mahara.php 76.4 KB
Newer Older
1
2
<?php
/**
Francois Marier's avatar
Francois Marier committed
3
 * Mahara: Electronic portfolio, weblog, resume builder and social networking
4
5
 * Copyright (C) 2006-2009 Catalyst IT Ltd and others; see:
 *                         http://wiki.mahara.org/Contributors
6
 *
Francois Marier's avatar
Francois Marier committed
7
8
9
10
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
11
 *
Francois Marier's avatar
Francois Marier committed
12
13
14
15
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
16
 *
Francois Marier's avatar
Francois Marier committed
17
18
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
19
20
21
 *
 * @package    mahara
 * @subpackage core
22
 * @author     Catalyst IT Ltd
23
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
24
 * @copyright  (C) 2006-2009 Catalyst IT Ltd http://catalyst.net.nz
25
 * @copyright  (C) portions from Moodle, (C) Martin Dougiamas http://dougiamas.com
26
27
 */

28
defined('INTERNAL') || die();
29

30
31
32
33
34
35
36
/** 
 * work around silly php settings
 * and broken setup stuff about the install
 * and raise a warning/fail depending on severity
 */
function ensure_sanity() {

37
    // PHP version
38
    if (version_compare(phpversion(), '5.1.3') < 0) {
39
40
41
42
43
44
45
        throw new ConfigSanityException(get_string('phpversion', 'error'));
    }

    // Various required extensions
    if (!extension_loaded('json')) {
        throw new ConfigSanityException(get_string('jsonextensionnotloaded', 'error'));
    }
46
47
48
49
50
51
    switch (get_config('dbtype')) {
    case 'postgres8':
        if (!extension_loaded('pgsql')) {
            throw new ConfigSanityException(get_string('pgsqldbextensionnotloaded', 'error'));
        }
        break;
52
    case 'mysql5':
53
54
55
56
57
58
        if (!extension_loaded('mysql')) {
            throw new ConfigSanityException(get_string('mysqldbextensionnotloaded', 'error'));
        }
        break;
    default:
        throw new ConfigSanityException(get_string('unknowndbtype', 'error'));
59
    }
60
61
62
    if (!extension_loaded('xml')) {
        throw new ConfigSanityException(get_string('xmlextensionnotloaded', 'error', 'xml'));
    }
63
    if (!extension_loaded('libxml')) {
64
        throw new ConfigSanityException(get_string('xmlextensionnotloaded', 'error', 'libxml'));
65
66
67
68
69
70
71
72
    }
    if (!extension_loaded('gd')) {
        throw new ConfigSanityException(get_string('gdextensionnotloaded', 'error'));
    }
    if (!extension_loaded('session')) {
        throw new ConfigSanityException(get_string('sessionextensionnotloaded', 'error'));
    }

73
74
75
    if(!extension_loaded('curl')) {
        throw new ConfigSanityException(get_string('curllibrarynotinstalled', 'error'));
    }
76
77
78
    if (!extension_loaded('dom')) {
        throw new ConfigSanityException(get_string('domextensionnotloaded', 'error'));
    }
79

80
81
82
83
84
85
    //Check for freetype in the gd extension
    $gd_info = gd_info();
    if (!$gd_info['FreeType Support']) {
        throw new ConfigSanityException(get_string('gdfreetypenotloaded', 'error'));
    }

86
87
    // register globals workaround
    if (ini_get_bool('register_globals')) {
88
        log_environ(get_string('registerglobals', 'error'));
89
        $massivearray = array_keys(array_merge($_POST, $_GET, $_COOKIE, $_SERVER, $_REQUEST, $_FILES));
90
91
92
93
94
95
        foreach ($massivearray as $tounset) {
            unset($GLOBALS[$tounset]);
        }
    }

    // magic_quotes_gpc workaround
96
    if (!defined('CRON') && ini_get_bool('magic_quotes_gpc')) {
97
        log_environ(get_string('magicquotesgpc', 'error'));
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
        function stripslashes_deep($value) {
            $value = is_array($value) ?
                array_map('stripslashes_deep', $value) :
                stripslashes($value);
            return $value;
        }
        $_POST = array_map('stripslashes_deep', $_POST);
        $_GET = array_map('stripslashes_deep', $_GET);
        $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
        $_REQUEST = array_map('stripslashes_deep', $_REQUEST);

