Add MS-SQL to installer :-)
[moodle.git] / lib / accesslib.php
CommitLineData
bbbf2d40 1<?php
cee0901c 2 /**
3 * Capability session information format
bbbf2d40 4 * 2 x 2 array
5 * [context][capability]
6 * where context is the context id of the table 'context'
7 * and capability is a string defining the capability
8 * e.g.
9 *
10 * [Capabilities] => [26][mod/forum:viewpost] = 1
11 * [26][mod/forum:startdiscussion] = -8990
12 * [26][mod/forum:editallpost] = -1
13 * [273][moodle:blahblah] = 1
14 * [273][moodle:blahblahblah] = 2
15 */
bbbf2d40 16
17// permission definitions
e49e61bf 18define('CAP_INHERIT', 0);
bbbf2d40 19define('CAP_ALLOW', 1);
20define('CAP_PREVENT', -1);
21define('CAP_PROHIBIT', -1000);
22
bbbf2d40 23// context definitions
24define('CONTEXT_SYSTEM', 10);
25define('CONTEXT_PERSONAL', 20);
4b10f08b 26define('CONTEXT_USER', 30);
bbbf2d40 27define('CONTEXT_COURSECAT', 40);
28define('CONTEXT_COURSE', 50);
29define('CONTEXT_GROUP', 60);
30define('CONTEXT_MODULE', 70);
31define('CONTEXT_BLOCK', 80);
32
21b6db6e 33// capability risks - see http://docs.moodle.org/en/Hardening_new_Roles_system
34define('RISK_MANAGETRUST', 0x0001);
a6b02b65 35define('RISK_CONFIG', 0x0002);
21b6db6e 36define('RISK_XSS', 0x0004);
37define('RISK_PERSONAL', 0x0008);
38define('RISK_SPAM', 0x0010);
39
40
340ea4e8 41$context_cache = array(); // Cache of all used context objects for performance (by level and instance)
42$context_cache_id = array(); // Index to above cache by id
bbbf2d40 43
7700027f 44
e7876c1e 45/**
46 * Loads the capabilities for the default guest role to the current user in a specific context
47 * @return object
48 */
49function load_guest_role($context=NULL) {
50 global $USER;
51
52 static $guestrole;
53
54 if (!isloggedin()) {
55 return false;
56 }
57
58 if (!$sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID)) {
59 return false;
60 }
61
62 if (empty($context)) {
63 $context = $sitecontext;
64 }
65
66 if (empty($guestrole)) {
8f8ed475 67 if (!$guestrole = get_guest_role()) {
e7876c1e 68 return false;
69 }
70 }
71
eef868d1 72 if ($capabilities = get_records_select('role_capabilities',
e7876c1e 73 "roleid = $guestrole->id AND contextid = $sitecontext->id")) {
74 foreach ($capabilities as $capability) {
eef868d1 75 $USER->capabilities[$context->id][$capability->capability] = $capability->permission;
e7876c1e 76 }
77 }
78
79 return true;
80}
81
7700027f 82/**
83 * Load default not logged in role capabilities when user is not logged in
eef868d1 84 * @return bool
7700027f 85 */
20aeb4b8 86function load_notloggedin_role() {
87 global $CFG, $USER;
88
7700027f 89 if (!$sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID)) {
90 return false;
35a518c5 91 }
92
7700027f 93 if (empty($CFG->notloggedinroleid)) { // Let's set the default to the guest role
8f8ed475 94 if ($role = get_guest_role()) {
7700027f 95 set_config('notloggedinroleid', $role->id);
96 } else {
97 return false;
98 }
99 }
20aeb4b8 100
eef868d1 101 if ($capabilities = get_records_select('role_capabilities',
7700027f 102 "roleid = $CFG->notloggedinroleid AND contextid = $sitecontext->id")) {
103 foreach ($capabilities as $capability) {
eef868d1 104 $USER->capabilities[$sitecontext->id][$capability->capability] = $capability->permission;
7700027f 105 }
20aeb4b8 106 }
107
108 return true;
109}
cee0901c 110
8f8ed475 111/**
112 * Load default not logged in role capabilities when user is not logged in
eef868d1 113 * @return bool
8f8ed475 114 */
115function load_defaultuser_role() {
116 global $CFG, $USER;
117
118 if (!$sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID)) {
119 return false;
120 }
121
122 if (empty($CFG->defaultuserroleid)) { // Let's set the default to the guest role
123 if ($role = get_guest_role()) {
124 set_config('defaultuserroleid', $role->id);
125 } else {
126 return false;
127 }
128 }
129
eef868d1 130 if ($capabilities = get_records_select('role_capabilities',
8f8ed475 131 "roleid = $CFG->defaultuserroleid AND contextid = $sitecontext->id")) {
132 foreach ($capabilities as $capability) {
ca23ffdb 133 if (!isset($USER->capabilities[$sitecontext->id][$capability->capability])) { // Don't overwrite
eef868d1 134 $USER->capabilities[$sitecontext->id][$capability->capability] = $capability->permission;
ca23ffdb 135 }
8f8ed475 136 }
137
eef868d1 138 // SPECIAL EXCEPTION: If the default user role is actually a guest role, then
8f8ed475 139 // remove some capabilities so this user doesn't get confused with a REAL guest
2f089dd5 140 if (isset($USER->capabilities[$sitecontext->id]['moodle/legacy:guest']) and $USER->username != 'guest') {
eef868d1 141 unset($USER->capabilities[$sitecontext->id]['moodle/legacy:guest']);
8f8ed475 142 unset($USER->capabilities[$sitecontext->id]['moodle/course:view']); // No access to courses by default
143 }
144 }
145
146 return true;
147}
148
149
150/**
151 * Get the default guest role
152 * @return object role
153 */
154function get_guest_role() {
155 if ($roles = get_roles_with_capability('moodle/legacy:guest', CAP_ALLOW)) {
156 return array_shift($roles); // Pick the first one
157 } else {
158 return false;
159 }
160}
161
162
bbbf2d40 163/**
164 * This functions get all the course categories in proper order
0468976c 165 * @param int $context
bbbf2d40 166 * @param int $type
167 * @return array of contextids
168 */
0468976c 169function get_parent_cats($context, $type) {
eef868d1 170
98882637 171 $parents = array();
eef868d1 172
c5ddc3fd 173 switch ($type) {
98882637 174 case CONTEXT_COURSECAT:
c5ddc3fd 175 if (!$cat = get_record('course_categories','id',$context->instanceid)) {
176 break;
177 }
178
179 while (!empty($cat->parent)) {
180 if (!$context = get_context_instance(CONTEXT_COURSECAT, $cat->parent)) {
181 break;
182 }
98882637 183 $parents[] = $context->id;
184 $cat = get_record('course_categories','id',$cat->parent);
185 }
98882637 186 break;
eef868d1 187
98882637 188 case CONTEXT_COURSE:
c5ddc3fd 189 if (!$course = get_record('course', 'id', $context->instanceid)) {
190 break;
191 }
192 if (!$catinstance = get_context_instance(CONTEXT_COURSECAT, $course->category)) {
193 break;
194 }
195
98882637 196 $parents[] = $catinstance->id;
c5ddc3fd 197
198 if (!$cat = get_record('course_categories','id',$course->category)) {
199 break;
200 }
201
202 while (!empty($cat->parent)) {
203 if (!$context = get_context_instance(CONTEXT_COURSECAT, $cat->parent)) {
204 break;
205 }
98882637 206 $parents[] = $context->id;
207 $cat = get_record('course_categories','id',$cat->parent);
208 }
209 break;
eef868d1 210
98882637 211 default:
212 break;
98882637 213 }
98882637 214 return array_reverse($parents);
bbbf2d40 215}
216
217
cee0901c 218
0468976c 219/**
220 * This function checks for a capability assertion being true. If it isn't
221 * then the page is terminated neatly with a standard error message
222 * @param string $capability - name of the capability
223 * @param object $context - a context object (record from context table)
224 * @param integer $userid - a userid number
d74067e8 225 * @param bool $doanything - if false, ignore do anything
0468976c 226 * @param string $errorstring - an errorstring
d74067e8 227 * @param string $stringfile - which stringfile to get it from
0468976c 228 */
eef868d1 229function require_capability($capability, $context=NULL, $userid=NULL, $doanything=true,
d74067e8 230 $errormessage="nopermissions", $stringfile='') {
a9e1c058 231
232 global $USER;
233
234/// If the current user is not logged in, then make sure they are
235
236 if (empty($userid) and empty($USER->id)) {
aad2ba95 237 if ($context && ($context->contextlevel == CONTEXT_COURSE)) {
a9e1c058 238 require_login($context->instanceid);
11ac79ff 239 } else if ($context && ($context->contextlevel == CONTEXT_MODULE)) {
240 if ($cm = get_record('course_modules','id',$context->instanceid)) {
241 require_login($cm->course, true, $cm);
242 } else {
243 require_login();
244 }
a9e1c058 245 } else {
246 require_login();
247 }
248 }
eef868d1 249
a9e1c058 250/// OK, if they still don't have the capability then print a nice error message
251
d74067e8 252 if (!has_capability($capability, $context, $userid, $doanything)) {
0468976c 253 $capabilityname = get_capability_string($capability);
254 print_error($errormessage, $stringfile, '', $capabilityname);
255 }
256}
257
258
bbbf2d40 259/**
260 * This function returns whether the current user has the capability of performing a function
261 * For example, we can do has_capability('mod/forum:replypost',$cm) in forum
262 * only one of the 4 (moduleinstance, courseid, site, userid) would be set at 1 time
263 * This is a recursive funciton.
bbbf2d40 264 * @uses $USER
265 * @param string $capability - name of the capability
0468976c 266 * @param object $context - a context object (record from context table)
267 * @param integer $userid - a userid number
20aeb4b8 268 * @param bool $doanything - if false, ignore do anything
bbbf2d40 269 * @return bool
270 */
d74067e8 271function has_capability($capability, $context=NULL, $userid=NULL, $doanything=true) {
bbbf2d40 272
20aeb4b8 273 global $USER, $CONTEXT, $CFG;
bbbf2d40 274
a8a7300a 275 if (debugging() && !record_exists('capabilities', 'name', $capability)) {
7f7cacdf 276 debugging('Cabability "'.$capability.'" was not found! This should be fixed in code.');
a8a7300a 277 }
278
8f8ed475 279 if (empty($userid) && empty($USER->capabilities)) { // Real user, first time here
280 if (isloggedin()) {
281 load_defaultuser_role(); // All users get this by default
282 } else {
283 load_notloggedin_role(); // others get this by default
284 }
20aeb4b8 285 }
286
287 if ($userid && $userid != $USER->id) {
9425b25f 288 if (empty($USER->id) or ($userid != $USER->id)) {
289 $capabilities = load_user_capability($capability, $context, $userid);
290 } else { //$USER->id == $userid
291 $capabilities = empty($USER->capabilities) ? NULL : $USER->capabilities;
292 }
293 } else { // no userid
294 $capabilities = empty($USER->capabilities) ? NULL : $USER->capabilities;
98882637 295 }
9425b25f 296
0468976c 297 if (empty($context)) { // Use default CONTEXT if none specified
340ea4e8 298 if (empty($CONTEXT)) {
299 return false;
300 } else {
301 $context = $CONTEXT;
302 }
0468976c 303 } else { // A context was given to us
304 if (empty($CONTEXT)) {
305 $CONTEXT = $context; // Store FIRST used context in this global as future default
306 }
340ea4e8 307 }
bbbf2d40 308
20aeb4b8 309 if ($doanything) {
2d07587b 310
20aeb4b8 311 // Check site
2d07587b 312 if (empty($USER->switchrole[$context->id])) { // Ignore site setting if switchrole is active
313 $sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
314 if (isset($capabilities[$sitecontext->id]['moodle/site:doanything'])) {
315 return (0 < $capabilities[$sitecontext->id]['moodle/site:doanything']);
316 }
20aeb4b8 317 }
eef868d1 318
aad2ba95 319 switch ($context->contextlevel) {
eef868d1 320
20aeb4b8 321 case CONTEXT_COURSECAT:
322 // Check parent cats.
323 $parentcats = get_parent_cats($context, CONTEXT_COURSECAT);
324 foreach ($parentcats as $parentcat) {
325 if (isset($capabilities[$parentcat]['moodle/site:doanything'])) {
326 return (0 < $capabilities[$parentcat]['moodle/site:doanything']);
327 }
cee0901c 328 }
20aeb4b8 329 break;
bbbf2d40 330
20aeb4b8 331 case CONTEXT_COURSE:
332 // Check parent cat.
333 $parentcats = get_parent_cats($context, CONTEXT_COURSE);
98882637 334
20aeb4b8 335 foreach ($parentcats as $parentcat) {
336 if (isset($capabilities[$parentcat]['do_anything'])) {
337 return (0 < $capabilities[$parentcat]['do_anything']);
338 }
9425b25f 339 }
20aeb4b8 340 break;
bbbf2d40 341
20aeb4b8 342 case CONTEXT_GROUP:
343 // Find course.
344 $group = get_record('groups','id',$context->instanceid);
345 $courseinstance = get_context_instance(CONTEXT_COURSE, $group->courseid);
9425b25f 346
20aeb4b8 347 $parentcats = get_parent_cats($courseinstance, CONTEXT_COURSE);
348 foreach ($parentcats as $parentcat) {
349 if (isset($capabilities[$parentcat->id]['do_anything'])) {
350 return (0 < $capabilities[$parentcat->id]['do_anything']);
351 }
9425b25f 352 }
9425b25f 353
20aeb4b8 354 $coursecontext = '';
355 if (isset($capabilities[$courseinstance->id]['do_anything'])) {
356 return (0 < $capabilities[$courseinstance->id]['do_anything']);
357 }
9425b25f 358
20aeb4b8 359 break;
bbbf2d40 360
20aeb4b8 361 case CONTEXT_MODULE:
362 // Find course.
363 $cm = get_record('course_modules', 'id', $context->instanceid);
364 $courseinstance = get_context_instance(CONTEXT_COURSE, $cm->course);
9425b25f 365
20aeb4b8 366 if ($parentcats = get_parent_cats($courseinstance, CONTEXT_COURSE)) {
367 foreach ($parentcats as $parentcat) {
368 if (isset($capabilities[$parentcat]['do_anything'])) {
369 return (0 < $capabilities[$parentcat]['do_anything']);
370 }
cee0901c 371 }
9425b25f 372 }
98882637 373
20aeb4b8 374 if (isset($capabilities[$courseinstance->id]['do_anything'])) {
375 return (0 < $capabilities[$courseinstance->id]['do_anything']);
376 }
bbbf2d40 377
20aeb4b8 378 break;
bbbf2d40 379
20aeb4b8 380 case CONTEXT_BLOCK:
381 // 1 to 1 to course.
382 // Find course.
