MDL-36901: Remove system paths from exceptions
[moodle.git] / lib / setuplib.php
CommitLineData
b37eac91 1<?php
b37eac91 2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
16
b37eac91 17/**
18 * These functions are required very early in the Moodle
19 * setup process, before any of the main libraries are
20 * loaded.
30fa50d0 21 *
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22 * @package core
23 * @subpackage lib
24 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
25 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
b37eac91 26 */
d3f9f1f8 27
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28defined('MOODLE_INTERNAL') || die();
29
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30// Debug levels - always keep the values in ascending order!
31/** No warnings and errors at all */
0f0f0768 32define('DEBUG_NONE', 0);
e63f95d7
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33/** Fatal errors only */
34define('DEBUG_MINIMAL', E_ERROR | E_PARSE);
35/** Errors, warnings and notices */
36define('DEBUG_NORMAL', E_ERROR | E_PARSE | E_WARNING | E_NOTICE);
37/** All problems except strict PHP warnings */
38define('DEBUG_ALL', E_ALL & ~E_STRICT);
39/** DEBUG_ALL with all debug messages and strict warnings */
40define('DEBUG_DEVELOPER', E_ALL | E_STRICT);
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41
42/** Remove any memory limits */
43define('MEMORY_UNLIMITED', -1);
44/** Standard memory limit for given platform */
45define('MEMORY_STANDARD', -2);
46/**
47 * Large memory limit for given platform - used in cron, upgrade, and other places that need a lot of memory.
48 * Can be overridden with $CFG->extramemorylimit setting.
49 */
50define('MEMORY_EXTRA', -3);
51/** Extremely large memory limit - not recommended for standard scripts */
52define('MEMORY_HUGE', -4);
c84a2dbe 53
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54/**
55 * Software maturity levels used by the core and plugins
56 */
57define('MATURITY_ALPHA', 50); // internals can be tested using white box techniques
58define('MATURITY_BETA', 100); // feature complete, ready for preview and testing
59define('MATURITY_RC', 150); // tested, will be released unless there are fatal bugs
60define('MATURITY_STABLE', 200); // ready for production deployment
61
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62/**
63 * Special value that can be used in $plugin->dependencies in version.php files.
64 */
65define('ANY_VERSION', 'any');
66
67
6a525ce2 68/**
b08b3569 69 * Simple class. It is usually used instead of stdClass because it looks
1387fcdd 70 * more familiar to Java developers ;-) Do not use for type checking of
4f92410f 71 * function parameters. Please use stdClass instead.
b37eac91 72 *
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73 * @package core
74 * @subpackage lib
75 * @copyright 2009 Petr Skoda {@link http://skodak.org}
76 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
4f92410f 77 * @deprecated since 2.0
6a525ce2 78 */
b08b3569 79class object extends stdClass {};
6a525ce2 80
251387d0 81/**
82 * Base Moodle Exception class
b37eac91 83 *
c84a2dbe 84 * Although this class is defined here, you cannot throw a moodle_exception until
85 * after moodlelib.php has been included (which will happen very soon).
86 *
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87 * @package core
88 * @subpackage lib
89 * @copyright 2008 Petr Skoda {@link http://skodak.org}
90 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
251387d0 91 */
92class moodle_exception extends Exception {
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93
94 /**
95 * @var string The name of the string from error.php to print
96 */
251387d0 97 public $errorcode;
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98
99 /**
100 * @var string The name of module
101 */
251387d0 102 public $module;
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103
104 /**
105 * @var mixed Extra words and phrases that might be required in the error string
106 */
251387d0 107 public $a;
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108
109 /**
110 * @var string The url where the user will be prompted to continue. If no url is provided the user will be directed to the site index page.
111 */
251387d0 112 public $link;
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113
114 /**
115 * @var string Optional information to aid the debugging process
116 */
eee5d9bb 117 public $debuginfo;
251387d0 118
119 /**
120 * Constructor
121 * @param string $errorcode The name of the string from error.php to print
122 * @param string $module name of module
123 * @param string $link The url where the user will be prompted to continue. If no url is provided the user will be directed to the site index page.
34223e03 124 * @param mixed $a Extra words and phrases that might be required in the error string
eee5d9bb 125 * @param string $debuginfo optional debugging information
251387d0 126 */
5ca18631 127 function __construct($errorcode, $module='', $link='', $a=NULL, $debuginfo=null) {
128 if (empty($module) || $module == 'moodle' || $module == 'core') {
251387d0 129 $module = 'error';
130 }
131
5ca18631 132 $this->errorcode = $errorcode;
133 $this->module = $module;
134 $this->link = $link;
135 $this->a = $a;
98984c09 136 $this->debuginfo = is_null($debuginfo) ? null : (string)$debuginfo;
251387d0 137
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138 if (get_string_manager()->string_exists($errorcode, $module)) {
139 $message = get_string($errorcode, $module, $a);
8d37c9b2 140 $haserrorstring = true;
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141 } else {
142 $message = $module . '/' . $errorcode;
8d37c9b2 143 $haserrorstring = false;
4f6be42c 144 }
251387d0 145
94a994b4 146 if (defined('PHPUNIT_TEST') and PHPUNIT_TEST and $debuginfo) {
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147 $message = "$message ($debuginfo)";
148 }
149
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150 if (!$haserrorstring and defined('PHPUNIT_TEST') and PHPUNIT_TEST) {
151 // Append the contents of $a to $debuginfo so helpful information isn't lost.
152 // This emulates what {@link get_exception_info()} does. Unfortunately that
153 // function is not used by phpunit.
154 $message .= PHP_EOL.'$a contents: '.print_r($a, true);
155 }
156
251387d0 157 parent::__construct($message, 0);
158 }
159}
160
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161/**
162 * Course/activity access exception.
163 *
164 * This exception is thrown from require_login()
47d2216e 165 *
f76249cc 166 * @package core_access
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167 * @copyright 2010 Petr Skoda {@link http://skodak.org}
168 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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169 */
170class require_login_exception extends moodle_exception {
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171 /**
172 * Constructor
173 * @param string $debuginfo Information to aid the debugging process
174 */
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175 function __construct($debuginfo) {
176 parent::__construct('requireloginerror', 'error', '', NULL, $debuginfo);
177 }
178}
179
559a5dbd 180/**
181 * Web service parameter exception class
92fe97f9 182 * @deprecated since Moodle 2.2 - use moodle exception instead
559a5dbd 183 * This exception must be thrown to the web service client when a web service parameter is invalid
184 * The error string is gotten from webservice.php
185 */
186class webservice_parameter_exception extends moodle_exception {
187 /**
188 * Constructor
189 * @param string $errorcode The name of the string from webservice.php to print
190 * @param string $a The name of the parameter
34223e03 191 * @param string $debuginfo Optional information to aid debugging
559a5dbd 192 */
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193 function __construct($errorcode=null, $a = '', $debuginfo = null) {
194 parent::__construct($errorcode, 'webservice', '', $a, $debuginfo);
559a5dbd 195 }
196}
197
9a0df45a 198/**
199 * Exceptions indicating user does not have permissions to do something
200 * and the execution can not continue.
47d2216e 201 *
f76249cc 202 * @package core_access
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203 * @copyright 2009 Petr Skoda {@link http://skodak.org}
204 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
9a0df45a 205 */
206class required_capability_exception extends moodle_exception {
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207 /**
208 * Constructor
209 * @param context $context The context used for the capability check
210 * @param string $capability The required capability
211 * @param string $errormessage The error message to show the user
212 * @param string $stringfile
213 */
9a0df45a 214 function __construct($context, $capability, $errormessage, $stringfile) {
215 $capabilityname = get_capability_string($capability);
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216 if ($context->contextlevel == CONTEXT_MODULE and preg_match('/:view$/', $capability)) {
217 // we can not go to mod/xx/view.php because we most probably do not have cap to view it, let's go to course instead
d197ea43 218 $paranetcontext = context::instance_by_id(get_parent_contextid($context));
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219 $link = get_context_url($paranetcontext);
220 } else {
221 $link = get_context_url($context);
222 }
223 parent::__construct($errormessage, $stringfile, $link, $capabilityname);
9a0df45a 224 }
225}
226
655bbf51 227/**
cce1b0b9 228 * Exception indicating programming error, must be fixed by a programer. For example
229 * a core API might throw this type of exception if a plugin calls it incorrectly.
b37eac91 230 *
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231 * @package core
232 * @subpackage lib
233 * @copyright 2008 Petr Skoda {@link http://skodak.org}
234 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
655bbf51 235 */
236class coding_exception extends moodle_exception {
655bbf51 237 /**
238 * Constructor
239 * @param string $hint short description of problem
240 * @param string $debuginfo detailed information how to fix problem
241 */
242 function __construct($hint, $debuginfo=null) {
243 parent::__construct('codingerror', 'debug', '', $hint, $debuginfo);
a3f7cbf6 244 }
245}
246
247/**
248 * Exception indicating malformed parameter problem.
