xref: /dokuwiki/inc/common.php (revision 9afe4dbf2e0907d016556ca89d08115ab99ab903) 
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      $ret = io_cacheParse($file);
510    }elseif($excuse){
511      $ret = parsedLocale('newpage');
512    }
513  }
514  return $ret;
515}
516
517/**
518 * Returns the raw WikiText
519 *
520 * @author Andreas Gohr <andi@splitbrain.org>
521 */
522function rawWiki($id,$rev=''){
523  return io_readFile(wikiFN($id,$rev));
524}
525
526/**
527 * Returns the raw Wiki Text in three slices.
528 *
529 * The range parameter needs to have the form "from-to"
530 * and gives the range of the section.
531 * The returned order is prefix, section and suffix.
532 *
533 * @author Andreas Gohr <andi@splitbrain.org>
534 */
535function rawWikiSlices($range,$id,$rev=''){
536  list($from,$to) = split('-',$range,2);
537  $text = io_readFile(wikiFN($id,$rev));
538  $text = split("\n",$text);
539  if(!$from) $from = 0;
540  if(!$to)   $to   = count($text);
541
542  $slices[0] = join("\n",array_slice($text,0,$from));
543  $slices[1] = join("\n",array_slice($text,$from,$to + 1  - $from));
544  $slices[2] = join("\n",array_slice($text,$to+1));
545
546  return $slices;
547}
548
549/**
550 * Joins wiki text slices
551 *
552 * function to join the text slices with correct lineendings again.
553 * When the pretty parameter is set to true it adds additional empty
554 * lines between sections if needed (used on saving).
555 *
556 * @author Andreas Gohr <andi@splitbrain.org>
557 */
558function con($pre,$text,$suf,$pretty=false){
559
560  if($pretty){
561    if($pre && substr($pre,-1) != "\n") $pre .= "\n";
562    if($suf && substr($text,-1) != "\n") $text .= "\n";
563  }
564
565  if($pre) $pre .= "\n";
566  if($suf) $text .= "\n";
567  return $pre.$text.$suf;
568}
569
570/**
571 * print debug messages
572 *
573 * little function to print the content of a var
574 *
575 * @author Andreas Gohr <andi@splitbrain.org>
576 */
577function dbg($msg,$hidden=false){
578  (!$hidden) ? print '<pre class="dbg">' : print "<!--\n";
579  print_r($msg);
580  (!$hidden) ? print '</pre>' : print "\n-->";
581}
582
583/**
584 * Add's an entry to the changelog
585 *
586 * @author Andreas Gohr <andi@splitbrain.org>
587 */
588function addLogEntry($date,$id,$summary=""){
589  global $conf;
590  $id     = cleanID($id);//FIXME not needed anymore?
591
592  if(!@is_writable($conf['changelog'])){
593    msg($conf['changelog'].' is not writable!',-1);
594    return;
595  }
596
597  if(!$date) $date = time(); //use current time if none supplied
598  $remote = $_SERVER['REMOTE_ADDR'];
599  $user   = $_SERVER['REMOTE_USER'];
600
601  $logline = join("\t",array($date,$remote,$id,$user,$summary))."\n";
602
603  //FIXME: use adjusted io_saveFile instead
604  $fh = fopen($conf['changelog'],'a');
605  if($fh){
606    fwrite($fh,$logline);
607    fclose($fh);
608  }
609}
610
611/**
612 * returns an array of recently changed files using the
613 * changelog
614 *
615 * @author Andreas Gohr <andi@splitbrain.org>
616 */
617function getRecents($num=0,$incdel=false){
618  global $conf;
619  $recent = array();
620  if(!$num) $num = $conf['recent'];
621
622  if(!@is_readable($conf['changelog'])){
623    msg($conf['changelog'].' is not readable',-1);
624    return $recent;
625  }
626
627  $loglines = file($conf['changelog']);
628  rsort($loglines); //reverse sort on timestamp
629
630  foreach ($loglines as $line){
