xref: /dokuwiki/inc/common.php (revision ba09710ad34bb383ae3526e84490a3d545f78866) 
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 */
26function hsc($string) {
27    return htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
28}
29
30/**
31 * print a newline terminated string
32 *
33 * You can give an indention as optional parameter
34 *
35 * @author Andreas Gohr <andi@splitbrain.org>
36 */
37function ptln($string, $indent = 0) {
38    echo str_repeat(' ', $indent)."$string\n";
39}
40
41/**
42 * strips control characters (<32) from the given string
43 *
44 * @author Andreas Gohr <andi@splitbrain.org>
45 */
46function stripctl($string) {
47    return preg_replace('/[\x00-\x1F]+/s', '', $string);
48}
49
50/**
51 * Return a secret token to be used for CSRF attack prevention
52 *
53 * @author  Andreas Gohr <andi@splitbrain.org>
54 * @link    http://en.wikipedia.org/wiki/Cross-site_request_forgery
55 * @link    http://christ1an.blogspot.com/2007/04/preventing-csrf-efficiently.html
56 * @return  string
57 */
58function getSecurityToken() {
59    return md5(auth_cookiesalt().session_id().$_SERVER['REMOTE_USER']);
60}
61
62/**
63 * Check the secret CSRF token
64 */
65function checkSecurityToken($token = null) {
66    global $INPUT;
67    if(!$_SERVER['REMOTE_USER']) return true; // no logged in user, no need for a check
68
69    if(is_null($token)) $token = $INPUT->str('sectok');
70    if(getSecurityToken() != $token) {
71        msg('Security Token did not match. Possible CSRF attack.', -1);
72        return false;
73    }
74    return true;
75}
76
77/**
78 * Print a hidden form field with a secret CSRF token
79 *
80 * @author  Andreas Gohr <andi@splitbrain.org>
81 */
82function formSecurityToken($print = true) {
83    $ret = '<div class="no"><input type="hidden" name="sectok" value="'.getSecurityToken().'" /></div>'."\n";
84    if($print) echo $ret;
85    return $ret;
86}
87
88/**
89 * Return info about the current document as associative
90 * array.
91 *
92 * @author Andreas Gohr <andi@splitbrain.org>
93 */
94function pageinfo() {
95    global $ID;
96    global $REV;
97    global $RANGE;
98    global $USERINFO;
99    global $lang;
100
101    // include ID & REV not redundant, as some parts of DokuWiki may temporarily change $ID, e.g. p_wiki_xhtml
102    // FIXME ... perhaps it would be better to ensure the temporary changes weren't necessary
103    $info['id']  = $ID;
104    $info['rev'] = $REV;
105
106    // set info about manager/admin status.
107    $info['isadmin']   = false;
108    $info['ismanager'] = false;
109    if(isset($_SERVER['REMOTE_USER'])) {
110        $sub = new Subscription();
111
112        $info['userinfo']   = $USERINFO;
113        $info['perm']       = auth_quickaclcheck($ID);
114        $info['subscribed'] = $sub->user_subscription();
115        $info['client']     = $_SERVER['REMOTE_USER'];
116
117        if($info['perm'] == AUTH_ADMIN) {
118            $info['isadmin']   = true;
119            $info['ismanager'] = true;
120        } elseif(auth_ismanager()) {
121            $info['ismanager'] = true;
122        }
123
124        // if some outside auth were used only REMOTE_USER is set
125        if(!$info['userinfo']['name']) {
126            $info['userinfo']['name'] = $_SERVER['REMOTE_USER'];
127        }
128
129    } else {
130        $info['perm']       = auth_aclcheck($ID, '', null);
131        $info['subscribed'] = false;
132        $info['client']     = clientIP(true);
133    }
134
135    $info['namespace'] = getNS($ID);
136    $info['locked']    = checklock($ID);
137    $info['filepath']  = fullpath(wikiFN($ID));
138    $info['exists']    = @file_exists($info['filepath']);
139    if($REV) {
140        //check if current revision was meant
141        if($info['exists'] && (@filemtime($info['filepath']) == $REV)) {
142            $REV = '';
143        } elseif($RANGE) {
144            //section editing does not work with old revisions!
145            $REV   = '';
146            $RANGE = '';
147            msg($lang['nosecedit'], 0);
148        } else {
149            //really use old revision
150            $info['filepath'] = fullpath(wikiFN($ID, $REV));
151            $info['exists']   = @file_exists($info['filepath']);
152        }
153    }
154    $info['rev'] = $REV;
155    if($info['exists']) {
156        $info['writable'] = (is_writable($info['filepath']) &&
157            ($info['perm'] >= AUTH_EDIT));
158    } else {
159        $info['writable'] = ($info['perm'] >= AUTH_CREATE);
160    }
161    $info['editable'] = ($info['writable'] && empty($info['locked']));
162    $info['lastmod']  = @filemtime($info['filepath']);
163
164    //load page meta data
165    $info['meta'] = p_get_metadata($ID);
166
167    //who's the editor
168    if($REV) {
169        $revinfo = getRevisionInfo($ID, $REV, 1024);
170    } else {
171        if(is_array($info['meta']['last_change'])) {
172            $revinfo = $info['meta']['last_change'];
173        } else {
174            $revinfo = getRevisionInfo($ID, $info['lastmod'], 1024);
175            // cache most recent changelog line in metadata if missing and still valid
176            if($revinfo !== false) {
177                $info['meta']['last_change'] = $revinfo;
178                p_set_metadata($ID, array('last_change' => $revinfo));
179            }
180        }
181    }
182    //and check for an external edit
183    if($revinfo !== false && $revinfo['date'] != $info['lastmod']) {
184        // cached changelog line no longer valid
185        $revinfo                     = false;
186        $info['meta']['last_change'] = $revinfo;
187        p_set_metadata($ID, array('last_change' => $revinfo));
188    }
189
190    $info['ip']   = $revinfo['ip'];
191    $info['user'] = $revinfo['user'];
192    $info['sum']  = $revinfo['sum'];
193    // See also $INFO['meta']['last_change'] which is the most recent log line for page $ID.
194    // Use $INFO['meta']['last_change']['type']===DOKU_CHANGE_TYPE_MINOR_EDIT in place of $info['minor'].
