Merge branch 'MDL-61970-master' of git://github.com/FMCorz/moodle
authorAndrew Nicols <andrew@nicols.co.uk>
Thu, 19 Apr 2018 03:12:35 +0000 (11:12 +0800)
committerAndrew Nicols <andrew@nicols.co.uk>
Thu, 19 Apr 2018 03:12:35 +0000 (11:12 +0800)
mod/survey/classes/privacy/provider.php [new file with mode: 0644]
mod/survey/lang/en/survey.php
mod/survey/tests/privacy_test.php [new file with mode: 0644]

diff --git a/mod/survey/classes/privacy/provider.php b/mod/survey/classes/privacy/provider.php
new file mode 100644 (file)
index 0000000..ac541f7
--- /dev/null
@@ -0,0 +1,317 @@
+<?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/>.
+
+/**
+ * Data provider.
+ *
+ * @package    mod_survey
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace mod_survey\privacy;
+defined('MOODLE_INTERNAL') || die();
+
+use context;
+use context_helper;
+use context_module;
+use core_privacy\local\metadata\collection;
+use core_privacy\local\request\approved_contextlist;
+use core_privacy\local\request\helper;
+use core_privacy\local\request\transform;
+use core_privacy\local\request\writer;
+
+require_once($CFG->dirroot . '/mod/survey/lib.php');
+
+/**
+ * Data provider class.
+ *
+ * @package    mod_survey
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements
+    \core_privacy\local\metadata\provider,
+    \core_privacy\local\request\plugin\provider {
+
+    /**
+     * Returns metadata.
+     *
+     * @param collection $collection The initialised collection to add items to.
+     * @return collection A listing of user data stored through this system.
+     */
+    public static function get_metadata(collection $collection) : collection {
+        $collection->add_database_table('survey_answers', [
+            'userid' => 'privacy:metadata:answers:userid',
+            'question' => 'privacy:metadata:answers:question',
+            'answer1' => 'privacy:metadata:answers:answer1',
+            'answer2' => 'privacy:metadata:answers:answer2',
+            'time' => 'privacy:metadata:answers:time',
+        ], 'privacy:metadata:answers');
+
+        $collection->add_database_table('survey_analysis', [
+            'userid' => 'privacy:metadata:analysis:userid',
+            'notes' => 'privacy:metadata:analysis:notes',
+        ], 'privacy:metadata:analysis');
+
+        return $collection;
+    }
+
+    /**
+     * Get the list of contexts that contain user information for the specified user.
+     *
+     * @param int $userid The user to search.
+     * @return contextlist $contextlist The contextlist containing the list of contexts used in this plugin.
+     */
+    public static function get_contexts_for_userid(int $userid) : \core_privacy\local\request\contextlist {
+        $contextlist = new \core_privacy\local\request\contextlist();
+
+        // While we should not have an analysis without answers, it's safer to gather contexts by looking at both tables.
+        $sql = "
+            SELECT DISTINCT ctx.id
+              FROM {survey} s
+              JOIN {modules} m
+                ON m.name = :survey
+              JOIN {course_modules} cm
+                ON cm.instance = s.id
+               AND cm.module = m.id
+              JOIN {context} ctx
+                ON ctx.instanceid = cm.id
+               AND ctx.contextlevel = :modulelevel
+         LEFT JOIN {survey_answers} sa
+                ON sa.survey = s.id
+               AND sa.userid = :userid1
+         LEFT JOIN {survey_analysis} sy
+                ON sy.survey = s.id
+               AND sy.userid = :userid2
+             WHERE s.template <> 0
+               AND (sa.id IS NOT NULL
+                OR sy.id IS NOT NULL)";
+
+        $contextlist->add_from_sql($sql, [
+            'survey' => 'survey',
+            'modulelevel' => CONTEXT_MODULE,
+            'userid1' => $userid,
+            'userid2' => $userid,
+        ]);
+
+        return $contextlist;
+    }
+
+    /**
+     * Export all user data for the specified user, in the specified contexts.
