mahara.php 64.9 KB
Newer Older
1
2
<?php
/**
Francois Marier's avatar
Francois Marier committed
3
 * Mahara: Electronic portfolio, weblog, resume builder and social networking
4
 * Copyright (C) 2006-2008 Catalyst IT Ltd (http://www.catalyst.net.nz)
5
 *
Francois Marier's avatar
Francois Marier committed
6
7
8
9
 * 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.
10
 *
Francois Marier's avatar
Francois Marier committed
11
12
13
14
 * 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.
15
 *
Francois Marier's avatar
Francois Marier committed
16
17
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18
19
20
 *
 * @package    mahara
 * @subpackage core
21
 * @author     Catalyst IT Ltd
22
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
23
 * @copyright  (C) 2006-2008 Catalyst IT Ltd http://catalyst.net.nz
24
 * @copyright  (C) portions from Moodle, (C) Martin Dougiamas http://dougiamas.com
25
26
 */

27
defined('INTERNAL') || die();
28

29
30
31
32
33
34
35
/** 
 * work around silly php settings
 * and broken setup stuff about the install
 * and raise a warning/fail depending on severity
 */
function ensure_sanity() {

36
    // PHP version
37
    if (version_compare(phpversion(), '5.1.3') < 0) {
38
39
40
41
42
43
44
        throw new ConfigSanityException(get_string('phpversion', 'error'));
    }

    // Various required extensions
    if (!extension_loaded('json')) {
        throw new ConfigSanityException(get_string('jsonextensionnotloaded', 'error'));
    }
45
46
47
48
49
50
    switch (get_config('dbtype')) {
    case 'postgres8':
        if (!extension_loaded('pgsql')) {
            throw new ConfigSanityException(get_string('pgsqldbextensionnotloaded', 'error'));
        }
        break;
51
    case 'mysql5':
52
53
54
55
56
57
        if (!extension_loaded('mysql')) {
            throw new ConfigSanityException(get_string('mysqldbextensionnotloaded', 'error'));
        }
        break;
    default:
        throw new ConfigSanityException(get_string('unknowndbtype', 'error'));
58
    }
59
60
61
    if (!extension_loaded('xml')) {
        throw new ConfigSanityException(get_string('xmlextensionnotloaded', 'error', 'xml'));
    }
62
    if (!extension_loaded('libxml')) {
63
        throw new ConfigSanityException(get_string('xmlextensionnotloaded', 'error', 'libxml'));
64
65
66
67
68
69
70
71
    }
    if (!extension_loaded('gd')) {
        throw new ConfigSanityException(get_string('gdextensionnotloaded', 'error'));
    }
    if (!extension_loaded('session')) {
        throw new ConfigSanityException(get_string('sessionextensionnotloaded', 'error'));
    }

72
73
74
75
    if(!extension_loaded('curl')) {
        throw new ConfigSanityException(get_string('curllibrarynotinstalled', 'error'));
    }

76
77
78
79
80
81
    //Check for freetype in the gd extension
    $gd_info = gd_info();
    if (!$gd_info['FreeType Support']) {
        throw new ConfigSanityException(get_string('gdfreetypenotloaded', 'error'));
    }

82
83
    // register globals workaround
    if (ini_get_bool('register_globals')) {
84
        log_environ(get_string('registerglobals', 'error'));
85
        $massivearray = array_keys(array_merge($_POST, $_GET, $_COOKIE, $_SERVER, $_REQUEST, $_FILES));
86
87
88
89
90
91
        foreach ($massivearray as $tounset) {
            unset($GLOBALS[$tounset]);
        }
    }

    // magic_quotes_gpc workaround
92
    if (!defined('CRON') && ini_get_bool('magic_quotes_gpc')) {
93
        log_environ(get_string('magicquotesgpc', 'error'));
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
        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]);
            }
        }
    }

113
    if (ini_get_bool('magic_quotes_runtime')) {
114
115
116
117
118
119
120
121
122
        // 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'));
123
124
    }

125
126
127
    if (ini_get_bool('safe_mode')) {
        // We don't run with safe mode
        throw new ConfigSanityException(get_string('safemodeon', 'error'));
128
129
    }

130
131
132
133
134
135
136
    // Other things that might be worth checking:
    //    memory limit
    //    file_uploads (off|on)
    //    upload_max_filesize
    //    allow_url_fopen (only if we use this)
    //

