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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Privacy Subsystem implementation for core_question.
*
* @package core_question
* @category privacy
* @copyright 2018 Andrew Nicols <andrew@nicols.co.uk>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_question\privacy;
use core_privacy\local\metadata\collection;
use core_privacy\local\request\approved_contextlist;
use core_privacy\local\request\approved_userlist;
use core_privacy\local\request\contextlist;
use core_privacy\local\request\transform;
use core_privacy\local\request\userlist;
use core_privacy\local\request\writer;
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir . '/questionlib.php');
require_once($CFG->dirroot . '/question/format.php');
require_once($CFG->dirroot . '/question/editlib.php');
require_once($CFG->dirroot . '/question/engine/datalib.php');
/**
* Privacy Subsystem implementation for core_question.
*
* @copyright 2018 Andrew Nicols <andrew@nicols.co.uk>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class provider implements
// This component has data.
// We need to return all question information where the user is
// listed in either the question.createdby or question.modifiedby fields.
// We may also need to fetch this informtion from individual plugins in some cases.
// e.g. to fetch the full and other question-specific meta-data.
\core_privacy\local\metadata\provider,
// This is a subsysytem which provides information to core.
\core_privacy\local\request\subsystem\provider,
// This is a subsysytem which provides information to plugins.
\core_privacy\local\request\subsystem\plugin_provider,
// This plugin is capable of determining which users have data within it.
\core_privacy\local\request\core_userlist_provider,
// This plugin is capable of determining which users have data within it for the plugins it provides data to.
\core_privacy\local\request\shared_userlist_provider
{
/**
* Describe the types of data stored by the question subsystem.
*
* @param collection $items The collection to add metadata to.
* @return collection The array of metadata
*/
public static function get_metadata(collection $items) : collection {
// Other tables link against it.
// The 'question_usages' table does not contain any user data.
// The table links the but doesn't store itself.
// The 'question_attempts' table contains data about question attempts.
// It does not contain any user ids - these are stored by the caller.
$items->add_database_table('question_attempts', [
'flagged' => 'privacy:metadata:database:question_attempts:flagged',
'responsesummary' => 'privacy:metadata:database:question_attempts:responsesummary',
'timemodified' => 'privacy:metadata:database:question_attempts:timemodified',
], 'privacy:metadata:database:question_attempts');;
// The 'question_attempt_steps' table contains data about changes to the state of a question attempt.
$items->add_database_table('question_attempt_steps', [
'state' => 'privacy:metadata:database:question_attempt_steps:state',
'timecreated' => 'privacy:metadata:database:question_attempt_steps:timecreated',
'fraction' => 'privacy:metadata:database:question_attempt_steps:fraction',
'userid' => 'privacy:metadata:database:question_attempt_steps:userid',
], 'privacy:metadata:database:question_attempt_steps');
// The 'question_attempt_step_data' table contains specific all metadata for each state.
$items->add_database_table('question_attempt_step_data', [
'name' => 'privacy:metadata:database:question_attempt_step_data:name',
'value' => 'privacy:metadata:database:question_attempt_step_data:value',
], 'privacy:metadata:database:question_attempt_step_data');
// These are all part of the set of the question definition
// The 'question' table is used to store instances of each question.
// It contains a createdby and modifiedby which related to specific users.
$items->add_database_table('question', [
'name' => 'privacy:metadata:database:question:name',
'questiontext' => 'privacy:metadata:database:question:questiontext',
'generalfeedback' => 'privacy:metadata:database:question:generalfeedback',
'timecreated' => 'privacy:metadata:database:question:timecreated',
'timemodified' => 'privacy:metadata:database:question:timemodified',
'createdby' => 'privacy:metadata:database:question:createdby',
'modifiedby' => 'privacy:metadata:database:question:modifiedby',
], 'privacy:metadata:database:question');
// The 'question_answers' table is used to store the set of answers, with appropriate feedback for each question.
// It does not contain user data.
// The 'question_hints' table is used to store hints about the correct answer for a question.
// It does not contain user data.
// The 'question_categories' table contains structural information about how questions are presented in the UI.
// It does not contain user data.
// The 'question_statistics' table contains aggregated statistics about responses.
// It does not contain any identifiable user data.
// The question subsystem makes use of the qtype, qformat, and qbehaviour plugin types.
$items->add_plugintype_link('qtype', [], 'privacy:metadata:link:qtype');
$items->add_plugintype_link('qformat', [], 'privacy:metadata:link:qformat');
$items->add_plugintype_link('qbehaviour', [], 'privacy:metadata:link:qbehaviour');
return $items;
}
/**
* Export the data for all question attempts on this question usage.
*
* Where a user is the owner of the usage, then the full detail of that usage will be included.