+     *
+     * @param approved_contextlist $contextlist The approved contexts to export information for.
+     */
+    public static function export_user_data(approved_contextlist $contextlist) {
+        global $DB;
+
+        $user = $contextlist->get_user();
+        $userid = $user->id;
+        $cmids = array_reduce($contextlist->get_contexts(), function($carry, $context) {
+            if ($context->contextlevel == CONTEXT_MODULE) {
+                $carry[] = $context->instanceid;
+            }
+            return $carry;
+        }, []);
+
+        if (empty($cmids)) {
+            return;
+        }
+
+        // Export the answers.
+        list($insql, $inparams) = $DB->get_in_or_equal($cmids, SQL_PARAMS_NAMED);
+        $sql = "
+            SELECT sa.*,
+                   sq.id as qid,
+                   sq.text as qtext,
+                   sq.shorttext as qshorttext,
+                   sq.intro as qintro,
+                   sq.options as qoptions,
+                   sq.type as qtype,
+                   cm.id as cmid
+              FROM {survey_answers} sa
+              JOIN {survey_questions} sq
+                ON sq.id = sa.question
+              JOIN {survey} s
+                ON s.id = sa.survey
+              JOIN {modules} m
+                ON m.name = :survey
+              JOIN {course_modules} cm
+                ON cm.instance = s.id
+               AND cm.module = m.id
+             WHERE cm.id $insql
+               AND sa.userid = :userid
+          ORDER BY s.id, sq.id";
+        $params = array_merge($inparams, ['survey' => 'survey', 'userid' => $userid]);
+
+        $recordset = $DB->get_recordset_sql($sql, $params);
+        static::recordset_loop_and_export($recordset, 'cmid', [], function($carry, $record) {
+            $q = survey_translate_question((object) [
+                'text' => $record->qtext,
+                'shorttext' => $record->qshorttext,
+                'intro' => $record->qintro,
+                'options' => $record->qoptions
+            ]);
+            $qtype = $record->qtype;
+            $options = explode(',', $q->options);
+
+            $carry[] = [
+                'question' => array_merge((array) $q, [
+                    'options' => $qtype > 0 ? $options : '-'
+                ]),
+                'answer' => [
+                    'actual' => $qtype > 0 && !empty($record->answer1) ? $options[$record->answer1 - 1] : $record->answer1,
+                    'preferred' => $qtype > 0 && !empty($record->answer2) ? $options[$record->answer2 - 1] : $record->answer2,
+                ],
+                'time' => transform::datetime($record->time),
+            ];
+            return $carry;
+
+        }, function($cmid, $data) use ($user) {
+            $context = context_module::instance($cmid);
+            $contextdata = helper::get_context_data($context, $user);
+            $contextdata = (object) array_merge((array) $contextdata, ['answers' => $data]);
+            helper::export_context_files($context, $user);
+            writer::with_context($context)->export_data([], $contextdata);
+        });
+
+        // Export the analysis.
+        $sql = "
+            SELECT sy.*, cm.id as cmid
+              FROM {survey_analysis} sy
+              JOIN {survey} s
+                ON s.id = sy.survey
+              JOIN {modules} m
+                ON m.name = :survey
+              JOIN {course_modules} cm
+                ON cm.instance = s.id
+               AND cm.module = m.id
+             WHERE cm.id $insql
+               AND sy.userid = :userid
+          ORDER BY s.id";
+        $params = array_merge($inparams, ['survey' => 'survey', 'userid' => $userid]);
+
+        $recordset = $DB->get_recordset_sql($sql, $params);
+        static::recordset_loop_and_export($recordset, 'cmid', null, function($carry, $record) {
+            $carry = ['notes' => $record->notes];
+            return $carry;
+        }, function($cmid, $data) {
+            $context = context_module::instance($cmid);
+            writer::with_context($context)->export_related_data([], 'survey_analysis', (object) $data);
+        });
+    }
+
+    /**
+     * Delete all data for all users in the specified context.
