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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Library of functions for database manipulation.
*
* Other main libraries:
* - weblib.php - functions that produce web output
* - moodlelib.php - general-purpose Moodle functions
*
* @package core
* @subpackage lib
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* The maximum courses in a category
* MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
*/
define('MAX_COURSES_IN_CATEGORY', 10000);
/**
* The maximum number of course categories
* MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
*/
define('MAX_COURSE_CATEGORIES', 10000);
/**
* Number of seconds to wait before updating lastaccess information in DB.
*/
define('LASTACCESS_UPDATE_SECS', 60);
/**
* Returns $user object of the main admin user
*
* @static stdClass $mainadmin
* @return stdClass {@link $USER} record from DB, false if not found
*/
function get_admin() {
global $CFG, $DB;
static $mainadmin = null;
if (isset($mainadmin)) {
return clone($mainadmin);
}
if (empty($CFG->siteadmins)) { // Should not happen on an ordinary site
return false;
}
foreach (explode(',', $CFG->siteadmins) as $id) {
if ($user = $DB->get_record('user', array('id'=>$id, 'deleted'=>0))) {
$mainadmin = $user;
break;
}
}
if ($mainadmin) {
return clone($mainadmin);
} else {
// this should not happen
return false;
}
}
/**
* Returns list of all admins, using 1 DB query
*
* @return array
*/
function get_admins() {
global $DB, $CFG;
if (empty($CFG->siteadmins)) { // Should not happen on an ordinary site
return array();
}
$sql = "SELECT u.*
FROM {user} u
WHERE u.deleted = 0 AND u.id IN ($CFG->siteadmins)";
return $DB->get_records_sql($sql);
}
/**
* Search through course users
*
* If $coursid specifies the site course then this function searches
* through all undeleted and confirmed users
*
* @global object
* @uses SITEID
* @uses SQL_PARAMS_NAMED
* @uses CONTEXT_COURSE
* @param int $courseid The course in question.
* @param int $groupid The group in question.
* @param string $searchtext The string to search for
* @param string $sort A field to sort by
* @param array $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
* @return array
*/
function search_users($courseid, $groupid, $searchtext, $sort='', array $exceptions=null) {
global $DB;
$fullname = $DB->sql_fullname('u.firstname', 'u.lastname');
if (!empty($exceptions)) {
list($exceptions, $params) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex', false);
$except = "AND u.id $exceptions";
} else {
$except = "";
$params = array();
}
if (!empty($sort)) {
$order = "ORDER BY $sort";
} else {
$order = "";
}
$select = "u.deleted = 0 AND u.confirmed = 1 AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('u.email', ':search2', false).")";
$params['search1'] = "%$searchtext%";
$params['search2'] = "%$searchtext%";
if (!$courseid or $courseid == SITEID) {
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
WHERE $select
$except
$order";
return $DB->get_records_sql($sql, $params);
} else {
if ($groupid) {
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
JOIN {groups_members} gm ON gm.userid = u.id
WHERE $select AND gm.groupid = :groupid
$except
$order";
$params['groupid'] = $groupid;
return $DB->get_records_sql($sql, $params);
} else {
$context = get_context_instance(CONTEXT_COURSE, $courseid);
$contextlists = get_related_contexts_string($context);
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
JOIN {role_assignments} ra ON ra.userid = u.id
WHERE $select AND ra.contextid $contextlists
$except
$order";
return $DB->get_records_sql($sql, $params);
}
}
}
/**
* Returns a subset of users
*
* @global object
* @uses DEBUG_DEVELOPER
* @uses SQL_PARAMS_NAMED
* @param bool $get If false then only a count of the records is returned
* @param string $search A simple string to search for
* @param bool $confirmed A switch to allow/disallow unconfirmed users
* @param array $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
* @param string $sort A SQL snippet for the sorting criteria to use
* @param string $firstinitial Users whose first name starts with $firstinitial
* @param string $lastinitial Users whose last name starts with $lastinitial
* @param string $page The page or records to return
* @param string $recordsperpage The number of records to return per page
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @return array|int|bool {@link $USER} records unless get is false in which case the integer count of the records found is returned.
* False is returned if an error is encountered.
*/
function get_users($get=true, $search='', $confirmed=false, array $exceptions=null, $sort='firstname ASC',
$firstinitial='', $lastinitial='', $page='', $recordsperpage='', $fields='*', $extraselect='', array $extraparams=null) {
global $DB, $CFG;
if ($get && !$recordsperpage) {
debugging('Call to get_users with $get = true no $recordsperpage limit. ' .
'On large installations, this will probably cause an out of memory error. ' .
'Please think again and change your code so that it does not try to ' .
'load so much data into memory.', DEBUG_DEVELOPER);
}
$fullname = $DB->sql_fullname();
$select = " id <> :guestid AND deleted = 0";
$params = array('guestid'=>$CFG->siteguest);
if (!empty($search)){
$search = trim($search);
$select .= " AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('email', ':search2', false)." OR username = :search3)";
$params['search1'] = "%$search%";
$params['search2'] = "%$search%";
$params['search3'] = "$search";
}
if ($confirmed) {
$select .= " AND confirmed = 1";
}
if ($exceptions) {
list($exceptions, $eparams) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex', false);
$params = $params + $eparams;
$except = " AND id $exceptions";
}
if ($firstinitial) {
$select .= " AND ".$DB->sql_like('firstname', ':fni', false, false);
$params['fni'] = "$firstinitial%";
}
if ($lastinitial) {
$select .= " AND ".$DB->sql_like('lastname', ':lni', false, false);
$params['lni'] = "$lastinitial%";
}
if ($extraselect) {
$select .= " AND $extraselect";
$params = $params + (array)$extraparams;
}
if ($get) {
return $DB->get_records_select('user', $select, $params, $sort, $fields, $page, $recordsperpage);
} else {
return $DB->count_records_select('user', $select, $params);
}
}
/**
* @todo Finish documenting this function
*
* @param string $sort An SQL field to sort by
* @param string $dir The sort direction ASC|DESC
* @param int $page The page or records to return
* @param int $recordsperpage The number of records to return per page
* @param string $search A simple string to search for
* @param string $firstinitial Users whose first name starts with $firstinitial
* @param string $lastinitial Users whose last name starts with $lastinitial
* @param string $extraselect An additional SQL select statement to append to the query
* @param array $extraparams Additional parameters to use for the above $extraselect
* @param object $extracontext If specified, will include user 'extra fields'
* as appropriate for current user and given context
* @return array Array of {@link $USER} records
*/
function get_users_listing($sort='lastaccess', $dir='ASC', $page=0, $recordsperpage=0,
$search='', $firstinitial='', $lastinitial='', $extraselect='',
array $extraparams=null, $extracontext = null) {
global $DB;
$fullname = $DB->sql_fullname();
$select = "deleted <> 1";
$params = array();
if (!empty($search)) {
$search = trim($search);
$select .= " AND (". $DB->sql_like($fullname, ':search1', false, false).
" OR ". $DB->sql_like('email', ':search2', false, false).
" OR username = :search3)";
$params['search1'] = "%$search%";
$params['search2'] = "%$search%";
$params['search3'] = "$search";
}
if ($firstinitial) {
$select .= " AND ". $DB->sql_like('firstname', ':fni', false, false);
$params['fni'] = "$firstinitial%";
}
if ($lastinitial) {
$select .= " AND ". $DB->sql_like('lastname', ':lni', false, false);
$params['lni'] = "$lastinitial%";
}
if ($extraselect) {
$select .= " AND $extraselect";
$params = $params + (array)$extraparams;
}
if ($sort) {
$sort = " ORDER BY $sort $dir";
}
// If a context is specified, get extra user fields that the current user
// is supposed to see.
