Current Path : C:/Users/Mahmood/Desktop/moodle/lib/ |
Current File : C:/Users/Mahmood/Desktop/moodle/lib/questionlib.php |
<?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, .. * This script also loads the questiontype classes * Code for handling the editing of questions is in {@link question/editlib.php} * * TODO: separate those functions which form part of the API * from the helper functions. * * @package moodlecore * @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 */ 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) { $neworder = array_keys($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. * @global object * @param $neworder An arra $index => $qtype. Indices should start at 0 and be in order. * @param $config get_config('question'), if you happen to have it around, to save one DB query. */ function question_save_qtype_order($neworder, $config = null) { global $DB; if (is_null($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 ////////////////////////////////////////////////////// /** * @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) { // Are they used by the core question system? if (question_engine::questions_in_use($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 arey 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) { global $DB; if (is_object($context)) { $contextid = $context->id; } else if (is_numeric($context)) { $contextid = $context; } else { print_error('invalidcontextinhasanyquestions', 'question'); } return $DB->record_exists_sql("SELECT * FROM {question} q JOIN {question_categories} qc ON qc.id = q.category WHERE qc.contextid = ? AND q.parent = 0", array($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 $matchgrades 'error' or 'nearest' * @return mixed either 'fixed' value or false if error. */ function match_grade_options($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'); } } /** * Remove stale questions from a category. * * While questions should not be left behind when they are not used any more, * it does happen, maybe via restore, or old logic, or uncovered scenarios. When * this happens, the users are unable to delete the question category unless * they move those stale questions to another one category, but to them the * category is empty as it does not contain anything. The purpose of this function * is to detect the questions that may have gone stale and remove them. * * You will typically use this prior to checking if the category contains questions. * * The stale questions (unused and hidden to the user) handled are: * - hidden questions * - random questions * * @param int $categoryid The category ID. */ function question_remove_stale_questions_from_category($categoryid) { global $DB; $select = 'category = :categoryid AND (qtype = :qtype OR hidden = :hidden)'; $params = ['categoryid' => $categoryid, 'qtype' => 'random', 'hidden' => 1]; $questions = $DB->get_recordset_select("question", $select, $params, '', 'id'); foreach ($questions as $question) { // The function question_delete_question does not delete questions in use. question_delete_question($question->id); } $questions->close(); } /** * 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 $category course category object */ function question_category_delete_safe($category) { global $DB; $criteria = array('category' => $category->id); $context = context::instance_by_id($category->contextid, IGNORE_MISSING); $rescue = null; // See the code around the call to question_save_from_deletion. // Deal with any questions in the category. if ($questions = $DB->get_records('question', $criteria, '', 'id,qtype')) { // Try to delete each question. foreach ($questions as $question) { question_delete_question($question->id); } // 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 = $DB->get_records_menu('question', $criteria, '', 'id, 1'); if (!empty($questionids)) { $parentcontextid = SYSCONTEXTID; $name = get_string('unknown', 'question'); if ($context !== false) { $name = $context->get_context_name(); $parentcontext = $context->get_parent_context(); if ($parentcontext) { $parentcontextid = $parentcontext->id; } } question_save_from_deletion(array_keys($questionids), $parentcontextid, $name, $rescue); } } // Now delete the category. $DB->delete_records('question_categories', array('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) { global $DB; //Look at each question in the category if ($questions = $DB->get_records_menu('question', array('category' => $categoryid), '', 'id, 1')) { if (questions_in_use(array_keys($questions))) { return true; } } if (!$recursive) { return false; } //Look under child categories recursively if ($children = $DB->get_records('question_categories', array('parent' => $categoryid), '', 'id, 1')) { foreach ($children as $child) { if (question_category_in_use($child->id, $recursive)) { return true; } } } return false; } /** * Deletes question and all associated data from the database * * It will not delete a question if it is used somewhere. * * @param object $question The question being deleted */ function question_delete_question($questionid) { global $DB; $question = $DB->get_record_sql(' SELECT q.*, ctx.id AS contextid FROM {question} q LEFT JOIN {question_categories} qc ON qc.id = q.category LEFT JOIN {context} ctx ON ctx.id = qc.contextid WHERE q.id = ?', array($questionid)); if (!$question) { // In some situations, for example if this was a child of a // Cloze question that was previously deleted, the question may already // have gone. In this case, just do nothing. return; } // Do not delete a question if it is used by an activity module if (questions_in_use(array($questionid))) { return; } // This sometimes happens in old sites with bad data. if (!