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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
/**
 * Privacy tests for core_user.
 *
 * @package    core_user
 * @category   test
 * @copyright  2018 Adrian Greeve <adrian@moodle.com>
 * @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_user\privacy\provider;
use \core_privacy\local\request\approved_userlist;
use \core_privacy\local\request\transform;

require_once($CFG->dirroot . "/user/lib.php");

/**
 * Unit tests for core_user.
 *
 * @copyright  2018 Adrian Greeve <adrian@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class core_user_privacy_testcase extends provider_testcase {

/**
     * Check that context information is returned correctly.
     */
    public function test_get_contexts_for_userid() {
        $this->resetAfterTest();
        $user = $this->getDataGenerator()->create_user();
        // Create some other users as well.
        $user2 = $this->getDataGenerator()->create_user();
        $user3 = $this->getDataGenerator()->create_user();

$context = context_user::instance($user->id);
        $contextlist = \core_user\privacy\provider::get_contexts_for_userid($user->id);
        $this->assertSame($context, $contextlist->current());
    }

/**
     * Test that data is exported as expected for a user.
     */
    public function test_export_user_data() {
        $this->resetAfterTest();
        $user = $this->getDataGenerator()->create_user([
            'firstaccess' => 1535760000,
            'lastaccess' => 1541030400,
            'currentlogin' => 1541030400,
        ]);
        $course = $this->getDataGenerator()->create_course();
        $context = \context_user::instance($user->id);

$this->create_data_for_user($user, $course);

$approvedlist = new \core_privacy\local\request\approved_contextlist($user, 'core_user', [$context->id]);

$writer = \core_privacy\local\request\writer::with_context($context);
        \core_user\privacy\provider::export_user_data($approvedlist);

// Make sure that the password history only returns a count.
        $history = $writer->get_data([get_string('privacy:passwordhistorypath', 'user')]);
        $objectcount = new ArrayObject($history);
        // This object should only have one property.
        $this->assertCount(1, $objectcount);
        $this->assertEquals(1, $history->password_history_count);

// Password resets should have two fields - timerequested and timererequested.
        $resetarray = (array) $writer->get_data([get_string('privacy:passwordresetpath', 'user')]);
        $detail = array_shift($resetarray);
        $this->assertTrue(array_key_exists('timerequested', $detail));
        $this->assertTrue(array_key_exists('timererequested', $detail));

// Last access to course.
        $lastcourseaccess = (array) $writer->get_data([get_string('privacy:lastaccesspath', 'user')]);
        $entry = array_shift($lastcourseaccess);
        $this->assertEquals($course->fullname, $entry['course_name']);
        $this->assertTrue(array_key_exists('timeaccess', $entry));

// User devices.
        $userdevices = (array) $writer->get_data([get_string('privacy:devicespath', 'user')]);
        $entry = array_shift($userdevices);
        $this->assertEquals('com.moodle.moodlemobile', $entry['appid']);
        // Make sure these fields are not exported.
        $this->assertFalse(array_key_exists('pushid', $entry));
        $this->assertFalse(array_key_exists('uuid', $entry));

// Session data.
        $sessiondata = (array) $writer->get_data([get_string('privacy:sessionpath', 'user')]);
        $entry = array_shift($sessiondata);
        // Make sure that the sid is not exported.
        $this->assertFalse(array_key_exists('sid', $entry));
        // Check that some of the other fields are present.
        $this->assertTrue(array_key_exists('state', $entry));
        $this->assertTrue(array_key_exists('sessdata', $entry));
        $this->assertTrue(array_key_exists('timecreated', $entry));

// Course requests
        $courserequestdata = (array) $writer->get_data([get_string('privacy:courserequestpath', 'user')]);
        $entry = array_shift($courserequestdata);
        // Make sure that the password is not exported.
        $this->assertFalse(array_key_exists('password', $entry));
        // Check that some of the other fields are present.
        $this->assertTrue(array_key_exists('fullname', $entry));
        $this->assertTrue(array_key_exists('shortname', $entry));
        $this->assertTrue(array_key_exists('summary', $entry));