195
196    if($revinfo['user']) {
197        $info['editor'] = $revinfo['user'];
198    } else {
199        $info['editor'] = $revinfo['ip'];
200    }
201
202    // draft
203    $draft = getCacheName($info['client'].$ID, '.draft');
204    if(@file_exists($draft)) {
205        if(@filemtime($draft) < @filemtime(wikiFN($ID))) {
206            // remove stale draft
207            @unlink($draft);
208        } else {
209            $info['draft'] = $draft;
210        }
211    }
212
213    // mobile detection
214    $info['ismobile'] = clientismobile();
215
216    return $info;
217}
218
219/**
220 * Build an string of URL parameters
221 *
222 * @author Andreas Gohr
223 */
224function buildURLparams($params, $sep = '&amp;') {
225    $url = '';
226    $amp = false;
227    foreach($params as $key => $val) {
228        if($amp) $url .= $sep;
229
230        $url .= rawurlencode($key).'=';
231        $url .= rawurlencode((string) $val);
232        $amp = true;
233    }
234    return $url;
235}
236
237/**
238 * Build an string of html tag attributes
239 *
240 * Skips keys starting with '_', values get HTML encoded
241 *
242 * @author Andreas Gohr
243 */
244function buildAttributes($params, $skipempty = false) {
245    $url   = '';
246    $white = false;
247    foreach($params as $key => $val) {
248        if($key{0} == '_') continue;
249        if($val === '' && $skipempty) continue;
250        if($white) $url .= ' ';
251
252        $url .= $key.'="';
253        $url .= htmlspecialchars($val);
254        $url .= '"';
255        $white = true;
256    }
257    return $url;
258}
259
260/**
261 * This builds the breadcrumb trail and returns it as array
262 *
263 * @author Andreas Gohr <andi@splitbrain.org>
264 */
265function breadcrumbs() {
266    // we prepare the breadcrumbs early for quick session closing
267    static $crumbs = null;
268    if($crumbs != null) return $crumbs;
269
270    global $ID;
271    global $ACT;
272    global $conf;
273
274    //first visit?
275    $crumbs = isset($_SESSION[DOKU_COOKIE]['bc']) ? $_SESSION[DOKU_COOKIE]['bc'] : array();
276    //we only save on show and existing wiki documents
277    $file = wikiFN($ID);
278    if($ACT != 'show' || !@file_exists($file)) {
279        $_SESSION[DOKU_COOKIE]['bc'] = $crumbs;
280        return $crumbs;
281    }
282
283    // page names
284    $name = noNSorNS($ID);
285    if(useHeading('navigation')) {
286        // get page title
287        $title = p_get_first_heading($ID, METADATA_RENDER_USING_SIMPLE_CACHE);
288        if($title) {
289            $name = $title;
290        }
291    }
292
293    //remove ID from array
294    if(isset($crumbs[$ID])) {
295        unset($crumbs[$ID]);
296    }
297
298    //add to array
299    $crumbs[$ID] = $name;
300    //reduce size
301    while(count($crumbs) > $conf['breadcrumbs']) {
302        array_shift($crumbs);
303    }
304    //save to session
305    $_SESSION[DOKU_COOKIE]['bc'] = $crumbs;
306    return $crumbs;
307}
308
309/**
310 * Filter for page IDs
311 *
312 * This is run on a ID before it is outputted somewhere
313 * currently used to replace the colon with something else
314 * on Windows (non-IIS) systems and to have proper URL encoding
315 *
316 * See discussions at https://github.com/splitbrain/dokuwiki/pull/84 and
317 * https://github.com/splitbrain/dokuwiki/pull/173 why we use a whitelist of
318 * unaffected servers instead of blacklisting affected servers here.
319 *
320 * Urlencoding is ommitted when the second parameter is false
321 *
322 * @author Andreas Gohr <andi@splitbrain.org>
323 */
324function idfilter($id, $ue = true) {
325    global $conf;
326    if($conf['useslash'] && $conf['userewrite']) {
327        $id = strtr($id, ':', '/');
328    } elseif(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' &&
329        $conf['userewrite'] &&
330        strpos($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS') === false
331    ) {
332        $id = strtr($id, ':', ';');
333    }
334    if($ue) {
335        $id = rawurlencode($id);
336        $id = str_replace('%3A', ':', $id); //keep as colon
337        $id = str_replace('%2F', '/', $id); //keep as slash
338    }
339    return $id;
340}
341
342/**
343 * This builds a link to a wikipage
344 *
345 * It handles URL rewriting and adds additional parameter if
346 * given in $more
347 *
348 * @author Andreas Gohr <andi@splitbrain.org>
349 */
350function wl($id = '', $urlParameters = '', $absolute = false, $separator = '&amp;') {
351    global $conf;
352    if(is_array($urlParameters)) {
353        $urlParameters = buildURLparams($urlParameters, $separator);
354    } else {
355        $urlParameters = str_replace(',', $separator, $urlParameters);
356    }
357    if($id === '') {
358        $id = $conf['start'];
359    }
360    $id = idfilter($id);
361    if($absolute) {
362        $xlink = DOKU_URL;
363    } else {
364        $xlink = DOKU_BASE;
365    }
366
367    if($conf['userewrite'] == 2) {
368        $xlink .= DOKU_SCRIPT.'/'.$id;
369        if($urlParameters) $xlink .= '?'.$urlParameters;
370    } elseif($conf['userewrite']) {
371        $xlink .= $id;
372        if($urlParameters) $xlink .= '?'.$urlParameters;
373    } elseif($id) {
374        $xlink .= DOKU_SCRIPT.'?id='.$id;
375        if($urlParameters) $xlink .= $separator.$urlParameters;
376    } else {
377        $xlink .= DOKU_SCRIPT;
378        if($urlParameters) $xlink .= '?'.$urlParameters;
379    }
380
381    return $xlink;
382}
383
384/**
385 * This builds a link to an alternate page format
386 *
387 * Handles URL rewriting if enabled. Follows the style of wl().