        $servervars = array('REQUEST_URI','QUERY_STRING','HTTP_REFERER','PATH_INFO','PHP_SELF','PATH_TRANSLATED');
        foreach ($servervars as $tocheck) {
            if (array_key_exists($tocheck,$_SERVER) && !empty($_SERVER[$tocheck])) {
                $_SERVER[$tocheck] = stripslashes($_SERVER[$tocheck]);
            }
        }
    }

117
    if (ini_get_bool('magic_quotes_runtime')) {
118
119
120
121
122
123
124
125
126
        // Turn of magic_quotes_runtime. Anyone with this on deserves a slap in the face
        set_magic_quotes_runtime(0);
        log_environ(get_string('magicquotesruntime', 'error'));
    }

    if (ini_get_bool('magic_quotes_sybase')) {
        // See above comment re. magic_quotes_runtime
        @ini_set('magic_quotes_sybase', 0);
        log_environ(get_string('magicquotessybase', 'error'));
127
128
    }

129
130
131
    if (ini_get_bool('safe_mode')) {
        // We don't run with safe mode
        throw new ConfigSanityException(get_string('safemodeon', 'error'));
132
133
    }

134
135
136
137
138
139
140
    // Other things that might be worth checking:
    //    memory limit
    //    file_uploads (off|on)
    //    upload_max_filesize
    //    allow_url_fopen (only if we use this)
    //

141
    // dataroot inside document root.
142
143
    if (strpos(get_config('dataroot'), get_config('docroot')) !== false) {
        throw new ConfigSanityException(get_string('datarootinsidedocroot', 'error'));
144
145
    }

146
147
    // dataroot not writable..
    if (!check_dir_exists(get_config('dataroot')) || !is_writable(get_config('dataroot'))) {
148
        throw new ConfigSanityException(get_string('datarootnotwritable', 'error', get_config('dataroot')));
149
    }
150

151
152
153
    if (
        !check_dir_exists(get_config('dataroot') . 'smarty/compile') ||
        !check_dir_exists(get_config('dataroot') . 'smarty/cache') ||
154
        !check_dir_exists(get_config('dataroot') . 'sessions') ||
155
        !check_dir_exists(get_config('dataroot') . 'temp') ||
156
        !check_dir_exists(get_config('dataroot') . 'langpacks') ||
157
        !check_dir_exists(get_config('dataroot') . 'htmlpurifier')) {
158
159
        throw new ConfigSanityException(get_string('couldnotmakedatadirectories', 'error'));
    }
160

161
    raise_memory_limit('128M');
162
163
}

164
165
166
167
168
169
170
171
172
173
174
/**
 * Check sanity of things that we only check at installation time - not on 
 * every request, like ensure_sanity() does
 */
function ensure_install_sanity() {
    // Must must must be a UTF8 database!
    if (!db_is_utf8()) {
        throw new ConfigSanityException(get_string('dbnotutf8', 'error'));
    }
}

175
176
177
178
179
180
181
182
183
184
185
186
function ensure_upgrade_sanity() {
    // Check column collation is equal to the default
    if (is_mysql()) {
        require_once('ddl.php');
        if (table_exists(new XMLDBTable('event_type'))) {
            if (!column_collation_is_default('event_type', 'name')) {
                throw new ConfigSanityException(get_string('dbcollationmismatch', 'admin'));
            }
        }
    }
}

187
188
189
190
191
/**
 * Check to see if the internal plugins are installed. Die if they are not.
 */
function ensure_internal_plugins_exist() {
    // Internal things installed
192
    if (get_config('installed')) {
193
194
195
196
197
198
199
200
        foreach (plugin_types() as $type) {
            if (!record_exists($type . '_installed', 'name', 'internal')) {
                throw new ConfigSanityException(get_string($type . 'notinstalled'));
            }
        }
    }
}

201
function get_string($identifier, $section='mahara') {
202
203
204
205
206

    $variables = func_get_args();
    if (count($variables) > 2) { // we have some stuff we need to sprintf
        array_shift($variables);
        array_shift($variables); //shift off the first two.
207
208
    }
    else {
209
210
211
        $variables = array();
    }
    
212
213
214
    return get_string_location($identifier, $section, $variables);
}

215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
function get_string_from_language($lang, $identifier, $section='mahara') {