137
    // dataroot inside document root.
138
139
    if (strpos(get_config('dataroot'), get_config('docroot')) !== false) {
        throw new ConfigSanityException(get_string('datarootinsidedocroot', 'error'));
140
141
    }

142
143
    // dataroot not writable..
    if (!check_dir_exists(get_config('dataroot')) || !is_writable(get_config('dataroot'))) {
144
        throw new ConfigSanityException(get_string('datarootnotwritable', 'error', get_config('dataroot')));
145
    }
146

147
148
149
    if (
        !check_dir_exists(get_config('dataroot') . 'smarty/compile') ||
        !check_dir_exists(get_config('dataroot') . 'smarty/cache') ||
150
        !check_dir_exists(get_config('dataroot') . 'sessions') ||
151
        !check_dir_exists(get_config('dataroot') . 'langpacks') ||
152
        !check_dir_exists(get_config('dataroot') . 'htmlpurifier')) {
153
154
        throw new ConfigSanityException(get_string('couldnotmakedatadirectories', 'error'));
    }
155
156

    raise_memory_limit('32M');
157
158
}

159
160
161
162
163
/**
 * Check to see if the internal plugins are installed. Die if they are not.
 */
function ensure_internal_plugins_exist() {
    // Internal things installed
164
    if (get_config('installed')) {
165
166
167
168
169
170
171
172
        foreach (plugin_types() as $type) {
            if (!record_exists($type . '_installed', 'name', 'internal')) {
                throw new ConfigSanityException(get_string($type . 'notinstalled'));
            }
        }
    }
}

173
function get_string($identifier, $section='mahara') {
174
175
176
177
178

    $variables = func_get_args();
    if (count($variables) > 2) { // we have some stuff we need to sprintf
        array_shift($variables);
        array_shift($variables); //shift off the first two.
179
180
    }
    else {
181
182
183
        $variables = array();
    }
    
184
185
186
    return get_string_location($identifier, $section, $variables);
}

187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
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);
}

202
203
204
205
206
207
208
209
210
211
212
213
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') {
214
        $location = $plugintype . '/' . $pluginname . '/lang/';
215
216
    }
    else {
217
        $location = 'lang/';
218
219
220
    }
    if ($page) {
        $page = str_replace('-', '/', $page);
221
222
223
224
225
226
        if ($plugintype != 'core') {
            $file .=  'pages/' . $page . '.html';
        }
        else {
            $file .= 'pages/' . $pluginname . '/' . $page . '.html';
        } 
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
    }
    else if ($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;
    }

    // try the current language
251
    $langfile = get_language_root() . $location . $lang . '/' . $file;
252
253
254
255
256
257
    if (is_readable($langfile)) {
        return $langfile;
    }

    // if it's not found, try the parent language if there is one...
    if (empty($data) && empty($trieden)) {
258
        $langfile = get_language_root($lang) . 'lang/' . $lang . '/langconfig.php';
259
260
261
262
        if ($parentlang = get_string_from_file('parentlanguage', $langfile)) {
            if ($parentlang == 'en.utf8') {
                $trieden = true;
            }
263
            $langfile = get_language_root($parentlang) . $location . $parentlang . '/' . $file;
264
265
266
267
268
269
270
271
            if (is_readable($langfile)) {
                return $langfile;
            }
        }
    }

    // if it's STILL not found, and we haven't already tried english ...
    if (empty($data) && empty($trieden)) {
272
        $langfile = get_language_root('en.utf8') . $location . 'en.utf8/' . $file;
273
274
275
276
277
278
279
        if (is_readable($langfile)) {
            return $langfile;
        }
    }
    return false;
}

280
281
282
283
284
// get a string without sprintfing it.
function get_raw_string($identifier, $section='mahara') {
    // For a raw string we don't want to format any arguments using
    // sprintf, so the replace function passed to get_string_location
    // should just return the first argument and ignore the second.
285
286
    return get_string_location($identifier, $section, array(), 
                               create_function('$string, $args','return $string;'));
287
288
289
290
291
292
293
294
295
296
297
298
299
300
}


/**
 * 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 $replacefunc
 * @return string
 */
301
function get_string_location($identifier, $section, $variables, $replacefunc='format_langstring', $lang='') {
302

303
    $langconfigstrs = array('parentlanguage', 'strftimedate', 'strftimedateshort', 'strftimedatetime', 'strftimedatetimeshort',
304
305
                            'strftimedaydate', 'strftimedaydatetime', 'strftimedayshort', 'strftimedaytime',
                            'strftimemonthyear', 'strftimerecent', 'strftimerecentfull', 'strftimetime',
Richard Mansfield's avatar
Richard Mansfield committed
306
                            'strfdaymonthyearshort', 'thislanguage');
307
308
309
310
311

    if (in_array($identifier, $langconfigstrs)) {
        $section = 'langconfig';
    }