388 *
389 * @author Ben Coburn <btcoburn@silicodon.net>
390 */
391function exportlink($id = '', $format = 'raw', $more = '', $abs = false, $sep = '&amp;') {
392    global $conf;
393    if(is_array($more)) {
394        $more = buildURLparams($more, $sep);
395    } else {
396        $more = str_replace(',', $sep, $more);
397    }
398
399    $format = rawurlencode($format);
400    $id     = idfilter($id);
401    if($abs) {
402        $xlink = DOKU_URL;
403    } else {
404        $xlink = DOKU_BASE;
405    }
406
407    if($conf['userewrite'] == 2) {
408        $xlink .= DOKU_SCRIPT.'/'.$id.'?do=export_'.$format;
409        if($more) $xlink .= $sep.$more;
410    } elseif($conf['userewrite'] == 1) {
411        $xlink .= '_export/'.$format.'/'.$id;
412        if($more) $xlink .= '?'.$more;
413    } else {
414        $xlink .= DOKU_SCRIPT.'?do=export_'.$format.$sep.'id='.$id;
415        if($more) $xlink .= $sep.$more;
416    }
417
418    return $xlink;
419}
420
421/**
422 * Build a link to a media file
423 *
424 * Will return a link to the detail page if $direct is false
425 *
426 * The $more parameter should always be given as array, the function then
427 * will strip default parameters to produce even cleaner URLs
428 *
429 * @param string  $id     the media file id or URL
430 * @param mixed   $more   string or array with additional parameters
431 * @param bool    $direct link to detail page if false
432 * @param string  $sep    URL parameter separator
433 * @param bool    $abs    Create an absolute URL
434 * @return string
435 */
436function ml($id = '', $more = '', $direct = true, $sep = '&amp;', $abs = false) {
437    global $conf;
438    if(is_array($more)) {
439        // add token for resized images
440        if($more['w'] || $more['h']){
441            $more['tok'] = media_get_token($id,$more['w'],$more['h']);
442        }
443        // strip defaults for shorter URLs
444        if(isset($more['cache']) && $more['cache'] == 'cache') unset($more['cache']);
445        if(!$more['w']) unset($more['w']);
446        if(!$more['h']) unset($more['h']);
447        if(isset($more['id']) && $direct) unset($more['id']);
448        $more = buildURLparams($more, $sep);
449    } else {
450        $more = str_replace('cache=cache', '', $more); //skip default
451        $more = str_replace(',,', ',', $more);
452        $more = str_replace(',', $sep, $more);
453    }
454
455    if($abs) {
456        $xlink = DOKU_URL;
457    } else {
458        $xlink = DOKU_BASE;
459    }
460
461    // external URLs are always direct without rewriting
462    if(preg_match('#^(https?|ftp)://#i', $id)) {
463        $xlink .= 'lib/exe/fetch.php';
464        // add hash:
465        $xlink .= '?hash='.substr(md5(auth_cookiesalt().$id), 0, 6);
466        if($more) {
467            $xlink .= $sep.$more;
468            $xlink .= $sep.'media='.rawurlencode($id);
469        } else {
470            $xlink .= $sep.'media='.rawurlencode($id);
471        }
472        return $xlink;
473    }
474
475    $id = idfilter($id);
476
477    // decide on scriptname
478    if($direct) {
479        if($conf['userewrite'] == 1) {
480            $script = '_media';
481        } else {
482            $script = 'lib/exe/fetch.php';
483        }
484    } else {
485        if($conf['userewrite'] == 1) {
486            $script = '_detail';
487        } else {
488            $script = 'lib/exe/detail.php';
489        }
490    }
491
492    // build URL based on rewrite mode
493    if($conf['userewrite']) {
494        $xlink .= $script.'/'.$id;
495        if($more) $xlink .= '?'.$more;
496    } else {
497        if($more) {
498            $xlink .= $script.'?'.$more;
499            $xlink .= $sep.'media='.$id;
500        } else {
501            $xlink .= $script.'?media='.$id;
502        }
503    }
504
505    return $xlink;
506}
507
508/**
509 * Returns the URL to the DokuWiki base script
510 *
511 * Consider using wl() instead, unless you absoutely need the doku.php endpoint
512 *
513 * @author Andreas Gohr <andi@splitbrain.org>
514 */
515function script() {
516    return DOKU_BASE.DOKU_SCRIPT;
517}
518
519/**
520 * Spamcheck against wordlist
521 *
522 * Checks the wikitext against a list of blocked expressions
523 * returns true if the text contains any bad words
524 *
525 * Triggers COMMON_WORDBLOCK_BLOCKED
526 *
527 *  Action Plugins can use this event to inspect the blocked data
528 *  and gain information about the user who was blocked.
529 *
530 *  Event data:
531 *    data['matches']  - array of matches
532 *    data['userinfo'] - information about the blocked user
533 *      [ip]           - ip address
534 *      [user]         - username (if logged in)
535 *      [mail]         - mail address (if logged in)
536 *      [name]         - real name (if logged in)
537 *
538 * @author Andreas Gohr <andi@splitbrain.org>
539 * @author Michael Klier <chi@chimeric.de>
540 * @param  string $text - optional text to check, if not given the globals are used
541 * @return bool         - true if a spam word was found
542 */
543function checkwordblock($text = '') {
544    global $TEXT;
545    global $PRE;
546    global $SUF;
547    global $conf;
548    global $INFO;
549
550    if(!$conf['usewordblock']) return false;
551
552    if(!$text) $text = "$PRE $TEXT $SUF";
553
554    // we prepare the text a tiny bit to prevent spammers circumventing URL checks
555    $text = preg_replace('!(\b)(www\.[\w.:?\-;,]+?\.[\w.:?\-;,]+?[\w/\#~:.?+=&%@\!\-.:?\-;,]+?)([.:?\-;,]*[^\w/\#~:.?+=&%@\!\-.:?\-;,])!i', '\1http://\2 \2\3', $text);
556
557    $wordblocks = getWordblocks();
558    // how many lines to read at once (to work around some PCRE limits)
559    if(version_compare(phpversion(), '4.3.0', '<')) {
560        // old versions of PCRE define a maximum of parenthesises even if no
561        // backreferences are used - the maximum is 99
562        // this is very bad performancewise and may even be too high still
563        $chunksize = 40;
564    } else {
565        // read file in chunks of 200 - this should work around the
566        // MAX_PATTERN_SIZE in modern PCRE
567        $chunksize = 200;
568    }
569    while($blocks = array_splice($wordblocks, 0, $chunksize)) {
570        $re = array();
571        // build regexp from blocks
572        foreach($blocks as $block) {
573            $block = preg_replace('/#.*$/', '', $block);
574            $block = trim($block);
575            if(empty($block)) continue;
576            $re[] = $block;
577        }
578        if(count($re) && preg_match('#('.join('|', $re).')#si', $text, $matches)) {
579            // prepare event data
580            $data['matches']        = $matches;
581            $data['userinfo']['ip'] = $_SERVER['REMOTE_ADDR'];
582            if($_SERVER['REMOTE_USER']) {
583                $data['userinfo']['user'] = $_SERVER['REMOTE_USER'];
584                $data['userinfo']['name'] = $INFO['userinfo']['name'];
585                $data['userinfo']['mail'] = $INFO['userinfo']['mail'];
586            }
587            $callback = create_function('', 'return true;');
588            return trigger_event('COMMON_WORDBLOCK_BLOCKED', $data, $callback, true);
589        }
590    }
591    return false;
592}
593
594/**
595 * Return the IP of the client
596 *
597 * Honours X-Forwarded-For and X-Real-IP Proxy Headers
598 *
599 * It returns a comma separated list of IPs if the above mentioned
600 * headers are set. If the single parameter is set, it tries to return
601 * a routable public address, prefering the ones suplied in the X
602 * headers
603 *
604 * @author Andreas Gohr <andi@splitbrain.org>
605 * @param  boolean $single If set only a single IP is returned
606 * @return string
607 */
608function clientIP($single = false) {
609    $ip   = array();
610    $ip[] = $_SERVER['REMOTE_ADDR'];
611    if(!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
612        $ip = array_merge($ip, explode(',', str_replace(' ', '', $_SERVER['HTTP_X_FORWARDED_FOR'])));
613    if(!empty($_SERVER['HTTP_X_REAL_IP']))
614        $ip = array_merge($ip, explode(',', str_replace(' ', '', $_SERVER['HTTP_X_REAL_IP'])));
615
616    // some IPv4/v6 regexps borrowed from Feyd
617    // see: http://forums.devnetwork.net/viewtopic.php?f=38&t=53479
618    $dec_octet   = '(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[0-9])';
619    $hex_digit   = '[A-Fa-f0-9]';
620    $h16         = "{$hex_digit}{1,4}";
621    $IPv4Address = "$dec_octet\\.$dec_octet\\.$dec_octet\\.$dec_octet";
622    $ls32        = "(?:$h16:$h16|$IPv4Address)";
623    $IPv6Address =
624        "(?:(?:{$IPv4Address})|(?:".