    $variables = func_get_args();
    if (count($variables) > 3) { // we have some stuff we need to sprintf
        array_shift($variables);
        array_shift($variables);
        array_shift($variables); //shift off the first three.
    }
    else {
        $variables = array();
    }
    
    return get_string_location($identifier, $section, $variables, 'format_langstring', $lang);
}

230
231
232
233
234
235
236
237
238
239
240
241
function get_helpfile($plugintype, $pluginname, $form, $element, $page=null, $section=null) {
    if ($langfile = get_helpfile_location($plugintype, $pluginname, $form, $element, $page, $section)) {
        return file_get_contents($langfile);
    }
    return false;
}

function get_helpfile_location($plugintype, $pluginname, $form, $element, $page=null, $section=null) {

    $file = 'help/';

    if ($plugintype != 'core') {
242
        $location = $plugintype . '/' . $pluginname . '/lang/';
243
244
    }
    else {
245
        $location = 'lang/';
246
247
248
    }
    if ($page) {
        $page = str_replace('-', '/', $page);
249
250
251
252
253
254
        if ($plugintype != 'core') {
            $file .=  'pages/' . $page . '.html';
        }
        else {
            $file .= 'pages/' . $pluginname . '/' . $page . '.html';
        } 
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
    }
    else if ($section) {
        $file .= 'sections/' . $section . '.html';
    }
    else if (!empty($form) && !empty($element)) {
        $file .= 'forms/' . $form . '.' . $element . '.html';
    }
    else if (!empty($form) && empty($element)) {
        $file .= 'forms/' . $form . '.html';
    }
    else {
        return false;
    }

    // now we have to try and locate the help file
    $lang = current_language();
    if ($lang == 'en.utf8') {
        $trieden = true;
    }
    else {
        $trieden = false;
    }

278
279
280
281
282
283
    //try the local settings
    $langfile = get_config('docroot') . 'local/' . $location . $lang . '/' . $file;
    if (is_readable($langfile)) {
        return $langfile;
    }

284
    // try the current language
285
    $langfile = get_language_root() . $location . $lang . '/' . $file;
286
287
288
289
290
291
    if (is_readable($langfile)) {
        return $langfile;
    }

    // if it's not found, try the parent language if there is one...
    if (empty($data) && empty($trieden)) {
292
        $langfile = get_language_root($lang) . 'lang/' . $lang . '/langconfig.php';
293
294
295
296
        if ($parentlang = get_string_from_file('parentlanguage', $langfile)) {
            if ($parentlang == 'en.utf8') {
                $trieden = true;
            }
297
            $langfile = get_language_root($parentlang) . $location . $parentlang . '/' . $file;
298
299
300
301
302
303
304
305
            if (is_readable($langfile)) {
                return $langfile;
            }
        }
    }

    // if it's STILL not found, and we haven't already tried english ...
    if (empty($data) && empty($trieden)) {
306
        $langfile = get_language_root('en.utf8') . $location . 'en.utf8/' . $file;
307
308
309
310
311
312
313
        if (is_readable($langfile)) {
            return $langfile;
        }
    }
    return false;
}

314
315
316
317
318
// get a string without sprintfing it.
function get_raw_string($identifier, $section='mahara') {
    // For a raw string we don't want to format any arguments using
    // sprintf, so the replace function passed to get_string_location
    // should just return the first argument and ignore the second.
319
320
    return get_string_location($identifier, $section, array(), 
                               create_function('$string, $args','return $string;'));
321
322
323
324
325
326
327
328
329
330
331
332
333
334
}


/**
 * This function gets a language string identified by $identifier from
 * an appropriate location, and formats the string and any arguments
 * in $variables using the function $replacefunc.
 *
 * @param string   $identifier
 * @param string   $section
 * @param array    $variables
 * @param function $replacefunc
 * @return string
 */
335
function get_string_location($identifier, $section, $variables, $replacefunc='format_langstring', $lang='') {
336

337
    $langconfigstrs = array('parentlanguage', 'thislanguage');
338

339
340
341
342
    if ($section == 'mahara' &&
        (in_array($identifier, $langconfigstrs)
         || strpos($identifier, 'strftime') === 0
         || strpos($identifier, 'strfday')  === 0)) {
343
344
345
        $section = 'langconfig';
    }

346
347
348
    if (empty($lang)) {
        $lang = current_language();
    }
349
350

