mahara.php 53.6 KB
Newer Older
1 2
<?php
/**
Francois Marier's avatar
Francois Marier committed
3 4
 * Mahara: Electronic portfolio, weblog, resume builder and social networking
 * Copyright (C) 2006-2007 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 21 22 23 24
 *
 * @package    mahara
 * @subpackage core
 * @author     Penny Leach <penny@catalyst.net.nz>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
 * @copyright  (C) 2006,2007 Catalyst IT Ltd http://catalyst.net.nz
 * @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 51 52 53 54 55 56 57 58
    switch (get_config('dbtype')) {
    case 'postgres8':
        if (!extension_loaded('pgsql')) {
            throw new ConfigSanityException(get_string('pgsqldbextensionnotloaded', 'error'));
        }
        break;
    case 'mysql5':
    case 'mysql': // NOTE: mysql to be phased out. This should be log_environ() in 1.0 and removed in 1.1
        if (!extension_loaded('mysql')) {
            throw new ConfigSanityException(get_string('mysqldbextensionnotloaded', 'error'));
        }
        break;
    default:
        throw new ConfigSanityException(get_string('unknowndbtype', 'error'));
59 60 61 62 63 64 65 66 67 68 69
    }
    if (!extension_loaded('libxml')) {
        throw new ConfigSanityException(get_string('libxmlextensionnotloaded', 'error'));
    }
    if (!extension_loaded('gd')) {
        throw new ConfigSanityException(get_string('gdextensionnotloaded', 'error'));
    }
    if (!extension_loaded('session')) {
        throw new ConfigSanityException(get_string('sessionextensionnotloaded', 'error'));
    }

70 71 72 73 74 75 76 77 78 79 80
    // Various optional extensions
    if (!extension_loaded('openssl')) {
        log_environ(get_string('opensslextensionnotloaded', 'error'));
    }
    if (!extension_loaded('curl')) {
        log_environ(get_string('curlextensionnotloaded', 'error'));
    }
    if (!extension_loaded('xmlrpc')) {
        log_environ(get_string('xmlrpcextensionnotloaded', 'error'));
    }

81 82
    // register globals workaround
    if (ini_get_bool('register_globals')) {
83
        log_environ(get_string('registerglobals', 'error'));
84
        $massivearray = array_keys(array_merge($_POST, $_GET, $_COOKIE, $_SERVER, $_REQUEST, $_FILES));
85 86 87 88 89 90 91
        foreach ($massivearray as $tounset) {
            unset($GLOBALS[$tounset]);
        }
    }

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

112
    if (ini_get_bool('magic_quotes_runtime')) {
113 114 115 116 117 118 119 120 121
        // 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'));
122 123
    }

124 125 126
    if (ini_get_bool('safe_mode')) {
        // We don't run with safe mode
        throw new ConfigSanityException(get_string('safemodeon', 'error'));
127 128
    }

129 130 131 132 133 134 135
    // Other things that might be worth checking:
    //    memory limit
    //    file_uploads (off|on)
    //    upload_max_filesize
    //    allow_url_fopen (only if we use this)
    //

136
    // dataroot inside document root.
137 138
    if (strpos(get_config('dataroot'), get_config('docroot')) !== false) {
        throw new ConfigSanityException(get_string('datarootinsidedocroot', 'error'));
139 140
    }

141 142
    // dataroot not writable..
    if (!check_dir_exists(get_config('dataroot')) || !is_writable(get_config('dataroot'))) {
143
        throw new ConfigSanityException(get_string('datarootnotwritable', 'error', get_config('dataroot')));
144
    }
145

146 147 148
    if (
        !check_dir_exists(get_config('dataroot') . 'smarty/compile') ||
        !check_dir_exists(get_config('dataroot') . 'smarty/cache') ||
149
        !check_dir_exists(get_config('dataroot') . 'templates') ||
150 151
        !check_dir_exists(get_config('dataroot') . 'sessions') ||
        !check_dir_exists(get_config('dataroot') . 'htmlpurifier')) {
152 153
        throw new ConfigSanityException(get_string('couldnotmakedatadirectories', 'error'));
    }
154 155
}

