<?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/>.
/**
* Code for handling and processing questions.
*
* This is code that is module independent, i.e., can be used by any module that
* uses questions, like quiz, lesson, etc.
* This script also loads the questiontype classes.
* Code for handling the editing of questions is in question/editlib.php
*
* @package core
* @subpackage questionbank
* @copyright 1999 onwards Martin Dougiamas and others {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
use core_question\local\bank\question_version_status;
use core_question\question_reference_manager;
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot . '/question/engine/lib.php');
require_once($CFG->dirroot . '/question/type/questiontypebase.php');
// CONSTANTS.
/**
* Constant determines the number of answer boxes supplied in the editing
* form for multiple choice and similar question types.
*/
define("QUESTION_NUMANS", 10);
/**
* Constant determines the number of answer boxes supplied in the editing
* form for multiple choice and similar question types to start with, with
* the option of adding QUESTION_NUMANS_ADD more answers.
*/
define("QUESTION_NUMANS_START", 3);
/**
* Constant determines the number of answer boxes to add in the editing
* form for multiple choice and similar question types when the user presses
* 'add form fields button'.
*/
define("QUESTION_NUMANS_ADD", 3);
/**
* Move one question type in a list of question types. If you try to move one element
* off of the end, nothing will change.
*
* @param array $sortedqtypes An array $qtype => anything.
* @param string $tomove one of the keys from $sortedqtypes
* @param integer $direction +1 or -1
* @return array an array $index => $qtype, with $index from 0 to n in order, and
* the $qtypes in the same order as $sortedqtypes, except that $tomove will
* have been moved one place.
*/
function question_reorder_qtypes($sortedqtypes, $tomove, $direction): array {
$neworder = array_keys($sortedqtypes);
// Find the element to move.
$key = array_search($tomove, $neworder);
if ($key === false) {
return $neworder;
}
// Work out the other index.
$otherkey = $key + $direction;
if (!isset($neworder[$otherkey])) {
return $neworder;
}
// Do the swap.
$swap = $neworder[$otherkey];
$neworder[$otherkey] = $neworder[$key];
$neworder[$key] = $swap;
return $neworder;
}
/**
* Save a new question type order to the config_plugins table.
*
* @param array $neworder An arra $index => $qtype. Indices should start at 0 and be in order.
* @param object $config get_config('question'), if you happen to have it around, to save one DB query.
*/
function question_save_qtype_order($neworder, $config = null): void {
if (is_null($config)) {
$config = get_config('question');
}
foreach ($neworder as $index => $qtype) {
$sortvar = $qtype . '_sortorder';
if (!isset($config->$sortvar) || $config->$sortvar != $index + 1) {
set_config($sortvar, $index + 1, 'question');
}
}
}
// FUNCTIONS.
/**
* Check if the question is used.
*
* @param array $questionids of question ids.
* @return boolean whether any of these questions are being used by any part of Moodle.
*/
function questions_in_use($questionids): bool {
// Are they used by the core question system?
if (question_engine::questions_in_use($questionids)) {
return true;
}
if (question_reference_manager::questions_with_references($questionids)) {
return true;
}
// Check if any plugins are using these questions.
$callbacksbytype = get_plugins_with_function('questions_in_use');
foreach ($callbacksbytype as $callbacks) {
foreach ($callbacks as $function) {
if ($function($questionids)) {
return true;
}
}
}
// Finally check legacy callback.
$legacycallbacks = get_plugin_list_with_function('mod', 'question_list_instances');
foreach ($legacycallbacks as $plugin => $function) {
debugging($plugin . ' implements deprecated method ' . $function .
'. ' . $plugin . '_questions_in_use should be implemented instead.', DEBUG_DEVELOPER);
if (isset($callbacksbytype['mod'][substr($plugin, 4)])) {
continue; // Already done.
}
foreach ($questionids as $questionid) {
if (!empty($function($questionid))) {
return true;
}
}
}
return false;
}
/**
* Determine whether there are any questions belonging to this context, that is whether any of its
* question categories contain any questions. This will return true even if all the questions are
* hidden.
*
* @param mixed $context either a context object, or a context id.
* @return boolean whether any of the question categories beloning to this context have
* any questions in them.
*/
function question_context_has_any_questions($context): bool {
global $DB;
if (is_object($context)) {
$contextid = $context->id;
} else if (is_numeric($context)) {
$contextid = $context;
} else {
throw new moodle_exception('invalidcontextinhasanyquestions', 'question');
}
$sql = 'SELECT qbe.*
FROM {question_bank_entries} qbe
JOIN {question_categories} qc ON qc.id = qbe.questioncategoryid
WHERE qc.contextid = ?';
return $DB->record_exists_sql($sql, [$contextid]);
}
/**
* Check whether a given grade is one of a list of allowed options. If not,
* depending on $matchgrades, either return the nearest match, or return false
* to signal an error.
*
* @param array $gradeoptionsfull list of valid options
* @param int $grade grade to be tested
* @param string $matchgrades 'error' or 'nearest'
* @return false|int|string either 'fixed' value or false if error.
*/
function match_grade_options($gradeoptionsfull, $grade, $matchgrades = 'error') {
if ($matchgrades == 'error') {
// ...(Almost) exact match, or an error.
foreach ($gradeoptionsfull as $value => $option) {
// Slightly fuzzy test, never check floats for equality.
if (abs($grade - $value) < 0.00001) {
return $value; // Be sure the return the proper value.
}
}
// Didn't find a match so that's an error.
return false;
} else if ($matchgrades == 'nearest') {
// Work out nearest value.
$best = false;
$bestmismatch = 2;
foreach ($gradeoptionsfull as $value => $option) {
$newmismatch = abs($grade - $value);
if ($newmismatch < $bestmismatch) {
$best = $value;
$bestmismatch = $newmismatch;
}
}
return $best;
} else {
// Unknow option passed.
throw new coding_exception('Unknown $matchgrades ' . $matchgrades .
' passed to match_grade_options');
}
}
/**
* Category is about to be deleted,
* 1/ All questions are deleted for this question category.
* 2/ Any questions that can't be deleted are moved to a new category
* NOTE: this function is called from lib/db/upgrade.php
*
* @param object|core_course_category $category course category object
* @param bool $coursedeletion Is the course this category is under being deleted? If so, move saved questions to the site course.
*/
function question_category_delete_safe($category, bool $coursedeletion = false): void {
global $DB;
$criteria = ['questioncategoryid' => $category->id];
$context = context::instance_by_id($category->contextid, IGNORE_MISSING);
$rescue = null; // See the code around the call to question_save_from_deletion.
// Deal with any questions in the category.
if ($questionentries = $DB->get_records('question_bank_entries', $criteria, '', 'id')) {
foreach ($questionentries as $questionentry) {
$questionids = $DB->get_records('question_versions',
['questionbankentryid' => $questionentry->id], '', 'questionid');
// Try to delete each question.
foreach ($questionids as $questionid) {
question_delete_question($questionid->questionid, $category->contextid);
}
}
// Check to see if there were any questions that were kept because
// they are still in use somehow, even though quizzes in courses
// in this category will already have been deleted. This could
// happen, for example, if questions are added to a course,
// and then that course is moved to another category (MDL-14802).
$questionids = [];
foreach ($questionentries as $questionentry) {
$versions = $DB->get_records('question_versions', ['questionbankentryid' => $questionentry->id], '', 'questionid');
foreach ($versions as $key => $version) {
$questionids[$key] = $version;
}
}
if (!empty($questionids)) {
$name = get_string('unknown', 'question');
if ($context !== false) {
$name = $context->get_context_name();
$parentcontext = $context->get_course_context(false);
$course = ($parentcontext && !$coursedeletion) ? get_course($parentcontext->instanceid) : get_site();
}
$qbank = core_question\local\bank\question_bank_helper::get_default_open_instance_system_type($course, true);
question_save_from_deletion(array_keys($questionids), $qbank->context->id, $name, $rescue);
}
}
// Now delete the category.