249 * This exception is not supposed to be thrown when processing
250 * user submitted data in forms. It is more suitable
251 * for WS and other low level stuff.
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252 *
253 * @package core
254 * @subpackage lib
255 * @copyright 2009 Petr Skoda {@link http://skodak.org}
256 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
a3f7cbf6 257 */
258class invalid_parameter_exception extends moodle_exception {
259 /**
260 * Constructor
261 * @param string $debuginfo some detailed information
262 */
263 function __construct($debuginfo=null) {
264 parent::__construct('invalidparameter', 'debug', '', null, $debuginfo);
655bbf51 265 }
266}
267
d07ff72d 268/**
269 * Exception indicating malformed response problem.
270 * This exception is not supposed to be thrown when processing
271 * user submitted data in forms. It is more suitable
272 * for WS and other low level stuff.
273 */
274class invalid_response_exception extends moodle_exception {
275 /**
276 * Constructor
277 * @param string $debuginfo some detailed information
278 */
279 function __construct($debuginfo=null) {
280 parent::__construct('invalidresponse', 'debug', '', null, $debuginfo);
281 }
282}
283
cce1b0b9 284/**
1387fcdd 285 * An exception that indicates something really weird happened. For example,
cce1b0b9 286 * if you do switch ($context->contextlevel), and have one case for each
287 * CONTEXT_... constant. You might throw an invalid_state_exception in the
f630a546 288 * default case, to just in case something really weird is going on, and
8dc0ae8f 289 * $context->contextlevel is invalid - rather than ignoring this possibility.
b37eac91 290 *
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291 * @package core
292 * @subpackage lib
293 * @copyright 2009 onwards Martin Dougiamas {@link http://moodle.com}
294 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
cce1b0b9 295 */
296class invalid_state_exception extends moodle_exception {
297 /**
298 * Constructor
299 * @param string $hint short description of problem
300 * @param string $debuginfo optional more detailed information
301 */
302 function __construct($hint, $debuginfo=null) {
303 parent::__construct('invalidstatedetected', 'debug', '', $hint, $debuginfo);
304 }
305}
306
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307/**
308 * An exception that indicates incorrect permissions in $CFG->dataroot
309 *
310 * @package core
311 * @subpackage lib
312 * @copyright 2010 Petr Skoda {@link http://skodak.org}
313 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
314 */
315class invalid_dataroot_permissions extends moodle_exception {
316 /**
317 * Constructor
318 * @param string $debuginfo optional more detailed information
319 */
320 function __construct($debuginfo = NULL) {
321 parent::__construct('invaliddatarootpermissions', 'error', '', NULL, $debuginfo);
322 }
323}
324
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325/**
326 * An exception that indicates that file can not be served
327 *
328 * @package core
329 * @subpackage lib
330 * @copyright 2010 Petr Skoda {@link http://skodak.org}
331 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
332 */
333class file_serving_exception extends moodle_exception {
334 /**
335 * Constructor
336 * @param string $debuginfo optional more detailed information
337 */
338 function __construct($debuginfo = NULL) {
339 parent::__construct('cannotservefile', 'error', '', NULL, $debuginfo);
340 }
341}
342
251387d0 343/**
1387fcdd 344 * Default exception handler, uncaught exceptions are equivalent to error() in 1.9 and earlier
fd1a792e 345 *
30fa50d0 346 * @param Exception $ex
c19bc39c 347 * @return void -does not return. Terminates execution!
251387d0 348 */
c19bc39c 349function default_exception_handler($ex) {
f0202ae9 350 global $CFG, $DB, $OUTPUT, $USER, $FULLME, $SESSION, $PAGE;
1fbdf76d 351
352 // detect active db transactions, rollback and log as error
695c5ec4 353 abort_all_db_transactions();
1fe1d104 354
d9e07264 355 if (($ex instanceof required_capability_exception) && !CLI_SCRIPT && !AJAX_SCRIPT && !empty($CFG->autologinguests) && !empty($USER->autologinguest)) {
f0202ae9 356 $SESSION->wantsurl = qualified_me();
d9e07264
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357 redirect(get_login_url());
358 }
359
c19bc39c 360 $info = get_exception_info($ex);
34a2777c 361
c19bc39c 362 if (debugging('', DEBUG_MINIMAL)) {
2e9b772f 363 $logerrmsg = "Default exception handler: ".$info->message.' Debug: '.$info->debuginfo."\n".format_backtrace($info->backtrace, true);
695c5ec4 364 error_log($logerrmsg);
fd1a792e 365 }
366
c19bc39c 367 if (is_early_init($info->backtrace)) {
e9e567f3 368 echo bootstrap_renderer::early_error($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo, $info->errorcode);
b7009474 369 } else {
3c1ea58b 370 try {
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371 if ($DB) {
372 // If you enable db debugging and exception is thrown, the print footer prints a lot of rubbish
373 $DB->set_debug(0);
374 }
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375 echo $OUTPUT->fatal_error($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo);
376 } catch (Exception $out_ex) {
377 // default exception handler MUST not throw any exceptions!!
2e9b772f 378 // the problem here is we do not know if page already started or not, we only know that somebody messed up in outputlib or theme
3c1ea58b 379 // so we just print at least something instead of "Exception thrown without a stack frame in Unknown on line 0":-(
1adaa404
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380 if (CLI_SCRIPT or AJAX_SCRIPT) {
381 // just ignore the error and send something back using the safest method
e9e567f3 382 echo bootstrap_renderer::early_error($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo, $info->errorcode);
1adaa404
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383 } else {
384 echo bootstrap_renderer::early_error_content($info->message, $info->moreinfourl, $info->link, $info->backtrace, $info->debuginfo);
385 $outinfo = get_exception_info($out_ex);
386 echo bootstrap_renderer::early_error_content($outinfo->message, $outinfo->moreinfourl, $outinfo->link, $outinfo->backtrace, $outinfo->debuginfo);
387 }
3c1ea58b 388 }
7544d13c 389 }
390
34a2777c 391 exit(1); // General error code
392}
393
85ba1e78
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394/**
395 * Default error handler, prevents some white screens.
396 * @param int $errno
397 * @param string $errstr
398 * @param string $errfile
399 * @param int $errline
400 * @param array $errcontext
401 * @return bool false means use default error handler
402 */
403function default_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
404 if ($errno == 4096) {
405 //fatal catchable error
406 throw new coding_exception('PHP catchable fatal error', $errstr);
407 }
408 return false;
409}
410
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411/**
412 * Unconditionally abort all database transactions, this function
413 * should be called from exception handlers only.
414 * @return void
415 */
416function abort_all_db_transactions() {
417 global $CFG, $DB, $SCRIPT;
418
d5a8d9aa 419 // default exception handler MUST not throw any exceptions!!
03221650 420
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421 if ($DB && $DB->is_transaction_started()) {
422 error_log('Database transaction aborted automatically in ' . $CFG->dirroot . $SCRIPT);
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423 // note: transaction blocks should never change current $_SESSION
424 $DB->force_transaction_rollback();
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425 }
426}
427
b7009474 428/**
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429 * This function encapsulates the tests for whether an exception was thrown in
430 * early init -- either during setup.php or during init of $OUTPUT.
b7009474 431 *
432 * If another exception is thrown then, and if we do not take special measures,
433 * we would just get a very cryptic message "Exception thrown without a stack
434 * frame in Unknown on line 0". That makes debugging very hard, so we do take
435 * special measures in default_exception_handler, with the help of this function.
436 *
437 * @param array $backtrace the stack trace to analyse.
438 * @return boolean whether the stack trace is somewhere in output initialisation.
439 */
50764d37 440function is_early_init($backtrace) {
b7009474 441 $dangerouscode = array(
442 array('function' => 'header', 'type' => '->'),
443 array('class' => 'bootstrap_renderer'),
50764d37 444 array('file' => dirname(__FILE__).'/setup.php'),
b7009474 445 );
446 foreach ($backtrace as $stackframe) {
447 foreach ($dangerouscode as $pattern) {
448 $matches = true;
449 foreach ($pattern as $property => $value) {
450 if (!isset($stackframe[$property]) || $stackframe[$property] != $value) {
451 $matches = false;
452 }
453 }
454 if ($matches) {
455 return true;
456 }
457 }
458 }
459 return false;
460}
461
34a2777c 462/**
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463 * Abort execution by throwing of a general exception,
464 * default exception handler displays the error message in most cases.
34a2777c 465 *
466 * @param string $errorcode The name of the language string containing the error message.
467 * Normally this should be in the error.php lang file.
468 * @param string $module The language file to get the error message from.