+     *
+     * @param context $context The specific context to delete data for.
+     */
+    public static function delete_data_for_all_users_in_context(context $context) {
+        global $DB;
+
+        if ($context->contextlevel != CONTEXT_MODULE) {
+            return;
+        }
+
+        $surveyid = static::get_survey_id_from_context($context);
+        $DB->delete_records('survey_answers', ['survey' => $surveyid]);
+        $DB->delete_records('survey_analysis', ['survey' => $surveyid]);
+    }
+
+    /**
+     * Delete all user data for the specified user, in the specified contexts.
+     *
+     * @param approved_contextlist $contextlist The approved contexts and user information to delete information for.
+     */
+    public static function delete_data_for_user(approved_contextlist $contextlist) {
+        global $DB;
+
+        $userid = $contextlist->get_user()->id;
+        $cmids = array_reduce($contextlist->get_contexts(), function($carry, $context) {
+            if ($context->contextlevel == CONTEXT_MODULE) {
+                $carry[] = $context->instanceid;
+            }
+            return $carry;
+        }, []);
+        if (empty($cmids)) {
+            return;
+        }
+
+        // Fetch the survey IDs.
+        list($insql, $inparams) = $DB->get_in_or_equal($cmids, SQL_PARAMS_NAMED);
+        $sql = "
+            SELECT s.id
+              FROM {survey} s
+              JOIN {modules} m
+                ON m.name = :survey
+              JOIN {course_modules} cm
+                ON cm.instance = s.id
+               AND cm.module = m.id
+             WHERE cm.id $insql";
+        $params = array_merge($inparams, ['survey' => 'survey']);
+        $surveyids = $DB->get_fieldset_sql($sql, $params);
+
+        // Delete all the things.
+        list($insql, $inparams) = $DB->get_in_or_equal($surveyids, SQL_PARAMS_NAMED);
+        $params = array_merge($inparams, ['userid' => $userid]);
+        $DB->delete_records_select('survey_answers', "survey $insql AND userid = :userid", $params);
+        $DB->delete_records_select('survey_analysis', "survey $insql AND userid = :userid", $params);
+    }
+
+    /**
+     * Get a survey ID from its context.
+     *
+     * @param context_module $context The module context.
+     * @return int
+     */
+    protected static function get_survey_id_from_context(context_module $context) {
+        $cm = get_coursemodule_from_id('survey', $context->instanceid, 0, false, MUST_EXIST);
+        return (int) $cm->instance;
+    }
+    /**
+     * Loop and export from a recordset.
+     *
+     * @param moodle_recordset $recordset The recordset.
+     * @param string $splitkey The record key to determine when to export.
+     * @param mixed $initial The initial data to reduce from.
+     * @param callable $reducer The function to return the dataset, receives current dataset, and the current record.
+     * @param callable $export The function to export the dataset, receives the last value from $splitkey and the dataset.