$DB->delete_records('question_categories', ['id' => $category->id]);
}
/**
* Tests whether any question in a category is used by any part of Moodle.
*
* @param integer $categoryid a question category id.
* @param boolean $recursive whether to check child categories too.
* @return boolean whether any question in this category is in use.
*/
function question_category_in_use($categoryid, $recursive = false): bool {
global $DB;
// Look at each question in the category.
$questionids = question_bank::get_finder()->get_questions_from_categories([$categoryid], null);
if ($questionids) {
if (questions_in_use(array_keys($questionids))) {
return true;
}
}
if (!$recursive) {
return false;
}
// Look under child categories recursively.
if ($children = $DB->get_records('question_categories',
['parent' => $categoryid], '', 'id, 1')) {
foreach ($children as $child) {
if (question_category_in_use($child->id, $recursive)) {
return true;
}
}
}
return false;
}
/**
* Check if there is more versions left for the entry.
* If not delete the entry.
*
* @param int $entryid
*/
function delete_question_bank_entry($entryid): void {
global $DB;
if (!$DB->record_exists('question_versions', ['questionbankentryid' => $entryid])) {
$DB->delete_records('question_bank_entries', ['id' => $entryid]);
}
}
/**
* Deletes question and all associated data from the database
*
* It will not delete a question if it is used somewhere, instead it will just delete the reference.
*
* @param int $questionid The id of the question being deleted
*/
function question_delete_question($questionid): void {
global $DB;
$question = $DB->get_record('question', ['id' => $questionid]);
if (!$question) {
// In some situations, for example if this was a child of a
// Cloze question that was previously deleted, the question may already
// have gone. In this case, just do nothing.
return;
}
$sql = 'SELECT qv.id as versionid,
qv.version,
qbe.id as entryid,
qc.id as categoryid,
ctx.id as contextid
FROM {question} q
LEFT JOIN {question_versions} qv ON qv.questionid = q.id
LEFT JOIN {question_bank_entries} qbe ON qbe.id = qv.questionbankentryid
LEFT JOIN {question_categories} qc ON qc.id = qbe.questioncategoryid
LEFT JOIN {context} ctx ON ctx.id = qc.contextid
WHERE q.id = ?';
$questiondata = $DB->get_record_sql($sql, [$question->id]);
$questionstocheck = [$question->id];
if ($question->parent) {
$questionstocheck[] = $question->parent;
}
// Do not delete a question if it is used by an activity module. Just mark the version hidden.
if (questions_in_use($questionstocheck)) {
$DB->set_field('question_versions', 'status',
question_version_status::QUESTION_STATUS_HIDDEN, ['questionid' => $questionid]);
return;
}
// This sometimes happens in old sites with bad data.
if (!$questiondata->contextid) {
debugging('Deleting question ' . $question->id . ' which is no longer linked to a context. ' .
'Assuming system context to avoid errors, but this may mean that some data like files, ' .
'tags, are not cleaned up.');
$questiondata->contextid = context_system::instance()->id;
$questiondata->categoryid = 0;
}
// Delete previews of the question.
$dm = new question_engine_data_mapper();
$dm->delete_previews($question->id);
// Delete questiontype-specific data.
question_bank::get_qtype($question->qtype, false)->delete_question($question->id, $questiondata->contextid);
// Now recursively delete all child questions
if ($children = $DB->get_records('question',
array('parent' => $questionid), '', 'id, qtype')) {
foreach ($children as $child) {
if ($child->id != $questionid) {
question_delete_question($child->id);
}
}
}
// Finally delete the question record itself.
$DB->delete_records('question', ['id' => $question->id]);
$DB->delete_records('question_versions', ['id' => $questiondata->versionid]);
$DB->delete_records('question_references',
[
'version' => $questiondata->version,
'questionbankentryid' => $questiondata->entryid,
]);
delete_question_bank_entry($questiondata->entryid);
question_bank::notify_question_edited($question->id);
// Log the deletion of this question.
// Any qbank plugins storing additional question data should observe this event and perform the necessary deletion.
$question->category = $questiondata->categoryid;
$question->contextid = $questiondata->contextid;
$event = \core\event\question_deleted::create_from_question_instance($question);
$event->add_record_snapshot('question', $question);
$event->trigger();
}
/**
* All question categories and their questions are deleted for this context id.
*
* @param int $contextid The contextid to delete question categories from
* @param bool $coursedeletion Are we calling this as part of deleting the course the context is under?
* @return array only returns an empty array for backwards compatibility.
*/
function question_delete_context($contextid, bool $coursedeletion = false): array {
global $DB;
$fields = 'id, parent, name, contextid';
if ($categories = $DB->get_records('question_categories', ['contextid' => $contextid], 'parent', $fields)) {
// Sort categories following their tree (parent-child) relationships this will make the feedback more readable.
$categories = sort_categories_by_tree($categories);
foreach ($categories as $category) {
question_category_delete_safe($category, $coursedeletion);
}
}
return [];
}
/**
* Creates a new category to save the questions in use.
*
* @param array $questionids of question ids
* @param int $newcontextid the context to create the saved category in.
* @param string $oldplace a textual description of the think being deleted,
* e.g. from get_context_name
* @param object $newcategory
* @return mixed false on
*/
function question_save_from_deletion($questionids, $newcontextid, $oldplace, $newcategory = null) {
global $DB;
$newcontext = context::instance_by_id($newcontextid);
if ($newcontext->contextlevel !== CONTEXT_MODULE) {
throw new moodle_exception("Invalid contextlevel: {$newcontext->contextlevel} for \$newcontextid {$newcontextid}");
}
// Make a category in the parent context to move the questions to.
if (is_null($newcategory)) {
$newcategory = new stdClass();
$newcategory->parent = question_get_top_category($newcontextid, true)->id;
$newcategory->contextid = $newcontextid;
// Max length of column name in question_categories is 255.
$newcategory->name = shorten_text(get_string('questionsrescuedfrom', 'question', $oldplace), 255);
$newcategory->info = get_string('questionsrescuedfrominfo', 'question', $oldplace);
$newcategory->sortorder = 999;
$newcategory->stamp = make_unique_id_code();
$newcategory->id = $DB->insert_record('question_categories', $newcategory);
}
// Move any remaining questions to the 'saved' category.
if (!question_move_questions_to_category($questionids, $newcategory->id)) {
return false;
}
return $newcategory;
}
/**
* All question categories and their questions are deleted for this activity.
*
* @param object $cm the course module object representing the activity
* @param bool $notused the argument is not used any more. Kept for backwards compatibility.
* @param bool $coursedeletion Are we calling this as part of deleting the course the activity belongs to?
* @return boolean
*/
function question_delete_activity($cm, $notused = false, bool $coursedeletion = false): bool {
$modcontext = context_module::instance($cm->id);
question_delete_context($modcontext->id, $coursedeletion);
return true;
}
/**
* This function will handle moving all tag instances to a new context for a
* given list of questions.
*
* @param stdClass[] $questions The list of question being moved (must include
* the id and contextid)
* @param context $newcontext The Moodle context the questions are being moved to, must be module context.
