first commit

question/bank/comment/amd/build/comment.min.js

@@ -0,0 +1,11 @@
+define("qbank_comment/comment",["exports","core/fragment","core/str","core/modal_events","core/modal_save_cancel"],(function(_exports,_fragment,_str,_modal_events,_modal_save_cancel){function _interopRequireDefault(obj){return obj&&obj.__esModule?obj:{default:obj}}
+/**
+   * Column selector js.
+   *
+   * @module    qbank_comment/comment
+   * @copyright 2021 Catalyst IT Australia Pty Ltd
+   * @author    Safat Shahin <safatshahin@catalyst-au.net>
+   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+   */Object.defineProperty(_exports,"__esModule",{value:!0}),_exports.init=void 0,_fragment=_interopRequireDefault(_fragment),_modal_events=_interopRequireDefault(_modal_events),_modal_save_cancel=_interopRequireDefault(_modal_save_cancel);_exports.init=()=>{const target=document.querySelector("#categoryquestions");null!==target&&target.addEventListener("click",(e=>{e.target.dataset.target&&e.target.dataset.target.includes("questioncommentpreview")&&(async(questionId,courseID,contextId)=>{const args={questionid:questionId,courseid:courseID},modal=await _modal_save_cancel.default.create({title:(0,_str.get_string)("commentheader","qbank_comment"),body:_fragment.default.loadFragment("qbank_comment","question_comment",contextId,args),large:!0,show:!0,buttons:{save:(0,_str.get_string)("addcomment","qbank_comment"),cancel:(0,_str.get_string)("close","qbank_comment")},removeOnClose:!0}),root=modal.getRoot();root.on(_modal_events.default.bodyRendered,(function(){document.querySelectorAll("div.comment-area a")[0].style.display="none"})),root.on("change","#question_comment_version_dropdown",(e=>{args.questionid=e.target.value,modal.setBody(_fragment.default.loadFragment("qbank_comment","question_comment",contextId,args))})),root.on(_modal_events.default.hidden,(()=>location.reload())),root.on(_modal_events.default.save,(function(e){e.preventDefault();const submitlink=document.querySelectorAll("div.comment-area a")[0],textarea=document.querySelectorAll("div.comment-area textarea")[0];textarea.value!=textarea.getAttribute("aria-label")&&""!=textarea.value&&submitlink.click()}))})(e.target.dataset.questionid,e.target.dataset.courseid,e.target.dataset.contextid)}))}}));
+
+//# sourceMappingURL=comment.min.js.map

question/bank/comment/amd/src/comment.js

@@ -0,0 +1,100 @@
+// 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/>.
+
+/**
+ * Column selector js.
+ *
+ * @module    qbank_comment/comment
+ * @copyright 2021 Catalyst IT Australia Pty Ltd
+ * @author    Safat Shahin <safatshahin@catalyst-au.net>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+import Fragment from 'core/fragment';
+import {get_string as getString} from 'core/str';
+import ModalEvents from 'core/modal_events';
+import SaveCancelModal from 'core/modal_save_cancel';
+
+/**
+ * Event listeners for the module.
+ *
+ * @method clickEvent
+ * @param {Number} questionId
+ * @param {Number} courseID
+ * @param {Number} contextId
+ */
+const commentEvent = async(questionId, courseID, contextId) => {
+    const args = {
+        questionid: questionId,
+        courseid: courseID
+    };
+    const modal = await SaveCancelModal.create({
+        title: getString('commentheader', 'qbank_comment'),
+        body: Fragment.loadFragment('qbank_comment', 'question_comment', contextId, args),
+        large: true,
+        show: true,
+        buttons: {
+            save: getString('addcomment', 'qbank_comment'),
+            cancel: getString('close', 'qbank_comment'),
+        },
+        removeOnClose: true,
+    });
+    const root = modal.getRoot();
+
+    // Don't display the default add comment link in the modal.
+    root.on(ModalEvents.bodyRendered, function() {
+        const submitlink = document.querySelectorAll("div.comment-area a")[0];
+        submitlink.style.display = 'none';
+    });
+
+    // Version selection event.
+    root.on('change', '#question_comment_version_dropdown', (e) =>{
+        args.questionid = e.target.value;
+        modal.setBody(Fragment.loadFragment('qbank_comment', 'question_comment', contextId, args));
+    });
+
+    // Reload the page when the modal is closed.
+    root.on(ModalEvents.hidden, () => location.reload());
+
+    // Handle adding the comment when the button in the modal is clicked.
+    root.on(ModalEvents.save, function(e) {
+        e.preventDefault();
+        const submitlink = document.querySelectorAll("div.comment-area a")[0];
+        const textarea = document.querySelectorAll("div.comment-area textarea")[0];
+
+        // Check there is a valid comment to add, and trigger adding if there is.
+        if (textarea.value != textarea.getAttribute('aria-label') && textarea.value != '') {
+            submitlink.click();
+        }
+
+    });
+};
+
+/**
+ * Entrypoint of the js.
+ *
+ * @method init
+ */
+export const init = () => {
+    const target = document.querySelector('#categoryquestions');
+    if (target !== null) {
+        target.addEventListener('click', (e) => {
+            if (e.target.dataset.target && e.target.dataset.target.includes('questioncommentpreview')) {
+                // Call for the event listener to listed for clicks in any comment count row.
+                commentEvent(e.target.dataset.questionid, e.target.dataset.courseid, e.target.dataset.contextid);
+            }
+        });
+    }
+};

question/bank/comment/backup/moodle2/backup_qbank_comment_plugin.class.php

@@ -0,0 +1,66 @@
+<?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/>.
+
+/**
+ * Provides the information to backup question comments.
+ *
+ * @package    qbank_comment
+ * @copyright   2021 Catalyst IT Australia Pty Ltd
+ * @author      Matt Porritt <mattp@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class backup_qbank_comment_plugin extends \backup_qbank_plugin {
+
+    /**
+     * Returns the comment information to attach to question element.
+     */
+    protected function define_question_plugin_structure() {
+
+        // Define the virtual plugin element with the condition to fulfill.
+        $plugin = $this->get_plugin_element();
+
+        // Create one standard named plugin element (the visible container).
+        $pluginwrapper = new backup_nested_element($this->get_recommended_name());
+
+        // Connect the visible container ASAP.
+        $plugin->add_child($pluginwrapper);
+
+        $comments = new backup_nested_element('comments');
+
+        $comment = new backup_nested_element('comment', ['id'], ['component', 'commentarea', 'itemid', 'contextid',
+                'content', 'format', 'userid', 'timecreated']);
+
+        $pluginwrapper->add_child($comments);
+        $comments->add_child($comment);
+
+        $comment->set_source_sql(
+            "SELECT c.*
+               FROM {comments} c
+              WHERE c.contextid = :contextid
+                AND c.component = 'qbank_comment'
+                AND c.commentarea = 'question'
+                AND c.itemid = :itemid",
+            [
+                'contextid' => backup_helper::is_sqlparam(context_system::instance()->id),
+                'itemid' => backup::VAR_PARENTID,
+            ]
+        );
+
+        $comment->annotate_ids('user', 'userid');
+
+        return $plugin;
+    }
+}

question/bank/comment/backup/moodle2/restore_qbank_comment_plugin.class.php

@@ -0,0 +1,58 @@
+<?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/>.
+
+/**
+ * Restore plugin class that provides the necessary information needed to restore comments for questions.
+ *
+ * @package    qbank_comment
+ * @copyright   2021 Catalyst IT Australia Pty Ltd
+ * @author      Matt Porritt <mattp@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class restore_qbank_comment_plugin extends restore_qbank_plugin {
+
+    /**
+     * Returns the paths to be handled by the plugin at question level.
+     */
+    protected function define_question_plugin_structure() {
+        return [
+            new restore_path_element('comment', $this->get_pathfor('/comments/comment'))
+        ];
+    }
+
+    /**
+     * Process the question comments element.
+     *
+     * @param array $data The comment data to restore.
+     */
+    public function process_comment($data) {
+        global $DB, $CFG;
+
+        $data = (object)$data;
+
+        $newquestionid = $this->get_new_parentid('question');
+        $questioncreated = (bool) $this->get_mappingid('question_created', $this->get_old_parentid('question'));
+        if (!$questioncreated) {
+            // This question already exists in the question bank. Nothing for us to do.
+            return;
+        }
+
+        if ($CFG->usecomments) {
+            $data->itemid = $newquestionid;
+            $DB->insert_record('comments', $data);
+        }
+    }
+}