631    $line = rtrim($line);        //remove newline
632    if(empty($line)) continue;   //skip empty lines
633    $info = split("\t",$line);   //split into parts
634    //add id if not in yet and file still exists and is allowed to read
635    if(!$recent[$info[2]] &&
636       (@file_exists(wikiFN($info[2])) || $incdel) &&
637       (auth_quickaclcheck($info[2]) >= AUTH_READ)
638      ){
639      $recent[$info[2]]['date'] = $info[0];
640      $recent[$info[2]]['ip']   = $info[1];
641      $recent[$info[2]]['user'] = $info[3];
642      $recent[$info[2]]['sum']  = $info[4];
643      $recent[$info[2]]['del']  = !@file_exists(wikiFN($info[2]));
644    }
645    if(count($recent) >= $num){
646      break; //finish if enough items found
647    }
648  }
649  return $recent;
650}
651
652/**
653 * gets additonal informations for a certain pagerevison
654 * from the changelog
655 *
656 * @author Andreas Gohr <andi@splitbrain.org>
657 */
658function getRevisionInfo($id,$rev){
659  global $conf;
660
661  if(!$rev) return(null);
662
663  $info = array();
664  if(!@is_readable($conf['changelog'])){
665    msg($conf['changelog'].' is not readable',-1);
666    return $recent;
667  }
668  $loglines = file($conf['changelog']);
669  $loglines = preg_grep("/$rev\t\d+\.\d+\.\d+\.\d+\t$id\t/",$loglines);
670  rsort($loglines); //reverse sort on timestamp (shouldn't be needed)
671  $line = split("\t",$loglines[0]);
672  $info['date'] = $line[0];
673  $info['ip']   = $line[1];
674  $info['user'] = $line[3];
675  $info['sum']   = $line[4];
676  return $info;
677}
678
679/**
680 * Saves a wikitext by calling io_saveFile
681 *
682 * @author Andreas Gohr <andi@splitbrain.org>
683 */
684function saveWikiText($id,$text,$summary){
685  global $conf;
686  global $lang;
687  umask($conf['umask']);
688  // ignore if no changes were made
689  if($text == rawWiki($id,'')){
690    return;
691  }
692
693  $file = wikiFN($id);
694  $old  = saveOldRevision($id);
695
696  if (empty($text)){
697    // remove empty files
698    @unlink($file);
699    $del = true;
700    //autoset summary on deletion
701    if(empty($summary)) $summary = $lang['deleted'];
702    //remove empty namespaces
703    io_sweepNS($id);
704  }else{
705    // save file (datadir is created in io_saveFile)
706    io_saveFile($file,$text);
707    $del = false;
708  }
709
710  addLogEntry(@filemtime($file),$id,$summary);
711  notify($id,$old,$summary);
712
713  //purge cache on add by updating the purgefile
714  if($conf['purgeonadd'] && (!$old || $del)){
715    io_saveFile($conf['datadir'].'/_cache/purgefile',time());
716  }
717}
718
719/**
720 * moves the current version to the attic and returns its
721 * revision date
722 *
723 * @author Andreas Gohr <andi@splitbrain.org>
724 */
725function saveOldRevision($id){
726	global $conf;
727  umask($conf['umask']);
728  $oldf = wikiFN($id);
729  if(!@file_exists($oldf)) return '';
730  $date = filemtime($oldf);
731  $newf = wikiFN($id,$date);
732  if(substr($newf,-3)=='.gz'){
733    io_saveFile($newf,rawWiki($id));
734  }else{
735    io_makeFileDir($newf);
736    copy($oldf, $newf);
737  }
738  return $date;
739}
740
741/**
742 * Sends a notify mail to the wikiadmin when a page was
743 * changed
744 *
745 * @author Andreas Gohr <andi@splitbrain.org>
746 */
747function notify($id,$rev="",$summary=""){
748  global $lang;
749  global $conf;
750  $hdrs ='';
751  if(empty($conf['notify'])) return; //notify enabled?
