xref: /dokuwiki/inc/common.php (revision 53d6ccfe6aabe82c94115350d2f791f2e09d60d6) 
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    $crumbs = array();
120  }
121  //we only save on show and existing wiki documents
122  if($ACT != 'show' || !@file_exists(wikiFN($ID))){
123    $_SESSION[$conf['title']]['bc'] = $crumbs;
124    return $crumbs;
125  }
126  //remove ID from array
127  $pos = array_search($ID,$crumbs);
128  if($pos !== false && $pos !== null){
129    array_splice($crumbs,$pos,1);
130  }
131
132  //add to array
133  $crumbs[] =$ID;
134  //reduce size
135  while(count($crumbs) > $conf['breadcrumbs']){
136    array_shift($crumbs);
137  }
138  //save to session
139  $_SESSION[$conf['title']]['bc'] = $crumbs;
140  return $crumbs;
141}
142
143/**
144 * Filter for page IDs
145 *
146 * This is run on a ID before it is outputted somewhere
147 * currently used to replace the colon with something else
148 * on Windows systems and to have proper URL encoding
149 *
150 * Urlencoding is ommitted when the second parameter is false
151 *
152 * @author Andreas Gohr <andi@splitbrain.org>
153 */
154function idfilter($id,$ue=true){
155  global $conf;
156  if ($conf['useslash'] && $conf['userewrite']){
157    $id = strtr($id,':','/');
158  }elseif (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' &&
159      $conf['userewrite']) {
160    $id = strtr($id,':',';');
161  }
162  if($ue){
163    $id = urlencode($id);
164    $id = str_replace('%3A',':',$id); //keep as colon
165    $id = str_replace('%2F','/',$id); //keep as slash
166  }
167  return $id;
168}
169
170/**
171 * This builds a link to a wikipage
172 *
173 * @author Andreas Gohr <andi@splitbrain.org>
174 */
175function wl($id='',$more='',$abs=false){
176  global $conf;
177  $more = str_replace(',','&amp;',$more);
178
179  $id    = idfilter($id);
180  if($abs){
181    $xlink = DOKU_URL;
182  }else{
183    $xlink = DOKU_BASE;
184  }
185
186  if(!$conf['userewrite']){
187    $xlink .= DOKU_SCRIPT.'?id='.$id;
188    if($more) $xlink .= '&amp;'.$more;
189  }else{
190    $xlink .= $id;
191    if($more) $xlink .= '?'.$more;
192  }
193
194  return $xlink;
195}
196
197/**
198 * Just builds a link to a script
199 *
200 * @todo   maybe obsolete
201 * @author Andreas Gohr <andi@splitbrain.org>
202 */
203function script($script='doku.php'){
204#  $link = getBaseURL();
205#  $link .= $script;
206#  return $link;
207  return DOKU_BASE.DOKU_SCRIPT;
208}
209
210/**
211 * Return namespacepart of a wiki ID
212 *
213 * @author Andreas Gohr <andi@splitbrain.org>
214 */
215function getNS($id){
216 if(strpos($id,':')!==false){
217   return substr($id,0,strrpos($id,':'));
218 }
219 return false;
220}
221
222/**
223 * Returns the ID without the namespace
224 *
225 * @author Andreas Gohr <andi@splitbrain.org>
226 */
227function noNS($id){
228  return preg_replace('/.*:/','',$id);
229}
230
231/**
232 * Spamcheck against wordlist
233 *
234 * Checks the wikitext against a list of blocked expressions
235 * returns true if the text contains any bad words
236 *
237 * @author Andreas Gohr <andi@splitbrain.org>
238 */
239function checkwordblock(){
240  global $TEXT;
241  global $conf;
242
243  if(!$conf['usewordblock']) return false;
244
245  $blockfile = file('conf/wordblock.conf');
246  //how many lines to read at once (to work around some PCRE limits)
247  if(version_compare(phpversion(),'4.3.0','<')){
248    //old versions of PCRE define a maximum of parenthesises even if no
249    //backreferences are used - the maximum is 99
250    //this is very bad performancewise and may even be too high still
251    $chunksize = 40;
252  }else{
253    //read file in chunks of 600 - this should work around the
254    //MAX_PATTERN_SIZE in modern PCRE
255    $chunksize = 600;
256  }
257  while($blocks = array_splice($blockfile,0,$chunksize)){
258    $re = array();
259    #build regexp from blocks
260    foreach($blocks as $block){
261      $block = preg_replace('/#.*$/','',$block);
262      $block = trim($block);
263      if(empty($block)) continue;
264      $re[]  = $block;
265    }
266    if(preg_match('#('.join('|',$re).')#si',$TEXT)) return true;
267  }
268  return false;
269}
270
271/**
272 * Return the IP of the client
273 *
274 * Honours X-Forwarded-For Proxy Headers
275 *
276 * @author Andreas Gohr <andi@splitbrain.org>
277 */
278function clientIP(){
279  $my = $_SERVER['REMOTE_ADDR'];
280  if($_SERVER['HTTP_X_FORWARDED_FOR']){
281    $my .= ' ('.$_SERVER['HTTP_X_FORWARDED_FOR'].')';
282  }
283  return $my;
284}
285
286/**
287 * Checks if a given page is currently locked.
