{
742    io_makeFileDir($newf);
743    copy($oldf, $newf);
744  }
745  return $date;
746}
747
748/**
749 * Sends a notify mail to the wikiadmin when a page was
750 * changed
751 *
752 * @author Andreas Gohr <andi@splitbrain.org>
753 */
754function notify($id,$rev="",$summary=""){
755  global $lang;
756  global $conf;
757  $hdrs ='';
758  if(empty($conf['notify'])) return; //notify enabled?
759
760  $text = rawLocale('mailtext');
761  $text = str_replace('@DATE@',date($conf['dformat']),$text);
762  $text = str_replace('@BROWSER@',$_SERVER['HTTP_USER_AGENT'],$text);
763  $text = str_replace('@IPADDRESS@',$_SERVER['REMOTE_ADDR'],$text);
764  $text = str_replace('@HOSTNAME@',gethostbyaddr($_SERVER['REMOTE_ADDR']),$text);
765  $text = str_replace('@NEWPAGE@',wl($id,'',true),$text);
766  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
767  $text = str_replace('@SUMMARY@',$summary,$text);
768  $text = str_replace('@USER@',$_SERVER['REMOTE_USER'],$text);
769
770  if($rev){
771    $subject = $lang['mail_changed'].' '.$id;
772    $text = str_replace('@OLDPAGE@',wl($id,"rev=$rev",true),$text);
773    require_once("inc/DifferenceEngine.php");
774    $df  = new Diff(split("\n",rawWiki($id,$rev)),
775                    split("\n",rawWiki($id)));
776    $dformat = new UnifiedDiffFormatter();
777    $diff    = $dformat->format($df);
778  }else{
779    $subject=$lang['mail_newpage'].' '.$id;
780    $text = str_replace('@OLDPAGE@','none',$text);
781    $diff = rawWiki($id);
782  }
783  $text = str_replace('@DIFF@',$diff,$text);
784
785  mail_send($conf['notify'],$subject,$text,$conf['mailfrom']);
786}
787
788/**
789 * Return a list of available page revisons
790 *
791 * @author Andreas Gohr <andi@splitbrain.org>
792 */
793function getRevisions($id){
794  $revd = dirname(wikiFN($id,'foo'));
795  $revs = array();
796  $clid = cleanID($id);
797  if(strrpos($clid,':')) $clid = substr($clid,strrpos($clid,':')+1); //remove path
798
799  if (is_dir($revd) && $dh = opendir($revd)) {
800    while (($file = readdir($dh)) !== false) {
801      if (is_dir($revd.'/'.$file)) continue;
802      if (preg_match('/^'.$clid.'\.(\d+)\.txt(\.gz)?$/',$file,$match)){
803        $revs[]=$match[1];
804      }
805    }
806    closedir($dh);
807  }
808  rsort($revs);
809  return $revs;
810}
811
812/**
813 * downloads a file from the net and saves it to the given location
814 *
815 * @author Andreas Gohr <andi@splitbrain.org>
816 */
817function download($url,$file){
818  $fp = @fopen($url,"rb");
819  if(!$fp) return false;
820
821  while(!feof($fp)){
822    $cont.= fread($fp,1024);
823  }
824  fclose($fp);
825
826  $fp2 = @fopen($file,"w");
827  if(!$fp2) return false;
828  fwrite($fp2,$cont);
829  fclose($fp2);
830  return true;
831}
832
833/**
834 * extracts the query from a google referer
835 *
836 * @todo   should be more generic and support yahoo et al
837 * @author Andreas Gohr <andi@splitbrain.org>
838 */
839function getGoogleQuery(){
840  $url = parse_url($_SERVER['HTTP_REFERER']);
841
842  if(!preg_match("#google\.#i",$url['host'])) return '';
843  $query = array();
844  parse_str($url['query'],$query);
845
846  return $query['q'];
847}
848
849/**
850 * Try to set correct locale
851 *
852 * @deprecated No longer used
853 * @author     Andreas Gohr <andi@splitbrain.org>
854 */
855function setCorrectLocale(){
856  global $conf;
857  global $lang;
858
859  $enc = strtoupper($lang['encoding']);
860  foreach ($lang['locales'] as $loc){
861    //try locale
862    if(@setlocale(LC_ALL,$loc)) return;