question/bank/comment/classes/comment_count_column.php

@@ -0,0 +1,116 @@
+<?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/>.
+
+namespace qbank_comment;
+
+use core_question\local\bank\column_base;
+use question_bank;
+
+/**
+ * A column to show the number of comments.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class comment_count_column extends column_base {
+
+    /**
+     * @var bool Comments enabled or not from config.
+     */
+    protected $commentsenabled = true;
+
+    /**
+     * Load javascript module if enabled.
+     *
+     * @return void
+     */
+    public function init(): void {
+        parent::init();
+        $this->check_comments_status();
+        if ($this->commentsenabled) {
+            global $PAGE;
+            $PAGE->requires->js_call_amd('qbank_comment/comment', 'init');
+        }
+    }
+
+    /**
+     * Check if comments is turned on in the system or not.
+     */
+    protected function check_comments_status(): void {
+        global $CFG;
+        if (!$CFG->usecomments) {
+            $this->commentsenabled = false;
+        }
+    }
+
+    /**
+     * Get the name of the column, used internally.
+     *
+     * @return string
+     */
+    public function get_name(): string {
+        return 'commentcount';
+    }
+
+    /**
+     * Get the title of the column that will be displayed.
+     *
+     * @return string
+     */
+    public function get_title(): string {
+        return get_string('commentplural', 'qbank_comment');
+    }
+
+    /**
+     * Generate the content to be displayed.
+     *
+     * @param object $question The question object.
+     * @param string $rowclasses Classes that can be added.
+     */
+    protected function display_content($question, $rowclasses): void {
+        global $DB;
+        $syscontext = \context_system::instance();
+        $args = [
+            'component' => 'qbank_comment',
+            'commentarea' => 'question',
+            'itemid' => $question->id,
+            'contextid' => $syscontext->id,
+        ];
+        $commentcount = $DB->count_records('comments', $args);
+        $attributes = [];
+        if (question_has_capability_on($question, 'comment')) {
+            $target = 'questioncommentpreview_' . $question->id;
+            $attributes = [
+                'href' => '#',
+                'data-target' => $target,
+                'data-questionid' => $question->id,
+                'data-courseid' => $this->qbank->course->id,
+                'data-contextid' => $syscontext->id,
+            ];
+        }
+        echo \html_writer::tag('a', $commentcount, $attributes);
+    }
+
+    public function get_extra_classes(): array {
+        return ['pr-3'];
+    }
+
+    public function get_default_width(): int {
+        return 150;
+    }
+}

question/bank/comment/classes/event/comment_created.php

@@ -0,0 +1,51 @@
+<?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/>.
+
+namespace qbank_comment\event;
+
+/**
+ * qbank_comment comment created event.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class comment_created extends \core\event\comment_created {
+
+    /**
+     * Get URL related to the action, null in this case.
+     *
+     * @return null
+     */
+    public function get_url() {
+        return null;
+    }
+
+    /**
+     * Returns description of what happened.
+     *
+     * @return string
+     */
+    public function get_description() {
+        $a = new \stdClass();
+        $a->userid = $this->userid;
+        $a->objectid = $this->objectid;
+        $a->component = $this->component;
+        $a->itemid = $this->other['itemid'];
+        return get_string('comment_added', 'qbank_comment', $a);
+    }
+}

question/bank/comment/classes/event/comment_deleted.php

@@ -0,0 +1,51 @@
+<?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/>.
+
+namespace qbank_comment\event;
+
+/**
+ * qbank_comment comment deleted event.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class comment_deleted extends \core\event\comment_deleted {
+
+    /**
+     * Get URL related to the action, null in this case.
+     *
+     * @return null
+     */
+    public function get_url() {
+        return null;
+    }
+
+    /**
+     * Returns description of what happened.
+     *
+     * @return string
+     */
+    public function get_description() {
+        $a = new \stdClass();
+        $a->userid = $this->userid;
+        $a->objectid = $this->objectid;
+        $a->component = $this->component;
+        $a->itemid = $this->other['itemid'];
+        return get_string('comment_removed', 'qbank_comment', $a);
+    }
+}

question/bank/comment/classes/event/question_deleted_observer.php

@@ -0,0 +1,49 @@
+<?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/>.
+
+namespace qbank_comment\event;
+
+defined('MOODLE_INTERNAL') || die();
+
+require_once($CFG->dirroot . '/comment/lib.php');
+
+use core\event\question_deleted;
+
+/**
+ * Event observer for question deletion
+ *
+ * @package   qbank_comment
+ * @copyright 2023 onwards Catalyst IT EU {@link https://catalyst-eu.net}
+ * @author    Mark Johnson <mark.johnson@catalyst-eu.net>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class question_deleted_observer {
+
+    /**
+     * Delete any comments for the deleted question.
+     *
+     * @param question_deleted $event
+     * @return void
+     */
+    public static function delete_question_comments(question_deleted $event): void {
+        \comment::delete_comments([
+            'contextid' => \context_system::instance()->id,
+            'component' => 'qbank_comment',
+            'commentarea' => 'question',
+            'itemid' => $event->objectid,
+        ]);
+    }
+}

question/bank/comment/classes/output/renderer.php

@@ -0,0 +1,38 @@
+<?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/>.
+
+namespace qbank_comment\output;
+
+/**
+ * Class renderer for comment.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class renderer extends \plugin_renderer_base {
+
+    /**
+     * Render the html fragment for comment modal.
+     *
+     * @param array $displaydata
+     * @return string
+     */
+    public function render_comment_fragment($displaydata): string {
+        return $this->render_from_template('qbank_comment/comment_modal', $displaydata);
+    }
+}

question/bank/comment/classes/plugin_feature.php

@@ -0,0 +1,40 @@
+<?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/>.
+
+namespace qbank_comment;
+
+/**
+ * Class plugin_features is the entrypoint for the columns.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class plugin_feature extends \core_question\local\bank\plugin_features_base {
+
+    /**
+     * Get the columns provided by this plugin.
+     *
+     * @param \core_question\local\bank\view $qbank
+     * @return comment_count_column[]
+     */
+    public function get_question_columns(\core_question\local\bank\view $qbank): array {
+        return [
+            new comment_count_column($qbank)
+        ];
+    }
+}

question/bank/comment/classes/privacy/provider.php

@@ -0,0 +1,140 @@
+<?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/>.
+
+namespace qbank_comment\privacy;
+
+use core_privacy\local\metadata\collection;
+use core_privacy\local\request\approved_contextlist;
+use core_privacy\local\request\contextlist;
+use core_privacy\local\request\userlist;
+use core_privacy\local\request\approved_userlist;
+
+/**
+ * Privacy Subsystem for qbank_comment.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements
+        // The qbank_comment stores user provided data.
+        \core_privacy\local\metadata\provider,
+        \core_privacy\local\request\core_userlist_provider,
+        // The qbank_comment provides data directly to core.
+        \core_privacy\local\request\plugin\provider {
+
+    /**
+     * Returns meta data about this system.
+     *
+     * @param collection $collection
+     * @return collection
+     */
+    public static function get_metadata(collection $collection): collection {
+        return $collection->add_subsystem_link('core_comment', [], 'privacy:metadata:core_comment');
+    }
+
+    /**
+     * Get the list of contexts that contain user information for the specified user.
+     *
+     * @param int $userid
+     * @return contextlist
+     */
+    public static function get_contexts_for_userid(int $userid): contextlist {
+        $contextlist = new contextlist();
+
+        $sql = "SELECT contextid
+                  FROM {comments}
+                 WHERE component = :component
+                       AND userid = :userid";
+        $params = [
+                'area' => 'question',
+                'component' => 'qbank_comment',
+                'userid' => $userid
+        ];
+
+        $contextlist->add_from_sql($sql, $params);
+        return $contextlist;
+    }
+
+    /**
+     * Get the list of users within a specific 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();
+
+        $params = [
+                'contextid' => $context->id,
+                'area' => 'question',
+                'component' => 'qbank_comment'
+        ];
+
+        $sql = "SELECT userid as userid
+                  FROM {comments}
+                 WHERE component = :component
+                       AND 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
+     */
+    public static function export_user_data(approved_contextlist $contextlist) {
+        $contexts = $contextlist->get_contexts();
+        foreach ($contexts as $context) {
+            \core_comment\privacy\provider::export_comments(
+                    $context,
+                    'qbank_comment',
+                    'question',
+                    0,
+                    []
+            );
+        }
+    }
+
+    /**
+     * Delete all data for all users in the specified context.
+     *
+     * @param \context $context
+     */
+    public static function delete_data_for_all_users_in_context(\context $context) {
+        \core_comment\privacy\provider::delete_comments_for_all_users($context, 'qbank_comment');
+    }
+
+    /**
+     * 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 $userlist) {
+        \core_comment\privacy\provider::delete_comments_for_users($userlist, 'qbank_comment');
+    }
+
+    /**
+     * Delete all user data for the specified user, in the specified contexts.
+     *
+     * @param approved_contextlist $contextlist
+     */
+    public static function delete_data_for_user(approved_contextlist $contextlist) {
+        \core_comment\privacy\provider::delete_comments_for_user($contextlist, 'qbank_comment');
+    }
+
+}