156 157 158 159 160
/**
 * Check to see if the internal plugins are installed. Die if they are not.
 */
function ensure_internal_plugins_exist() {
    // Internal things installed
161
    if (get_config('installed')) {
162 163 164 165 166 167 168 169
        foreach (plugin_types() as $type) {
            if (!record_exists($type . '_installed', 'name', 'internal')) {
                throw new ConfigSanityException(get_string($type . 'notinstalled'));
            }
        }
    }
}

170
function get_string($identifier, $section='mahara') {
171 172 173 174 175

    $variables = func_get_args();
    if (count($variables) > 2) { // we have some stuff we need to sprintf
        array_shift($variables);
        array_shift($variables); //shift off the first two.
176 177
    }
    else {
178 179 180
        $variables = array();
    }
    
181 182 183
    return get_string_location($identifier, $section, $variables);
}

184 185 186 187 188 189 190 191 192 193 194 195 196 197 198
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);
}

199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
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) {

    $location = get_config('docroot') ;
    $file = 'help/';

    if ($plugintype != 'core') {
        $location .= $plugintype . '/' . $pluginname . '/lang/';
    }
    else {
        $location .= 'lang/';
    }
    if ($page) {
        $page = str_replace('-', '/', $page);
219 220 221 222 223 224
        if ($plugintype != 'core') {
            $file .=  'pages/' . $page . '.html';
        }
        else {
            $file .= 'pages/' . $pluginname . '/' . $page . '.html';
        } 
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
    }
    else if ($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
    $langfile = $location . $lang . '/' . $file;
    if (is_readable($langfile)) {
        return $langfile;
    }

    // if it's not found, try the parent language if there is one...
    if (empty($data) && empty($trieden)) {
256
        $langfile = get_config('docroot') . 'lang/' . $lang . '/langconfig.php';
257 258 259 260
        if ($parentlang = get_string_from_file('parentlanguage', $langfile)) {
            if ($parentlang == 'en.utf8') {
                $trieden = true;
            }
261
            $langfile = get_config('docroot') . 'lang/' . $parentlang . '/' . $file;
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277
            if (is_readable($langfile)) {
                return $langfile;
            }
        }
    }

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

278 279 280 281 282
// get a string without sprintfing it.
function get_raw_string($identifier, $section='mahara') {
    // For a raw string we don't want to format any arguments using
    // sprintf, so the replace function passed to get_string_location
    // should just return the first argument and ignore the second.
283 284
    return get_string_location($identifier, $section, array(), 
                               create_function('$string, $args','return $string;'));
285 286 287 288 289 290 291 292 293 294 295 296 297 298
}


/**
 * 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 $replacefunc
 * @return string
 */
299
function get_string_location($identifier, $section, $variables, $replacefunc='format_langstring', $lang='') {
300 301 302 303

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

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

310 311 312
    if (empty($lang)) {
        $lang = current_language();
    }
313 314 315 316 317

    // Define the locations of language strings for this section
    $docroot = get_config('docroot');
    $locations = array();
    
318
    if (false === strpos($section, '.')) {
319 320 321 322
        $locations[] = $docroot . 'lang/';
    }
    else {
        $extras = plugin_types(); // more later..
323
        foreach ($extras as $tocheck) {
324
            if (strpos($section, $tocheck . '.') === 0) {
Nigel McNie's avatar
Nigel McNie committed
325
                $pluginname = substr($section ,strlen($tocheck) + 1);
326 327 328
                if ($tocheck == 'blocktype' && 
                    strpos($pluginname, '/') !== false) { // it belongs to an artefact plugin
                    $bits = explode('/', $pluginname);
329 330
                    $locations[] = $docroot . 'artefact/' . $bits[0] . '/blocktype/' . $bits[1] . '/lang/';
                    $section = 'blocktype.' . $bits[1];
331 332 333 334
                }
                else {
                    $locations[] = $docroot . $tocheck . '/' . $pluginname . '/lang/';
                }
335 336 337
            }
        }
    }
338