288 *
289 * removes stale lockfiles
290 *
291 * @author Andreas Gohr <andi@splitbrain.org>
292 */
293function checklock($id){
294  global $conf;
295  $lock = wikiFN($id).'.lock';
296
297  //no lockfile
298  if(!@file_exists($lock)) return false;
299
300  //lockfile expired
301  if((time() - filemtime($lock)) > $conf['locktime']){
302    unlink($lock);
303    return false;
304  }
305
306  //my own lock
307  $ip = io_readFile($lock);
308  if( ($ip == clientIP()) || ($ip == $_SERVER['REMOTE_USER']) ){
309    return false;
310  }
311
312  return $ip;
313}
314
315/**
316 * Lock a page for editing
317 *
318 * @author Andreas Gohr <andi@splitbrain.org>
319 */
320function lock($id){
321  $lock = wikiFN($id).'.lock';
322  if($_SERVER['REMOTE_USER']){
323    io_saveFile($lock,$_SERVER['REMOTE_USER']);
324  }else{
325    io_saveFile($lock,clientIP());
326  }
327}
328
329/**
330 * Unlock a page if it was locked by the user
331 *
332 * @author Andreas Gohr <andi@splitbrain.org>
333 * @return bool true if a lock was removed
334 */
335function unlock($id){
336  $lock = wikiFN($id).'.lock';
337  if(@file_exists($lock)){
338    $ip = io_readFile($lock);
339    if( ($ip == clientIP()) || ($ip == $_SERVER['REMOTE_USER']) ){
340      @unlink($lock);
341      return true;
342    }
343  }
344  return false;
345}
346
347/**
348 * Remove unwanted chars from ID
349 *
350 * Cleans a given ID to only use allowed characters. Accented characters are
351 * converted to unaccented ones
352 *
353 * @author Andreas Gohr <andi@splitbrain.org>
354 */
355function cleanID($id){
356  global $conf;
357  global $lang;
358  $id = trim($id);
359  $id = utf8_strtolower($id);
360
361  //alternative namespace seperator
362  $id = strtr($id,';',':');
363  if($conf['useslash']){
364    $id = strtr($id,'/',':');
365  }else{
366    $id = strtr($id,'/','_');
367  }
368
369  if($conf['deaccent']) $id = utf8_deaccent($id,-1);
370
371  //remove specials
372  $id = utf8_stripspecials($id,'_','_:.-');
373
374  //clean up
375  $id = preg_replace('#__#','_',$id);
376  $id = preg_replace('#:+#',':',$id);
377  $id = trim($id,':._-');
378  $id = preg_replace('#:[:\._\-]+#',':',$id);
379
380  return($id);
381}
382
383/**
384 * returns the full path to the datafile specified by ID and
385 * optional revision
386 *
387 * The filename is URL encoded to protect Unicode chars
388 *
389 * @author Andreas Gohr <andi@splitbrain.org>
390 */
391function wikiFN($id,$rev=''){
392  global $conf;
393  $id = cleanID($id);
394  $id = str_replace(':','/',$id);
395  if(empty($rev)){
396    $fn = $conf['datadir'].'/'.$id.'.txt';
397  }else{
398    $fn = $conf['olddir'].'/'.$id.'.'.$rev.'.txt';
399    if($conf['usegzip'] && !@file_exists($fn)){
400      //return gzip if enabled and plaintext doesn't exist
401      $fn .= '.gz';
402    }
403  }
404  $fn = utf8_encodeFN($fn);
405  return $fn;
406}
407
408/**
409 * Returns the full filepath to a localized textfile if local
410 * version isn't found the english one is returned
411 *
412 * @author Andreas Gohr <andi@splitbrain.org>
413 */
414function localeFN($id){
415  global $conf;
416  $file = './lang/'.$conf['lang'].'/'.$id.'.txt';
417  if(!@file_exists($file)){
418    //fall back to english
419    $file = './lang/en/'.$id.'.txt';
420  }
421  return cleanText($file);
422}
423
424/**
425 * convert line ending to unix format
426 *
427 * @see    formText() for 2crlf conversion
428 * @author Andreas Gohr <andi@splitbrain.org>
429 */
430function cleanText($text){
431  $text = preg_replace("/(\015\012)|(\015)/","\012",$text);
432  return $text;
433}
434
435/**
436 * Prepares text for print in Webforms by encoding special chars.