+     * @return void
+     */
+    protected static function recordset_loop_and_export(\moodle_recordset $recordset, $splitkey, $initial,
+            callable $reducer, callable $export) {
+
+        $data = $initial;
+        $lastid = null;
+
+        foreach ($recordset as $record) {
+            if ($lastid && $record->{$splitkey} != $lastid) {
+                $export($lastid, $data);
+                $data = $initial;
+            }
+            $data = $reducer($data, $record);
+            $lastid = $record->{$splitkey};
+        }
+        $recordset->close();
+
+        if (!empty($lastid)) {
+            $export($lastid, $data);
+        }
+    }
+}
index 087f576..8264fad 100644 (file)
@@ -233,6 +233,15 @@ $string['pluginname'] = 'Survey';
 $string['preferred'] = 'Preferred';
 $string['preferredclass'] = 'Class preferred';
 $string['preferredstudent'] = '{$a} preferred';
+$string['privacy:metadata:analysis'] = 'A record of individual\'s answers analysis.';
+$string['privacy:metadata:analysis:notes'] = 'Notes saved against an individual\'s answers.';
+$string['privacy:metadata:analysis:userid'] = 'The user whose answers it is';
+$string['privacy:metadata:answers'] = 'A collection of answers to surveys.';
+$string['privacy:metadata:answers:answer1'] = 'Field to store the answer to a question.';
+$string['privacy:metadata:answers:answer2'] = 'Additional field to store the answer to a question.';
+$string['privacy:metadata:answers:question'] = 'The question.';
+$string['privacy:metadata:answers:time'] = 'The time at which the answer was posted.';
+$string['privacy:metadata:answers:userid'] = 'The user who submitted their answer.';
 $string['question'] = 'Question';
 $string['questions'] = 'Questions';
 $string['questionsnotanswered'] = 'Some of the multiple choice questions have not been answered.';
diff --git a/mod/survey/tests/privacy_test.php b/mod/survey/tests/privacy_test.php
new file mode 100644 (file)
index 0000000..c338073
--- /dev/null
@@ -0,0 +1,416 @@
+<?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/>.
+
+/**
+ * Data provider tests.
+ *
+ * @package    mod_survey
+ * @category   test
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+global $CFG;
+
+use core_privacy\tests\provider_testcase;
+use core_privacy\local\request\approved_contextlist;
+use core_privacy\local\request\transform;
+use core_privacy\local\request\writer;
+use mod_survey\privacy\provider;
+
+require_once($CFG->dirroot . '/mod/survey/lib.php');
+
+/**
+ * Data provider testcase class.
+ *
+ * @package    mod_survey
+ * @category   test
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class mod_survey_privacy_testcase extends provider_testcase {
+
+    public function setUp() {
+        global $PAGE;
+        $this->resetAfterTest();
+        $PAGE->get_renderer('core');
+    }
+
+    public function test_get_contexts_for_userid() {
+        $dg = $this->getDataGenerator();
+
+        $c1 = $dg->create_course();
+        $c2 = $dg->create_course();
+        $cm1a = $dg->create_module('survey', ['template' => 1, 'course' => $c1]);
+        $cm1b = $dg->create_module('survey', ['template' => 2, 'course' => $c1]);
+        $cm1c = $dg->create_module('survey', ['template' => 2, 'course' => $c1]);
+        $cm2a = $dg->create_module('survey', ['template' => 1, 'course' => $c2]);
+        $cm2b = $dg->create_module('survey', ['template' => 1, 'course' => $c2]);
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $this->create_answer($cm1a->id, 1, $u1->id);
+        $this->create_answer($cm1a->id, 1, $u2->id);
+        $this->create_answer($cm1b->id, 1, $u2->id);
+        $this->create_answer($cm2a->id, 1, $u1->id);
+        $this->create_analysis($cm2b->id, $u1->id);
+        $this->create_analysis($cm1c->id, $u2->id);
+
+        $contextids = provider::get_contexts_for_userid($u1->id)->get_contextids();
+        $this->assertCount(3, $contextids);
+        $this->assertTrue(in_array(context_module::instance($cm1a->cmid)->id, $contextids));
+        $this->assertTrue(in_array(context_module::instance($cm2a->cmid)->id, $contextids));
+        $this->assertTrue(in_array(context_module::instance($cm2b->cmid)->id, $contextids));
+
+        $contextids = provider::get_contexts_for_userid($u2->id)->get_contextids();
+        $this->assertCount(3, $contextids);
+        $this->assertTrue(in_array(context_module::instance($cm1a->cmid)->id, $contextids));
+        $this->assertTrue(in_array(context_module::instance($cm1b->cmid)->id, $contextids));
+        $this->assertTrue(in_array(context_module::instance($cm1c->cmid)->id, $contextids));
+    }
+
+    public function test_delete_data_for_all_users_in_context() {
+        global $DB;
+        $dg = $this->getDataGenerator();
+
+        $c1 = $dg->create_course();
+        $cm1a = $dg->create_module('survey', ['template' => 1, 'course' => $c1]);
+        $cm1b = $dg->create_module('survey', ['template' => 2, 'course' => $c1]);
+        $cm1c = $dg->create_module('survey', ['template' => 2, 'course' => $c1]);
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $this->create_answer($cm1a->id, 1, $u1->id);
+        $this->create_answer($cm1a->id, 1, $u2->id);
+        $this->create_answer($cm1b->id, 1, $u2->id);
+        $this->create_answer($cm1c->id, 1, $u1->id);
+        $this->create_analysis($cm1a->id, $u1->id);
+        $this->create_analysis($cm1b->id, $u1->id);
+        $this->create_analysis($cm1a->id, $u2->id);
+        $this->create_analysis($cm1c->id, $u2->id);
+
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1c->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1c->id]));
+
+        // Deleting the course does nothing.