question/bank/comment/db/access.php

@@ -0,0 +1,50 @@
+<?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/>.
+
+/**
+ * Capability definitions for this module.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Matt Porritt <mattp@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$capabilities = [
+        // Controls whether users can comment their own questions.
+        'moodle/question:commentmine' => [
+                'captype' => 'write',
+                'contextlevel' => CONTEXT_COURSE,
+                'archetypes' => [
+                        'editingteacher' => CAP_ALLOW,
+                        'manager' => CAP_ALLOW
+                ],
+                'clonepermissionsfrom' => 'moodle/question:editmine'
+        ],
+
+        // Controls whether users can comment all questions.
+        'moodle/question:commentall' => [
+                'captype' => 'write',
+                'contextlevel' => CONTEXT_COURSE,
+                'archetypes' => [
+                        'editingteacher' => CAP_ALLOW,
+                        'manager' => CAP_ALLOW
+                ],
+                'clonepermissionsfrom' => 'moodle/question:editall'
+        ],
+];

question/bank/comment/db/events.php

@@ -0,0 +1,33 @@
+<?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/>.
+
+/**
+ * Question custom fields events
+ *
+ * @package   qbank_comment
+ * @copyright 2023 onwards Catalyst IT EU {@link https://catalyst-eu.net}
+ * @author    Mark Johnson <mark.johnson@catalyst-eu.net>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$observers = [
+    [
+        'eventname' => '\core\event\question_deleted',
+        'callback' => '\qbank_comment\event\question_deleted_observer::delete_question_comments',
+    ]
+];

question/bank/comment/lang/en/qbank_comment.php

@@ -0,0 +1,40 @@
+<?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/>.
+
+/**
+ * Strings for component qbank_comment, language 'en'.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+$string['pluginname'] = 'Question comments';
+$string['privacy:metadata:core_comment'] = 'The Question comments question bank plugin enables users to comment on questions.';
+// Column.
+$string['comment'] = 'Comment';
+$string['commentplural'] = 'Comments';
+// Modal.
+$string['addcomment'] = 'Add comment';
+$string['close'] = 'Close';
+$string['commentheader'] = 'Question comments';
+$string['commentdisabled'] = 'Comments are currently disabled on this site. Please contact your site administrator.';
+// Events.
+$string['comment_added'] = 'The user with ID \'{$a->userid}\' added the comment with ID \'{$a->objectid}\'
+ to the \'{$a->component}\' for the question with ID \'{$a->itemid}\'.';
+$string['comment_removed'] = 'The user with ID \'{$a->userid}\' deleted the comment with ID \'{$a->objectid}\'
+ from the \'{$a->component}\' for the question with ID \'{$a->itemid}\'.';

question/bank/comment/lib.php

@@ -0,0 +1,142 @@
+<?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/>.
+
+/**
+ * Helper functions and callbacks.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+require_once($CFG->dirroot. '/comment/lib.php');
+
+/**
+ * Validate comment parameter before perform other comments actions.
+ *
+ * @param stdClass $commentparam
+ * {
+ * context     => context the context object
+ * courseid    => int course id
+ * cm          => stdClass course module object
+ * commentarea => string comment area
+ * itemid      => int itemid
+ * }
+ * @return boolean
+ */
+function qbank_comment_comment_validate($commentparam): bool {
+    if ($commentparam->commentarea != 'question' && $commentparam->component != 'qbank_comment') {
+        throw new comment_exception('invalidcommentarea');
+    }
+    return true;
+}
+
+/**
+ * Running additional permission check on plugins.
+ *
+ * @param stdClass $args
+ * @return array
+ */
+function qbank_comment_comment_permissions($args): array {
+    return ['post' => true, 'view' => true];
+}
+
+/**
+ * Validate comment data before displaying comments.
+ *
+ * @param array $comments
+ * @param stdClass $args
+ * @return array $comments
+ */
+function qbank_comment_comment_display($comments, $args): array {
+    if ($args->commentarea != 'question' && $args->component != 'qbank_comment') {
+        throw new comment_exception('core_question');
+    }
+    return $comments;
+}
+
+/**
+ * Comment content for callbacks.
+ *
+ * @param question_definition $question
+ * @param int $courseid
+ * @return string
+ */
+function qbank_comment_preview_display($question, $courseid): string {
+    global $CFG, $PAGE;
+    if (question_has_capability_on($question, 'comment') && $CFG->usecomments
+            && core\plugininfo\qbank::is_plugin_enabled('qbank_comment')) {
+        \comment::init($PAGE);
+        $args = new \stdClass;
+        $args->contextid = context_system::instance()->id; // Static data to bypass comment sql as context is not needed.
+        $args->courseid  = $courseid;
+        $args->area      = 'question';
+        $args->itemid    = $question->id;
+        $args->component = 'qbank_comment';
+        $args->notoggle  = true;
+        $args->autostart = true;
+        $args->displaycancel = false;
+        $args->linktext = get_string('commentheader', 'qbank_comment');
+        $comment = new \comment($args);
+        $comment->set_view_permission(true);
+        $comment->set_fullwidth();
+        return $comment->output();
+    } else {
+        return '';
+    }
+}
+
+/**
+ * Question comment fragment callback.
+ *
+ * @param array $args
+ * @return string rendered output
+ */
+function qbank_comment_output_fragment_question_comment($args): string {
+    global $USER, $PAGE, $CFG, $DB;
+    $displaydata = [];
+    require_once($CFG->dirroot . '/question/engine/bank.php');
+    $question = question_bank::load_question($args['questionid']);
+    $quba = question_engine::make_questions_usage_by_activity(
+            'core_question_preview', context_user::instance($USER->id));
+
+    // Just in case of any regression, it should not break the modal, just show the comments.
+    if (class_exists('\\qbank_previewquestion\\question_preview_options')) {
+        $options = new \qbank_previewquestion\question_preview_options($question);
+        $quba->set_preferred_behaviour($options->behaviour);
+        $slot = $quba->add_question($question, $options->maxmark);
+        $quba->start_question($slot, $options->variant);
+        $transaction = $DB->start_delegated_transaction();
+        question_engine::save_questions_usage_by_activity($quba);
+        $transaction->allow_commit();
+        $displaydata['question'] = $quba->render_question($slot, $options, '1');
+    }
+    $displaydata['comment'] = qbank_comment_preview_display($question, $args['courseid']);
+    $displaydata['commenstdisabled'] = false;
+    if (empty($displaydata['comment']) && !$CFG->usecomments) {
+        $displaydata['commenstdisabled'] = true;
+    }
+
+    $selector = \core_question\output\question_version_selection::make_for_question('question_comment_version_dropdown',
+        $args['questionid']);
+    $qbankrenderer = $PAGE->get_renderer('core_question', 'bank');
+    $displaydata['versionselection'] = $selector->export_for_template($qbankrenderer);
+
+    return $PAGE->get_renderer('qbank_comment')->render_comment_fragment($displaydata);
+}

question/bank/comment/styles.css

@@ -0,0 +1,5 @@
+/* Comment text area size to maximum */
+.question-comment-view .comment-ctrl .comment-area {
+    max-width: none;
+    width: 100%;
+}