*/
function question_move_question_tags_to_new_context(array $questions, context $newcontext): void {
if ($newcontext->contextlevel !== CONTEXT_MODULE) {
debugging("Invalid contextlevel: {$newcontext->contextlevel}", DEBUG_DEVELOPER);
}
$instancesfornewcontext = [];
$questionids = array_map(function($question) {
return $question->id;
}, $questions);
$questionstagobjects = core_tag_tag::get_items_tags('core_question', 'question', $questionids);
foreach ($questions as $question) {
$tagobjects = $questionstagobjects[$question->id] ?? [];
foreach ($tagobjects as $tagobject) {
$tagid = $tagobject->taginstanceid;
$tagcontextid = $tagobject->taginstancecontextid;
$istaginnewcontext = $tagcontextid == $newcontext->id;
if ($istaginnewcontext) {
// This tag instance is already in the correct context so we can
// ignore it.
continue;
}
$instancesfornewcontext[] = $tagid;
}
}
if (!empty($instancesfornewcontext)) {
// Update the tag instances to the new context id.
core_tag_tag::change_instances_context($instancesfornewcontext, $newcontext);
}
}
/**
* Check if an idnumber exist in the category.
*
* @param int $questionidnumber
* @param int $categoryid
* @param int $limitfrom
* @param int $limitnum
* @return array
*/
function idnumber_exist_in_question_category($questionidnumber, $categoryid, $limitfrom = 0, $limitnum = 1): array {
global $DB;
$response = false;
$record = [];
// Check if the idnumber exist in the category.
$sql = 'SELECT qbe.idnumber
FROM {question_bank_entries} qbe
WHERE qbe.idnumber LIKE ?
AND qbe.questioncategoryid = ?
ORDER BY qbe.idnumber DESC';
$questionrecord = $DB->record_exists_sql($sql, [$questionidnumber, $categoryid]);
if ((string) $questionidnumber !== '' && $questionrecord) {
$record = $DB->get_records_sql($sql, [$questionidnumber . '_%', $categoryid], 0, 1);
$response = true;
}
return [$response, $record];
}
/**
* This function should be considered private to the question bank, it is called from
* question/editlib.php question/contextmoveq.php and a few similar places to to the
* work of actually moving questions and associated data. However, callers of this
* function also have to do other work, which is why you should not call this method
* directly from outside the questionbank.
*
* @param array $questionids of question ids.
* @param integer $newcategoryid the id of the category to move to.
* @return bool
*/
function question_move_questions_to_category($questionids, $newcategoryid): bool {
global $DB;
$newcategorydata = $DB->get_record('question_categories', ['id' => $newcategoryid]);
if (!$newcategorydata) {
return false;
}
list($questionidcondition, $params) = $DB->get_in_or_equal($questionids);
$sql = "SELECT qv.id as versionid,
qbe.id as entryid,
qc.id as category,
qc.contextid as contextid,
q.id,
q.qtype,
qbe.idnumber
FROM {question} q
JOIN {question_versions} qv ON qv.questionid = q.id
JOIN {question_bank_entries} qbe ON qbe.id = qv.questionbankentryid
JOIN {question_categories} qc ON qc.id = qbe.questioncategoryid
WHERE q.id $questionidcondition
OR (q.parent <> 0 AND q.parent $questionidcondition)";
// Also, we need to move children questions.
$params = array_merge($params, $params);
$questions = $DB->get_records_sql($sql, $params);
foreach ($questions as $question) {
if ($newcategorydata->contextid != $question->contextid) {
question_bank::get_qtype($question->qtype)->move_files(
$question->id, $question->contextid, $newcategorydata->contextid);
}
// Check whether there could be a clash of idnumbers in the new category.
list($idnumberclash, $rec) = idnumber_exist_in_question_category($question->idnumber, $newcategoryid);
if ($idnumberclash) {
$unique = 1;
if (count($rec)) {
$rec = reset($rec);
$idnumber = $rec->idnumber;
if (strpos($idnumber, '_') !== false) {
$unique = substr($idnumber, strpos($idnumber, '_') + 1) + 1;
}
}
// For the move process, add a numerical increment to the idnumber. This means that if a question is
// mistakenly moved then the idnumber will not be completely lost.
$qbankentry = new stdClass();
$qbankentry->id = $question->entryid;
$qbankentry->idnumber = $question->idnumber . '_' . $unique;
$DB->update_record('question_bank_entries', $qbankentry);
}
// Update the entry to the new category id.
$entry = new stdClass();
$entry->id = $question->entryid;
$entry->questioncategoryid = $newcategorydata->id;
$DB->update_record('question_bank_entries', $entry);
// Log this question move.
$event = \core\event\question_moved::create_from_question_instance($question, context::instance_by_id($question->contextid),
['oldcategoryid' => $question->category, 'newcategoryid' => $newcategorydata->id]);
$event->trigger();
}
$newcontext = context::instance_by_id($newcategorydata->contextid);
question_move_question_tags_to_new_context($questions, $newcontext);
// TODO Deal with datasets.
// Purge these questions from the cache.
foreach ($questions as $question) {
question_bank::notify_question_edited($question->id);
}
return true;
}
/**
* Update the questioncontextid field for all question_set_references records given a new context id
*
* @param int $oldcategoryid Old category to be moved.
* @param int $newcatgoryid New category that will receive the questions.
* @param int $oldcontextid Old context to be moved.
* @param int $newcontextid New context that will receive the questions.
* @param bool $delete If the action is delete.
* @throws dml_exception
*/
function move_question_set_references(int $oldcategoryid, int $newcatgoryid,
int $oldcontextid, int $newcontextid, bool $delete = false): void {
global $DB;
if ($delete || $oldcontextid !== $newcontextid) {
$setreferences = $DB->get_recordset('question_set_references', ['questionscontextid' => $oldcontextid]);
foreach ($setreferences as $setreference) {
$filter = json_decode($setreference->filtercondition, true);
if (isset($filter['questioncategoryid'])) {
$filter = question_reference_manager::convert_legacy_set_reference_filter_condition($filter);
}
$setreference->questionscontextid = $newcontextid;
if (
(int)$filter['filter']['category']['values'][0] === $oldcategoryid
&& $oldcategoryid !== $newcatgoryid
) {
$filter['filter']['category']['values'][0] = $newcatgoryid;
$setreference->filtercondition = json_encode($filter);
}
$DB->update_record('question_set_references', $setreference);
}
$setreferences->close();
}
}
/**
* This function helps move a question cateogry to a new context by moving all
* the files belonging to all the questions to the new context.
* Also moves subcategories.
* @param integer $categoryid the id of the category being moved.
* @param integer $oldcontextid the old context id.
* @param integer $newcontextid the new context id.
*/
function question_move_category_to_context($categoryid, $oldcontextid, $newcontextid): void {
global $DB;
$newcontext = context::instance_by_id($newcontextid);
if ($newcontext->contextlevel !== CONTEXT_MODULE) {
debugging("Invalid contextlevel: {$newcontext->contextlevel}, must use CONTEXT_MODULE", DEBUG_DEVELOPER);
}
$questions = [];
$sql = "SELECT q.id, q.qtype
FROM {question} q
JOIN {question_versions} qv ON qv.questionid = q.id
JOIN {question_bank_entries} qbe ON qbe.id = qv.questionbankentryid
WHERE qbe.questioncategoryid = ?";
$questionids = $DB->get_records_sql_menu($sql, [$categoryid]);
foreach ($questionids as $questionid => $qtype) {
// If the question type is invalid, use "missingtype" so we have a valid qtype to call move_files() on.
if (!\question_bank::is_qtype_installed($qtype)) {
$qtype = 'missingtype';
}
question_bank::get_qtype($qtype)->move_files($questionid, $oldcontextid, $newcontextid);
// Purge this question from the cache.
question_bank::notify_question_edited($questionid);
$questions[] = (object) [
'id' => $questionid,
'contextid' => $oldcontextid
];
}
question_move_question_tags_to_new_context($questions, $newcontext);
$subcatids = $DB->get_records_menu('question_categories', ['parent' => $categoryid], '', 'id,1');
foreach ($subcatids as $subcatid => $notused) {
move_question_set_references($subcatid, $subcatid, $oldcontextid, $newcontext->id);
$DB->set_field('question_categories', 'contextid', $newcontextid, ['id' => $subcatid]);
question_move_category_to_context($subcatid, $oldcontextid, $newcontextid);
}
}
/**
* Given a list of ids, load the basic information about a set of questions from
* the questions table. The $join and $extrafields arguments can be used together
* to pull in extra data. See, for example, the usage in {@see \mod_quiz\quiz_attempt}, and
* read the code below to see how the SQL is assembled. Throws exceptions on error.