    // Define the locations of language strings for this section
351
    $langstringroot = get_language_root($lang);
352
    $langdirectory  = ''; // The directory in which the language file for this string should ideally reside, if the language has implemented it
353
    
354
    if (false === strpos($section, '.')) {
355
        $langdirectory = 'lang/';
356
357
358
    }
    else {
        $extras = plugin_types(); // more later..
359
        foreach ($extras as $tocheck) {
360
            if (strpos($section, $tocheck . '.') === 0) {
Nigel McNie's avatar
Nigel McNie committed
361
                $pluginname = substr($section ,strlen($tocheck) + 1);
362
363
364
                if ($tocheck == 'blocktype' && 
                    strpos($pluginname, '/') !== false) { // it belongs to an artefact plugin
                    $bits = explode('/', $pluginname);
365
                    $langdirectory = 'artefact/' . $bits[0] . '/blocktype/' . $bits[1] . '/lang/';
366
                    $section = 'blocktype.' . $bits[1];
367
368
                }
                else {
369
                    $langdirectory = $tocheck . '/' . $pluginname . '/lang/';
370
                }
371
372
373
            }
        }
    }
374

375
    // First check all the normal locations for the string in the current language
376
377
    if ($result = get_string_local($langstringroot . $langdirectory, $lang . '/' . $section . '.php', $identifier)) {
        return $replacefunc($result, $variables);
378
379
380
381
382
    }

    // If the preferred language was English (utf8) we can abort now
    // saving some checks beacuse it's the only "root" lang
    if ($lang == 'en.utf8') {
383
        return '[[' . $identifier . '/' . $section . ']]';
384
385
386
    }

    // Is a parent language defined?  If so, try to find this string in a parent language file
387
388
389
    $langfile = $langstringroot . 'lang/' . $lang . '/langconfig.php';
    if (is_readable($langfile)) {
        if ($parentlang = get_string_from_file('parentlanguage', $langfile)) {
390
391
            if ($result = get_string_local(get_language_root($parentlang) . 'lang/', $parentlang . '/' . $section . '.php', $identifier)) {
                return $replacefunc($result, $variables);
392
393
394
395
396
            }
        }
    }

    /// Our only remaining option is to try English
397
398
    if ($result = get_string_local(get_config('docroot') . $langdirectory, 'en.utf8/' . $section . '.php', $identifier)) {
        return $replacefunc($result, $variables);
399
400
    }

401
    return '[[' . $identifier . '/' . $section . ']]';  // Last resort
402
}
403
404


405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
/**
 * Get string from a file, checking the appropriate local customisation directory first
 *
 */
function get_string_local($langpath, $langfile, $identifier) {
    foreach (array(get_config('docroot') . 'local/lang/', $langpath) as $dir) {
        $file = $dir . $langfile;
        if (is_readable($file)) {
            if ($result = get_string_from_file($identifier, $file)) {
                return $result;
            }
        }
    }
    return false;
}


422
423
424
425
426
/**
 * Return a list of available languages
 *
 */
function get_languages() {
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
    static $langs = array();

    if (!$langs) {
        foreach (language_get_searchpaths() as $searchpath) {
            $langbase = $searchpath . 'lang/';
            if ($langdir = @opendir($langbase)) {
                while (false !== ($subdir = readdir($langdir))) {
                    if (preg_match('/\.utf8$/', $subdir) && is_dir($langbase . $subdir)) {
                        $langfile = $langbase . $subdir . '/langconfig.php';
                        if (is_readable($langfile)) {
                            if ($langname = get_string_from_file('thislanguage', $langfile)) {
                                $langs[$subdir] = $langname;
                            }
                        }
                    }
442
                }
443
444
445
446
                closedir($langdir);
            }
            else {
                log_warn('Unable to read language directory ' . $langbase);
447
448
449
            }
        }
    }
450

451
452
453
    return $langs;
}

454
455
456
/**
 * Returns whether the given language is installed/available for use
 */
457
function language_installed($lang) {
458
459
460
461
462
463
    foreach (language_get_searchpaths() as $searchpath) {
        if (is_readable($searchpath . 'lang/' . $lang . '/langconfig.php')) {
            return true;
        }
    }
    return false;
464
465
}