+        provider::delete_data_for_all_users_in_context(context_course::instance($c1->id));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1c->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1c->id]));
+
+        provider::delete_data_for_all_users_in_context(context_module::instance($cm1c->cmid));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertFalse($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1c->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertFalse($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1c->id]));
+
+        provider::delete_data_for_all_users_in_context(context_module::instance($cm1a->cmid));
+        $this->assertFalse($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertFalse($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1c->id]));
+        $this->assertFalse($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1b->id]));
+        $this->assertFalse($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1b->id]));
+        $this->assertFalse($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertFalse($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1c->id]));
+    }
+
+    public function test_delete_data_for_user() {
+        global $DB;
+        $dg = $this->getDataGenerator();
+
+        $c1 = $dg->create_course();
+        $cm1a = $dg->create_module('survey', ['template' => 1, 'course' => $c1]);
+        $cm1b = $dg->create_module('survey', ['template' => 2, 'course' => $c1]);
+        $cm1c = $dg->create_module('survey', ['template' => 2, 'course' => $c1]);
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $this->create_answer($cm1a->id, 1, $u1->id);
+        $this->create_answer($cm1a->id, 1, $u2->id);
+        $this->create_answer($cm1b->id, 1, $u2->id);
+        $this->create_answer($cm1c->id, 1, $u1->id);
+        $this->create_analysis($cm1a->id, $u1->id);
+        $this->create_analysis($cm1b->id, $u1->id);
+        $this->create_analysis($cm1a->id, $u2->id);
+        $this->create_analysis($cm1c->id, $u2->id);
+
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1c->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1c->id]));
+
+        provider::delete_data_for_user(new approved_contextlist($u1, 'mod_survey', [
+            context_course::instance($c1->id)->id,
+            context_module::instance($cm1a->cmid)->id,
+            context_module::instance($cm1b->cmid)->id,
+        ]));
+        $this->assertFalse($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u1->id, 'survey' => $cm1c->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_answers', ['userid' => $u2->id, 'survey' => $cm1b->id]));
+        $this->assertFalse($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1a->id]));
+        $this->assertFalse($DB->record_exists('survey_analysis', ['userid' => $u1->id, 'survey' => $cm1b->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1a->id]));
+        $this->assertTrue($DB->record_exists('survey_analysis', ['userid' => $u2->id, 'survey' => $cm1c->id]));
+    }
+
+    public function test_export_data_for_user() {
+        global $DB;
+        $dg = $this->getDataGenerator();
+
+        $templates = $DB->get_records_menu('survey', array('template' => 0), 'name', 'name, id');
+
+        $c1 = $dg->create_course();
+        $s1a = $dg->create_module('survey', ['template' => $templates['attlsname'], 'course' => $c1]);
+        $s1b = $dg->create_module('survey', ['template' => $templates['ciqname'], 'course' => $c1]);
+        $s1c = $dg->create_module('survey', ['template' => $templates['collesapname'], 'course' => $c1]);
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $s1actx = context_module::instance($s1a->cmid);
+        $s1bctx = context_module::instance($s1b->cmid);
+        $s1cctx = context_module::instance($s1c->cmid);
+
+        $this->answer_survey($s1a, $u1, $c1, $s1actx);
+        $this->answer_survey($s1b, $u1, $c1, $s1bctx);
+        $this->create_analysis($s1a->id, $u1->id, 'Hello,');