*
* @param array $questionids array of question ids to load. If null, then all
* questions matched by $join will be loaded.
* @param string $extrafields extra SQL code to be added to the query.
* @param string $join extra SQL code to be added to the query.
* @param array $extraparams values for any placeholders in $join.
* You must use named placeholders.
* @param string $orderby what to order the results by. Optional, default is unspecified order.
*
* @return array partially complete question objects. You need to call get_question_options
* on them before they can be properly used.
*/
function question_preload_questions($questionids = null, $extrafields = '', $join = '', $extraparams = [], $orderby = ''): array {
global $DB;
if ($questionids === null) {
$extracondition = '';
$params = [];
} else {
if (empty($questionids)) {
return [];
}
list($questionidcondition, $params) = $DB->get_in_or_equal($questionids, SQL_PARAMS_NAMED, 'qid0000');
$extracondition = 'WHERE q.id ' . $questionidcondition;
}
if ($join) {
$join = 'JOIN ' . $join;
}
if ($extrafields) {
$extrafields = ', ' . $extrafields;
}
if ($orderby) {
$orderby = 'ORDER BY ' . $orderby;
}
$sql = "SELECT q.*,
qc.id as category,
qv.status,
qv.id as versionid,
qv.version,
qv.questionbankentryid,
qc.contextid as contextid
{$extrafields}
FROM {question} q
JOIN {question_versions} qv
ON qv.questionid = q.id
JOIN {question_bank_entries} qbe
ON qbe.id = qv.questionbankentryid
JOIN {question_categories} qc
ON qc.id = qbe.questioncategoryid
{$join}
{$extracondition}
{$orderby}";
// Load the questions.
$questions = $DB->get_records_sql($sql, $extraparams + $params);
foreach ($questions as $question) {
$question->_partiallyloaded = true;
}
return $questions;
}
/**
* Load a set of questions, given a list of ids. The $join and $extrafields arguments can be used
* together to pull in extra data. See, for example, the usage in mod/quiz/attempt.php, and
* read the code below to see how the SQL is assembled. Throws exceptions on error.
*
* @param array $questionids array of question ids.
* @param string $extrafields extra SQL code to be added to the query.
* @param string $join extra SQL code to be added to the query.
* @return array|string question objects.
*/
function question_load_questions($questionids, $extrafields = '', $join = '') {
$questions = question_preload_questions($questionids, $extrafields, $join);
// Load the question type specific information.
if (!get_question_options($questions)) {
return get_string('questionloaderror', 'question');
}
return $questions;
}
/**
* Private function to factor common code out of get_question_options().
*
* @param object $question the question to tidy.
* @param stdClass $category The question_categories record for the given $question.
* @param \core_tag_tag[]|null $tagobjects The tags for the given $question.
* @param stdClass[]|null $filtercourses deprecated argument and should not be used
*/
function _tidy_question($question, $category, ?array $tagobjects = null, ?array $filtercourses = null): void {
if ($filtercourses !== null) {
debugging("Filtercourses is a deprecated argument in " . __FUNCTION__, DEBUG_DEVELOPER);
}
// Convert numeric fields to float. This prevents these being displayed as 1.0000000.
$question->defaultmark += 0;
$question->penalty += 0;
// Indicate the question is now fully initialised.
if (isset($question->_partiallyloaded)) {
unset($question->_partiallyloaded);
}
$question->categoryobject = $category;
// Add any tags we have been passed.
if (!is_null($tagobjects)) {
$categorycontext = context::instance_by_id($category->contextid);
$sortedtagobjects = question_sort_tags($tagobjects, $categorycontext, $filtercourses);
$question->tagobjects = $sortedtagobjects->tagobjects;
$question->tags = $sortedtagobjects->tags;
}
// Load question-type specific fields.
if (question_bank::is_qtype_installed($question->qtype)) {
question_bank::get_qtype($question->qtype)->get_question_options($question);
} else {
$question->questiontext = html_writer::tag('p', get_string('warningmissingtype',
'qtype_missingtype')) . $question->questiontext;
}
}
/**
* Updates the question objects with question type specific
* information by calling {@see get_question_options()}
*
* Can be called either with an array of question objects or with a single
* question object.
*
* @param mixed $questions Either an array of question objects to be updated
* or just a single question object
* @param bool $loadtags load the question tags from the tags table. Optional, default false.
* @param stdClass[] $filtercourses deprecated argument and should not be used
* @return bool Indicates success or failure.
*/
function get_question_options(&$questions, $loadtags = false, $filtercourses = null) {
global $DB;
if ($filtercourses !== null) {
debugging("Filtercourses is a deprecated argument in " . __FUNCTION__, DEBUG_DEVELOPER);
}
$questionlist = is_array($questions) ? $questions : [$questions];
$categoryids = [];
$questionids = [];
if (empty($questionlist)) {
return true;
}
foreach ($questionlist as $question) {
$questionids[] = $question->id;
if (isset($question->category)) {
$qcategoryid = $question->category;
} else {
$qcategoryid = get_question_bank_entry($question->id)->questioncategoryid;
$question->questioncategoryid = $qcategoryid;
}
if (!in_array($qcategoryid, $categoryids)) {
$categoryids[] = $qcategoryid;
}
}
$categories = $DB->get_records_list('question_categories', 'id', $categoryids);
if ($loadtags && core_tag_tag::is_enabled('core_question', 'question')) {
$tagobjectsbyquestion = core_tag_tag::get_items_tags('core_question', 'question', $questionids);
} else {
$tagobjectsbyquestion = null;
}
foreach ($questionlist as $question) {
if (is_null($tagobjectsbyquestion)) {
$tagobjects = null;
} else {
$tagobjects = $tagobjectsbyquestion[$question->id];
}
$qcategoryid = $question->category ?? $question->questioncategoryid ??
get_question_bank_entry($question->id)->questioncategoryid;
_tidy_question($question, $categories[$qcategoryid], $tagobjects, $filtercourses);
}
return true;
}
/**
* Sort question tags by course or normal tags.
*
* This function also search tag instances that may have a context id that don't match either a course or
* question context and fix the data setting the correct context id.
*
* @param \core_tag_tag[] $tagobjects The tags for the given $question.
* @param stdClass $categorycontext The question categories context.
* @param stdClass[]|null $filtercourses deprecated argument and should not be used.
* @return stdClass $sortedtagobjects Sorted tag objects.
*/
function question_sort_tags($tagobjects, $categorycontext, $filtercourses = null): stdClass {
if ($filtercourses !== null) {
debugging("Filtercourses is a deprecated argument in " . __FUNCTION__, DEBUG_DEVELOPER);
}
$sortedtagobjects = new stdClass();
$sortedtagobjects->tagobjects = [];
$sortedtagobjects->tags = [];
$taginstanceidstonormalise = [];
foreach ($tagobjects as $tagobject) {
$tagcontextid = $tagobject->taginstancecontextid;
$tagcontext = context::instance_by_id($tagcontextid);
// All tag instances belong to the context that the question was created in.
$sortedtagobjects->tagobjects[] = $tagobject;
$sortedtagobjects->tags[$tagobject->id] = $tagobject->get_display_name();
// Due to legacy tag implementations that don't force the recording
// of a context id, some tag instances may have context ids that don't
// match either a course context or the question context. In this case
// we should take the opportunity to fix up the data and set the correct
// context id.
if ($tagcontext->id != $categorycontext->id) {
$taginstanceidstonormalise[] = $tagobject->taginstanceid;
// Update the object properties to reflect the DB update that will
// happen below.