466
467
468
469
470
471
472
473
474
/**
 * Returns a list of directories in which to search for language packs.
 *
 * This is influenced by the configuration variable 'langpacksearchpaths'
 */
function language_get_searchpaths() {
    static $searchpaths = array();

    if (!$searchpaths) {
475
476
477
478
        // Construct the search path
        $docrootpath = array(get_config('docroot'));

        // Paths to language files in dataroot
479
        $datarootpaths = (array)glob(get_config('dataroot') . 'langpacks/*.utf8', GLOB_MARK | GLOB_ONLYDIR);
480
481
482
483
484
485
486
487
488
489

        // langpacksearchpaths configuration variable - for experts :)
        $lpsearchpaths = (array)get_config('langpacksearchpaths');
        $langpacksearchpaths = array();
        foreach ($lpsearchpaths as $path) {
            if (is_dir($path)) {
                $langpacksearchpaths[] = (substr($path, -1) == '/') ? $path : "$path/";
            }
            else {
                log_warn("Path in langpacksearchpaths is not a directory: $path");
490
            }
491
        }
492
493

        $searchpaths = array_merge($docrootpath, $datarootpaths, $langpacksearchpaths);
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
    }

    return $searchpaths;
}

/**
 * Get the directory in which the specified language pack resides.
 *
 * Defaults to getting the directory for the current_language() - i.e. the 
 * language the user is using
 *
 * Returns null if the language can't be found
 *
 * @param string $language The language to look for
 */
function get_language_root($language=null) {
    static $language_root_cache = array();

    if (!isset($language_root_cache[$language])) {
        if ($language == null) {
            $language = current_language();
        }

        foreach (language_get_searchpaths() as $path) {
            if (is_dir("$path/lang/$language")) {
                return $language_root_cache[$language] = $path;
            }
        }

        // Oh noes, can't be found
        $language_root_cache[$language] = null;

    }

    return $language_root_cache[$language];
}

531
/**
532
 * Return a list of all available themes.
533
 * @return array subdir => name
534
 */
535
function get_all_themes() {
536
537
    static $themes = null;

538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
    if (is_null($themes)) {
        $themes = array();
        $themelist = get_all_theme_objects();
        foreach ($themelist AS $subdir => $theme) {
            $themes[$subdir] = isset($theme->displayname) ? $theme->displayname : $subdir;
        }
    }

    return $themes;
}

/**
 * Return a list of themes available to this user
 * If the user is a member of any institutions, only themes available to
 * those institutions are returned; or
 * If a user is not a member of any institution, all themes not marked as
 * institution specific are returned.
 * @return array subdir => name
 */
557
function get_user_accessible_themes() {
558
559
560
561
562
563
    global $USER;

    $themes = array();
    if ($institutions = $USER->get('institutions')) {
        // Get themes for all of this users institutions
        foreach ($institutions AS $i) {
564
            $themes = array_merge($themes, get_institution_themes($i->institution));
565
566
        }
    }
567
568
569
    else {
        $themelist = get_all_theme_objects();
        foreach ($themelist AS $subdir => $theme) {
570
            if (!isset($theme->institutions) || !is_array($theme->institutions)) {
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
                $themes[$subdir] = isset($theme->displayname) ? $theme->displayname : $subdir;
            }
        }

    }
    return $themes;
}

/**
 * Return a list of themes available to the specified institution
 * @param string institution the name of the institution to load themes for
 * @return array subdir => name
 * @throws SystemException if unable to read the theme directory
 */
function get_institution_themes($institution) {
    static $institutionthemes = array();
    if (!isset($institutionthemes[$institution])) {
        $themes = get_all_theme_objects();
        $r = array();
        foreach ($themes AS $subdir => $theme) {
591
            if (empty($theme->institutions) || !is_array($theme->institutions) || in_array($institution, $theme->institutions)) {
592
                $r[$subdir] = isset($theme->displayname) ? $theme->displayname : $subdir;
593
594
            }
        }
595
        $institutionthemes[$institution] = $r;
596
597
    }

598
599
600
601
602
603
604
605
606
607
    return $institutionthemes[$institution];
}

/**
 * Return a list of all themes available on the system
 * @return array An array of theme objects
 * @throws SystemException if unable to read the theme directory
 */
function get_all_theme_objects() {
    static $themes = null;
608