383 $block = get_record('block_instance','id',$context->instanceid);
384 $courseinstance = get_context_instance(CONTEXT_COURSE, $block->pageid); // needs check
9425b25f 385
20aeb4b8 386 $parentcats = get_parent_cats($courseinstance, CONTEXT_COURSE);
387 foreach ($parentcats as $parentcat) {
388 if (isset($capabilities[$parentcat]['do_anything'])) {
389 return (0 < $capabilities[$parentcat]['do_anything']);
390 }
cee0901c 391 }
9425b25f 392
20aeb4b8 393 if (isset($capabilities[$courseinstance->id]['do_anything'])) {
394 return (0 < $capabilities[$courseinstance->id]['do_anything']);
395 }
396 break;
bbbf2d40 397
20aeb4b8 398 default:
4b10f08b 399 // CONTEXT_SYSTEM: CONTEXT_PERSONAL: CONTEXT_USER:
20aeb4b8 400 // Do nothing.
401 break;
402 }
bbbf2d40 403
20aeb4b8 404 // Last: check self.
405 if (isset($capabilities[$context->id]['do_anything'])) {
406 return (0 < $capabilities[$context->id]['do_anything']);
407 }
98882637 408 }
98882637 409 // do_anything has not been set, we now look for it the normal way.
9425b25f 410 return (0 < capability_search($capability, $context, $capabilities));
bbbf2d40 411
9425b25f 412}
bbbf2d40 413
414
415/**
416 * In a separate function so that we won't have to deal with do_anything.
417 * again. Used by function has_capability.
418 * @param $capability - capability string
0468976c 419 * @param $context - the context object
bbbf2d40 420 * @param $capabilities - either $USER->capability or loaded array
421 * @return permission (int)
422 */
0468976c 423function capability_search($capability, $context, $capabilities) {
759ac72d 424
bbbf2d40 425 global $USER, $CFG;
0468976c 426
11ac79ff 427 if (!isset($context->id)) {
428 return 0;
429 }
430
0468976c 431 if (isset($capabilities[$context->id][$capability])) {
432 return ($capabilities[$context->id][$capability]);
bbbf2d40 433 }
9425b25f 434
bbbf2d40 435 /* Then, we check the cache recursively */
9425b25f 436 $permission = 0;
437
aad2ba95 438 switch ($context->contextlevel) {
bbbf2d40 439
440 case CONTEXT_SYSTEM: // by now it's a definite an inherit
441 $permission = 0;
442 break;
443
444 case CONTEXT_PERSONAL:
0468976c 445 $parentcontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
446 $permission = capability_search($capability, $parentcontext, $capabilities);
bbbf2d40 447 break;
9425b25f 448
4b10f08b 449 case CONTEXT_USER:
0468976c 450 $parentcontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
451 $permission = capability_search($capability, $parentcontext, $capabilities);
bbbf2d40 452 break;
9425b25f 453
bbbf2d40 454 case CONTEXT_COURSECAT: // Coursecat -> coursecat or site
455 $coursecat = get_record('course_categories','id',$context->instanceid);
0468976c 456 if (!empty($coursecat->parent)) { // return parent value if it exists
457 $parentcontext = get_context_instance(CONTEXT_COURSECAT, $coursecat->parent);
bbbf2d40 458 } else { // else return site value
0468976c 459 $parentcontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
bbbf2d40 460 }
0468976c 461 $permission = capability_search($capability, $parentcontext, $capabilities);
bbbf2d40 462 break;
463
464 case CONTEXT_COURSE: // 1 to 1 to course cat
465 // find the course cat, and return its value
466 $course = get_record('course','id',$context->instanceid);
0468976c 467 $parentcontext = get_context_instance(CONTEXT_COURSECAT, $course->category);
468 $permission = capability_search($capability, $parentcontext, $capabilities);
bbbf2d40 469 break;
470
471 case CONTEXT_GROUP: // 1 to 1 to course
472 $group = get_record('groups','id',$context->instanceid);
0468976c 473 $parentcontext = get_context_instance(CONTEXT_COURSE, $group->courseid);
474 $permission = capability_search($capability, $parentcontext, $capabilities);
bbbf2d40 475 break;
476
477 case CONTEXT_MODULE: // 1 to 1 to course
478 $cm = get_record('course_modules','id',$context->instanceid);
0468976c 479 $parentcontext = get_context_instance(CONTEXT_COURSE, $cm->course);
480 $permission = capability_search($capability, $parentcontext, $capabilities);
bbbf2d40 481 break;
482
483 case CONTEXT_BLOCK: // 1 to 1 to course
484 $block = get_record('block_instance','id',$context->instanceid);
0468976c 485 $parentcontext = get_context_instance(CONTEXT_COURSE, $block->pageid); // needs check
486 $permission = capability_search($capability, $parentcontext, $capabilities);
bbbf2d40 487 break;
488
489 default:
490 error ('This is an unknown context!');
491 return false;
492 }
9425b25f 493
98882637 494 return $permission;
bbbf2d40 495}
496
497
498/**
499 * This function should be called immediately after a login, when $USER is set.
500 * It will build an array of all the capabilities at each level
501 * i.e. site/metacourse/course_category/course/moduleinstance
502 * Note we should only load capabilities if they are explicitly assigned already,
503 * we should not load all module's capability!
504 * @param $userid - the id of the user whose capabilities we want to load
505 * @return array
506 * possible just s simple 2D array with [contextid][capabilityname]
507 * [Capabilities] => [26][forum_post] = 1
508 * [26][forum_start] = -8990
509 * [26][forum_edit] = -1
510 * [273][blah blah] = 1
511 * [273][blah blah blah] = 2
512 */
0468976c 513function load_user_capability($capability='', $context ='', $userid='') {
d140ad3f 514
98882637 515 global $USER, $CFG;
bbbf2d40 516
517 if (empty($userid)) {
dc411d1b 518 if (empty($USER->id)) { // We have no user to get capabilities for
64026e8c 519 debugging('User not logged in for load_user_capability!');
dc411d1b 520 return false;
521 }
64026e8c 522 unset($USER->capabilities); // We don't want possible older capabilites hanging around
523
524 check_enrolment_plugins($USER); // Call "enrol" system to ensure that we have the correct picture
8f8ed475 525
bbbf2d40 526 $userid = $USER->id;
dc411d1b 527 $otheruserid = false;
bbbf2d40 528 } else {
64026e8c 529 if (!$user = get_record('user', 'id', $userid)) {
530 debugging('Non-existent userid in load_user_capability!');
531 return false;
532 }
533
534 check_enrolment_plugins($user); // Ensure that we have the correct picture
535
9425b25f 536 $otheruserid = $userid;
bbbf2d40 537 }
9425b25f 538
5f70bcc3 539
540/// First we generate a list of all relevant contexts of the user
541
542 $usercontexts = array();
bbbf2d40 543
0468976c 544 if ($context) { // if context is specified
eef868d1 545 $usercontexts = get_parent_contexts($context);
98882637 546 } else { // else, we load everything
5f70bcc3 547 if ($userroles = get_records('role_assignments','userid',$userid)) {
548 foreach ($userroles as $userrole) {
549 $usercontexts[] = $userrole->contextid;
550 }
98882637 551 }
5f70bcc3 552 }
553
554/// Set up SQL fragments for searching contexts
555
556 if ($usercontexts) {
0468976c 557 $listofcontexts = '('.implode(',', $usercontexts).')';
5f70bcc3 558 $searchcontexts1 = "c1.id IN $listofcontexts AND";
5f70bcc3 559 } else {
c76e095f 560 $searchcontexts1 = '';
bbbf2d40 561 }
3ca2dea5 562
64026e8c 563 if ($capability) {
564 $capsearch = " AND rc.capability = '$capability' ";
565 } else {
eef868d1 566 $capsearch ="";
64026e8c 567 }
568
e38f38c3 569/// Set up SQL fragments for timestart, timeend etc
570 $now = time();
85f101fa 571 $timesql = "AND ((ra.timestart = 0 OR ra.timestart < $now) AND (ra.timeend = 0 OR ra.timeend > $now))";
e38f38c3 572
5f70bcc3 573/// Then we use 1 giant SQL to bring out all relevant capabilities.
574/// The first part gets the capabilities of orginal role.
575/// The second part gets the capabilities of overriden roles.
bbbf2d40 576
98882637 577 $siteinstance = get_context_instance(CONTEXT_SYSTEM, SITEID);
bbbf2d40 578
c76e095f 579 $SQL = " SELECT rc.capability, c1.id, (c1.contextlevel * 100) AS aggrlevel,
bbbf2d40 580 SUM(rc.permission) AS sum
581 FROM
eef868d1 582 {$CFG->prefix}role_assignments ra,
42ac3ecf 583 {$CFG->prefix}role_capabilities rc,
584 {$CFG->prefix}context c1
bbbf2d40 585 WHERE
d4649c76 586 ra.contextid=c1.id AND
587 ra.roleid=rc.roleid AND
bbbf2d40 588 ra.userid=$userid AND
5f70bcc3 589 $searchcontexts1
eef868d1 590 rc.contextid=$siteinstance->id
98882637 591 $capsearch
e38f38c3 592 $timesql
bbbf2d40 593 GROUP BY
aad2ba95 594 rc.capability, (c1.contextlevel * 100), c1.id
bbbf2d40 595 HAVING
41811960 596 SUM(rc.permission) != 0
bbbf2d40 597 UNION
598
c76e095f 599 SELECT rc.capability, c2.id, (c1.contextlevel * 100 + c2.contextlevel) AS aggrlevel,
bbbf2d40 600 SUM(rc.permission) AS sum
601 FROM
42ac3ecf 602 {$CFG->prefix}role_assignments ra,
603 {$CFG->prefix}role_capabilities rc,
604 {$CFG->prefix}context c1,
605 {$CFG->prefix}context c2
bbbf2d40 606 WHERE
d4649c76 607 ra.contextid=c1.id AND
eef868d1 608 ra.roleid=rc.roleid AND
609 ra.userid=$userid AND
610 rc.contextid=c2.id AND
5f70bcc3 611 $searchcontexts1
5f70bcc3 612 rc.contextid != $siteinstance->id
bbbf2d40 613 $capsearch
e38f38c3 614 $timesql
eef868d1 615
bbbf2d40 616 GROUP BY
c76e095f 617 rc.capability, (c1.contextlevel * 100 + c2.contextlevel), c2.id, c1.id
bbbf2d40 618 HAVING
41811960 619 SUM(rc.permission) != 0
bbbf2d40 620 ORDER BY
75e84883 621 aggrlevel ASC
bbbf2d40 622 ";
623
98882637 624 $capabilities = array(); // Reinitialize.
75e84883 625 if (!$rs = get_recordset_sql($SQL)) {
626 error("Query failed in load_user_capability.");
627 }
5cf38a57 628
bbbf2d40 629 if ($rs && $rs->RecordCount() > 0) {
630 while (!$rs->EOF) {
75e84883 631 $array = $rs->fields;
632 $temprecord = new object;
eef868d1 633
98882637 634 foreach ($array as $key=>$val) {
75e84883 635 if ($key == 'aggrlevel') {
aad2ba95 636 $temprecord->contextlevel = $val;
75e84883 637 } else {
638 $temprecord->{$key} = $val;
639 }
98882637 640 }
bbbf2d40 641 $capabilities[] = $temprecord;
642 $rs->MoveNext();
643 }
644 }
eef868d1 645
bbbf2d40 646 /* so up to this point we should have somethign like this
aad2ba95 647 * $capabilities[1] ->contextlevel = 1000
bbbf2d40 648 ->module = SITEID
649 ->capability = do_anything
650 ->id = 1 (id is the context id)
651 ->sum = 0
eef868d1 652
aad2ba95 653 * $capabilities[2] ->contextlevel = 1000
bbbf2d40 654 ->module = SITEID
655 ->capability = post_messages
656 ->id = 1
657 ->sum = -9000
658
aad2ba95 659 * $capabilittes[3] ->contextlevel = 3000
bbbf2d40 660 ->module = course
661 ->capability = view_course_activities
662 ->id = 25
663 ->sum = 1
664
aad2ba95 665 * $capabilittes[4] ->contextlevel = 3000
bbbf2d40 666 ->module = course
667 ->capability = view_course_activities
668 ->id = 26
669 ->sum = 0 (this is another course)
eef868d1 670
aad2ba95 671 * $capabilities[5] ->contextlevel = 3050
bbbf2d40 672 ->module = course
673 ->capability = view_course_activities
674 ->id = 25 (override in course 25)
675 ->sum = -1
676 * ....
677 * now we proceed to write the session array, going from top to bottom
678 * at anypoint, we need to go up and check parent to look for prohibit
679 */
680 // print_object($capabilities);
681
682 /* This is where we write to the actualy capabilities array
683 * what we need to do from here on is
684 * going down the array from lowest level to highest level
685 * 1) recursively check for prohibit,
686 * if any, we write prohibit
687 * else, we write the value
688 * 2) at an override level, we overwrite current level
689 * if it's not set to prohibit already, and if different
690 * ........ that should be it ........
691 */
98882637 692 $usercap = array(); // for other user's capabilities
bbbf2d40 693 foreach ($capabilities as $capability) {
694
7bfa3101 695 if (!$context = get_context_instance_by_id($capability->id)) {
696 continue; // incorrect stale context
697 }
0468976c 698
41811960 699 if (!empty($otheruserid)) { // we are pulling out other user's capabilities, do not write to session
eef868d1 700
0468976c 701 if (capability_prohibits($capability->capability, $context, $capability->sum, $usercap)) {
98882637 702 $usercap[$capability->id][$capability->capability] = -9000;
703 continue;
704 }
705
eef868d1 706 $usercap[$capability->id][$capability->capability] = $capability->sum;
707
98882637 708 } else {
709
0468976c 710 if (capability_prohibits($capability->capability, $context, $capability->sum)) { // if any parent or parent's parent is set to prohibit
98882637 711 $USER->capabilities[$capability->id][$capability->capability] = -9000;
712 continue;
713 }
eef868d1 714
98882637 715 // if no parental prohibit set
716 // just write to session, i am not sure this is correct yet
717 // since 3050 shows up after 3000, and 3070 shows up after 3050,
718 // it should be ok just to overwrite like this, provided that there's no
719 // parental prohibits
720 // no point writing 0, since 0 = inherit
721 // we need to write even if it's 0, because it could be an inherit override
722 $USER->capabilities[$capability->id][$capability->capability] = $capability->sum;
723 }
bbbf2d40 724 }
eef868d1 725
bbbf2d40 726 // now we don't care about the huge array anymore, we can dispose it.