625            "(?:$h16:){6}$ls32".
626            "|::(?:$h16:){5}$ls32".
627            "|(?:$h16)?::(?:$h16:){4}$ls32".
628            "|(?:(?:$h16:){0,1}$h16)?::(?:$h16:){3}$ls32".
629            "|(?:(?:$h16:){0,2}$h16)?::(?:$h16:){2}$ls32".
630            "|(?:(?:$h16:){0,3}$h16)?::(?:$h16:){1}$ls32".
631            "|(?:(?:$h16:){0,4}$h16)?::$ls32".
632            "|(?:(?:$h16:){0,5}$h16)?::$h16".
633            "|(?:(?:$h16:){0,6}$h16)?::".
634            ")(?:\\/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))?)";
635
636    // remove any non-IP stuff
637    $cnt   = count($ip);
638    $match = array();
639    for($i = 0; $i < $cnt; $i++) {
640        if(preg_match("/^$IPv4Address$/", $ip[$i], $match) || preg_match("/^$IPv6Address$/", $ip[$i], $match)) {
641            $ip[$i] = $match[0];
642        } else {
643            $ip[$i] = '';
644        }
645        if(empty($ip[$i])) unset($ip[$i]);
646    }
647    $ip = array_values(array_unique($ip));
648    if(!$ip[0]) $ip[0] = '0.0.0.0'; // for some strange reason we don't have a IP
649
650    if(!$single) return join(',', $ip);
651
652    // decide which IP to use, trying to avoid local addresses
653    $ip = array_reverse($ip);
654    foreach($ip as $i) {
655        if(preg_match('/^(::1|[fF][eE]80:|127\.|10\.|192\.168\.|172\.((1[6-9])|(2[0-9])|(3[0-1]))\.)/', $i)) {
656            continue;
657        } else {
658            return $i;
659        }
660    }
661    // still here? just use the first (last) address
662    return $ip[0];
663}
664
665/**
666 * Check if the browser is on a mobile device
667 *
668 * Adapted from the example code at url below
669 *
670 * @link http://www.brainhandles.com/2007/10/15/detecting-mobile-browsers/#code
671 */
672function clientismobile() {
673
674    if(isset($_SERVER['HTTP_X_WAP_PROFILE'])) return true;
675
676    if(preg_match('/wap\.|\.wap/i', $_SERVER['HTTP_ACCEPT'])) return true;
677
678    if(!isset($_SERVER['HTTP_USER_AGENT'])) return false;
679
680    $uamatches = 'midp|j2me|avantg|docomo|novarra|palmos|palmsource|240x320|opwv|chtml|pda|windows ce|mmp\/|blackberry|mib\/|symbian|wireless|nokia|hand|mobi|phone|cdm|up\.b|audio|SIE\-|SEC\-|samsung|HTC|mot\-|mitsu|sagem|sony|alcatel|lg|erics|vx|NEC|philips|mmm|xx|panasonic|sharp|wap|sch|rover|pocket|benq|java|pt|pg|vox|amoi|bird|compal|kg|voda|sany|kdd|dbt|sendo|sgh|gradi|jb|\d\d\di|moto';
681
682    if(preg_match("/$uamatches/i", $_SERVER['HTTP_USER_AGENT'])) return true;
683
684    return false;
685}
686
687/**
688 * Convert one or more comma separated IPs to hostnames
689 *
690 * If $conf['dnslookups'] is disabled it simply returns the input string
691 *
692 * @author Glen Harris <astfgl@iamnota.org>
693 * @param  string $ips comma separated list of IP addresses
694 * @return string a comma separated list of hostnames
695 */
696function gethostsbyaddrs($ips) {
697    global $conf;
698    if(!$conf['dnslookups']) return $ips;
699
700    $hosts = array();
701    $ips   = explode(',', $ips);
702
703    if(is_array($ips)) {
704        foreach($ips as $ip) {
705            $hosts[] = gethostbyaddr(trim($ip));
706        }
707        return join(',', $hosts);
708    } else {
709        return gethostbyaddr(trim($ips));
710    }
711}
712
713/**
714 * Checks if a given page is currently locked.
715 *
716 * removes stale lockfiles
717 *
718 * @author Andreas Gohr <andi@splitbrain.org>
719 */
720function checklock($id) {
721    global $conf;
722    $lock = wikiLockFN($id);
723
724    //no lockfile
725    if(!@file_exists($lock)) return false;
726
727    //lockfile expired
728    if((time() - filemtime($lock)) > $conf['locktime']) {
729        @unlink($lock);
730        return false;
731    }
732
733    //my own lock
734    list($ip, $session) = explode("\n", io_readFile($lock));
735    if($ip == $_SERVER['REMOTE_USER'] || $ip == clientIP() || $session == session_id()) {
736        return false;
737    }
738
739    return $ip;
740}
741
742/**
743 * Lock a page for editing
744 *
745 * @author Andreas Gohr <andi@splitbrain.org>
746 */
747function lock($id) {
748    global $conf;
749
750    if($conf['locktime'] == 0) {
751        return;
752    }
753
754    $lock = wikiLockFN($id);
755    if($_SERVER['REMOTE_USER']) {
756        io_saveFile($lock, $_SERVER['REMOTE_USER']);
757    } else {
758        io_saveFile($lock, clientIP()."\n".session_id());
759    }
760}
761
762/**
763 * Unlock a page if it was locked by the user
764 *
765 * @author Andreas Gohr <andi@splitbrain.org>
766 * @param string $id page id to unlock
767 * @return bool true if a lock was removed
768 */
769function unlock($id) {
770    $lock = wikiLockFN($id);
771    if(@file_exists($lock)) {
772        list($ip, $session) = explode("\n", io_readFile($lock));
773        if($ip == $_SERVER['REMOTE_USER'] || $ip == clientIP() || $session == session_id()) {
774            @unlink($lock);
775            return true;
776        }
777    }
778    return false;
779}
780
781/**
782 * convert line ending to unix format
783 *
784 * @see    formText() for 2crlf conversion
785 * @author Andreas Gohr <andi@splitbrain.org>
786 */
787function cleanText($text) {
788    $text = preg_replace("/(\015\012)|(\015)/", "\012", $text);
789    return $text;
790}
791
792/**
793 * Prepares text for print in Webforms by encoding special chars.
794 * It also converts line endings to Windows format which is
795 * pseudo standard for webforms.