609
610
611
612
613
614
615
616
617
618
619
    if (is_null($themes)) {
        $themes = array();
        $themebase = get_config('docroot') . 'theme/';
        if (!$themedir = opendir($themebase)) {
            throw new SystemException('Unable to read theme directory '.$themebase);
        }
        while (false !== ($subdir = readdir($themedir))) {
            if ($subdir != "." && $subdir != ".." && is_dir($themebase . $subdir)) {
                $config_path = $themebase . $subdir . '/themeconfig.php';
                if (is_readable($config_path)) {
                    require($config_path);
620
621
                    if (empty($theme->disabled) || !$theme->disabled) {
                        $themes[$subdir] = $theme;
622
                    }
623
                }
624
            }
625
        }
626
        closedir($themedir);
627
    }
628

629
630
631
632
    return $themes;
}


633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
/**
 * This function is only used from {@link get_string()}.
 *
 * @internal Only used from get_string, not meant to be public API
 * @param string $identifier ?
 * @param string $langfile ?
 * @param string $destination ?
 * @return string|false ?
 * @staticvar array $strings Localized strings
 * @access private
 * @todo Finish documenting this function.
 */
function get_string_from_file($identifier, $langfile) {

    static $strings;    // Keep the strings cached in memory.

    if (empty($strings[$langfile])) {
        $string = array();
        include ($langfile);
        $strings[$langfile] = $string;
    } else {
        $string = &$strings[$langfile];
    }

    if (!isset ($string[$identifier])) {
        return false;
    }

    return $string[$identifier];
}

/**
 * This function makes the return value of ini_get consistent if you are
 * setting server directives through the .htaccess file in apache.
 * Current behavior for value set from php.ini On = 1, Off = [blank]
 * Current behavior for value set from .htaccess On = On, Off = Off
 * Contributed by jdell @ unr.edu
 *
671
 * @param string $ini_get_arg setting to look for
672
673
674
675
676
677
678
679
680
681
682
 * @return bool
 */
function ini_get_bool($ini_get_arg) {
    $temp = ini_get($ini_get_arg);

    if ($temp == '1' or strtolower($temp) == 'on') {
        return true;
    }
    return false;
}

683
684
685
686
687
688
689
690
691
692
/**
 * This function loads up the basic $CFG
 * from the database table
 * note that it doesn't load plugin config
 * as not every page needs them
 * @return boolean false if the assignment fails (generally if the databse is not installed)
 */
function load_config() {
    global $CFG;
    
693
    $dbconfig = get_records_array('config', '', '', '', 'field, value');
694
695
    
    foreach ($dbconfig as $cfg) {
696
        if (isset($CFG->{$cfg->field}) && $CFG->{$cfg->field} != $cfg->value) {
Penny Leach's avatar
Penny Leach committed
697
            // @todo warn that we're overriding db config with $CFG
698
699
700
701
702
703
704
705
706
            continue;
        }
        $CFG->{$cfg->field} = $cfg->value;
    }

    return true;
}

/**
707
708
709
710
711
712
 * This function returns a value from $CFG
 * or null if it is not found
 * 
 * @param string $key config setting to look for 
 * @return mixed
 */
713
714
function get_config($key) {
    global $CFG;
715
    if (isset($CFG->$key)) {
716
717
718
719
720
        return $CFG->$key;
    }
    return null;
}

721
722
723
724
725
726
727
728
729

/**
 * This function sets a config variable
 * both in $CFG and in the database
 *
 * @param string $key config field to set
 * @param string $value config value
 */
function set_config($key, $value) {
730
731
    global $CFG;

732
    db_ignore_sql_exceptions(true);
733
734
    if (get_record('config', 'field', $key)) {
        if (set_field('config', 'value', $value, 'field', $key)) {
Penny Leach's avatar
Penny Leach committed
735
736
737
738
739
740
741
            $status = true;
        }
    } 
    else {
        $config = new StdClass;
        $config->field = $key;
        $config->value = $value;
742
        $status = insert_record('config', $config);
Penny Leach's avatar
Penny Leach committed
743
    }
744
    db_ignore_sql_exceptions(false);
Penny Leach's avatar
Penny Leach committed
745
746

    if (!empty($status)) {
747
748
749
        $CFG->{$key} = $value;
        return true;
    }
Penny Leach's avatar
Penny Leach committed
750