question/bank/comment/templates/comment_modal.mustache

@@ -0,0 +1,49 @@
+{{!
+    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/>.
+}}
+{{!
+    @template qbank_comment/comment_modal
+
+    The template that renders the modal window for adding comments to questions.
+    * question - The html of the question.
+    * comment - The html of the comment.
+    * commenstdisabled - If true display the comment disabled notification.
+
+    Example context (json):
+    {
+        "commentdata": [
+            {
+                "question": "question html",
+                "comment": "comment html",
+                "commenstdisabled": "bool"
+            }
+        ]
+    }
+}}
+{{#versionselection}}
+    {{> core_question/question_version_selection }}
+{{/versionselection}}
+<div class="question-comment-preview">
+    {{{question}}}
+</div>
+<div class="question-comment-view">
+    {{{comment}}}
+    {{#commenstdisabled}}
+        <a class="alert-danger">
+            {{#str}} commentdisabled, qbank_comment {{/str}}
+        </a>
+    {{/commenstdisabled}}
+</div>

question/bank/comment/tests/backup_test.php

@@ -0,0 +1,216 @@
+<?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/>.
+
+namespace qbank_comment;
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+require_once($CFG->dirroot . '/backup/util/includes/backup_includes.php');
+require_once($CFG->dirroot . '/backup/util/includes/restore_includes.php');
+require_once($CFG->dirroot. '/comment/lib.php');
+
+/**
+ * Question comment backup and restore unit tests.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Matt Porritt <mattp@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class backup_test extends \advanced_testcase {
+
+    /**
+     * @var array Data object for generating a question.
+     */
+    protected $question1data;
+
+    /**
+     * @var array Data object for generating a question.
+     */
+    protected $question2data;
+
+    /**
+     * @var component_generator_base Question Generator.
+     */
+    protected $qgen;
+
+    /**
+     * @var core_course_category Course category.
+     */
+    protected $category;
+
+    /**
+     * @var stdClass Course object.
+     */
+    protected $course;
+
+    /**
+     * Set up
+     */
+    protected function setUp(): void {
+        parent::setUp();
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        // Set up custom fields.
+        $data = new \stdClass();
+        $data->component = 'qbank_comment';
+        $data->area = 'question';
+
+        // Question initial set up.
+        $this->category = $this->getDataGenerator()->create_category();
+        $this->course = $this->getDataGenerator()->create_course(['category' => $this->category->id]);
+        $context = \context_coursecat::instance($this->category->id);
+        $this->qgen = $this->getDataGenerator()->get_plugin_generator('core_question');
+        $qcat = $this->qgen->create_question_category(['contextid' => $context->id]);
+
+        $this->question1data = ['category' => $qcat->id, 'idnumber' => 'q1'];
+        $this->question2data = ['category' => $qcat->id, 'idnumber' => 'q2'];
+    }
+
+    /**
+     * Makes a backup of the course.
+     *
+     * @param \stdClass $course The course object.
+     * @return string Unique identifier for this backup.
+     */
+    protected function backup_course(\stdClass $course): string {
+        global $CFG, $USER;
+
+        // Turn off file logging, otherwise it can't delete the file (Windows).
+        $CFG->backup_file_logger_level = \backup::LOG_NONE;
+
+        // Do backup with default settings. MODE_IMPORT means it will just
+        // create the directory and not zip it.
+        $bc = new \backup_controller(\backup::TYPE_1COURSE, $course->id,
+                \backup::FORMAT_MOODLE, \backup::INTERACTIVE_NO, \backup::MODE_IMPORT,
+                $USER->id);
+        $backupid = $bc->get_backupid();
+        $bc->execute_plan();
+        $bc->destroy();
+
+        return $backupid;
+    }
+
+    /**
+     * Restores a backup that has been made earlier.
+     *
+     * @param string $backupid The unique identifier of the backup.
+     * @param string $fullname Full name of the new course that is going to be created.
+     * @param string $shortname Short name of the new course that is going to be created.
+     * @param int $categoryid The course category the backup is going to be restored in.
+     * @return int The new course id.
+     */
+    protected function restore_course(string $backupid, string $fullname, string $shortname, int $categoryid): int {
+        global $CFG, $USER;
+
+        // Turn off file logging, otherwise it can't delete the file (Windows).
+        $CFG->backup_file_logger_level = \backup::LOG_NONE;
+
+        // Do restore to new course with default settings.
+        $newcourseid = \restore_dbops::create_new_course($fullname, $shortname, $categoryid);
+        $rc = new \restore_controller($backupid, $newcourseid,
+                \backup::INTERACTIVE_NO, \backup::MODE_GENERAL, $USER->id,
+                \backup::TARGET_NEW_COURSE);
+
+        $rc->execute_precheck();
+        $rc->execute_plan();
+        $rc->destroy();
+
+        return $newcourseid;
+    }
+
+    /**
+     * Test comments attached to questions persist
+     * across the backup and restore process.
+     */
+    public function test_backup_restore(): void {
+        global $DB, $CFG;
+        require_once($CFG->dirroot . '/comment/lib.php');
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $courseshortname = $this->course->shortname;
+        $coursefullname = $this->course->fullname;
+
+        // Create 2 questions.
+        $question1 = $this->qgen->create_question('shortanswer', null, $this->question1data);
+        $question2 = $this->qgen->create_question('shortanswer', null, $this->question2data);
+
+        // Add comments to the questions.
+        $args = new \stdClass;
+        $args->context = \context_system::instance();
+        $args->course = $this->course;
+        $args->area = 'question';
+        $args->itemid = $question1->id;
+        $args->component = 'qbank_comment';
+        $args->linktext = get_string('commentheader', 'qbank_comment');
+        $args->notoggle = true;
+        $args->autostart = true;
+        $args->displaycancel = false;
+
+        // Two comments for question 1.
+        $commentobj1 = new \comment($args);
+        $commentobj1->add('new \comment for question 1 _ 1');
+        $comment1 = $commentobj1->add('new \comment for question 1 _ 2');
+
+        // One comment for question 2.
+        $args->itemid = $question2->id;
+        $commentobj2 = new \comment($args);
+        $comment2 = $commentobj2->add('new \comment for question 2');
+
+        // Create a quiz and the questions to that.
+        $quiz = $this->getDataGenerator()->create_module(
+                'quiz', ['course' => $this->course->id, 'name' => 'restored_quiz']);
+        quiz_add_quiz_question($question1->id, $quiz);
+        quiz_add_quiz_question($question2->id, $quiz);
+
+        // Backup the course.
+        $backupid = $this->backup_course($this->course);
+
+        // Now delete everything.
+        delete_course($this->course, false);
+        question_delete_question($question1->id);
+        question_delete_question($question2->id);
+
+        // Check the comment data for the questions has also gone.
+        $DB->record_exists('comments', ['id' => $comment1->id]);
+        $this->assertFalse($DB->record_exists('comments', ['id' => $comment1->id]));
+        $this->assertFalse($DB->record_exists('comments', ['id' => $comment2->id]));
+
+        // Restore the backup we had made earlier into a new course.
+        $newcategory = $this->getDataGenerator()->create_category();
+        $this->restore_course($backupid, $coursefullname, $courseshortname . '_2', $newcategory->id);
+
+        // The questions and their associated comments should have been restored.
+        $sql =
+            'SELECT q.*
+               FROM {question} q
+               JOIN {question_versions} qv ON qv.questionid = q.id
+               JOIN {question_bank_entries} qbe ON qbe.id = qv.questionbankentryid
+               WHERE qbe.idnumber = ?';
+        $newquestion1 = $DB->get_record_sql($sql, ['idnumber' => 'q1']);
+        $args->itemid = $newquestion1->id;
+        $commentobj = new \comment($args);
+        $this->assertEquals($commentobj->count(), 2);
+
+        $newquestion2 = $DB->get_record_sql($sql, ['idnumber' => 'q2']);
+        $args->itemid = $newquestion2->id;
+        $commentobj = new \comment($args);
+        $this->assertEquals($commentobj->count(), 1);
+    }
+}