$extrafields = '';
if ($extracontext) {
$extrafields = get_extra_user_fields_sql($extracontext, '', '',
array('id', 'username', 'email', 'firstname', 'lastname', 'city', 'country',
'lastaccess', 'confirmed', 'mnethostid'));
}
// warning: will return UNCONFIRMED USERS
return $DB->get_records_sql("SELECT id, username, email, firstname, lastname, city, country,
lastaccess, confirmed, mnethostid, suspended $extrafields
FROM {user}
WHERE $select
$sort", $params, $page, $recordsperpage);
}
/**
* Full list of users that have confirmed their accounts.
*
* @global object
* @return array of unconfirmed users
*/
function get_users_confirmed() {
global $DB, $CFG;
return $DB->get_records_sql("SELECT *
FROM {user}
WHERE confirmed = 1 AND deleted = 0 AND id <> ?", array($CFG->siteguest));
}
/// OTHER SITE AND COURSE FUNCTIONS /////////////////////////////////////////////
/**
* Returns $course object of the top-level site.
*
* @return object A {@link $COURSE} object for the site, exception if not found
*/
function get_site() {
global $SITE, $DB;
if (!empty($SITE->id)) { // We already have a global to use, so return that
return $SITE;
}
if ($course = $DB->get_record('course', array('category'=>0))) {
return $course;
} else {
// course table exists, but the site is not there,
// unfortunately there is no automatic way to recover
throw new moodle_exception('nosite', 'error');
}
}
/**
* Returns list of courses, for whole site, or category
*
* Returns list of courses, for whole site, or category
* Important: Using c.* for fields is extremely expensive because
* we are using distinct. You almost _NEVER_ need all the fields
* in such a large SELECT
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @param string|int $categoryid Either a category id or 'all' for everything
* @param string $sort A field and direction to sort by
* @param string $fields The additional fields to return
* @return array Array of courses
*/
function get_courses($categoryid="all", $sort="c.sortorder ASC", $fields="c.*") {
global $USER, $CFG, $DB;
$params = array();
if ($categoryid !== "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = :catid";
$params['catid'] = $categoryid;
} else {
$categoryselect = "";
}
if (empty($sort)) {
$sortstatement = "";
} else {
$sortstatement = "ORDER BY $sort";
}
$visiblecourses = array();
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT $fields $ccselect
FROM {course} c
$ccjoin
$categoryselect
$sortstatement";
// pull out all course matching the cat
if ($courses = $DB->get_records_sql($sql, $params)) {
// loop throught them
foreach ($courses as $course) {
context_instance_preload($course);
if (isset($course->visible) && $course->visible <= 0) {
// for hidden courses, require visibility check
if (has_capability('moodle/course:viewhiddencourses', get_context_instance(CONTEXT_COURSE, $course->id))) {
$visiblecourses [$course->id] = $course;
}
} else {
$visiblecourses [$course->id] = $course;
}
}
}
return $visiblecourses;
}
/**
* Returns list of courses, for whole site, or category
*
* Similar to get_courses, but allows paging
* Important: Using c.* for fields is extremely expensive because
* we are using distinct. You almost _NEVER_ need all the fields
* in such a large SELECT
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @param string|int $categoryid Either a category id or 'all' for everything
* @param string $sort A field and direction to sort by
* @param string $fields The additional fields to return
* @param int $totalcount Reference for the number of courses
* @param string $limitfrom The course to start from
* @param string $limitnum The number of courses to limit to
* @return array Array of courses
*/
function get_courses_page($categoryid="all", $sort="c.sortorder ASC", $fields="c.*",
&$totalcount, $limitfrom="", $limitnum="") {
global $USER, $CFG, $DB;
$params = array();
$categoryselect = "";
if ($categoryid != "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = :catid";
$params['catid'] = $categoryid;
} else {
$categoryselect = "";
}
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$totalcount = 0;
if (!$limitfrom) {
$limitfrom = 0;
}
$visiblecourses = array();
$sql = "SELECT $fields $ccselect
FROM {course} c
$ccjoin
$categoryselect
ORDER BY $sort";
// pull out all course matching the cat
$rs = $DB->get_recordset_sql($sql, $params);
// iteration will have to be done inside loop to keep track of the limitfrom and limitnum
foreach($rs as $course) {
context_instance_preload($course);
if ($course->visible <= 0) {
// for hidden courses, require visibility check
if (has_capability('moodle/course:viewhiddencourses', get_context_instance(CONTEXT_COURSE, $course->id))) {
$totalcount++;
if ($totalcount > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
$visiblecourses [$course->id] = $course;
}
}
} else {
$totalcount++;
if ($totalcount > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
$visiblecourses [$course->id] = $course;
}
}
}
$rs->close();
return $visiblecourses;
}
/**
* Retrieve course records with the course managers and other related records
* that we need for print_course(). This allows print_courses() to do its job
* in a constant number of DB queries, regardless of the number of courses,
* role assignments, etc.
*
* The returned array is indexed on c.id, and each course will have
* - $course->managers - array containing RA objects that include a $user obj
* with the minimal fields needed for fullname()
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @uses CONTEXT_SYSTEM
* @uses CONTEXT_COURSECAT
* @uses SITEID
* @param int|string $categoryid Either the categoryid for the courses or 'all'
* @param string $sort A SQL sort field and direction
* @param array $fields An array of additional fields to fetch
* @return array
*/
function get_courses_wmanagers($categoryid=0, $sort="c.sortorder ASC", $fields=array()) {
/*
* The plan is to
*
* - Grab the courses JOINed w/context
*
* - Grab the interesting course-manager RAs
* JOINed with a base user obj and add them to each course
*
* So as to do all the work in 2 DB queries. The RA+user JOIN
* ends up being pretty expensive if it happens over _all_
* courses on a large site. (Are we surprised!?)
*
* So this should _never_ get called with 'all' on a large site.
*
*/
global $USER, $CFG, $DB;
$params = array();
$allcats = false; // bool flag
if ($categoryid === 'all') {
$categoryclause = '';
$allcats = true;
} elseif (is_numeric($categoryid)) {
$categoryclause = "c.category = :catid";
$params['catid'] = $categoryid;
} else {
debugging("Could not recognise categoryid = $categoryid");
$categoryclause = '';
}
$basefields = array('id', 'category', 'sortorder',
'shortname', 'fullname', 'idnumber',
'startdate', 'visible',
'newsitems', 'groupmode', 'groupmodeforce');
if (!is_null($fields) && is_string($fields)) {
if (empty($fields)) {
$fields = $basefields;
} else {
// turn the fields from a string to an array that
// get_user_courses_bycap() will like...