312
313
314
    if (empty($lang)) {
        $lang = current_language();
    }
315
316

    // Define the locations of language strings for this section
317
    $langstringroot = get_language_root($lang);
318
    $langdirectory  = ''; // The directory in which the language file for this string should ideally reside, if the language has implemented it
319
    
320
    if (false === strpos($section, '.')) {
321
        $langdirectory = 'lang/';
322
323
324
    }
    else {
        $extras = plugin_types(); // more later..
325
        foreach ($extras as $tocheck) {
326
            if (strpos($section, $tocheck . '.') === 0) {
Nigel McNie's avatar
Nigel McNie committed
327
                $pluginname = substr($section ,strlen($tocheck) + 1);
328
329
330
                if ($tocheck == 'blocktype' && 
                    strpos($pluginname, '/') !== false) { // it belongs to an artefact plugin
                    $bits = explode('/', $pluginname);
331
                    $langdirectory = 'artefact/' . $bits[0] . '/blocktype/' . $bits[1] . '/lang/';
332
                    $section = 'blocktype.' . $bits[1];
333
334
                }
                else {
335
                    $langdirectory = $tocheck . '/' . $pluginname . '/lang/';
336
                }
337
338
339
            }
        }
    }
340

341
    // First check all the normal locations for the string in the current language
342
343
344
345
    $langfile = $langstringroot . $langdirectory . $lang . '/' . $section . '.php';
    if (is_readable($langfile)) {
        if ($result = get_string_from_file($identifier, $langfile)) {
            return $replacefunc($result, $variables);
346
347
348
349
350
351
        }
    }

    // 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') {
352
        return '[[' . $identifier . '/' . $section . ']]';
353
354
355
    }

    // Is a parent language defined?  If so, try to find this string in a parent language file
356
357
358
359
360
361
362
    $langfile = $langstringroot . 'lang/' . $lang . '/langconfig.php';
    if (is_readable($langfile)) {
        if ($parentlang = get_string_from_file('parentlanguage', $langfile)) {
            $langfile = get_language_root($parentlang) . 'lang/' . $parentlang . '/' . $section . '.php';
            if (is_readable($langfile)) {
                if ($result = get_string_from_file($identifier, $langfile)) {
                    return $replacefunc($result, $variables);
363
364
365
366
367
368
                }
            }
        }
    }

    /// Our only remaining option is to try English
369
370
371
372
    $langfile = get_config('docroot') . $langdirectory . 'en.utf8/' . $section . '.php';
    if (is_readable($langfile)) {
        if ($result = get_string_from_file($identifier, $langfile)) {
            return $replacefunc($result, $variables);
373
374
375
        }
    }

376
    return '[[' . $identifier . '/' . $section . ']]';  // Last resort
377
}
378
379


380
381
382
383
384
/**
 * Return a list of available languages
 *
 */
function get_languages() {
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
    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] = $langname;
                            }
                        }
                    }
400
                }
401
402
403
404
                closedir($langdir);
            }
            else {
                log_warn('Unable to read language directory ' . $langbase);
405
406
407
            }
        }
    }
408

409
410
411
    return $langs;
}

412
413
414
/**
 * Returns whether the given language is installed/available for use
 */
415
function language_installed($lang) {
416
417
418
419
420
421
    foreach (language_get_searchpaths() as $searchpath) {
        if (is_readable($searchpath . 'lang/' . $lang . '/langconfig.php')) {
            return true;
        }
    }
    return false;
422
423
}

424
425
426
427
428
429
430
431
432
/**
 * 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) {
433
434
435
436
        // Construct the search path
        $docrootpath = array(get_config('docroot'));

        // Paths to language files in dataroot
437
        $datarootpaths = (array)glob(get_config('dataroot') . 'langpacks/*.utf8', GLOB_MARK | GLOB_ONLYDIR);
438
439
440
441
442
443
444
445
446
447

        // 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");
448
            }
449
        }
450
451

        $searchpaths = array_merge($docrootpath, $datarootpaths, $langpacksearchpaths);
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
    }