$question->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.'); $question->contextid = context_system::instance()->id; } // Delete previews of the question. $dm = new question_engine_data_mapper(); $dm->delete_previews($questionid); // delete questiontype-specific data question_bank::get_qtype($question->qtype, false)->delete_question( $questionid, $question->contextid); // Delete all tag instances. core_tag_tag::remove_all_item_tags('core_question', 'question', $question->id); // Now recursively delete all child questions if ($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', array('id' => $questionid)); question_bank::notify_question_edited($questionid); // Log the deletion of this question. $event = \core\event\question_deleted::create_from_question_instance($question); $event->add_record_snapshot('question', $question); $event->trigger(); } /** * All question categories and their questions are deleted for this context id. * * @param int $contextid The contextid to delete question categories from * @return array only returns an empty array for backwards compatibility. */ function question_delete_context($contextid) { global $DB; $fields = 'id, parent, name, contextid'; if ($categories = $DB->get_records('question_categories', array('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); } } return []; } /** * All question categories and their questions are deleted for this course. * * @param stdClass $course an object representing the activity * @param bool $notused this argument is not used any more. Kept for backwards compatibility. * @return bool always true. */ function question_delete_course($course, $notused = false) { $coursecontext = context_course::instance($course->id); question_delete_context($coursecontext->id); return true; } /** * Category is about to be deleted, * 1/ All question categories and their questions are deleted for this course category. * 2/ All questions are moved to new category * * @param stdClass|core_course_category $category course category object * @param stdClass|core_course_category $newcategory empty means everything deleted, otherwise id of * category where content moved * @param bool $notused this argument is no longer used. Kept for backwards compatibility. * @return boolean */ function question_delete_course_category($category, $newcategory, $notused=false) { global $DB; $context = context_coursecat::instance($category->id); if (empty($newcategory)) { question_delete_context($context->id); } else { // Move question categories to the new context. if (!$newcontext = context_coursecat::instance($newcategory->id)) { return false; } // Only move question categories if there is any question category at all! if ($topcategory = question_get_top_category($context->id)) { $newtopcategory = question_get_top_category($newcontext->id, true); question_move_category_to_context($topcategory->id, $context->id, $newcontext->id); $DB->set_field('question_categories', 'parent', $newtopcategory->id, array('parent' => $topcategory->id)); // Now delete the top category. $DB->delete_records('question_categories', array('id' => $topcategory->id)); } } return true; } /** * Enter description here... * * @param array $questionids of question ids * @param object $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 $DB; // Make a category in the parent context to move the questions to. if (is_null($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 $notused the argument is not used any more. Kept for backwards compatibility. * @return boolean */ function question_delete_activity($cm, $notused = false) { global $DB; $modcontext = context_module::instance($cm->id); question_delete_context($modcontext->id); return true; } /** * This function will handle moving all tag instances to a new context for a * given list of questions. * * Questions can be tagged in up to two contexts: * 1.) The context the question exists in. * 2.) The course context (if the question context is a higher context. * E.g. course category context or system context. * * This means a question that exists in a higher context (e.g. course cat or * system context) may have multiple groups of tags in any number of child * course contexts. * * Questions in the course category context can be move "down" a context level * into one of their child course contexts or activity contexts which affects the * availability of that question in other courses / activities. * * In this case it makes the questions no longer available in the other course or * activity contexts so we need to make sure that the tag instances in those other * contexts are removed. * * @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 */ function question_move_question_tags_to_new_context(array $questions, context $newcontext) { // If the questions are moving to a new course/activity context then we need to // find any existing tag instances from any unavailable course contexts and // delete them because they will no longer be applicable (we don't support // tagging questions across courses). $instancestodelete = []; $instancesfornewcontext = []; $newcontextparentids = $newcontext->get_parent_context_ids(); $questionids = array_map(function($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; $istaginquestioncontext = $tagcontextid == $question->contextid; if ($istaginnewcontext) { // This tag instance is already in the correct context so we can // ignore it. continue; } if ($istaginquestioncontext) { // This tag instance is in the question context so it needs to be // updated. $instancesfornewcontext[] = $tagid; continue; } // These tag instances are in neither the new context nor the // question context so we need to determine what to do based on // the context they are in and the new question context. $tagcontext = context::instance_by_id($tagcontextid); $tagcoursecontext = $tagcontext->get_course_context(false); // The tag is in a course context if get_course_context() returns // itself. $istaginstancecontextcourse = !empty($tagcoursecontext) && $tagcontext->id == $tagcoursecontext->id; if ($istaginstancecontextcourse) { // If the tag instance is in a course context we need to add some // special handling. $tagcontextparentids = $tagcontext->get_parent_context_ids(); $isnewcontextaparent = in_array($newcontext->id, $tagcontextparentids); $isnewcontextachild = in_array($tagcontext->id, $newcontextparentids); if ($isnewcontextaparent) { // If the tag instance is a course context tag and the new // context is still a parent context to the tag context then // we can leave this tag where it