$fields = explode(',',$fields);
$fields = array_map('trim', $fields);
$fields = array_unique(array_merge($basefields, $fields));
}
} elseif (is_array($fields)) {
$fields = array_merge($basefields,$fields);
}
$coursefields = 'c.' .join(',c.', $fields);
if (empty($sort)) {
$sortstatement = "";
} else {
$sortstatement = "ORDER BY $sort";
}
$where = 'WHERE c.id != ' . SITEID;
if ($categoryclause !== ''){
$where = "$where AND $categoryclause";
}
// pull out all courses matching the cat
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT $coursefields $ccselect
FROM {course} c
$ccjoin
$where
$sortstatement";
$catpaths = array();
$catpath = NULL;
if ($courses = $DB->get_records_sql($sql, $params)) {
// loop on courses materialising
// the context, and prepping data to fetch the
// managers efficiently later...
foreach ($courses as $k => $course) {
context_instance_preload($course);
$coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
$courses[$k] = $course;
$courses[$k]->managers = array();
if ($allcats === false) {
// single cat, so take just the first one...
if ($catpath === NULL) {
$catpath = preg_replace(':/\d+$:', '', $coursecontext->path);
}
} else {
// chop off the contextid of the course itself
// like dirname() does...
$catpaths[] = preg_replace(':/\d+$:', '', $coursecontext->path);
}
}
} else {
return array(); // no courses!
}
$CFG->coursecontact = trim($CFG->coursecontact);
if (empty($CFG->coursecontact)) {
return $courses;
}
$managerroles = explode(',', $CFG->coursecontact);
$catctxids = '';
if (count($managerroles)) {
if ($allcats === true) {
$catpaths = array_unique($catpaths);
$ctxids = array();
foreach ($catpaths as $cpath) {
$ctxids = array_merge($ctxids, explode('/',substr($cpath,1)));
}
$ctxids = array_unique($ctxids);
$catctxids = implode( ',' , $ctxids);
unset($catpaths);
unset($cpath);
} else {
// take the ctx path from the first course
// as all categories will be the same...
$catpath = substr($catpath,1);
$catpath = preg_replace(':/\d+$:','',$catpath);
$catctxids = str_replace('/',',',$catpath);
}
if ($categoryclause !== '') {
$categoryclause = "AND $categoryclause";
}
/*
* Note: Here we use a LEFT OUTER JOIN that can
* "optionally" match to avoid passing a ton of context
* ids in an IN() clause. Perhaps a subselect is faster.
*
* In any case, this SQL is not-so-nice over large sets of
* courses with no $categoryclause.
*
*/
$sql = "SELECT ctx.path, ctx.instanceid, ctx.contextlevel,
r.id AS roleid, r.name as rolename,
u.id AS userid, u.firstname, u.lastname
FROM {role_assignments} ra
JOIN {context} ctx ON ra.contextid = ctx.id
JOIN {user} u ON ra.userid = u.id
JOIN {role} r ON ra.roleid = r.id
LEFT OUTER JOIN {course} c
ON (ctx.instanceid=c.id AND ctx.contextlevel=".CONTEXT_COURSE.")
WHERE ( c.id IS NOT NULL";
// under certain conditions, $catctxids is NULL
if($catctxids == NULL){
$sql .= ") ";
}else{
$sql .= " OR ra.contextid IN ($catctxids) )";
}
$sql .= "AND ra.roleid IN ({$CFG->coursecontact})
$categoryclause
ORDER BY r.sortorder ASC, ctx.contextlevel ASC, ra.sortorder ASC";
$rs = $DB->get_recordset_sql($sql, $params);
// This loop is fairly stupid as it stands - might get better
// results doing an initial pass clustering RAs by path.
foreach($rs as $ra) {
$user = new stdClass;
$user->id = $ra->userid; unset($ra->userid);
$user->firstname = $ra->firstname; unset($ra->firstname);
$user->lastname = $ra->lastname; unset($ra->lastname);
$ra->user = $user;
if ($ra->contextlevel == CONTEXT_SYSTEM) {
foreach ($courses as $k => $course) {
$courses[$k]->managers[] = $ra;
}
} else if ($ra->contextlevel == CONTEXT_COURSECAT) {
if ($allcats === false) {
// It always applies
foreach ($courses as $k => $course) {
$courses[$k]->managers[] = $ra;
}
} else {
foreach ($courses as $k => $course) {
$coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
// Note that strpos() returns 0 as "matched at pos 0"
if (strpos($coursecontext->path, $ra->path.'/') === 0) {
// Only add it to subpaths
$courses[$k]->managers[] = $ra;
}
}
}
} else { // course-level
if (!array_key_exists($ra->instanceid, $courses)) {
//this course is not in a list, probably a frontpage course
continue;
}
$courses[$ra->instanceid]->managers[] = $ra;
}
}
$rs->close();
}
return $courses;
}
/**
* A list of courses that match a search
*
* @global object
* @global object
* @param array $searchterms An array of search criteria
* @param string $sort A field and direction to sort by
* @param int $page The page number to get
* @param int $recordsperpage The number of records per page
* @param int $totalcount Passed in by reference.
* @return object {@link $COURSE} records
*/
function get_courses_search($searchterms, $sort='fullname ASC', $page=0, $recordsperpage=50, &$totalcount) {
global $CFG, $DB;
if ($DB->sql_regex_supported()) {
$REGEXP = $DB->sql_regex(true);
$NOTREGEXP = $DB->sql_regex(false);
}
$searchcond = array();
$params = array();
$i = 0;
// Thanks Oracle for your non-ansi concat and type limits in coalesce. MDL-29912
if ($DB->get_dbfamily() == 'oracle') {
$concat = $DB->sql_concat('c.summary', "' '", 'c.fullname', "' '", 'c.idnumber', "' '", 'c.shortname');
} else {
$concat = $DB->sql_concat("COALESCE(c.summary, '". $DB->sql_empty() ."')", "' '", 'c.fullname', "' '", 'c.idnumber', "' '", 'c.shortname');
}
foreach ($searchterms as $searchterm) {
$i++;
$NOT = false; /// Initially we aren't going to perform NOT LIKE searches, only MSSQL and Oracle
/// will use it to simulate the "-" operator with LIKE clause
/// Under Oracle and MSSQL, trim the + and - operators and perform
/// simpler LIKE (or NOT LIKE) queries
if (!$DB->sql_regex_supported()) {
if (substr($searchterm, 0, 1) == '-') {
$NOT = true;
}
$searchterm = trim($searchterm, '+-');
}
// TODO: +- may not work for non latin languages
if (substr($searchterm,0,1) == '+') {
$searchterm = trim($searchterm, '+-');
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "$concat $REGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else if (substr($searchterm,0,1) == "-") {
$searchterm = trim($searchterm, '+-');
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "$concat $NOTREGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else {
$searchcond[] = $DB->sql_like($concat,":ss$i", false, true, $NOT);
$params['ss'.$i] = "%$searchterm%";
}
}
if (empty($searchcond)) {
$totalcount = 0;
return array();
}
$searchcond = implode(" AND ", $searchcond);
$courses = array();
$c = 0; // counts how many visible courses we've seen
// Tiki pagination
$limitfrom = $page * $recordsperpage;
$limitto = $limitfrom + $recordsperpage;
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT c.* $ccselect
FROM {course} c
$ccjoin
WHERE $searchcond AND c.id <> ".SITEID."
ORDER BY $sort";
$rs = $DB->get_recordset_sql($sql, $params);
foreach($rs as $course) {
context_instance_preload($course);
$coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
if ($course->visible || has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
// Don't exit this loop till the end
// we need to count all the visible courses
// to update $totalcount
if ($c >= $limitfrom && $c < $limitto) {
$courses[$course->id] = $course;
}
$c++;
}
}
$rs->close();
// our caller expects 2 bits of data - our return
// array, and an updated $totalcount
$totalcount = $c;
return $courses;
}
/**
* Returns a sorted list of categories. Each category object has a context
* property that is a context object.