    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];
}

489
/**
490
 * Return a list of available themes.
491
 *
492
 * Themes _must_ have a config.php, and it should specify a theme name.
493
494
495
496
497
 */
function get_themes() {
    $themes = array();
    $themebase = get_config('docroot') . 'theme/';
    if (!$themedir = opendir($themebase)) {
498
        throw new SystemException('Unable to read theme directory '.$themebase);
499
500
    }
    while (false !== ($subdir = readdir($themedir))) {
501
502
        if ($subdir != "." && $subdir != ".." && is_dir($themebase . $subdir)) {
            $config_path = $themebase . $subdir . '/config.php';
503
            if (is_readable($config_path)) {
504
                require($config_path);
505
506
507
508
                if (isset($theme->name)) {
                    $themes[$subdir] = $theme->name;
                }
            }
509
510
511
512
513
514
515
        }
    }
    closedir($themedir);
    return $themes;
}


516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
/**
 * 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
 *
554
 * @param string $ini_get_arg setting to look for
555
556
557
558
559
560
561
562
563
564
565
 * @return bool
 */
function ini_get_bool($ini_get_arg) {
    $temp = ini_get($ini_get_arg);

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

566
567
568
569
570
571
572
573
574
575
/**
 * 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;
    
576
    $dbconfig = get_records_array('config', '', '', '', 'field, value');
577
578
    
    foreach ($dbconfig as $cfg) {
579
        if (isset($CFG->{$cfg->field}) && $CFG->{$cfg->field} != $cfg->value) {
Penny Leach's avatar
Penny Leach committed
580
            // @todo warn that we're overriding db config with $CFG
581
582
583
584
585
586
587
588
589
            continue;
        }
        $CFG->{$cfg->field} = $cfg->value;
    }

    return true;
}

/**
590
591
592
593
594
595
 * This function returns a value from $CFG
 * or null if it is not found
 * 
 * @param string $key config setting to look for 
 * @return mixed
 */
596
597
function get_config($key) {
    global $CFG;
598
    if (isset($CFG->$key)) {
599
600
601
602
603
        return $CFG->$key;
    }
    return null;
}

604
605
606
607
608
609
610
611
612

/**
 * 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) {
613
614
    global $CFG;

615
    db_ignore_sql_exceptions(true);
616
617
    if (get_record('config', 'field', $key)) {
        if (set_field('config', 'value', $value, 'field', $key)) {
Penny Leach's avatar
Penny Leach committed
618
619
620
621
622
623
624
            $status = true;
        }
    } 
    else {
        $config = new StdClass;
        $config->field = $key;
        $config->value = $value;
625
        $status = insert_record('config', $config);
Penny Leach's avatar
Penny Leach committed
626
    }
627
    db_ignore_sql_exceptions(false);
Penny Leach's avatar
Penny Leach committed
628
629

    if (!empty($status)) {
630
631
632
        $CFG->{$key} = $value;
        return true;
    }
Penny Leach's avatar
Penny Leach committed
633

634
635
636
637
638
639
640
641
642
643
644
645
646
647
    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;
648

649
650
    // Suppress NOTICE with @ in case $key is not yet cached
    @$value = $CFG->plugin->{$plugintype}->{$pluginname}->{$key};
651
    if (isset($value)) {
652
653
654
655
        return $value;
    }

    $records = get_records_array($plugintype . '_config', 'plugin', $pluginname, 'field', 'field, value');
656
    if (!empty($records)) {
657
658
        foreach($records as $record) {
            $CFG->plugin->{$plugintype}->{$pluginname}->{$record->field} = $record->value;
659
            if ($record->field == $key) {
660
661
662
                $value = $record->value;
            }
        }
663
664
    }

665
666
667
    return $value;
}

Penny Leach's avatar
Penny Leach committed
668
function set_config_plugin($plugintype, $pluginname, $key, $value) {
669
    global $CFG;
670
    $table = $plugintype . '_config';
Penny Leach's avatar
Penny Leach committed
671

672
673
674
    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
675
676
677
678
679
680
681
682
            $status = true;
        }
    }
    else {
        $pconfig = new StdClass;
        $pconfig->plugin = $pluginname;
        $pconfig->field  = $key;
        $pconfig->value  = $value;
683
        $status = insert_record($table, $pconfig);
Penny Leach's avatar
Penny Leach committed
684
685
686
687
688
689
690
691
    }
    if ($status) {
        $CFG->plugin->{$plugintype}->{$pluginname}->{$key} = $value;
        return true;
    }
    return false;
}