* Where a user has been involved in the usage, but it is not their own usage, then only their specific
* involvement will be exported.
*
* @param int $userid The userid to export.
* @param \context $context The context that the question was used within.
* @param array $usagecontext The subcontext of this usage.
* @param int $usage The question usage ID.
* @param \question_display_options $options The display options used for formatting.
* @param bool $isowner Whether the user being exported is the user who used the question.
*/
public static function export_question_usage(
int $userid,
\context $context,
array $usagecontext,
int $usage,
\question_display_options $options,
bool $isowner
) {
// Determine the questions in this usage.
$quba = \question_engine::load_questions_usage_by_activity($usage);
$basepath = $usagecontext;
$questionscontext = array_merge($usagecontext, [
get_string('questions', 'core_question'),
]);
foreach ($quba->get_attempt_iterator() as $qa) {
$question = $qa->get_question(false);
$slotno = $qa->get_slot();
$questionnocontext = array_merge($questionscontext, [$slotno]);
if ($isowner) {
// This user is the overal owner of the question attempt and all data wil therefore be exported.
//
// Respect _some_ of the question_display_options to ensure that they don't have access to
// generalfeedback and mark if the display options prevent this.
// This is defensible because they can submit questions without completing a quiz and perform an SAR to
// get prior access to the feedback and mark to improve upon it.
// Export the response.
$data = (object) [
'name' => $question->name,
'question' => $qa->get_question_summary(),
'answer' => $qa->get_response_summary(),
'timemodified' => transform::datetime($qa->timemodified),
];
if ($options->marks >= \question_display_options::MARK_AND_MAX) {
$data->mark = $qa->format_mark($options->markdp);
}
if ($options->flags != \question_display_options::HIDDEN) {
$data->flagged = transform::yesno($qa->is_flagged());
}
if ($options->generalfeedback != \question_display_options::HIDDEN) {
$data->generalfeedback = $question->format_generalfeedback($qa);
}
if ($options->manualcomment != \question_display_options::HIDDEN) {
if ($qa->has_manual_comment()) {
// Note - the export of the step data will ensure that the files are exported.
// No need to do it again here.
list($comment, $commentformat, $step) = $qa->get_manual_comment();
$comment = writer::with_context($context)
->rewrite_pluginfile_urls(
$questionnocontext,
'question',
'response_bf_comment',
$step->get_id(),
$comment
);
$data->comment = $qa->get_behaviour(false)->format_comment($comment, $commentformat);
}
}
writer::with_context($context)
->export_data($questionnocontext, $data);
// Export the step data.
static::export_question_attempt_steps($userid, $context, $questionnocontext, $qa, $options, $isowner);
}
}
}
/**
* Export the data for each step transition for each question in each question attempt.
*
* Where a user is the owner of the usage, then all steps in the question usage will be exported.
* Where a user is not the owner, but has been involved in the usage, then only their specific
* involvement will be exported.
*
* @param int $userid The user to export for
* @param \context $context The context that the question was used within.
* @param array $questionnocontext The subcontext of this question number.
* @param \question_attempt $qa The attempt being checked
* @param \question_display_options $options The display options used for formatting.
* @param bool $isowner Whether the user being exported is the user who used the question.
*/
public static function export_question_attempt_steps(
int $userid,
\context $context,
array $questionnocontext,
\question_attempt $qa,
\question_display_options $options,
$isowner
) {
$attemptdata = (object) [
'steps' => [],
];
$stepno = 0;
foreach ($qa->get_step_iterator() as $i => $step) {
$stepno++;
if ($isowner || ($step->get_user_id() != $userid)) {
// The user is the owner, or the author of the step.
$restrictedqa = new \question_attempt_with_restricted_history($qa, $i, null);
$stepdata = (object) [
// Note: Do not include the user here.
'time' => transform::datetime($step->get_timecreated()),
'action' => $qa->summarise_action($step),
];
if ($options->marks >= \question_display_options::MARK_AND_MAX) {
$stepdata->mark = $qa->format_fraction_as_mark($step->get_fraction(), $options->markdp);
}
if ($options->correctness != \question_display_options::HIDDEN) {
$stepdata->state = $restrictedqa->get_state_string($options->correctness);
}
if ($step->has_behaviour_var('comment')) {
$comment = $step->get_behaviour_var('comment');
$commentformat = $step->get_behaviour_var('commentformat');
if (empty(trim($comment))) {
// Skip empty comments.
continue;
}
// Format the comment.