437 * It also converts line endings to Windows format which is
438 * pseudo standard for webforms.
439 *
440 * @see    cleanText() for 2unix conversion
441 * @author Andreas Gohr <andi@splitbrain.org>
442 */
443function formText($text){
444  $text = preg_replace("/\012/","\015\012",$text);
445  return htmlspecialchars($text);
446}
447
448/**
449 * Returns the specified local text in parsed format
450 *
451 * @author Andreas Gohr <andi@splitbrain.org>
452 */
453function parsedLocale($id){
454  //disable section editing
455  global $parser;
456  $se = $parser['secedit'];
457  $parser['secedit'] = false;
458  //fetch parsed locale
459  $html = io_cacheParse(localeFN($id));
460  //reset section editing
461  $parser['secedit'] = $se;
462  return $html;
463}
464
465/**
466 * Returns the specified local text in raw format
467 *
468 * @author Andreas Gohr <andi@splitbrain.org>
469 */
470function rawLocale($id){
471  return io_readFile(localeFN($id));
472}
473
474
475/**
476 * Returns the parsed Wikitext for the given id and revision.
477 *
478 * If $excuse is true an explanation is returned if the file
479 * wasn't found
480 *
481 * @author Andreas Gohr <andi@splitbrain.org>
482 */
483function parsedWiki($id,$rev='',$excuse=true){
484  $file = wikiFN($id,$rev);
485  $ret  = '';
486
487  //ensure $id is in global $ID (needed for parsing)
488  global $ID;
489  $ID = $id;
490
491  if($rev){
492    if(@file_exists($file)){
493      $ret = parse(io_readFile($file));
494    }elseif($excuse){
495      $ret = parsedLocale('norev');
496    }
497  }else{
498    if(@file_exists($file)){
499      $ret = io_cacheParse($file);
500    }elseif($excuse){
501      $ret = parsedLocale('newpage');
502    }
503  }
504  return $ret;
505}
506
507/**
508 * Returns the raw WikiText
509 *
510 * @author Andreas Gohr <andi@splitbrain.org>
511 */
512function rawWiki($id,$rev=''){
513  return io_readFile(wikiFN($id,$rev));
514}
515
516/**
517 * Returns the raw Wiki Text in three slices.
518 *
519 * The range parameter needs to have the form "from-to"
520 * and gives the range of the section.
521 * The returned order is prefix, section and suffix.
522 *
523 * @author Andreas Gohr <andi@splitbrain.org>
524 */
525function rawWikiSlices($range,$id,$rev=''){
526  list($from,$to) = split('-',$range,2);
527  $text = io_readFile(wikiFN($id,$rev));
528  $text = split("\n",$text);
529  if(!$from) $from = 0;
530  if(!$to)   $to   = count($text);
531
532  $slices[0] = join("\n",array_slice($text,0,$from));
533  $slices[1] = join("\n",array_slice($text,$from,$to + 1  - $from));
534  $slices[2] = join("\n",array_slice($text,$to+1));
535
536  return $slices;
537}
538
539/**
540 * Joins wiki text slices
541 *
542 * function to join the text slices with correct lineendings again.
543 * When the pretty parameter is set to true it adds additional empty
544 * lines between sections if needed (used on saving).
545 *
546 * @author Andreas Gohr <andi@splitbrain.org>
547 */
548function con($pre,$text,$suf,$pretty=false){
549
550  if($pretty){
551    if($pre && substr($pre,-1) != "\n") $pre .= "\n";
552    if($suf && substr($text,-1) != "\n") $text .= "\n";
553  }
554
555  if($pre) $pre .= "\n";
556  if($suf) $text .= "\n";
557  return $pre.$text.$suf;
558}
559
560/**
561 * print debug messages
562 *
563 * little function to print the content of a var
564 *
565 * @author Andreas Gohr <andi@splitbrain.org>
566 */
567function dbg($msg,$hidden=false){
568  (!$hidden) ? print '<pre class="dbg">' : print "<!--\n";
569  print_r($msg);
570  (!$hidden) ? print '</pre>' : print "\n-->";
571}
572
573/**
574 * Add's an entry to the changelog
575 *
576 * @author Andreas Gohr <andi@splitbrain.org>
577 */
578function addLogEntry($date,$id,$summary=""){
579  global $conf;
580  $id     = cleanID($id);//FIXME not needed anymore?