752
753  $text = rawLocale('mailtext');
754  $text = str_replace('@DATE@',date($conf['dformat']),$text);
755  $text = str_replace('@BROWSER@',$_SERVER['HTTP_USER_AGENT'],$text);
756  $text = str_replace('@IPADDRESS@',$_SERVER['REMOTE_ADDR'],$text);
757  $text = str_replace('@HOSTNAME@',gethostbyaddr($_SERVER['REMOTE_ADDR']),$text);
758  $text = str_replace('@NEWPAGE@',wl($id,'',true),$text);
759  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
760  $text = str_replace('@SUMMARY@',$summary,$text);
761  $text = str_replace('@USER@',$_SERVER['REMOTE_USER'],$text);
762
763  if($rev){
764    $subject = $lang['mail_changed'].' '.$id;
765    $text = str_replace('@OLDPAGE@',wl($id,"rev=$rev",true),$text);
766    require_once("inc/DifferenceEngine.php");
767    $df  = new Diff(split("\n",rawWiki($id,$rev)),
768                    split("\n",rawWiki($id)));
769    $dformat = new UnifiedDiffFormatter();
770    $diff    = $dformat->format($df);
771  }else{
772    $subject=$lang['mail_newpage'].' '.$id;
773    $text = str_replace('@OLDPAGE@','none',$text);
774    $diff = rawWiki($id);
775  }
776  $text = str_replace('@DIFF@',$diff,$text);
777
778  mail_send($conf['notify'],$subject,$text,$conf['mailfrom']);
779}
780
781/**
782 * Return a list of available page revisons
783 *
784 * @author Andreas Gohr <andi@splitbrain.org>
785 */
786function getRevisions($id){
787  $revd = dirname(wikiFN($id,'foo'));
788  $revs = array();
789  $clid = cleanID($id);
790  if(strrpos($clid,':')) $clid = substr($clid,strrpos($clid,':')+1); //remove path
791
792  if (is_dir($revd) && $dh = opendir($revd)) {
793    while (($file = readdir($dh)) !== false) {
794      if (is_dir($revd.'/'.$file)) continue;
795      if (preg_match('/^'.$clid.'\.(\d+)\.txt(\.gz)?$/',$file,$match)){
796        $revs[]=$match[1];
797      }
798    }
799    closedir($dh);
800  }
801  rsort($revs);
802  return $revs;
803}
804
805/**
806 * downloads a file from the net and saves it to the given location
807 *
808 * @author Andreas Gohr <andi@splitbrain.org>
809 */
810function download($url,$file){
811  $fp = @fopen($url,"rb");
812  if(!$fp) return false;
813
814  while(!feof($fp)){
815    $cont.= fread($fp,1024);
816  }
817  fclose($fp);
818
819  $fp2 = @fopen($file,"w");
820  if(!$fp2) return false;
821  fwrite($fp2,$cont);
822  fclose($fp2);
823  return true;
824}
825
826/**
827 * extracts the query from a google referer
828 *
829 * @todo   should be more generic and support yahoo et al
830 * @author Andreas Gohr <andi@splitbrain.org>
831 */
832function getGoogleQuery(){
833  $url = parse_url($_SERVER['HTTP_REFERER']);
834
835  if(!preg_match("#google\.#i",$url['host'])) return '';
836  $query = array();
837  parse_str($url['query'],$query);
838
839  return $query['q'];
840}
841
842/**
843 * Try to set correct locale
844 *
845 * @deprecated No longer used
846 * @author     Andreas Gohr <andi@splitbrain.org>
847 */
848function setCorrectLocale(){
849  global $conf;
850  global $lang;
851
852  $enc = strtoupper($lang['encoding']);
853  foreach ($lang['locales'] as $loc){
854    //try locale
855    if(@setlocale(LC_ALL,$loc)) return;
856    //try loceale with encoding
857    if(@setlocale(LC_ALL,"$loc.$enc")) return;
858  }
859  //still here? try to set from environment
860  @setlocale(LC_ALL,"");
861}
862
863/**
