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moodle/lib/conditionlib.php

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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/>.
/**
* Used for tracking conditions that apply before activities are displayed
* to students ('conditional availability').
*
* @package core_condition
* @category condition
* @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* CONDITION_STUDENTVIEW_HIDE - The activity is not displayed to students at all when conditions aren't met.
*/
define('CONDITION_STUDENTVIEW_HIDE', 0);
/**
* CONDITION_STUDENTVIEW_SHOW - The activity is displayed to students as a greyed-out name, with
* informational text that explains the conditions under which it will be available.
*/
define('CONDITION_STUDENTVIEW_SHOW', 1);
/**
* CONDITION_MISSING_NOTHING - The $item variable is expected to contain all completion-related data
*/
define('CONDITION_MISSING_NOTHING', 0);
/**
* CONDITION_MISSING_EXTRATABLE - The $item variable is expected to contain the fields from
* the relevant table (course_modules or course_sections) but not the _availability data
*/
define('CONDITION_MISSING_EXTRATABLE', 1);
/**
* CONDITION_MISSING_EVERYTHING - The $item variable is expected to contain nothing except the ID
*/
define('CONDITION_MISSING_EVERYTHING', 2);
/**
* OP_CONTAINS - comparison operator that determines whether a specified user field contains
* a provided variable
*/
define('OP_CONTAINS', 'contains');
/**
* OP_DOES_NOT_CONTAIN - comparison operator that determines whether a specified user field does not
* contain a provided variable
*/
define('OP_DOES_NOT_CONTAIN', 'doesnotcontain');
/**
* OP_IS_EQUAL_TO - comparison operator that determines whether a specified user field is equal to
* a provided variable
*/
define('OP_IS_EQUAL_TO', 'isequalto');
/**
* OP_STARTS_WITH - comparison operator that determines whether a specified user field starts with
* a provided variable
*/
define('OP_STARTS_WITH', 'startswith');
/**
* OP_ENDS_WITH - comparison operator that determines whether a specified user field ends with
* a provided variable
*/
define('OP_ENDS_WITH', 'endswith');
/**
* OP_IS_EMPTY - comparison operator that determines whether a specified user field is empty
*/
define('OP_IS_EMPTY', 'isempty');
/**
* OP_IS_NOT_EMPTY - comparison operator that determines whether a specified user field is not empty
*/
define('OP_IS_NOT_EMPTY', 'isnotempty');
require_once($CFG->libdir.'/completionlib.php');
/**
* Core class to handle conditional activites
*
* @package core_condition
* @category condition
* @copyright 2012 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class condition_info extends condition_info_base {
/**
* Constructs with course-module details.
*
* @global moodle_database $DB
* @uses CONDITION_MISSING_NOTHING
* @param object $cm Moodle course-module object. May have extra fields
* ->conditionsgrade, ->conditionscompletion which should come from
* get_fast_modinfo. Should have ->availablefrom, ->availableuntil,
* and ->showavailability, ->course, ->visible; but the only required
* thing is ->id.
* @param int $expectingmissing Used to control whether or not a developer
* debugging message (performance warning) will be displayed if some of
* the above data is missing and needs to be retrieved; a
* CONDITION_MISSING_xx constant
* @param bool $loaddata If you need a 'write-only' object, set this value
* to false to prevent database access from constructor
*/
public function __construct($cm, $expectingmissing = CONDITION_MISSING_NOTHING,
$loaddata=true) {
parent::__construct($cm, 'course_modules', 'coursemoduleid',
$expectingmissing, $loaddata);
}
/**
* Adds the extra availability conditions (if any) into the given
* course-module (or section) object.
*
* This function may be called statically (for the editing form) or
* dynamically.
*
* @param object $cm Moodle course-module data object
*/
public static function fill_availability_conditions($cm) {
parent::fill_availability_conditions_inner($cm, 'course_modules', 'coursemoduleid');
}
/**
* Gets the course-module object with full necessary data to determine availability.
* @return object Course-module object with full data
* @throws coding_exception If data was not supplied when constructing object
*/
public function get_full_course_module() {
return $this->get_full_item();
}
/**
* Utility function called by modedit.php; updates the
* course_modules_availability table based on the module form data.
*
* @param object $cm Course-module with as much data as necessary, min id
* @param object $fromform Data from form
* @param bool $wipefirst If true, wipes existing conditions
*/
public static function update_cm_from_form($cm, $fromform, $wipefirst=true) {
$ci = new condition_info($cm, CONDITION_MISSING_EVERYTHING, false);
parent::update_from_form($ci, $fromform, $wipefirst);
}
/**
* Used in course/lib.php because we need to disable the completion JS if
* a completion value affects a conditional activity.
*
* @global stdClass $CONDITIONLIB_PRIVATE
* @param object $course Moodle course object
* @param object $item Moodle course-module
* @return bool True if this is used in a condition, false otherwise
*/
public static function completion_value_used_as_condition($course, $cm) {
// Have we already worked out a list of required completion values
// for this course? If so just use that
global $CONDITIONLIB_PRIVATE, $DB;
if (!array_key_exists($course->id, $CONDITIONLIB_PRIVATE->usedincondition)) {
// We don't have data for this course, build it
$modinfo = get_fast_modinfo($course);
$CONDITIONLIB_PRIVATE->usedincondition[$course->id] = array();
// Activities
foreach ($modinfo->cms as $othercm) {
foreach ($othercm->conditionscompletion as $cmid => $expectedcompletion) {
$CONDITIONLIB_PRIVATE->usedincondition[$course->id][$cmid] = true;
}
}
// Sections
foreach ($modinfo->get_section_info_all() as $section) {
foreach ($section->conditionscompletion as $cmid => $expectedcompletion) {
$CONDITIONLIB_PRIVATE->usedincondition[$course->id][$cmid] = true;
}
}
}
return array_key_exists($cm->id, $CONDITIONLIB_PRIVATE->usedincondition[$course->id]);
}
}
/**
* Handles conditional access to sections.