751
752
753
754
755
756
757
758
759
760
761
762
763
764
    return false;
}

/**
 * This function returns a value for $CFG for a plugin
 * or null if it is not found
 * note that it may go and look in the database
 *
 * @param string $plugintype eg artefact
 * @param string $pluginname eg blog
 * @param string $key the config setting to look for
 */
function get_config_plugin($plugintype, $pluginname, $key) {
    global $CFG;
765

766
767
    // Suppress NOTICE with @ in case $key is not yet cached
    @$value = $CFG->plugin->{$plugintype}->{$pluginname}->{$key};
768
    if (isset($value)) {
769
770
771
772
        return $value;
    }

    $records = get_records_array($plugintype . '_config', 'plugin', $pluginname, 'field', 'field, value');
773
    if (!empty($records)) {
774
775
        foreach($records as $record) {
            $CFG->plugin->{$plugintype}->{$pluginname}->{$record->field} = $record->value;
776
            if ($record->field == $key) {
777
778
779
                $value = $record->value;
            }
        }
780
781
    }

782
783
784
    return $value;
}

Penny Leach's avatar
Penny Leach committed
785
function set_config_plugin($plugintype, $pluginname, $key, $value) {
786
    global $CFG;
787
    $table = $plugintype . '_config';
Penny Leach's avatar
Penny Leach committed
788

789
790
791
    if (false !== get_field($table, 'value', 'plugin', $pluginname, 'field', $key)) {
        //if (set_field($table, 'value', $key, 'plugin', $pluginname, 'field', $value)) {
        if (set_field($table, 'value', $value, 'plugin', $pluginname, 'field', $key)) {
Penny Leach's avatar
Penny Leach committed
792
793
794
795
796
797
798
799
            $status = true;
        }
    }
    else {
        $pconfig = new StdClass;
        $pconfig->plugin = $pluginname;
        $pconfig->field  = $key;
        $pconfig->value  = $value;
800
        $status = insert_record($table, $pconfig);
Penny Leach's avatar
Penny Leach committed
801
802
803
804
805
806
807
808
    }
    if ($status) {
        $CFG->plugin->{$plugintype}->{$pluginname}->{$key} = $value;
        return true;
    }
    return false;
}

809
810
811
812
813
814
815
816
817
818
/**
 * This function returns a value for $CFG for a plugin instance
 * or null if it is not found. Initially this is interesting only 
 * for multiauth. Note that it may go and look in the database
 *
 * @param string $plugintype   E.g. auth
 * @param string $pluginname   E.g. internal
 * @param string $pluginid     Instance id
 * @param string $key          The config setting to look for
 */
819
function get_config_plugin_instance($plugintype, $pluginid, $key) {
820
821
822
823
824
825
    global $CFG;

    // Must be unlikely to exist as a config option for any plugin
    $instance = '_i_n_s_t'.$pluginid;

    // Suppress NOTICE with @ in case $key is not yet cached
826
    @$value = $CFG->plugin->{$plugintype}->{$instance}->{$key};
827
    if (isset($value)) {
828
829
830
        return $value;
    }

831
    $records = get_records_array($plugintype . '_instance_config', 'instance', $pluginid, 'field', 'field, value');
832
    if (!empty($records)) {
833
        foreach($records as $record) {
834
            $CFG->plugin->{$plugintype}->{$instance}->{$record->field} = $record->value;
835
            if ($record->field == $key) {
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
                $value = $record->value;
            }
        }
    }

    return $value;
}

/**
 * This function returns a value for $CFG for a plugin instance
 * or null if it is not found. Initially this is interesting only 
 * for multiauth. Note that it may go and look in the database
 *
 * @param string $plugintype   E.g. auth
 * @param string $pluginname   E.g. internal
 * @param string $pluginid     Instance id
 * @param string $key          The config setting to look for
 */
function set_config_plugin_instance($plugintype, $pluginname, $pluginid, $key, $value) {
    global $CFG;
    $table = $plugintype . '_instance_config';

    if (false !== get_field($table, 'value', 'instance', $pluginid, 'field', $key)) {
        if (set_field($table, 'value', $value, 'instance', $pluginid, 'field', $key)) {
            $status = true;
        }
    }
    else {
        $pconfig = new StdClass;
        $pconfig->instance = $pluginid;
        $pconfig->field  = $key;
        $pconfig->value  = $value;
        $status = insert_record($table, $pconfig);
    }
    if ($status) {
        // Must be unlikely to exist as a config option for any plugin
        $instance = '_i_n_s_t'.$pluginid;
        $CFG->plugin->{$plugintype}->{$pluginname}->{$instance}->{$key} = $value;
        return true;
    }
    return false;
}