581
582  if(!@is_writable($conf['changelog'])){
583    msg($conf['changelog'].' is not writable!',-1);
584    return;
585  }
586
587  if(!$date) $date = time(); //use current time if none supplied
588  $remote = $_SERVER['REMOTE_ADDR'];
589  $user   = $_SERVER['REMOTE_USER'];
590
591  $logline = join("\t",array($date,$remote,$id,$user,$summary))."\n";
592
593  //FIXME: use adjusted io_saveFile instead
594  $fh = fopen($conf['changelog'],'a');
595  if($fh){
596    fwrite($fh,$logline);
597    fclose($fh);
598  }
599}
600
601/**
602 * returns an array of recently changed files using the
603 * changelog
604 *
605 * @author Andreas Gohr <andi@splitbrain.org>
606 */
607function getRecents($num=0,$incdel=false){
608  global $conf;
609  $recent = array();
610  if(!$num) $num = $conf['recent'];
611
612  if(!@is_readable($conf['changelog'])){
613    msg($conf['changelog'].' is not readable',-1);
614    return $recent;
615  }
616
617  $loglines = file($conf['changelog']);
618  rsort($loglines); //reverse sort on timestamp
619
620  foreach ($loglines as $line){
621    $line = rtrim($line);        //remove newline
622    if(empty($line)) continue;   //skip empty lines
623    $info = split("\t",$line);   //split into parts
624    //add id if not in yet and file still exists and is allowed to read
625    if(!$recent[$info[2]] &&
626       (@file_exists(wikiFN($info[2])) || $incdel) &&
627       (auth_quickaclcheck($info[2]) >= AUTH_READ)
628      ){
629      $recent[$info[2]]['date'] = $info[0];
630      $recent[$info[2]]['ip']   = $info[1];
631      $recent[$info[2]]['user'] = $info[3];
632      $recent[$info[2]]['sum']  = $info[4];
633      $recent[$info[2]]['del']  = !@file_exists(wikiFN($info[2]));
634    }
635    if(count($recent) >= $num){
636      break; //finish if enough items found
637    }
638  }
639  return $recent;
640}
641
642/**
643 * gets additonal informations for a certain pagerevison
644 * from the changelog
645 *
646 * @author Andreas Gohr <andi@splitbrain.org>
647 */
648function getRevisionInfo($id,$rev){
649  global $conf;
650
651  if(!$rev) return(null);
652
653  $info = array();
654  if(!@is_readable($conf['changelog'])){
655    msg($conf['changelog'].' is not readable',-1);
656    return $recent;
657  }
658  $loglines = file($conf['changelog']);
659  $loglines = preg_grep("/$rev\t\d+\.\d+\.\d+\.\d+\t$id\t/",$loglines);
660  rsort($loglines); //reverse sort on timestamp (shouldn't be needed)
661  $line = split("\t",$loglines[0]);
662  $info['date'] = $line[0];
663  $info['ip']   = $line[1];
664  $info['user'] = $line[3];
665  $info['sum']   = $line[4];
666  return $info;
667}
668
669/**
670 * Saves a wikitext by calling io_saveFile
671 *
672 * @author Andreas Gohr <andi@splitbrain.org>
673 */
674function saveWikiText($id,$text,$summary){
675  global $conf;
676  global $lang;
677  umask($conf['umask']);
678  // ignore if no changes were made
679  if($text == rawWiki($id,'')){
680    return;
681  }
682
683  $file = wikiFN($id);
684  $old  = saveOldRevision($id);
685
686  if (empty($text)){
687    // remove empty files
688    @unlink($file);
689    $del = true;
690    //autoset summary on deletion
691    if(empty($summary)) $summary = $lang['deleted'];
692    //remove empty namespaces
693    io_sweepNS($id);
694  }else{
695    // save file (datadir is created in io_saveFile)
696    io_saveFile($file,$text);
697    $del = false;
698  }
699
700  addLogEntry(@filemtime($file),$id,$summary);
701  notify($id,$old,$summary);
702
703  //purge cache on add by updating the purgefile
704  if($conf['purgeonadd'] && (!$old || $del)){
705    io_saveFile($conf['datadir'].'/.cache/purgefile',time());
706  }
707}
708
709/**
710 * moves the current version to the attic and returns its
711 * revision date
712 *
713 * @author Andreas Gohr <andi@splitbrain.org>
714 */
715function saveOldRevision($id){
716	global $conf;
717  umask($conf['umask']);
718  $oldf = wikiFN($id);
719  if(!@file_exists($oldf)) return '';
720  $date = filemtime($oldf);
721  $newf = wikiFN($id,$date);
722  if(substr($newf,-3)=='.gz'){
723    io_saveFile($newf,rawWiki($id));
724  }else{
725    io_makeFileDir($newf);
726    copy($oldf, $newf);
727  }
728  return $date;
729}
730
731/**
732 * Sends a notify mail to the wikiadmin when a page was
733 * changed
734 *
735 * @author Andreas Gohr <andi@splitbrain.org>
736 */
737function notify($id,$rev="",$summary=""){
738  global $lang;
739  global $conf;
740  $hdrs ='';
741  if(empty($conf['notify'])) return; //notify enabled?