+
+        $this->answer_survey($s1a, $u2, $c1, $s1actx);
+        $this->answer_survey($s1c, $u2, $c1, $s1cctx);
+        $this->create_analysis($s1b->id, $u2->id, 'World!');
+
+        provider::export_user_data(new approved_contextlist($u1, 'mod_survey', [$s1actx->id, $s1bctx->id, $s1cctx->id]));
+
+        $data = writer::with_context($s1actx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $this->assert_exported_answers($data->answers, $u1, $s1a);
+        $data = writer::with_context($s1actx)->get_related_data([], 'survey_analysis');
+        $this->assertEquals('Hello,', $data->notes);
+
+        $data = writer::with_context($s1bctx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $this->assert_exported_answers($data->answers, $u1, $s1b);
+        $data = writer::with_context($s1bctx)->get_related_data([], 'survey_analysis');
+        $this->assertEmpty($data);
+
+        $data = writer::with_context($s1cctx)->get_data([]);
+        $this->assertEmpty($data);
+        $data = writer::with_context($s1cctx)->get_related_data([], 'survey_analysis');
+        $this->assertEmpty($data);
+
+        writer::reset();
+        provider::export_user_data(new approved_contextlist($u2, 'mod_survey', [$s1actx->id, $s1bctx->id, $s1cctx->id]));
+
+        $data = writer::with_context($s1actx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $this->assert_exported_answers($data->answers, $u2, $s1a);
+        $data = writer::with_context($s1actx)->get_related_data([], 'survey_analysis');
+        $this->assertEmpty($data);
+
+        $data = writer::with_context($s1bctx)->get_data([]);
+        $this->assertEmpty($data);
+        $data = writer::with_context($s1bctx)->get_related_data([], 'survey_analysis');
+        $this->assertEquals('World!', $data->notes);
+
+        $data = writer::with_context($s1cctx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $this->assert_exported_answers($data->answers, $u2, $s1c);
+        $data = writer::with_context($s1cctx)->get_related_data([], 'survey_analysis');
+        $this->assertEmpty($data);
+    }
+
+    /**
+     * Answer a survey in a predictable manner.
+     *
+     * @param stdClass $survey The survey.
+     * @param stdClass $user The user.
+     * @param stdClass $course The course.
+     * @param context_module $context The module context.
+     * @return void
+     */
+    protected function answer_survey($survey, $user, $course, context_module $context) {
+        global $USER;
+
+        $userid = $user->id;
+        $questions = survey_get_questions($survey);
+        $answer = function(&$answers, $q) use ($userid) {
+            $key = 'q' . ($q->type == 2 ? 'P' : '') . $q->id;
+
+            if ($q->type < 1) {
+                $a = "A:{$q->id}:{$userid}";
+                $answers[$key] = $a;
+
+            } else if ($q->type < 3) {
+                $options = explode(',', get_string($q->options, 'mod_survey'));
+                $answers[$key] = ($q->id + $userid) % count($options) + 1;
+
+            } else {
+                $options = explode(',', get_string($q->options, 'mod_survey'));
+                $answers["q{$q->id}"] = ($q->id + $userid) % count($options) + 1;
+                $answers["qP{$q->id}"] = ($q->id + $userid + 1) % count($options) + 1;
+            }
+
+        };
+
+        foreach ($questions as $q) {
+            if ($q->type < 0) {
+                continue;
+            } else if ($q->type > 0 && $q->multi) {
+                $subquestions = survey_get_subquestions($q);
+                foreach ($subquestions as $sq) {
+                    $answer($answers, $sq);
+                }
+            } else {
+                $answer($answers, $q);
+            }
+        }
+
+        $origuser = $USER;
+        $this->setUser($user);
+        survey_save_answers($survey, $answers, $course, $context);
+        $this->setUser($origuser);
+    }
+
+    /**
+     * Assert the answers provided to a survey.