469 * @param string $link The url where the user will be prompted to continue.
470 * If no url is provided the user will be directed to the site index page.
471 * @param object $a Extra words and phrases that might be required in the error string
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472 * @param string $debuginfo optional debugging information
473 * @return void, always throws exception!
34a2777c 474 */
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475function print_error($errorcode, $module = 'error', $link = '', $a = null, $debuginfo = null) {
476 throw new moodle_exception($errorcode, $module, $link, $a, $debuginfo);
34a2777c 477}
478
479/**
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480 * Returns detailed information about specified exception.
481 * @param exception $ex
482 * @return object
34a2777c 483 */
c19bc39c 484function get_exception_info($ex) {
34a2777c 485 global $CFG, $DB, $SESSION;
486
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PS
487 if ($ex instanceof moodle_exception) {
488 $errorcode = $ex->errorcode;
489 $module = $ex->module;
490 $a = $ex->a;
491 $link = $ex->link;
492 $debuginfo = $ex->debuginfo;
493 } else {
494 $errorcode = 'generalexceptionmessage';
495 $module = 'error';
496 $a = $ex->getMessage();
497 $link = '';
98984c09 498 $debuginfo = '';
34a2777c 499 }
500
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501 // Append the error code to the debug info to make grepping and googling easier
502 $debuginfo .= PHP_EOL."Error code: $errorcode";
503
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504 $backtrace = $ex->getTrace();
505 $place = array('file'=>$ex->getFile(), 'line'=>$ex->getLine(), 'exception'=>get_class($ex));
506 array_unshift($backtrace, $place);
507
c84a2dbe 508 // Be careful, no guarantee moodlelib.php is loaded.
34a2777c 509 if (empty($module) || $module == 'moodle' || $module == 'core') {
510 $module = 'error';
511 }
fb71453d
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512 // Search for the $errorcode's associated string
513 // If not found, append the contents of $a to $debuginfo so helpful information isn't lost
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DM
514 if (function_exists('get_string_manager')) {
515 if (get_string_manager()->string_exists($errorcode, $module)) {
516 $message = get_string($errorcode, $module, $a);
517 } elseif ($module == 'error' && get_string_manager()->string_exists($errorcode, 'moodle')) {
c84a2dbe 518 // Search in moodle file if error specified - needed for backwards compatibility
519 $message = get_string($errorcode, 'moodle', $a);
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520 } else {
521 $message = $module . '/' . $errorcode;
fb71453d 522 $debuginfo .= PHP_EOL.'$a contents: '.print_r($a, true);
c84a2dbe 523 }
524 } else {
525 $message = $module . '/' . $errorcode;
fb71453d 526 $debuginfo .= PHP_EOL.'$a contents: '.print_r($a, true);
c84a2dbe 527 }
528
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529 // Remove some absolute paths from message and debugging info.
530 $searches = array();
531 $replaces = array();
532 $cfgnames = array('tempdir', 'cachedir', 'themedir',
533 'langmenucachefile', 'langcacheroot', 'dataroot', 'dirroot');
534 foreach ($cfgnames as $cfgname) {
535 if (property_exists($CFG, $cfgname)) {
536 $searches[] = $CFG->$cfgname;
537 $replaces[] = "[$cfgname]";
538 }
539 }
540 if (!empty($searches)) {
541 $message = str_replace($searches, $replaces, $message);
542 $debuginfo = str_replace($searches, $replaces, $debuginfo);
543 }
544
c84a2dbe 545 // Be careful, no guarantee weblib.php is loaded.
546 if (function_exists('clean_text')) {
547 $message = clean_text($message);
548 } else {
549 $message = htmlspecialchars($message);
34a2777c 550 }
34a2777c 551
552 if (!empty($CFG->errordocroot)) {
eea3341d 553 $errordoclink = $CFG->errordocroot . '/en/';
34a2777c 554 } else {
eea3341d 555 $errordoclink = get_docs_url();
34a2777c 556 }
eea3341d 557
34a2777c 558 if ($module === 'error') {
559 $modulelink = 'moodle';
0ae8f5fc 560 } else {
34a2777c 561 $modulelink = $module;
251387d0 562 }
eea3341d 563 $moreinfourl = $errordoclink . 'error/' . $modulelink . '/' . $errorcode;
34a2777c 564
d4a03c00 565 if (empty($link)) {
34a2777c 566 if (!empty($SESSION->fromurl)) {
567 $link = $SESSION->fromurl;
568 unset($SESSION->fromurl);
569 } else {
570 $link = $CFG->wwwroot .'/';
571 }
572 }
573
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PS
574 // when printing an error the continue button should never link offsite
575 if (stripos($link, $CFG->wwwroot) === false &&
576 stripos($link, $CFG->httpswwwroot) === false) {
577 $link = $CFG->wwwroot.'/';
578 }
579
365a5941 580 $info = new stdClass();
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PS
581 $info->message = $message;
582 $info->errorcode = $errorcode;
583 $info->backtrace = $backtrace;
584 $info->link = $link;
585 $info->moreinfourl = $moreinfourl;
586 $info->a = $a;
587 $info->debuginfo = $debuginfo;
30fa50d0 588
c19bc39c 589 return $info;
34a2777c 590}
591
eea3341d 592/**
32c842e2 593 * Returns the Moodle Docs URL in the users language for a given 'More help' link.
eea3341d 594 *
32c842e2
TH
595 * There are three cases:
596 *
597 * 1. In the normal case, $path will be a short relative path 'component/thing',
598 * like 'mod/folder/view' 'group/import'. This gets turned into an link to
599 * MoodleDocs in the user's language, and for the appropriate Moodle version.
600 * E.g. 'group/import' may become 'http://docs.moodle.org/2x/en/group/import'.
601 * The 'http://docs.moodle.org' bit comes from $CFG->docroot.
602 *
603 * This is the only option that should be used in standard Moodle code. The other
604 * two options have been implemented because they are useful for third-party plugins.
605 *
e2554394 606 * 2. $path may be an absolute URL, starting http:// or https://. In this case,
32c842e2
TH
607 * the link is used as is.
608 *
609 * 3. $path may start %%WWWROOT%%, in which case that is replaced by
610 * $CFG->wwwroot to make the link.
611 *
612 * @param string $path the place to link to. See above for details.
613 * @return string The MoodleDocs URL in the user's language. for example @link http://docs.moodle.org/2x/en/$path}
eea3341d 614 */
32c842e2 615function get_docs_url($path = null) {
eea3341d 616 global $CFG;
32c842e2
TH
617
618 // Absolute URLs are used unmodified.
619 if (substr($path, 0, 7) === 'http://' || substr($path, 0, 8) === 'https://') {
620 return $path;
621 }
622
623 // Paths starting %%WWWROOT%% have that replaced by $CFG->wwwroot.
624 if (substr($path, 0, 11) === '%%WWWROOT%%') {
625 return $CFG->wwwroot . substr($path, 11);
626 }
627
628 // Otherwise we do the normal case, and construct a MoodleDocs URL relative to $CFG->docroot.
629
ed01233a
AB
630 // Check that $CFG->branch has been set up, during installation it won't be.
631 if (empty($CFG->branch)) {
32c842e2 632 // It's not there yet so look at version.php.
eea3341d
AB
633 include($CFG->dirroot.'/version.php');
634 } else {
32c842e2 635 // We can use $CFG->branch and avoid having to include version.php.
ed01233a 636 $branch = $CFG->branch;
eea3341d 637 }
ed01233a
AB
638 // ensure branch is valid.
639 if (!$branch) {
eea3341d
AB
640 // We should never get here but in case we do lets set $branch to .
641 // the smart one's will know that this is the current directory
642 // and the smarter ones will know that there is some smart matching
643 // that will ensure people end up at the latest version of the docs.
644 $branch = '.';
645 }
646 if (!empty($CFG->docroot)) {
647 return $CFG->docroot . '/' . $branch . '/' . current_language() . '/' . $path;
648 } else {
32c842e2 649 return 'http://docs.moodle.org/'. $branch . '/' . current_language() . '/' . $path;
eea3341d
AB
650 }
651}
652
34a2777c 653/**
654 * Formats a backtrace ready for output.
655 *
656 * @param array $callers backtrace array, as returned by debug_backtrace().
657 * @param boolean $plaintext if false, generates HTML, if true generates plain text.
658 * @return string formatted backtrace, ready for output.