339 340 341
    // First check all the normal locations for the string in the current language
    foreach ($locations as $location) {
        //if local directory not found, or particular string does not exist in local direcotry
342
        $langfile = $location . $lang . '/' . $section . '.php';
Penny Leach's avatar
Penny Leach committed
343
        if (is_readable($langfile)) {
344
            if ($result = get_string_from_file($identifier, $langfile)) {
345
                return $replacefunc($result, $variables);
346 347 348 349 350 351 352
            }
        }
    }

    // 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') {
353
        return '[[' . $identifier . '/' . $section . ']]';
354 355 356 357
    }

    // Is a parent language defined?  If so, try to find this string in a parent language file
    foreach ($locations as $location) {
358
        $langfile = $location . $lang . '/langconfig.php';
Penny Leach's avatar
Penny Leach committed
359
        if (is_readable($langfile)) {
360
            if ($parentlang = get_string_from_file('parentlanguage', $langfile)) {
361
                $langfile = $location . $parentlang . '/' . $section . '.php';
Penny Leach's avatar
Penny Leach committed
362
                if (is_readable($langfile)) {
363
                    if ($result = get_string_from_file($identifier, $langfile)) {
364
                        return $replacefunc($result, $variables);
365 366 367 368 369 370 371 372 373
                    }
                }
            }
        }
    }

    /// Our only remaining option is to try English
    foreach ($locations as $location) {
        //if local_en not found, or string not found in local_en
374
        $langfile = $location . 'en.utf8/' . $section . '.php';
Penny Leach's avatar
Penny Leach committed
375
        if (is_readable($langfile)) {
376
            if ($result = get_string_from_file($identifier, $langfile)) {
377
                return $replacefunc($result, $variables);
378 379 380 381
            }
        }
    }

382
    return '[[' . $identifier . '/' . $section . ']]';  // Last resort
383
}
384 385


386 387 388 389 390 391 392 393
/**
 * Return a list of available languages
 *
 */
function get_languages() {
    $langs = array();
    $langbase = get_config('docroot') . 'lang/';
    if (!$langdir = opendir($langbase)) {
394
        throw new SystemException('Unable to read language directory '.$langbase);
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416
    }
    while (false !== ($subdir = readdir($langdir))) {
        $langfile = $langbase . $subdir . '/langconfig.php';
        if ($subdir != "." && $subdir != ".." && is_readable($langfile)) {
            if ($langname = get_string_from_file('thislanguage',$langfile)) {
                $langs[$subdir] = $langname;
            }
        }
    }
    closedir($langdir);
    return $langs;
}

/**
 * Return a list of available themes
 * Need to add the theme names sometime; for now use get_string().
 *
 */
function get_themes() {
    $themes = array();
    $themebase = get_config('docroot') . 'theme/';
    if (!$themedir = opendir($themebase)) {
417
        throw new SystemException('Unable to read theme directory '.$themebase);
418 419
    }
    while (false !== ($subdir = readdir($themedir))) {
420
        if ($subdir != "." && $subdir != ".." && is_dir($themebase . $subdir)) {
421 422
            $themes[$subdir] = $subdir;

423
            $config_path = $themebase . $subdir . '/config.php';
424 425 426 427 428 429
            if (is_readable($config_path)) {
                require_once($config_path);
                if (isset($theme->name)) {
                    $themes[$subdir] = $theme->name;
                }
            }
430 431 432 433 434 435 436
        }
    }
    closedir($themedir);
    return $themes;
}


437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474
/**
 * 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
 *
475
 * @param string $ini_get_arg setting to look for
476 477 478 479 480 481 482 483 484 485 486
 * @return bool
 */
function ini_get_bool($ini_get_arg) {
    $temp = ini_get($ini_get_arg);

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

487 488 489 490 491 492 493 494 495 496
/**
 * 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;
    