+     *
+     * @param array $answers The answers.
+     * @param object $user The user.
+     * @param object $survey The survey.
+     * @return void
+     */
+    protected function assert_exported_answers($answers, $user, $survey) {
+        global $DB;
+
+        $userid = $user->id;
+        $questionids = explode(',', $survey->questions);
+        $topquestions = $DB->get_records_list('survey_questions', 'id', $questionids, 'id');
+        $questions = [];
+
+        foreach ($topquestions as $q) {
+            if ($q->type < 0) {
+                continue;
+            } else if ($q->type > 0 && $q->multi) {
+                $questionids = explode(',', $q->multi);
+                $subqs = $DB->get_records_list('survey_questions', 'id', $questionids, 'id');
+            } else {
+                $subqs = [$q];
+            }
+            foreach ($subqs as $sq) {
+                $questions[] = $sq;
+            }
+        }
+
+        $this->assertCount(count($questions), $answers);
+
+        $answer = reset($answers);
+        foreach ($questions as $question) {
+            $qtype = $question->type;
+            $question = survey_translate_question($question);
+            $options = $qtype > 0 ? explode(',', $question->options) : '-';
+            $this->assertEquals($question->text, $answer['question']['text']);
+            $this->assertEquals($question->shorttext, $answer['question']['shorttext']);
+            $this->assertEquals($question->intro, $answer['question']['intro']);
+            $this->assertEquals($options, $answer['question']['options']);
+
+            if ($qtype < 1) {
+                $this->assertEquals("A:{$question->id}:{$userid}", $answer['answer']['actual']);
+
+            } else if ($qtype == 1 || $qtype == 2) {
+                $chosen = ($question->id + $userid) % count($options);
+                $key = $qtype == 1 ? 'actual' : 'preferred';
+                $this->assertEquals($options[$chosen], $answer['answer'][$key]);
+
+            } else {
+                $chosen = ($question->id + $userid) % count($options);
+                $this->assertEquals($options[$chosen], $answer['answer']['actual']);
+                $chosen = ($question->id + $userid + 1) % count($options);
+                $this->assertEquals($options[$chosen], $answer['answer']['preferred']);
+            }
+
+            // Grab next answer, if any.
+            $answer = next($answers);
+        }
+
+    }
+
+    /**
+     * Create analysis.
+     *
+     * @param int $surveyid The survey ID.
+     * @param int $userid The user ID.
+     * @param string $notes The nodes.
+     * @return stdClass
+     */
+    protected function create_analysis($surveyid, $userid, $notes = '') {
+        global $DB;
+        $record = (object) [
+            'survey' => $surveyid,
+            'userid' => $userid,
+            'notes' => $notes
+        ];
+        $record->id = $DB->insert_record('survey_analysis', $record);
+        return $record;
+    }
+
+    /**
+     * Create answer.
+     *
+     * @param int $surveyid The survey ID.
+     * @param int $questionid The question ID.
+     * @param int $userid The user ID.
+     * @param string $answer1 The first answer field.
+     * @param string $answer2 The second answer field.
+     * @return stdClass
+     */
+    protected function create_answer($surveyid, $questionid, $userid, $answer1 = '', $answer2 = '') {
+        global $DB;
+        $record = (object) [
+            'survey' => $surveyid,
+            'question' => $questionid,
+            'userid' => $userid,
+            'answer1' => $answer1,
+            'answer2' => $answer2,
+            'time' => time()
+        ];
+        $record->id = $DB->insert_record('survey_answers', $record);
+        return $record;
+    }
+
+}