727 unset($capabilities);
eef868d1 728
dbe7e582 729 if (!empty($otheruserid)) {
eef868d1 730 return $usercap; // return the array
bbbf2d40 731 }
732 // see array in session to see what it looks like
733
734}
735
64026e8c 736/*
737 * Check all the login enrolment information for the given user object
eef868d1 738 * by querying the enrolment plugins
64026e8c 739 */
740function check_enrolment_plugins(&$user) {
741 global $CFG;
742
e4ec4e41 743 static $inprogress; // To prevent this function being called more than once in an invocation
744
218eb651 745 if (!empty($inprogress[$user->id])) {
e4ec4e41 746 return;
747 }
748
218eb651 749 $inprogress[$user->id] = true; // Set the flag
e4ec4e41 750
64026e8c 751 require_once($CFG->dirroot .'/enrol/enrol.class.php');
eef868d1 752
64026e8c 753 if (!($plugins = explode(',', $CFG->enrol_plugins_enabled))) {
754 $plugins = array($CFG->enrol);
755 }
756
757 foreach ($plugins as $plugin) {
758 $enrol = enrolment_factory::factory($plugin);
759 if (method_exists($enrol, 'setup_enrolments')) { /// Plugin supports Roles (Moodle 1.7 and later)
760 $enrol->setup_enrolments($user);
761 } else { /// Run legacy enrolment methods
762 if (method_exists($enrol, 'get_student_courses')) {
763 $enrol->get_student_courses($user);
764 }
765 if (method_exists($enrol, 'get_teacher_courses')) {
766 $enrol->get_teacher_courses($user);
767 }
768
769 /// deal with $user->students and $user->teachers stuff
770 unset($user->student);
771 unset($user->teacher);
772 }
773 unset($enrol);
774 }
e4ec4e41 775
218eb651 776 unset($inprogress[$user->id]); // Unset the flag
64026e8c 777}
778
bbbf2d40 779
780/**
781 * This is a recursive function that checks whether the capability in this
782 * context, or the parent capabilities are set to prohibit.
783 *
784 * At this point, we can probably just use the values already set in the
785 * session variable, since we are going down the level. Any prohit set in
786 * parents would already reflect in the session.
787 *
788 * @param $capability - capability name
789 * @param $sum - sum of all capabilities values
0468976c 790 * @param $context - the context object
bbbf2d40 791 * @param $array - when loading another user caps, their caps are not stored in session but an array
792 */
0468976c 793function capability_prohibits($capability, $context, $sum='', $array='') {
bbbf2d40 794 global $USER;
0468976c 795
bbbf2d40 796 if ($sum < -8000) {
797 // If this capability is set to prohibit.
798 return true;
799 }
eef868d1 800
bbbf2d40 801 if (isset($array)) {
eef868d1 802 if (isset($array[$context->id][$capability])
0468976c 803 && $array[$context->id][$capability] < -8000) {
98882637 804 return true;
eef868d1 805 }
bbbf2d40 806 } else {
98882637 807 // Else if set in session.
eef868d1 808 if (isset($USER->capabilities[$context->id][$capability])
0468976c 809 && $USER->capabilities[$context->id][$capability] < -8000) {
98882637 810 return true;
811 }
bbbf2d40 812 }
aad2ba95 813 switch ($context->contextlevel) {
eef868d1 814
bbbf2d40 815 case CONTEXT_SYSTEM:
816 // By now it's a definite an inherit.
817 return 0;
818 break;
819
820 case CONTEXT_PERSONAL:
821 $parent = get_context_instance(CONTEXT_SYSTEM, SITEID);
0468976c 822 return capability_prohibits($capability, $parent);
bbbf2d40 823 break;
824
4b10f08b 825 case CONTEXT_USER:
bbbf2d40 826 $parent = get_context_instance(CONTEXT_SYSTEM, SITEID);
0468976c 827 return capability_prohibits($capability, $parent);
bbbf2d40 828 break;
829
830 case CONTEXT_COURSECAT:
831 // Coursecat -> coursecat or site.
832 $coursecat = get_record('course_categories','id',$context->instanceid);
41811960 833 if (!empty($coursecat->parent)) {
bbbf2d40 834 // return parent value if exist.
835 $parent = get_context_instance(CONTEXT_COURSECAT, $coursecat->parent);
836 } else {
837 // Return site value.
838 $parent = get_context_instance(CONTEXT_SYSTEM, SITEID);
839 }
0468976c 840 return capability_prohibits($capability, $parent);
bbbf2d40 841 break;
842
843 case CONTEXT_COURSE:
844 // 1 to 1 to course cat.
845 // Find the course cat, and return its value.
846 $course = get_record('course','id',$context->instanceid);
847 $parent = get_context_instance(CONTEXT_COURSECAT, $course->category);
0468976c 848 return capability_prohibits($capability, $parent);
bbbf2d40 849 break;
850
851 case CONTEXT_GROUP:
852 // 1 to 1 to course.
853 $group = get_record('groups','id',$context->instanceid);
854 $parent = get_context_instance(CONTEXT_COURSE, $group->courseid);
0468976c 855 return capability_prohibits($capability, $parent);
bbbf2d40 856 break;
857
858 case CONTEXT_MODULE:
859 // 1 to 1 to course.
860 $cm = get_record('course_modules','id',$context->instanceid);
861 $parent = get_context_instance(CONTEXT_COURSE, $cm->course);
0468976c 862 return capability_prohibits($capability, $parent);
bbbf2d40 863 break;
864
865 case CONTEXT_BLOCK:
866 // 1 to 1 to course.
867 $block = get_record('block_instance','id',$context->instanceid);
868 $parent = get_context_instance(CONTEXT_COURSE, $block->pageid); // needs check
0468976c 869 return capability_prohibits($capability, $parent);
bbbf2d40 870 break;
871
872 default:
873 error ('This is an unknown context!');
874 return false;
875 }
876}
877
878
879/**
880 * A print form function. This should either grab all the capabilities from
881 * files or a central table for that particular module instance, then present
882 * them in check boxes. Only relevant capabilities should print for known
883 * context.
884 * @param $mod - module id of the mod
885 */
886function print_capabilities($modid=0) {
887 global $CFG;
eef868d1 888
bbbf2d40 889 $capabilities = array();
890
891 if ($modid) {
892 // We are in a module specific context.
893
894 // Get the mod's name.
895 // Call the function that grabs the file and parse.
896 $cm = get_record('course_modules', 'id', $modid);
897 $module = get_record('modules', 'id', $cm->module);
eef868d1 898
bbbf2d40 899 } else {
900 // Print all capabilities.
901 foreach ($capabilities as $capability) {
902 // Prints the check box component.
903 }
904 }
905}
906
907
908/**
1afecc03 909 * Installs the roles system.
910 * This function runs on a fresh install as well as on an upgrade from the old
911 * hard-coded student/teacher/admin etc. roles to the new roles system.
bbbf2d40 912 */
1afecc03 913function moodle_install_roles() {
bbbf2d40 914
1afecc03 915 global $CFG, $db;
eef868d1 916
459c1ff1 917/// Create a system wide context for assignemnt.
bbbf2d40 918 $systemcontext = $context = get_context_instance(CONTEXT_SYSTEM, SITEID);
919
1afecc03 920
459c1ff1 921/// Create default/legacy roles and capabilities.
922/// (1 legacy capability per legacy role at system level).
923
924 $adminrole = create_role(get_string('administrator'), 'admin',
925 get_string('administratordescription'), 'moodle/legacy:admin');
926 $coursecreatorrole = create_role(get_string('coursecreators'), 'coursecreator',
927 get_string('coursecreatorsdescription'), 'moodle/legacy:coursecreator');
928 $editteacherrole = create_role(get_string('defaultcourseteacher'), 'editingteacher',
929 get_string('defaultcourseteacherdescription'), 'moodle/legacy:editingteacher');
930 $noneditteacherrole = create_role(get_string('noneditingteacher'), 'teacher',
931 get_string('noneditingteacherdescription'), 'moodle/legacy:teacher');
932 $studentrole = create_role(get_string('defaultcoursestudent'), 'student',
933 get_string('defaultcoursestudentdescription'), 'moodle/legacy:student');
934 $guestrole = create_role(get_string('guest'), 'guest',
935 get_string('guestdescription'), 'moodle/legacy:guest');
936
937/// Now is the correct moment to install capabilitites - after creation of legacy roles, but before assigning of roles
938
98882637 939 if (!assign_capability('moodle/site:doanything', CAP_ALLOW, $adminrole, $systemcontext->id)) {
bbbf2d40 940 error('Could not assign moodle/site:doanything to the admin role');
941 }
250934b8 942 if (!update_capabilities()) {
943 error('Had trouble upgrading the core capabilities for the Roles System');
944 }
1afecc03 945
459c1ff1 946/// Look inside user_admin, user_creator, user_teachers, user_students and
947/// assign above new roles. If a user has both teacher and student role,
948/// only teacher role is assigned. The assignment should be system level.
949
1afecc03 950 $dbtables = $db->MetaTables('TABLES');
eef868d1 951
1afecc03 952
459c1ff1 953/// Upgrade the admins.
954/// Sort using id ASC, first one is primary admin.
955
1afecc03 956 if (in_array($CFG->prefix.'user_admins', $dbtables)) {
f1dcf000 957 if ($rs = get_recordset_sql('SELECT * from '.$CFG->prefix.'user_admins ORDER BY ID ASC')) {
958 while (! $rs->EOF) {
959 $admin = $rs->FetchObj();
1afecc03 960 role_assign($adminrole, $admin->userid, 0, $systemcontext->id);
f1dcf000 961 $rs->MoveNext();
1afecc03 962 }
963 }
964 } else {
965 // This is a fresh install.
bbbf2d40 966 }
1afecc03 967
968
459c1ff1 969/// Upgrade course creators.
1afecc03 970 if (in_array($CFG->prefix.'user_coursecreators', $dbtables)) {
f1dcf000 971 if ($rs = get_recordset('user_coursecreators')) {
972 while (! $rs->EOF) {
973 $coursecreator = $rs->FetchObj();
56b4d70d 974 role_assign($coursecreatorrole, $coursecreator->userid, 0, $systemcontext->id);
f1dcf000 975 $rs->MoveNext();
1afecc03 976 }
977 }
bbbf2d40 978 }
979
1afecc03 980
459c1ff1 981/// Upgrade editting teachers and non-editting teachers.
1afecc03 982 if (in_array($CFG->prefix.'user_teachers', $dbtables)) {
f1dcf000 983 if ($rs = get_recordset('user_teachers')) {
984 while (! $rs->EOF) {
985 $teacher = $rs->FetchObj();
986
17d6a25e 987 // populate the user_lastaccess table
ece4945b 988 $access = new object();
17d6a25e 989 $access->timeaccess = $teacher->timeaccess;
990 $access->userid = $teacher->userid;
991 $access->courseid = $teacher->course;
992 insert_record('user_lastaccess', $access);
f1dcf000 993
17d6a25e 994 // assign the default student role
1afecc03 995 $coursecontext = get_context_instance(CONTEXT_COURSE, $teacher->course); // needs cache
996 if ($teacher->editall) { // editting teacher
997 role_assign($editteacherrole, $teacher->userid, 0, $coursecontext->id);
998 } else {
999 role_assign($noneditteacherrole, $teacher->userid, 0, $coursecontext->id);
1000 }
f1dcf000 1001
1002 $rs->MoveNext();
1afecc03 1003 }
bbbf2d40 1004 }
1005 }
1afecc03 1006
1007
459c1ff1 1008/// Upgrade students.
1afecc03 1009 if (in_array($CFG->prefix.'user_students', $dbtables)) {
f1dcf000 1010 if ($rs = get_recordset('user_students')) {
1011 while (! $rs->EOF) {
1012 $student = $rs->FetchObj();
1013
17d6a25e 1014 // populate the user_lastaccess table
f1dcf000 1015 $access = new object;
17d6a25e 1016 $access->timeaccess = $student->timeaccess;
1017 $access->userid = $student->userid;
1018 $access->courseid = $student->course;
1019 insert_record('user_lastaccess', $access);
f1dcf000 1020
17d6a25e 1021 // assign the default student role
1afecc03 1022 $coursecontext = get_context_instance(CONTEXT_COURSE, $student->course);
1023 role_assign($studentrole, $student->userid, 0, $coursecontext->id);
f1dcf000 1024
1025 $rs->MoveNext();
1afecc03 1026 }
1027 }
bbbf2d40 1028 }
1afecc03 1029
1030
459c1ff1 1031/// Upgrade guest (only 1 entry).
1afecc03 1032 if ($guestuser = get_record('user', 'username', 'guest')) {
1033 role_assign($guestrole, $guestuser->id, 0, $systemcontext->id);
1034 }
1035
459c1ff1 1036
1037/// Insert the correct records for legacy roles
945f88ca 1038 allow_assign($adminrole, $adminrole);
1039 allow_assign($adminrole, $coursecreatorrole);
1040 allow_assign($adminrole, $noneditteacherrole);
eef868d1 1041 allow_assign($adminrole, $editteacherrole);
945f88ca 1042 allow_assign($adminrole, $studentrole);
1043 allow_assign($adminrole, $guestrole);
eef868d1 1044
945f88ca 1045 allow_assign($coursecreatorrole, $noneditteacherrole);
1046 allow_assign($coursecreatorrole, $editteacherrole);
eef868d1 1047 allow_assign($coursecreatorrole, $studentrole);
945f88ca 1048 allow_assign($coursecreatorrole, $guestrole);
eef868d1 1049
1050 allow_assign($editteacherrole, $noneditteacherrole);
1051 allow_assign($editteacherrole, $studentrole);
945f88ca 1052 allow_assign($editteacherrole, $guestrole);
eef868d1 1053
459c1ff1 1054/// Set up default permissions for overrides
945f88ca 1055 allow_override($adminrole, $adminrole);
1056 allow_override($adminrole, $coursecreatorrole);
1057 allow_override($adminrole, $noneditteacherrole);
eef868d1 1058 allow_override($adminrole, $editteacherrole);
945f88ca 1059 allow_override($adminrole, $studentrole);
eef868d1 1060 allow_override($adminrole, $guestrole);
1afecc03 1061
746a04c5 1062
459c1ff1 1063/// Delete the old user tables when we are done
1064
1065 /// XXX TODO
1066
bbbf2d40 1067}
1068
bbbf2d40 1069/**
1070 * Assign the defaults found in this capabality definition to roles that have
1071 * the corresponding legacy capabilities assigned to them.
1072 * @param $legacyperms - an array in the format (example):
1073 * 'guest' => CAP_PREVENT,
1074 * 'student' => CAP_ALLOW,
1075 * 'teacher' => CAP_ALLOW,
1076 * 'editingteacher' => CAP_ALLOW,
1077 * 'coursecreator' => CAP_ALLOW,
1078 * 'admin' => CAP_ALLOW
1079 * @return boolean - success or failure.