692
693
694
695
696
697
698
699
700
701
/**
 * 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 $key          The config setting to look for
 */
702
function get_config_plugin_instance($plugintype, $pluginid, $key) {
703
704
705
706
707
708
    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 $key is not yet cached
709
    @$value = $CFG->plugin->{$plugintype}->{$instance}->{$key};
710
    if (isset($value)) {
711
712
713
        return $value;
    }

714
    $records = get_records_array($plugintype . '_instance_config', 'instance', $pluginid, 'field', 'field, value');
715
    if (!empty($records)) {
716
        foreach($records as $record) {
717
            $CFG->plugin->{$plugintype}->{$instance}->{$record->field} = $record->value;
718
            if ($record->field == $key) {
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
                $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;
}

762
/**
763
764
765
766
767
 * This function prints an array or object
 * wrapped inside <pre></pre>
 * 
 * @param $mixed value to print
 */
768
769
770
771
772
773
function print_object($mixed) {
    echo '<pre>';
    print_r($mixed);
    echo '</pre>';
}

774
/**
775
776
777
778
779
780
 * This function returns the current 
 * language to use, either for a given user
 * or sitewide, or the default
 * 
 * @return string
 */
781
function current_language() {
782
    global $USER, $CFG, $SESSION;
783
784
785
    if ($USER instanceof User) {
        $lang = $USER->get_account_preference('lang');
        if ($lang !== null && $lang != 'default') {
786
787
788
789
            if (language_installed($lang)) {
                return $lang;
            }
            $USER->set_account_preference('lang', 'default');
790
        }
791
    }
792
793
794
795
796
797

    if (is_a($SESSION, 'Session')) {
        $sesslang = $SESSION->get('lang');
        if (!empty($sesslang) && $sesslang != 'default') {
            return $sesslang;
        }
798
    }
799

800
801
802
803
804
805
    if (!empty($CFG->lang)) {
        return $CFG->lang;
    }
    return 'en.utf8';
}

806
/**
807
808
809
810
811
812
 * Helper function to sprintf language strings
 * with a variable number of arguments
 * 
 * @param string $string raw string to use
 * @param array $args arguments to sprintf
 */
813
814
815
816
function format_langstring($string,$args) {
    return call_user_func_array('sprintf',array_merge(array($string),$args));
}

817
818
819
820
821
822
823
824
825
826
827
828
829
/**
 * 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);
}

830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
/**
 * 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 {
847
848
849
            $mask = umask(0000);
            $status = @mkdir($dir, get_config('directorypermissions'), true);
            umask($mask);
850
851
852
853
854
        }
    }
    return $status;
}

Penny Leach's avatar
Penny Leach committed
855
856
857
/**
 * Function to require a plugin file. This is to avoid doing 
 * require and include directly with variables.
858
 *
Penny Leach's avatar
Penny Leach committed
859
860
 * This function is the one safe point to require plugin files.
 * so USE it :)
861
 *
Penny Leach's avatar
Penny Leach committed
862
863
864
865
866
867
 * @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 $nonfatal (optional, defaults to false) just returns false if the file doesn't exist
 */
868
function safe_require($plugintype, $pluginname, $filename='lib.php', $function='require_once', $nonfatal=false) {
869
870
871
872
    $plugintypes = plugin_types();
    if (!in_array($plugintype, $plugintypes)) {
        throw new Exception("\"$plugintype\" is not a valid plugin type");
    }
873
874
    require_once(get_config('docroot') . $plugintype . '/lib.php');

875
    if (!in_array($function,array('require', 'include', 'require_once', 'include_once'))) {
Penny Leach's avatar
Penny Leach committed
876
877
878
879
880
881
        if (!empty($nonfatal)) {
            return false;
        }
        throw new Exception ('invalid require type');
    }

882
883
884
885
886
    if ($plugintype == 'blocktype') { // these are a bit of a special case
        $bits = explode('/', $pluginname);
        if (count($bits) == 2) {
           $fullpath = get_config('docroot') . 'artefact/' . $bits[0] . '/blocktype/' . $bits[1] . '/' . $filename;
        }
887
        else {
888
889
890
891
892
893
894
895
896
            try {
                if ($artefactplugin = get_field('blocktype_installed', 'artefactplugin', 'name', $pluginname)) {
                    $fullpath = get_config('docroot') . 'artefact/' . $artefactplugin . '/blocktype/' . $pluginname . '/'. $filename;
                }
            }
            catch (SQLException $e) {
                if (get_config('installed')) {
                    throw $e;
                }
897
898
            }
        }
899
900
901
902
903
    } 
    if (empty($fullpath)) {
        $fullpath = get_config('docroot') . $plugintype . '/' . $pluginname . '/' . $filename;
    }