*
* When asking for $parent='none' it will return all the categories, regardless
* of depth. Wheen asking for a specific parent, the default is to return
* a "shallow" resultset. Pass false to $shallow and it will return all
* the child categories as well.
*
* @global object
* @uses CONTEXT_COURSECAT
* @param string $parent The parent category if any
* @param string $sort the sortorder
* @param bool $shallow - set to false to get the children too
* @return array of categories
*/
function get_categories($parent='none', $sort=NULL, $shallow=true) {
global $DB;
if ($sort === NULL) {
$sort = 'ORDER BY cc.sortorder ASC';
} elseif ($sort ==='') {
// leave it as empty
} else {
$sort = "ORDER BY $sort";
}
list($ccselect, $ccjoin) = context_instance_preload_sql('cc.id', CONTEXT_COURSECAT, 'ctx');
if ($parent === 'none') {
$sql = "SELECT cc.* $ccselect
FROM {course_categories} cc
$ccjoin
$sort";
$params = array();
} elseif ($shallow) {
$sql = "SELECT cc.* $ccselect
FROM {course_categories} cc
$ccjoin
WHERE cc.parent=?
$sort";
$params = array($parent);
} else {
$sql = "SELECT cc.* $ccselect
FROM {course_categories} cc
$ccjoin
JOIN {course_categories} ccp
ON ((cc.parent = ccp.id) OR (cc.path LIKE ".$DB->sql_concat('ccp.path',"'/%'")."))
WHERE ccp.id=?
$sort";
$params = array($parent);
}
$categories = array();
$rs = $DB->get_recordset_sql($sql, $params);
foreach($rs as $cat) {
context_instance_preload($cat);
$catcontext = get_context_instance(CONTEXT_COURSECAT, $cat->id);
if ($cat->visible || has_capability('moodle/category:viewhiddencategories', $catcontext)) {
$categories[$cat->id] = $cat;
}
}
$rs->close();
return $categories;
}
/**
* Returns an array of category ids of all the subcategories for a given
* category.
*
* @global object
* @param int $catid - The id of the category whose subcategories we want to find.
* @return array of category ids.
*/
function get_all_subcategories($catid) {
global $DB;
$subcats = array();
if ($categories = $DB->get_records('course_categories', array('parent'=>$catid))) {
foreach ($categories as $cat) {
array_push($subcats, $cat->id);
$subcats = array_merge($subcats, get_all_subcategories($cat->id));
}
}
return $subcats;
}
/**
* Return specified category, default if given does not exist
*
* @global object
* @uses MAX_COURSES_IN_CATEGORY
* @uses CONTEXT_COURSECAT
* @uses SYSCONTEXTID
* @param int $catid course category id
* @return object caregory
*/
function get_course_category($catid=0) {
global $DB;
$category = false;
if (!empty($catid)) {
$category = $DB->get_record('course_categories', array('id'=>$catid));
}
if (!$category) {
// the first category is considered default for now
if ($category = $DB->get_records('course_categories', null, 'sortorder', '*', 0, 1)) {
$category = reset($category);
} else {
$cat = new stdClass();
$cat->name = get_string('miscellaneous');
$cat->depth = 1;
$cat->sortorder = MAX_COURSES_IN_CATEGORY;
$cat->timemodified = time();
$catid = $DB->insert_record('course_categories', $cat);
// make sure category context exists
get_context_instance(CONTEXT_COURSECAT, $catid);
mark_context_dirty('/'.SYSCONTEXTID);
fix_course_sortorder(); // Required to build course_categories.depth and .path.
$category = $DB->get_record('course_categories', array('id'=>$catid));
}
}
return $category;
}
/**
* Fixes course category and course sortorder, also verifies category and course parents and paths.
* (circular references are not fixed)
*
* @global object
* @global object
* @uses MAX_COURSES_IN_CATEGORY
* @uses MAX_COURSE_CATEGORIES
* @uses SITEID
* @uses CONTEXT_COURSE
* @return void
*/
function fix_course_sortorder() {
global $DB, $SITE;
//WARNING: this is PHP5 only code!
if ($unsorted = $DB->get_records('course_categories', array('sortorder'=>0))) {
//move all categories that are not sorted yet to the end
$DB->set_field('course_categories', 'sortorder', MAX_COURSES_IN_CATEGORY*MAX_COURSE_CATEGORIES, array('sortorder'=>0));
}
$allcats = $DB->get_records('course_categories', null, 'sortorder, id', 'id, sortorder, parent, depth, path');
$topcats = array();
$brokencats = array();
foreach ($allcats as $cat) {
$sortorder = (int)$cat->sortorder;
if (!$cat->parent) {
while(isset($topcats[$sortorder])) {
$sortorder++;
}
$topcats[$sortorder] = $cat;
continue;
}
if (!isset($allcats[$cat->parent])) {
$brokencats[] = $cat;
continue;
}
if (!isset($allcats[$cat->parent]->children)) {
$allcats[$cat->parent]->children = array();
}
while(isset($allcats[$cat->parent]->children[$sortorder])) {
$sortorder++;
}
$allcats[$cat->parent]->children[$sortorder] = $cat;
}
unset($allcats);
// add broken cats to category tree
if ($brokencats) {
$defaultcat = reset($topcats);
foreach ($brokencats as $cat) {
$topcats[] = $cat;
}
}
// now walk recursively the tree and fix any problems found
$sortorder = 0;
$fixcontexts = array();
_fix_course_cats($topcats, $sortorder, 0, 0, '', $fixcontexts);
// detect if there are "multiple" frontpage courses and fix them if needed
$frontcourses = $DB->get_records('course', array('category'=>0), 'id');
if (count($frontcourses) > 1) {
if (isset($frontcourses[SITEID])) {
$frontcourse = $frontcourses[SITEID];
unset($frontcourses[SITEID]);
} else {
$frontcourse = array_shift($frontcourses);
}
$defaultcat = reset($topcats);
foreach ($frontcourses as $course) {
$DB->set_field('course', 'category', $defaultcat->id, array('id'=>$course->id));
$context = get_context_instance(CONTEXT_COURSE, $course->id);
$fixcontexts[$context->id] = $context;
}
unset($frontcourses);
} else {
$frontcourse = reset($frontcourses);
}
// now fix the paths and depths in context table if needed
if ($fixcontexts) {
foreach ($fixcontexts as $fixcontext) {
$fixcontext->reset_paths(false);
}
context_helper::build_all_paths(false);
unset($fixcontexts);
}
// release memory
unset($topcats);
unset($brokencats);
unset($fixcontexts);
// fix frontpage course sortorder
if ($frontcourse->sortorder != 1) {
$DB->set_field('course', 'sortorder', 1, array('id'=>$frontcourse->id));
}
// now fix the course counts in category records if needed
$sql = "SELECT cc.id, cc.coursecount, COUNT(c.id) AS newcount
FROM {course_categories} cc
LEFT JOIN {course} c ON c.category = cc.id
GROUP BY cc.id, cc.coursecount
HAVING cc.coursecount <> COUNT(c.id)";
if ($updatecounts = $DB->get_records_sql($sql)) {
// categories with more courses than MAX_COURSES_IN_CATEGORY
$categories = array();
foreach ($updatecounts as $cat) {
$cat->coursecount = $cat->newcount;
if ($cat->coursecount >= MAX_COURSES_IN_CATEGORY) {
$categories[] = $cat->id;
}
unset($cat->newcount);
$DB->update_record_raw('course_categories', $cat, true);
}
if (!empty($categories)) {
$str = implode(', ', $categories);
debugging("The number of courses (category id: $str) has reached MAX_COURSES_IN_CATEGORY (" . MAX_COURSES_IN_CATEGORY . "), it will cause a sorting performance issue, please increase the value of MAX_COURSES_IN_CATEGORY in lib/datalib.php file. See tracker issue: MDL-25669", DEBUG_DEVELOPER);
}
}
// now make sure that sortorders in course table are withing the category sortorder ranges
$sql = "SELECT DISTINCT cc.id, cc.sortorder
FROM {course_categories} cc
JOIN {course} c ON c.category = cc.id
WHERE c.sortorder < cc.sortorder OR c.sortorder > cc.sortorder + ".MAX_COURSES_IN_CATEGORY;
if ($fixcategories = $DB->get_records_sql($sql)) {
//fix the course sortorder ranges
foreach ($fixcategories as $cat) {
$sql = "UPDATE {course}
SET sortorder = ".$DB->sql_modulo('sortorder', MAX_COURSES_IN_CATEGORY)." + ?