796 *
797 * @see    cleanText() for 2unix conversion
798 * @author Andreas Gohr <andi@splitbrain.org>
799 */
800function formText($text) {
801    $text = str_replace("\012", "\015\012", $text);
802    return htmlspecialchars($text);
803}
804
805/**
806 * Returns the specified local text in raw format
807 *
808 * @author Andreas Gohr <andi@splitbrain.org>
809 */
810function rawLocale($id, $ext = 'txt') {
811    return io_readFile(localeFN($id, $ext));
812}
813
814/**
815 * Returns the raw WikiText
816 *
817 * @author Andreas Gohr <andi@splitbrain.org>
818 */
819function rawWiki($id, $rev = '') {
820    return io_readWikiPage(wikiFN($id, $rev), $id, $rev);
821}
822
823/**
824 * Returns the pagetemplate contents for the ID's namespace
825 *
826 * @triggers COMMON_PAGETPL_LOAD
827 * @author Andreas Gohr <andi@splitbrain.org>
828 */
829function pageTemplate($id) {
830    global $conf;
831
832    if(is_array($id)) $id = $id[0];
833
834    // prepare initial event data
835    $data = array(
836        'id'        => $id, // the id of the page to be created
837        'tpl'       => '', // the text used as template
838        'tplfile'   => '', // the file above text was/should be loaded from
839        'doreplace' => true // should wildcard replacements be done on the text?
840    );
841
842    $evt = new Doku_Event('COMMON_PAGETPL_LOAD', $data);
843    if($evt->advise_before(true)) {
844        // the before event might have loaded the content already
845        if(empty($data['tpl'])) {
846            // if the before event did not set a template file, try to find one
847            if(empty($data['tplfile'])) {
848                $path = dirname(wikiFN($id));
849                if(@file_exists($path.'/_template.txt')) {
850                    $data['tplfile'] = $path.'/_template.txt';
851                } else {
852                    // search upper namespaces for templates
853                    $len = strlen(rtrim($conf['datadir'], '/'));
854                    while(strlen($path) >= $len) {
855                        if(@file_exists($path.'/__template.txt')) {
856                            $data['tplfile'] = $path.'/__template.txt';
857                            break;
858                        }
859                        $path = substr($path, 0, strrpos($path, '/'));
860                    }
861                }
862            }
863            // load the content
864            $data['tpl'] = io_readFile($data['tplfile']);
865        }
866        if($data['doreplace']) parsePageTemplate($data);
867    }
868    $evt->advise_after();
869    unset($evt);
870
871    return $data['tpl'];
872}
873
874/**
875 * Performs common page template replacements
876 * This works on data from COMMON_PAGETPL_LOAD
877 *
878 * @author Andreas Gohr <andi@splitbrain.org>
879 */
880function parsePageTemplate(&$data) {
881    /**
882     * @var string $id        the id of the page to be created
883     * @var string $tpl       the text used as template
884     * @var string $tplfile   the file above text was/should be loaded from
885     * @var bool   $doreplace should wildcard replacements be done on the text?
886     */
887    extract($data);
888
889    global $USERINFO;
890    global $conf;
891
892    // replace placeholders
893    $file = noNS($id);
894    $page = strtr($file, $conf['sepchar'], ' ');
895
896    $tpl = str_replace(
897        array(
898             '@ID@',
899             '@NS@',
900             '@FILE@',
901             '@!FILE@',
902             '@!FILE!@',
903             '@PAGE@',
904             '@!PAGE@',
905             '@!!PAGE@',
906             '@!PAGE!@',
907             '@USER@',
908             '@NAME@',
909             '@MAIL@',
910             '@DATE@',
911        ),
912        array(
913             $id,
914             getNS($id),
915             $file,
916             utf8_ucfirst($file),
917             utf8_strtoupper($file),
918             $page,
919             utf8_ucfirst($page),
920             utf8_ucwords($page),
921             utf8_strtoupper($page),
922             $_SERVER['REMOTE_USER'],
923             $USERINFO['name'],
924             $USERINFO['mail'],
925             $conf['dformat'],
926        ), $tpl
927    );
928
929    // we need the callback to work around strftime's char limit
930    $tpl         = preg_replace_callback('/%./', create_function('$m', 'return strftime($m[0]);'), $tpl);
931    $data['tpl'] = $tpl;
932    return $tpl;
933}
934
935/**
936 * Returns the raw Wiki Text in three slices.
937 *
938 * The range parameter needs to have the form "from-to"
939 * and gives the range of the section in bytes - no
940 * UTF-8 awareness is needed.
941 * The returned order is prefix, section and suffix.
942 *
943 * @author Andreas Gohr <andi@splitbrain.org>
944 */
945function rawWikiSlices($range, $id, $rev = '') {
946    $text = io_readWikiPage(wikiFN($id, $rev), $id, $rev);
947
948    // Parse range
949    list($from, $to) = explode('-', $range, 2);
950    // Make range zero-based, use defaults if marker is missing
951    $from = !$from ? 0 : ($from - 1);
952    $to   = !$to ? strlen($text) : ($to - 1);
953
954    $slices[0] = substr($text, 0, $from);
955    $slices[1] = substr($text, $from, $to - $from);
956    $slices[2] = substr($text, $to);
957    return $slices;
958}
959
960/**
961 * Joins wiki text slices
962 *
963 * function to join the text slices.
964 * When the pretty parameter is set to true it adds additional empty
965 * lines between sections if needed (used on saving).
966 *
967 * @author Andreas Gohr <andi@splitbrain.org>
968 */
969function con($pre, $text, $suf, $pretty = false) {
970    if($pretty) {
971        if($pre !== '' && substr($pre, -1) !== "\n" &&
972            substr($text, 0, 1) !== "\n"
973        ) {
974            $pre .= "\n";
975        }
976        if($suf !== '' && substr($text, -1) !== "\n" &&
977            substr($suf, 0, 1) !== "\n"
978        ) {
979            $text .= "\n";
980        }
981    }
982
983    return $pre.$text.$suf;
984}
985
986/**
987 * Saves a wikitext by calling io_writeWikiPage.
988 * Also directs changelog and attic updates.
989 *
990 * @author Andreas Gohr <andi@splitbrain.org>
991 * @author Ben Coburn <btcoburn@silicodon.net>
992 */
993function saveWikiText($id, $text, $summary, $minor = false) {
994    /* Note to developers:
995       This code is subtle and delicate. Test the behavior of
996       the attic and changelog with dokuwiki and external edits
997       after any changes. External edits change the wiki page
998       directly without using php or dokuwiki.
999     */
1000    global $conf;
1001    global $lang;
1002    global $REV;
1003    // ignore if no changes were made
1004    if($text == rawWiki($id, '')) {
1005        return;
1006    }
1007
1008    $file        = wikiFN($id);
1009    $old         = @filemtime($file); // from page
1010    $wasRemoved  = (trim($text) == ''); // check for empty or whitespace only
1011    $wasCreated  = !@file_exists($file);
1012    $wasReverted = ($REV == true);
1013    $newRev      = false;
1014    $oldRev      = getRevisions($id, -1, 1, 1024); // from changelog
1015    $oldRev      = (int) (empty($oldRev) ? 0 : $oldRev[0]);
1016    if(!@file_exists(wikiFN($id, $old)) && @file_exists($file) && $old >= $oldRev) {
1017        // add old revision to the attic if missing
1018        saveOldRevision($id);
1019        // add a changelog entry if this edit came from outside dokuwiki
1020        if($old > $oldRev) {
1021            addLogEntry($old, $id, DOKU_CHANGE_TYPE_EDIT, $lang['external_edit'], '', array('ExternalEdit'=> true));
1022            // remove soon to be stale instructions
1023            $cache = new cache_instructions($id, $file);
1024            $cache->removeCache();
1025        }
1026    }
1027
1028    if($wasRemoved) {
1029        // Send "update" event with empty data, so plugins can react to page deletion
1030        $data = array(array($file, '', false), getNS($id), noNS($id), false);
1031        trigger_event('IO_WIKIPAGE_WRITE', $data);
1032        // pre-save deleted revision
1033        @touch($file);
1034        clearstatcache();
1035        $newRev = saveOldRevision($id);
1036        // remove empty file
1037        @unlink($file);
1038        // don't remove old meta info as it should be saved, plugins can use IO_WIKIPAGE_WRITE for removing their metadata...