1080 */
1081function assign_legacy_capabilities($capability, $legacyperms) {
eef868d1 1082
bbbf2d40 1083 foreach ($legacyperms as $type => $perm) {
eef868d1 1084
bbbf2d40 1085 $systemcontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
eef868d1 1086
bbbf2d40 1087 // The legacy capabilities are:
1088 // 'moodle/legacy:guest'
1089 // 'moodle/legacy:student'
1090 // 'moodle/legacy:teacher'
1091 // 'moodle/legacy:editingteacher'
1092 // 'moodle/legacy:coursecreator'
1093 // 'moodle/legacy:admin'
eef868d1 1094
2e85fffe 1095 if ($roles = get_roles_with_capability('moodle/legacy:'.$type, CAP_ALLOW)) {
1096 foreach ($roles as $role) {
1097 // Assign a site level capability.
1098 if (!assign_capability($capability, $perm, $role->id, $systemcontext->id)) {
1099 return false;
1100 }
bbbf2d40 1101 }
1102 }
1103 }
1104 return true;
1105}
1106
1107
cee0901c 1108/**
1109 * Checks to see if a capability is a legacy capability.
1110 * @param $capabilityname
1111 * @return boolean
1112 */
bbbf2d40 1113function islegacy($capabilityname) {
98882637 1114 if (strstr($capabilityname, 'legacy') === false) {
eef868d1 1115 return false;
98882637 1116 } else {
eef868d1 1117 return true;
98882637 1118 }
bbbf2d40 1119}
1120
cee0901c 1121
1122
1123/**********************************
bbbf2d40 1124 * Context Manipulation functions *
1125 **********************************/
1126
bbbf2d40 1127/**
9991d157 1128 * Create a new context record for use by all roles-related stuff
bbbf2d40 1129 * @param $level
1130 * @param $instanceid
3ca2dea5 1131 *
1132 * @return object newly created context (or existing one with a debug warning)
bbbf2d40 1133 */
aad2ba95 1134function create_context($contextlevel, $instanceid) {
3ca2dea5 1135 if (!$context = get_record('context','contextlevel',$contextlevel,'instanceid',$instanceid)) {
1136 if (!validate_context($contextlevel, $instanceid)) {
1137 debugging('Error: Invalid context creation request for level "'.s($contextlevel).'", instance "'.s($instanceid).'".');
1138 return NULL;
1139 }
1140 $context = new object();
aad2ba95 1141 $context->contextlevel = $contextlevel;
bbbf2d40 1142 $context->instanceid = $instanceid;
3ca2dea5 1143 if ($id = insert_record('context',$context)) {
1144 return get_record('context','id',$id);
1145 } else {
1146 debugging('Error: could not insert new context level "'.s($contextlevel).'", instance "'.s($instanceid).'".');
1147 return NULL;
1148 }
1149 } else {
1150 debugging('Warning: Context id "'.s($context->id).'" not created, because it already exists.');
1151 return $context;
bbbf2d40 1152 }
1153}
1154
9991d157 1155/**
1156 * Create a new context record for use by all roles-related stuff
1157 * @param $level
1158 * @param $instanceid
3ca2dea5 1159 *
1160 * @return true if properly deleted
9991d157 1161 */
1162function delete_context($contextlevel, $instanceid) {
1163 if ($context = get_context_instance($contextlevel, $instanceid)) {
1164 return delete_records('context', 'id', $context->id) &&
1165 delete_records('role_assignments', 'contextid', $context->id) &&
1166 delete_records('role_role_capabilities', 'contextid', $context->id);
1167 }
1168 return true;
1169}
1170
3ca2dea5 1171/**
1172 * Validate that object with instanceid really exists in given context level.
1173 *
1174 * return if instanceid object exists
1175 */
1176function validate_context($contextlevel, $instanceid) {
1177 switch ($contextlevel) {
1178
1179 case CONTEXT_SYSTEM:
1180 return ($instanceid == SITEID);
1181
1182 case CONTEXT_PERSONAL:
1183 return (boolean)count_records('user', 'id', $instanceid);
1184
1185 case CONTEXT_USER:
1186 return (boolean)count_records('user', 'id', $instanceid);
1187
1188 case CONTEXT_COURSECAT:
1cd3eba9 1189 if ($instanceid == 0) {
1190 return true; // site course category
1191 }
3ca2dea5 1192 return (boolean)count_records('course_categories', 'id', $instanceid);
1193
1194 case CONTEXT_COURSE:
1195 return (boolean)count_records('course', 'id', $instanceid);
1196
1197 case CONTEXT_GROUP:
1198 return (boolean)count_records('groups', 'id', $instanceid);
1199
1200 case CONTEXT_MODULE:
1201 return (boolean)count_records('course_modules', 'id', $instanceid);
1202
1203 case CONTEXT_BLOCK:
1204 return (boolean)count_records('block_instance', 'id', $instanceid);
1205
1206 default:
1207 return false;
1208 }
1209}
bbbf2d40 1210
1211/**
1212 * Get the context instance as an object. This function will create the
1213 * context instance if it does not exist yet.
1214 * @param $level
1215 * @param $instance
1216 */
aad2ba95 1217function get_context_instance($contextlevel=NULL, $instance=SITEID) {
e5605780 1218
51195e6f 1219 global $context_cache, $context_cache_id, $CONTEXT;
a36a3a3f 1220 static $allowed_contexts = array(CONTEXT_SYSTEM, CONTEXT_PERSONAL, CONTEXT_USER, CONTEXT_COURSECAT, CONTEXT_COURSE, CONTEXT_GROUP, CONTEXT_MODULE, CONTEXT_BLOCK);
d9a35e12 1221
340ea4e8 1222/// If no level is supplied then return the current global context if there is one
aad2ba95 1223 if (empty($contextlevel)) {
340ea4e8 1224 if (empty($CONTEXT)) {
a36a3a3f 1225 //fatal error, code must be fixed
1226 error("Error: get_context_instance() called without a context");
340ea4e8 1227 } else {
1228 return $CONTEXT;
1229 }
e5605780 1230 }
1231
a36a3a3f 1232/// check allowed context levels
1233 if (!in_array($contextlevel, $allowed_contexts)) {
7bfa3101 1234 // fatal error, code must be fixed - probably typo or switched parameters
a36a3a3f 1235 error('Error: get_context_instance() called with incorrect context level "'.s($contextlevel).'"');
1236 }
1237
340ea4e8 1238/// Check the cache
aad2ba95 1239 if (isset($context_cache[$contextlevel][$instance])) { // Already cached
1240 return $context_cache[$contextlevel][$instance];
e5605780 1241 }
1242
340ea4e8 1243/// Get it from the database, or create it
aad2ba95 1244 if (!$context = get_record('context', 'contextlevel', $contextlevel, 'instanceid', $instance)) {
1245 create_context($contextlevel, $instance);
1246 $context = get_record('context', 'contextlevel', $contextlevel, 'instanceid', $instance);
e5605780 1247 }
1248
ccfc5ecc 1249/// Only add to cache if context isn't empty.
1250 if (!empty($context)) {
aad2ba95 1251 $context_cache[$contextlevel][$instance] = $context; // Cache it for later
ccfc5ecc 1252 $context_cache_id[$context->id] = $context; // Cache it for later
1253 }
0468976c 1254
bbbf2d40 1255 return $context;
1256}
1257
cee0901c 1258
340ea4e8 1259/**
1260 * Get a context instance as an object, from a given id.
1261 * @param $id
1262 */
1263function get_context_instance_by_id($id) {
1264
d9a35e12 1265 global $context_cache, $context_cache_id;
1266
340ea4e8 1267 if (isset($context_cache_id[$id])) { // Already cached
75e84883 1268 return $context_cache_id[$id];
340ea4e8 1269 }
1270
1271 if ($context = get_record('context', 'id', $id)) { // Update the cache and return
aad2ba95 1272 $context_cache[$context->contextlevel][$context->instanceid] = $context;
340ea4e8 1273 $context_cache_id[$context->id] = $context;
1274 return $context;
1275 }
1276
1277 return false;
1278}
1279
bbbf2d40 1280
8737be58 1281/**
1282 * Get the local override (if any) for a given capability in a role in a context
1283 * @param $roleid
0468976c 1284 * @param $contextid
1285 * @param $capability
8737be58 1286 */
1287function get_local_override($roleid, $contextid, $capability) {
1288 return get_record('role_capabilities', 'roleid', $roleid, 'capability', $capability, 'contextid', $contextid);
1289}
1290
1291
bbbf2d40 1292
1293/************************************
1294 * DB TABLE RELATED FUNCTIONS *
1295 ************************************/
1296
cee0901c 1297/**
bbbf2d40 1298 * function that creates a role
1299 * @param name - role name
31f26796 1300 * @param shortname - role short name
bbbf2d40 1301 * @param description - role description
1302 * @param legacy - optional legacy capability
1303 * @return id or false
1304 */
8420bee9 1305function create_role($name, $shortname, $description, $legacy='') {
eef868d1 1306
98882637 1307 // check for duplicate role name
eef868d1 1308
98882637 1309 if ($role = get_record('role','name', $name)) {
eef868d1 1310 error('there is already a role with this name!');
98882637 1311 }
eef868d1 1312
31f26796 1313 if ($role = get_record('role','shortname', $shortname)) {
eef868d1 1314 error('there is already a role with this shortname!');
31f26796 1315 }
1316
b5959f30 1317 $role = new object();
98882637 1318 $role->name = $name;
31f26796 1319 $role->shortname = $shortname;
98882637 1320 $role->description = $description;
eef868d1 1321
8420bee9 1322 //find free sortorder number
1323 $role->sortorder = count_records('role');
1324 while (get_record('role','sortorder', $role->sortorder)) {
1325 $role->sortorder += 1;
b5959f30 1326 }
1327
eef868d1 1328 $context = get_context_instance(CONTEXT_SYSTEM, SITEID);
1329
98882637 1330 if ($id = insert_record('role', $role)) {
eef868d1 1331 if ($legacy) {
1332 assign_capability($legacy, CAP_ALLOW, $id, $context->id);
98882637 1333 }
eef868d1 1334
ec7a8b79 1335 /// By default, users with role:manage at site level
1336 /// should be able to assign users to this new role, and override this new role's capabilities
eef868d1 1337
ec7a8b79 1338 // find all admin roles
e46c0987 1339 if ($adminroles = get_roles_with_capability('moodle/role:manage', CAP_ALLOW, $context)) {
1340 // foreach admin role
1341 foreach ($adminroles as $arole) {
1342 // write allow_assign and allow_overrid
1343 allow_assign($arole->id, $id);
eef868d1 1344 allow_override($arole->id, $id);
e46c0987 1345 }
ec7a8b79 1346 }
eef868d1 1347
98882637 1348 return $id;
1349 } else {
eef868d1 1350 return false;
98882637 1351 }
eef868d1 1352
bbbf2d40 1353}
1354
8420bee9 1355/**
1356 * function that deletes a role and cleanups up after it
1357 * @param roleid - id of role to delete
1358 * @return success
1359 */
1360function delete_role($roleid) {
1361 $success = true;
1362
1363// first unssign all users
1364 if (!role_unassign($roleid)) {
1365 debugging("Error while unassigning all users from role with ID $roleid!");
1366 $success = false;
1367 }
1368
1369// cleanup all references to this role, ignore errors
1370 if ($success) {
1371 delete_records('role_capabilities', 'roleid', $roleid);
1372 delete_records('role_allow_assign', 'roleid', $roleid);
1373 delete_records('role_allow_assign', 'allowassign', $roleid);
1374 delete_records('role_allow_override', 'roleid', $roleid);
1375 delete_records('role_allow_override', 'allowoverride', $roleid);
1376 delete_records('role_names', 'roleid', $roleid);
1377 }
1378
1379// finally delete the role itself
1380 if ($success and !delete_records('role', 'id', $roleid)) {
ece4945b 1381 debugging("Could not delete role record with ID $roleid!");
8420bee9 1382 $success = false;
1383 }
1384
1385 return $success;
1386}
1387
bbbf2d40 1388/**
1389 * Function to write context specific overrides, or default capabilities.
1390 * @param module - string name
1391 * @param capability - string name
1392 * @param contextid - context id
1393 * @param roleid - role id
1394 * @param permission - int 1,-1 or -1000
1395 */
e7876c1e 1396function assign_capability($capability, $permission, $roleid, $contextid, $overwrite=false) {
eef868d1 1397
98882637 1398 global $USER;
eef868d1 1399
98882637 1400 if (empty($permission) || $permission == 0) { // if permission is not set
eef868d1 1401 unassign_capability($capability, $roleid, $contextid);
98882637 1402 }
eef868d1 1403
2e85fffe 1404 $existing = get_record('role_capabilities', 'contextid', $contextid, 'roleid', $roleid, 'capability', $capability);
e7876c1e 1405
1406 if ($existing and !$overwrite) { // We want to keep whatever is there already
1407 return true;
1408 }
1409
bbbf2d40 1410 $cap = new object;
1411 $cap->contextid = $contextid;
1412 $cap->roleid = $roleid;
1413 $cap->capability = $capability;
1414 $cap->permission = $permission;
1415 $cap->timemodified = time();
9db12da7 1416 $cap->modifierid = empty($USER->id) ? 0 : $USER->id;
e7876c1e 1417
1418 if ($existing) {
1419 $cap->id = $existing->id;
1420 return update_record('role_capabilities', $cap);
1421 } else {
1422 return insert_record('role_capabilities', $cap);
1423 }
bbbf2d40 1424}
1425
1426
1427/**
1428 * Unassign a capability from a role.