659 */
660function format_backtrace($callers, $plaintext = false) {
a0394be4 661 // do not use $CFG->dirroot because it might not be available in destructors
34a2777c 662 $dirroot = dirname(dirname(__FILE__));
30fa50d0 663
34a2777c 664 if (empty($callers)) {
665 return '';
666 }
667
668 $from = $plaintext ? '' : '<ul style="text-align: left">';
669 foreach ($callers as $caller) {
670 if (!isset($caller['line'])) {
671 $caller['line'] = '?'; // probably call_user_func()
672 }
673 if (!isset($caller['file'])) {
674 $caller['file'] = 'unknownfile'; // probably call_user_func()
675 }
676 $from .= $plaintext ? '* ' : '<li>';
677 $from .= 'line ' . $caller['line'] . ' of ' . str_replace($dirroot, '', $caller['file']);
678 if (isset($caller['function'])) {
679 $from .= ': call to ';
680 if (isset($caller['class'])) {
681 $from .= $caller['class'] . $caller['type'];
682 }
683 $from .= $caller['function'] . '()';
684 } else if (isset($caller['exception'])) {
685 $from .= ': '.$caller['exception'].' thrown';
686 }
687 $from .= $plaintext ? "\n" : '</li>';
688 }
689 $from .= $plaintext ? '' : '</ul>';
690
691 return $from;
251387d0 692}
6a525ce2 693
cbad562e
PS
694/**
695 * This function makes the return value of ini_get consistent if you are
696 * setting server directives through the .htaccess file in apache.
697 *
698 * Current behavior for value set from php.ini On = 1, Off = [blank]
699 * Current behavior for value set from .htaccess On = On, Off = Off
700 * Contributed by jdell @ unr.edu
701 *
702 * @param string $ini_get_arg The argument to get
703 * @return bool True for on false for not
704 */
705function ini_get_bool($ini_get_arg) {
706 $temp = ini_get($ini_get_arg);
707
708 if ($temp == '1' or strtolower($temp) == 'on') {
709 return true;
710 }
711 return false;
712}
713
fbf2c91e 714/**
715 * This function verifies the sanity of PHP configuration
716 * and stops execution if anything critical found.
717 */
718function setup_validate_php_configuration() {
719 // this must be very fast - no slow checks here!!!
720
721 if (ini_get_bool('register_globals')) {
722 print_error('globalswarning', 'admin');
723 }
724 if (ini_get_bool('session.auto_start')) {
725 print_error('sessionautostartwarning', 'admin');
726 }
727 if (ini_get_bool('magic_quotes_runtime')) {
728 print_error('fatalmagicquotesruntime', 'admin');
729 }
730}
731
12bb0c3e
PS
732/**
733 * Initialise global $CFG variable
734 * @return void
735 */
736function initialise_cfg() {
737 global $CFG, $DB;
8b8aa060 738
12bb0c3e
PS
739 try {
740 if ($DB) {
007bfe8b
SH
741 $localcfg = get_config('core');
742 foreach ($localcfg as $name => $value) {
12bb0c3e
PS
743 if (property_exists($CFG, $name)) {
744 // config.php settings always take precedence
745 continue;
746 }
747 $CFG->{$name} = $value;
748 }
749 }
69ac5d47 750 } catch (dml_exception $e) {
12bb0c3e
PS
751 // most probably empty db, going to install soon
752 }
753}
754
11e7b506 755/**
75781f87 756 * Initialises $FULLME and friends. Private function. Should only be called from
757 * setup.php.
11e7b506 758 */
759function initialise_fullme() {
f0f8f9a7 760 global $CFG, $FULLME, $ME, $SCRIPT, $FULLSCRIPT;
11e7b506 761
75781f87 762 // Detect common config error.
84b88cfd 763 if (substr($CFG->wwwroot, -1) == '/') {
764 print_error('wwwrootslash', 'error');
765 }
766
75781f87 767 if (CLI_SCRIPT) {
768 initialise_fullme_cli();
769 return;
37ccf1fe 770 }
11e7b506 771
75781f87 772 $rurl = setup_get_remote_url();
f0f8f9a7
PS
773 $wwwroot = parse_url($CFG->wwwroot.'/');
774
775 if (empty($rurl['host'])) {
776 // missing host in request header, probably not a real browser, let's ignore them
777
778 } else if (!empty($CFG->reverseproxy)) {
779 // $CFG->reverseproxy specifies if reverse proxy server used
780 // Used in load balancing scenarios.
781 // Do not abuse this to try to solve lan/wan access problems!!!!!
782
783 } else {
784 if (($rurl['host'] !== $wwwroot['host']) or (!empty($wwwroot['port']) and $rurl['port'] != $wwwroot['port'])) {
785 // Explain the problem and redirect them to the right URL
786 if (!defined('NO_MOODLE_COOKIES')) {
787 define('NO_MOODLE_COOKIES', true);
788 }
e9e567f3 789 // The login/token.php script should call the correct url/port.
31d5b2dd 790 if (defined('REQUIRE_CORRECT_ACCESS') && REQUIRE_CORRECT_ACCESS) {
e9e567f3
JM
791 $wwwrootport = empty($wwwroot['port'])?'':$wwwroot['port'];
792 $calledurl = $rurl['host'];
793 if (!empty($rurl['port'])) {
794 $calledurl .= ':'. $rurl['port'];
795 }
796 $correcturl = $wwwroot['host'];
797 if (!empty($wwwrootport)) {
798 $correcturl .= ':'. $wwwrootport;
799 }
800 throw new moodle_exception('requirecorrectaccess', 'error', '', null,
801 'You called ' . $calledurl .', you should have called ' . $correcturl);
802 }
f0f8f9a7
PS
803 redirect($CFG->wwwroot, get_string('wwwrootmismatch', 'error', $CFG->wwwroot), 3);
804 }
805 }
11e7b506 806
75781f87 807 // Check that URL is under $CFG->wwwroot.
808 if (strpos($rurl['path'], $wwwroot['path']) === 0) {
809 $SCRIPT = substr($rurl['path'], strlen($wwwroot['path'])-1);
810 } else {
811 // Probably some weird external script
812 $SCRIPT = $FULLSCRIPT = $FULLME = $ME = null;
11e7b506 813 return;
814 }
815
75781f87 816 // $CFG->sslproxy specifies if external SSL appliance is used
817 // (That is, the Moodle server uses http, with an external box translating everything to https).
818 if (empty($CFG->sslproxy)) {
56048f83 819 if ($rurl['scheme'] === 'http' and $wwwroot['scheme'] === 'https') {
75781f87 820 print_error('sslonlyaccess', 'error');
821 }
56048f83
PS
822 } else {
823 if ($wwwroot['scheme'] !== 'https') {
824 throw new coding_exception('Must use https address in wwwroot when ssl proxy enabled!');
825 }
74162134 826 $rurl['scheme'] = 'https'; // make moodle believe it runs on https, squid or something else it doing it
75781f87 827 }
828
75781f87 829 // hopefully this will stop all those "clever" admins trying to set up moodle
830 // with two different addresses in intranet and Internet
e0f2718f 831 if (!empty($CFG->reverseproxy) && $rurl['host'] === $wwwroot['host']) {
75781f87 832 print_error('reverseproxyabused', 'error');
833 }
834
835 $hostandport = $rurl['scheme'] . '://' . $wwwroot['host'];
836 if (!empty($wwwroot['port'])) {
837 $hostandport .= ':'.$wwwroot['port'];
838 }
839
840 $FULLSCRIPT = $hostandport . $rurl['path'];
841 $FULLME = $hostandport . $rurl['fullpath'];
842 $ME = $rurl['fullpath'];
75781f87 843}
844
845/**
846 * Initialises $FULLME and friends for command line scripts.
847 * This is a private method for use by initialise_fullme.
848 */
849function initialise_fullme_cli() {
80e30f25 850 global $CFG, $FULLME, $ME, $SCRIPT, $FULLSCRIPT;
851
75781f87 852 // Urls do not make much sense in CLI scripts
853 $backtrace = debug_backtrace();
854 $topfile = array_pop($backtrace);
855 $topfile = realpath($topfile['file']);
856 $dirroot = realpath($CFG->dirroot);
857
858 if (strpos($topfile, $dirroot) !== 0) {
859 // Probably some weird external script
860 $SCRIPT = $FULLSCRIPT = $FULLME = $ME = null;
861 } else {
862 $relativefile = substr($topfile, strlen($dirroot));
863 $relativefile = str_replace('\\', '/', $relativefile); // Win fix
864 $SCRIPT = $FULLSCRIPT = $relativefile;
865 $FULLME = $ME = null;
866 }
867}
868
869/**
870 * Get the URL that PHP/the web server thinks it is serving. Private function
871 * used by initialise_fullme. In your code, use $PAGE->url, $SCRIPT, etc.
872 * @return array in the same format that parse_url returns, with the addition of
873 * a 'fullpath' element, which includes any slasharguments path.