*
* @package core_condition
* @category condition
* @copyright 2012 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class condition_info_section extends condition_info_base {
/**
* Constructs with course-module details.
*
* @global moodle_database $DB
* @uses CONDITION_MISSING_NOTHING
* @param object $section Moodle section object. May have extra fields
* ->conditionsgrade, ->conditionscompletion. Should have ->availablefrom,
* ->availableuntil, and ->showavailability, ->course; but the only
* required thing is ->id.
* @param int $expectingmissing Used to control whether or not a developer
* debugging message (performance warning) will be displayed if some of
* the above data is missing and needs to be retrieved; a
* CONDITION_MISSING_xx constant
* @param bool $loaddata If you need a 'write-only' object, set this value
* to false to prevent database access from constructor
*/
public function __construct($section, $expectingmissing = CONDITION_MISSING_NOTHING,
$loaddata=true) {
parent::__construct($section, 'course_sections', 'coursesectionid',
$expectingmissing, $loaddata);
}
/**
* Adds the extra availability conditions (if any) into the given
* course-module (or section) object.
*
* This function may be called statically (for the editing form) or
* dynamically.
*
* @param object $section Moodle section data object
*/
public static function fill_availability_conditions($section) {
parent::fill_availability_conditions_inner($section, 'course_sections', 'coursesectionid');
}
/**
* Gets the section object with full necessary data to determine availability.
* @return object Section object with full data
* @throws coding_exception If data was not supplied when constructing object
*/
public function get_full_section() {
return $this->get_full_item();
}
/**
* Gets list of required fields from main table.
* @return array Array of field names
*/
protected function get_main_table_fields() {
return array_merge(parent::get_main_table_fields(), array('groupingid'));
}
/**
* Determines whether this particular section is currently available
* according to these criteria.
*
* - This does not include the 'visible' setting (i.e. this might return
* true even if visible is false); visible is handled independently.
* - This does not take account of the viewhiddenactivities capability.
* That should apply later.
*
* @global moodle_database $DB
* @global stdclass $USER
* @param string $information If the item has availability restrictions,
* a string that describes the conditions will be stored in this variable;
* if this variable is set blank, that means don't display anything
* @param bool $grabthelot Performance hint: if true, caches information
* required for all course-modules, to make the front page and similar
* pages work more quickly (works only for current user)
* @param int $userid If set, specifies a different user ID to check availability for
* @param object $modinfo Usually leave as null for default. Specify when
* calling recursively from inside get_fast_modinfo. The value supplied
* here must include list of all CMs with 'id' and 'name'
* @return bool True if this item is available to the user, false otherwise
*/
public function is_available(&$information, $grabthelot=false, $userid=0, $modinfo=null) {
global $DB, $USER, $CONDITIONLIB_PRIVATE;
$available = parent::is_available($information, $grabthelot, $userid, $modinfo);
// test if user is enrolled to a grouping which has access to the section
if (!empty($this->item->groupingid)) {
// Get real user id
if (!$userid) {
$userid = $USER->id;
}
$context = context_course::instance($this->item->course);
if ($userid != $USER->id) {
// We are requesting for a non-current user so check it individually
// (no cache). Do grouping check first, it's probably faster
// than the capability check
$gotit = $DB->record_exists_sql('
SELECT
1
FROM
{groupings} g
JOIN {groupings_groups} gg ON g.id = gg.groupingid
JOIN {groups_members} gm ON gg.groupid = gm.groupid
WHERE
g.id = ? AND gm.userid = ?',
array($this->item->groupingid, $userid));
if (!$gotit && !has_capability('moodle/site:accessallgroups', $context, $userid)) {
$available = false;
$information .= get_string('groupingnoaccess', 'condition');
}
} else {
// Request is for current user - use cache
if( !array_key_exists($this->item->course, $CONDITIONLIB_PRIVATE->groupingscache)) {
if (has_capability('moodle/site:accessallgroups', $context)) {
$CONDITIONLIB_PRIVATE->groupingscache[$this->item->course] = true;
} else {
$groupings = $DB->get_records_sql('
SELECT
g.id as gid
FROM
{groupings} g
JOIN {groupings_groups} gg ON g.id = gg.groupingid
JOIN {groups_members} gm ON gg.groupid = gm.groupid
WHERE
g.courseid = ? AND gm.userid = ?',
array($this->item->course, $userid));
$list = array();
foreach ($groupings as $grouping) {
$list[$grouping->gid] = true;
}
$CONDITIONLIB_PRIVATE->groupingscache[$this->item->course] = $list;
}
}
$usergroupings = $CONDITIONLIB_PRIVATE->groupingscache[$this->item->course];
if ($usergroupings !== true && !array_key_exists($this->item->groupingid, $usergroupings)) {
$available = false;
$information .= get_string('groupingnoaccess', 'condition');
}
}
}
$information = trim($information);
return $available;
}
/**
* Utility function called by modedit.php; updates the
* course_modules_availability table based on the module form data.
*
* @param object $section Section object, must at minimum contain id
* @param object $fromform Data from form
* @param bool $wipefirst If true, wipes existing conditions
*/
public static function update_section_from_form($section, $fromform, $wipefirst=true) {
$ci = new condition_info_section($section, CONDITION_MISSING_EVERYTHING);
parent::update_from_form($ci, $fromform, $wipefirst);
}
}
/**
* Base class to handle conditional items of some kind (currently either
* course_modules or sections; they must have a corresponding _availability
* table).