is. continue; } else if ($isnewcontextachild) { // If the new context is a child context (e.g. activity) of this // tag instance then we should move all of this tag instance // down into the activity context along with the question. $instancesfornewcontext[] = $tagid; } else { // If the tag is in a course context that is no longer a parent // or child of the new context then this tag instance should be // removed. $instancestodelete[] = $tagid; } } else { // This is a catch all for any tag instances not in the question // context or a course context. These tag instances should be // updated to the new context id. This will clean up old invalid // data. $instancesfornewcontext[] = $tagid; } } } if (!empty($instancestodelete)) { // Delete any course context tags that may no longer be valid. core_tag_tag::delete_instances_by_id($instancestodelete); } if (!empty($instancesfornewcontext)) { // Update the tag instances to the new context id. core_tag_tag::change_instances_context($instancesfornewcontext, $newcontext); } } /** * 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 $newcategoryid the id of the category to move to. */ function question_move_questions_to_category($questionids, $newcategoryid) { global $DB; $newcontextid = $DB->get_field('question_categories', 'contextid', array('id' => $newcategoryid)); list($questionidcondition, $params) = $DB->get_in_or_equal($questionids); $questions = $DB->get_records_sql(" SELECT q.id, q.qtype, qc.contextid, q.idnumber, q.category FROM {question} q JOIN {question_categories} qc ON q.category = qc.id WHERE q.id $questionidcondition", $params); foreach ($questions as $question) { if ($newcontextid != $question->contextid) { question_bank::get_qtype($question->qtype)->move_files( $question->id, $question->contextid, $newcontextid); } // Check whether there could be a clash of idnumbers in the new category. if (((string) $question->idnumber !== '') && $DB->record_exists('question', ['idnumber' => $question->idnumber, 'category' => $newcategoryid])) { $rec = $DB->get_records_select('question', "category = ? AND idnumber LIKE ?", [$newcategoryid, $question->idnumber . '_%'], 'idnumber DESC', 'id, idnumber', 0, 1); $unique = 1; if (count($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. $q = new stdClass(); $q->id = $question->id; $q->category = $newcategoryid; $q->idnumber = $question->idnumber . '_' . $unique; $DB->update_record('question', $q); } // Log this question move. $event = \core\event\question_moved::create_from_question_instance($question, context::instance_by_id($question->contextid), ['oldcategoryid' => $question->category, 'newcategoryid' => $newcategoryid]); $event->trigger(); } // Move the questions themselves. $DB->set_field_select('question', 'category', $newcategoryid, "id $questionidcondition", $params); // Move any subquestions belonging to them. $DB->set_field_select('question', 'category', $newcategoryid, "parent $questionidcondition", $params); $newcontext = context::instance_by_id($newcontextid); 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; } /** * 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) { global $DB; $questions = []; $questionids = $DB->get_records_menu('question', array('category' => $categoryid), '', 'id,qtype'); foreach ($questionids as $questionid => $qtype) { question_bank::get_qtype($qtype)->move_files( $questionid, $oldcontextid, $newcontextid); // Purge this question from the cache. question_bank::notify_question_edited($questionid); $questions[] = (object) [ 'id' => $questionid, 'contextid' => $oldcontextid ]; } $newcontext = context::instance_by_id($newcontextid); question_move_question_tags_to_new_context($questions, $newcontext); $subcatids = $DB->get_records_menu('question_categories', array('parent' => $categoryid), '', 'id,1'); foreach ($subcatids as $subcatid => $notused) { $DB->set_field('question_categories', 'contextid', $newcontextid, array('id' => $subcatid)); question_move_category_to_context($subcatid, $oldcontextid, $newcontextid); } } /** * Generate the URL for starting a new preview of a given question with the given options. * @param integer $questionid the question to preview. * @param string $preferredbehaviour the behaviour to use for the preview. * @param float $maxmark the maximum to mark the question out of. * @param question_display_options $displayoptions the display options to use. * @param int $variant the variant of the question to preview. If null, one will * be picked randomly. * @param object $context context to run the preview in (affects things like * filter settings, theme, lang, etc.) Defaults to $PAGE->context. * @return moodle_url the URL. */ function question_preview_url($questionid, $preferredbehaviour = null, $maxmark = null, $displayoptions = null, $variant = null, $context = null) { $params = array('id' => $questionid); if (is_null($context)) { global $PAGE; $context = $PAGE->context; } if ($context->contextlevel == CONTEXT_MODULE) { $params['cmid'] = $context->instanceid; } else if ($context->contextlevel == CONTEXT_COURSE) { $params['courseid'] = $context->instanceid; } if (!is_null($preferredbehaviour)) { $params['behaviour'] = $preferredbehaviour; } if (!is_null($maxmark)) { $params['maxmark'] = format_float($maxmark, -1); } if (!is_null($displayoptions)) { $params['correctness'] = $displayoptions->correctness; $params['marks'] = $displayoptions->marks; $params['markdp'] = $displayoptions->markdp; $params['feedback'] = (bool) $displayoptions->feedback; $params['generalfeedback'] = (bool) $displayoptions->generalfeedback; $params['rightanswer'] = (bool) $displayoptions->rightanswer; $params['history'] = (bool) $displayoptions->history; } if ($variant) { $params['variant'] = $variant; } return new moodle_url('/question/preview.php', $params); } /** * @return array that can be passed as $params to the {@link popup_action} constructor. */ function question_preview_popup_params() { return array( 'height' => 600, 'width' => 800, ); } /** * 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 mod/quiz/attemptlib.php, 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 = array(), $orderby = '') { global $DB; if ($questionids === null) { $where = ''; $params = array(); } else { if (empty($questionids)) { return array(); } list($questionidcondition, $params) = $DB->get_in_or_equal( $questionids, SQL_PARAMS_NAMED, 'qid0000'); $where = 'WHERE q.id ' . $questionidcondition; } if ($join) { $join = 'JOIN ' . $join; } if ($extrafields) { $extrafields = ', ' . $extrafields; } if ($orderby) { $orderby = 'ORDER BY ' . $orderby; } $sql = "SELECT q.