$comment = writer::with_context($context)
->rewrite_pluginfile_urls(
$questionnocontext,
'question',
'response_bf_comment',
$step->get_id(),
$comment
);
// Export any files associated with the comment files area.
writer::with_context($context)
->export_area_files(
$questionnocontext,
'question',
"response_bf_comment",
$step->get_id()
);
$stepdata->comment = $qa->get_behaviour(false)->format_comment($comment, $commentformat);
}
// Export any response files associated with this step.
foreach (\question_engine::get_all_response_file_areas() as $filearea) {
writer::with_context($context)
->export_area_files(
$questionnocontext,
'question',
$filearea,
$step->get_id()
);
}
$attemptdata->steps[$stepno] = $stepdata;
}
}
if (!empty($attemptdata->steps)) {
writer::with_context($context)
->export_related_data($questionnocontext, 'steps', $attemptdata);
}
}
/**
* Get the list of contexts where the specified user has either created, or edited a question.
*
* To export usage of a question, please call {@link provider::export_question_usage()} from the module which
* instantiated the usage of the question.
*
* @param int $userid The user to search.
* @return contextlist $contextlist The contextlist containing the list of contexts used in this plugin.
*/
public static function get_contexts_for_userid(int $userid) : contextlist {
$contextlist = new contextlist();
// A user may have created or updated a question.
// Questions are linked against a question category, which has a contextid field.
$sql = "SELECT cat.contextid
FROM {question} q
INNER JOIN {question_categories} cat ON cat.id = q.category
WHERE
q.createdby = :useridcreated OR
q.modifiedby = :useridmodified";
$params = [
'useridcreated' => $userid,
'useridmodified' => $userid,
];
$contextlist->add_from_sql($sql, $params);
return $contextlist;
}
/**
* Get the list of users who have data within a context.
*
* @param userlist $userlist The userlist containing the list of users who have data in this context/plugin combination.
*/
public static function get_users_in_context(userlist $userlist) {
$context = $userlist->get_context();
// A user may have created or updated a question.
// Questions are linked against a question category, which has a contextid field.
$sql = "SELECT q.createdby, q.modifiedby
FROM {question} q
JOIN {question_categories} cat
ON cat.id = q.category
WHERE cat.contextid = :contextid";
$params = [
'contextid' => $context->id
];
$userlist->add_from_sql('createdby', $sql, $params);
$userlist->add_from_sql('modifiedby', $sql, $params);
}
/**
* Determine related question usages for a user.
*
* @param string $prefix A unique prefix to add to the table alias
* @param string $component The name of the component to fetch usages for.
* @param string $joinfield The SQL field name to use in the JOIN ON - e.g. q.usageid
* @param int $userid The user to search.
* @return \qubaid_join
*/
public static function get_related_question_usages_for_user(string $prefix, string $component, string $joinfield, int $userid) : \qubaid_join {
return new \qubaid_join("
JOIN {question_usages} {$prefix}_qu ON {$prefix}_qu.id = {$joinfield}
AND {$prefix}_qu.component = :{$prefix}_usagecomponent
JOIN {question_attempts} {$prefix}_qa ON {$prefix}_qa.questionusageid = {$prefix}_qu.id
JOIN {question_attempt_steps} {$prefix}_qas ON {$prefix}_qas.questionattemptid = {$prefix}_qa.id",
"{$prefix}_qu.id",
"{$prefix}_qas.userid = :{$prefix}_stepuserid",
[
"{$prefix}_stepuserid" => $userid,
"{$prefix}_usagecomponent" => $component,
]);
}
/**
* Add the list of users who have rated in the specified constraints.
*
* @param userlist $userlist The userlist to add the users to.
* @param string $prefix A unique prefix to add to the table alias to avoid interference with your own sql.
* @param string $insql The SQL to use in a sub-select for the question_usages.id query.
* @param array $params The params required for the insql.
* @param int|null $contextid An optional context id, in case the $sql query is not already filtered by that.
*/
public static function get_users_in_context_from_sql(userlist $userlist, string $prefix, string $insql, $params,
int $contextid = null) {
$sql = "SELECT {$prefix}_qas.userid
FROM {question_attempt_steps} {$prefix}_qas
JOIN {question_attempts} {$prefix}_qa ON {$prefix}_qas.questionattemptid = {$prefix}_qa.id
JOIN {question_usages} {$prefix}_qu ON {$prefix}_qa.questionusageid = {$prefix}_qu.id
WHERE {$prefix}_qu.id IN ({$insql})";
if ($contextid) {
$sql .= " AND {$prefix}_qu.contextid = :{$prefix}_contextid";
$params["{$prefix}_contextid"] = $contextid;
}
$userlist->add_from_sql('userid', $sql, $params);
}
/**
* Export all user data for the specified user, in the specified contexts.
*
* @param approved_contextlist $contextlist The approved contexts to export information for.