question/bank/comment/tests/behat/behat_qbank_comment.php

@@ -0,0 +1,168 @@
+<?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/>.
+
+/**
+ * Commenting system steps definitions for question.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+// NOTE: no MOODLE_INTERNAL test here, this file may be required by behat before including /config.php.
+require_once(__DIR__ . '/../../../../../lib/behat/behat_base.php');
+require_once(__DIR__ . '/../../../../tests/behat/behat_question_base.php');
+
+use Behat\Mink\Exception\ExpectationException as ExpectationException,
+    Behat\Mink\Exception\ElementNotFoundException as ElementNotFoundException;
+
+/**
+ * Steps definitions to deal with the commenting system in question.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class behat_qbank_comment extends behat_question_base {
+
+    /**
+     * Looks for a table, then looks for a row that contains the given text.
+     * Once it finds the right row, it clicks a link in that row.
+     *
+     * @When I click :arg1 on the row on the comments column
+     * @param string $linkname
+     * @param string $rowtext
+     */
+    public function i_click_on_the_row_containing($linkname) {
+        $exception = new ElementNotFoundException($this->getSession(),
+                'Cannot find any row on the page containing the text ' . $linkname);
+        $row = $this->find('css', sprintf('table tbody tr td.commentcount a:contains("%s")', $linkname), $exception);
+        $row->click();
+    }
+
+    /**
+     * Looks for the appropriate comment count in the column.
+     *
+     * @Then I should see :arg1 on the comments column
+     * @param string $linkdata
+     */
+    public function i_should_see_on_the_column($linkdata) {
+        $exception = new ElementNotFoundException($this->getSession(),
+                'Cannot find any row with the comment count of ' . $linkdata . ' on the column named Comments');
+        $this->find('css', sprintf('table tbody tr td.commentcount a:contains("%s")', $linkdata), $exception);
+    }
+
+    /**
+     * Adds the specified option to the question comments of the current modal.
+     *
+     * @Then I add :arg1 comment to question
+     * @param string $comment
+     */
+    public function i_add_comment_to_question($comment) {
+
+        // Getting the textarea and setting the provided value.
+        $exception = new ElementNotFoundException($this->getSession(), 'Question ');
+
+        if ($this->running_javascript()) {
+            $commentstextarea = $this->find('css',
+                                        '.modal-dialog .question-comment-view .comment-area textarea', $exception);
+            $commentstextarea->setValue($comment);
+
+            // We delay 1 second which is all we need.
+            $this->getSession()->wait(1000);
+
+        } else {
+            throw new ExpectationException('JavaScript not running', $this->getSession());
+        }
+    }
+
+    /**
+     * Adds the specified option to the question comments of the question preview.
+     *
+     * @Then I add :arg1 comment to question preview
+     * @param string $comment
+     */
+    public function i_add_comment_to_question_preview($comment) {
+
+        // Getting the textarea and setting the provided value.
+        $exception = new ElementNotFoundException($this->getSession(), 'Question ');
+
+        if ($this->running_javascript()) {
+            $commentstextarea = $this->find('css',
+                    '.comment-area textarea', $exception);
+            $commentstextarea->setValue($comment);
+
+            // We delay 1 second which is all we need.
+            $this->getSession()->wait(1000);
+
+        } else {
+            throw new ExpectationException('JavaScript not running', $this->getSession());
+        }
+    }
+
+    /**
+     * Deletes the specified comment from the current question comment preview.
+     *
+     * @Then I delete :arg comment from question preview
+     * @param string $comment
+     */
+    public function i_delete_comment_from_question_preview($comment) {
+
+        $exception = new ElementNotFoundException($this->getSession(), '"' . $comment . '" comment ');
+
+        // Using xpath liternal to avoid possible problems with comments containing quotes.
+        $commentliteral = behat_context_helper::escape($comment);
+
+        $commentxpath = "//*[contains(concat(' ', normalize-space(@class), ' '), ' comment-ctrl ')]" .
+            "/descendant::div[@class='comment-message'][contains(., $commentliteral)]";
+
+        // Click on delete icon.
+        $this->execute('behat_general::i_click_on_in_the',
+            ["Delete comment posted by", "icon", $this->escape($commentxpath), "xpath_element"]
+        );
+
+        // Wait for the animation to finish, in theory is just 1 sec, adding 4 just in case.
+        $this->getSession()->wait(4 * 1000);
+    }
+
+    /**
+     * Deletes the specified comment from the current question comment modal.
+     *
+     * @Then I delete :arg comment from question
+     * @param string $comment
+     */
+    public function i_delete_comment_from_question($comment) {
+
+        $exception = new ElementNotFoundException($this->getSession(), '"' . $comment . '" comment ');
+
+        // Using xpath liternal to avoid possible problems with comments containing quotes.
+        $commentliteral = behat_context_helper::escape($comment);
+
+        $commentxpath = "//*[contains(concat(' ', normalize-space(@class), ' '), ' question-comment-view ')]" .
+                "/descendant::div[@class='comment-message'][contains(., $commentliteral)]";
+
+        // Click on delete icon.
+        $this->execute('behat_general::i_click_on_in_the',
+                ["Delete comment posted by", "icon", $this->escape($commentxpath), "xpath_element"]
+        );
+
+        // Wait for the animation to finish, in theory is just 1 sec, adding 4 just in case.
+        $this->getSession()->wait(4 * 1000);
+    }
+
+}

question/bank/comment/tests/behat/question_comment.feature

@@ -0,0 +1,151 @@
+@qbank @qbank_comment @javascript
+Feature: A Teacher can comment in a question
+
+  Background:
+    Given the following "users" exist:
+      | username | firstname | lastname | email                |
+      | teacher1 | T1        | Teacher1 | teacher1@example.com |
+      | teacher2 | T2        | Teacher2 | teacher2@example.com |
+    And the following "courses" exist:
+      | fullname | shortname | category |
+      | Course 1 | C1        | 0        |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | teacher1 | C1     | editingteacher |
+      | teacher2 | C1     | editingteacher |
+    And the following "activities" exist:
+      | activity | name      | course | idnumber |
+      | quiz     | Test quiz | C1     | quiz1    |
+    And the following "question categories" exist:
+      | contextlevel | reference | name           |
+      | Course       | C1        | Test questions |
+    And the following "questions" exist:
+      | questioncategory | qtype     | name           | questiontext              |
+      | Test questions   | truefalse | First question | Answer the first question |
+
+  @javascript
+  Scenario: Add a comment in question
+    Given I am on the "Test quiz" "mod_quiz > question bank" page logged in as "teacher1"
+    And I apply question bank filter "Category" with value "Test questions"
+    And I should see "0" on the comments column
+    When I click "0" on the row on the comments column
+    And I add "Super test comment 01" comment to question
+    And I click on "Add comment" "button" in the ".modal-dialog" "css_element"
+    And I should see "Super test comment 01"
+    And I click on "Close" "button" in the ".modal-dialog" "css_element"
+    Then I should see "1" on the comments column
+
+  @javascript
+  Scenario: Delete a comment from question
+    Given I am on the "Test quiz" "mod_quiz > question bank" page logged in as "teacher1"
+    And I apply question bank filter "Category" with value "Test questions"
+    And I should see "0" on the comments column
+    When I click "0" on the row on the comments column
+    And I add "Super test comment 01 to be deleted" comment to question
+    And I click on "Add comment" "button" in the ".modal-dialog" "css_element"
+    And I should see "Super test comment 01 to be deleted"
+    And I click on "Close" "button" in the ".modal-dialog" "css_element"
+    Then I should see "1" on the comments column
+    And I click "1" on the row on the comments column
+    And I delete "Super test comment 01 to be deleted" comment from question
+    And I should not see "Super test comment 01 to be deleted"
+    And I click on "Close" "button" in the ".modal-dialog" "css_element"
+    But I should see "0" on the comments column
+
+  @javascript
+  Scenario: Preview question with comments
+    Given I am on the "Test quiz" "mod_quiz > question bank" page logged in as "teacher1"
+    And I apply question bank filter "Category" with value "Test questions"
+    And I choose "Preview" action for "First question" in the question bank
+    And I click on "Comments" "link"
+    Then I should see "Save comment"
+    And I add "Super test comment 01" comment to question preview
+    And I click on "Save comment" "link"
+    And I wait "1" seconds
+    Then I should see "Super test comment 01"
+    And I click on "Close preview" "button"
+    Then I should see "1" on the comments column
+    And I choose "Preview" action for "First question" in the question bank
+    And I click on "Comments" "link"
+    And I delete "Super test comment 01" comment from question preview
+    And I should not see "Super test comment 01"
+    And I click on "Close preview" "button"
+    Then I should see "0" on the comments column
+
+  @javascript
+  Scenario: Teacher with comment permissions for their own questions but not others questions
+    Given the following "role capability" exists:
+      | role                        | editingteacher |
+      | moodle/question:commentmine | allow          |
+      | moodle/question:commentall  | prevent        |
+    And I am on the "Test quiz" "mod_quiz > question bank" page logged in as "teacher1"
+    And I apply question bank filter "Category" with value "Test questions"
+    And I choose "Preview" action for "First question" in the question bank
+    Then I should not see "Save comment"
+    And I click on "Close preview" "button"
+    Then I click on "Create a new question ..." "button"
+    And I set the field "item_qtype_essay" to "1"
+    And I press "submitbutton"
+    Then I should see "Adding an Essay question"
+    And I set the field "Question name" to "Essay 01 new"
+    And I set the field "Question text" to "Please write 200 words about Essay 01"
+    And I press "id_submitbutton"
+    Then I should see "Essay 01 new"
+    And I choose "Preview" action for "Essay 01 new" in the question bank
+    And I click on "Comments" "link"
+    Then I should see "Save comment"
+    And I log out
+    And I am on the "Test quiz" "mod_quiz > question bank" page logged in as "teacher2"
+    And I apply question bank filter "Category" with value "Test questions"
+    And I choose "Preview" action for "First question" in the question bank
+    Then I should not see "Save comment"
+    And I click on "Close preview" "button"
+    And I choose "Preview" action for "Essay 01 new" in the question bank
+    Then I should not see "Save comment"
+    And I click on "Close preview" "button"
+
+  @javascript
+  Scenario: Comments added from the quiz page are visible
+    Given I am on the "Test quiz" "mod_quiz > edit" page logged in as "teacher1"
+    And I press "Add"
+    And I follow "from question bank"
+    And I click on "Select" "checkbox" in the "First question" "table_row"
+    And I click on "Add selected questions to the quiz" "button"
+    And I click on "Preview question" "link"
+    And I switch to "questionpreview" window
+    And I press "Comments"
+    And I set the field "content" to "Some new comment"
+    And I click on "Save comment" "link"
+    And I should see "Some new comment"
+    And I switch to the main window
+    And I am on the "Test quiz" "mod_quiz > question bank" page
+    And I choose "Preview" action for "First question" in the question bank
+    And I click on "Comments" "link"
+    And I should see "Some new comment"
+    And I should see "T1 Teacher1"
+    And I delete "Some new comment" comment from question preview
+    And I should not see "Some new comment"
+    And I am on the "Test quiz" "mod_quiz > edit" page
+    And I click on "Preview question" "link"
+    And I switch to "questionpreview" window
+    And I press "Comments"
+    Then I should not see "Some new comment"
+
+  @javascript
+  Scenario: Comments modal can change the version using dropdown
+    Given I log in as "teacher1"
+    And I am on the "Test quiz" "quiz activity" page
+    When I navigate to "Question bank" in current page administration
+    And I should see "First question"
+    And I choose "Edit question" action for "First question" in the question bank
+    And I set the field "id_name" to "Renamed question v2"
+    And I set the field "id_questiontext" to "edited question"
+    And I press "id_submitbutton"
+    And I should not see "First question"
+    And I should see "Renamed question v2"
+    And I click "0" on the row on the comments column
+    And I should see "Version 2"
+    Then I should see "edited question"
+    And I should see "Version 1"
+    And I set the field "question_version_dropdown" to "Version 1"
+    And I should see "Answer the first question"