// User details.
        $userdata = (array) $writer->get_data([]);
        // Check that the password is not exported.
        $this->assertFalse(array_key_exists('password', $userdata));
        // Check that some critical fields exist.
        $this->assertTrue(array_key_exists('firstname', $userdata));
        $this->assertTrue(array_key_exists('lastname', $userdata));
        $this->assertTrue(array_key_exists('email', $userdata));
        // Check access times.
        $this->assertEquals(transform::datetime($user->firstaccess), $userdata['firstaccess']);
        $this->assertEquals(transform::datetime($user->lastaccess), $userdata['lastaccess']);
        $this->assertNull($userdata['lastlogin']);
        $this->assertEquals(transform::datetime($user->currentlogin), $userdata['currentlogin']);
    }

/**
     * Test that user data is deleted for one user.
     */
    public function test_delete_data_for_all_users_in_context() {
        global $DB;
        $this->resetAfterTest();
        $user = $this->getDataGenerator()->create_user([
            'idnumber' => 'A0023',
            'emailstop' => 1,
            'icq' => 'aksdjf98',
            'phone1' => '555 3257',
            'institution' => 'test',
            'department' => 'Science',
            'city' => 'Perth',
            'country' => 'au'
        ]);
        $user2 = $this->getDataGenerator()->create_user();
        $course = $this->getDataGenerator()->create_course();

$this->create_data_for_user($user, $course);
        $this->create_data_for_user($user2, $course);

\core_user\privacy\provider::delete_data_for_all_users_in_context(context_user::instance($user->id));

// These tables should not have any user data for $user. Only for $user2.
        $records = $DB->get_records('user_password_history');
        $this->assertCount(1, $records);
        $data = array_shift($records);
        $this->assertNotEquals($user->id, $data->userid);
        $this->assertEquals($user2->id, $data->userid);
        $records = $DB->get_records('user_password_resets');
        $this->assertCount(1, $records);
        $data = array_shift($records);
        $this->assertNotEquals($user->id, $data->userid);
        $this->assertEquals($user2->id, $data->userid);
        $records = $DB->get_records('user_lastaccess');
        $this->assertCount(1, $records);
        $data = array_shift($records);
        $this->assertNotEquals($user->id, $data->userid);
        $this->assertEquals($user2->id, $data->userid);
        $records = $DB->get_records('user_devices');
        $this->assertCount(1, $records);
        $data = array_shift($records);
        $this->assertNotEquals($user->id, $data->userid);
        $this->assertEquals($user2->id, $data->userid);

// Now check that there is still a record for the deleted user, but that non-critical information is removed.
        $record = $DB->get_record('user', ['id' => $user->id]);
        $this->assertEmpty($record->idnumber);
        $this->assertEmpty($record->emailstop);
        $this->assertEmpty($record->icq);
        $this->assertEmpty($record->phone1);
        $this->assertEmpty($record->institution);
        $this->assertEmpty($record->department);
        $this->assertEmpty($record->city);
        $this->assertEmpty($record->country);
        $this->assertEmpty($record->timezone);
        $this->assertEmpty($record->timecreated);
        $this->assertEmpty($record->timemodified);
        $this->assertEmpty($record->firstnamephonetic);
        // Check for critical fields.
        // Deleted should now be 1.
        $this->assertEquals(1, $record->deleted);
        $this->assertEquals($user->id, $record->id);
        $this->assertEquals($user->username, $record->username);
        $this->assertEquals($user->password, $record->password);
        $this->assertEquals($user->firstname, $record->firstname);
        $this->assertEquals($user->lastname, $record->lastname);
        $this->assertEquals($user->email, $record->email);
    }

/**
     * Test that user data is deleted for one user.
     */
    public function test_delete_data_for_user() {
        global $DB;
        $this->resetAfterTest();
        $user = $this->getDataGenerator()->create_user([
            'idnumber' => 'A0023',
            'emailstop' => 1,
            'icq' => 'aksdjf98',
            'phone1' => '555 3257',
            'institution' => 'test',
            'department' => 'Science',
            'city' => 'Perth',
            'country' => 'au'
        ]);
        $user2 = $this->getDataGenerator()->create_user();
        $course = $this->getDataGenerator()->create_course();