Penny Leach's avatar
Penny Leach committed
904
905
906
907
    if (!$realpath = realpath($fullpath)) {
        if (!empty($nonfatal)) {
            return false;
        }
908
        throw new SystemException ("File $fullpath did not exist");
Penny Leach's avatar
Penny Leach committed
909
910
911
912
913
914
    }

    if (strpos($realpath, get_config('docroot') !== 0)) {
        if (!empty($nonfatal)) {
            return false;
        }
915
        throw new SystemException ("File $fullpath was outside document root!");
Penny Leach's avatar
Penny Leach committed
916
917
918
919
920
921
922
923
924
    }

    if ($function == 'require') { return require($realpath); }
    if ($function == 'include') { return include($realpath); }
    if ($function == 'require_once') { return require_once($realpath); }
    if ($function == 'include_once') { return include_once($realpath); }
    
}

925
/**
926
927
928
929
 * This function returns the list of plugintypes we currently care about.
 *
 * NOTE: use plugin_types_installed if you just want the installed ones.
 *
930
931
932
933
934
 * @return array of names
 */
function plugin_types() {
    static $pluginstocheck;
    if (empty($pluginstocheck)) {
935
        // ORDER MATTERS! artefact has to be first!
936
        $pluginstocheck = array('artefact', 'auth', 'notification', 'search', 'blocktype', 'interaction', 'grouptype');
937
938
939
940
    }
    return $pluginstocheck;
}

941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
/**
 * Returns plugin types that are actually installed
 */
function plugin_types_installed() {
    static $plugins = array();
    if (empty($plugins)) {
        require_once('ddl.php');
        foreach (plugin_types() as $plugin) {
            if (table_exists(new XMLDBTable("{$plugin}_installed"))) {
                $plugins[] = $plugin;
            }
        }
    }
    return $plugins;
}

957
958
959
960
961
962
/** 
 * This return returns the names of plugins installed 
 * for the given plugin type.
 * 
 * @param string $plugintype type of plugin
 */
963
function plugins_installed($plugintype, $all=false) {
964
965
966
967
    $sort = 'name';
    if ($plugintype == 'blocktype') {
        $sort = 'artefactplugin,name';
    }
968
    if ($all) {
969
        return get_records_array($plugintype . '_installed', '', '', $sort);
970
    }
971
    return get_records_array($plugintype . '_installed', 'active', 1, $sort);
972
973
}

974
975
976
977
978
979
980
981
/**
 * Helper to call a static method when you do not know the name of the class
 * you want to call the method on. PHP5 does not support $class::method().
 */
function call_static_method($class, $method) {
    $args = func_get_args();
    array_shift($args);
    array_shift($args);
982
    return call_user_func_array(array($class, $method), $args);
983
984
}

985
986
function generate_class_name() {
    $args = func_get_args();
987
    if (count($args) == 2 && $args[0] == 'blocktype') {
988
        return 'PluginBlocktype' . ucfirst(blocktype_namespaced_to_single($args[1]));
989
    }
990
991
992
    return 'Plugin' . implode('', array_map('ucfirst', $args));
}

993
994
995
996
function generate_artefact_class_name($type) {
    return 'ArtefactType' . ucfirst($type);
}

997
998
999
1000
function generate_interaction_instance_class_name($type) {
    return 'Interaction' . ucfirst($type) . 'Instance';
}

1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
function blocktype_namespaced_to_single($blocktype) {
    if (strpos($blocktype, '/') === false) { // system blocktype
        return $blocktype;
    }
    return substr($blocktype, strpos($blocktype, '/') + 1 );
}

function blocktype_single_to_namespaced($blocktype, $artefact='') {
    if (empty($artefact)) {
        return $blocktype;
    }
    return $artefact . '/' . $blocktype;
1013
1014
}

1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
/**
 * Given a blocktype name, convert it to the namespaced version.
 *
 * This will be $artefacttype/$blocktype, or just plain $blocktype for system 
 * blocktypes.
 *
 * This is useful for language strings
 */
function blocktype_name_to_namespaced($blocktype) {
    static $resultcache = array();

    if (!isset($resultcache[$blocktype])) {
        $artefactplugin = get_field('blocktype_installed', 'artefactplugin', 'name', $blocktype);
        if ($artefactplugin) {
            $resultcache[$blocktype] = "$artefactplugin/$blocktype";
        }
        else {
            $resultcache[$blocktype] = $blocktype;
        }
    }

    return $resultcache[$blocktype];
}

1039

1040
1041
1042
1043
1044
/**
 * Fires an event which can be handled by different parts of the system
 */
function handle_event($event, $data) {
    if (!$e = get_record('event_type', 'name', $event)) {
Martyn Smith's avatar
Martyn Smith committed
1045
        throw new Exception("Invalid event");
Penny Leach's avatar
Penny Leach committed
1046
    }
1047