question/bank/comment/tests/behat/question_comment_column.feature

@@ -0,0 +1,30 @@
+@qbank @qbank_comment
+Feature: Use the qbank plugin manager page for comment
+  In order to check the plugin behaviour with enable and disable
+
+  Background:
+    Given the following "courses" exist:
+      | fullname | shortname | category |
+      | Course 1 | C1        | 0        |
+    And the following "activities" exist:
+      | activity   | name      | course | idnumber |
+      | quiz       | Test quiz | C1     | quiz1    |
+    And the following "question categories" exist:
+      | contextlevel | reference | name           |
+      | Course         | C1     | Test questions |
+    And the following "questions" exist:
+      | questioncategory | qtype     | name           | questiontext              |
+      | Test questions   | truefalse | First question | Answer the first question |
+
+  @javascript
+  Scenario: Enable/disable comment column from the base view
+    Given I log in as "admin"
+    When I navigate to "Plugins > Question bank plugins > Manage question bank plugins" in site administration
+    And I should see "Question comments"
+    And I click on "Disable" "link" in the "Question comments" "table_row"
+    And I am on the "Test quiz" "mod_quiz > question bank" page
+    Then "#categoryquestions .header.commentcount" "css_element" should not be visible
+    And I navigate to "Plugins > Question bank plugins > Manage question bank plugins" in site administration
+    And I click on "Enable" "link" in the "Question comments" "table_row"
+    And I am on the "Test quiz" "mod_quiz > question bank" page
+    And "#categoryquestions .header.commentcount" "css_element" should be visible

question/bank/comment/tests/event/comment_created_deleted_test.php

@@ -0,0 +1,127 @@
+<?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/>.
+
+namespace qbank_comment\event;
+
+use advanced_testcase;
+use cache;
+use comment;
+use context;
+use context_course;
+use core_question_generator;
+use stdClass;
+
+/**
+ * Event tests for question comments.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class comment_created_deleted_test extends advanced_testcase {
+
+    /** @var stdClass Keeps course object */
+    private $course;
+
+    /** @var context Keeps context */
+    private $context;
+
+    /** @var stdClass Keeps question object */
+    private $questiondata;
+
+    /** @var stdClass Keeps comment object */
+    private $comment;
+
+    /**
+     * Setup test data.
+     */
+    public function setUp(): void {
+        global $CFG;
+        require_once($CFG->dirroot . '/comment/lib.php');
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+        $generator = $this->getDataGenerator();
+
+        /** @var core_question_generator $questiongenerator */
+        $questiongenerator = $generator->get_plugin_generator('core_question');
+
+        // Create a course.
+        $this->course = $generator->create_course();
+        $this->context = context_course::instance($this->course->id);
+
+        // Create a question in the default category.
+        $contexts = new \core_question\local\bank\question_edit_contexts($this->context);
+        $cat = question_make_default_categories($contexts->all());
+        $this->questiondata = $questiongenerator->create_question('numerical', null,
+                ['name' => 'Example question', 'category' => $cat->id]);
+
+        // Ensure the question is not in the cache.
+        $cache = cache::make('core', 'questiondata');
+        $cache->delete($this->questiondata->id);
+
+        // Comment on question.
+        $args = new stdClass;
+        $args->context = $this->context;
+        $args->course = $this->course;
+        $args->area = 'question';
+        $args->itemid = $this->questiondata->id;
+        $args->component = 'qbank_comment';
+        $args->linktext = get_string('commentheader', 'qbank_comment');
+        $args->notoggle = true;
+        $args->autostart = true;
+        $args->displaycancel = false;
+        $this->comment = new comment($args);
+    }
+
+    /**
+     * Test comment_created event.
+     */
+    public function test_comment_created(): void {
+        // Triggering and capturing the event.
+        $sink = $this->redirectEvents();
+        $this->comment->add('New comment');
+        $events = $sink->get_events();
+        $this->assertCount(1, $events);
+        $event = reset($events);
+
+        // Checking that the event contains the expected values.
+        $this->assertInstanceOf('\qbank_comment\event\comment_created', $event);
+        $this->assertEquals($this->context, $event->get_context());
+        $this->assertStringContainsString('\'qbank_comment\' for the question with ID \''.$this->questiondata->id.'\'',
+                $event->get_description());
+    }
+
+    /**
+     * Test comment_created event.
+     */
+    public function test_comment_deleted(): void {
+        // Triggering and capturing the event.
+        $newcomment = $this->comment->add('New comment to delete');
+        $sink = $this->redirectEvents();
+        $this->comment->delete($newcomment->id);
+        $events = $sink->get_events();
+        $this->assertCount(1, $events);
+        $event = reset($events);
+
+        // Checking that the event contains the expected values.
+        $this->assertInstanceOf('\qbank_comment\event\comment_deleted', $event);
+        $this->assertEquals($this->context, $event->get_context());
+        $this->assertStringContainsString('\'qbank_comment\' for the question with ID \''.$this->questiondata->id.'\'',
+                $event->get_description());
+    }
+}