874 */
875function setup_get_remote_url() {
11e7b506 876 $rurl = array();
e0f2718f
PS
877 if (isset($_SERVER['HTTP_HOST'])) {
878 list($rurl['host']) = explode(':', $_SERVER['HTTP_HOST']);
879 } else {
880 $rurl['host'] = null;
881 }
11e7b506 882 $rurl['port'] = $_SERVER['SERVER_PORT'];
75781f87 883 $rurl['path'] = $_SERVER['SCRIPT_NAME']; // Script path without slash arguments
2a9c0d05 884 $rurl['scheme'] = (empty($_SERVER['HTTPS']) or $_SERVER['HTTPS'] === 'off' or $_SERVER['HTTPS'] === 'Off' or $_SERVER['HTTPS'] === 'OFF') ? 'http' : 'https';
11e7b506 885
886 if (stripos($_SERVER['SERVER_SOFTWARE'], 'apache') !== false) {
887 //Apache server
f49b359b 888 $rurl['fullpath'] = $_SERVER['REQUEST_URI'];
7e13a265 889
11e7b506 890 } else if (stripos($_SERVER['SERVER_SOFTWARE'], 'iis') !== false) {
199c1981 891 //IIS - needs a lot of tweaking to make it work
11e7b506 892 $rurl['fullpath'] = $_SERVER['SCRIPT_NAME'];
893
894 // NOTE: ignore PATH_INFO because it is incorrectly encoded using 8bit filesystem legacy encoding in IIS
895 // since 2.0 we rely on iis rewrite extenssion like Helicon ISAPI_rewrite
21517960 896 // example rule: RewriteRule ^([^\?]+?\.php)(\/.+)$ $1\?file=$2 [QSA]
11e7b506 897
898 if ($_SERVER['QUERY_STRING'] != '') {
991ec2ee 899 $rurl['fullpath'] .= '?'.$_SERVER['QUERY_STRING'];
11e7b506 900 }
901 $_SERVER['REQUEST_URI'] = $rurl['fullpath']; // extra IIS compatibility
902
f49b359b
PS
903/* NOTE: following servers are not fully tested! */
904
905 } else if (stripos($_SERVER['SERVER_SOFTWARE'], 'lighttpd') !== false) {
906 //lighttpd - not officially supported
f49b359b
PS
907 $rurl['fullpath'] = $_SERVER['REQUEST_URI']; // TODO: verify this is always properly encoded
908
909 } else if (stripos($_SERVER['SERVER_SOFTWARE'], 'nginx') !== false) {
910 //nginx - not officially supported
28ec73dc
PS
911 if (!isset($_SERVER['SCRIPT_NAME'])) {
912 die('Invalid server configuration detected, please try to add "fastcgi_param SCRIPT_NAME $fastcgi_script_name;" to the nginx server configuration.');
913 }
f49b359b
PS
914 $rurl['fullpath'] = $_SERVER['REQUEST_URI']; // TODO: verify this is always properly encoded
915
199c1981
PS
916 } else if (stripos($_SERVER['SERVER_SOFTWARE'], 'cherokee') !== false) {
917 //cherokee - not officially supported
199c1981
PS
918 $rurl['fullpath'] = $_SERVER['REQUEST_URI']; // TODO: verify this is always properly encoded
919
8b8aa060
PS
920 } else if (stripos($_SERVER['SERVER_SOFTWARE'], 'zeus') !== false) {
921 //zeus - not officially supported
8b8aa060
PS
922 $rurl['fullpath'] = $_SERVER['REQUEST_URI']; // TODO: verify this is always properly encoded
923
f49b359b
PS
924 } else if (stripos($_SERVER['SERVER_SOFTWARE'], 'LiteSpeed') !== false) {
925 //LiteSpeed - not officially supported
f49b359b
PS
926 $rurl['fullpath'] = $_SERVER['REQUEST_URI']; // TODO: verify this is always properly encoded
927
4e3e8464
PS
928 } else if ($_SERVER['SERVER_SOFTWARE'] === 'HTTPD') {
929 //obscure name found on some servers - this is definitely not supported
930 $rurl['fullpath'] = $_SERVER['REQUEST_URI']; // TODO: verify this is always properly encoded
931
d860f1ad
PS
932 } else if (strpos($_SERVER['SERVER_SOFTWARE'], 'PHP') === 0) {
933 // built-in PHP Development Server
934 $rurl['fullpath'] = $_SERVER['REQUEST_URI'];
935
936 } else {
75781f87 937 throw new moodle_exception('unsupportedwebserver', 'error', '', $_SERVER['SERVER_SOFTWARE']);
11e7b506 938 }
0ae36f66
PS
939
940 // sanitize the url a bit more, the encoding style may be different in vars above
941 $rurl['fullpath'] = str_replace('"', '%22', $rurl['fullpath']);
942 $rurl['fullpath'] = str_replace('\'', '%27', $rurl['fullpath']);
943
75781f87 944 return $rurl;
11e7b506 945}
946
d3f9f1f8 947/**
948 * Initializes our performance info early.
949 *
950 * Pairs up with get_performance_info() which is actually
251387d0 951 * in moodlelib.php. This function is here so that we can
952 * call it before all the libs are pulled in.
d3f9f1f8 953 *
954 * @uses $PERF
955 */
956function init_performance_info() {
957
6fc4ad72 958 global $PERF, $CFG, $USER;
251387d0 959
365a5941 960 $PERF = new stdClass();
d3f9f1f8 961 $PERF->logwrites = 0;
962 if (function_exists('microtime')) {
963 $PERF->starttime = microtime();
c84a2dbe 964 }
d3f9f1f8 965 if (function_exists('memory_get_usage')) {
966 $PERF->startmemory = memory_get_usage();
967 }
968 if (function_exists('posix_times')) {
251387d0 969 $PERF->startposixtimes = posix_times();
d3f9f1f8 970 }
971}
972
31a99877 973/**
974 * Indicates whether we are in the middle of the initial Moodle install.
975 *
976 * Very occasionally it is necessary avoid running certain bits of code before the
977 * Moodle installation has completed. The installed flag is set in admin/index.php
978 * after Moodle core and all the plugins have been installed, but just before
979 * the person doing the initial install is asked to choose the admin password.
980 *
981 * @return boolean true if the initial install is not complete.
982 */
983function during_initial_install() {
984 global $CFG;
985 return empty($CFG->rolesactive);
986}
987
76f3815b 988/**
989 * Function to raise the memory limit to a new value.
990 * Will respect the memory limit if it is higher, thus allowing
991 * settings in php.ini, apache conf or command line switches
0f0f0768 992 * to override it.
76f3815b 993 *
0f0f0768
PS
994 * The memory limit should be expressed with a constant
995 * MEMORY_STANDARD, MEMORY_EXTRA or MEMORY_HUGE.
996 * It is possible to use strings or integers too (eg:'128M').
76f3815b 997 *
0f0f0768
PS
998 * @param mixed $newlimit the new memory limit
999 * @return bool success
76f3815b 1000 */
11e7b506 1001function raise_memory_limit($newlimit) {
0f0f0768 1002 global $CFG;
76f3815b 1003
0f0f0768
PS
1004 if ($newlimit == MEMORY_UNLIMITED) {
1005 ini_set('memory_limit', -1);
1006 return true;
1007
1008 } else if ($newlimit == MEMORY_STANDARD) {
cd3059b1
PS
1009 if (PHP_INT_SIZE > 4) {
1010 $newlimit = get_real_size('128M'); // 64bit needs more memory
1011 } else {
1012 $newlimit = get_real_size('96M');
1013 }
0f0f0768
PS
1014
1015 } else if ($newlimit == MEMORY_EXTRA) {
cd3059b1
PS
1016 if (PHP_INT_SIZE > 4) {
1017 $newlimit = get_real_size('384M'); // 64bit needs more memory
1018 } else {
1019 $newlimit = get_real_size('256M');
1020 }
d827f7b8 1021 if (!empty($CFG->extramemorylimit)) {
0f0f0768
PS
1022 $extra = get_real_size($CFG->extramemorylimit);
1023 if ($extra > $newlimit) {
1024 $newlimit = $extra;
1025 }
1026 }
1027
1028 } else if ($newlimit == MEMORY_HUGE) {
1029 $newlimit = get_real_size('2G');
1030
1031 } else {
1032 $newlimit = get_real_size($newlimit);
1033 }
1034
1035 if ($newlimit <= 0) {
1036 debugging('Invalid memory limit specified.');
76f3815b 1037 return false;
1038 }
1039
cbad562e 1040 $cur = ini_get('memory_limit');
76f3815b 1041 if (empty($cur)) {
1042 // if php is compiled without --enable-memory-limits
1043 // apparently memory_limit is set to ''
0f0f0768 1044 $cur = 0;
76f3815b 1045 } else {
1046 if ($cur == -1){
1047 return true; // unlimited mem!