*
* @package core_condition
* @category condition
* @copyright 2012 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class condition_info_base {
protected $item;
/** @var bool */
protected $gotdata;
/** @var string */
protected $availtable;
/** @var string */
protected $availfieldtable;
/** @var string */
protected $idfieldname;
/** @var array */
protected $usergroupings;
/** @var array An array of custom profile field ids => to their shortname */
protected $customprofilefields = null;
/**
* Constructs with item details.
*
* @global moodle_database $DB
* @uses CONDITION_MISSING_NOTHING
* @uses CONDITION_MISSING_EVERYTHING
* @uses CONDITION_MISSING_EXTRATABLE
* @uses DEBUG_DEVELOPER
* @param object $item Object representing some kind of item (cm or section).
* May have extra fields ->conditionsgrade, ->conditionscompletion.
* Should have ->availablefrom, ->availableuntil, and ->showavailability,
* ->course; but the only required thing is ->id.
* @param string $tableprefix Prefix for table used to store availability
* data, e.g. 'course_modules' if we are going to look at
* course_modules_availability.
* @param string $idfield Within this table, name of field used as item id
* (e.g. 'coursemoduleid')
* @param int $expectingmissing Used to control whether or not a developer
* debugging message (performance warning) will be displayed if some of
* the above data is missing and needs to be retrieved; a
* CONDITION_MISSING_xx constant
* @param bool $loaddata If you need a 'write-only' object, set this value
* to false to prevent database access from constructor
* @return condition_info Object which can retrieve information about the
* activity
*/
public function __construct($item, $tableprefix, $idfield, $expectingmissing, $loaddata) {
global $DB;
// Check ID as otherwise we can't do the other queries
if (empty($item->id)) {
throw new coding_exception('Invalid parameters; item ID not included');
}
// DB table to store availability conditions
$this->availtable = $tableprefix . '_availability';
// DB table to store availability conditions for user fields
$this->availfieldtable = $tableprefix . '_avail_fields';
// Name of module/section ID field in DB
$this->idfieldname = $idfield;
// If not loading data, don't do anything else
if (!$loaddata) {
$this->item = (object)array('id' => $item->id);
$this->gotdata = false;
return;
}
// Missing basic data from course_modules
$basicfields = $this->get_main_table_fields();
$missingbasicfields = false;
foreach ($basicfields as $field) {
if (!isset($item->{$field})) {
$missingbasicfields = true;
break;
}
}
if ($missingbasicfields) {
if ($expectingmissing<CONDITION_MISSING_EVERYTHING) {
debugging('Performance warning: condition_info constructor is ' .
'faster if you pass in $item with at least basic fields ' .
'from its table. '.
'[This warning can be disabled, see phpdoc.]',
DEBUG_DEVELOPER);
}
$item = $DB->get_record($tableprefix, array('id' => $item->id),
implode(',', $basicfields), MUST_EXIST);
}
$this->item = clone($item);
$this->gotdata = true;
// Missing extra data
if (!isset($item->conditionsgrade) || !isset($item->conditionscompletion) || !isset($item->conditionsfield)) {
if ($expectingmissing<CONDITION_MISSING_EXTRATABLE) {
debugging('Performance warning: condition_info constructor is ' .
'faster if you pass in a $item from get_fast_modinfo or ' .
'the equivalent for sections. ' .
'[This warning can be disabled, see phpdoc.]',
DEBUG_DEVELOPER);
}
$this->fill_availability_conditions($this->item);
}
}
/**
* Gets list of required fields from main table.
*
* @return array Array of field names
*/
protected function get_main_table_fields() {
return array('id', 'course', 'visible',
'availablefrom', 'availableuntil', 'showavailability');
}
/**
* Fills availability conditions into the item object, if they are missing,
* otherwise does nothing. Called by subclass fill_availability_conditions.
* @param object $item Item object
* @param string $tableprefix Prefix of name for _availability table e.g. 'course_modules'
* @param string $idfield Name of field that contains id e.g. 'coursemoduleid'
* @throws coding_exception If item object doesn't have id field
*/
protected static function fill_availability_conditions_inner($item, $tableprefix, $idfield) {
global $DB, $CFG;
if (empty($item->id)) {
throw new coding_exception('Invalid parameters; item ID not included');
}
// Does nothing if the variables are already present
if (!isset($item->conditionsgrade) || !isset($item->conditionscompletion) || !isset($item->conditionsfield)) {
$item->conditionsgrade = array();
$item->conditionscompletion = array();
$item->conditionsfield = array();
$conditions = $DB->get_records_sql('
SELECT
a.id AS aid, gi.*, a.sourcecmid, a.requiredcompletion, a.gradeitemid,
a.grademin as conditiongrademin, a.grademax as conditiongrademax
FROM
{' . $tableprefix . '_availability} a
LEFT JOIN {grade_items} gi ON gi.id = a.gradeitemid
WHERE ' . $idfield . ' = ?', array($item->id));
foreach ($conditions as $condition) {
if (!is_null($condition->sourcecmid)) {
$item->conditionscompletion[$condition->sourcecmid] =
$condition->requiredcompletion;
} else {
$minmax = new stdClass;
$minmax->min = $condition->conditiongrademin;
$minmax->max = $condition->conditiongrademax;
$minmax->name = self::get_grade_name($condition);
$item->conditionsgrade[$condition->gradeitemid] = $minmax;
}
}
// For user fields
$sql = "SELECT a.id as cmaid, a.*, uf.*
FROM {" . $tableprefix . "_avail_fields} a
LEFT JOIN {user_info_field} uf ON a.customfieldid = uf.id
WHERE " . $idfield . " = :itemid";
$conditions = $DB->get_records_sql($sql, array('itemid' => $item->id));
foreach ($conditions as $condition) {
// If the custom field is not empty, then we have a custom profile field
if (!empty($condition->customfieldid)) {
$field = $condition->customfieldid;
// Check if the profile field name is not empty, if it is
// then the custom profile field no longer exists, so
// display !missing instead.
if (!empty($condition->name)) {
$fieldname = $condition->name;
} else {
$fieldname = '!missing';
}
} else {
$field = $condition->userfield;
$fieldname = $condition->userfield;
}
$details = new stdClass;
$details->fieldname = $fieldname;
$details->operator = $condition->operator;
$details->value = $condition->value;
$item->conditionsfield[$field] = $details;
}
}
}
/**
* Obtains the name of a grade item.