1429 * @param $roleid - the role id
1430 * @param $capability - the name of the capability
1431 * @return boolean - success or failure
1432 */
1433function unassign_capability($capability, $roleid, $contextid=NULL) {
eef868d1 1434
98882637 1435 if (isset($contextid)) {
1436 $status = delete_records('role_capabilities', 'capability', $capability,
1437 'roleid', $roleid, 'contextid', $contextid);
1438 } else {
1439 $status = delete_records('role_capabilities', 'capability', $capability,
1440 'roleid', $roleid);
1441 }
1442 return $status;
bbbf2d40 1443}
1444
1445
1446/**
759ac72d 1447 * Get the roles that have a given capability assigned to it. This function
1448 * does not resolve the actual permission of the capability. It just checks
1449 * for assignment only.
bbbf2d40 1450 * @param $capability - capability name (string)
1451 * @param $permission - optional, the permission defined for this capability
1452 * either CAP_ALLOW, CAP_PREVENT or CAP_PROHIBIT
1453 * @return array or role objects
1454 */
ec7a8b79 1455function get_roles_with_capability($capability, $permission=NULL, $context='') {
1456
bbbf2d40 1457 global $CFG;
eef868d1 1458
ec7a8b79 1459 if ($context) {
1460 if ($contexts = get_parent_contexts($context)) {
1461 $listofcontexts = '('.implode(',', $contexts).')';
1462 } else {
1463 $sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
eef868d1 1464 $listofcontexts = '('.$sitecontext->id.')'; // must be site
1465 }
42ac3ecf 1466 $contextstr = "AND (rc.contextid = '$context->id' OR rc.contextid IN $listofcontexts)";
ec7a8b79 1467 } else {
1468 $contextstr = '';
1469 }
eef868d1 1470
1471 $selectroles = "SELECT r.*
42ac3ecf 1472 FROM {$CFG->prefix}role r,
1473 {$CFG->prefix}role_capabilities rc
bbbf2d40 1474 WHERE rc.capability = '$capability'
ec7a8b79 1475 AND rc.roleid = r.id $contextstr";
bbbf2d40 1476
1477 if (isset($permission)) {
1478 $selectroles .= " AND rc.permission = '$permission'";
1479 }
1480 return get_records_sql($selectroles);
1481}
1482
1483
1484/**
a9e1c058 1485 * This function makes a role-assignment (a role for a user or group in a particular context)
bbbf2d40 1486 * @param $roleid - the role of the id
1487 * @param $userid - userid
1488 * @param $groupid - group id
1489 * @param $contextid - id of the context
1490 * @param $timestart - time this assignment becomes effective
1491 * @param $timeend - time this assignemnt ceases to be effective
1492 * @uses $USER
1493 * @return id - new id of the assigment
1494 */
f44152f4 1495function role_assign($roleid, $userid, $groupid, $contextid, $timestart=0, $timeend=0, $hidden=0, $enrol='manual') {
aa311411 1496 global $USER, $CFG;
bbbf2d40 1497
7eb0b60a 1498 debugging("Assign roleid $roleid userid $userid contextid $contextid", DEBUG_DEVELOPER);
bbbf2d40 1499
a9e1c058 1500/// Do some data validation
1501
bbbf2d40 1502 if (empty($roleid)) {
9d829c68 1503 debugging('Role ID not provided');
a9e1c058 1504 return false;
bbbf2d40 1505 }
1506
1507 if (empty($userid) && empty($groupid)) {
9d829c68 1508 debugging('Either userid or groupid must be provided');
a9e1c058 1509 return false;
bbbf2d40 1510 }
eef868d1 1511
7700027f 1512 if ($userid && !record_exists('user', 'id', $userid)) {
82396e5b 1513 debugging('User ID '.intval($userid).' does not exist!');
7700027f 1514 return false;
1515 }
bbbf2d40 1516
dc411d1b 1517 if ($groupid && !record_exists('groups', 'id', $groupid)) {
82396e5b 1518 debugging('Group ID '.intval($groupid).' does not exist!');
dc411d1b 1519 return false;
1520 }
1521
7700027f 1522 if (!$context = get_context_instance_by_id($contextid)) {
82396e5b 1523 debugging('Context ID '.intval($contextid).' does not exist!');
a9e1c058 1524 return false;
bbbf2d40 1525 }
1526
a9e1c058 1527 if (($timestart and $timeend) and ($timestart > $timeend)) {
9d829c68 1528 debugging('The end time can not be earlier than the start time');
a9e1c058 1529 return false;
1530 }
1531
7700027f 1532
a9e1c058 1533/// Check for existing entry
1534 if ($userid) {
7700027f 1535 $ra = get_record('role_assignments', 'roleid', $roleid, 'contextid', $context->id, 'userid', $userid);
a9e1c058 1536 } else {
7700027f 1537 $ra = get_record('role_assignments', 'roleid', $roleid, 'contextid', $context->id, 'groupid', $groupid);
a9e1c058 1538 }
1539
9ebcb4d2 1540
a9e1c058 1541 $newra = new object;
bbbf2d40 1542
a9e1c058 1543 if (empty($ra)) { // Create a new entry
1544 $newra->roleid = $roleid;
7700027f 1545 $newra->contextid = $context->id;
a9e1c058 1546 $newra->userid = $userid;
1547 $newra->groupid = $groupid;
1548
1549 $newra->hidden = $hidden;
f44152f4 1550 $newra->enrol = $enrol;
a9e1c058 1551 $newra->timestart = $timestart;
1552 $newra->timeend = $timeend;
1553 $newra->timemodified = time();
1554 $newra->modifier = empty($USER->id) ? 0 : $USER->id;
1555
9ebcb4d2 1556 $success = insert_record('role_assignments', $newra);
a9e1c058 1557
1558 } else { // We already have one, just update it
1559
1560 $newra->id = $ra->id;
1561 $newra->hidden = $hidden;
f44152f4 1562 $newra->enrol = $enrol;
a9e1c058 1563 $newra->timestart = $timestart;
1564 $newra->timeend = $timeend;
1565 $newra->timemodified = time();
1566 $newra->modifier = empty($USER->id) ? 0 : $USER->id;
1567
9ebcb4d2 1568 $success = update_record('role_assignments', $newra);
1569 }
1570
7700027f 1571 if ($success) { /// Role was assigned, so do some other things
1572
1573 /// If the user is the current user, then reload the capabilities too.
1574 if (!empty($USER->id) && $USER->id == $userid) {
1575 load_user_capability();
1576 }
1577
0f161e1f 1578 /// Ask all the modules if anything needs to be done for this user
1579 if ($mods = get_list_of_plugins('mod')) {
1580 foreach ($mods as $mod) {
1581 include_once($CFG->dirroot.'/mod/'.$mod.'/lib.php');
1582 $functionname = $mod.'_role_assign';
1583 if (function_exists($functionname)) {
1584 $functionname($userid, $context);
1585 }
1586 }
1587 }
1588
1589 /// Make sure they have an entry in user_lastaccess for courses they can access
1590 // role_add_lastaccess_entries($userid, $context);
a9e1c058 1591 }
eef868d1 1592
4e5f3064 1593 /// now handle metacourse role assignments if in course context
aad2ba95 1594 if ($success and $context->contextlevel == CONTEXT_COURSE) {
4e5f3064 1595 if ($parents = get_records('course_meta', 'child_course', $context->instanceid)) {
1596 foreach ($parents as $parent) {
1aad4310 1597 sync_metacourse($parent->parent_course);
4e5f3064 1598 }
1599 }
1600 }
6eb4f823 1601
1602 return $success;
bbbf2d40 1603}
1604
1605
1606/**
1dc1f037 1607 * Deletes one or more role assignments. You must specify at least one parameter.
bbbf2d40 1608 * @param $roleid
1609 * @param $userid
1610 * @param $groupid
1611 * @param $contextid
1612 * @return boolean - success or failure
1613 */
1dc1f037 1614function role_unassign($roleid=0, $userid=0, $groupid=0, $contextid=0) {
d74067e8 1615
1616 global $USER, $CFG;
eef868d1 1617
4e5f3064 1618 $success = true;
d74067e8 1619
1dc1f037 1620 $args = array('roleid', 'userid', 'groupid', 'contextid');
1621 $select = array();
1622 foreach ($args as $arg) {
1623 if ($$arg) {
1624 $select[] = $arg.' = '.$$arg;
1625 }
1626 }
d74067e8 1627
1dc1f037 1628 if ($select) {
4e5f3064 1629 if ($ras = get_records_select('role_assignments', implode(' AND ', $select))) {
1630 $mods = get_list_of_plugins('mod');
1631 foreach($ras as $ra) {
86e2c51d 1632 /// infinite loop protection when deleting recursively
1633 if (!$ra = get_record('role_assignments', 'id', $ra->id)) {
1634 continue;
1635 }
4e5f3064 1636 $success = delete_records('role_assignments', 'id', $ra->id) and $success;
86e2c51d 1637
4e5f3064 1638 /// If the user is the current user, then reload the capabilities too.
1639 if (!empty($USER->id) && $USER->id == $ra->userid) {
1640 load_user_capability();
1641 }
1642 $context = get_record('context', 'id', $ra->contextid);
0f161e1f 1643
1644 /// Ask all the modules if anything needs to be done for this user
4e5f3064 1645 foreach ($mods as $mod) {
1646 include_once($CFG->dirroot.'/mod/'.$mod.'/lib.php');
1647 $functionname = $mod.'_role_unassign';
1648 if (function_exists($functionname)) {
1649 $functionname($ra->userid, $context); // watch out, $context might be NULL if something goes wrong
1650 }
1651 }
1652
1653 /// now handle metacourse role unassigment and removing from goups if in course context
aad2ba95 1654 if (!empty($context) and $context->contextlevel == CONTEXT_COURSE) {
4e5f3064 1655 //remove from groups when user has no role
1656 $roles = get_user_roles($context, $ra->userid, true);
1657 if (empty($roles)) {
1658 if ($groups = get_groups($context->instanceid, $ra->userid)) {
1659 foreach ($groups as $group) {
1660 delete_records('groups_members', 'groupid', $group->id, 'userid', $ra->userid);
1661 }
1662 }
1663 }
1aad4310 1664 //unassign roles in metacourses if needed
4e5f3064 1665 if ($parents = get_records('course_meta', 'child_course', $context->instanceid)) {
1666 foreach ($parents as $parent) {
1aad4310 1667 sync_metacourse($parent->parent_course);
0f161e1f 1668 }
1669 }
0f161e1f 1670 }
1671 }
d74067e8 1672 }
1dc1f037 1673 }
4e5f3064 1674
1675 return $success;
bbbf2d40 1676}
1677
eef868d1 1678/*
1679 * A convenience function to take care of the common case where you
b963384f 1680 * just want to enrol someone using the default role into a course
1681 *
1682 * @param object $course
1683 * @param object $user
1684 * @param string $enrol - the plugin used to do this enrolment
1685 */
1686function enrol_into_course($course, $user, $enrol) {
1687
1688 if ($course->enrolperiod) {
1689 $timestart = time();
1690 $timeend = time() + $course->enrolperiod;
1691 } else {
1692 $timestart = $timeend = 0;
1693 }
1694
1695 if ($role = get_default_course_role($course)) {
c4381ef5 1696
1697 $context = get_context_instance(CONTEXT_COURSE, $course->id);
1698
e2183037 1699 if (!role_assign($role->id, $user->id, 0, $context->id, $timestart, $timeend, 0, $enrol)) {
b963384f 1700 return false;
1701 }
eef868d1 1702
b963384f 1703 email_welcome_message_to_user($course, $user);
eef868d1 1704
b963384f 1705 add_to_log($course->id, 'course', 'enrol', 'view.php?id='.$course->id, $user->id);
1706
1707 return true;
1708 }
1709
1710 return false;
1711}
1712
0f161e1f 1713/**
1714 * Add last access times to user_lastaccess as required
1715 * @param $userid
1716 * @param $context
1717 * @return boolean - success or failure
1718 */
1719function role_add_lastaccess_entries($userid, $context) {
1720
1721 global $USER, $CFG;
1722
aad2ba95 1723 if (empty($context->contextlevel)) {
0f161e1f 1724 return false;
1725 }
1726
1727 $lastaccess = new object; // Reusable object below
1728 $lastaccess->userid = $userid;
1729 $lastaccess->timeaccess = 0;
1730
aad2ba95 1731 switch ($context->contextlevel) {
0f161e1f 1732
1733 case CONTEXT_SYSTEM: // For the whole site
1734 if ($courses = get_record('course')) {
1735 foreach ($courses as $course) {
1736 $lastaccess->courseid = $course->id;
1737 role_set_lastaccess($lastaccess);
1738 }
1739 }
1740 break;
1741
1742 case CONTEXT_CATEGORY: // For a whole category
1743 if ($courses = get_record('course', 'category', $context->instanceid)) {
1744 foreach ($courses as $course) {
1745 $lastaccess->courseid = $course->id;
1746 role_set_lastaccess($lastaccess);
1747 }
1748 }
1749 if ($categories = get_record('course_categories', 'parent', $context->instanceid)) {
1750 foreach ($categories as $category) {
1751 $subcontext = get_context_instance(CONTEXT_CATEGORY, $category->id);
1752 role_add_lastaccess_entries($userid, $subcontext);
1753 }
1754 }
1755 break;
eef868d1 1756
0f161e1f 1757
1758 case CONTEXT_COURSE: // For a whole course
1759 if ($course = get_record('course', 'id', $context->instanceid)) {
1760 $lastaccess->courseid = $course->id;
1761 role_set_lastaccess($lastaccess);
1762 }
1763 break;
1764 }
1765}
1766
1767/**
1768 * Delete last access times from user_lastaccess as required
1769 * @param $userid
1770 * @param $context
1771 * @return boolean - success or failure
1772 */
1773function role_remove_lastaccess_entries($userid, $context) {
1774
1775 global $USER, $CFG;
1776
1777}
1778
bbbf2d40 1779
1780/**
1781 * Loads the capability definitions for the component (from file). If no
1782 * capabilities are defined for the component, we simply return an empty array.
1783 * @param $component - examples: 'moodle', 'mod/forum', 'block/quiz_results'
1784 * @return array of capabilities
1785 */
1786function load_capability_def($component) {
1787 global $CFG;
1788
1789 if ($component == 'moodle') {
1790 $defpath = $CFG->libdir.'/db/access.php';
1791 $varprefix = 'moodle';
1792 } else {
0c4d9f49 1793 $compparts = explode('/', $component);
eef868d1 1794
0c4d9f49 1795 if ($compparts[0] == 'block') {
1796 // Blocks are an exception. Blocks directory is 'blocks', and not
1797 // 'block'. So we need to jump through hoops.
1798 $defpath = $CFG->dirroot.'/'.$compparts[0].
1799 's/'.$compparts[1].'/db/access.php';
1800 $varprefix = $compparts[0].'_'.$compparts[1];
1801 } else {
1802 $defpath = $CFG->dirroot.'/'.$component.'/db/access.php';
1803 $varprefix = str_replace('/', '_', $component);
1804 }
bbbf2d40 1805 }
1806 $capabilities = array();
eef868d1 1807
bbbf2d40 1808 if (file_exists($defpath)) {
1809 require_once($defpath);
1810 $capabilities = ${$varprefix.'_capabilities'};
1811 }
1812 return $capabilities;
1813}
1814
1815
1816/**
1817 * Gets the capabilities that have been cached in the database for this
1818 * component.
1819 * @param $component - examples: 'moodle', 'mod/forum', 'block/quiz_results'
1820 * @return array of capabilities
1821 */
1822function get_cached_capabilities($component='moodle') {
1823 if ($component == 'moodle') {
1824 $storedcaps = get_records_select('capabilities',
1825 "name LIKE 'moodle/%:%'");
1826 } else {
1827 $storedcaps = get_records_select('capabilities',
1828 "name LIKE '$component:%'");
1829 }
1830 return $storedcaps;
1831}
1832
1833
1834/**
1835 * Updates the capabilities table with the component capability definitions.
1836 * If no parameters are given, the function updates the core moodle
1837 * capabilities.