1048 }
0f0f0768 1049 $cur = get_real_size($cur);
76f3815b 1050 }
1051
0f0f0768 1052 if ($newlimit > $cur) {
76f3815b 1053 ini_set('memory_limit', $newlimit);
7022dd39 1054 return true;
1055 }
1056 return false;
1057}
1058
1059/**
1060 * Function to reduce the memory limit to a new value.
1061 * Will respect the memory limit if it is lower, thus allowing
1062 * settings in php.ini, apache conf or command line switches
1063 * to override it
1064 *
1065 * The memory limit should be expressed with a string (eg:'64M')
1066 *
1067 * @param string $newlimit the new memory limit
1068 * @return bool
1069 */
f630a546 1070function reduce_memory_limit($newlimit) {
7022dd39 1071 if (empty($newlimit)) {
1072 return false;
1073 }
cbad562e 1074 $cur = ini_get('memory_limit');
7022dd39 1075 if (empty($cur)) {
1076 // if php is compiled without --enable-memory-limits
1077 // apparently memory_limit is set to ''
0f0f0768 1078 $cur = 0;
7022dd39 1079 } else {
1080 if ($cur == -1){
1081 return true; // unlimited mem!
1082 }
1083 $cur = get_real_size($cur);
1084 }
1085
1086 $new = get_real_size($newlimit);
1087 // -1 is smaller, but it means unlimited
1088 if ($new < $cur && $new != -1) {
1089 ini_set('memory_limit', $newlimit);
76f3815b 1090 return true;
1091 }
1092 return false;
1093}
1094
1095/**
1096 * Converts numbers like 10M into bytes.
1097 *
0f0f0768
PS
1098 * @param string $size The size to be converted
1099 * @return int
76f3815b 1100 */
0f0f0768 1101function get_real_size($size = 0) {
76f3815b 1102 if (!$size) {
1103 return 0;
1104 }
11e7b506 1105 $scan = array();
0f0f0768
PS
1106 $scan['GB'] = 1073741824;
1107 $scan['Gb'] = 1073741824;
1108 $scan['G'] = 1073741824;
76f3815b 1109 $scan['MB'] = 1048576;
1110 $scan['Mb'] = 1048576;
1111 $scan['M'] = 1048576;
1112 $scan['m'] = 1048576;
1113 $scan['KB'] = 1024;
1114 $scan['Kb'] = 1024;
1115 $scan['K'] = 1024;
1116 $scan['k'] = 1024;
1117
1118 while (list($key) = each($scan)) {
1119 if ((strlen($size)>strlen($key))&&(substr($size, strlen($size) - strlen($key))==$key)) {
1120 $size = substr($size, 0, strlen($size) - strlen($key)) * $scan[$key];
1121 break;
1122 }
1123 }
1124 return $size;
1125}
1126
cbad562e 1127/**
871ed458
PS
1128 * Try to disable all output buffering and purge
1129 * all headers.
1130 *
34223e03 1131 * @access private to be called only from lib/setup.php !
cbad562e
PS
1132 * @return void
1133 */
1134function disable_output_buffering() {
1135 $olddebug = error_reporting(0);
1136
1137 // disable compression, it would prevent closing of buffers
1138 if (ini_get_bool('zlib.output_compression')) {
1139 ini_set('zlib.output_compression', 'Off');
1140 }
1141
1142 // try to flush everything all the time
1143 ob_implicit_flush(true);
1144
1145 // close all buffers if possible and discard any existing output
1146 // this can actually work around some whitespace problems in config.php
1147 while(ob_get_level()) {
1148 if (!ob_end_clean()) {
1149 // prevent infinite loop when buffer can not be closed
1150 break;
1151 }
1152 }
1153
99302c5e
PS
1154 // disable any other output handlers
1155 ini_set('output_handler', '');
1156
cbad562e
PS
1157 error_reporting($olddebug);
1158}
1159
5e39d7aa 1160/**
1161 * Check whether a major upgrade is needed. That is defined as an upgrade that
1162 * changes something really fundamental in the database, so nothing can possibly
1163 * work until the database has been updated, and that is defined by the hard-coded
1164 * version number in this function.
1165 */
1166function redirect_if_major_upgrade_required() {
1167 global $CFG;
e7054f06 1168 $lastmajordbchanges = 2013022500.01;
1e7db9fe 1169 if (empty($CFG->version) or (float)$CFG->version < $lastmajordbchanges or
5e39d7aa 1170 during_initial_install() or !empty($CFG->adminsetuppending)) {
1171 try {
1172 @session_get_instance()->terminate_current();
1173 } catch (Exception $e) {
1174 // Ignore any errors, redirect to upgrade anyway.
1175 }
a38c7a10 1176 $url = $CFG->wwwroot . '/' . $CFG->admin . '/index.php';
5e39d7aa 1177 @header($_SERVER['SERVER_PROTOCOL'] . ' 303 See Other');
a38c7a10
PS
1178 @header('Location: ' . $url);
1179 echo bootstrap_renderer::plain_redirect_message(htmlspecialchars($url));
5e39d7aa 1180 exit;
1181 }
1182}
1183
d3f9f1f8 1184/**
4031f6a2
PS
1185 * Function to check if a directory exists and by default create it if not exists.
1186 *
1187 * Previously this was accepting paths only from dataroot, but we now allow
1188 * files outside of dataroot if you supply custom paths for some settings in config.php.
1189 * This function does not verify that the directory is writable.
d3f9f1f8 1190 *
0b9f2a02
PS
1191 * NOTE: this function uses current file stat cache,
1192 * please use clearstatcache() before this if you expect that the
1193 * directories may have been removed recently from a different request.
1194 *
4031f6a2
PS
1195 * @param string $dir absolute directory path
1196 * @param boolean $create directory if does not exist
1197 * @param boolean $recursive create directory recursively
1198 * @return boolean true if directory exists or created, false otherwise
d3f9f1f8 1199 */
4031f6a2 1200function check_dir_exists($dir, $create = true, $recursive = true) {
d3f9f1f8 1201 global $CFG;
1202
4031f6a2 1203 umask(0000); // just in case some evil code changed it
d3f9f1f8 1204
4031f6a2
PS
1205 if (is_dir($dir)) {
1206 return true;
1207 }
d3f9f1f8 1208
4031f6a2
PS
1209 if (!$create) {
1210 return false;
d100b8a0 1211 }
1212
4031f6a2
PS
1213 return mkdir($dir, $CFG->directorypermissions, $recursive);
1214}
1215
1216/**
e6958907 1217 * Create a directory and make sure it is writable.
4031f6a2 1218 *
32db0f0d 1219 * @private
e6958907 1220 * @param string $dir the full path of the directory to be created
4031f6a2
PS
1221 * @param bool $exceptiononerror throw exception if error encountered
1222 * @return string|false Returns full path to directory if successful, false if not; may throw exception
1223 */
e6958907 1224function make_writable_directory($dir, $exceptiononerror = true) {
4031f6a2
PS
1225 global $CFG;
1226
4031f6a2
PS
1227 if (file_exists($dir) and !is_dir($dir)) {
1228 if ($exceptiononerror) {
1229 throw new coding_exception($dir.' directory can not be created, file with the same name already exists.');
1230 } else {
1231 return false;
1232 }
1233 }
1234
1235 umask(0000); // just in case some evil code changed it
1236
1237 if (!file_exists($dir)) {
1238 if (!mkdir($dir, $CFG->directorypermissions, true)) {
1239 if ($exceptiononerror) {
1240 throw new invalid_dataroot_permissions($dir.' can not be created, check permissions.');
1241 } else {
d3f9f1f8 1242 return false;
1243 }
d3f9f1f8 1244 }
1245 }
1246
4031f6a2
PS
1247 if (!is_writable($dir)) {
1248 if ($exceptiononerror) {
1249 throw new invalid_dataroot_permissions($dir.' is not writable, check permissions.');
1250 } else {
1251 return false;
1252 }
1253 }
1254
1255 return $dir;
d3f9f1f8 1256}
1257
e6958907
TL
1258/**
1259 * Protect a directory from web access.
1260 * Could be extended in the future to support other mechanisms (e.g. other webservers).
1261 *
32db0f0d 1262 * @private
e6958907
TL
1263 * @param string $dir the full path of the directory to be protected
1264 */
1265function protect_directory($dir) {
1266 // Make sure a .htaccess file is here, JUST IN CASE the files area is in the open and .htaccess is supported
1267 if (!file_exists("$dir/.htaccess")) {
1268 if ($handle = fopen("$dir/.htaccess", 'w')) { // For safety
1269 @fwrite($handle, "deny from all\r\nAllowOverride None\r\nNote: this file is broken intentionally, we do not want anybody to undo it in subdirectory!\r\n");
1270 @fclose($handle);
1271 }
1272 }
1273}
1274
1275/**
1276 * Create a directory under dataroot and make sure it is writable.