*
* @global object $CFG
* @param object $gradeitemobj Object from get_record on grade_items table,
* (can be empty if you want to just get !missing)
* @return string Name of item of !missing if it didn't exist
*/
private static function get_grade_name($gradeitemobj) {
global $CFG;
if (isset($gradeitemobj->id)) {
require_once($CFG->libdir . '/gradelib.php');
$item = new grade_item;
grade_object::set_properties($item, $gradeitemobj);
return $item->get_name();
} else {
return '!missing'; // Ooops, missing grade
}
}
/**
* Gets the item object with full necessary data to determine availability.
* @return object Item object with full data
* @throws coding_exception If data was not supplied when constructing object
*/
protected function get_full_item() {
$this->require_data();
return $this->item;
}
/**
* The operators that provide the relationship
* between a field and a value.
*
* @return array Associative array from operator constant to display name
*/
public static function get_condition_user_field_operators() {
return array(
OP_CONTAINS => get_string('contains', 'condition'),
OP_DOES_NOT_CONTAIN => get_string('doesnotcontain', 'condition'),
OP_IS_EQUAL_TO => get_string('isequalto', 'condition'),
OP_STARTS_WITH => get_string('startswith', 'condition'),
OP_ENDS_WITH => get_string('endswith', 'condition'),
OP_IS_EMPTY => get_string('isempty', 'condition'),
OP_IS_NOT_EMPTY => get_string('isnotempty', 'condition'),
);
}
/**
* The user fields we can compare
*
* @global moodle_database $DB
* @return array Associative array from user field constants to display name
*/
public static function get_condition_user_fields() {
global $DB;
$userfields = array(
'firstname' => get_user_field_name('firstname'),
'lastname' => get_user_field_name('lastname'),
'email' => get_user_field_name('email'),
'city' => get_user_field_name('city'),
'country' => get_user_field_name('country'),
'interests' => get_user_field_name('interests'),
'url' => get_user_field_name('url'),
'icq' => get_user_field_name('icq'),
'skype' => get_user_field_name('skype'),
'aim' => get_user_field_name('aim'),
'yahoo' => get_user_field_name('yahoo'),
'msn' => get_user_field_name('msn'),
'idnumber' => get_user_field_name('idnumber'),
'institution' => get_user_field_name('institution'),
'department' => get_user_field_name('department'),
'phone1' => get_user_field_name('phone1'),
'phone2' => get_user_field_name('phone2'),
'address' => get_user_field_name('address')
);
// Go through the custom profile fields now
if ($user_info_fields = $DB->get_records('user_info_field')) {
foreach ($user_info_fields as $field) {
$userfields[$field->id] = $field->name;
}
}
return $userfields;
}
/**
* Adds to the database a condition based on completion of another module.
*
* @global moodle_database $DB
* @param int $cmid ID of other module
* @param int $requiredcompletion COMPLETION_xx constant
*/
public function add_completion_condition($cmid, $requiredcompletion) {
global $DB;
// Add to DB
$DB->insert_record($this->availtable, (object)array(
$this->idfieldname => $this->item->id,
'sourcecmid' => $cmid, 'requiredcompletion' => $requiredcompletion),
false);
// Store in memory too
$this->item->conditionscompletion[$cmid] = $requiredcompletion;
}
/**
* Adds user fields condition
*
* @param mixed $field numeric if it is a user profile field, character
* if it is a column in the user table
* @param int $operator specifies the relationship between field and value
* @param char $value the value of the field
*/
public function add_user_field_condition($field, $operator, $value) {
global $DB;
// Get the field name
$idfieldname = $this->idfieldname;
$objavailfield = new stdClass;
$objavailfield->$idfieldname = $this->item->id;
if (is_numeric($field)) { // If the condition field is numeric then it is a custom profile field
// Need to get the field name so we can add it to the cache
$ufield = $DB->get_field('user_info_field', 'name', array('id' => $field));
$objavailfield->fieldname = $ufield;
$objavailfield->customfieldid = $field;
} else {
$objavailfield->fieldname = $field;
$objavailfield->userfield = $field;
}
$objavailfield->operator = $operator;
$objavailfield->value = $value;
$DB->insert_record($this->availfieldtable, $objavailfield, false);
// Store in memory too
$this->item->conditionsfield[$field] = $objavailfield;
}
/**
* Adds to the database a condition based on the value of a grade item.
*
* @global moodle_database $DB
* @param int $gradeitemid ID of grade item
* @param float $min Minimum grade (>=), up to 5 decimal points, or null if none
* @param float $max Maximum grade (<), up to 5 decimal points, or null if none
* @param bool $updateinmemory If true, updates data in memory; otherwise,
* memory version may be out of date (this has performance consequences,
* so don't do it unless it really needs updating)
*/
public function add_grade_condition($gradeitemid, $min, $max, $updateinmemory=false) {
global $DB;
// Normalise nulls
if ($min==='') {
$min = null;
}
if ($max==='') {
$max = null;
}
// Add to DB
$DB->insert_record($this->availtable, (object)array(
$this->idfieldname => $this->item->id,
'gradeitemid' => $gradeitemid, 'grademin' => $min, 'grademax' => $max),
false);
// Store in memory too
if ($updateinmemory) {
$this->item->conditionsgrade[$gradeitemid] = (object) array(
'min' => $min, 'max' => $max);
$this->item->conditionsgrade[$gradeitemid]->name = self::get_grade_name(
$DB->get_record('grade_items', array('id'=>$gradeitemid)));
}
}
/**
* Erases from the database all conditions for this activity.