497
    $dbconfig = get_records_array('config', '', '', '', 'field, value');
498 499
    
    foreach ($dbconfig as $cfg) {
500
        if (isset($CFG->{$cfg->field}) && $CFG->{$cfg->field} != $cfg->value) {
Penny Leach's avatar
Penny Leach committed
501
            // @todo warn that we're overriding db config with $CFG
502 503 504 505 506 507 508 509 510
            continue;
        }
        $CFG->{$cfg->field} = $cfg->value;
    }

    return true;
}

/**
511 512 513 514 515 516
 * This function returns a value from $CFG
 * or null if it is not found
 * 
 * @param string $key config setting to look for 
 * @return mixed
 */
517 518
function get_config($key) {
    global $CFG;
519
    if (isset($CFG->$key)) {
520 521 522 523 524
        return $CFG->$key;
    }
    return null;
}

525 526 527 528 529 530 531 532 533

/**
 * 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) {
534 535
    global $CFG;

536
    db_ignore_sql_exceptions(true);
537 538
    if (get_record('config', 'field', $key)) {
        if (set_field('config', 'value', $value, 'field', $key)) {
Penny Leach's avatar
Penny Leach committed
539 540 541 542 543 544 545
            $status = true;
        }
    } 
    else {
        $config = new StdClass;
        $config->field = $key;
        $config->value = $value;
546
        $status = insert_record('config', $config);
Penny Leach's avatar
Penny Leach committed
547
    }
548
    db_ignore_sql_exceptions(false);
Penny Leach's avatar
Penny Leach committed
549 550

    if (!empty($status)) {
551 552 553
        $CFG->{$key} = $value;
        return true;
    }
Penny Leach's avatar
Penny Leach committed
554

555 556 557 558 559 560 561 562 563 564 565 566 567 568
    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;
569

570 571
    // Suppress NOTICE with @ in case $key is not yet cached
    @$value = $CFG->plugin->{$plugintype}->{$pluginname}->{$key};
572
    if (isset($value)) {
573 574 575 576
        return $value;
    }

    $records = get_records_array($plugintype . '_config', 'plugin', $pluginname, 'field', 'field, value');
577
    if (!empty($records)) {
578 579
        foreach($records as $record) {
            $CFG->plugin->{$plugintype}->{$pluginname}->{$record->field} = $record->value;
580
            if ($record->field == $key) {
581 582 583
                $value = $record->value;
            }
        }
584 585
    }

586 587 588
    return $value;
}

Penny Leach's avatar
Penny Leach committed
589
function set_config_plugin($plugintype, $pluginname, $key, $value) {
590
    global $CFG;
591
    $table = $plugintype . '_config';
Penny Leach's avatar
Penny Leach committed
592

593 594 595
    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
596 597 598 599 600 601 602 603
            $status = true;
        }
    }
    else {
        $pconfig = new StdClass;
        $pconfig->plugin = $pluginname;
        $pconfig->field  = $key;
        $pconfig->value  = $value;
604
        $status = insert_record($table, $pconfig);
Penny Leach's avatar
Penny Leach committed
605 606 607 608 609 610 611 612
    }
    if ($status) {
        $CFG->plugin->{$plugintype}->{$pluginname}->{$key} = $value;
        return true;
    }
    return false;
}

613 614 615 616 617 618 619 620 621 622
/**
 * 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 $key          The config setting to look for
 */
623
function get_config_plugin_instance($plugintype, $pluginid, $key) {
624 625 626 627 628 629
    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 $key is not yet cached
630
    @$value = $CFG->plugin->{$plugintype}->{$instance}->{$key};
631
    if (isset($value)) {
632 633 634
        return $value;
    }

635
    $records = get_records_array($plugintype . '_instance_config', 'instance', $pluginid, 'field', 'field, value');
636
    if (!empty($records)) {
637
        foreach($records as $record) {
638
            $CFG->plugin->{$plugintype}->{$instance}->{$record->field} = $record->value;
639
            if ($record->field == $key) {
640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
                $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;
}

683
/**
684 685 686 687 688
 * This function prints an array or object
 * wrapped inside <pre></pre>
 * 
 * @param $mixed value to print
 */
689 690 691 692 693 694
function print_object($mixed) {
    echo '<pre>';
    print_r($mixed);
    echo '</pre>';
}