1838 *
1839 * Note that the absence of the db/access.php capabilities definition file
1840 * will cause any stored capabilities for the component to be removed from
eef868d1 1841 * the database.
bbbf2d40 1842 *
1843 * @param $component - examples: 'moodle', 'mod/forum', 'block/quiz_results'
1844 * @return boolean
1845 */
1846function update_capabilities($component='moodle') {
eef868d1 1847
bbbf2d40 1848 $storedcaps = array();
be4486da 1849
1850 $filecaps = load_capability_def($component);
bbbf2d40 1851 $cachedcaps = get_cached_capabilities($component);
1852 if ($cachedcaps) {
1853 foreach ($cachedcaps as $cachedcap) {
1854 array_push($storedcaps, $cachedcap->name);
be4486da 1855 // update risk bitmasks in existing capabilitites if needed
1856 if (array_key_exists($cachedcap->name, $filecaps)) {
1857 if (!array_key_exists('riskbitmask', $filecaps[$cachedcap->name])) {
2b531945 1858 $filecaps[$cachedcap->name]['riskbitmask'] = 0; // no risk if not specified
be4486da 1859 }
1860 if ($cachedcap->riskbitmask != $filecaps[$cachedcap->name]['riskbitmask']) {
1861 $updatecap = new object;
1862 $updatecap->id = $cachedcap->id;
1863 $updatecap->riskbitmask = $filecaps[$cachedcap->name]['riskbitmask'];
1864 if (!update_record('capabilities', $updatecap)) {
1865 return false;
1866 }
1867 }
1868 }
bbbf2d40 1869 }
1870 }
be4486da 1871
bbbf2d40 1872 // Are there new capabilities in the file definition?
1873 $newcaps = array();
eef868d1 1874
bbbf2d40 1875 foreach ($filecaps as $filecap => $def) {
eef868d1 1876 if (!$storedcaps ||
bbbf2d40 1877 ($storedcaps && in_array($filecap, $storedcaps) === false)) {
2b531945 1878 if (!array_key_exists('riskbitmask', $def)) {
1879 $def['riskbitmask'] = 0; // no risk if not specified
1880 }
bbbf2d40 1881 $newcaps[$filecap] = $def;
1882 }
1883 }
1884 // Add new capabilities to the stored definition.
1885 foreach ($newcaps as $capname => $capdef) {
1886 $capability = new object;
1887 $capability->name = $capname;
1888 $capability->captype = $capdef['captype'];
1889 $capability->contextlevel = $capdef['contextlevel'];
1890 $capability->component = $component;
be4486da 1891 $capability->riskbitmask = $capdef['riskbitmask'];
eef868d1 1892
bbbf2d40 1893 if (!insert_record('capabilities', $capability, false, 'id')) {
1894 return false;
1895 }
eef868d1 1896
bbbf2d40 1897 // Do we need to assign the new capabilities to roles that have the
1898 // legacy capabilities moodle/legacy:* as well?
1899 if (isset($capdef['legacy']) && is_array($capdef['legacy']) &&
1900 !assign_legacy_capabilities($capname, $capdef['legacy'])) {
2e85fffe 1901 notify('Could not assign legacy capabilities for '.$capname);
bbbf2d40 1902 }
1903 }
1904 // Are there any capabilities that have been removed from the file
1905 // definition that we need to delete from the stored capabilities and
1906 // role assignments?
1907 capabilities_cleanup($component, $filecaps);
eef868d1 1908
bbbf2d40 1909 return true;
1910}
1911
1912
1913/**
1914 * Deletes cached capabilities that are no longer needed by the component.
1915 * Also unassigns these capabilities from any roles that have them.
1916 * @param $component - examples: 'moodle', 'mod/forum', 'block/quiz_results'
1917 * @param $newcapdef - array of the new capability definitions that will be
1918 * compared with the cached capabilities
1919 * @return int - number of deprecated capabilities that have been removed
1920 */
1921function capabilities_cleanup($component, $newcapdef=NULL) {
eef868d1 1922
bbbf2d40 1923 $removedcount = 0;
eef868d1 1924
bbbf2d40 1925 if ($cachedcaps = get_cached_capabilities($component)) {
1926 foreach ($cachedcaps as $cachedcap) {
1927 if (empty($newcapdef) ||
1928 array_key_exists($cachedcap->name, $newcapdef) === false) {
eef868d1 1929
bbbf2d40 1930 // Remove from capabilities cache.
1931 if (!delete_records('capabilities', 'name', $cachedcap->name)) {
1932 error('Could not delete deprecated capability '.$cachedcap->name);
1933 } else {
1934 $removedcount++;
1935 }
1936 // Delete from roles.
1937 if($roles = get_roles_with_capability($cachedcap->name)) {
1938 foreach($roles as $role) {
46943f7b 1939 if (!unassign_capability($cachedcap->name, $role->id)) {
bbbf2d40 1940 error('Could not unassign deprecated capability '.
1941 $cachedcap->name.' from role '.$role->name);
1942 }
1943 }
1944 }
1945 } // End if.
1946 }
1947 }
1948 return $removedcount;
1949}
1950
1951
1952
cee0901c 1953/****************
1954 * UI FUNCTIONS *
1955 ****************/
bbbf2d40 1956
1957
1958/**
1959 * prints human readable context identifier.
1960 */
0468976c 1961function print_context_name($context) {
340ea4e8 1962
ec0810ee 1963 $name = '';
aad2ba95 1964 switch ($context->contextlevel) {
ec0810ee 1965
bbbf2d40 1966 case CONTEXT_SYSTEM: // by now it's a definite an inherit
ec0810ee 1967 $name = get_string('site');
340ea4e8 1968 break;
bbbf2d40 1969
1970 case CONTEXT_PERSONAL:
ec0810ee 1971 $name = get_string('personal');
340ea4e8 1972 break;
1973
4b10f08b 1974 case CONTEXT_USER:
ec0810ee 1975 if ($user = get_record('user', 'id', $context->instanceid)) {
1976 $name = get_string('user').': '.fullname($user);
1977 }
340ea4e8 1978 break;
1979
bbbf2d40 1980 case CONTEXT_COURSECAT: // Coursecat -> coursecat or site
ec0810ee 1981 if ($category = get_record('course_categories', 'id', $context->instanceid)) {
1982 $name = get_string('category').': '.$category->name;
1983 }
340ea4e8 1984 break;
bbbf2d40 1985
1986 case CONTEXT_COURSE: // 1 to 1 to course cat
ec0810ee 1987 if ($course = get_record('course', 'id', $context->instanceid)) {
1988 $name = get_string('course').': '.$course->fullname;
1989 }
340ea4e8 1990 break;
bbbf2d40 1991
1992 case CONTEXT_GROUP: // 1 to 1 to course
ec0810ee 1993 if ($group = get_record('groups', 'id', $context->instanceid)) {
1994 $name = get_string('group').': '.$group->name;
1995 }
340ea4e8 1996 break;
bbbf2d40 1997
1998 case CONTEXT_MODULE: // 1 to 1 to course
98882637 1999 if ($cm = get_record('course_modules','id',$context->instanceid)) {
2000 if ($module = get_record('modules','id',$cm->module)) {
2001 if ($mod = get_record($module->name, 'id', $cm->instance)) {
ec0810ee 2002 $name = get_string('activitymodule').': '.$mod->name;
98882637 2003 }
ec0810ee 2004 }
2005 }
340ea4e8 2006 break;
bbbf2d40 2007
2008 case CONTEXT_BLOCK: // 1 to 1 to course
98882637 2009 if ($blockinstance = get_record('block_instance','id',$context->instanceid)) {
2010 if ($block = get_record('block','id',$blockinstance->blockid)) {
91be52d7 2011 global $CFG;
2012 require_once("$CFG->dirroot/blocks/moodleblock.class.php");
2013 require_once("$CFG->dirroot/blocks/$block->name/block_$block->name.php");
2014 $blockname = "block_$block->name";
2015 if ($blockobject = new $blockname()) {
2016 $name = $blockobject->title.' ('.get_string('block').')';
2017 }
ec0810ee 2018 }
2019 }
340ea4e8 2020 break;
bbbf2d40 2021
2022 default:
2023 error ('This is an unknown context!');
340ea4e8 2024 return false;
2025
2026 }
340ea4e8 2027 return $name;
bbbf2d40 2028}
2029
2030
2031/**
eef868d1 2032 * Extracts the relevant capabilities given a contextid.
bbbf2d40 2033 * All case based, example an instance of forum context.
2034 * Will fetch all forum related capabilities, while course contexts
2035 * Will fetch all capabilities
0468976c 2036 * @param object context
bbbf2d40 2037 * @return array();
2038 *
2039 * capabilities
2040 * `name` varchar(150) NOT NULL,
2041 * `captype` varchar(50) NOT NULL,
2042 * `contextlevel` int(10) NOT NULL,
2043 * `component` varchar(100) NOT NULL,
2044 */
0468976c 2045function fetch_context_capabilities($context) {
eef868d1 2046
98882637 2047 global $CFG;
bbbf2d40 2048
2049 $sort = 'ORDER BY contextlevel,component,id'; // To group them sensibly for display
eef868d1 2050
aad2ba95 2051 switch ($context->contextlevel) {
bbbf2d40 2052
98882637 2053 case CONTEXT_SYSTEM: // all
2054 $SQL = "select * from {$CFG->prefix}capabilities";
bbbf2d40 2055 break;
2056
2057 case CONTEXT_PERSONAL:
0a8a95c9 2058 $SQL = "select * from {$CFG->prefix}capabilities where contextlevel = ".CONTEXT_PERSONAL;
bbbf2d40 2059 break;
eef868d1 2060
4b10f08b 2061 case CONTEXT_USER:
2062 $SQL = "select * from {$CFG->prefix}capabilities where contextlevel = ".CONTEXT_USER;
bbbf2d40 2063 break;
eef868d1 2064
bbbf2d40 2065 case CONTEXT_COURSECAT: // all
98882637 2066 $SQL = "select * from {$CFG->prefix}capabilities";
bbbf2d40 2067 break;
2068
2069 case CONTEXT_COURSE: // all
98882637 2070 $SQL = "select * from {$CFG->prefix}capabilities";
bbbf2d40 2071 break;
2072
2073 case CONTEXT_GROUP: // group caps
2074 break;
2075
2076 case CONTEXT_MODULE: // mod caps
98882637 2077 $cm = get_record('course_modules', 'id', $context->instanceid);
2078 $module = get_record('modules', 'id', $cm->module);
eef868d1 2079
98882637 2080 $SQL = "select * from {$CFG->prefix}capabilities where contextlevel = ".CONTEXT_MODULE."
2081 and component = 'mod/$module->name'";
bbbf2d40 2082 break;
2083
2084 case CONTEXT_BLOCK: // block caps
98882637 2085 $cb = get_record('block_instance', 'id', $context->instanceid);
2086 $block = get_record('block', 'id', $cb->blockid);
eef868d1 2087
98882637 2088 $SQL = "select * from {$CFG->prefix}capabilities where contextlevel = ".CONTEXT_BLOCK."
2089 and component = 'block/$block->name'";
bbbf2d40 2090 break;
2091
2092 default:
2093 return false;
2094 }
2095
16e2e2f3 2096 if (!$records = get_records_sql($SQL.' '.$sort)) {
2097 $records = array();
2098 }
759ac72d 2099 $contextindependentcaps = fetch_context_independent_capabilities();
2100 $records = array_merge($records, $contextindependentcaps);
69eb59f2 2101
2102 // special sorting of core system capabiltites and enrollments
aad2ba95 2103 if ($context->contextlevel == CONTEXT_SYSTEM) {
69eb59f2 2104 $first = array();
2105 foreach ($records as $key=>$record) {
2106 if (preg_match('|^moodle/|', $record->name) and $record->contextlevel == CONTEXT_SYSTEM) {
2107 $first[$key] = $record;
2108 unset($records[$key]);
2109 } else if (count($first)){
2110 break;
2111 }
2112 }
2113 if (count($first)) {
2114 $records = $first + $records; // merge the two arrays keeping the keys
2115 }
2116 }
2117 // end of special sorting
bbbf2d40 2118 return $records;
eef868d1 2119
bbbf2d40 2120}
2121
2122
759ac72d 2123/**
2124 * Gets the context-independent capabilities that should be overrridable in
2125 * any context.
2126 * @return array of capability records from the capabilities table.
2127 */
2128function fetch_context_independent_capabilities() {
eef868d1 2129
759ac72d 2130 $contextindependentcaps = array(
2131 'moodle/site:accessallgroups'
2132 );
2133
2134 $records = array();
eef868d1 2135
759ac72d 2136 foreach ($contextindependentcaps as $capname) {
2137 $record = get_record('capabilities', 'name', $capname);
2138 array_push($records, $record);
2139 }
2140 return $records;
2141}
2142
2143
bbbf2d40 2144/**
2145 * This function pulls out all the resolved capabilities (overrides and
759ac72d 2146 * defaults) of a role used in capability overrides in contexts at a given
bbbf2d40 2147 * context.
0a8a95c9 2148 * @param obj $context
bbbf2d40 2149 * @param int $roleid
dc558690 2150 * @param bool self - if set to true, resolve till this level, else stop at immediate parent level
bbbf2d40 2151 * @return array
2152 */
1648afb2 2153function role_context_capabilities($roleid, $context, $cap='') {
dc558690 2154 global $CFG;
eef868d1 2155
8521d83a 2156 $contexts = get_parent_contexts($context);
2157 $contexts[] = $context->id;
98882637 2158 $contexts = '('.implode(',', $contexts).')';
eef868d1 2159
1648afb2 2160 if ($cap) {
e4697bf7 2161 $search = " AND rc.capability = '$cap' ";
1648afb2 2162 } else {
eef868d1 2163 $search = '';
1648afb2 2164 }
eef868d1 2165
2166 $SQL = "SELECT rc.*
2167 FROM {$CFG->prefix}role_capabilities rc,
dc558690 2168 {$CFG->prefix}context c
2169 WHERE rc.contextid in $contexts
2170 AND rc.roleid = $roleid
2171 AND rc.contextid = c.id $search
aad2ba95 2172 ORDER BY c.contextlevel DESC,
eef868d1 2173 rc.capability DESC";
759ac72d 2174
98882637 2175 $capabilities = array();
eef868d1 2176
4729012f 2177 if ($records = get_records_sql($SQL)) {
2178 // We are traversing via reverse order.
2179 foreach ($records as $record) {
2180 // If not set yet (i.e. inherit or not set at all), or currently we have a prohibit
2181 if (!isset($capabilities[$record->capability]) || $record->permission<-500) {
2182 $capabilities[$record->capability] = $record->permission;
eef868d1 2183 }
4729012f 2184 }
98882637 2185 }
2186 return $capabilities;
bbbf2d40 2187}
2188
bbbf2d40 2189/**
eef868d1 2190 * Recursive function which, given a context, find all parent context ids,
bbbf2d40 2191 * and return the array in reverse order, i.e. parent first, then grand
2192 * parent, etc.