$this->create_data_for_user($user, $course);
        $this->create_data_for_user($user2, $course);

// Provide multiple different context to check that only the correct user is deleted.
        $contexts = [context_user::instance($user->id)->id, context_user::instance($user2->id)->id, context_system::instance()->id];
        $approvedlist = new \core_privacy\local\request\approved_contextlist($user, 'core_user', $contexts);

\core_user\privacy\provider::delete_data_for_user($approvedlist);

/**
     * Test that only users with a user context are fetched.
     */
    public function test_get_users_in_context() {
        $this->resetAfterTest();

$component = 'core_user';
        // Create a user.
        $user = $this->getDataGenerator()->create_user();
        $usercontext = \context_user::instance($user->id);
        $userlist = new \core_privacy\local\request\userlist($usercontext, $component);

// The list of users for user context should return the user.
        provider::get_users_in_context($userlist);
        $this->assertCount(1, $userlist);
        $expected = [$user->id];
        $actual = $userlist->get_userids();
        $this->assertEquals($expected, $actual);

// The list of users for system context should not return any users.
        $systemcontext = context_system::instance();
        $userlist = new \core_privacy\local\request\userlist($systemcontext, $component);
        provider::get_users_in_context($userlist);
        $this->assertCount(0, $userlist);
    }

/**
     * Test that data for users in approved userlist is deleted.
     */
    public function test_delete_data_for_users() {
        global $DB;

$this->resetAfterTest();

$component = 'core_user';

// Create user1.
        $user1 = $this->getDataGenerator()->create_user([
            'idnumber' => 'A0023',
            'emailstop' => 1,
            'icq' => 'aksdjf98',
            'phone1' => '555 3257',
            'institution' => 'test',
            'department' => 'Science',
            'city' => 'Perth',
            'country' => 'au'
        ]);
        $usercontext1 = \context_user::instance($user1->id);
        $userlist1 = new \core_privacy\local\request\userlist($usercontext1, $component);

// Create user2.
        $user2 = $this->getDataGenerator()->create_user([
            'idnumber' => 'A0024',
            'emailstop' => 1,
            'icq' => 'aksdjf981',
            'phone1' => '555 3258',
            'institution' => 'test',
            'department' => 'Science',
            'city' => 'Perth',
            'country' => 'au'
        ]);
        $usercontext2 = \context_user::instance($user2->id);
        $userlist2 = new \core_privacy\local\request\userlist($usercontext2, $component);

// The list of users for usercontext1 should return user1.
        provider::get_users_in_context($userlist1);
        $this->assertCount(1, $userlist1);
        // The list of users for usercontext2 should return user2.
        provider::get_users_in_context($userlist2);
        $this->assertCount(1, $userlist2);

// Add userlist1 to the approved user list.
        $approvedlist = new approved_userlist($usercontext1, $component, $userlist1->get_userids());
        // Delete using delete_data_for_users().
        provider::delete_data_for_users($approvedlist);

// Now check that there is still a record for user1 (deleted user), but non-critical information is removed.
        $record = $DB->get_record('user', ['id' => $user1->id]);
        $this->assertEmpty($record->idnumber);
        $this->assertEmpty($record->emailstop);
        $this->assertEmpty($record->icq);
        $this->assertEmpty($record->phone1);
        $this->assertEmpty($record->institution);
        $this->assertEmpty($record->department);
        $this->assertEmpty($record->city);
        $this->assertEmpty($record->country);
        $this->assertEmpty($record->timezone);
        $this->assertEmpty($record->timecreated);
        $this->assertEmpty($record->timemodified);
        $this->assertEmpty($record->firstnamephonetic);
        // Check for critical fields.
        // Deleted should now be 1.
        $this->assertEquals(1, $record->deleted);
        $this->assertEquals($user1->id, $record->id);
        $this->assertEquals($user1->username, $record->username);
        $this->assertEquals($user1->password, $record->password);
        $this->assertEquals($user1->firstname, $record->firstname);
        $this->assertEquals($user1->lastname, $record->lastname);
        $this->assertEquals($user1->email, $record->email);