*, qc.contextid{$extrafields} FROM {question} q JOIN {question_categories} qc ON q.category = qc.id {$join} {$where} {$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. * @param array $extraparams values for any placeholders in $join. * You are strongly recommended to use named placeholder. * * @return array question objects. */ function question_load_questions($questionids, $extrafields = '', $join = '') { $questions = question_preload_questions($questionids, $extrafields, $join); // Load the question type specific information if (!get_question_options($questions)) { return 'Could not load the question options'; } 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 stdClass[]|null $tagobjects The tags for the given $question. * @param stdClass[]|null $filtercourses The courses to filter the course tags by. */ function _tidy_question($question, $category, array $tagobjects = null, array $filtercourses = null) { // Load question-type specific fields. if (!question_bank::is_qtype_installed($question->qtype)) { $question->questiontext = html_writer::tag('p', get_string('warningmissingtype', 'qtype_missingtype')) . $question->questiontext; } question_bank::get_qtype($question->qtype)->get_question_options($question); // Convert numeric fields to float. (Prevents these being displayed as 1.0000000.) $question->defaultmark += 0; $question->penalty += 0; if (isset($question->_partiallyloaded)) { unset($question->_partiallyloaded); } $question->categoryobject = $category; if (!is_null($tagobjects)) { $categorycontext = context::instance_by_id($category->contextid); $sortedtagobjects = question_sort_tags($tagobjects, $categorycontext, $filtercourses); $question->coursetagobjects = $sortedtagobjects->coursetagobjects; $question->coursetags = $sortedtagobjects->coursetags; $question->tagobjects = $sortedtagobjects->tagobjects; $question->tags = $sortedtagobjects->tags; } } /** * Updates the question objects with question type specific * information by calling {@link 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[] $filtercourses The courses to filter the course tags by. * @return bool Indicates success or failure. */ function get_question_options(&$questions, $loadtags = false, $filtercourses = null) { global $DB; $questionlist = is_array($questions) ? $questions : [$questions]; $categoryids = []; $questionids = []; if (empty($questionlist)) { return true; } foreach ($questionlist as $question) { $questionids[] = $question->id; if (!in_array($question->category, $categoryids)) { $categoryids[] = $question->category; } } $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]; } _tidy_question($question, $categories[$question->category], $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 stdClass[] $tagobjects The tags for the given $question. * @param stdClass $categorycontext The question categories context. * @param stdClass[]|null $filtercourses The courses to filter the course tags by. * @return stdClass $sortedtagobjects Sorted tag objects. */ function question_sort_tags($tagobjects, $categorycontext, $filtercourses = null) { // Questions can have two sets of tag instances. One set at the // course context level and another at the context the question // belongs to (e.g. course category, system etc). $sortedtagobjects = new stdClass(); $sortedtagobjects->coursetagobjects = []; $sortedtagobjects->coursetags = []; $sortedtagobjects->tagobjects = []; $sortedtagobjects->tags = []; $taginstanceidstonormalise = []; $filtercoursecontextids = []; $hasfiltercourses = !empty($filtercourses); if ($hasfiltercourses) { // If we're being asked to filter the course tags by a set of courses // then get the context ids to filter below. $filtercoursecontextids = array_map(function($course) { $coursecontext = context_course::instance($course->id); return $coursecontext->id; }, $filtercourses); } foreach ($tagobjects as $tagobject) { $tagcontextid = $tagobject->taginstancecontextid; $tagcontext = context::instance_by_id($tagcontextid); $tagcoursecontext = $tagcontext->get_course_context(false); // This is a course tag if the tag context is a course context which // doesn't match the question's context. Any tag in the question context // is not considered a course tag, it belongs to the question. $iscoursetag = $tagcoursecontext && $tagcontext->id == $tagcoursecontext->id && $tagcontext->id != $categorycontext->id; if ($iscoursetag) { // Any tag instance in a course context level is considered a course tag. if (!$hasfiltercourses || in_array($tagcontextid, $filtercoursecontextids)) { // Add the tag to the list of course tags if we aren't being // asked to filter or if this tag is in the list of courses // we're being asked to filter by. $sortedtagobjects->coursetagobjects[] = $tagobject; $sortedtagobjects->coursetags[$tagobject->id] = $tagobject->get_display_name(); } } else { // All non course context level tag instances or tags in the question // context 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) { global $PAGE; return $PAGE->get_renderer('question', 'bank')->qtype_icon($question->qtype); } /** * Creates a stamp that uniquely identifies this version of the question * * In future we want this to use a hash of the question data to guarantee that * identical versions have the same version stamp. * * @param object $question * @return string A unique version stamp */ function question_hash($question) { return make_unique_id_code(); } /// 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. */ function sort_categories_by_tree(&$categories, $id = 0, $level = 1) { global $DB; $children = array(); $keys = array_keys($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; } /** * Private method, only for the