2193 * @param object $context
2194 * @return array()
2195 */
bbbf2d40 2196function get_parent_contexts($context) {
759ac72d 2197
aad2ba95 2198 switch ($context->contextlevel) {
bbbf2d40 2199
2200 case CONTEXT_SYSTEM: // no parent
957861f7 2201 return array();
bbbf2d40 2202 break;
2203
2204 case CONTEXT_PERSONAL:
957861f7 2205 if (!$parent = get_context_instance(CONTEXT_SYSTEM, SITEID)) {
2206 return array();
2207 } else {
2208 return array($parent->id);
2209 }
bbbf2d40 2210 break;
eef868d1 2211
4b10f08b 2212 case CONTEXT_USER:
957861f7 2213 if (!$parent = get_context_instance(CONTEXT_SYSTEM, SITEID)) {
2214 return array();
2215 } else {
2216 return array($parent->id);
2217 }
bbbf2d40 2218 break;
eef868d1 2219
bbbf2d40 2220 case CONTEXT_COURSECAT: // Coursecat -> coursecat or site
957861f7 2221 if (!$coursecat = get_record('course_categories','id',$context->instanceid)) {
2222 return array();
2223 }
c5ddc3fd 2224 if (!empty($coursecat->parent)) { // return parent value if exist
bbbf2d40 2225 $parent = get_context_instance(CONTEXT_COURSECAT, $coursecat->parent);
2226 return array_merge(array($parent->id), get_parent_contexts($parent));
2227 } else { // else return site value
2228 $parent = get_context_instance(CONTEXT_SYSTEM, SITEID);
2229 return array($parent->id);
2230 }
2231 break;
2232
2233 case CONTEXT_COURSE: // 1 to 1 to course cat
957861f7 2234 if (!$course = get_record('course','id',$context->instanceid)) {
2235 return array();
2236 }
2237 if (!empty($course->category)) {
2238 $parent = get_context_instance(CONTEXT_COURSECAT, $course->category);
2239 return array_merge(array($parent->id), get_parent_contexts($parent));
2240 } else {
2241 return array();
2242 }
bbbf2d40 2243 break;
2244
2245 case CONTEXT_GROUP: // 1 to 1 to course
957861f7 2246 if (!$group = get_record('groups','id',$context->instanceid)) {
2247 return array();
2248 }
2249 if ($parent = get_context_instance(CONTEXT_COURSE, $group->courseid)) {
2250 return array_merge(array($parent->id), get_parent_contexts($parent));
2251 } else {
2252 return array();
2253 }
bbbf2d40 2254 break;
2255
2256 case CONTEXT_MODULE: // 1 to 1 to course
957861f7 2257 if (!$cm = get_record('course_modules','id',$context->instanceid)) {
2258 return array();
2259 }
2260 if ($parent = get_context_instance(CONTEXT_COURSE, $cm->course)) {
2261 return array_merge(array($parent->id), get_parent_contexts($parent));
2262 } else {
2263 return array();
2264 }
bbbf2d40 2265 break;
2266
2267 case CONTEXT_BLOCK: // 1 to 1 to course
957861f7 2268 if (!$block = get_record('block_instance','id',$context->instanceid)) {
2269 return array();
2270 }
2271 if ($parent = get_context_instance(CONTEXT_COURSE, $block->pageid)) {
2272 return array_merge(array($parent->id), get_parent_contexts($parent));
2273 } else {
2274 return array();
2275 }
bbbf2d40 2276 break;
2277
2278 default:
957861f7 2279 error('This is an unknown context!');
bbbf2d40 2280 return false;
2281 }
bbbf2d40 2282}
2283
759ac72d 2284
2285/**
2286 * Gets a string for sql calls, searching for stuff in this context or above
ea8158c1 2287 * @param object $context
2288 * @return string
2289 */
2290function get_related_contexts_string($context) {
2291 if ($parents = get_parent_contexts($context)) {
eef868d1 2292 return (' IN ('.$context->id.','.implode(',', $parents).')');
ea8158c1 2293 } else {
2294 return (' ='.$context->id);
2295 }
2296}
759ac72d 2297
2298
bbbf2d40 2299/**
2300 * This function gets the capability of a role in a given context.
2301 * It is needed when printing override forms.
2302 * @param int $contextid
bbbf2d40 2303 * @param string $capability
2304 * @param array $capabilities - array loaded using role_context_capabilities
2305 * @return int (allow, prevent, prohibit, inherit)
2306 */
bbbf2d40 2307function get_role_context_capability($contextid, $capability, $capabilities) {
759ac72d 2308 if (isset($capabilities[$contextid][$capability])) {
2309 return $capabilities[$contextid][$capability];
2310 }
2311 else {
2312 return false;
2313 }
bbbf2d40 2314}
2315
2316
cee0901c 2317/**
2318 * Returns the human-readable, translated version of the capability.
2319 * Basically a big switch statement.
2320 * @param $capabilityname - e.g. mod/choice:readresponses
2321 */
ceb83c70 2322function get_capability_string($capabilityname) {
eef868d1 2323
cee0901c 2324 // Typical capabilityname is mod/choice:readresponses
ceb83c70 2325
2326 $names = split('/', $capabilityname);
2327 $stringname = $names[1]; // choice:readresponses
eef868d1 2328 $components = split(':', $stringname);
ceb83c70 2329 $componentname = $components[0]; // choice
98882637 2330
2331 switch ($names[0]) {
2332 case 'mod':
ceb83c70 2333 $string = get_string($stringname, $componentname);
98882637 2334 break;
eef868d1 2335
98882637 2336 case 'block':
ceb83c70 2337 $string = get_string($stringname, 'block_'.$componentname);
98882637 2338 break;
ceb83c70 2339
98882637 2340 case 'moodle':
ceb83c70 2341 $string = get_string($stringname, 'role');
98882637 2342 break;
eef868d1 2343
98882637 2344 case 'enrol':
ceb83c70 2345 $string = get_string($stringname, 'enrol_'.$componentname);
eef868d1 2346 break;
2347
98882637 2348 default:
ceb83c70 2349 $string = get_string($stringname);
eef868d1 2350 break;
2351
98882637 2352 }
ceb83c70 2353 return $string;
bbbf2d40 2354}
2355
2356
cee0901c 2357/**
2358 * This gets the mod/block/course/core etc strings.
2359 * @param $component
2360 * @param $contextlevel
2361 */
bbbf2d40 2362function get_component_string($component, $contextlevel) {
2363
98882637 2364 switch ($contextlevel) {
bbbf2d40 2365
98882637 2366 case CONTEXT_SYSTEM:
be382aaf 2367 if (preg_match('|^enrol/|', $component)) {
2368 $langname = str_replace('/', '_', $component);
2369 $string = get_string('enrolname', $langname);
f3652521 2370 } else if (preg_match('|^block/|', $component)) {
2371 $langname = str_replace('/', '_', $component);
2372 $string = get_string('blockname', $langname);
69eb59f2 2373 } else {
2374 $string = get_string('coresystem');
2375 }
bbbf2d40 2376 break;
2377
2378 case CONTEXT_PERSONAL:
98882637 2379 $string = get_string('personal');
bbbf2d40 2380 break;
2381
4b10f08b 2382 case CONTEXT_USER:
98882637 2383 $string = get_string('users');
bbbf2d40 2384 break;
2385
2386 case CONTEXT_COURSECAT:
98882637 2387 $string = get_string('categories');
bbbf2d40 2388 break;
2389
2390 case CONTEXT_COURSE:
98882637 2391 $string = get_string('course');
bbbf2d40 2392 break;
2393
2394 case CONTEXT_GROUP:
98882637 2395 $string = get_string('group');
bbbf2d40 2396 break;
2397
2398 case CONTEXT_MODULE:
98882637 2399 $string = get_string('modulename', basename($component));
bbbf2d40 2400 break;
2401
2402 case CONTEXT_BLOCK:
98882637 2403 $string = get_string('blockname', 'block_'.$component.'.php');
bbbf2d40 2404 break;
2405
2406 default:
2407 error ('This is an unknown context!');
2408 return false;
eef868d1 2409
98882637 2410 }
98882637 2411 return $string;
bbbf2d40 2412}
cee0901c 2413
759ac72d 2414/**
2415 * Gets the list of roles assigned to this context and up (parents)
945f88ca 2416 * @param object $context
2417 * @return array
2418 */
e4dd3222 2419function get_roles_used_in_context($context) {
2420
2421 global $CFG;
2d9965e1 2422 $contextlist = get_related_contexts_string($context);
eef868d1 2423
759ac72d 2424 $sql = "SELECT DISTINCT r.id,
2425 r.name,
2426 r.shortname,
2427 r.sortorder
2428 FROM {$CFG->prefix}role_assignments ra,
eef868d1 2429 {$CFG->prefix}role r
2430 WHERE r.id = ra.roleid
759ac72d 2431 AND ra.contextid $contextlist
2432 ORDER BY r.sortorder ASC";
eef868d1 2433
759ac72d 2434 return get_records_sql($sql);
e4dd3222 2435}
2436
eef868d1 2437/** this function is used to print roles column in user profile page.
945f88ca 2438 * @param int userid
2439 * @param int contextid
2440 * @return string
2441 */
0a8a95c9 2442function get_user_roles_in_context($userid, $contextid){
2443 global $CFG;
eef868d1 2444
0a8a95c9 2445 $rolestring = '';
2446 $SQL = 'select * from '.$CFG->prefix.'role_assignments ra, '.$CFG->prefix.'role r where ra.userid='.$userid.' and ra.contextid='.$contextid.' and ra.roleid = r.id';
2447 if ($roles = get_records_sql($SQL)) {
2448 foreach ($roles as $userrole) {
2449 $rolestring .= '<a href="'.$CFG->wwwroot.'/user/index.php?contextid='.$userrole->contextid.'&amp;roleid='.$userrole->roleid.'">'.$userrole->name.'</a>, ';
eef868d1 2450 }
2451
0a8a95c9 2452 }
2453 return rtrim($rolestring, ', ');
2454}
68c52526 2455
2456
945f88ca 2457/**
2458 * Checks if a user can override capabilities of a particular role in this context
2459 * @param object $context
2460 * @param int targetroleid - the id of the role you want to override
2461 * @return boolean
2462 */
68c52526 2463function user_can_override($context, $targetroleid) {
2464 // first check if user has override capability
2465 // if not return false;
2466 if (!has_capability('moodle/role:override', $context)) {
eef868d1 2467 return false;
68c52526 2468 }
2469 // pull out all active roles of this user from this context(or above)
c0614051 2470 if ($userroles = get_user_roles($context)) {
2471 foreach ($userroles as $userrole) {
2472 // if any in the role_allow_override table, then it's ok
2473 if (get_record('role_allow_override', 'roleid', $userrole->roleid, 'allowoverride', $targetroleid)) {
2474 return true;
2475 }
68c52526 2476 }
2477 }
eef868d1 2478
68c52526 2479 return false;
eef868d1 2480
68c52526 2481}
2482
945f88ca 2483/**
2484 * Checks if a user can assign users to a particular role in this context
2485 * @param object $context
2486 * @param int targetroleid - the id of the role you want to assign users to
2487 * @return boolean
2488 */
68c52526 2489function user_can_assign($context, $targetroleid) {
eef868d1 2490
68c52526 2491 // first check if user has override capability
2492 // if not return false;
2493 if (!has_capability('moodle/role:assign', $context)) {
eef868d1 2494 return false;
68c52526 2495 }
2496 // pull out all active roles of this user from this context(or above)
c0614051 2497 if ($userroles = get_user_roles($context)) {
2498 foreach ($userroles as $userrole) {
2499 // if any in the role_allow_override table, then it's ok
2500 if (get_record('role_allow_assign', 'roleid', $userrole->roleid, 'allowassign', $targetroleid)) {
2501 return true;
2502 }
68c52526 2503 }
2504 }
eef868d1 2505
2506 return false;
68c52526 2507}
2508
ece4945b 2509/** Returns all site roles in correct sort order.
2510 *
2511 */
2512function get_all_roles() {
2513 return get_records('role', '', '', 'sortorder ASC');
2514}
2515
945f88ca 2516/**
2517 * gets all the user roles assigned in this context, or higher contexts
2518 * this is mainly used when checking if a user can assign a role, or overriding a role
2519 * i.e. we need to know what this user holds, in order to verify against allow_assign and
2520 * allow_override tables
2521 * @param object $context
2522 * @param int $userid
2523 * @return array
2524 */
5b630667 2525function get_user_roles($context, $userid=0, $checkparentcontexts=true) {
68c52526 2526
2527 global $USER, $CFG, $db;
c0614051 2528
2529 if (empty($userid)) {
2530 if (empty($USER->id)) {
2531 return array();
2532 }
2533 $userid = $USER->id;
2534 }
2535
5b630667 2536 if ($checkparentcontexts && ($parents = get_parent_contexts($context))) {
2537 $contexts = ' ra.contextid IN ('.implode(',' , $parents).','.$context->id.')';
c0614051 2538 } else {
5b630667 2539 $contexts = ' ra.contextid = \''.$context->id.'\'';
c0614051 2540 }
2541
31f26796 2542 return get_records_sql('SELECT ra.*, r.name, r.shortname
5b630667 2543 FROM '.$CFG->prefix.'role_assignments ra,
ec6eb110 2544 '.$CFG->prefix.'role r,
2545 '.$CFG->prefix.'context c
c0614051 2546 WHERE ra.userid = '.$userid.