*
* @global moodle_database $DB
*/
public function wipe_conditions() {
// Wipe from DB
global $DB;
$DB->delete_records($this->availtable, array($this->idfieldname => $this->item->id));
$DB->delete_records($this->availfieldtable, array($this->idfieldname => $this->item->id));
// And from memory
$this->item->conditionsgrade = array();
$this->item->conditionscompletion = array();
$this->item->conditionsfield = array();
}
/**
* Obtains a string describing all availability restrictions (even if
* they do not apply any more).
*
* @global stdClass $COURSE
* @global moodle_database $DB
* @param object $modinfo Usually leave as null for default. Specify when
* calling recursively from inside get_fast_modinfo. The value supplied
* here must include list of all CMs with 'id' and 'name'
* @return string Information string (for admin) about all restrictions on
* this item
*/
public function get_full_information($modinfo=null) {
global $COURSE, $DB;
$this->require_data();
$information = '';
// Completion conditions
if (count($this->item->conditionscompletion) > 0) {
if ($this->item->course == $COURSE->id) {
$course = $COURSE;
} else {
$course = $DB->get_record('course', array('id' => $this->item->course),
'id, enablecompletion, modinfo', MUST_EXIST);
}
foreach ($this->item->conditionscompletion as $cmid => $expectedcompletion) {
if (!$modinfo) {
$modinfo = get_fast_modinfo($course);
}
if (empty($modinfo->cms[$cmid])) {
continue;
}
$information .= get_string(
'requires_completion_' . $expectedcompletion,
'condition', $modinfo->cms[$cmid]->name) . ' ';
}
}
// Grade conditions
if (count($this->item->conditionsgrade) > 0) {
foreach ($this->item->conditionsgrade as $gradeitemid => $minmax) {
// String depends on type of requirement. We are coy about
// the actual numbers, in case grades aren't released to
// students.
if (is_null($minmax->min) && is_null($minmax->max)) {
$string = 'any';
} else if (is_null($minmax->max)) {
$string = 'min';
} else if (is_null($minmax->min)) {
$string = 'max';
} else {
$string = 'range';
}
$information .= get_string('requires_grade_'.$string, 'condition', $minmax->name).' ';
}
}
// User field conditions
if (count($this->item->conditionsfield) > 0) {
// Need the array of operators
foreach ($this->item->conditionsfield as $field => $details) {
$a = new stdclass;
$a->field = $details->fieldname;
$a->value = $details->value;
$information .= get_string('requires_user_field_'.$details->operator, 'condition', $a) . ' ';
}
}
// The date logic is complicated. The intention of this logic is:
// 1) display date without time where possible (whenever the date is
// midnight)
// 2) when the 'until' date is e.g. 00:00 on the 14th, we display it as
// 'until the 13th' (experience at the OU showed that students are
// likely to interpret 'until <date>' as 'until the end of <date>').
// 3) This behaviour becomes confusing for 'same-day' dates where there
// are some exceptions.
// Users in different time zones will typically not get the 'abbreviated'
// behaviour but it should work OK for them aside from that.
// The following cases are possible:
// a) From 13:05 on 14 Oct until 12:10 on 17 Oct (exact, exact)
// b) From 14 Oct until 12:11 on 17 Oct (midnight, exact)
// c) From 13:05 on 14 Oct until 17 Oct (exact, midnight 18 Oct)
// d) From 14 Oct until 17 Oct (midnight 14 Oct, midnight 18 Oct)
// e) On 14 Oct (midnight 14 Oct, midnight 15 Oct)
// f) From 13:05 on 14 Oct until 0:00 on 15 Oct (exact, midnight, same day)
// g) From 0:00 on 14 Oct until 12:05 on 14 Oct (midnight, exact, same day)
// h) From 13:05 on 14 Oct (exact)
// i) From 14 Oct (midnight)
// j) Until 13:05 on 14 Oct (exact)
// k) Until 14 Oct (midnight 15 Oct)
// Check if start and end dates are 'midnights', if so we show in short form
$shortfrom = self::is_midnight($this->item->availablefrom);
$shortuntil = self::is_midnight($this->item->availableuntil);
// For some checks and for display, we need the previous day for the 'until'
// value, if we are going to display it in short form
if ($this->item->availableuntil) {
$daybeforeuntil = strtotime('-1 day', usergetmidnight($this->item->availableuntil));
}
// Special case for if one but not both are exact and they are within a day
if ($this->item->availablefrom && $this->item->availableuntil &&
$shortfrom != $shortuntil && $daybeforeuntil < $this->item->availablefrom) {
// Don't use abbreviated version (see examples f, g above)
$shortfrom = false;
$shortuntil = false;
}
// When showing short end date, the display time is the 'day before' one
$displayuntil = $shortuntil ? $daybeforeuntil : $this->item->availableuntil;
if ($this->item->availablefrom && $this->item->availableuntil) {
if ($shortfrom && $shortuntil && $daybeforeuntil == $this->item->availablefrom) {
$information .= get_string('requires_date_both_single_day', 'condition',
self::show_time($this->item->availablefrom, true));
} else {
$information .= get_string('requires_date_both', 'condition', (object)array(
'from' => self::show_time($this->item->availablefrom, $shortfrom),
'until' => self::show_time($displayuntil, $shortuntil)));
}
} else if ($this->item->availablefrom) {
$information .= get_string('requires_date', 'condition',
self::show_time($this->item->availablefrom, $shortfrom));
} else if ($this->item->availableuntil) {
$information .= get_string('requires_date_before', 'condition',
self::show_time($displayuntil, $shortuntil));
}
$information = trim($information);
return $information;
}
/**
* Checks whether a given time refers exactly to midnight (in current user
* timezone).