*/
public static function export_user_data(approved_contextlist $contextlist) {
global $CFG, $DB, $SITE;
if (empty($contextlist)) {
return;
}
// Use the Moodle XML Data format.
// It is the only lossless format that we support.
$format = "xml";
require_once($CFG->dirroot . "/question/format/{$format}/format.php");
// THe export system needs questions in a particular format.
// The easiest way to fetch these is with get_questions_category() which takes the details of a question
// category.
// We fetch the root question category for each context and the get_questions_category function recurses to
// After fetching them, we filter out any not created or modified by the requestor.
$user = $contextlist->get_user();
$userid = $user->id;
list($contextsql, $contextparams) = $DB->get_in_or_equal($contextlist->get_contextids(), SQL_PARAMS_NAMED);
$categories = $DB->get_records_select('question_categories', "contextid {$contextsql} AND parent = 0", $contextparams);
$classname = "qformat_{$format}";
foreach ($categories as $category) {
$context = \context::instance_by_id($category->contextid);
$questions = get_questions_category($category, true);
$questions = array_filter($questions, function($question) use ($userid) {
return ($question->createdby == $userid) || ($question->modifiedby == $userid);
}, ARRAY_FILTER_USE_BOTH);
if (empty($questions)) {
continue;
}
$qformat = new $classname();
$qformat->setQuestions($questions);
$qformat->setContexts([$context]);
$qformat->setContexttofile(true);
// We do not know which course this belongs to, and it's not actually used except in error, so use Site.
$qformat->setCourse($SITE);
$content = '';
if ($qformat->exportpreprocess()) {
$content = $qformat->exportprocess(false);
}
$subcontext = [
get_string('questionbank', 'core_question'),
];
writer::with_context($context)->export_custom_file($subcontext, 'questions.xml', $content);
}
}
/**
* Delete all data for all users in the specified context.
*
* @param context $context The specific context to delete data for.
*/
public static function delete_data_for_all_users_in_context(\context $context) {
global $DB;
// Questions are considered to be 'owned' by the institution, even if they were originally written by a specific
// user. They are still exported in the list of a users data, but they are not removed.
// The userid is instead anonymised.
$DB->set_field_select('question', 'createdby', 0,
'category IN (SELECT id FROM {question_categories} WHERE contextid = :contextid)',
[
'contextid' => $context->id,
]);
$DB->set_field_select('question', 'modifiedby', 0,
'category IN (SELECT id FROM {question_categories} WHERE contextid = :contextid)',
[
'contextid' => $context->id,
]);
}
/**
* Delete all user data for the specified user, in the specified contexts.
*
* @param approved_contextlist $contextlist The approved contexts and user information to delete information for.
*/
public static function delete_data_for_user(approved_contextlist $contextlist) {
global $DB;
// Questions are considered to be 'owned' by the institution, even if they were originally written by a specific
// user. They are still exported in the list of a users data, but they are not removed.
// The userid is instead anonymised.
list($contextsql, $contextparams) = $DB->get_in_or_equal($contextlist->get_contextids(), SQL_PARAMS_NAMED);
$contextparams['createdby'] = $contextlist->get_user()->id;
$DB->set_field_select('question', 'createdby', 0, "
category IN (SELECT id FROM {question_categories} WHERE contextid {$contextsql})
AND createdby = :createdby", $contextparams);
list($contextsql, $contextparams) = $DB->get_in_or_equal($contextlist->get_contextids(), SQL_PARAMS_NAMED);
$contextparams['modifiedby'] = $contextlist->get_user()->id;
$DB->set_field_select('question', 'modifiedby', 0, "
category IN (SELECT id FROM {question_categories} WHERE contextid {$contextsql})
AND modifiedby = :modifiedby", $contextparams);
}
/**
* Delete multiple users within a single context.
*
* @param approved_userlist $userlist The approved context and user information to delete information for.
*/
public static function delete_data_for_users(approved_userlist $userlist) {
global $DB;
// Questions are considered to be 'owned' by the institution, even if they were originally written by a specific
// user. They are still exported in the list of a users data, but they are not removed.
// The userid is instead anonymised.
$context = $userlist->get_context();
$userids = $userlist->get_userids();
list($createdbysql, $createdbyparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED);
list($modifiedbysql, $modifiedbyparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED);
$params = ['contextid' => $context->id];
$DB->set_field_select('question', 'createdby', 0, "
category IN (SELECT id FROM {question_categories} WHERE contextid = :contextid)
AND createdby {$createdbysql}", $params + $createdbyparams);
$DB->set_field_select('question', 'modifiedby', 0, "
category IN (SELECT id FROM {question_categories} WHERE contextid = :contextid)
AND modifiedby {$modifiedbysql}", $params + $modifiedbyparams);
}
}