742
743  $text = rawLocale('mailtext');
744  $text = str_replace('@DATE@',date($conf['dformat']),$text);
745  $text = str_replace('@BROWSER@',$_SERVER['HTTP_USER_AGENT'],$text);
746  $text = str_replace('@IPADDRESS@',$_SERVER['REMOTE_ADDR'],$text);
747  $text = str_replace('@HOSTNAME@',gethostbyaddr($_SERVER['REMOTE_ADDR']),$text);
748  $text = str_replace('@NEWPAGE@',wl($id,'',true),$text);
749  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
750  $text = str_replace('@SUMMARY@',$summary,$text);
751  $text = str_replace('@USER@',$_SERVER['REMOTE_USER'],$text);
752
753  if($rev){
754    $subject = $lang['mail_changed'].' '.$id;
755    $text = str_replace('@OLDPAGE@',wl($id,"rev=$rev",true),$text);
756    require_once("inc/DifferenceEngine.php");
757    $df  = new Diff(split("\n",rawWiki($id,$rev)),
758                    split("\n",rawWiki($id)));
759    $dformat = new UnifiedDiffFormatter();
760    $diff    = $dformat->format($df);
761  }else{
762    $subject=$lang['mail_newpage'].' '.$id;
763    $text = str_replace('@OLDPAGE@','none',$text);
764    $diff = rawWiki($id);
765  }
766  $text = str_replace('@DIFF@',$diff,$text);
767
768  mail_send($conf['notify'],$subject,$text,$conf['mailfrom']);
769}
770
771/**
772 * Return a list of available page revisons
773 *
774 * @author Andreas Gohr <andi@splitbrain.org>
775 */
776function getRevisions($id){
777  $revd = dirname(wikiFN($id,'foo'));
778  $revs = array();
779  $clid = cleanID($id);
780  if(strrpos($clid,':')) $clid = substr($clid,strrpos($clid,':')+1); //remove path
781
782  if (is_dir($revd) && $dh = opendir($revd)) {
783    while (($file = readdir($dh)) !== false) {
784      if (is_dir($revd.'/'.$file)) continue;
785      if (preg_match('/^'.$clid.'\.(\d+)\.txt(\.gz)?$/',$file,$match)){
786        $revs[]=$match[1];
787      }
788    }
789    closedir($dh);
790  }
791  rsort($revs);
792  return $revs;
793}
794
795/**
796 * downloads a file from the net and saves it to the given location
797 *
798 * @author Andreas Gohr <andi@splitbrain.org>
799 */
800function download($url,$file){
801  $fp = @fopen($url,"rb");
802  if(!$fp) return false;
803
804  while(!feof($fp)){
805    $cont.= fread($fp,1024);
806  }
807  fclose($fp);
808
809  $fp2 = @fopen($file,"w");
810  if(!$fp2) return false;
811  fwrite($fp2,$cont);
812  fclose($fp2);
813  return true;
814}
815
816/**
817 * extracts the query from a google referer
818 *
819 * @todo   should be more generic and support yahoo et al
820 * @author Andreas Gohr <andi@splitbrain.org>
821 */
822function getGoogleQuery(){
823  $url = parse_url($_SERVER['HTTP_REFERER']);
824
825  if(!preg_match("#google\.#i",$url['host'])) return '';
826  $query = array();
827  parse_str($url['query'],$query);
828
829  return $query['q'];
830}
831
832/**
833 * Try to set correct locale
834 *
835 * @deprecated No longer used
836 * @author     Andreas Gohr <andi@splitbrain.org>
837 */
838function setCorrectLocale(){
839  global $conf;
840  global $lang;
841
842  $enc = strtoupper($lang['encoding']);
843  foreach ($lang['locales'] as $loc){
844    //try locale
845    if(@setlocale(LC_ALL,$loc)) return;
846    //try loceale with encoding
847    if(@setlocale(LC_ALL,"$loc.$enc")) return;
848  }
849  //still here? try to set from environment
850  @setlocale(LC_ALL,"");
851}
852
853/**