32db0f0d 1277 * Do not use for temporary and cache files - see make_temp_directory() and make_cache_directory().
e6958907
TL
1278 *
1279 * @param string $directory the full path of the directory to be created under $CFG->dataroot
1280 * @param bool $exceptiononerror throw exception if error encountered
1281 * @return string|false Returns full path to directory if successful, false if not; may throw exception
1282 */
1283function make_upload_directory($directory, $exceptiononerror = true) {
1284 global $CFG;
32db0f0d
PS
1285
1286 if (strpos($directory, 'temp/') === 0 or $directory === 'temp') {
1287 debugging('Use make_temp_directory() for creation of temporary directory and $CFG->tempdir to get the location.');
1288
1289 } else if (strpos($directory, 'cache/') === 0 or $directory === 'cache') {
1290 debugging('Use make_cache_directory() for creation of chache directory and $CFG->cachedir to get the location.');
1291 }
1292
e6958907
TL
1293 protect_directory($CFG->dataroot);
1294 return make_writable_directory("$CFG->dataroot/$directory", $exceptiononerror);
1295}
1296
1297/**
1298 * Create a directory under tempdir and make sure it is writable.
32db0f0d 1299 * Temporary files should be used during the current request only!
e6958907
TL
1300 *
1301 * @param string $directory the full path of the directory to be created under $CFG->tempdir
1302 * @param bool $exceptiononerror throw exception if error encountered
1303 * @return string|false Returns full path to directory if successful, false if not; may throw exception
1304 */
1305function make_temp_directory($directory, $exceptiononerror = true) {
1306 global $CFG;
adf0fc0e
PS
1307 if ($CFG->tempdir !== "$CFG->dataroot/temp") {
1308 check_dir_exists($CFG->tempdir, true, true);
1309 protect_directory($CFG->tempdir);
7a7edd21
PS
1310 } else {
1311 protect_directory($CFG->dataroot);
adf0fc0e 1312 }
e6958907
TL
1313 return make_writable_directory("$CFG->tempdir/$directory", $exceptiononerror);
1314}
1315
1316/**
1317 * Create a directory under cachedir and make sure it is writable.
1318 *
1319 * @param string $directory the full path of the directory to be created under $CFG->cachedir
1320 * @param bool $exceptiononerror throw exception if error encountered
1321 * @return string|false Returns full path to directory if successful, false if not; may throw exception
1322 */
1323function make_cache_directory($directory, $exceptiononerror = true) {
1324 global $CFG;
adf0fc0e
PS
1325 if ($CFG->cachedir !== "$CFG->dataroot/cache") {
1326 check_dir_exists($CFG->cachedir, true, true);
1327 protect_directory($CFG->cachedir);
7a7edd21
PS
1328 } else {
1329 protect_directory($CFG->dataroot);
adf0fc0e 1330 }
e6958907
TL
1331 return make_writable_directory("$CFG->cachedir/$directory", $exceptiononerror);
1332}
1333
81b58cc2
PS
1334/**
1335 * Checks if current user is a web crawler.
1336 *
1337 * This list can not be made complete, this is not a security
1338 * restriction, we make the list only to help these sites
1339 * especially when automatic guest login is disabled.
1340 *
1341 * If admin needs security they should enable forcelogin
1342 * and disable guest access!!
1343 *
1344 * @return bool
1345 */
1346function is_web_crawler() {
1347 if (!empty($_SERVER['HTTP_USER_AGENT'])) {
1348 if (strpos($_SERVER['HTTP_USER_AGENT'], 'Googlebot') !== false ) {
1349 return true;
1350 } else if (strpos($_SERVER['HTTP_USER_AGENT'], 'google.com') !== false ) { // Google
1351 return true;
1352 } else if (strpos($_SERVER['HTTP_USER_AGENT'], 'Yahoo! Slurp') !== false ) { // Yahoo
1353 return true;
1354 } else if (strpos($_SERVER['HTTP_USER_AGENT'], '[ZSEBOT]') !== false ) { // Zoomspider
1355 return true;
f28af1dd
PS
1356 } else if (stripos($_SERVER['HTTP_USER_AGENT'], 'msnbot') !== false ) { // MSN Search
1357 return true;
1358 } else if (strpos($_SERVER['HTTP_USER_AGENT'], 'bingbot') !== false ) { // Bing
81b58cc2
PS
1359 return true;
1360 } else if (strpos($_SERVER['HTTP_USER_AGENT'], 'Yandex') !== false ) {
1361 return true;
1362 } else if (strpos($_SERVER['HTTP_USER_AGENT'], 'AltaVista') !== false ) {
1363 return true;
f28af1dd
PS
1364 } else if (stripos($_SERVER['HTTP_USER_AGENT'], 'baiduspider') !== false ) { // Baidu
1365 return true;
1366 } else if (strpos($_SERVER['HTTP_USER_AGENT'], 'Teoma') !== false ) { // Ask.com
1367 return true;
81b58cc2
PS
1368 }
1369 }
1370 return false;
1371}
2142d492 1372
c84a2dbe 1373/**
1374 * This class solves the problem of how to initialise $OUTPUT.
1375 *
1376 * The problem is caused be two factors
1377 * <ol>
1378 * <li>On the one hand, we cannot be sure when output will start. In particular,
30fa50d0 1379 * an error, which needs to be displayed, could be thrown at any time.</li>
c84a2dbe 1380 * <li>On the other hand, we cannot be sure when we will have all the information
1381 * necessary to correctly initialise $OUTPUT. $OUTPUT depends on the theme, which
1382 * (potentially) depends on the current course, course categories, and logged in user.
1383 * It also depends on whether the current page requires HTTPS.</li>
1384 * </ol>
1385 *
1386 * So, it is hard to find a single natural place during Moodle script execution,
1387 * which we can guarantee is the right time to initialise $OUTPUT. Instead we
1388 * adopt the following strategy
1389 * <ol>
1390 * <li>We will initialise $OUTPUT the first time it is used.</li>
1391 * <li>If, after $OUTPUT has been initialised, the script tries to change something
7e0d6675 1392 * that $OUTPUT depends on, we throw an exception making it clear that the script
c84a2dbe 1393 * did something wrong.
1394 * </ol>
1395 *
1396 * The only problem with that is, how do we initialise $OUTPUT on first use if,
1397 * it is going to be used like $OUTPUT->somthing(...)? Well that is where this
1398 * class comes in. Initially, we set up $OUTPUT = new bootstrap_renderer(). Then,
1399 * when any method is called on that object, we initialise $OUTPUT, and pass the call on.
1400 *
1401 * Note that this class is used before lib/outputlib.php has been loaded, so we
1387fcdd 1402 * must be careful referring to classes/functions from there, they may not be
c84a2dbe 1403 * defined yet, and we must avoid fatal errors.
1404 *
1405 * @copyright 2009 Tim Hunt
1406 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1407 * @since Moodle 2.0
1408 */
1409class bootstrap_renderer {
1410 /**
1411 * Handles re-entrancy. Without this, errors or debugging output that occur
1412 * during the initialisation of $OUTPUT, cause infinite recursion.
1413 * @var boolean
1414 */
1415 protected $initialising = false;
1416
b7009474 1417 /**
1418 * Have we started output yet?
1419 * @return boolean true if the header has been printed.
1420 */
1421 public function has_started() {
1422 return false;
1423 }
1424
41701ffd
PS
1425 /**
1426 * Constructor - to be used by core code only.
34223e03
SH
1427 * @param string $method The method to call
1428 * @param array $arguments Arguments to pass to the method being called
41701ffd
PS
1429 * @return string
1430 */
c84a2dbe 1431 public function __call($method, $arguments) {
b7009474 1432 global $OUTPUT, $PAGE;
c84a2dbe 1433
87b6851c 1434 $recursing = false;
1435 if ($method == 'notification') {
1387fcdd 1436 // Catch infinite recursion caused by debugging output during print_header.
87b6851c 1437 $backtrace = debug_backtrace();
1438 array_shift($backtrace);
1439 array_shift($backtrace);
50764d37 1440 $recursing = is_early_init($backtrace);
87b6851c 1441 }
1442
eb5bdb35
PS
1443 $earlymethods = array(
1444 'fatal_error' => 'early_error',
1445 'notification' => 'early_notification',
1446 );
1447
c84a2dbe 1448 // If lib/outputlib.php has been loaded, call it.