$tagobject->taginstancecontextid = $categorycontext->id;
}
}
if (!empty($taginstanceidstonormalise)) {
// If we found any tag instances with incorrect context id data then we can
// correct those values now by setting them to the question context id.
core_tag_tag::change_instances_context($taginstanceidstonormalise, $categorycontext);
}
return $sortedtagobjects;
}
/**
* Print the icon for the question type
*
* @param object $question The question object for which the icon is required.
* Only $question->qtype is used.
* @return string the HTML for the img tag.
*/
function print_question_icon($question): string {
global $PAGE;
if (gettype($question->qtype) == 'object') {
$qtype = $question->qtype->name();
} else {
// Assume string.
$qtype = $question->qtype;
}
return $PAGE->get_renderer('question', 'bank')->qtype_icon($qtype);
}
// CATEGORY FUNCTIONS.
/**
* Returns the categories with their names ordered following parent-child relationships.
* finally it tries to return pending categories (those being orphaned, whose parent is
* incorrect) to avoid missing any category from original array.
*
* @param array $categories
* @param int $id
* @param int $level
* @return array
*/
function sort_categories_by_tree(&$categories, $id = 0, $level = 1): array {
global $DB;
$children = [];
$keys = array_keys($categories);
foreach ($keys as $key) {
if (!isset($categories[$key]->processed) && $categories[$key]->parent == $id) {
$children[$key] = $categories[$key];
$categories[$key]->processed = true;
$children = $children + sort_categories_by_tree(
$categories, $children[$key]->id, $level + 1);
}
}
// If level = 1, we have finished, try to look for non processed categories (bad parent) and sort them too.
if ($level == 1) {
foreach ($keys as $key) {
// If not processed and it's a good candidate to start (because its parent doesn't exist in the course).
if (!isset($categories[$key]->processed) && !$DB->record_exists('question_categories',
array('contextid' => $categories[$key]->contextid,
'id' => $categories[$key]->parent))) {
$children[$key] = $categories[$key];
$categories[$key]->processed = true;
$children = $children + sort_categories_by_tree(
$categories, $children[$key]->id, $level + 1);
}
}
}
return $children;
}
/**
* Get the default category for the context. Optionally create one if it does not exist.
*
* @param int $contextid a context id.
* @param bool $createifnotexists create the default catagory if it does not exist.
* @return stdClass|bool the default question category for that context, or false if none.
*/
function question_get_default_category($contextid, bool $createifnotexists = false) {
global $DB;
$context = \core\context::instance_by_id($contextid);
if ($context->contextlevel !== CONTEXT_MODULE) {
debugging(
"Invalid context level {$context->contextlevel} for default category. Please use CONTEXT_MODULE",
DEBUG_DEVELOPER
);
return false;
}
$defaultcats = $DB->get_records_select('question_categories', 'contextid = ? AND parent <> 0', [$contextid], 'id', '*', 0, 1);
$defaultcat = reset($defaultcats);
if (empty($defaultcat) && $createifnotexists) {
// We need to make a top category first if it doesn't exist.
$topcategory = question_get_top_category($context->id, true);
// We don't have one, so we need to make one.
$defaultcat = new stdClass();
$contextname = $context->get_context_name(false, true);
// Max length of name field is 255.
$defaultcat->name = shorten_text(get_string('defaultfor', 'question', $contextname), 255);
$defaultcat->info = get_string('defaultinfofor', 'question', $contextname);
$defaultcat->contextid = $context->id;
$defaultcat->parent = $topcategory->id;
// By default, all categories get this number, and are sorted alphabetically.
$defaultcat->sortorder = 999;
$defaultcat->stamp = make_unique_id_code();
$defaultcat->id = $DB->insert_record('question_categories', $defaultcat);
}
return $defaultcat;
}
/**
* Gets the top category in the given context.
* This function can optionally create the top category if it doesn't exist.
*
* @param int $contextid A context id.
* @param bool $create Whether create a top category if it doesn't exist.
* @return bool|stdClass The top question category for that context, or false if none.
*/
function question_get_top_category($contextid, $create = false) {
global $DB;
$category = $DB->get_record('question_categories', ['contextid' => $contextid, 'parent' => 0]);
$context = context::instance_by_id($contextid);
if ($context->contextlevel !== CONTEXT_MODULE) {
debugging(
"Invalid context level: {$context->contextlevel} for question_get_top_category, must be CONTEXT_MODULE",
DEBUG_DEVELOPER
);
return false;
}
if (!$category && $create) {
// We need to make one.
$category = new stdClass();
$category->name = 'top'; // A non-real name for the top category. It will be localised at the display time.
$category->info = '';
$category->contextid = $contextid;
$category->parent = 0;
$category->sortorder = 0;
$category->stamp = make_unique_id_code();
$category->id = $DB->insert_record('question_categories', $category);
}
return $category;
}
/**
* Gets the list of top categories in the given contexts in the array("categoryid,categorycontextid") format.
*
* @param array $contextids List of context ids
* @return array
*/
function question_get_top_categories_for_contexts($contextids): array {
global $DB;
$concatsql = $DB->sql_concat_join("','", ['id', 'contextid']);
list($insql, $params) = $DB->get_in_or_equal($contextids);
$sql = "SELECT $concatsql
FROM {question_categories}
WHERE contextid $insql
AND parent = 0";
$topcategories = $DB->get_fieldset_sql($sql, $params);
return $topcategories;
}
/**
* Get the list of categories.
*
* @param int $categoryid
* @return array of question category ids of the category and all subcategories.
*/
function question_categorylist($categoryid): array {
global $DB;
// Final list of category IDs.
$categorylist = [];
// A list of category IDs to check for any sub-categories.
$subcategories = [$categoryid];
$contextid = $DB->get_field('question_categories', 'contextid', ['id' => $categoryid]);
while ($subcategories) {
foreach ($subcategories as $subcategory) {
// If anything from the temporary list was added already, then we have a loop.
if (isset($categorylist[$subcategory])) {
throw new coding_exception("Category id=$subcategory is already on the list - loop of categories detected.");
}
$categorylist[$subcategory] = $subcategory;
}
[$in, $params] = $DB->get_in_or_equal($subcategories);
$params[] = $contextid;
// Order by id is not strictly needed, but it will be cheap, and makes the results deterministic.
$subcategories = $DB->get_records_select_menu('question_categories',
"parent $in AND contextid = ?", $params, 'id', 'id,id AS id2');
}
return $categorylist;
}
/**
* Get all parent categories of a given question category in descending order.
*
* @param int $categoryid for which you want to find the parents.
* @return array of question category ids of all parents categories.
*/
function question_categorylist_parents(int $categoryid): array {
global $DB;
$category = $DB->get_record('question_categories', ['id' => $categoryid]);
$contextid = $category->contextid;
$categorylist = [];
while ($category->parent) {
$category = $DB->get_record('question_categories', ['id' => $category->parent]);
if (!$category || $category->contextid != $contextid) {
break;
}
$categorylist[] = $category->id;
}
// Present the list in descending order (the top category at the top).
return array_reverse($categorylist);
}
// Import/Export Functions.
/**
* Get list of available import or export formats
* @param string $type 'import' if import list, otherwise export list assumed
* @return array sorted list of import/export formats available
*/
function get_import_export_formats($type): array {
global $CFG;
require_once($CFG->dirroot . '/question/format.php');
$formatclasses = core_component::get_plugin_list_with_class('qformat', '', 'format.php');
$fileformatname = array();
foreach ($formatclasses as $component => $formatclass) {
$format = new $formatclass();
if ($type == 'import') {
$provided = $format->provide_import();
} else {
$provided = $format->provide_export();
}
if ($provided) {
list($notused, $fileformat) = explode('_', $component, 2);
$fileformatnames[$fileformat] = get_string('pluginname', $component);
}
}
core_collator::asort($fileformatnames);
return $fileformatnames;
}
/**
* Create a reasonable default file name for exporting questions from a particular
* category.