854 * Return the human readable size of a file
855 *
856 * @param       int    $size   A file size
857 * @param       int    $dec    A number of decimal places
858 * @author      Martin Benjamin <b.martin@cybernet.ch>
859 * @author      Aidan Lister <aidan@php.net>
860 * @version     1.0.0
861 */
862function filesize_h($size, $dec = 1){
863  $sizes = array('B', 'KB', 'MB', 'GB');
864  $count = count($sizes);
865  $i = 0;
866
867  while ($size >= 1024 && ($i < $count - 1)) {
868    $size /= 1024;
869    $i++;
870  }
871
872  return round($size, $dec) . ' ' . $sizes[$i];
873}
874
875/**
876 * Run a few sanity checks
877 *
878 * @author Andreas Gohr <andi@splitbrain.org>
879 */
880function getVersion(){
881  //import version string
882  if(@file_exists('VERSION')){
883    //official release
884    return 'Release '.io_readfile('VERSION');
885  }elseif(is_dir('_darcs')){
886    //darcs checkout
887    $inv = file('_darcs/inventory');
888    $inv = preg_grep('#andi@splitbrain\.org\*\*\d{14}#',$inv);
889    $cur = array_pop($inv);
890    preg_match('#\*\*(\d{4})(\d{2})(\d{2})#',$cur,$matches);
891    return 'Darcs '.$matches[1].'-'.$matches[2].'-'.$matches[3];
892  }else{
893    return 'snapshot?';
894  }
895}
896
897/**
898 * Run a few sanity checks
899 *
900 * @author Andreas Gohr <andi@splitbrain.org>
901 */
902function check(){
903  global $conf;
904  global $INFO;
905
906  msg('DokuWiki version: '.getVersion(),1);
907
908  if(version_compare(phpversion(),'4.3.0','<')){
909    msg('Your PHP version is too old ('.phpversion().' vs. 4.3.+ recommended)',-1);
910  }elseif(version_compare(phpversion(),'4.3.10','<')){
911    msg('Consider upgrading PHP to 4.3.10 or higher for security reasons (your version: '.phpversion().')',0);
912  }else{
913    msg('PHP version '.phpversion(),1);
914  }
915
916  if(is_writable($conf['changelog'])){
917    msg('Changelog is writable',1);
918  }else{
919    msg('Changelog is not writable',-1);
920  }
921
922  if(is_writable($conf['datadir'])){
923    msg('Datadir is writable',1);
924  }else{
925    msg('Datadir is not writable',-1);
926  }
927
928  if(is_writable($conf['olddir'])){
929    msg('Attic is writable',1);
930  }else{
931    msg('Attic is not writable',-1);
932  }
933
934  if(is_writable($conf['mediadir'])){
935    msg('Mediadir is writable',1);
936  }else{
937    msg('Mediadir is not writable',-1);
938  }
939
940  if(is_writable('conf/users.auth')){
941    msg('conf/users.auth is writable',1);
942  }else{
943    msg('conf/users.auth is not writable',0);
944  }
945
946  if(function_exists('mb_strpos')){
947    if(defined('UTF8_NOMBSTRING')){
948      msg('mb_string extension is available but will not be used',0);
949    }else{
950      msg('mb_string extension is available and will be used',1);
951    }
952  }else{
953    msg('mb_string extension not available - PHP only replacements will be used',0);
954  }
955
956  msg('Your current permission for this page is '.$INFO['perm'],0);
957
958  if(is_writable($INFO['filepath'])){
959    msg('The current page is writable by the webserver',0);
960  }else{
961    msg('The current page is not writable by the webserver',0);
962  }
963
964  if($INFO['writable']){
965    msg('The current page is writable by you',0);
966  }else{
967    msg('The current page is not writable you',0);
968  }
969}
970?>
971