1039        // purge non-persistant meta data
1040        p_purge_metadata($id);
1041        $del = true;
1042        // autoset summary on deletion
1043        if(empty($summary)) $summary = $lang['deleted'];
1044        // remove empty namespaces
1045        io_sweepNS($id, 'datadir');
1046        io_sweepNS($id, 'mediadir');
1047    } else {
1048        // save file (namespace dir is created in io_writeWikiPage)
1049        io_writeWikiPage($file, $text, $id);
1050        // pre-save the revision, to keep the attic in sync
1051        $newRev = saveOldRevision($id);
1052        $del    = false;
1053    }
1054
1055    // select changelog line type
1056    $extra = '';
1057    $type  = DOKU_CHANGE_TYPE_EDIT;
1058    if($wasReverted) {
1059        $type  = DOKU_CHANGE_TYPE_REVERT;
1060        $extra = $REV;
1061    } else if($wasCreated) {
1062        $type = DOKU_CHANGE_TYPE_CREATE;
1063    } else if($wasRemoved) {
1064        $type = DOKU_CHANGE_TYPE_DELETE;
1065    } else if($minor && $conf['useacl'] && $_SERVER['REMOTE_USER']) {
1066        $type = DOKU_CHANGE_TYPE_MINOR_EDIT;
1067    } //minor edits only for logged in users
1068
1069    addLogEntry($newRev, $id, $type, $summary, $extra);
1070    // send notify mails
1071    notify($id, 'admin', $old, $summary, $minor);
1072    notify($id, 'subscribers', $old, $summary, $minor);
1073
1074    // update the purgefile (timestamp of the last time anything within the wiki was changed)
1075    io_saveFile($conf['cachedir'].'/purgefile', time());
1076
1077    // if useheading is enabled, purge the cache of all linking pages
1078    if(useHeading('content')) {
1079        $pages = ft_backlinks($id);
1080        foreach($pages as $page) {
1081            $cache = new cache_renderer($page, wikiFN($page), 'xhtml');
1082            $cache->removeCache();
1083        }
1084    }
1085}
1086
1087/**
1088 * moves the current version to the attic and returns its
1089 * revision date
1090 *
1091 * @author Andreas Gohr <andi@splitbrain.org>
1092 */
1093function saveOldRevision($id) {
1094    global $conf;
1095    $oldf = wikiFN($id);
1096    if(!@file_exists($oldf)) return '';
1097    $date = filemtime($oldf);
1098    $newf = wikiFN($id, $date);
1099    io_writeWikiPage($newf, rawWiki($id), $id, $date);
1100    return $date;
1101}
1102
1103/**
1104 * Sends a notify mail on page change or registration
1105 *
1106 * @param string     $id       The changed page
1107 * @param string     $who      Who to notify (admin|subscribers|register)
1108 * @param int|string $rev Old page revision
1109 * @param string     $summary  What changed
1110 * @param boolean    $minor    Is this a minor edit?
1111 * @param array      $replace  Additional string substitutions, @KEY@ to be replaced by value
1112 *
1113 * @return bool
1114 * @author Andreas Gohr <andi@splitbrain.org>
1115 */
1116function notify($id, $who, $rev = '', $summary = '', $minor = false, $replace = array()) {
1117    global $conf;
1118
1119    // decide if there is something to do, eg. whom to mail
1120    if($who == 'admin') {
1121        if(empty($conf['notify'])) return false; //notify enabled?
1122        $tpl = 'mailtext';
1123        $to  = $conf['notify'];
1124    } elseif($who == 'subscribers') {
1125        if(!actionOK('subscribe')) return false; //subscribers enabled?
1126        if($conf['useacl'] && $_SERVER['REMOTE_USER'] && $minor) return false; //skip minors
1127        $data = array('id' => $id, 'addresslist' => '', 'self' => false);
1128        trigger_event(
1129            'COMMON_NOTIFY_ADDRESSLIST', $data,
1130            array(new Subscription(), 'notifyaddresses')
1131        );
1132        $to = $data['addresslist'];
1133        if(empty($to)) return false;
1134        $tpl = 'subscr_single';
1135    } else {
1136        return false; //just to be safe
1137    }
1138
1139    // prepare content
1140    $subscription = new Subscription();
1141    return $subscription->send_diff($to, $tpl, $id, $rev, $summary);
1142}
1143
1144/**
1145 * extracts the query from a search engine referrer
1146 *
1147 * @author Andreas Gohr <andi@splitbrain.org>
1148 * @author Todd Augsburger <todd@rollerorgans.com>
1149 */
1150function getGoogleQuery() {
1151    if(!isset($_SERVER['HTTP_REFERER'])) {
1152        return '';
1153    }
1154    $url = parse_url($_SERVER['HTTP_REFERER']);
1155
1156    // only handle common SEs
1157    if(!preg_match('/(google|bing|yahoo|ask|duckduckgo|babylon|aol|yandex)/',$url['host'])) return '';
1158
1159    $query = array();
1160    // temporary workaround against PHP bug #49733
1161    // see http://bugs.php.net/bug.php?id=49733
1162    if(UTF8_MBSTRING) $enc = mb_internal_encoding();
1163    parse_str($url['query'], $query);
1164    if(UTF8_MBSTRING) mb_internal_encoding($enc);
1165
1166    $q = '';
1167    if(isset($query['q'])){
1168        $q = $query['q'];
1169    }elseif(isset($query['p'])){
1170        $q = $query['p'];
1171    }elseif(isset($query['query'])){
1172        $q = $query['query'];
1173    }
1174    $q = trim($q);
1175
1176    if(!$q) return '';
1177    $q = preg_split('/[\s\'"\\\\`()\]\[?:!\.{};,#+*<>\\/]+/', $q, -1, PREG_SPLIT_NO_EMPTY);
1178    return $q;
1179}
1180
1181/**
1182 * Return the human readable size of a file
1183 *
1184 * @param       int    $size   A file size
1185 * @param       int    $dec    A number of decimal places
1186 * @author      Martin Benjamin <b.martin@cybernet.ch>
1187 * @author      Aidan Lister <aidan@php.net>
1188 * @version     1.0.0
1189 */
1190function filesize_h($size, $dec = 1) {
1191    $sizes = array('B', 'KB', 'MB', 'GB');
1192    $count = count($sizes);
1193    $i     = 0;
1194
1195    while($size >= 1024 && ($i < $count - 1)) {
1196        $size /= 1024;
1197        $i++;
1198    }
1199
1200    return round($size, $dec).' '.$sizes[$i];
1201}
1202
1203/**
1204 * Return the given timestamp as human readable, fuzzy age
1205 *
1206 * @author Andreas Gohr <gohr@cosmocode.de>
1207 */
1208function datetime_h($dt) {
1209    global $lang;
1210
1211    $ago = time() - $dt;
1212    if($ago > 24 * 60 * 60 * 30 * 12 * 2) {