*
* @param int $time Time
* @return bool True if time refers to midnight, false if it's some other
* time or if it is set to zero
*/
private static function is_midnight($time) {
return $time && usergetmidnight($time) == $time;
}
/**
* Determines whether this particular item is currently available
* according to these criteria.
*
* - This does not include the 'visible' setting (i.e. this might return
* true even if visible is false); visible is handled independently.
* - This does not take account of the viewhiddenactivities capability.
* That should apply later.
*
* @global stdClass $COURSE
* @global moodle_database $DB
* @uses COMPLETION_COMPLETE
* @uses COMPLETION_COMPLETE_FAIL
* @uses COMPLETION_COMPLETE_PASS
* @param string $information If the item has availability restrictions,
* a string that describes the conditions will be stored in this variable;
* if this variable is set blank, that means don't display anything
* @param bool $grabthelot Performance hint: if true, caches information
* required for all course-modules, to make the front page and similar
* pages work more quickly (works only for current user)
* @param int $userid If set, specifies a different user ID to check availability for
* @param object $modinfo Usually leave as null for default. Specify when
* calling recursively from inside get_fast_modinfo. The value supplied
* here must include list of all CMs with 'id' and 'name'
* @return bool True if this item is available to the user, false otherwise
*/
public function is_available(&$information, $grabthelot=false, $userid=0, $modinfo=null) {
global $COURSE, $DB;
$this->require_data();
$available = true;
$information = '';
// Check each completion condition
if (count($this->item->conditionscompletion) > 0) {
if ($this->item->course == $COURSE->id) {
$course = $COURSE;
} else {
$course = $DB->get_record('course', array('id' => $this->item->course),
'id, enablecompletion, modinfo', MUST_EXIST);
}
$completion = new completion_info($course);
foreach ($this->item->conditionscompletion as $cmid => $expectedcompletion) {
// If this depends on a deleted module, handle that situation
// gracefully.
if (!$modinfo) {
$modinfo = get_fast_modinfo($course);
}
if (empty($modinfo->cms[$cmid])) {
global $PAGE;
if (isset($PAGE) && strpos($PAGE->pagetype, 'course-view-')===0) {
debugging("Warning: activity {$this->cm->id} '{$this->cm->name}' has condition " .
"on deleted activity $cmid (to get rid of this message, edit the named activity)");
}
continue;
}
// The completion system caches its own data
$completiondata = $completion->get_data((object)array('id' => $cmid),
$grabthelot, $userid, $modinfo);
$thisisok = true;
if ($expectedcompletion==COMPLETION_COMPLETE) {
// 'Complete' also allows the pass, fail states
switch ($completiondata->completionstate) {
case COMPLETION_COMPLETE:
case COMPLETION_COMPLETE_FAIL:
case COMPLETION_COMPLETE_PASS:
break;
default:
$thisisok = false;
}
} else {
// Other values require exact match
if ($completiondata->completionstate!=$expectedcompletion) {
$thisisok = false;
}
}
if (!$thisisok) {
$available = false;
$information .= get_string(
'requires_completion_' . $expectedcompletion,
'condition', $modinfo->cms[$cmid]->name) . ' ';
}
}
}
// Check each grade condition
if (count($this->item->conditionsgrade)>0) {
foreach ($this->item->conditionsgrade as $gradeitemid => $minmax) {
$score = $this->get_cached_grade_score($gradeitemid, $grabthelot, $userid);
if ($score===false ||
(!is_null($minmax->min) && $score<$minmax->min) ||
(!is_null($minmax->max) && $score>=$minmax->max)) {
// Grade fail
$available = false;
// String depends on type of requirement. We are coy about
// the actual numbers, in case grades aren't released to
// students.
if (is_null($minmax->min) && is_null($minmax->max)) {
$string = 'any';
} else if (is_null($minmax->max)) {
$string = 'min';
} else if (is_null($minmax->min)) {
$string = 'max';
} else {
$string = 'range';
}
$information .= get_string('requires_grade_' . $string, 'condition', $minmax->name) . ' ';
}
}
}
// Check if user field condition
if (count($this->item->conditionsfield) > 0) {
foreach ($this->item->conditionsfield as $field => $details) {
$uservalue = $this->get_cached_user_profile_field($userid, $field);
if (!$this->is_field_condition_met($details->operator, $uservalue, $details->value)) {
// Set available to false
$available = false;
$a = new stdClass();
$a->field = $details->fieldname;
$a->value = $details->value;
$information .= get_string('requires_user_field_'.$details->operator, 'condition', $a) . ' ';
}
}
}
// Test dates
if ($this->item->availablefrom) {
if (time() < $this->item->availablefrom) {
$available = false;
$information .= get_string('requires_date', 'condition',
self::show_time($this->item->availablefrom,
self::is_midnight($this->item->availablefrom)));
}
}
if ($this->item->availableuntil) {
if (time() >= $this->item->availableuntil) {
$available = false;
// But we don't display any information about this case. This is
// because the only reason to set a 'disappear' date is usually
// to get rid of outdated information/clutter in which case there
// is no point in showing it...
// Note it would be nice if we could make it so that the 'until'
// date appears below the item while the item is still accessible,
// unfortunately this is not possible in the current system. Maybe
// later, or if somebody else wants to add it.