695
/**
696 697 698 699 700 701
 * This function returns the current 
 * language to use, either for a given user
 * or sitewide, or the default
 * 
 * @return string
 */
702 703
function current_language() {
    global $USER, $CFG;
704 705 706 707 708
    if ($USER instanceof User) {
        $lang = $USER->get_account_preference('lang');
        if ($lang !== null && $lang != 'default') {
            return $lang;
        }
709 710 711 712 713 714 715
    }
    if (!empty($CFG->lang)) {
        return $CFG->lang;
    }
    return 'en.utf8';
}

716
/**
717 718 719 720 721 722
 * Helper function to sprintf language strings
 * with a variable number of arguments
 * 
 * @param string $string raw string to use
 * @param array $args arguments to sprintf
 */
723 724 725 726
function format_langstring($string,$args) {
    return call_user_func_array('sprintf',array_merge(array($string),$args));
}

727 728 729 730 731 732 733 734 735 736 737 738 739
/**
 * 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);
}

740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
/**
 * 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 {
            umask(0000); 
758
            $status = @mkdir($dir, 0777, true);
Nigel McNie's avatar
Nigel McNie committed
759
            // @todo has the umask been clobbered at this point, and is this a bad thing?
760 761 762 763 764
        }
    }
    return $status;
}

Penny Leach's avatar
Penny Leach committed
765 766 767
/**
 * Function to require a plugin file. This is to avoid doing 
 * require and include directly with variables.
768
 *
Penny Leach's avatar
Penny Leach committed
769 770
 * This function is the one safe point to require plugin files.
 * so USE it :)
771
 *
Penny Leach's avatar
Penny Leach committed
772 773 774 775 776 777
 * @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 $nonfatal (optional, defaults to false) just returns false if the file doesn't exist
 */
778
function safe_require($plugintype, $pluginname, $filename='lib.php', $function='require_once', $nonfatal=false) {
779 780 781 782
    $plugintypes = plugin_types();
    if (!in_array($plugintype, $plugintypes)) {
        throw new Exception("\"$plugintype\" is not a valid plugin type");
    }
783 784
    require_once(get_config('docroot') . $plugintype . '/lib.php');

785
    if (!in_array($function,array('require', 'include', 'require_once', 'include_once'))) {
Penny Leach's avatar
Penny Leach committed
786 787 788 789 790 791
        if (!empty($nonfatal)) {
            return false;
        }
        throw new Exception ('invalid require type');
    }

792 793 794 795 796
    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] . '/' . $filename;
        }
797
        else {
798
            if (table_exists(new XMLDBTable('blocktype_installed'))) {
799 800 801 802 803
                if ($artefactplugin = get_field('blocktype_installed', 'artefactplugin', 'name', $pluginname)) {
                    $fullpath = get_config('docroot') . 'artefact/' . $artefactplugin . '/blocktype/' . $pluginname . '/'. $filename;
                }
            }
        }
804 805 806 807 808
    } 
    if (empty($fullpath)) {
        $fullpath = get_config('docroot') . $plugintype . '/' . $pluginname . '/' . $filename;
    }

Penny Leach's avatar
Penny Leach committed
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
    if (!$realpath = realpath($fullpath)) {
        if (!empty($nonfatal)) {
            return false;
        }
        throw new Exception ("File $fullpath did not exist");
    }

    if (strpos($realpath, get_config('docroot') !== 0)) {
        if (!empty($nonfatal)) {
            return false;
        }
        throw new Exception ("File $fullpath was outside document root!");
    }

    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); }
    
}

830 831 832 833 834 835 836
/**
 * This function returns the list of plugintypes we currently care about
 * @return array of names
 */
function plugin_types() {
    static $pluginstocheck;
    if (empty($pluginstocheck)) {
837
        // ORDER MATTERS! artefact has to be first!
838
        $pluginstocheck = array('artefact', 'auth', 'notification', 'search', 'blocktype', 'interaction');
839 840 841 842
    }
    return $pluginstocheck;
}