* @param object $course the course the questions are in.
* @param object $category the question category.
* @return string the filename.
*/
function question_default_export_filename($course, $category): string {
// We build a string that is an appropriate name (questions) from the lang pack,
// then the corse shortname, then the question category name, then a timestamp.
$base = clean_filename(get_string('exportfilename', 'question'));
$dateformat = str_replace(' ', '_', get_string('exportnameformat', 'question'));
$timestamp = clean_filename(userdate(time(), $dateformat, 99, false));
$shortname = clean_filename($course->shortname);
if ($shortname == '' || $shortname == '_' ) {
$shortname = $course->id;
}
$categoryname = clean_filename(format_string($category->name));
return "{$base}-{$shortname}-{$categoryname}-{$timestamp}";
}
/**
* Check capability on category.
*
* @param int|stdClass|question_definition $questionorid object or id.
* If an object is passed, it should include ->contextid and ->createdby.
* @param string $cap 'add', 'edit', 'view', 'use', 'move', or 'tag'.
* @param int $notused no longer used.
* @return bool this user has the capability $cap for this question $question?
*/
function question_has_capability_on($questionorid, $cap, $notused = -1): bool {
global $USER, $DB;
if (is_numeric($questionorid)) {
$questionid = (int)$questionorid;
} else if (is_object($questionorid)) {
// All we really need in this function is the contextid and author of the question.
// We won't bother fetching other details of the question if these 2 fields are provided.
if (isset($questionorid->contextid) && property_exists($questionorid, 'createdby')) {
$question = $questionorid;
} else if (!empty($questionorid->id)) {
$questionid = $questionorid->id;
}
}
// At this point, either $question or $questionid is expected to be set.
if (isset($questionid)) {
try {
$question = question_bank::load_question_data($questionid);
} catch (Exception $e) {
// Let's log the exception for future debugging,
// but not during Behat, or we can't test these cases.
if (!defined('BEHAT_SITE_RUNNING')) {
debugging($e->getMessage(), DEBUG_NORMAL, $e->getTrace());
}
$sql = 'SELECT q.id,
q.createdby,
qc.contextid
FROM {question} q
JOIN {question_versions} qv
ON qv.questionid = q.id
JOIN {question_bank_entries} qbe
ON qbe.id = qv.questionbankentryid
JOIN {question_categories} qc
ON qc.id = qbe.questioncategoryid
WHERE q.id = :id';
// Well, at least we tried. Seems that we really have to read from DB.
$question = $DB->get_record_sql($sql, ['id' => $questionid], MUST_EXIST);
}
}
if (!isset($question)) {
throw new coding_exception('$questionorid parameter needs to be an integer or an object.');
}
$context = context::instance_by_id($question->contextid);
// These are existing questions capabilities that are set per category.
// Each of these has a 'mine' and 'all' version that is appended to the capability name.
$capabilitieswithallandmine = ['edit' => 1, 'view' => 1, 'use' => 1, 'move' => 1, 'tag' => 1, 'comment' => 1];
if (!isset($capabilitieswithallandmine[$cap])) {
return has_capability('moodle/question:' . $cap, $context);
} else {
return has_capability('moodle/question:' . $cap . 'all', $context) ||
($question->createdby == $USER->id && has_capability('moodle/question:' . $cap . 'mine', $context));
}
}
/**
* Require capability on question.
*
* @param int|stdClass|question_definition $question object or id.
* If an object is passed, it should include ->contextid and ->createdby.
* @param string $cap 'add', 'edit', 'view', 'use', 'move' or 'tag'.
* @return bool true if the user has the capability. Throws exception if not.
*/
function question_require_capability_on($question, $cap): bool {
if (!question_has_capability_on($question, $cap)) {
throw new moodle_exception('nopermissions', '', '', $cap);
}
return true;
}
/**
* Gets the question edit url.
*
* @param object $context a context
* @return string|bool|void A URL for editing questions in this context.
*/
function question_edit_url($context) {
global $CFG, $SITE;
if (!has_any_capability(question_get_question_capabilities(), $context)) {
return false;
}
if ($context->contextlevel !== CONTEXT_MODULE) {
debugging(
"Invalid contextlevel: {$context->contextlevel} provided for question_edit_url, must be CONTEXT_MODULE",
DEBUG_DEVELOPER
);
return false;
}
$baseurl = $CFG->wwwroot . '/question/edit.php?';
$defaultcategory = question_get_default_category($context->id, true);
if ($defaultcategory) {
$baseurl .= 'cat=' . $defaultcategory->id . ',' . $context->id . '&';
}
switch ($context->contextlevel) {
case CONTEXT_SYSTEM:
return $baseurl . 'courseid=' . $SITE->id;
case CONTEXT_COURSECAT:
// This is nasty, becuase we can only edit questions in a course
// context at the moment, so for now we just return false.
return false;
case CONTEXT_COURSE:
return $baseurl . 'courseid=' . $context->instanceid;
case CONTEXT_MODULE:
return $baseurl . 'cmid=' . $context->instanceid;
}
return $baseurl . 'cmid=' . $context->instanceid;
}
/**
* Adds question bank setting links to the given navigation node if caps are met
* and loads the navigation from the plugins.
* Qbank plugins can extend the navigation_plugin_base and add their own navigation node,
* this method will help to autoload those nodes in the question bank navigation.
*
* @param navigation_node $navigationnode The navigation node to add the question branch to
* @param object $context
* @param string $baseurl the url of the base where the api is implemented from
* @return navigation_node Returns the question branch that was added
*/
function question_extend_settings_navigation(navigation_node $navigationnode, $context, $baseurl = '/question/edit.php') {
global $PAGE;
$iscourse = $context->contextlevel === CONTEXT_COURSE;
if ($iscourse) {
$params = ['courseid' => $context->instanceid];
} else if ($context->contextlevel == CONTEXT_MODULE) {
$params = ['cmid' => $context->instanceid];
} else {
return;
}
if (($cat = $PAGE->url->param('cat')) && preg_match('~\d+,\d+~', $cat)) {
$params['cat'] = $cat;
}
$questionnode = $navigationnode->add(get_string($iscourse ? 'questionbank_plural' : 'questionbank', 'question'),
new moodle_url($baseurl, $params), navigation_node::TYPE_CONTAINER, null, 'questionbank');
$corenavigations = [
'questions' => [
'title' => get_string('questions', 'question'),
'url' => new moodle_url($baseurl)
],
'categories' => [],
'import' => [],
'export' => []
];
$plugins = \core_component::get_plugin_list_with_class('qbank', 'plugin_feature', 'plugin_feature.php');
foreach ($plugins as $componentname => $plugin) {
$pluginentrypoint = new $plugin();
$pluginentrypointobject = $pluginentrypoint->get_navigation_node();
// Don't need the plugins without navigation node.
if ($pluginentrypointobject === null) {
unset($plugins[$componentname]);
continue;
}
foreach ($corenavigations as $key => $corenavigation) {
if ($pluginentrypointobject->get_navigation_key() === $key) {
unset($plugins[$componentname]);
if (!\core\plugininfo\qbank::is_plugin_enabled($componentname)) {
unset($corenavigations[$key]);
break;
}
$corenavigations[$key] = [
'title' => $pluginentrypointobject->get_navigation_title(),
'url' => $pluginentrypointobject->get_navigation_url()
];
}
}
}
// Mitigate the risk of regression.
foreach ($corenavigations as $node => $corenavigation) {
if (empty($corenavigation)) {
unset($corenavigations[$node]);
}
}
// Community/additional plugins have navigation node.