879
/**
880
881
882
883
884
 * This function prints an array or object
 * wrapped inside <pre></pre>
 * 
 * @param $mixed value to print
 */
885
886
887
888
889
890
function print_object($mixed) {
    echo '<pre>';
    print_r($mixed);
    echo '</pre>';
}

891
/**
892
893
894
895
896
897
 * This function returns the current 
 * language to use, either for a given user
 * or sitewide, or the default
 * 
 * @return string
 */
898
function current_language() {
899
    global $USER, $CFG, $SESSION;
900
901
902
    if ($USER instanceof User) {
        $lang = $USER->get_account_preference('lang');
        if ($lang !== null && $lang != 'default') {
903
904
905
906
            if (language_installed($lang)) {
                return $lang;
            }
            $USER->set_account_preference('lang', 'default');
907
        }
908
    }
909
910
911
912
913
914

    if (is_a($SESSION, 'Session')) {
        $sesslang = $SESSION->get('lang');
        if (!empty($sesslang) && $sesslang != 'default') {
            return $sesslang;
        }
915
    }
916

917
918
919
920
921
922
    if (!empty($CFG->lang)) {
        return $CFG->lang;
    }
    return 'en.utf8';
}

923
/**
924
925
926
927
928
929
 * Helper function to sprintf language strings
 * with a variable number of arguments
 * 
 * @param string $string raw string to use
 * @param array $args arguments to sprintf
 */
930
931
932
933
function format_langstring($string,$args) {
    return call_user_func_array('sprintf',array_merge(array($string),$args));
}

934
935
936
937
938
939
940
941
942
943
944
945
946
/**
 * Helper function to figure out whether an array is an array or a hash
 * @param array $array array to check
 * @return bool true if the array is a hash
 */
function is_hash($array) {
    if (!is_array($array)) {
        return false;
    }
    $diff = array_diff_assoc($array,array_values($array));
    return !empty($diff);
}

947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
/**
 * Function to check if a directory exists and optionally create it.
 *
 * @param string absolute directory path
 * @param boolean create directory if does not exist
 * @param boolean create directory recursively
 *
 * @return boolean true if directory exists or created
 */
function check_dir_exists($dir, $create=true, $recursive=true) {

    $status = true;

    if(!is_dir($dir)) {
        if (!$create) {
            $status = false;
        } else {
964
965
966
            $mask = umask(0000);
            $status = @mkdir($dir, get_config('directorypermissions'), true);
            umask($mask);
967
968
969
970
971
        }
    }
    return $status;
}

972

Penny Leach's avatar
Penny Leach committed
973
974
975
/**
 * Function to require a plugin file. This is to avoid doing 
 * require and include directly with variables.
976
 *
Penny Leach's avatar
Penny Leach committed
977
978
 * This function is the one safe point to require plugin files.
 * so USE it :)
979
 *
980
981
982
983
984
985
986
987
 * blocktypes are special cases.  eg:
 *   system blocks: safe_require('blocktype', 'wall');
 *   artefact blocks: safe_require('blocktype', 'file/html');
 *
 * import/export plugins are special cases.  eg:
 *   main library: safe_require('export', 'leap');
 *   artefact plugin implementation: safe_require('export', 'leap/file');
 *
Penny Leach's avatar
Penny Leach committed
988
989
990
991
992
993
 * @param string $plugintype the type of plugin (eg artefact)
 * @param string $pluginname the name of the plugin (eg blog)
 * @param string $filename the name of the file to include within the plugin structure
 * @param string $function (optional, defaults to require) the require/include function to use
 * @param string $nonfatal (optional, defaults to false) just returns false if the file doesn't exist
 */
994
function safe_require($plugintype, $pluginname, $filename='lib.php', $function='require_once', $nonfatal=false) {
995
996
997
998
    $plugintypes = plugin_types();
    if (!in_array($plugintype, $plugintypes)) {
        throw new Exception("\"$plugintype\" is not a valid plugin type");
    }
999
1000
    require_once(get_config('docroot') . $plugintype . '/lib.php');

For faster browsing, not all history is shown. View entire blame