1213        return sprintf($lang['years'], round($ago / (24 * 60 * 60 * 30 * 12)));
1214    }
1215    if($ago > 24 * 60 * 60 * 30 * 2) {
1216        return sprintf($lang['months'], round($ago / (24 * 60 * 60 * 30)));
1217    }
1218    if($ago > 24 * 60 * 60 * 7 * 2) {
1219        return sprintf($lang['weeks'], round($ago / (24 * 60 * 60 * 7)));
1220    }
1221    if($ago > 24 * 60 * 60 * 2) {
1222        return sprintf($lang['days'], round($ago / (24 * 60 * 60)));
1223    }
1224    if($ago > 60 * 60 * 2) {
1225        return sprintf($lang['hours'], round($ago / (60 * 60)));
1226    }
1227    if($ago > 60 * 2) {
1228        return sprintf($lang['minutes'], round($ago / (60)));
1229    }
1230    return sprintf($lang['seconds'], $ago);
1231}
1232
1233/**
1234 * Wraps around strftime but provides support for fuzzy dates
1235 *
1236 * The format default to $conf['dformat']. It is passed to
1237 * strftime - %f can be used to get the value from datetime_h()
1238 *
1239 * @see datetime_h
1240 * @author Andreas Gohr <gohr@cosmocode.de>
1241 */
1242function dformat($dt = null, $format = '') {
1243    global $conf;
1244
1245    if(is_null($dt)) $dt = time();
1246    $dt = (int) $dt;
1247    if(!$format) $format = $conf['dformat'];
1248
1249    $format = str_replace('%f', datetime_h($dt), $format);
1250    return strftime($format, $dt);
1251}
1252
1253/**
1254 * Formats a timestamp as ISO 8601 date
1255 *
1256 * @author <ungu at terong dot com>
1257 * @link http://www.php.net/manual/en/function.date.php#54072
1258 * @param int $int_date: current date in UNIX timestamp
1259 * @return string
1260 */
1261function date_iso8601($int_date) {
1262    $date_mod     = date('Y-m-d\TH:i:s', $int_date);
1263    $pre_timezone = date('O', $int_date);
1264    $time_zone    = substr($pre_timezone, 0, 3).":".substr($pre_timezone, 3, 2);
1265    $date_mod .= $time_zone;
1266    return $date_mod;
1267}
1268
1269/**
1270 * return an obfuscated email address in line with $conf['mailguard'] setting
1271 *
1272 * @author Harry Fuecks <hfuecks@gmail.com>
1273 * @author Christopher Smith <chris@jalakai.co.uk>
1274 */
1275function obfuscate($email) {
1276    global $conf;
1277
1278    switch($conf['mailguard']) {
1279        case 'visible' :
1280            $obfuscate = array('@' => ' [at] ', '.' => ' [dot] ', '-' => ' [dash] ');
1281            return strtr($email, $obfuscate);
1282
1283        case 'hex' :
1284            $encode = '';
1285            $len    = strlen($email);
1286            for($x = 0; $x < $len; $x++) {
1287                $encode .= '&#x'.bin2hex($email{$x}).';';
1288            }
1289            return $encode;
1290
1291        case 'none' :
1292        default :
1293            return $email;
1294    }
1295}
1296
1297/**
1298 * Removes quoting backslashes
1299 *
1300 * @author Andreas Gohr <andi@splitbrain.org>
1301 */
1302function unslash($string, $char = "'") {
1303    return str_replace('\\'.$char, $char, $string);
1304}
1305
1306/**
1307 * Convert php.ini shorthands to byte
1308 *
1309 * @author <gilthans dot NO dot SPAM at gmail dot com>
1310 * @link   http://de3.php.net/manual/en/ini.core.php#79564
1311 */
1312function php_to_byte($v) {
1313    $l   = substr($v, -1);
1314    $ret = substr($v, 0, -1);
1315    switch(strtoupper($l)) {
1316        case 'P':
1317            $ret *= 1024;
1318        case 'T':
1319            $ret *= 1024;
1320        case 'G':
1321            $ret *= 1024;
1322        case 'M':
1323            $ret *= 1024;
1324        case 'K':
1325            $ret *= 1024;
1326            break;
1327        default;
1328            $ret *= 10;
1329            break;
1330    }
1331    return $ret;
1332}
1333
1334/**
1335 * Wrapper around preg_quote adding the default delimiter
1336 */
1337function preg_quote_cb($string) {
1338    return preg_quote($string, '/');
1339}
1340
1341/**
1342 * Shorten a given string by removing data from the middle
1343 *
1344 * You can give the string in two parts, the first part $keep
1345 * will never be shortened. The second part $short will be cut
1346 * in the middle to shorten but only if at least $min chars are
1347 * left to display it. Otherwise it will be left off.
1348 *
1349 * @param string $keep   the part to keep
1350 * @param string $short  the part to shorten
1351 * @param int    $max    maximum chars you want for the whole string
1352 * @param int    $min    minimum number of chars to have left for middle shortening
1353 * @param string $char   the shortening character to use
1354 * @return string
1355 */
1356function shorten($keep, $short, $max, $min = 9, $char = '…') {
1357    $max = $max - utf8_strlen($keep);
1358    if($max < $min) return $keep;
1359    $len = utf8_strlen($short);
1360    if($len <= $max) return $keep.$short;
1361    $half = floor($max / 2);
1362    return $keep.utf8_substr($short, 0, $half - 1).$char.utf8_substr($short, $len - $half);
1363}
1364
1365/**
1366 * Return the users realname or e-mail address for use
1367 * in page footer and recent changes pages
1368 *
1369 * @author Andy Webber <dokuwiki AT andywebber DOT com>
1370 */
1371function editorinfo($username) {
1372    global $conf;
1373    global $auth;
1374
1375    switch($conf['showuseras']) {
1376        case 'username':
1377        case 'email':
1378        case 'email_link':
1379            if($auth) $info = $auth->getUserData($username);
1380            break;
1381        default:
1382            return hsc($username);
1383    }
1384
1385    if(isset($info) && $info) {
1386        switch($conf['showuseras']) {
1387            case 'username':
1388                return hsc($info['name']);
1389            case 'email':
1390                return obfuscate($info['mail']);
1391            case 'email_link':
1392                $mail = obfuscate($info['mail']);
1393                return '<a href="mailto:'.$mail.'">'.$mail.'</a>';
1394            default:
1395                return hsc($username);
1396        }
1397    } else {
1398        return hsc($username);
1399    }
1400}
1401
1402/**
1403 * Returns the path to a image file for the currently chosen license.