1048
    if ($data instanceof ArtefactType || $data instanceof BlockInstance) {
1049
1050
1051
        // leave it alone
    }
    else if (is_object($data)) {
1052
1053
        $data = (array)$data;
    }
1054
    else if (is_numeric($data)) {
1055
1056
1057
        $data = array('id' => $data);
    }

1058
    if ($coreevents = get_records_array('event_subscription', 'event', $event)) {
1059
        require_once('activity.php'); // core events can generate activity.
1060
1061
1062
1063
1064
1065
1066
1067
1068
        foreach ($coreevents as $ce) {
            if (function_exists($ce->callfunction)) {
                call_user_func($ce->callfunction, $data);
            }
            else {
                log_warn("Event $event caused a problem with a core subscription "
                . " $ce->callfunction, which wasn't callable.  Continuing with event handlers");
            }
        }
1069
1070
    }

1071
    $plugintypes = plugin_types_installed();
Penny Leach's avatar
Penny Leach committed
1072
    foreach ($plugintypes as $name) {
1073
        if ($subs = get_records_array($name . '_event_subscription', 'event', $event)) {
Penny Leach's avatar
Penny Leach committed
1074
            foreach ($subs as $sub) {
1075
                safe_require($name, $sub->plugin);
Penny Leach's avatar
Penny Leach committed
1076
1077
                $classname = 'Plugin' . ucfirst($name) . ucfirst($sub->plugin);
                try {
1078
                    call_static_method($classname, $sub->callfunction, $event, $data);
Penny Leach's avatar
Penny Leach committed
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
                }
                catch (Exception $e) {
                    log_warn("Event $event caused an exception from plugin $classname "
                             . "with function $sub->callfunction. Continuing with event handlers");
                }
            }
        }
    }
}

1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
/**
 * function to convert an array of objects to 
 * an array containing one field per place
 * 
 * @param array $array input array
 * @param mixed $field field to look for in each object
 */
function mixed_array_to_field_array($array, $field) {
    $repl_fun = create_function('$n, $field', '$n = (object)$n; return $n->{$field};');
    $fields = array_pad(array(), count($array), $field);
    return array_map($repl_fun, $array, $fields);
}


Penny Leach's avatar
Penny Leach committed
1103
1104
/** 
 * Adds stuff to the log
1105
 * @todo write this function
Penny Leach's avatar
Penny Leach committed
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
 *
 * @param string $plugintype plugin type or core
 * @param string $pluginname plugin name or core component (eg 'view')
 * @param string $action action string (like 'add')
 * @param int $user id of user making the action
 * @param int $id relevant id (ie, profile view would have id of profile owner)
 * 
 */
function add_to_log($plugintype, $pluginname, $action, $user, $id=0) {

}

1118
1119
1120
1121
/**
 * Used by XMLDB
 */
function debugging ($message, $level) {
1122
    log_debug($message);
1123
1124
1125
1126
1127
1128
}
function xmldb_dbg($message) {
    log_warn($message);
}
define('DEBUG_DEVELOPER', 'whocares');

1129
1130
1131
/** 
 * Base class for all plugintypes.
 */
1132
class Plugin {
1133
    
1134
1135
    /**
     * This function returns an array of crons it wants to have run
1136
     * Each item should be a StdClass object containing - 
1137
1138
1139
1140
     * - callfunction (static function on the Plugin Class)
     * - any or all of minute, hour, day, month, dayofweek 
     * (will default to * if not supplied)
     */
1141
1142
1143
1144
    public static function get_cron() {
        return array();
    }

1145
1146
1147
1148
1149
1150
1151
    /** 
     * This function returns an array of events to subscribe to
     * by unique name. 
     * If an event the plugin is trying to subscribe to is unknown by the
     * core, an exception will be thrown.
     * @return array
     */
1152
1153
1154
1155
    public static function get_event_subscriptions() {
        return array();
    }