87b6851c 1449 if (!empty($PAGE) && !$recursing) {
eb5bdb35
PS
1450 if (array_key_exists($method, $earlymethods)) {
1451 //prevent PAGE->context warnings - exceptions might appear before we set any context
1452 $PAGE->set_context(null);
1453 }
b7009474 1454 $PAGE->initialise_theme_and_output();
1455 return call_user_func_array(array($OUTPUT, $method), $arguments);
c84a2dbe 1456 }
2142d492 1457
c84a2dbe 1458 $this->initialising = true;
eb5bdb35 1459
c84a2dbe 1460 // Too soon to initialise $OUTPUT, provide a couple of key methods.
c84a2dbe 1461 if (array_key_exists($method, $earlymethods)) {
1462 return call_user_func_array(array('bootstrap_renderer', $earlymethods[$method]), $arguments);
1463 }
1464
1465 throw new coding_exception('Attempt to start output before enough information is known to initialise the theme.');
1466 }
1467
1468 /**
1387fcdd 1469 * Returns nicely formatted error message in a div box.
f0f8f9a7
PS
1470 * @static
1471 * @param string $message error message
41701ffd
PS
1472 * @param string $moreinfourl (ignored in early errors)
1473 * @param string $link (ignored in early errors)
f0f8f9a7
PS
1474 * @param array $backtrace
1475 * @param string $debuginfo
30fa50d0 1476 * @return string
c84a2dbe 1477 */
3c1ea58b 1478 public static function early_error_content($message, $moreinfourl, $link, $backtrace, $debuginfo = null) {
b7009474 1479 global $CFG;
1480
3c1ea58b
PS
1481 $content = '<div style="margin-top: 6em; margin-left:auto; margin-right:auto; color:#990000; text-align:center; font-size:large; border-width:1px;
1482border-color:black; background-color:#ffffee; border-style:solid; border-radius: 20px; border-collapse: collapse;
1483width: 80%; -moz-border-radius: 20px; padding: 15px">
1484' . $message . '
1485</div>';
7383a7e2
SH
1486 // Check whether debug is set.
1487 $debug = (!empty($CFG->debug) && $CFG->debug >= DEBUG_DEVELOPER);
1488 // Also check we have it set in the config file. This occurs if the method to read the config table from the
1489 // database fails, reading from the config table is the first database interaction we have.
1490 $debug = $debug || (!empty($CFG->config_php_settings['debug']) && $CFG->config_php_settings['debug'] >= DEBUG_DEVELOPER );
1491 if ($debug) {
3c1ea58b 1492 if (!empty($debuginfo)) {
c5d18164
PS
1493 $debuginfo = s($debuginfo); // removes all nasty JS
1494 $debuginfo = str_replace("\n", '<br />', $debuginfo); // keep newlines
1495 $content .= '<div class="notifytiny">Debug info: ' . $debuginfo . '</div>';
3c1ea58b
PS
1496 }
1497 if (!empty($backtrace)) {
1498 $content .= '<div class="notifytiny">Stack trace: ' . format_backtrace($backtrace, false) . '</div>';
1499 }
1500 }
1501
1502 return $content;
1503 }
1504
1505 /**
1506 * This function should only be called by this class, or from exception handlers
f0f8f9a7
PS
1507 * @static
1508 * @param string $message error message
41701ffd
PS
1509 * @param string $moreinfourl (ignored in early errors)
1510 * @param string $link (ignored in early errors)
f0f8f9a7 1511 * @param array $backtrace
41701ffd 1512 * @param string $debuginfo extra information for developers
3c1ea58b
PS
1513 * @return string
1514 */
e9e567f3 1515 public static function early_error($message, $moreinfourl, $link, $backtrace, $debuginfo = null, $errorcode = null) {
1adaa404
PS
1516 global $CFG;
1517
1518 if (CLI_SCRIPT) {
1519 echo "!!! $message !!!\n";
1520 if (!empty($CFG->debug) and $CFG->debug >= DEBUG_DEVELOPER) {
1521 if (!empty($debuginfo)) {
1522 echo "\nDebug info: $debuginfo";
1523 }
1524 if (!empty($backtrace)) {
1525 echo "\nStack trace: " . format_backtrace($backtrace, true);
1526 }
1527 }
1528 return;
1529
1530 } else if (AJAX_SCRIPT) {
1531 $e = new stdClass();
1532 $e->error = $message;
1533 $e->stacktrace = NULL;
1534 $e->debuginfo = NULL;
1535 if (!empty($CFG->debug) and $CFG->debug >= DEBUG_DEVELOPER) {
1536 if (!empty($debuginfo)) {
1537 $e->debuginfo = $debuginfo;
1538 }
1539 if (!empty($backtrace)) {
1540 $e->stacktrace = format_backtrace($backtrace, true);
1541 }
1542 }
e9e567f3 1543 $e->errorcode = $errorcode;
8a7703ce 1544 @header('Content-Type: application/json; charset=utf-8');
1adaa404
PS
1545 echo json_encode($e);
1546 return;
1547 }
1548
c84a2dbe 1549 // In the name of protocol correctness, monitoring and performance
1387fcdd 1550 // profiling, set the appropriate error headers for machine consumption
c84a2dbe 1551 if (isset($_SERVER['SERVER_PROTOCOL'])) {
1552 // Avoid it with cron.php. Note that we assume it's HTTP/1.x
1387fcdd 1553 // The 503 ode here means our Moodle does not work at all, the error happened too early
c84a2dbe 1554 @header($_SERVER['SERVER_PROTOCOL'] . ' 503 Service Unavailable');
1555 }
1556
1557 // better disable any caching
1558 @header('Content-Type: text/html; charset=utf-8');
398862b9 1559 @header('X-UA-Compatible: IE=edge');
c84a2dbe 1560 @header('Cache-Control: no-store, no-cache, must-revalidate');
1561 @header('Cache-Control: post-check=0, pre-check=0', false);
1562 @header('Pragma: no-cache');
1563 @header('Expires: Mon, 20 Aug 1969 09:23:00 GMT');
1564 @header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
1565
5e39d7aa 1566 if (function_exists('get_string')) {
c84a2dbe 1567 $strerror = get_string('error');
1568 } else {
c84a2dbe 1569 $strerror = 'Error';
1570 }
1571
3c1ea58b 1572 $content = self::early_error_content($message, $moreinfourl, $link, $backtrace, $debuginfo);
5e39d7aa 1573
1574 return self::plain_page($strerror, $content);
c84a2dbe 1575 }
1576
f0f8f9a7
PS
1577 /**
1578 * Early notification message
1579 * @static
34223e03 1580 * @param string $message
41701ffd 1581 * @param string $classes usually notifyproblem or notifysuccess
f0f8f9a7
PS
1582 * @return string
1583 */
c84a2dbe 1584 public static function early_notification($message, $classes = 'notifyproblem') {
1585 return '<div class="' . $classes . '">' . $message . '</div>';
1586 }
5e39d7aa 1587
f0f8f9a7
PS
1588 /**
1589 * Page should redirect message.
1590 * @static
34223e03 1591 * @param string $encodedurl redirect url
f0f8f9a7
PS
1592 * @return string
1593 */
5e39d7aa 1594 public static function plain_redirect_message($encodedurl) {
41701ffd 1595 $message = '<div style="margin-top: 3em; margin-left:auto; margin-right:auto; text-align:center;">' . get_string('pageshouldredirect') . '<br /><a href="'.
f0f8f9a7 1596 $encodedurl .'">'. get_string('continue') .'</a></div>';
a0a268d5 1597 return self::plain_page(get_string('redirect'), $message);
5e39d7aa 1598 }
1599
f0f8f9a7
PS
1600 /**
1601 * Early redirection page, used before full init of $PAGE global
1602 * @static
34223e03
SH
1603 * @param string $encodedurl redirect url
1604 * @param string $message redirect message
1605 * @param int $delay time in seconds
41701ffd 1606 * @return string redirect page
f0f8f9a7
PS
1607 */
1608 public static function early_redirect_message($encodedurl, $message, $delay) {
1609 $meta = '<meta http-equiv="refresh" content="'. $delay .'; url='. $encodedurl .'" />';
1610 $content = self::early_error_content($message, null, null, null);
1611 $content .= self::plain_redirect_message($encodedurl);
1612
1613 return self::plain_page(get_string('redirect'), $content, $meta);
1614 }
1615
1616 /**
1617 * Output basic html page.
1618 * @static
34223e03
SH
1619 * @param string $title page title
1620 * @param string $content page content
41701ffd
PS
1621 * @param string $meta meta tag
1622 * @return string html page
f0f8f9a7 1623 */
48e114a5 1624 public static function plain_page($title, $content, $meta = '') {
5e39d7aa 1625 if (function_exists('get_string') && function_exists('get_html_lang')) {
1626 $htmllang = get_html_lang();
1627 } else {
1628 $htmllang = '';
1629 }
1630
48e114a5
PS
1631 return '<!DOCTYPE html>
1632<html ' . $htmllang . '>
5e39d7aa 1633<head>
1634<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
f0f8f9a7 1635'.$meta.'
5e39d7aa 1636<title>' . $title . '</title>
1637</head><body>' . $content . '</body></html>';
1638 }
c84a2dbe 1639}