$pluginnavigations = [];
foreach ($plugins as $componentname => $plugin) {
$pluginentrypoint = new $plugin();
$pluginentrypointobject = $pluginentrypoint->get_navigation_node();
// Don't need the plugins without navigation node.
if ($pluginentrypointobject === null || !\core\plugininfo\qbank::is_plugin_enabled($componentname)) {
unset($plugins[$componentname]);
continue;
}
$pluginnavigations[$pluginentrypointobject->get_navigation_key()] = [
'title' => $pluginentrypointobject->get_navigation_title(),
'url' => $pluginentrypointobject->get_navigation_url(),
'capabilities' => $pluginentrypointobject->get_navigation_capabilities()
];
}
$contexts = new core_question\local\bank\question_edit_contexts($context);
foreach ($corenavigations as $key => $corenavigation) {
if ($contexts->have_one_edit_tab_cap($key)) {
$questionnode->add($corenavigation['title'], new moodle_url(
$corenavigation['url'], $params), navigation_node::TYPE_SETTING, null, $key);
}
}
foreach ($pluginnavigations as $key => $pluginnavigation) {
if (is_array($pluginnavigation['capabilities'])) {
if (!$contexts->have_one_cap($pluginnavigation['capabilities'])) {
continue;
}
}
$questionnode->add($pluginnavigation['title'], new moodle_url(
$pluginnavigation['url'], $params), navigation_node::TYPE_SETTING, null, $key);
}
return $questionnode;
}
/**
* Get the array of capabilities for question.
*
* @return array all the capabilities that relate to accessing particular questions.
*/
function question_get_question_capabilities(): array {
return [
'moodle/question:add',
'moodle/question:editmine',
'moodle/question:editall',
'moodle/question:viewmine',
'moodle/question:viewall',
'moodle/question:usemine',
'moodle/question:useall',
'moodle/question:movemine',
'moodle/question:moveall',
'moodle/question:tagmine',
'moodle/question:tagall',
'moodle/question:commentmine',
'moodle/question:commentall',
];
}
/**
* Get the question bank caps.
*
* @return array all the question bank capabilities.
*/
function question_get_all_capabilities(): array {
$caps = question_get_question_capabilities();
$caps[] = 'moodle/question:managecategory';
$caps[] = 'moodle/question:flag';
return $caps;
}
/**
* Helps call file_rewrite_pluginfile_urls with the right parameters.
*
* @package core_question
* @category files
* @param string $text text being processed
* @param string $file the php script used to serve files
* @param int $contextid context ID
* @param string $component component
* @param string $filearea filearea
* @param array $ids other IDs will be used to check file permission
* @param int $itemid item ID
* @param array $options options
* @return string
*/
function question_rewrite_question_urls($text, $file, $contextid, $component, $filearea,
array $ids, $itemid, ?array $options=null): string {
$idsstr = '';
if (!empty($ids)) {
$idsstr .= implode('/', $ids);
}
if ($itemid !== null) {
$idsstr .= '/' . $itemid;
}
return file_rewrite_pluginfile_urls($text, $file, $contextid, $component,
$filearea, $idsstr, $options);
}
/**
* Rewrite the PLUGINFILE urls in part of the content of a question, for use when
* viewing the question outside an attempt (for example, in the question bank
* listing or in the quiz statistics report).
*
* @param string $text the question text.
* @param int $questionid the question id.
* @param int $filecontextid the context id of the question being displayed.
* @param string $filecomponent the component that owns the file area.
* @param string $filearea the file area name.
* @param int|null $itemid the file's itemid
* @param int $previewcontextid the context id where the preview is being displayed.
* @param string $previewcomponent component responsible for displaying the preview.
* @param array $options text and file options ('forcehttps'=>false)
* @return string $questiontext with URLs rewritten.
*/
function question_rewrite_question_preview_urls($text, $questionid, $filecontextid, $filecomponent, $filearea, $itemid,
$previewcontextid, $previewcomponent, $options = null): string {
$path = "preview/$previewcontextid/$previewcomponent/$questionid";
if ($itemid) {
$path .= '/' . $itemid;
}
return file_rewrite_pluginfile_urls($text, 'pluginfile.php', $filecontextid,
$filecomponent, $filearea, $path, $options);
}
/**
* Called by pluginfile.php to serve files related to the 'question' core
* component and for files belonging to qtypes.
*
* For files that relate to questions in a question_attempt, then we delegate to
* a function in the component that owns the attempt (for example in the quiz,
* or in core question preview) to get necessary inforation.
*
* (Note that, at the moment, all question file areas relate to questions in
* attempts, so the If at the start of the last paragraph is always true.)
*
* Does not return, either calls send_file_not_found(); or serves the file.
*
* @category files
* @param stdClass $course course settings object
* @param stdClass $context context object
* @param string $component the name of the component we are serving files for.
* @param string $filearea the name of the file area.
* @param array $args the remaining bits of the file path.
* @param bool $forcedownload whether the user must be forced to download the file.
* @param array $options additional options affecting the file serving
* @return array|bool
*/
function question_pluginfile($course, $context, $component, $filearea, $args, $forcedownload, $options = []) {
global $DB, $CFG;
// Special case, sending a question bank export.
if ($filearea === 'export') {
list($context, $course, $cm) = get_context_info_array($context->id);
require_login($course, false, $cm);
require_once($CFG->dirroot . '/question/editlib.php');
$contexts = new core_question\local\bank\question_edit_contexts($context);
// Check export capability.
$contexts->require_one_edit_tab_cap('export');
$categoryid = (int)array_shift($args);
$format = array_shift($args);
$cattofile = array_shift($args);
$contexttofile = array_shift($args);
$filename = array_shift($args);
// Load parent class for import/export.
require_once($CFG->dirroot . '/question/format.php');
require_once($CFG->dirroot . '/question/editlib.php');
require_once($CFG->dirroot . '/question/format/' . $format . '/format.php');
$classname = 'qformat_' . $format;
if (!class_exists($classname)) {
send_file_not_found();
}
$qformat = new $classname();
if (!$category = $DB->get_record('question_categories', array('id' => $categoryid))) {
send_file_not_found();
}
$qformat->setCategory($category);
$qformat->setContexts($contexts->having_one_edit_tab_cap('export'));
$qformat->setCourse($course);
if ($cattofile == 'withcategories') {
$qformat->setCattofile(true);
} else {
$qformat->setCattofile(false);
}
if ($contexttofile == 'withcontexts') {
$qformat->setContexttofile(true);
} else {
$qformat->setContexttofile(false);
}
if (!$qformat->exportpreprocess()) {
send_file_not_found();
throw new moodle_exception('exporterror', 'question', $thispageurl->out());
}
// Export data to moodle file pool.
if (!$content = $qformat->exportprocess()) {
send_file_not_found();
}
send_file($content, $filename, 0, 0, true, true, $qformat->mime_type());
}
// Normal case, a file belonging to a question.
$qubaidorpreview = array_shift($args);
// Two sub-cases: 1. A question being previewed outside an attempt/usage.
if ($qubaidorpreview === 'preview') {
$previewcontextid = (int)array_shift($args);
$previewcomponent = array_shift($args);
$questionid = (int) array_shift($args);
$previewcontext = context_helper::instance_by_id($previewcontextid);
$result = component_callback($previewcomponent, 'question_preview_pluginfile', array(
$previewcontext, $questionid,
$context, $component, $filearea, $args,
$forcedownload, $options), 'callbackmissing');
if ($result === 'callbackmissing') {
throw new coding_exception("Component {$previewcomponent} does not define the callback " .
"{$previewcomponent}_question_preview_pluginfile callback. " .