864 * Return the human readable size of a file
865 *
866 * @param       int    $size   A file size
867 * @param       int    $dec    A number of decimal places
868 * @author      Martin Benjamin <b.martin@cybernet.ch>
869 * @author      Aidan Lister <aidan@php.net>
870 * @version     1.0.0
871 */
872function filesize_h($size, $dec = 1){
873  $sizes = array('B', 'KB', 'MB', 'GB');
874  $count = count($sizes);
875  $i = 0;
876
877  while ($size >= 1024 && ($i < $count - 1)) {
878    $size /= 1024;
879    $i++;
880  }
881
882  return round($size, $dec) . ' ' . $sizes[$i];
883}
884
885/**
886 * Run a few sanity checks
887 *
888 * @author Andreas Gohr <andi@splitbrain.org>
889 */
890function getVersion(){
891  //import version string
892  if(@file_exists('VERSION')){
893    //official release
894    return 'Release '.io_readfile('VERSION');
895  }elseif(is_dir('_darcs')){
896    //darcs checkout
897    $inv = file('_darcs/inventory');
898    $inv = preg_grep('#andi@splitbrain\.org\*\*\d{14}#',$inv);
899    $cur = array_pop($inv);
900    preg_match('#\*\*(\d{4})(\d{2})(\d{2})#',$cur,$matches);
901    return 'Darcs '.$matches[1].'-'.$matches[2].'-'.$matches[3];
902  }else{
903    return 'snapshot?';
904  }
905}
906
907/**
908 * Run a few sanity checks
909 *
910 * @author Andreas Gohr <andi@splitbrain.org>
911 */
912function check(){
913  global $conf;
914  global $INFO;
915
916  msg('DokuWiki version: '.getVersion(),1);
917
918  if(version_compare(phpversion(),'4.3.0','<')){
919    msg('Your PHP version is too old ('.phpversion().' vs. 4.3.+ recommended)',-1);
920  }elseif(version_compare(phpversion(),'4.3.10','<')){
921    msg('Consider upgrading PHP to 4.3.10 or higher for security reasons (your version: '.phpversion().')',0);
922  }else{
923    msg('PHP version '.phpversion(),1);
924  }
925
926  if(is_writable($conf['changelog'])){
927    msg('Changelog is writable',1);
928  }else{
929    msg('Changelog is not writable',-1);
930  }
931
932  if(is_writable($conf['datadir'])){
933    msg('Datadir is writable',1);
934  }else{
935    msg('Datadir is not writable',-1);
936  }
937
938  if(is_writable($conf['olddir'])){
939    msg('Attic is writable',1);
940  }else{
941    msg('Attic is not writable',-1);
942  }
943
944  if(is_writable($conf['mediadir'])){
945    msg('Mediadir is writable',1);
946  }else{
947    msg('Mediadir is not writable',-1);
948  }
949
950  if(is_writable('conf/users.auth')){
951    msg('conf/users.auth is writable',1);
952  }else{
953    msg('conf/users.auth is not writable',0);
954  }
955
956  if(function_exists('mb_strpos')){
957    if(defined('UTF8_NOMBSTRING')){
958      msg('mb_string extension is available but will not be used',0);
959    }else{
960      msg('mb_string extension is available and will be used',1);
961    }
962  }else{
963    msg('mb_string extension not available - PHP only replacements will be used',0);
964  }
965
966  msg('Your current permission for this page is '.$INFO['perm'],0);
967
968  if(is_writable($INFO['filepath'])){
969    msg('The current page is writable by the webserver',0);
970  }else{
971    msg('The current page is not writable by the webserver',0);
972  }
973
974  if($INFO['writable']){
975    msg('The current page is writable by you',0);
976  }else{
977    msg('The current page is not writable you',0);
978  }
979}
980?>
981