843 844 845 846 847 848 849
/** 
 * This return returns the names of plugins installed 
 * for the given plugin type.
 * 
 * @param string $plugintype type of plugin
 */
function plugins_installed($plugintype) {
850
    return get_records_array($plugintype . '_installed');
851 852
}

853 854 855 856 857 858 859 860
/**
 * 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($args);
861
    return call_user_func_array(array($class, $method), $args);
862 863
}

864 865
function generate_class_name() {
    $args = func_get_args();
866
    if (count($args) == 2 && $args[0] == 'blocktype') {
867
        return 'PluginBlocktype' . ucfirst(blocktype_namespaced_to_single($args[1]));
868
    }
869 870 871
    return 'Plugin' . implode('', array_map('ucfirst', $args));
}

872 873 874 875
function generate_artefact_class_name($type) {
    return 'ArtefactType' . ucfirst($type);
}

876 877 878 879
function generate_interaction_instance_class_name($type) {
    return 'Interaction' . ucfirst($type) . 'Instance';
}

880 881 882 883 884 885 886 887 888 889 890 891
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;
892 893
}

894

895 896 897 898 899
/**
 * 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
900
        throw new Exception("Invalid event");
Penny Leach's avatar
Penny Leach committed
901
    }
902

903
    if ($data instanceof ArtefactType || $data instanceof BlockInstance) {
904 905 906
        // leave it alone
    }
    else if (is_object($data)) {
907 908
        $data = (array)$data;
    }
909
    else if (is_numeric($data)) {
910 911 912
        $data = array('id' => $data);
    }

913 914 915
    // this is here because the core can't listen to events
    // @todo, this is VERY ugly, and someone should fix it
    if ($event == 'createuser') {
916
        activity_set_defaults($data['id']);
917 918
    }

Penny Leach's avatar
Penny Leach committed
919 920
    $plugintypes = plugin_types();
    foreach ($plugintypes as $name) {
921
        if ($subs = get_records_array($name . '_event_subscription', 'event', $event)) {
Penny Leach's avatar
Penny Leach committed
922
            foreach ($subs as $sub) {
923
                safe_require($name, $sub->plugin);
Penny Leach's avatar
Penny Leach committed
924 925
                $classname = 'Plugin' . ucfirst($name) . ucfirst($sub->plugin);
                try {
926
                    call_static_method($classname, $sub->callfunction, $event, $data);
Penny Leach's avatar
Penny Leach committed
927 928 929 930 931 932 933 934 935 936
                }
                catch (Exception $e) {
                    log_warn("Event $event caused an exception from plugin $classname "
                             . "with function $sub->callfunction. Continuing with event handlers");
                }
            }
        }
    }
}

937 938 939 940 941 942 943 944 945 946 947 948 949 950
/**
 * 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
951 952
/** 
 * Adds stuff to the log
953
 * @todo write this function
Penny Leach's avatar
Penny Leach committed
954 955 956 957 958 959 960 961 962 963 964 965
 *
 * @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) {

}

966 967 968 969
/**
 * Used by XMLDB
 */
function debugging ($message, $level) {
970
    log_debug($message);
971 972 973 974 975 976
}
function xmldb_dbg($message) {
    log_warn($message);
}
define('DEBUG_DEVELOPER', 'whocares');

977 978 979
/** 
 * Base class for all plugintypes.
 */
980
class Plugin {
981
    
982 983
    /**
     * This function returns an array of crons it wants to have run
984
     * Each item should be a StdClass object containing - 
985 986 987 988
     * - callfunction (static function on the Plugin Class)
     * - any or all of minute, hour, day, month, dayofweek 
     * (will default to * if not supplied)
     */
989 990 991 992
    public static function get_cron() {
        return array();
    }

993 994 995 996 997 998 999
    /** 
     * 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
     */
1000 1001 1002 1003
    public static function get_event_subscriptions() {
        return array();
    }

1004 1005 1006 1007 1008 1009 1010

    /**
     * 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) {
1011 1012
        return true;
    }
1013