WHERE category = ?";
$DB->execute($sql, array($cat->sortorder, $cat->id));
}
}
unset($fixcategories);
// categories having courses with sortorder duplicates or having gaps in sortorder
$sql = "SELECT DISTINCT c1.category AS id , cc.sortorder
FROM {course} c1
JOIN {course} c2 ON c1.sortorder = c2.sortorder
JOIN {course_categories} cc ON (c1.category = cc.id)
WHERE c1.id <> c2.id";
$fixcategories = $DB->get_records_sql($sql);
$sql = "SELECT cc.id, cc.sortorder, cc.coursecount, MAX(c.sortorder) AS maxsort, MIN(c.sortorder) AS minsort
FROM {course_categories} cc
JOIN {course} c ON c.category = cc.id
GROUP BY cc.id, cc.sortorder, cc.coursecount
HAVING (MAX(c.sortorder) <> cc.sortorder + cc.coursecount) OR (MIN(c.sortorder) <> cc.sortorder + 1)";
$gapcategories = $DB->get_records_sql($sql);
foreach ($gapcategories as $cat) {
if (isset($fixcategories[$cat->id])) {
// duplicates detected already
} else if ($cat->minsort == $cat->sortorder and $cat->maxsort == $cat->sortorder + $cat->coursecount - 1) {
// easy - new course inserted with sortorder 0, the rest is ok
$sql = "UPDATE {course}
SET sortorder = sortorder + 1
WHERE category = ?";
$DB->execute($sql, array($cat->id));
} else {
// it needs full resorting
$fixcategories[$cat->id] = $cat;
}
}
unset($gapcategories);
// fix course sortorders in problematic categories only
foreach ($fixcategories as $cat) {
$i = 1;
$courses = $DB->get_records('course', array('category'=>$cat->id), 'sortorder ASC, id DESC', 'id, sortorder');
foreach ($courses as $course) {
if ($course->sortorder != $cat->sortorder + $i) {
$course->sortorder = $cat->sortorder + $i;
$DB->update_record_raw('course', $course, true);
}
$i++;
}
}
}
/**
* Internal recursive category verification function, do not use directly!
*
* @todo Document the arguments of this function better
*
* @global object
* @uses MAX_COURSES_IN_CATEGORY
* @uses CONTEXT_COURSECAT
* @param array $children
* @param int $sortorder
* @param string $parent
* @param int $depth
* @param string $path
* @param array $fixcontexts
* @return void
*/
function _fix_course_cats($children, &$sortorder, $parent, $depth, $path, &$fixcontexts) {
global $DB;
$depth++;
foreach ($children as $cat) {
$sortorder = $sortorder + MAX_COURSES_IN_CATEGORY;
$update = false;
if ($parent != $cat->parent or $depth != $cat->depth or $path.'/'.$cat->id != $cat->path) {
$cat->parent = $parent;
$cat->depth = $depth;
$cat->path = $path.'/'.$cat->id;
$update = true;
// make sure context caches are rebuild and dirty contexts marked
$context = get_context_instance(CONTEXT_COURSECAT, $cat->id);
$fixcontexts[$context->id] = $context;
}
if ($cat->sortorder != $sortorder) {
$cat->sortorder = $sortorder;
$update = true;
}
if ($update) {
$DB->update_record('course_categories', $cat, true);
}
if (isset($cat->children)) {
_fix_course_cats($cat->children, $sortorder, $cat->id, $cat->depth, $cat->path, $fixcontexts);
}
}
}
/**
* List of remote courses that a user has access to via MNET.
* Works only on the IDP
*
* @global object
* @global object
* @param int @userid The user id to get remote courses for
* @return array Array of {@link $COURSE} of course objects
*/
function get_my_remotecourses($userid=0) {
global $DB, $USER;
if (empty($userid)) {
$userid = $USER->id;
}
// we can not use SELECT DISTINCT + text field (summary) because of MS SQL and Oracle, subselect used therefore
$sql = "SELECT c.id, c.remoteid, c.shortname, c.fullname,
c.hostid, c.summary, c.summaryformat, c.categoryname AS cat_name,
h.name AS hostname
FROM {mnetservice_enrol_courses} c
JOIN (SELECT DISTINCT hostid, remotecourseid
FROM {mnetservice_enrol_enrolments}
WHERE userid = ?
) e ON (e.hostid = c.hostid AND e.remotecourseid = c.remoteid)
JOIN {mnet_host} h ON h.id = c.hostid";
return $DB->get_records_sql($sql, array($userid));
}
/**
* List of remote hosts that a user has access to via MNET.
* Works on the SP
*
* @global object
* @global object
* @return array|bool Array of host objects or false
*/
function get_my_remotehosts() {
global $CFG, $USER;
if ($USER->mnethostid == $CFG->mnet_localhost_id) {
return false; // Return nothing on the IDP
}
if (!empty($USER->mnet_foreign_host_array) && is_array($USER->mnet_foreign_host_array)) {
return $USER->mnet_foreign_host_array;
}
return false;
}
/**
* This function creates a default separated/connected scale
*
* This function creates a default separated/connected scale
* so there's something in the database. The locations of
* strings and files is a bit odd, but this is because we
* need to maintain backward compatibility with many different
* existing language translations and older sites.
*
* @global object
* @return void
*/
function make_default_scale() {
global $DB;
$defaultscale = new stdClass();
$defaultscale->courseid = 0;
$defaultscale->userid = 0;
$defaultscale->name = get_string('separateandconnected');
$defaultscale->description = get_string('separateandconnectedinfo');
$defaultscale->scale = get_string('postrating1', 'forum').','.
get_string('postrating2', 'forum').','.
get_string('postrating3', 'forum');
$defaultscale->timemodified = time();
$defaultscale->id = $DB->insert_record('scale', $defaultscale);
$DB->execute("UPDATE {forum} SET scale = ?", array($defaultscale->id));
}
/**
* Returns a menu of all available scales from the site as well as the given course
*
* @global object
* @param int $courseid The id of the course as found in the 'course' table.
* @return array
*/
function get_scales_menu($courseid=0) {
global $DB;
$sql = "SELECT id, name
FROM {scale}
WHERE courseid = 0 or courseid = ?