5b630667 2547 ' AND ra.roleid = r.id
ec6eb110 2548 AND ra.contextid = c.id
eef868d1 2549 AND '.$contexts.
ece4945b 2550 ' ORDER BY c.contextlevel DESC, r.sortorder ASC');
68c52526 2551}
2552
945f88ca 2553/**
eef868d1 2554 * Creates a record in the allow_override table
945f88ca 2555 * @param int sroleid - source roleid
2556 * @param int troleid - target roleid
2557 * @return int - id or false
2558 */
2559function allow_override($sroleid, $troleid) {
ece4945b 2560 $record = new object();
945f88ca 2561 $record->roleid = $sroleid;
2562 $record->allowoverride = $troleid;
2563 return insert_record('role_allow_override', $record);
2564}
2565
2566/**
eef868d1 2567 * Creates a record in the allow_assign table
945f88ca 2568 * @param int sroleid - source roleid
2569 * @param int troleid - target roleid
2570 * @return int - id or false
2571 */
2572function allow_assign($sroleid, $troleid) {
ff64aaea 2573 $record = new object;
945f88ca 2574 $record->roleid = $sroleid;
2575 $record->allowassign = $troleid;
2576 return insert_record('role_allow_assign', $record);
2577}
2578
2579/**
ff64aaea 2580 * Gets a list of roles that this user can assign in this context
945f88ca 2581 * @param object $context
2582 * @return array
2583 */
2584function get_assignable_roles ($context) {
2585
945f88ca 2586 $options = array();
ff64aaea 2587
ece4945b 2588 if ($roles = get_all_roles()) {
ff64aaea 2589 foreach ($roles as $role) {
2590 if (user_can_assign($context, $role->id)) {
65b0c132 2591 $options[$role->id] = strip_tags(format_string($role->name, true));
ff64aaea 2592 }
945f88ca 2593 }
2594 }
2595 return $options;
2596}
2597
2598/**
ff64aaea 2599 * Gets a list of roles that this user can override in this context
945f88ca 2600 * @param object $context
2601 * @return array
2602 */
2603function get_overridable_roles ($context) {
2604
945f88ca 2605 $options = array();
ff64aaea 2606
ece4945b 2607 if ($roles = get_all_roles()) {
ff64aaea 2608 foreach ($roles as $role) {
2609 if (user_can_override($context, $role->id)) {
65b0c132 2610 $options[$role->id] = strip_tags(format_string($role->name, true));
ff64aaea 2611 }
945f88ca 2612 }
ff64aaea 2613 }
eef868d1 2614
2615 return $options;
945f88ca 2616}
1648afb2 2617
b963384f 2618/*
2619 * Returns a role object that is the default role for new enrolments
2620 * in a given course
2621 *
eef868d1 2622 * @param object $course
b963384f 2623 * @return object $role
2624 */
2625function get_default_course_role($course) {
2626 global $CFG;
2627
2628/// First let's take the default role the course may have
2629 if (!empty($course->defaultrole)) {
2630 if ($role = get_record('role', 'id', $course->defaultrole)) {
2631 return $role;
2632 }
2633 }
2634
2635/// Otherwise the site setting should tell us
2636 if ($CFG->defaultcourseroleid) {
2637 if ($role = get_record('role', 'id', $CFG->defaultcourseroleid)) {
2638 return $role;
2639 }
2640 }
2641
2642/// It's unlikely we'll get here, but just in case, try and find a student role
2643 if ($studentroles = get_roles_with_capability('moodle/legacy:student', CAP_ALLOW)) {
2644 return array_shift($studentroles); /// Take the first one
2645 }
2646
2647 return NULL;
2648}
2649
1648afb2 2650
2651/**
2652 * who has this capability in this context
2653 * does not handling user level resolving!!!
2654 * i.e 1 person has 2 roles 1 allow, 1 prevent, this will not work properly
2655 * @param $context - object
2656 * @param $capability - string capability
2657 * @param $fields - fields to be pulled
2658 * @param $sort - the sort order
04417640 2659 * @param $limitfrom - number of records to skip (offset)
eef868d1 2660 * @param $limitnum - number of records to fetch
1c45e42e 2661 * @param $groups - single group or array of groups - group(s) user is in
71dea306 2662 * @param $exceptions - list of users to exclude
1648afb2 2663 */
eef868d1 2664function get_users_by_capability($context, $capability, $fields='', $sort='',
1d546bb1 2665 $limitfrom='', $limitnum='', $groups='', $exceptions='', $doanything=true) {
1648afb2 2666 global $CFG;
eef868d1 2667
64026e8c 2668/// Sorting out groups
1c45e42e 2669 if ($groups) {
71dea306 2670 $groupjoin = 'INNER JOIN '.$CFG->prefix.'groups_members gm ON gm.userid = ra.userid';
eef868d1 2671
1c45e42e 2672 if (is_array($groups)) {
a05708ad 2673 $groupsql = 'AND gm.groupid IN ('.implode(',', $groups).')';
1c45e42e 2674 } else {
eef868d1 2675 $groupsql = 'AND gm.groupid = '.$groups;
1c45e42e 2676 }
2677 } else {
2678 $groupjoin = '';
eef868d1 2679 $groupsql = '';
1c45e42e 2680 }
eef868d1 2681
64026e8c 2682/// Sorting out exceptions
5081e786 2683 $exceptionsql = $exceptions ? "AND u.id NOT IN ($exceptions)" : '';
64026e8c 2684
2685/// Set up default fields
2686 if (empty($fields)) {
5b630667 2687 $fields = 'u.*, ul.timeaccess as lastaccess, ra.hidden';
64026e8c 2688 }
2689
2690/// Set up default sort
2691 if (empty($sort)) {
2692 $sort = 'ul.timeaccess';
2693 }
2694
eef868d1 2695 $sortby = $sort ? " ORDER BY $sort " : '';
2696
64026e8c 2697/// If context is a course, then construct sql for ul
aad2ba95 2698 if ($context->contextlevel == CONTEXT_COURSE) {
71dea306 2699 $courseid = $context->instanceid;
f00b7f8d 2700 $coursesql = "AND (ul.courseid = $courseid OR ul.courseid IS NULL)";
5081e786 2701 } else {
2702 $coursesql = '';
71dea306 2703 }
64026e8c 2704
2705/// Sorting out roles with this capability set
9d829c68 2706 if ($possibleroles = get_roles_with_capability($capability, CAP_ALLOW, $context)) {
1d546bb1 2707 if (!$doanything) {
3ca2dea5 2708 if (!$sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID)) {
1d546bb1 2709 return false; // Something is seriously wrong
2710 }
2711 $doanythingroles = get_roles_with_capability('moodle/site:doanything', CAP_ALLOW, $sitecontext);
e836a7dd 2712 }
e836a7dd 2713
9d829c68 2714 $validroleids = array();
e836a7dd 2715 foreach ($possibleroles as $possiblerole) {
1d546bb1 2716 if (!$doanything) {
2717 if (isset($doanythingroles[$possiblerole->id])) { // We don't want these included
2718 continue;
2719 }
e836a7dd 2720 }
bccdf227 2721 if ($caps = role_context_capabilities($possiblerole->id, $context, $capability)) { // resolved list
2722 if (isset($caps[$capability]) && $caps[$capability] > 0) { // resolved capability > 0
2723 $validroleids[] = $possiblerole->id;
2724 }
9d829c68 2725 }
1648afb2 2726 }
1d546bb1 2727 if (empty($validroleids)) {
2728 return false;
2729 }
9d829c68 2730 $roleids = '('.implode(',', $validroleids).')';
2731 } else {
2732 return false; // No need to continue, since no roles have this capability set
eef868d1 2733 }
64026e8c 2734
2735/// Construct the main SQL
71dea306 2736 $select = " SELECT $fields";
eef868d1 2737 $from = " FROM {$CFG->prefix}user u
2738 INNER JOIN {$CFG->prefix}role_assignments ra ON ra.userid = u.id
0a3e9703 2739 INNER JOIN {$CFG->prefix}role r ON r.id = ra.roleid
71dea306 2740 LEFT OUTER JOIN {$CFG->prefix}user_lastaccess ul ON ul.userid = u.id
2741 $groupjoin";
eef868d1 2742 $where = " WHERE ra.contextid ".get_related_contexts_string($context)."
2743 AND u.deleted = 0
2744 AND ra.roleid in $roleids
71dea306 2745 $exceptionsql
2746 $coursesql
2747 $groupsql";
2748
eef868d1 2749 return get_records_sql($select.$from.$where.$sortby, $limitfrom, $limitnum);
1648afb2 2750}
7700027f 2751
ab5c9044 2752/**
2753 * gets all the users assigned this role in this context or higher
2754 * @param int roleid
2755 * @param int contextid
2756 * @param bool parent if true, get list of users assigned in higher context too
2757 * @return array()
2758 */
bac2f88a 2759function get_role_users($roleid, $context, $parent=false, $fields='u.*') {
ab5c9044 2760 global $CFG;
eef868d1 2761
ab5c9044 2762 if ($parent) {
2763 if ($contexts = get_parent_contexts($context)) {
2764 $parentcontexts = 'r.contextid IN ('.implode(',', $contexts).')';
2765 } else {
eef868d1 2766 $parentcontexts = '';
ab5c9044 2767 }
2768 } else {
eef868d1 2769 $parentcontexts = '';
2770 }
2771
bac2f88a 2772 $SQL = "select $fields
eef868d1 2773 from {$CFG->prefix}role_assignments r,
2774 {$CFG->prefix}user u
2775 where (r.contextid = $context->id $parentcontexts)
2776 and r.roleid = $roleid
ab5c9044 2777 and u.id = r.userid"; // join now so that we can just use fullname() later
eef868d1 2778
ab5c9044 2779 return get_records_sql($SQL);
2780}
2781
bac2f88a 2782/**
2783 * Counts all the users assigned this role in this context or higher
2784 * @param int roleid
2785 * @param int contextid
2786 * @param bool parent if true, get list of users assigned in higher context too
2787 * @return array()
2788 */
2789function count_role_users($roleid, $context, $parent=false) {
2790 global $CFG;
2791
2792 if ($parent) {
2793 if ($contexts = get_parent_contexts($context)) {
2794 $parentcontexts = 'r.contextid IN ('.implode(',', $contexts).')';
2795 } else {
2796 $parentcontexts = '';
2797 }
2798 } else {
2799 $parentcontexts = '';
2800 }
2801
2802 $SQL = "SELECT count(*)
2803 FROM {$CFG->prefix}role_assignments r
2804 WHERE (r.contextid = $context->id $parentcontexts)
2805 AND r.roleid = $roleid";
2806
2807 return count_records_sql($SQL);
2808}
2809
eef868d1 2810/**
d76a5a7f 2811 * This function gets the list of courses that this user has a particular capability in
2812 * This is not the most efficient way of doing this
2813 * @param string capability
2814 * @param int $userid
2815 * @return array
2816 */
2817function get_user_capability_course($capability, $userid='') {
eef868d1 2818
d76a5a7f 2819 global $USER;
2820 if (!$userid) {
eef868d1 2821 $userid = $USER->id;
d76a5a7f 2822 }
eef868d1 2823
d76a5a7f 2824 $usercourses = array();
2825 $courses = get_records_select('course', '', '', 'id, id');
eef868d1 2826
d76a5a7f 2827 foreach ($courses as $course) {
2828 if (has_capability($capability, get_context_capability(CONTEXT_COURSE, $course->id))) {
2829 $usercourses[] = $course;
2830 }
2831 }
eef868d1 2832 return $usercourses;
e38f38c3 2833}
2834
2835
2836/** This function finds the roles assigned directly to this context only
2837 * i.e. no parents role
2838 * @param object $context
2839 * @return array
2840 */
2841function get_roles_on_exact_context($context) {
b5959f30 2842
e38f38c3 2843 global $CFG;
49293027 2844
b5959f30 2845 return get_records_sql("SELECT DISTINCT r.*
e38f38c3 2846 FROM {$CFG->prefix}role_assignments ra,
2847 {$CFG->prefix}role r
2848 WHERE ra.roleid = r.id
2849 AND ra.contextid = $context->id");
b5959f30 2850
49293027 2851}
2852
b5959f30 2853/*
3a52e764 2854 * Switches the current user to another role for the current session and only
b5959f30 2855 * in the given context. If roleid is not valid (eg 0) or the current user
2856 * doesn't have permissions to be switching roles then the user's session
3a52e764 2857 * is compltely reset to have their normal roles.
2858 * @param integer $roleid
2859 * @param object $context
2860 * @return bool
2861 */
2862function role_switch($roleid, $context) {
2863 global $USER;
2864
2865 global $db;
2866
2867/// If we can't use this or are already using it or no role was specified then bail completely and reset
b5959f30 2868 if (empty($roleid) || !has_capability('moodle/role:switchroles', $context)
2d07587b 2869 || !empty($USER->switchrole[$context->id]) || !confirm_sesskey()) {
2870 load_user_capability('', $context); // Reset all permissions for this context to normal
2871 unset($USER->switchrole[$context->id]); // Delete old capabilities
3a52e764 2872 return true;
2873 }
2874
2875/// We're allowed to switch but can we switch to the specified role? Use assignable roles to check.
2876 if (!$roles = get_assignable_roles($context)) {
2877 return false;
2878 }
2879
2880 if (empty($roles[$roleid])) { /// We can't switch to this particular role
2881 return false;
2882 }
2883
2884 if (!$sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID)) {
2885 return false;
2886 }
2887
2888/// We have a valid roleid that this user can switch to, so let's set up the session
2889
2d07587b 2890 $USER->switchrole[$context->id] = $roleid; // So we know later what state we are in
3a52e764 2891
2892 unset($USER->capabilities[$context->id]); // Delete old capabilities
2893
2894 if ($capabilities = get_records_select('role_capabilities', "roleid = $roleid AND contextid = $sitecontext->id")) {
2895 foreach ($capabilities as $capability) {
2896 $USER->capabilities[$context->id][$capability->capability] = $capability->permission;
2897 }
2898 }
2899
2d07587b 2900/// Add some permissions we are really going to always need, even if the role doesn't have them!
3a52e764 2901
2902 $USER->capabilities[$context->id]['moodle/course:view'] = CAP_ALLOW;
2903
2904 return true;
2905
2906}
2907
2908
49293027 2909// get any role that has an override on exact context
2910function get_roles_with_override_on_context($context) {
b5959f30 2911
49293027 2912 global $CFG;
b5959f30 2913
49293027 2914 return get_records_sql("SELECT DISTINCT r.*
2915 FROM {$CFG->prefix}role_capabilities rc,
2916 {$CFG->prefix}role r
2917 WHERE rc.roleid = r.id
2918 AND rc.contextid = $context->id");
2919}
2920
2921// get all capabilities for this role on this context (overrids)
2922function get_capabilities_from_role_on_context($role, $context) {
b5959f30 2923
49293027 2924 global $CFG;
b5959f30 2925
2926 return get_records_sql("SELECT *
49293027 2927 FROM {$CFG->prefix}role_capabilities
2928 WHERE contextid = $context->id
2929 AND roleid = $role->id");
01e52ac7 2930}
2931
5b5781f4 2932// find out which roles has assignment on this context
2933function get_roles_with_assignment_on_context($context) {
ece4945b 2934
5b5781f4 2935 global $CFG;
ece4945b 2936
5b5781f4 2937 return get_records_sql("SELECT DISTINCT r.*
2938 FROM {$CFG->prefix}role_assignments ra,
2939 {$CFG->prefix}role r
2940 WHERE ra.roleid = r.id
2941 AND ra.contextid = $context->id");
2942}
2943
2944
2945
01e52ac7 2946/* find all user assignemnt of users for this role, on this context
2947 */
2948function get_users_from_role_on_context($role, $context) {
b5959f30 2949
01e52ac7 2950 global $CFG;
b5959f30 2951
01e52ac7 2952 return get_records_sql("SELECT *
2953 FROM {$CFG->prefix}role_assignments
2954 WHERE contextid = $context->id
b5959f30 2955 AND roleid = $role->id");
01e52ac7 2956}
3a52e764 2957
f3652521 2958?>