use of add_indented_names(). * * Recursively adds an indentedname field to each category, starting with the category * with id $id, and dealing with that category and all its children, and * return a new array, with those categories in the right order. * * @param array $categories an array of categories which has had childids * fields added by flatten_category_tree(). Passed by reference for * performance only. It is not modfied. * @param int $id the category to start the indenting process from. * @param int $depth the indent depth. Used in recursive calls. * @return array a new array of categories, in the right order for the tree. */ function flatten_category_tree(&$categories, $id, $depth = 0, $nochildrenof = -1) { // Indent the name of this category. $newcategories = array(); $newcategories[$id] = $categories[$id]; $newcategories[$id]->indentedname = str_repeat(' ', $depth) . $categories[$id]->name; // Recursively indent the children. foreach ($categories[$id]->childids as $childid) { if ($childid != $nochildrenof) { $newcategories = $newcategories + flatten_category_tree( $categories, $childid, $depth + 1, $nochildrenof); } } // Remove the childids array that were temporarily added. unset($newcategories[$id]->childids); return $newcategories; } /** * Format categories into an indented list reflecting the tree structure. * * @param array $categories An array of category objects, for example from the. * @return array The formatted list of categories. */ function add_indented_names($categories, $nochildrenof = -1) { // Add an array to each category to hold the child category ids. This array // will be removed again by flatten_category_tree(). It should not be used // outside these two functions. foreach (array_keys($categories) as $id) { $categories[$id]->childids = array(); } // Build the tree structure, and record which categories are top-level. // We have to be careful, because the categories array may include published // categories from other courses, but not their parents. $toplevelcategoryids = array(); foreach (array_keys($categories) as $id) { if (!empty($categories[$id]->parent) && array_key_exists($categories[$id]->parent, $categories)) { $categories[$categories[$id]->parent]->childids[] = $id; } else { $toplevelcategoryids[] = $id; } } // Flatten the tree to and add the indents. $newcategories = array(); foreach ($toplevelcategoryids as $id) { $newcategories = $newcategories + flatten_category_tree( $categories, $id, 0, $nochildrenof); } return $newcategories; } /** * Output a select menu of question categories. * * Categories from this course and (optionally) published categories from other courses * are included. Optionally, only categories the current user may edit can be included. * * @param integer $courseid the id of the course to get the categories for. * @param integer $published if true, include publised categories from other courses. * @param integer $only_editable if true, exclude categories this user is not allowed to edit. * @param integer $selected optionally, the id of a category to be selected by * default in the dropdown. */ function question_category_select_menu($contexts, $top = false, $currentcat = 0, $selected = "", $nochildrenof = -1) { $categoriesarray = question_category_options($contexts, $top, $currentcat, false, $nochildrenof); if ($selected) { $choose = ''; } else { $choose = 'choosedots'; } $options = array(); foreach ($categoriesarray as $group => $opts) { $options[] = array($group => $opts); } echo html_writer::label(get_string('questioncategory', 'core_question'), 'id_movetocategory', false, array('class' => 'accesshide')); $attrs = array( 'id' => 'id_movetocategory', 'class' => 'custom-select', 'data-action' => 'toggle', 'data-togglegroup' => 'qbank', 'data-toggle' => 'action', 'disabled' => true, ); echo html_writer::select($options, 'category', $selected, $choose, $attrs); } /** * @param integer $contextid a context id. * @return object the default question category for that context, or false if none. */ function question_get_default_category($contextid) { global $DB; $category = $DB->get_records_select('question_categories', 'contextid = ? AND parent <> 0', array($contextid), 'id', '*', 0, 1); if (!empty($category)) { return reset($category); } else { return false; } } /** * 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', array('contextid' => $contextid, 'parent' => 0)); if (!$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) { 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; } /** * Gets the default category in the most specific context. * If no categories exist yet then default ones are created in all contexts. * * @param array $contexts The context objects for this context and all parent contexts. * @return object The default category - the category in the course context */ function question_make_default_categories($contexts) { global $DB; static $preferredlevels = array( CONTEXT_COURSE => 4, CONTEXT_MODULE => 3, CONTEXT_COURSECAT => 2, CONTEXT_SYSTEM => 1, ); $toreturn = null; $preferredness = 0; // If it already exists, just return it. foreach ($contexts as $key => $context) { $topcategory = question_get_top_category($context->id, true); if (!$exists = $DB->record_exists("question_categories", array('contextid' => $context->id, 'parent' => $topcategory->id))) { // Otherwise, we need to make one $category = new stdClass(); $contextname = $context->get_context_name(false, true); // Max length of name field is 255. $category->name = shorten_text(get_string('defaultfor', 'question', $contextname), 255); $category->info = get_string('defaultinfofor', 'question', $contextname); $category->contextid = $context->id; $category->parent = $topcategory->id; // By default, all categories get this number, and are sorted alphabetically. $category->sortorder = 999; $category->stamp = make_unique_id_code(); $category->id = $DB->insert_record('question_categories', $category); } else { $category = question_get_default_category($context->id); } $thispreferredness = $preferredlevels[$context->contextlevel]; if (has_any_capability(array('moodle/question:usemine', 'moodle/question:useall'), $context)) { $thispreferredness += 10; } if ($thispreferredness > $preferredness) { $toreturn = $category; $preferredness = $thispreferredness; } } if (!is_null($toreturn)) { $toreturn = clone($toreturn); } return $toreturn; } /** * Get all the category objects, including a count of the number of questions in that category, * for all the categories in the lists $contexts. * * @param mixed $contexts either a single contextid, or a comma-separated list of context ids. * @param string $sortorder used as the ORDER BY clause in the select statement. * @param bool $top Whether to return the top categories or not. * @return array of category objects. */ function get_categories_for_contexts($contexts, $sortorder = 'parent, sortorder, name ASC', $top = false) { global $DB; $topwhere = $top ? '' : 'AND c.parent <> 0'; return $DB->get_records_sql(" SELECT c.