1014 1015 1016 1017 1018
    /**
     * Whether this plugin has admin plugin config options.
     * If you return true here, you must supply a valid pieform
     * in {@link get_config}
     */
1019 1020 1021
    public static function has_config() {
        return false;
    }
1022 1023 1024 1025 1026 1027 1028 1029 1030

    /**
    * 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();
    }
1031 1032
}

1033 1034 1035 1036 1037
/**
 * 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
1038 1039
 * @param string $notspecifiedkey (optional) language key to fetch 'not specified string' from
 * @param string $notspecifiedsection (optional) language section to fetch 'not specified string' from
1040 1041 1042 1043
 * (see langconfig.php or the top of {@link get_string_location}
 * for supported keys
 */

1044
function format_date($date, $formatkey='strftimedatetime', $notspecifiedkey='strftimenotspecified', $notspecifiedsection='mahara') {
1045
    if (empty($date)) {
1046
        return get_string($notspecifiedkey, $notspecifiedsection);
1047
    }
1048 1049 1050
    return strftime(get_string($formatkey), $date);
}

1051 1052 1053
/**
 * Returns a random string suitable for registration/change password requests
 *
1054
 * @param int $length The length of the key to return
1055 1056
 * @return string
 */
1057 1058 1059 1060
function get_random_key($length=16) {
    if ($length < 1) {
        throw new IllegalArgumentException('Length must be a positive number');
    }
1061 1062 1063 1064 1065 1066 1067
    $pool = array_merge(
        range('A', 'Z'),
        range('a', 'z'),
        range(0, 9)
    );
    shuffle($pool);
    $result = '';
1068
    for ($i = 0; $i < $length; $i++) {
1069 1070 1071 1072 1073
        $result .= $pool[$i];
    }
    return $result;
}

1074

1075 1076 1077 1078
//
// Pieform related functions
//

1079 1080 1081
/**
 * Configures a default form
 */
1082
function pieform_configure() {
1083
    global $USER;
1084
    return array(
1085 1086
        'method'    => 'post',
        'action'    => '',
1087
        'language'  => current_language(),
1088
        'autofocus' => true,
1089
        'renderer'  => 'maharatable',
1090
        'requiredmarker' => true,
Nigel McNie's avatar
Nigel McNie committed
1091
        'elementclasses' => true,
1092 1093 1094 1095 1096 1097
        'jserrorcallback'       => 'formError',
        'globaljserrorcallback' => 'formGlobalError',
        'jssuccesscallback'     => 'formSuccess',
        'presubmitcallback'     => 'formStartProcessing',
        'postsubmitcallback'    => 'formStopProcessing',
        'jserrormessage' => get_string('errorprocessingform'),
1098
        'configdirs' => get_config('libroot') . 'form/',
1099
        'helpcallback' => 'pieform_get_help',
1100
        'elements'   => array(
1101
            'sesskey' => array(
1102
                'type'  => 'hidden',
1103
                'value' => $USER->get('sesskey')
1104 1105 1106 1107 1108
            )
        )
    );
}

1109 1110 1111 1112 1113
function pieform_validate(Pieform $form, $values) {
    global $USER;
    if (!isset($values['sesskey'])) {
        throw new UserException('No session key');
    }
1114
    if ($USER && $USER->is_logged_in() && $USER->get('sesskey') != $values['sesskey']) {
1115 1116 1117 1118 1119
        throw new UserException('Invalid session key');
    }

    // Check to make sure the user has not been suspended, so that they cannot
    // perform any action
1120 1121
    if ($USER) {
        $record = get_record_sql('SELECT suspendedctime, suspendedreason
1122
            FROM {usr}
1123 1124 1125 1126
            WHERE id = ?', array($USER->get('id')));
        if ($record && $record->suspendedctime) {
            throw new UserException(get_string('accountsuspended', 'mahara', $record->suspendedctime, $record->suspendedreason));
        }
1127 1128 1129
    }
}

1130
function pieform_element_calendar_configure($element) {