}
}
// If the item is marked as 'not visible' then we don't change the available
// flag (visible/available are treated distinctly), but we remove any
// availability info. If the item is hidden with the eye icon, it doesn't
// make sense to show 'Available from <date>' or similar, because even
// when that date arrives it will still not be available unless somebody
// toggles the eye icon.
if (!$this->item->visible) {
$information = '';
}
$information = trim($information);
return $available;
}
/**
* Shows a time either as a date or a full date and time, according to
* user's timezone.
*
* @param int $time Time
* @param bool $dateonly If true, uses date only
* @return string Date
*/
private function show_time($time, $dateonly) {
return userdate($time,
get_string($dateonly ? 'strftimedate' : 'strftimedatetime', 'langconfig'));
}
/**
* Checks whether availability information should be shown to normal users.
*
* @return bool True if information about availability should be shown to
* normal users
* @throws coding_exception If data wasn't loaded
*/
public function show_availability() {
$this->require_data();
return $this->item->showavailability;
}
/**
* Internal function cheks that data was loaded.
*
* @throws coding_exception If data wasn't loaded
*/
private function require_data() {
if (!$this->gotdata) {
throw new coding_exception('Error: cannot call when info was ' .
'constructed without data');
}
}
/**
* Obtains a grade score. Note that this score should not be displayed to
* the user, because gradebook rules might prohibit that. It may be a
* non-final score subject to adjustment later.
*
* @global stdClass $USER
* @global moodle_database $DB
* @global stdClass $SESSION
* @param int $gradeitemid Grade item ID we're interested in
* @param bool $grabthelot If true, grabs all scores for current user on
* this course, so that later ones come from cache
* @param int $userid Set if requesting grade for a different user (does
* not use cache)
* @return float Grade score as a percentage in range 0-100 (e.g. 100.0
* or 37.21), or false if user does not have a grade yet
*/
private function get_cached_grade_score($gradeitemid, $grabthelot=false, $userid=0) {
global $USER, $DB, $SESSION;
if ($userid==0 || $userid==$USER->id) {
// For current user, go via cache in session
if (empty($SESSION->gradescorecache) || $SESSION->gradescorecacheuserid!=$USER->id) {
$SESSION->gradescorecache = array();
$SESSION->gradescorecacheuserid = $USER->id;
}
if (!array_key_exists($gradeitemid, $SESSION->gradescorecache)) {
if ($grabthelot) {
// Get all grades for the current course
$rs = $DB->get_recordset_sql('
SELECT
gi.id,gg.finalgrade,gg.rawgrademin,gg.rawgrademax
FROM
{grade_items} gi
LEFT JOIN {grade_grades} gg ON gi.id=gg.itemid AND gg.userid=?
WHERE
gi.courseid = ?', array($USER->id, $this->item->course));
foreach ($rs as $record) {
$SESSION->gradescorecache[$record->id] =
is_null($record->finalgrade)
// No grade = false
? false
// Otherwise convert grade to percentage
: (($record->finalgrade - $record->rawgrademin) * 100) /
($record->rawgrademax - $record->rawgrademin);
}
$rs->close();
// And if it's still not set, well it doesn't exist (eg
// maybe the user set it as a condition, then deleted the
// grade item) so we call it false
if (!array_key_exists($gradeitemid, $SESSION->gradescorecache)) {
$SESSION->gradescorecache[$gradeitemid] = false;
}
} else {
// Just get current grade
$record = $DB->get_record('grade_grades', array(
'userid'=>$USER->id, 'itemid'=>$gradeitemid));
if ($record && !is_null($record->finalgrade)) {
$score = (($record->finalgrade - $record->rawgrademin) * 100) /
($record->rawgrademax - $record->rawgrademin);
} else {
// Treat the case where row exists but is null, same as
// case where row doesn't exist
$score = false;
}
$SESSION->gradescorecache[$gradeitemid]=$score;
}
}
return $SESSION->gradescorecache[$gradeitemid];
} else {
// Not the current user, so request the score individually
$record = $DB->get_record('grade_grades', array(
'userid'=>$userid, 'itemid'=>$gradeitemid));
if ($record && !is_null($record->finalgrade)) {
$score = (($record->finalgrade - $record->rawgrademin) * 100) /
($record->rawgrademax - $record->rawgrademin);
} else {
// Treat the case where row exists but is null, same as
// case where row doesn't exist
$score = false;
}
return $score;
}
}
/**
* Returns true if a field meets the required conditions, false otherwise.
*
* @param string $operator the requirement/condition
* @param string $uservalue the user's value
* @param string $value the value required
* @return boolean
*/
private function is_field_condition_met($operator, $uservalue, $value) {
if ($uservalue === false) {
// If the user value is false this is an instant fail.
// All user values come from the database as either data or the default.
// They will always be a string.
return false;
}
$fieldconditionmet = true;
// Just to be doubly sure it is a string.