1404 * When no image exists, returns an empty string
1405 *
1406 * @author Andreas Gohr <andi@splitbrain.org>
1407 * @param  string $type - type of image 'badge' or 'button'
1408 * @return string
1409 */
1410function license_img($type) {
1411    global $license;
1412    global $conf;
1413    if(!$conf['license']) return '';
1414    if(!is_array($license[$conf['license']])) return '';
1415    $lic   = $license[$conf['license']];
1416    $try   = array();
1417    $try[] = 'lib/images/license/'.$type.'/'.$conf['license'].'.png';
1418    $try[] = 'lib/images/license/'.$type.'/'.$conf['license'].'.gif';
1419    if(substr($conf['license'], 0, 3) == 'cc-') {
1420        $try[] = 'lib/images/license/'.$type.'/cc.png';
1421    }
1422    foreach($try as $src) {
1423        if(@file_exists(DOKU_INC.$src)) return $src;
1424    }
1425    return '';
1426}
1427
1428/**
1429 * Checks if the given amount of memory is available
1430 *
1431 * If the memory_get_usage() function is not available the
1432 * function just assumes $bytes of already allocated memory
1433 *
1434 * @author Filip Oscadal <webmaster@illusionsoftworks.cz>
1435 * @author Andreas Gohr <andi@splitbrain.org>
1436 *
1437 * @param  int $mem  Size of memory you want to allocate in bytes
1438 * @param int  $bytes
1439 * @internal param int $used already allocated memory (see above)
1440 * @return bool
1441 */
1442function is_mem_available($mem, $bytes = 1048576) {
1443    $limit = trim(ini_get('memory_limit'));
1444    if(empty($limit)) return true; // no limit set!
1445
1446    // parse limit to bytes
1447    $limit = php_to_byte($limit);
1448
1449    // get used memory if possible
1450    if(function_exists('memory_get_usage')) {
1451        $used = memory_get_usage();
1452    } else {
1453        $used = $bytes;
1454    }
1455
1456    if($used + $mem > $limit) {
1457        return false;
1458    }
1459
1460    return true;
1461}
1462
1463/**
1464 * Send a HTTP redirect to the browser
1465 *
1466 * Works arround Microsoft IIS cookie sending bug. Exits the script.
1467 *
1468 * @link   http://support.microsoft.com/kb/q176113/
1469 * @author Andreas Gohr <andi@splitbrain.org>
1470 */
1471function send_redirect($url) {
1472    //are there any undisplayed messages? keep them in session for display
1473    global $MSG;
1474    if(isset($MSG) && count($MSG) && !defined('NOSESSION')) {
1475        //reopen session, store data and close session again
1476        @session_start();
1477        $_SESSION[DOKU_COOKIE]['msg'] = $MSG;
1478    }
1479
1480    // always close the session
1481    session_write_close();
1482
1483    // work around IE bug
1484    // http://www.ianhoar.com/2008/11/16/internet-explorer-6-and-redirected-anchor-links/
1485    list($url, $hash) = explode('#', $url);
1486    if($hash) {
1487        if(strpos($url, '?')) {
1488            $url = $url.'&#'.$hash;
1489        } else {
1490            $url = $url.'?&#'.$hash;
1491        }
1492    }
1493
1494    // check if running on IIS < 6 with CGI-PHP
1495    if(isset($_SERVER['SERVER_SOFTWARE']) && isset($_SERVER['GATEWAY_INTERFACE']) &&
1496        (strpos($_SERVER['GATEWAY_INTERFACE'], 'CGI') !== false) &&
1497        (preg_match('|^Microsoft-IIS/(\d)\.\d$|', trim($_SERVER['SERVER_SOFTWARE']), $matches)) &&
1498        $matches[1] < 6
1499    ) {
1500        header('Refresh: 0;url='.$url);
1501    } else {
1502        header('Location: '.$url);
1503    }
1504    exit;
1505}
1506
1507/**
1508 * Validate a value using a set of valid values
1509 *
1510 * This function checks whether a specified value is set and in the array
1511 * $valid_values. If not, the function returns a default value or, if no
1512 * default is specified, throws an exception.
1513 *
1514 * @param string $param        The name of the parameter
1515 * @param array  $valid_values A set of valid values; Optionally a default may
1516 *                             be marked by the key “default”.
1517 * @param array  $array        The array containing the value (typically $_POST
1518 *                             or $_GET)
1519 * @param string $exc          The text of the raised exception
1520 *
1521 * @throws Exception
1522 * @return mixed
1523 * @author Adrian Lang <lang@cosmocode.de>
1524 */
1525function valid_input_set($param, $valid_values, $array, $exc = '') {
1526    if(isset($array[$param]) && in_array($array[$param], $valid_values)) {
1527        return $array[$param];
1528    } elseif(isset($valid_values['default'])) {
1529        return $valid_values['default'];
1530    } else {
1531        throw new Exception($exc);
1532    }
1533}
1534
1535/**
1536 * Read a preference from the DokuWiki cookie
1537 * (remembering both keys & values are urlencoded)
1538 */
1539function get_doku_pref($pref, $default) {
1540    $enc_pref = urlencode($pref);
1541    if(strpos($_COOKIE['DOKU_PREFS'], $enc_pref) !== false) {
1542        $parts = explode('#', $_COOKIE['DOKU_PREFS']);
1543        $cnt   = count($parts);
1544        for($i = 0; $i < $cnt; $i += 2) {
1545            if($parts[$i] == $enc_pref) {
1546                return urldecode($parts[$i + 1]);
1547            }
1548        }
1549    }
1550    return $default;
1551}
1552
1553/**
1554 * Add a preference to the DokuWiki cookie
1555 * (remembering $_COOKIE['DOKU_PREFS'] is urlencoded)
1556 */
1557function set_doku_pref($pref, $val) {
1558    global $conf;
1559    $orig = get_doku_pref($pref, false);
1560    $cookieVal = '';
1561
1562    if($orig && ($orig != $val)) {
1563        $parts = explode('#', $_COOKIE['DOKU_PREFS']);
1564        $cnt   = count($parts);
1565        // urlencode $pref for the comparison
1566        $enc_pref = rawurlencode($pref);
1567        for($i = 0; $i < $cnt; $i += 2) {
1568            if($parts[$i] == $enc_pref) {
1569                $parts[$i + 1] = rawurlencode($val);
1570                break;
1571            }
1572        }
1573        $cookieVal = implode('#', $parts);
1574    } else if (!$orig) {
1575        $cookieVal = ($_COOKIE['DOKU_PREFS'] ? $_COOKIE['DOKU_PREFS'].'#' : '').rawurlencode($pref).'#'.rawurlencode($val);
1576    }
1577
1578    if (!empty($cookieVal)) {
1579        setcookie('DOKU_PREFS', $cookieVal, time()+365*24*3600, DOKU_BASE, '', ($conf['securecookie'] && is_ssl()));
1580    }
1581}
1582
1583//Setup VIM: ex: et ts=2 :
1584