question/bank/comment/tests/event/question_deleted_observer_test.php

@@ -0,0 +1,66 @@
+<?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/>.
+
+namespace qbank_comment\event;
+
+/**
+ * Tests for question_deleted_observer
+ *
+ * @package   qbank_comment
+ * @copyright 2023 onwards Catalyst IT EU {@link https://catalyst-eu.net}
+ * @author    Mark Johnson <mark.johnson@catalyst-eu.net>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @covers    \qbank_comment\event\question_deleted_observer
+ */
+class question_deleted_observer_test extends \advanced_testcase {
+
+    /**
+     * Deleting a question with comments should also delete the comments
+     *
+     * @return void
+     */
+    public function test_delete_question_with_comments(): void {
+        $this->resetAfterTest();
+        $this->setAdminUser();
+        $questiongenerator = $this->getDataGenerator()->get_plugin_generator('core_question');
+        [, , , $questions] = $questiongenerator->setup_course_and_questions();
+        $question = reset($questions);
+
+        $context = \context_system::instance();
+        $commentgenerator = $this->getDataGenerator()->get_plugin_generator('core_comment');
+        /** @var \comment $comment */
+        $comment = $commentgenerator->create_comment([
+            'context' => $context,
+            'component' => 'qbank_comment',
+            'area' => 'question',
+            'itemid' => $question->id,
+            'content' => random_string(),
+        ]);
+
+        $this->assertEquals(1, $comment->count());
+
+        question_delete_question($question->id);
+
+        $newcomment = new \comment((object)[
+            'context' => $context,
+            'component' => 'qbank_comment',
+            'area' => 'question',
+            'itemid' => $question->id,
+        ]);
+
+        $this->assertEquals(0, $newcomment->count());
+    }
+}

question/bank/comment/tests/lib_test.php

@@ -0,0 +1,128 @@
+<?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/>.
+
+namespace qbank_comment;
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+require_once($CFG->dirroot . '/question/bank/comment/lib.php');
+
+
+/**
+ * Comment lib unit tests.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Matt Porritt <mattp@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class lib_test extends \advanced_testcase {
+
+    /**
+     * Test the comment validation callback.
+     */
+    public function test_qbank_comment_comment_validate(): void {
+        $commentparams = new \stdClass();
+        $commentparams->commentarea = 'question';
+        $commentparams->component = 'qbank_comment';
+
+        $isvalid = qbank_comment_comment_validate($commentparams);
+        $this->assertTrue($isvalid);
+
+        $this->expectException('comment_exception');
+        $commentparams->commentarea = 'core_comment';
+        $commentparams->component = 'blog_comment';
+        qbank_comment_comment_validate($commentparams);
+
+    }
+
+    /**
+     * Test the comment display callback.
+     */
+    public function test_qbank_comment_comment_display(): void {
+        $comment = new \stdClass();
+        $comment->text = 'test';
+        $comments = [$comment];
+
+        $commentparams = new \stdClass();
+        $commentparams->commentarea = 'question';
+        $commentparams->component = 'qbank_comment';
+
+        $responses = qbank_comment_comment_display($comments, $commentparams);
+        $this->assertEquals($comment->text, $responses[0]->text);
+
+        $this->expectException('comment_exception');
+        $commentparams->commentarea = 'core_comment';
+        $commentparams->component = 'blog_comment';
+        qbank_comment_comment_display($comments, $commentparams);
+
+    }
+
+    /**
+     * Test the comment preview callback.
+     */
+    public function test_qbank_comment_preview_display(): void {
+        $this->resetAfterTest();
+        global $PAGE;
+        $PAGE->set_url('/');
+
+        // Make a test question.
+        $category = $this->getDataGenerator()->create_category();
+        $course = $this->getDataGenerator()->create_course(['category' => $category->id]);
+        $qgen = $this->getDataGenerator()->get_plugin_generator('core_question');
+        $context = \context_coursecat::instance($category->id);
+        $qcat = $qgen->create_question_category(['contextid' => $context->id]);
+        $question = $qgen->create_question('shortanswer', null, ['category' => $qcat->id, 'idnumber' => 'q1']);
+
+        $result = qbank_comment_preview_display($question, $course->id);
+
+        // User doesn't have perms so expecting no output.
+        $this->assertEmpty($result);
+
+        // Expect output.
+        $this->setAdminUser();
+        $result = qbank_comment_preview_display($question, $course->id);
+        $this->assertStringContainsString('comment-action-post', $result);
+    }
+
+    /**
+     * Test the comment preview callback.
+     */
+    public function test_qbank_comment_output_fragment_question_comment(): void {
+        $this->resetAfterTest();
+        $this->setAdminUser();
+        global $PAGE;
+        $PAGE->set_url('/');
+
+        // Make a test question.
+        $category = $this->getDataGenerator()->create_category();
+        $course = $this->getDataGenerator()->create_course(['category' => $category->id]);
+        $qgen = $this->getDataGenerator()->get_plugin_generator('core_question');
+        $context = \context_coursecat::instance($category->id);
+        $qcat = $qgen->create_question_category(['contextid' => $context->id]);
+        $question = $qgen->create_question('shortanswer', null, ['category' => $qcat->id, 'idnumber' => 'q1']);
+        $args = [
+            'questionid' => $question->id,
+            'courseid' => $course->id,
+            ];
+
+        $result = qbank_comment_output_fragment_question_comment($args);
+
+        // Expect output.
+        $this->assertStringContainsString('comment-action-post', $result);
+    }
+}