1156
1157
1158
1159
1160
1161
1162

    /**
     * This function will be run after every upgrade to the plugin.
     * 
     * @param int $fromversion version upgrading from (or 0 if installing)
     */
    public static function postinst($fromversion) {
1163
1164
        return true;
    }
1165

1166
1167
1168
1169
1170
    /**
     * Whether this plugin has admin plugin config options.
     * If you return true here, you must supply a valid pieform
     * in {@link get_config}
     */
1171
1172
1173
    public static function has_config() {
        return false;
    }
1174
1175
1176
1177
1178
1179
1180
1181
1182

    /**
    * Does this plugin offer any activity types
    * If it does, you must subclass ActivityTypePlugin like 
    * ActivityType{$PluginType}{$Pluginname}
    */
    public static function get_activity_types() {
        return array();
    }
1183
1184
1185
1186
1187
1188
1189
1190
1191

    /**
    * Can this plugin be disabled?
    * All internal type plugins, and ones in which Mahara won't work should override this.
    * Probably at least one plugin per plugin-type should override this.
    */
    public static function can_be_disabled() {
        return true;
    }
1192
1193
}

1194
1195
1196
1197
1198
/**
 * formats a unix timestamp to a nice date format.
 * 
 * @param int $date unix timestamp to format
 * @param string $formatkey language key to fetch the format from
1199
1200
 * @param string $notspecifiedkey (optional) language key to fetch 'not specified string' from
 * @param string $notspecifiedsection (optional) language section to fetch 'not specified string' from
1201
1202
1203
1204
 * (see langconfig.php or the top of {@link get_string_location}
 * for supported keys
 */

1205
function format_date($date, $formatkey='strftimedatetime', $notspecifiedkey='strftimenotspecified', $notspecifiedsection='mahara') {
1206
    if (empty($date)) {
1207
        return get_string($notspecifiedkey, $notspecifiedsection);
1208
    }
1209
1210
1211
    return strftime(get_string($formatkey), $date);
}

1212
1213
1214
/**
 * Returns a random string suitable for registration/change password requests
 *
1215
 * @param int $length The length of the key to return
1216
1217
 * @return string
 */
1218
1219
1220
1221
function get_random_key($length=16) {
    if ($length < 1) {
        throw new IllegalArgumentException('Length must be a positive number');
    }
1222
1223
1224
1225
1226
1227
1228
    $pool = array_merge(
        range('A', 'Z'),
        range('a', 'z'),
        range(0, 9)
    );
    shuffle($pool);
    $result = '';
1229
    for ($i = 0; $i < $length; $i++) {
1230
1231
1232
1233
1234
        $result .= $pool[$i];
    }
    return $result;
}

1235

1236
1237
1238
1239
//
// Pieform related functions
//

1240
1241
1242
/**
 * Configures a default form
 */
1243
function pieform_configure() {
1244
    global $USER;
1245
1246
    $theme = ($USER->get('theme')) ? $USER->get('theme') : 'default';
    require(get_config('docroot') . 'theme/' . $theme . '/config.php');
1247
    return array(
1248
1249
        'method'    => 'post',
        'action'    => '',
1250
        'language'  => current_language(),
1251
        'autofocus' => true,
1252
        'renderer'  => (isset($theme->formrenderer)) ? $theme->formrenderer : 'table',
1253
        'requiredmarker' => true,
Nigel McNie's avatar
Nigel McNie committed
1254
        'elementclasses' => true,
1255
        'descriptionintwocells' => true,
1256
        'jsdirectory'    => get_config('wwwroot') . 'lib/pieforms/static/core/',
1257
        'replycallback'  => 'pieform_reply',
1258
1259
1260
1261
1262
1263
        'jserrorcallback'       => 'formError',
        'globaljserrorcallback' => 'formGlobalError',
        'jssuccesscallback'     => 'formSuccess',
        'presubmitcallback'     => 'formStartProcessing',
        'postsubmitcallback'    => 'formStopProcessing',
        'jserrormessage' => get_string('errorprocessingform'),
1264
        'configdirs' => get_config('libroot') . 'form/',
1265
        'helpcallback' => 'pieform_get_help',
1266
        'elements'   => array(
1267
            'sesskey' => array(
1268
                'type'  => 'hidden',
1269
                'value' => $USER->get('sesskey')
1270
1271
1272
1273
1274
            )
        )
    );
}

1275
1276
1277
1278
1279
function pieform_validate(Pieform $form, $values) {
    global $USER;
    if (!isset($values['sesskey'])) {
        throw new UserException('No session key');
    }