"Which is required if you are using question_rewrite_question_preview_urls.", DEBUG_DEVELOPER);
}
send_file_not_found();
}
// 2. A question being attempted in the normal way.
$qubaid = (int)$qubaidorpreview;
$slot = (int)array_shift($args);
$module = $DB->get_field('question_usages', 'component',
array('id' => $qubaid));
if (!$module) {
send_file_not_found();
}
if ($module === 'core_question_preview') {
return qbank_previewquestion\helper::question_preview_question_pluginfile($course, $context,
$component, $filearea, $qubaid, $slot, $args, $forcedownload, $options);
} else {
$dir = core_component::get_component_directory($module);
if (!file_exists("$dir/lib.php")) {
send_file_not_found();
}
include_once("$dir/lib.php");
$filefunction = $module . '_question_pluginfile';
if (function_exists($filefunction)) {
$filefunction($course, $context, $component, $filearea, $qubaid, $slot,
$args, $forcedownload, $options);
}
// Okay, we're here so lets check for function without 'mod_'.
if (strpos($module, 'mod_') === 0) {
$filefunctionold = substr($module, 4) . '_question_pluginfile';
if (function_exists($filefunctionold)) {
$filefunctionold($course, $context, $component, $filearea, $qubaid, $slot,
$args, $forcedownload, $options);
}
}
send_file_not_found();
}
}
/**
* Serve questiontext files in the question text when they are displayed in this report.
*
* @param context $previewcontext the context in which the preview is happening.
* @param int $questionid the question id.
* @param context $filecontext the file (question) context.
* @param string $filecomponent the component the file belongs to.
* @param string $filearea the file area.
* @param array $args remaining file args.
* @param bool $forcedownload
* @param array $options additional options affecting the file serving.
*/
function core_question_question_preview_pluginfile($previewcontext, $questionid, $filecontext, $filecomponent,
$filearea, $args, $forcedownload, $options = []): void {
global $DB;
$sql = 'SELECT q.*,
qc.contextid
FROM {question} q
JOIN {question_versions} qv
ON qv.questionid = q.id
JOIN {question_bank_entries} qbe
ON qbe.id = qv.questionbankentryid
JOIN {question_categories} qc
ON qc.id = qbe.questioncategoryid
WHERE q.id = :id
AND qc.contextid = :contextid';
// Verify that contextid matches the question.
$question = $DB->get_record_sql($sql, ['id' => $questionid, 'contextid' => $filecontext->id], MUST_EXIST);
// Check the capability.
list($context, $course, $cm) = get_context_info_array($previewcontext->id);
require_login($course, false, $cm);
question_require_capability_on($question, 'use');
$fs = get_file_storage();
$relativepath = implode('/', $args);
$fullpath = "/{$filecontext->id}/{$filecomponent}/{$filearea}/{$relativepath}";
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
send_stored_file($file, 0, 0, $forcedownload, $options);
}
/**
* Return a list of page types
* @param string $pagetype current page type
* @param stdClass $parentcontext Block's parent context
* @param stdClass $currentcontext Current context of block
* @return array
*/
function question_page_type_list($pagetype, $parentcontext, $currentcontext): array {
global $CFG;
$types = [
'question-*' => get_string('page-question-x', 'question'),
'question-edit' => get_string('page-question-edit', 'question'),
'question-category' => get_string('page-question-category', 'question'),
'question-export' => get_string('page-question-export', 'question'),
'question-import' => get_string('page-question-import', 'question')
];
if ($currentcontext->contextlevel == CONTEXT_COURSE) {
require_once($CFG->dirroot . '/course/lib.php');
return array_merge(course_page_type_list($pagetype, $parentcontext, $currentcontext), $types);
} else {
return $types;
}
}
/**
* Does an activity module use the question bank?
*
* @param string $modname The name of the module (without mod_ prefix).
* @return bool true if the module uses questions.
*/
function question_module_uses_questions($modname): bool {
if (plugin_supports('mod', $modname, FEATURE_USES_QUESTIONS)) {
return true;
}
$component = 'mod_'.$modname;
if (component_callback_exists($component, 'question_pluginfile')) {
debugging("{$component} uses questions but doesn't declare FEATURE_USES_QUESTIONS", DEBUG_DEVELOPER);
return true;
}
return false;
}
/**
* If $oldidnumber ends in some digits then return the next available idnumber of the same form.
*
* So idnum -> null (no digits at the end) idnum0099 -> idnum0100 (if that is unused,
* else whichever of idnum0101, idnume0102, ... is unused. idnum9 -> idnum10.
*
* @param string|null $oldidnumber a question idnumber, or can be null.
* @param int $categoryid a question category id.
* @return string|null suggested new idnumber for a question in that category, or null if one cannot be found.
*/
function core_question_find_next_unused_idnumber(?string $oldidnumber, int $categoryid): ?string {
global $DB;
// The the old idnumber is not of the right form, bail now.
if ($oldidnumber === null || !preg_match('~\d+$~', $oldidnumber, $matches)) {
return null;
}
// Find all used idnumbers in one DB query.
$usedidnumbers = $DB->get_records_select_menu('question_bank_entries', 'questioncategoryid = ? AND idnumber IS NOT NULL',
[$categoryid], '', 'idnumber, 1');
// Find the next unused idnumber.
$numberbit = 'X' . $matches[0]; // Need a string here so PHP does not do '0001' + 1 = 2.
$stem = substr($oldidnumber, 0, -strlen($matches[0]));
do {
// If we have got to something9999, insert an extra digit before incrementing.
if (preg_match('~^(.*[^0-9])(9+)$~', $numberbit, $matches)) {
$numberbit = $matches[1] . '0' . $matches[2];
}
$numberbit++;
$newidnumber = $stem . substr($numberbit, 1);
} while (isset($usedidnumbers[$newidnumber]));
return (string) $newidnumber;
}
/**
* Get the question_bank_entry object given a question id.
*
* @param int $questionid Question id.
* @return false|mixed
* @throws dml_exception
*/
function get_question_bank_entry(int $questionid): object {
global $DB;
$sql = "SELECT qbe.*
FROM {question} q
JOIN {question_versions} qv ON qv.questionid = q.id
JOIN {question_bank_entries} qbe ON qbe.id = qv.questionbankentryid
WHERE q.id = :id";
$qbankentry = $DB->get_record_sql($sql, ['id' => $questionid]);
return $qbankentry;
}
/**
* Get the question versions given a question id in a descending sort .
*
* @param int $questionid Question id.
* @return array
* @throws dml_exception
*/
function get_question_version($questionid): array {
global $DB;
$version = $DB->get_records('question_versions', ['questionid' => $questionid]);
krsort($version);
return $version;
}
/**
* Get the next version number to create base on a Question bank entry id.
*
* @param int $questionbankentryid Question bank entry id.
* @return int next version number.
* @throws dml_exception
*/
function get_next_version(int $questionbankentryid): int {
global $DB;
$sql = "SELECT MAX(qv.version)
FROM {question_versions} qv
JOIN {question_bank_entries} qbe ON qbe.id = qv.questionbankentryid
WHERE qbe.id = :id";
$nextversion = $DB->get_field_sql($sql, ['id' => $questionbankentryid]);
if ($nextversion) {
return (int)$nextversion + 1;
}
return 1;
}
/**
* Checks if question is the latest version.
*
* @param string $version Question version to check.
* @param string $questionbankentryid Entry to check against.
* @return bool
*/
function is_latest(string $version, string $questionbankentryid): bool {
global $DB;
$sql = 'SELECT MAX(version) AS max
FROM {question_versions}
WHERE questionbankentryid = ?';
$latestversion = $DB->get_record_sql($sql, [$questionbankentryid]);
if (isset($latestversion->max)) {
return ($version === $latestversion->max) ? true : false;
}
return false;
}