$uservalue = (string)$uservalue;
switch($operator) {
case OP_CONTAINS: // contains
$pos = strpos($uservalue, $value);
if ($pos === false) {
$fieldconditionmet = false;
}
break;
case OP_DOES_NOT_CONTAIN: // does not contain
if (!empty($value)) {
$pos = strpos($uservalue, $value);
if ($pos !== false) {
$fieldconditionmet = false;
}
}
break;
case OP_IS_EQUAL_TO: // equal to
if ($value !== $uservalue) {
$fieldconditionmet = false;
}
break;
case OP_STARTS_WITH: // starts with
$length = strlen($value);
if ((substr($uservalue, 0, $length) !== $value)) {
$fieldconditionmet = false;
}
break;
case OP_ENDS_WITH: // ends with
$length = strlen($value);
$start = $length * -1; // negative
if (substr($uservalue, $start) !== $value) {
$fieldconditionmet = false;
}
break;
case OP_IS_EMPTY: // is empty
if (!empty($uservalue)) {
$fieldconditionmet = false;
}
break;
case OP_IS_NOT_EMPTY: // is not empty
if (empty($uservalue)) {
$fieldconditionmet = false;
}
break;
}
return $fieldconditionmet;
}
/**
* Return the value for a user's profile field
*
* @param int $userid set if requesting grade for a different user (does not use cache)
* @param int $fieldid the user profile field id
* @return string the user value, or false if user does not have a user field value yet
*/
private function get_cached_user_profile_field($userid, $fieldid) {
global $USER, $DB, $CFG;
if ($userid === 0) {
// Map out userid = 0 to the current user
$userid = $USER->id;
}
$iscurrentuser = $USER->id == $userid;
if (isguestuser($userid)) {
// Must be logged in and can't be the guest. (this should never happen anyway)
return false;
}
// Custom profile fields will be numeric, there are no numeric standard profile fields so this is not a problem.
$iscustomprofilefield = is_numeric($fieldid);
if ($iscustomprofilefield) {
// As its a custom profile field we need to map the id back to the actual field.
// We'll also preload all of the other custom profile fields just in case and ensure we have the
// default value available as well.
if ($this->customprofilefields === null) {
$this->customprofilefields = $DB->get_records('user_info_field', null, 'sortorder ASC, id ASC', 'id, shortname, defaultdata');
}
if (!array_key_exists($fieldid, $this->customprofilefields)) {
// No such field exists.
// This shouldn't normally happen but occur if things go wrong when deleting a custom profile field
// or when restoring a backup of a course with user profile field conditions.
return false;
}
$field = $this->customprofilefields[$fieldid]->shortname;
} else {
$field = $fieldid;
}
// If its the current user than most likely we will be able to get this information from $USER.
// If its a regular profile field then it should already be available, if not then we have a mega problem.
// If its a custom profile field then it should be available but may not be. If it is then we use the value
// available, otherwise we load all custom profile fields into a temp object and refer to that.
// Noting its not going be great for performance if we have to use the temp object as it involves loading the
// custom profile field API and classes.
if ($iscurrentuser) {
if (!$iscustomprofilefield) {
if (property_exists($USER, $field)) {
return $USER->{$field};
} else {
// Unknown user field. This should not happen.
throw new coding_exception('Requested user profile field does not exist');
}
}
// Checking if the custom profile fields are already available.
if (!isset($USER->profile)) {
// Drat! they're not. We need to use a temp object and load them.
// We don't use $USER as the profile fields are loaded into the object.
$user = new stdClass;
$user->id = $USER->id;
// This should ALWAYS be set, but just in case we check.
require_once($CFG->dirroot.'/user/profile/lib.php');
profile_load_custom_fields($user);
if (array_key_exists($field, $user->profile)) {
return $user->profile[$field];
}
} else if (array_key_exists($field, $USER->profile)) {
// Hurrah they're available, this is easy.
return $USER->profile[$field];
}
// The profile field doesn't exist.
return false;
} else {
// Loading for another user.
if ($iscustomprofilefield) {
// Fetch the data for the field. Noting we keep this query simple so that Database caching takes care of performance
// for us (this will likely be hit again).
// We are able to do this because we've already pre-loaded the custom fields.
$data = $DB->get_field('user_info_data', 'data', array('userid' => $userid, 'fieldid' => $fieldid), IGNORE_MISSING);
// If we have data return that, otherwise return the default.
if ($data !== false) {
return $data;
} else {
return $this->customprofilefields[$field]->defaultdata;
}
} else {
// Its a standard field, retrieve it from the user.
return $DB->get_field('user', $field, array('id' => $userid), MUST_EXIST);
}
}
return false;
}
/**
* For testing only. Wipes information cached in user session.
*
* @global stdClass $SESSION
*/
static function wipe_session_cache() {
global $SESSION;
unset($SESSION->gradescorecache);
unset($SESSION->gradescorecacheuserid);
unset($SESSION->userfieldcache);
unset($SESSION->userfieldcacheuserid);
}
/**
* Initialises the global cache
* @global stdClass $CONDITIONLIB_PRIVATE
*/
public static function init_global_cache() {
global $CONDITIONLIB_PRIVATE;
$CONDITIONLIB_PRIVATE = new stdClass;
$CONDITIONLIB_PRIVATE->usedincondition = array();
$CONDITIONLIB_PRIVATE->groupingscache = array();
}
/**
* Utility function that resets grade/completion conditions in table based
* in data from editing form.
*
* @param condition_info_base $ci Condition info
* @param object $fromform Data from form
* @param bool $wipefirst If true, wipes existing conditions
*/
protected static function update_from_form(condition_info_base $ci, $fromform, $wipefirst) {
if ($wipefirst) {
$ci->wipe_conditions();
}
foreach ($fromform->conditiongradegroup as $record) {
if($record['conditiongradeitemid']) {
$ci->add_grade_condition($record['conditiongradeitemid'],
unformat_float($record['conditiongrademin']), unformat_float($record['conditiongrademax']));
}
}
foreach ($fromform->conditionfieldgroup as $record) {
if($record['conditionfield']) {
$ci->add_user_field_condition($record['conditionfield'],
$record['conditionfieldoperator'],
$record['conditionfieldvalue']);
}
}
if(isset ($fromform->conditioncompletiongroup)) {
foreach($fromform->conditioncompletiongroup as $record) {
if($record['conditionsourcecmid']) {
$ci->add_completion_condition($record['conditionsourcecmid'],
$record['conditionrequiredcompletion']);
}
}
}
}
}
condition_info::init_global_cache();
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