// Now check that the record and information for user2 is still present.
        $record = $DB->get_record('user', ['id' => $user2->id]);
        $this->assertNotEmpty($record->idnumber);
        $this->assertNotEmpty($record->emailstop);
        $this->assertNotEmpty($record->icq);
        $this->assertNotEmpty($record->phone1);
        $this->assertNotEmpty($record->institution);
        $this->assertNotEmpty($record->department);
        $this->assertNotEmpty($record->city);
        $this->assertNotEmpty($record->country);
        $this->assertNotEmpty($record->timezone);
        $this->assertNotEmpty($record->timecreated);
        $this->assertNotEmpty($record->timemodified);
        $this->assertNotEmpty($record->firstnamephonetic);
        $this->assertEquals(0, $record->deleted);
        $this->assertEquals($user2->id, $record->id);
        $this->assertEquals($user2->username, $record->username);
        $this->assertEquals($user2->password, $record->password);
        $this->assertEquals($user2->firstname, $record->firstname);
        $this->assertEquals($user2->lastname, $record->lastname);
        $this->assertEquals($user2->email, $record->email);
    }

/**
     * Create user data for a user.
     *
     * @param  stdClass $user A user object.
     * @param  stdClass $course A course.
     */
    protected function create_data_for_user($user, $course) {
        global $DB;
        $this->resetAfterTest();
        // Last course access.
        $lastaccess = (object) [
            'userid' => $user->id,
            'courseid' => $course->id,
            'timeaccess' => time() - DAYSECS
        ];
        $DB->insert_record('user_lastaccess', $lastaccess);

// Password history.
        $history = (object) [
            'userid' => $user->id,
            'hash' => 'HID098djJUU',
            'timecreated' => time()
        ];
        $DB->insert_record('user_password_history', $history);

// Password resets.
        $passwordreset = (object) [
            'userid' => $user->id,
            'timerequested' => time(),
            'timererequested' => time(),
            'token' => $this->generate_random_string()
        ];
        $DB->insert_record('user_password_resets', $passwordreset);

// User mobile devices.
        $userdevices = (object) [
            'userid' => $user->id,
            'appid' => 'com.moodle.moodlemobile',
            'name' => 'occam',
            'model' => 'Nexus 4',
            'platform' => 'Android',
            'version' => '4.2.2',
            'pushid' => 'kishUhd',
            'uuid' => 'KIhud7s',
            'timecreated' => time(),
            'timemodified' => time()
        ];
        $DB->insert_record('user_devices', $userdevices);

// Course request.
        $courserequest = (object) [
            'fullname' => 'Test Course',
            'shortname' => 'TC',
            'summary' => 'Summary of course',
            'summaryformat' => 1,
            'category' => 1,
            'reason' => 'Because it would be nice.',
            'requester' => $user->id,
            'password' => ''
        ];
        $DB->insert_record('course_request', $courserequest);

// User session table data.
        $usersessions = (object) [
            'state' => 0,
            'sid' => $this->generate_random_string(), // Needs a unique id.
            'userid' => $user->id,
            'sessdata' => 'Nothing',
            'timecreated' => time(),
            'timemodified' => time(),
            'firstip' => '0.0.0.0',
            'lastip' => '0.0.0.0'
        ];
        $DB->insert_record('sessions', $usersessions);
    }

/**
     * Create a random string.
     *
     * @param  integer $length length of the string to generate.
     * @return string A random string.
     */
    protected function generate_random_string($length = 6) {
        $response = '';
        $source = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

if ($length > 0) {

$response = '';
            $source = str_split($source, 1);

for ($i = 1; $i <= $length; $i++) {
                $num = mt_rand(1, count($source));
                $response .= $source[$num - 1];
            }
        }

return $response;
    }
}