ORDER BY courseid ASC, name ASC";
$params = array($courseid);
if ($scales = $DB->get_records_sql_menu($sql, $params)) {
return $scales;
}
make_default_scale();
return $DB->get_records_sql_menu($sql, $params);
}
/**
* Given a set of timezone records, put them in the database, replacing what is there
*
* @global object
* @param array $timezones An array of timezone records
* @return void
*/
function update_timezone_records($timezones) {
global $DB;
/// Clear out all the old stuff
$DB->delete_records('timezone');
/// Insert all the new stuff
foreach ($timezones as $timezone) {
if (is_array($timezone)) {
$timezone = (object)$timezone;
}
$DB->insert_record('timezone', $timezone);
}
}
/// MODULE FUNCTIONS /////////////////////////////////////////////////
/**
* Just gets a raw list of all modules in a course
*
* @global object
* @param int $courseid The id of the course as found in the 'course' table.
* @return array
*/
function get_course_mods($courseid) {
global $DB;
if (empty($courseid)) {
return false; // avoid warnings
}
return $DB->get_records_sql("SELECT cm.*, m.name as modname
FROM {modules} m, {course_modules} cm
WHERE cm.course = ? AND cm.module = m.id AND m.visible = 1",
array($courseid)); // no disabled mods
}
/**
* Given an id of a course module, finds the coursemodule description
*
* @global object
* @param string $modulename name of module type, eg. resource, assignment,... (optional, slower and less safe if not specified)
* @param int $cmid course module id (id in course_modules table)
* @param int $courseid optional course id for extra validation
* @param bool $sectionnum include relative section number (0,1,2 ...)
* @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
* IGNORE_MULTIPLE means return first, ignore multiple records found(not recommended);
* MUST_EXIST means throw exception if no record or multiple records found
* @return stdClass
*/
function get_coursemodule_from_id($modulename, $cmid, $courseid=0, $sectionnum=false, $strictness=IGNORE_MISSING) {
global $DB;
$params = array('cmid'=>$cmid);
if (!$modulename) {
if (!$modulename = $DB->get_field_sql("SELECT md.name
FROM {modules} md
JOIN {course_modules} cm ON cm.module = md.id
WHERE cm.id = :cmid", $params, $strictness)) {
return false;
}
}
$params['modulename'] = $modulename;
$courseselect = "";
$sectionfield = "";
$sectionjoin = "";
if ($courseid) {
$courseselect = "AND cm.course = :courseid";
$params['courseid'] = $courseid;
}
if ($sectionnum) {
$sectionfield = ", cw.section AS sectionnum";
$sectionjoin = "LEFT JOIN {course_sections} cw ON cw.id = cm.section";
}
$sql = "SELECT cm.*, m.name, md.name AS modname $sectionfield
FROM {course_modules} cm
JOIN {modules} md ON md.id = cm.module
JOIN {".$modulename."} m ON m.id = cm.instance
$sectionjoin
WHERE cm.id = :cmid AND md.name = :modulename
$courseselect";
return $DB->get_record_sql($sql, $params, $strictness);
}
/**
* Given an instance number of a module, finds the coursemodule description
*
* @global object
* @param string $modulename name of module type, eg. resource, assignment,...
* @param int $instance module instance number (id in resource, assignment etc. table)
* @param int $courseid optional course id for extra validation
* @param bool $sectionnum include relative section number (0,1,2 ...)
* @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
* IGNORE_MULTIPLE means return first, ignore multiple records found(not recommended);
* MUST_EXIST means throw exception if no record or multiple records found
* @return stdClass
*/
function get_coursemodule_from_instance($modulename, $instance, $courseid=0, $sectionnum=false, $strictness=IGNORE_MISSING) {
global $DB;
$params = array('instance'=>$instance, 'modulename'=>$modulename);
$courseselect = "";
$sectionfield = "";
$sectionjoin = "";
if ($courseid) {
$courseselect = "AND cm.course = :courseid";
$params['courseid'] = $courseid;
}
if ($sectionnum) {
$sectionfield = ", cw.section AS sectionnum";
$sectionjoin = "LEFT JOIN {course_sections} cw ON cw.id = cm.section";
}
$sql = "SELECT cm.*, m.name, md.name AS modname $sectionfield
FROM {course_modules} cm
JOIN {modules} md ON md.id = cm.module
JOIN {".$modulename."} m ON m.id = cm.instance
$sectionjoin
WHERE m.id = :instance AND md.name = :modulename
$courseselect";
return $DB->get_record_sql($sql, $params, $strictness);
}
/**
* Returns all course modules of given activity in course
*
* @param string $modulename The module name (forum, quiz, etc.)
* @param int $courseid The course id to get modules for
* @param string $extrafields extra fields starting with m.
* @return array Array of results
*/
function get_coursemodules_in_course($modulename, $courseid, $extrafields='') {
global $DB;
if (!empty($extrafields)) {
$extrafields = ", $extrafields";
}
$params = array();
$params['courseid'] = $courseid;
$params['modulename'] = $modulename;
return $DB->get_records_sql("SELECT cm.*, m.name, md.name as modname $extrafields
FROM {course_modules} cm, {modules} md, {".$modulename."} m
WHERE cm.course = :courseid AND
cm.instance = m.id AND
md.name = :modulename AND
md.id = cm.module", $params);
}
/**
* Returns an array of all the active instances of a particular module in given courses, sorted in the order they are defined
*
* Returns an array of all the active instances of a particular
* module in given courses, sorted in the order they are defined
* in the course. Returns an empty array on any errors.
*
* The returned objects includle the columns cw.section, cm.visible,
* cm.groupmode and cm.groupingid, cm.groupmembersonly, and are indexed by cm.id.
*
* @global object
* @global object
* @param string $modulename The name of the module to get instances for
* @param array $courses an array of course objects.
* @param int $userid
* @param int $includeinvisible
* @return array of module instance objects, including some extra fields from the course_modules
* and course_sections tables, or an empty array if an error occurred.
*/
function get_all_instances_in_courses($modulename, $courses, $userid=NULL, $includeinvisible=false) {
global $CFG, $DB;
$outputarray = array();
if (empty($courses) || !is_array($courses) || count($courses) == 0) {
return $outputarray;
}
list($coursessql, $params) = $DB->get_in_or_equal(array_keys($courses), SQL_PARAMS_NAMED, 'c0');
$params['modulename'] = $modulename;
if (!$rawmods = $DB->get_records_sql("SELECT cm.id AS coursemodule, m.*, cw.section, cm.visible AS visible,
cm.groupmode, cm.groupingid, cm.groupmembersonly
FROM {course_modules} cm, {course_sections} cw, {modules} md,
{".$modulename."} m
WHERE cm.course $coursessql AND
cm.instance = m.id AND
cm.section = cw.id AND
md.name = :modulename AND
md.id = cm.module", $params)) {
return $outputarray;
}
foreach ($courses as $course) {
$modinfo = get_fast_modinfo($course, $userid);
if (empty($modinfo->instances[$modulename])) {
continue;
}
foreach ($modinfo->instances[$modulename] as $cm) {
if (!$includeinvisible and !$cm->uservisible) {
continue;
}
if (!isset($rawmods[$cm->id])) {
continue;
}
$instance = $rawmods[$cm->id];
if (!empty($cm->extra)) {
$instance->extra = $cm->extra;
}
$outputarray[] = $instance;
}
}
return $outputarray;
}
/**
* Returns an array of all the active instances of a particular module in a given course,
* sorted in the order they are defined.