question/bank/comment/tests/privacy/provider_test.php

@@ -0,0 +1,358 @@
+<?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/>.
+
+namespace qbank_comment\privacy;
+
+use comment;
+use context;
+use context_course;
+use core_privacy\local\metadata\collection;
+use qbank_comment\privacy\provider;
+use core_privacy\local\request\approved_userlist;
+use stdClass;
+
+/**
+ * Privacy api tests.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider_test extends \core_privacy\tests\provider_testcase {
+
+    /** @var stdClass A teacher who is only enrolled in course1. */
+    protected $teacher1;
+
+    /** @var stdClass A teacher who is only enrolled in course2. */
+    protected $teacher2;
+
+    /** @var stdClass A teacher who is enrolled in both course1 and course2. */
+    protected $teacher3;
+
+    /** @var stdClass A test course. */
+    protected $course1;
+
+    /** @var stdClass A test course. */
+    protected $course2;
+
+    /**
+     * Set up function for tests in this class.
+     */
+    protected function setUp(): void {
+        global $DB;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        // Create courses.
+        $generator = $this->getDataGenerator();
+        $this->course1 = $generator->create_course();
+        $this->course2 = $generator->create_course();
+
+        // Create and enrol teachers.
+        $this->teacher1 = $generator->create_user();
+        $this->teacher2 = $generator->create_user();
+        $this->teacher3 = $generator->create_user();
+
+        $studentrole = $DB->get_record('role', ['shortname' => 'editingteacher']);
+        $generator->enrol_user($this->teacher1->id,  $this->course1->id, $studentrole->id);
+        $generator->enrol_user($this->teacher2->id,  $this->course2->id, $studentrole->id);
+        $generator->enrol_user($this->teacher3->id,  $this->course1->id, $studentrole->id);
+        $generator->enrol_user($this->teacher3->id,  $this->course2->id, $studentrole->id);
+    }
+
+    /**
+     * Posts a comment on a given context.
+     *
+     * @param string $text The comment's text.
+     * @param context $context The context on which we want to put the comment.
+     */
+    protected function add_comment($text, context $context) {
+        $args = new stdClass;
+        $args->context = $context;
+        $args->area = 'question';
+        $args->itemid = 0;
+        $args->component = 'qbank_comment';
+        $args->linktext = get_string('commentheader', 'qbank_comment');
+        $args->notoggle = true;
+        $args->autostart = true;
+        $args->displaycancel = false;
+        $comment = new comment($args);
+
+        $comment->add($text);
+    }
+
+    /**
+     * Test for provider::get_metadata().
+     */
+    public function test_get_metadata(): void {
+        $collection = new collection('qbank_comment');
+        $newcollection = provider::get_metadata($collection);
+        $itemcollection = $newcollection->get_collection();
+        $this->assertCount(1, $itemcollection);
+
+        $link = reset($itemcollection);
+
+        $this->assertEquals('core_comment', $link->get_name());
+        $this->assertEmpty($link->get_privacy_fields());
+        $this->assertEquals('privacy:metadata:core_comment', $link->get_summary());
+    }
+
+    /**
+     * Test for provider::get_contexts_for_userid() when user had not posted any comments..
+     */
+    public function test_get_contexts_for_userid_no_comment(): void {
+        $this->setUser($this->teacher1);
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $this->add_comment('New comment', $coursecontext1);
+
+        $this->setUser($this->teacher2);
+        $contextlist = provider::get_contexts_for_userid($this->teacher2->id);
+        $this->assertCount(0, $contextlist);
+    }
+
+    /**
+     * Test for provider::get_contexts_for_userid().
+     */
+    public function test_get_contexts_for_userid(): void {
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $coursecontext2 = context_course::instance($this->course2->id);
+
+        $this->setUser($this->teacher3);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext2);
+
+        $contextlist = provider::get_contexts_for_userid($this->teacher3->id);
+        $this->assertCount(2, $contextlist);
+
+        $contextids = $contextlist->get_contextids();
+        $this->assertEqualsCanonicalizing([$coursecontext1->id, $coursecontext2->id], $contextids);
+    }
+
+    /**
+     * Test for provider::export_user_data() when the user has not posted any comments.
+     */
+    public function test_export_for_context_no_comment(): void {
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $coursecontext2 = context_course::instance($this->course2->id);
+
+        $this->setUser($this->teacher1);
+        $this->add_comment('New comment', $coursecontext1);
+
+        $this->setUser($this->teacher2);
+
+        $this->setUser($this->teacher2);
+        $this->export_context_data_for_user($this->teacher1->id, $coursecontext2, 'qbank_comment');
+        $writer = \core_privacy\local\request\writer::with_context($coursecontext2);
+        $this->assertFalse($writer->has_any_data());
+    }
+
+    /**
+     * Test for provider::export_user_data().
+     */
+    public function test_export_for_context(): void {
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $coursecontext2 = context_course::instance($this->course2->id);
+
+        $this->setUser($this->teacher3);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext2);
+
+        // Export all of the data for the context.
+        $this->export_context_data_for_user($this->teacher3->id, $coursecontext1, 'qbank_comment');
+        $writer = \core_privacy\local\request\writer::with_context($coursecontext1);
+        $this->assertTrue($writer->has_any_data());
+    }
+
+    /**
+     * Test for provider::delete_data_for_all_users_in_context().
+     */
+    public function test_delete_data_for_all_users_in_context(): void {
+        global $DB;
+
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $coursecontext2 = context_course::instance($this->course2->id);
+
+        $this->setUser($this->teacher1);
+        $this->add_comment('New comment', $coursecontext1);
+
+        $this->setUser($this->teacher2);
+        $this->add_comment('New comment', $coursecontext2);
+
+        $this->setUser($this->teacher3);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext2);
+
+        // Before deletion, we should have 3 comments in $coursecontext1 and 2 comments in $coursecontext2.
+        $this->assertEquals(
+                3,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext1->id])
+        );
+        $this->assertEquals(
+                2,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext2->id])
+        );
+
+        // Delete data based on context.
+        provider::delete_data_for_all_users_in_context($coursecontext1);
+
+        // After deletion, the comments for $coursecontext1 should have been deleted.
+        $this->assertEquals(
+                0,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext1->id])
+        );
+        $this->assertEquals(
+                2,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext2->id])
+        );
+    }
+
+    /**
+     * Test for provider::delete_data_for_user().
+     */
+    public function test_delete_data_for_user(): void {
+        global $DB;
+
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $coursecontext2 = context_course::instance($this->course2->id);
+
+        $this->setUser($this->teacher1);
+        $this->add_comment('New comment', $coursecontext1);
+
+        $this->setUser($this->teacher2);
+        $this->add_comment('New comment', $coursecontext2);
+
+        $this->setUser($this->teacher3);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext2);
+
+        // Before deletion, we should have 3 comments in $coursecontext1 and 2 comments in $coursecontext2,
+        // and 3 comments by student12 in $coursecontext1 and $coursecontext2 combined.
+        $this->assertEquals(
+                3,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext1->id])
+        );
+        $this->assertEquals(
+                2,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext2->id])
+        );
+        $this->assertEquals(
+                3,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'userid' => $this->teacher3->id])
+        );
+
+        $contextlist = new \core_privacy\local\request\approved_contextlist($this->teacher3, 'qbank_comment',
+                [$coursecontext1->id, $coursecontext2->id]);
+        provider::delete_data_for_user($contextlist);
+
+        // After deletion, the comments for the student12 should have been deleted.
+        $this->assertEquals(
+                1,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext1->id])
+        );
+        $this->assertEquals(
+                1,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'contextid' => $coursecontext2->id])
+        );
+        $this->assertEquals(
+                0,
+                $DB->count_records('comments', ['component' => 'qbank_comment', 'userid' => $this->teacher3->id])
+        );
+    }
+
+    /**
+     * Test that only users within a course context are fetched.
+     */
+    public function test_get_users_in_context(): void {
+        $component = 'qbank_comment';
+
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $coursecontext2 = context_course::instance($this->course2->id);
+
+        $userlist1 = new \core_privacy\local\request\userlist($coursecontext1, $component);
+        provider::get_users_in_context($userlist1);
+        $this->assertCount(0, $userlist1);
+
+        $userlist2 = new \core_privacy\local\request\userlist($coursecontext2, $component);
+        provider::get_users_in_context($userlist2);
+        $this->assertCount(0, $userlist2);
+
+        $this->setUser($this->teacher3);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext2);
+        $this->setUser($this->teacher1);
+        $this->add_comment('New comment', $coursecontext1);
+
+        // The list of users should contain teacher3 and user1.
+        provider::get_users_in_context($userlist1);
+        $this->assertCount(2, $userlist1);
+        $this->assertTrue(in_array($this->teacher1->id, $userlist1->get_userids()));
+        $this->assertTrue(in_array($this->teacher3->id, $userlist1->get_userids()));
+
+        // The list of users should contain teacher3.
+        provider::get_users_in_context($userlist2);
+        $this->assertCount(1, $userlist2);
+        $expected = [$this->teacher3->id];
+        $actual = $userlist2->get_userids();
+        $this->assertEquals($expected, $actual);
+    }
+
+    /**
+     * Test that data for users in approved userlist is deleted.
+     */
+    public function test_delete_data_for_users(): void {
+        $component = 'qbank_comment';
+
+        $coursecontext1 = context_course::instance($this->course1->id);
+        $coursecontext2 = context_course::instance($this->course2->id);
+
+        $this->setUser($this->teacher3);
+        $this->add_comment('New comment', $coursecontext1);
+        $this->add_comment('New comment', $coursecontext2);
+        $this->setUser($this->teacher1);
+        $this->add_comment('New comment', $coursecontext1);
+
+        $userlist1 = new \core_privacy\local\request\userlist($coursecontext1, $component);
+        provider::get_users_in_context($userlist1);
+        $this->assertCount(2, $userlist1);
+
+        $userlist2 = new \core_privacy\local\request\userlist($coursecontext2, $component);
+        provider::get_users_in_context($userlist2);
+        $this->assertCount(1, $userlist2);
+
+        // Convert $userlist1 into an approved_contextlist.
+        $approvedlist1 = new approved_userlist($coursecontext1, $component, $userlist1->get_userids());
+        // Delete using delete_data_for_user.
+        provider::delete_data_for_users($approvedlist1);
+
+        // Re-fetch users in coursecontext1.
+        $userlist1 = new \core_privacy\local\request\userlist($coursecontext1, $component);
+        provider::get_users_in_context($userlist1);
+        // The user data in coursecontext1 should be deleted.
+        $this->assertCount(0, $userlist1);
+
+        // Re-fetch users in coursecontext2.
+        $userlist2 = new \core_privacy\local\request\userlist($coursecontext2, $component);
+        provider::get_users_in_context($userlist2);
+        // The user data in coursecontext2 should be still present.
+        $this->assertCount(1, $userlist2);
+    }
+}

question/bank/comment/version.php

@@ -0,0 +1,31 @@
+<?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/>.
+
+/**
+ * Version information for qbank_comment.
+ *
+ * @package    qbank_comment
+ * @copyright  2021 Catalyst IT Australia Pty Ltd
+ * @author     Safat Shahin <safatshahin@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$plugin->component = 'qbank_comment';
+$plugin->version   = 2024042200;
+$plugin->requires  = 2024041600;
+$plugin->maturity  = MATURITY_STABLE;