*, (SELECT count(1) FROM {question} q WHERE c.id = q.category AND q.hidden='0' AND q.parent='0') AS questioncount FROM {question_categories} c WHERE c.contextid IN ($contexts) $topwhere ORDER BY $sortorder"); } /** * Output an array of question categories. * * @param array $contexts The list of contexts. * @param bool $top Whether to return the top categories or not. * @param int $currentcat * @param bool $popupform * @param int $nochildrenof * @return array */ function question_category_options($contexts, $top = false, $currentcat = 0, $popupform = false, $nochildrenof = -1) { global $CFG; $pcontexts = array(); foreach ($contexts as $context) { $pcontexts[] = $context->id; } $contextslist = join(', ', $pcontexts); $categories = get_categories_for_contexts($contextslist, 'parent, sortorder, name ASC', $top); if ($top) { $categories = question_fix_top_names($categories); } $categories = question_add_context_in_key($categories); $categories = add_indented_names($categories, $nochildrenof); // sort cats out into different contexts $categoriesarray = array(); foreach ($pcontexts as $contextid) { $context = context::instance_by_id($contextid); $contextstring = $context->get_context_name(true, true); foreach ($categories as $category) { if ($category->contextid == $contextid) { $cid = $category->id; if ($currentcat != $cid || $currentcat == 0) { $a = new stdClass; $a->name = format_string($category->indentedname, true, array('context' => $context)); if ($category->idnumber !== null && $category->idnumber !== '') { $a->idnumber = s($category->idnumber); } if (!empty($category->questioncount)) { $a->questioncount = $category->questioncount; } if (isset($a->idnumber) && isset($a->questioncount)) { $formattedname = get_string('categorynamewithidnumberandcount', 'question', $a); } else if (isset($a->idnumber)) { $formattedname = get_string('categorynamewithidnumber', 'question', $a); } else if (isset($a->questioncount)) { $formattedname = get_string('categorynamewithcount', 'question', $a); } else { $formattedname = $a->name; } $categoriesarray[$contextstring][$cid] = $formattedname; } } } } if ($popupform) { $popupcats = array(); foreach ($categoriesarray as $contextstring => $optgroup) { $group = array(); foreach ($optgroup as $key => $value) { $key = str_replace($CFG->wwwroot, '', $key); $group[$key] = $value; } $popupcats[] = array($contextstring => $group); } return $popupcats; } else { return $categoriesarray; } } function question_add_context_in_key($categories) { $newcatarray = array(); foreach ($categories as $id => $category) { $category->parent = "$category->parent,$category->contextid"; $category->id = "$category->id,$category->contextid"; $newcatarray["$id,$category->contextid"] = $category; } return $newcatarray; } /** * Finds top categories in the given categories hierarchy and replace their name with a proper localised string. * * @param array $categories An array of question categories. * @return array The same question category list given to the function, with the top category names being translated. */ function question_fix_top_names($categories) { foreach ($categories as $id => $category) { if ($category->parent == 0) { $context = context::instance_by_id($category->contextid); $categories[$id]->name = get_string('topfor', 'question', $context->get_context_name(false)); } } return $categories; } /** * @return array of question category ids of the category and all subcategories. */ function question_categorylist($categoryid) { global $DB; // final list of category IDs $categorylist = array(); // a list of category IDs to check for any sub-categories $subcategories = array($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] = $subcategory; } list ($in, $params) = $DB->get_in_or_equal($subcategories); $subcategories = $DB->get_records_select_menu('question_categories', "parent $in", $params, NULL, 'id,id AS id2'); } return $categorylist; } /** * Get all parent categories of a given question category in decending 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) { global $DB; $parent = $DB->get_field('question_categories', 'parent', array('id' => $categoryid)); if (!$parent) { return []; } $categorylist = [$parent]; $currentid = $parent; while ($currentid) { $currentid = $DB->get_field('question_categories', 'parent', array('id' => $currentid)); if ($currentid) { $categorylist[] = $currentid; } } // Present the list in decending order (the top category at the top). $categorylist = array_reverse($categorylist); return $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) { 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) { // 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}"; return $export_name; } /** * Converts contextlevels to strings and back to help with reading/writing contexts * to/from import/export files. * * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com} * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class context_to_string_translator{ /** * @var array used to translate between contextids and strings for this context. */ protected $contexttostringarray = array(); public function __construct($contexts) { $this->generate_context_to_string_array($contexts); } public function context_to_string($contextid) { return $this->contexttostringarray[$contextid]; } public function string_to_context($contextname) { $contextid = array_search($contextname, $this->contexttostringarray); return $contextid; } protected function generate_context_to_string_array($contexts) { if (!