*
* Returns an array of all the active instances of a particular
* module in a given course, sorted in the order they are defined
* in the course. Returns an empty array on any errors.
*
* The returned objects includle the columns cw.section, cm.visible,
* cm.groupmode and cm.groupingid, cm.groupmembersonly, and are indexed by cm.id.
*
* Simply calls {@link all_instances_in_courses()} with a single provided course
*
* @param string $modulename The name of the module to get instances for
* @param object $course The course obect.
* @return array of module instance objects, including some extra fields from the course_modules
* and course_sections tables, or an empty array if an error occurred.
* @param int $userid
* @param int $includeinvisible
*/
function get_all_instances_in_course($modulename, $course, $userid=NULL, $includeinvisible=false) {
return get_all_instances_in_courses($modulename, array($course->id => $course), $userid, $includeinvisible);
}
/**
* Determine whether a module instance is visible within a course
*
* Given a valid module object with info about the id and course,
* and the module's type (eg "forum") returns whether the object
* is visible or not, groupmembersonly visibility not tested
*
* @global object
* @param $moduletype Name of the module eg 'forum'
* @param $module Object which is the instance of the module
* @return bool Success
*/
function instance_is_visible($moduletype, $module) {
global $DB;
if (!empty($module->id)) {
$params = array('courseid'=>$module->course, 'moduletype'=>$moduletype, 'moduleid'=>$module->id);
if ($records = $DB->get_records_sql("SELECT cm.instance, cm.visible, cm.groupingid, cm.id, cm.groupmembersonly, cm.course
FROM {course_modules} cm, {modules} m
WHERE cm.course = :courseid AND
cm.module = m.id AND
m.name = :moduletype AND
cm.instance = :moduleid", $params)) {
foreach ($records as $record) { // there should only be one - use the first one
return $record->visible;
}
}
}
return true; // visible by default!
}
/**
* Determine whether a course module is visible within a course,
* this is different from instance_is_visible() - faster and visibility for user
*
* @global object
* @global object
* @uses DEBUG_DEVELOPER
* @uses CONTEXT_MODULE
* @uses CONDITION_MISSING_EXTRATABLE
* @param object $cm object
* @param int $userid empty means current user
* @return bool Success
*/
function coursemodule_visible_for_user($cm, $userid=0) {
global $USER,$CFG;
if (empty($cm->id)) {
debugging("Incorrect course module parameter!", DEBUG_DEVELOPER);
return false;
}
if (empty($userid)) {
$userid = $USER->id;
}
if (!$cm->visible and !has_capability('moodle/course:viewhiddenactivities', get_context_instance(CONTEXT_MODULE, $cm->id), $userid)) {
return false;
}
if ($CFG->enableavailability) {
require_once($CFG->libdir.'/conditionlib.php');
$ci=new condition_info($cm,CONDITION_MISSING_EXTRATABLE);
if(!$ci->is_available($cm->availableinfo,false,$userid) and
!has_capability('moodle/course:viewhiddenactivities',
get_context_instance(CONTEXT_MODULE, $cm->id), $userid)) {
return false;
}
}
return groups_course_module_visible($cm, $userid);
}
/// LOG FUNCTIONS /////////////////////////////////////////////////////
/**
* Add an entry to the log table.
*
* Add an entry to the log table. These are "action" focussed rather
* than web server hits, and provide a way to easily reconstruct what
* any particular student has been doing.
*
* @global object $DB
* @global object $CFG
* @global object $USER
* @uses SITEID
* @uses DEBUG_DEVELOPER
* @uses DEBUG_ALL
* @param int $courseid The course id
* @param string $module The module name e.g. forum, journal, resource, course, user etc
* @param string $action 'view', 'update', 'add' or 'delete', possibly followed by another word to clarify.
* @param string $url The file and parameters used to see the results of the action
* @param string $info Additional description information
* @param string $cm The course_module->id if there is one
* @param string $user If log regards $user other than $USER
* @return void
*/
function add_to_log($courseid, $module, $action, $url='', $info='', $cm=0, $user=0) {
// Note that this function intentionally does not follow the normal Moodle DB access idioms.
// This is for a good reason: it is the most frequently used DB update function,
// so it has been optimised for speed.
global $DB, $CFG, $USER;
if ($cm === '' || is_null($cm)) { // postgres won't translate empty string to its default
$cm = 0;
}
if ($user) {
$userid = $user;
} else {
if (session_is_loggedinas()) { // Don't log
return;
}
$userid = empty($USER->id) ? '0' : $USER->id;
}
if (isset($CFG->logguests) and !$CFG->logguests) {
if (!$userid or isguestuser($userid)) {
return;
}
}
$REMOTE_ADDR = getremoteaddr();
$timenow = time();
$info = $info;
if (!empty($url)) { // could break doing html_entity_decode on an empty var.
$url = html_entity_decode($url);
} else {
$url = '';
}
// Restrict length of log lines to the space actually available in the
// database so that it doesn't cause a DB error. Log a warning so that
// developers can avoid doing things which are likely to cause this on a
// routine basis.
$tl = textlib_get_instance();
if(!empty($info) && $tl->strlen($info)>255) {
$info = $tl->substr($info,0,252).'...';
debugging('Warning: logged very long info',DEBUG_DEVELOPER);
}
// If the 100 field size is changed, also need to alter print_log in course/lib.php
if(!empty($url) && $tl->strlen($url)>100) {
$url=$tl->substr($url,0,97).'...';
debugging('Warning: logged very long URL',DEBUG_DEVELOPER);
}
if (defined('MDL_PERFDB')) { global $PERF ; $PERF->logwrites++;};
$log = array('time'=>$timenow, 'userid'=>$userid, 'course'=>$courseid, 'ip'=>$REMOTE_ADDR, 'module'=>$module,
'cmid'=>$cm, 'action'=>$action, 'url'=>$url, 'info'=>$info);
try {
$DB->insert_record_raw('log', $log, false);
} catch (dml_exception $e) {
debugging('Error: Could not insert a new entry to the Moodle log', DEBUG_ALL);
// MDL-11893, alert $CFG->supportemail if insert into log failed
if ($CFG->supportemail and empty($CFG->noemailever)) {
// email_to_user is not usable because email_to_user tries to write to the logs table,
// and this will get caught in an infinite loop, if disk is full
$site = get_site();
$subject = 'Insert into log failed at your moodle site '.$site->fullname;
$message = "Insert into log table failed at ". date('l dS \of F Y h:i:s A') .".\n It is possible that your disk is full.\n\n";
$message .= "The failed query parameters are:\n\n" . var_export($log, true);
$lasttime = get_config('admin', 'lastloginserterrormail');
if(empty($lasttime) || time() - $lasttime > 60*60*24) { // limit to 1 email per day
//using email directly rather than messaging as they may not be able to log in to access a message
mail($CFG->supportemail, $subject, $message);
set_config('lastloginserterrormail', time(), 'admin');
}
}
}
}
/**
* Store user last access times - called when use enters a course or site
*
* @global object $USER
* @global object $CFG
* @global object $DB
* @uses LASTACCESS_UPDATE_SECS
* @uses SITEID
* @param int $courseid empty courseid means site
* @return void
*/
function user_accesstime_log($courseid=0) {
global $USER, $CFG, $DB;
if (!isloggedin() or session_is_loggedinas()) {
// no access tracking
return;
}
if (empty($courseid)) {
$courseid = SITEID;
}
$timenow = time();
/// Store site lastaccess time for the current user
if ($timenow - $USER->lastaccess > LASTACCESS_UPDATE_SECS) {
/// Update $USER->lastaccess for next checks
$USER->lastaccess = $timenow;
$last = new stdClass();
$last->id = $USER->id;
$last->lastip = getremoteaddr();
$last->lastaccess = $timenow;
$DB->update_record_raw('user', $last);
}
if ($courseid == SITEID) {
/// no user_lastaccess for frontpage
return;
}
/// Store course lastaccess times for the current user
if (empty($USER->currentcourseaccess[$courseid]) or ($timenow - $USER->currentcourseaccess[$courseid] > LASTACCESS_UPDATE_SECS)) {
$lastaccess = $DB->get_field('user_lastaccess', 'timeaccess', array('userid'=>$USER->id, 'courseid'=>$courseid));
if ($lastaccess === false) {
// Update course lastaccess for next checks
$USER->currentcourseaccess[$courseid] = $timenow;
$last = new stdClass();
$last->userid = $USER->id;
$last->courseid = $courseid;
$last->timeaccess = $timenow;
$DB->insert_record_raw('user_lastaccess', $last, false);
} else if ($timenow - $lastaccess < LASTACCESS_UPDATE_SECS) {
// no need to update now, it was updated recently in concurrent login ;-)
} else {
// Update course lastaccess for next checks
$USER->currentcourseaccess[$courseid] = $timenow;
$DB->set_field('user_lastaccess', 'timeaccess', $timenow, array('userid'=>$USER->id, 'courseid'=>$courseid));
}
}
}
/**
* Select all log records based on SQL criteria
*
* @global object $DB
* @param string $select SQL select criteria
* @param array $params named sql type params
* @param string $order SQL order by clause to sort the records returned
* @param string $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set)
* @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set)
* @param int $totalcount Passed in by reference.