863    //try loceale with encoding
864    if(@setlocale(LC_ALL,"$loc.$enc")) return;
865  }
866  //still here? try to set from environment
867  @setlocale(LC_ALL,"");
868}
869
870/**
871 * Return the human readable size of a file
872 *
873 * @param       int    $size   A file size
874 * @param       int    $dec    A number of decimal places
875 * @author      Martin Benjamin <b.martin@cybernet.ch>
876 * @author      Aidan Lister <aidan@php.net>
877 * @version     1.0.0
878 */
879function filesize_h($size, $dec = 1){
880  $sizes = array('B', 'KB', 'MB', 'GB');
881  $count = count($sizes);
882  $i = 0;
883
884  while ($size >= 1024 && ($i < $count - 1)) {
885    $size /= 1024;
886    $i++;
887  }
888
889  return round($size, $dec) . ' ' . $sizes[$i];
890}
891
892/**
893 * Run a few sanity checks
894 *
895 * @author Andreas Gohr <andi@splitbrain.org>
896 */
897function getVersion(){
898  //import version string
899  if(@file_exists('VERSION')){
900    //official release
901    return 'Release '.io_readfile('VERSION');
902  }elseif(is_dir('_darcs')){
903    //darcs checkout
904    $inv = file('_darcs/inventory');
905    $inv = preg_grep('#andi@splitbrain\.org\*\*\d{14}#',$inv);
906    $cur = array_pop($inv);
907    preg_match('#\*\*(\d{4})(\d{2})(\d{2})#',$cur,$matches);
908    return 'Darcs '.$matches[1].'-'.$matches[2].'-'.$matches[3];
909  }else{
910    return 'snapshot?';
911  }
912}
913
914/**
915 * Run a few sanity checks
916 *
917 * @author Andreas Gohr <andi@splitbrain.org>
918 */
919function check(){
920  global $conf;
921  global $INFO;
922
923  msg('DokuWiki version: '.getVersion(),1);
924
925  if(version_compare(phpversion(),'4.3.0','<')){
926    msg('Your PHP version is too old ('.phpversion().' vs. 4.3.+ recommended)',-1);
927  }elseif(version_compare(phpversion(),'4.3.10','<')){
928    msg('Consider upgrading PHP to 4.3.10 or higher for security reasons (your version: '.phpversion().')',0);
929  }else{
930    msg('PHP version '.phpversion(),1);
931  }
932
933  if(is_writable($conf['changelog'])){
934    msg('Changelog is writable',1);
935  }else{
936    msg('Changelog is not writable',-1);
937  }
938
939  if(is_writable($conf['datadir'])){
940    msg('Datadir is writable',1);
941  }else{
942    msg('Datadir is not writable',-1);
943  }
944
945  if(is_writable($conf['olddir'])){
946    msg('Attic is writable',1);
947  }else{
948    msg('Attic is not writable',-1);
949  }
950
951  if(is_writable($conf['mediadir'])){
952    msg('Mediadir is writable',1);
953  }else{
954    msg('Mediadir is not writable',-1);
955  }
956
957  if(is_writable('conf/users.auth')){
958    msg('conf/users.auth is writable',1);
959  }else{
960    msg('conf/users.auth is not writable',0);
961  }
962
963  if(function_exists('mb_strpos')){
964    if(defined('UTF8_NOMBSTRING')){
965      msg('mb_string extension is available but will not be used',0);
966    }else{
967      msg('mb_string extension is available and will be used',1);
968    }
969  }else{
970    msg('mb_string extension not available - PHP only replacements will be used',0);
971  }
972
973  msg('Your current permission for this page is '.$INFO['perm'],0);
974
975  if(is_writable($INFO['filepath'])){
976    msg('The current page is writable by the webserver',0);
977  }else{
978    msg('The current page is not writable by the webserver',0);
979  }
980
981  if($INFO['writable']){
982    msg('The current page is writable by you',0);
983  }else{
984    msg('The current page is not writable you',0);
985  }
986}
987?>
988