$this->contexttostringarray) { $catno = 1; foreach ($contexts as $context) { switch ($context->contextlevel) { case CONTEXT_MODULE : $contextstring = 'module'; break; case CONTEXT_COURSE : $contextstring = 'course'; break; case CONTEXT_COURSECAT : $contextstring = "cat$catno"; $catno++; break; case CONTEXT_SYSTEM : $contextstring = 'system'; break; } $this->contexttostringarray[$context->id] = $contextstring; } } } } /** * 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 $question? * @throws coding_exception */ function question_has_capability_on($questionorid, $cap, $notused = -1) { 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) && isset($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()); } // Well, at least we tried. Seems that we really have to read from DB. $question = $DB->get_record_sql('SELECT q.id, q.createdby, qc.contextid FROM {question} q JOIN {question_categories} qc ON q.category = qc.id WHERE q.id = :id', ['id' => $questionid]); } } if (!isset($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. $capabilitieswithallandmine = ['edit' => 1, 'view' => 1, 'use' => 1, 'move' => 1, 'tag' => 1]; if (!isset($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', $context)); } } /** * Require capability on question. */ function question_require_capability_on($question, $cap) { if (!question_has_capability_on($question, $cap)) { print_error('nopermissions', '', '', $cap); } return true; } /** * @param object $context a context * @return string A URL for editing questions in this context. */ function question_edit_url($context) { global $CFG, $SITE; if (!has_any_capability(question_get_question_capabilities(), $context)) { return false; } $baseurl = $CFG->wwwroot . '/question/edit.php?'; $defaultcategory = question_get_default_category($context->id); 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; } } /** * Adds question bank setting links to the given navigation node if caps are met. * * @param navigation_node $navigationnode The navigation node to add the question branch to * @param object $context * @return navigation_node Returns the question branch that was added */ function question_extend_settings_navigation(navigation_node $navigationnode, $context) { global $PAGE; if ($context->contextlevel == CONTEXT_COURSE) { $params = array('courseid'=>$context->instanceid); } else if ($context->contextlevel == CONTEXT_MODULE) { $params = array('cmid'=>$context->instanceid); } else { return; } if (($cat = $PAGE->url->param('cat')) && preg_match('~\d+,\d+~', $cat)) { $params['cat'] = $cat; } $questionnode = $navigationnode->add(get_string('questionbank', 'question'), new moodle_url('/question/edit.php', $params), navigation_node::TYPE_CONTAINER, null, 'questionbank'); $contexts = new question_edit_contexts($context); if ($contexts->have_one_edit_tab_cap('questions')) { $questionnode->add(get_string('questions', 'question'), new moodle_url( '/question/edit.php', $params), navigation_node::TYPE_SETTING, null, 'questions'); } if ($contexts->have_one_edit_tab_cap('categories')) { $questionnode->add(get_string('categories', 'question'), new moodle_url( '/question/category.php', $params), navigation_node::TYPE_SETTING, null, 'categories'); } if ($contexts->have_one_edit_tab_cap('import')) { $questionnode->add(get_string('import', 'question'), new moodle_url( '/question/import.php', $params), navigation_node::TYPE_SETTING, null, 'import'); } if ($contexts->have_one_edit_tab_cap('export')) { $questionnode->add(get_string('export', 'question'), new moodle_url( '/question/export.php', $params), navigation_node::TYPE_SETTING, null, 'export'); } return $questionnode; } /** * @return array all the capabilities that relate to accessing particular questions. */ function question_get_question_capabilities() { return array( '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', ); } /** * @return array all the question bank capabilities. */ function question_get_all_capabilities() { $caps = question_get_question_capabilities(); $caps[] = 'moodle/question:managecategory'; $caps[] = 'moodle/question:flag'; return $caps; } /** * Tracks all the contexts related to the one where we are currently editing * questions, and provides helper methods to check permissions. * * @copyright 2007 Jamie Pratt me@jamiep.org * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class question_edit_contexts { public static $caps = array( 'editq' => array('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'), 'questions'=>array('moodle/question:add', 'moodle/question:editmine', 'moodle/question:editall', 'moodle/question:viewmine', 'moodle/question:viewall', 'moodle/question:movemine', 'moodle/question:moveall'), 'categories'=>array('moodle/question:managecategory'), 'import'=>array('moodle/question:add'), 'export'=>array('moodle/question:viewall', 'moodle/question:viewmine')); protected $allcontexts; /** * Constructor * @param context the current context. */ public function __construct(context $thiscontext) { $this->allcontexts = array_values($thiscontext->get_parent_contexts(true)); } /** * @return context[] all parent contexts */ public function all() { return $this->allcontexts; } /** * @return context lowest context which must be either the module or course context */ public function lowest() { return $this->allcontexts[0]; } /** * @param string $cap capability * @return context[] parent contexts having capability, zero based index */ public function having_cap($cap) { $contextswithcap = array(); foreach ($this->allcontexts as $context) { if (has_capability($cap, $context)) { $contextswithcap[] = $context; } } return $contextswithcap; } /** * @param array $caps capabilities * @return context[] parent contexts having at least one of $caps, zero based index */ public function having_one_cap($caps) { $contextswithacap = array(); foreach ($this->allcontexts as $context) { foreach ($caps as $cap) { if (has_capability($cap, $context)) { $contextswithacap[] = $context; break; //done with caps loop } } } return $contextswithacap; } /** * @param string $tabname edit tab name * @return context[] parent contexts having at least one of $caps, zero based index */ public function having_one_edit_tab_cap($tabname) { return $this->having_one_cap(self::$caps[$tabname]); } /** * @return context[] those contexts where a user can add a question and then use it. */ public function having_add_and_use() { $contextswithcap = array(); foreach ($this->allcontexts as $context) { if (!has_capability('moodle/question:add', $context)) { continue; } if (!has_any_capability(array('moodle/question:useall', 'moodle/question:usemine'), $context)) { continue; } $contextswithcap[] = $context; } return $contextswithcap; } /** * Has at least one parent context got the cap $cap? * * @param string $cap capability * @return boolean */ public function have_cap($cap) { return (count($this->having_cap($cap))); } /** * Has at least one parent context got one of the caps $caps? * * @param array $caps capability * @return boolean */ public function have_one_cap($caps) { foreach ($caps as $cap) { if ($this->have_cap($cap)) { return true; } } return false; } /** * Has at least one parent context got one of the caps for actions on $tabname * * @param string $tabname edit tab name * @return boolean */ public function have_one_edit_tab_cap($tabname) { return $this->have_one_cap(self::$caps[$tabname]); } /** * Throw error if at least one parent context hasn't got the cap $cap * * @param string $cap capability */ public function require_cap($cap) { if (!$this->have_cap($cap)) { print_error('nopermissions', '', '', $cap); } } /** * Throw error if at least one parent context hasn't got one of the caps $caps * * @param array $caps capabilities */ public function require_one_cap($caps) { if (!$this->have_one_cap($caps)) { $capsstring = join(', ', $caps); print_error('nopermissions', '', '', $capsstring); } } /** * Throw error if at least one parent context hasn't got one of the caps $caps * * @param string $tabname edit tab name */ public function require_one_edit_tab_cap($tabname) { if (!$this->have_one_edit_tab_cap($tabname)) { print_error('nopermissions', '', '', 'access question edit tab '.$tabname); } } } /** * 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) { $idsstr = ''; if (!empty($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) { $path = "preview/$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. * * @package core_question * @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 $options additional options affecting the file serving */ function question_pluginfile($course, $context, $component, $filearea, $args, $forcedownload, array $options=array()) { 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'); $contexts = new question_edit_contexts($context); // check export capability $contexts->require_one_edit_tab_cap('export'); $category_id = (int)array_shift($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' => $category_id))) { 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(); print_error('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 ($module === 'core_question_preview') { require_once($CFG->dirroot . '/question/previewlib.php'); return 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. * * @package core_files * @category files * @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 = array()) { global $DB; // Verify that contextid matches the question. $question = $DB->get_record_sql(' SELECT q.*, qc.contextid FROM {question} q JOIN {question_categories} qc ON qc.id = q.category WHERE q.id = :id AND qc.contextid = :contextid', array('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); } /** * Create url for question export * * @param int $contextid, current context * @param int $categoryid, categoryid * @param string $format * @param string $withcategories * @param string $ithcontexts * @param moodle_url export file url */ function question_make_export_url($contextid, $categoryid, $format, $withcategories, $withcontexts, $filename) { global $CFG; $urlbase = "$CFG->wwwroot/pluginfile.php"; return moodle_url::make_file_url($urlbase, "/$contextid/question/export/{$categoryid}/{$format}/{$withcategories}" . "/{$withcontexts}/{$filename}", true); } /** * Get the URL to export a single question (exportone.php). * * @param stdClass|question_definition $question the question definition as obtained from * question_bank::load_question_data() or question_bank::make_question(). * (Only ->id and ->contextid are used.) * @return moodle_url the requested URL. */ function question_get_export_single_question_url($question) { $params = ['id' => $question->id, 'sesskey' => sesskey()]; $context = context::instance_by_id($question->contextid); switch ($context->contextlevel) { case CONTEXT_MODULE: $params['cmid'] = $context->instanceid; break; case CONTEXT_COURSE: $params['courseid'] = $context->instanceid; break; default: $params['courseid'] = SITEID; } return new moodle_url('/question/exportone.php', $params); } /** * Return a list of page types * @param string $pagetype current page type * @param stdClass $parentcontext Block's parent context * @param stdClass $currentcontext Current context of block */ function question_page_type_list($pagetype, $parentcontext, $currentcontext) { global $CFG; $types = array( 'question-*'=>get_string('page-question-x', 'question'), 'question-edit'=>get_string('page-question-edit', 'question'), 'question-category'=>get_string('page-question-category', 'question'), 'question-export'=>get_string('page-question-export', 'question'), 'question-import'=>get_string('page-question-import', 'question') ); if ($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) { 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 $DB; // The the old idnumber is not of the right form, bail now. if (!preg_match('~\d+$~', $oldidnumber, $matches)) { return null; } // Find all used idnumbers in one DB query. $usedidnumbers = $DB->get_records_select_menu('question', 'category = ? AND idnumber IS NOT NULL', [$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; }