* @return moodle_recordset instance
*/
function get_logs($select, array $params=null, $order='l.time DESC', $limitfrom='', $limitnum='', &$totalcount) {
global $DB;
if ($order) {
$order = "ORDER BY $order";
}
$selectsql = "";
$countsql = "";
if ($select) {
$select = "WHERE $select";
}
$sql = "SELECT COUNT(*)
FROM {log} l
$select";
$totalcount = $DB->count_records_sql($sql, $params);
$sql = "SELECT l.*, u.firstname, u.lastname, u.picture
FROM {log} l
LEFT JOIN {user} u ON l.userid = u.id
$select
$order";
return $DB->get_records_sql($sql, $params, $limitfrom, $limitnum) ;
}
/**
* Select all log records for a given course and user
*
* @global object $DB
* @uses DAYSECS
* @param int $userid The id of the user as found in the 'user' table.
* @param int $courseid The id of the course as found in the 'course' table.
* @param string $coursestart unix timestamp representing course start date and time.
* @return moodle_recordset instance
*/
function get_logs_usercourse($userid, $courseid, $coursestart) {
global $DB;
$params = array();
$courseselect = '';
if ($courseid) {
$courseselect = "AND course = :courseid";
$params['courseid'] = $courseid;
}
$params['userid'] = $userid;
$$coursestart = (int)$coursestart; // note: unfortunately pg complains if you use name parameter or column alias in GROUP BY
return $DB->get_records_sql("SELECT FLOOR((time - $coursestart)/". DAYSECS .") AS day, COUNT(*) AS num
FROM {log}
WHERE userid = :userid
AND time > $coursestart $courseselect
GROUP BY FLOOR((time - $coursestart)/". DAYSECS .")", $params);
}
/**
* Select all log records for a given course, user, and day
*
* @global object $DB
* @uses HOURSECS
* @param int $userid The id of the user as found in the 'user' table.
* @param int $courseid The id of the course as found in the 'course' table.
* @param string $daystart unix timestamp of the start of the day for which the logs needs to be retrived
* @return moodle_recordset instance
*/
function get_logs_userday($userid, $courseid, $daystart) {
global $DB;
$params = array('userid'=>$userid);
$courseselect = '';
if ($courseid) {
$courseselect = "AND course = :courseid";
$params['courseid'] = $courseid;
}
$daystart = (int)$daystart; // note: unfortunately pg complains if you use name parameter or column alias in GROUP BY
return $DB->get_records_sql("SELECT FLOOR((time - $daystart)/". HOURSECS .") AS hour, COUNT(*) AS num
FROM {log}
WHERE userid = :userid
AND time > $daystart $courseselect
GROUP BY FLOOR((time - $daystart)/". HOURSECS .") ", $params);
}
/**
* Returns an object with counts of failed login attempts
*
* Returns information about failed login attempts. If the current user is
* an admin, then two numbers are returned: the number of attempts and the
* number of accounts. For non-admins, only the attempts on the given user
* are shown.
*
* @global object $DB
* @uses CONTEXT_SYSTEM
* @param string $mode Either 'admin' or 'everybody'
* @param string $username The username we are searching for
* @param string $lastlogin The date from which we are searching
* @return int
*/
function count_login_failures($mode, $username, $lastlogin) {
global $DB;
$params = array('mode'=>$mode, 'username'=>$username, 'lastlogin'=>$lastlogin);
$select = "module='login' AND action='error' AND time > :lastlogin";
$count = new stdClass();
if (is_siteadmin()) {
if ($count->attempts = $DB->count_records_select('log', $select, $params)) {
$count->accounts = $DB->count_records_select('log', $select, $params, 'COUNT(DISTINCT info)');
return $count;
}
} else if ($mode == 'everybody') {
if ($count->attempts = $DB->count_records_select('log', "$select AND info = :username", $params)) {
return $count;
}
}
return NULL;
}
/// GENERAL HELPFUL THINGS ///////////////////////////////////
/**
* Dumps a given object's information for debugging purposes
*
* When used in a CLI script, the object's information is written to the standard
* error output stream. When used in a web script, the object is dumped to a
* pre-formatted block with the "notifytiny" CSS class.
*
* @param mixed $object The data to be printed
* @return void output is echo'd
*/
function print_object($object) {
// we may need a lot of memory here
raise_memory_limit(MEMORY_EXTRA);
if (CLI_SCRIPT) {
fwrite(STDERR, print_r($object, true));
fwrite(STDERR, PHP_EOL);
} else {
echo html_writer::tag('pre', s(print_r($object, true)), array('class' => 'notifytiny'));
}
}
/**
* This function is the official hook inside XMLDB stuff to delegate its debug to one
* external function.
*
* Any script can avoid calls to this function by defining XMLDB_SKIP_DEBUG_HOOK before
* using XMLDB classes. Obviously, also, if this function doesn't exist, it isn't invoked ;-)
*
* @uses DEBUG_DEVELOPER
* @param string $message string contains the error message
* @param object $object object XMLDB object that fired the debug
*/
function xmldb_debug($message, $object) {
debugging($message, DEBUG_DEVELOPER);
}
/**
* @global object
* @uses CONTEXT_COURSECAT
* @return boolean Whether the user can create courses in any category in the system.
*/
function user_can_create_courses() {
global $DB;
$catsrs = $DB->get_recordset('course_categories');
foreach ($catsrs as $cat) {
if (has_capability('moodle/course:create', get_context_instance(CONTEXT_COURSECAT, $cat->id))) {
$catsrs->close();
return true;
}
}
$catsrs->close();
return false;
}
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