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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/>.

/**
 * Data provider tests.
 *
 * @package    mod_chat
 * @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
 */
namespace mod_chat\privacy;

defined('MOODLE_INTERNAL') || die();
global $CFG;

use core_privacy\tests\provider_testcase;
use core_privacy\local\request\approved_contextlist;
use core_privacy\local\request\approved_userlist;
use core_privacy\local\request\transform;
use core_privacy\local\request\writer;
use mod_chat\privacy\provider;

require_once($CFG->dirroot . '/mod/chat/lib.php');

/**
 * Data provider testcase class.
 *
 * @package    mod_chat
 * @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 provider_test extends provider_testcase {

public function setUp(): void {
        global $PAGE;
        $this->resetAfterTest();
        $PAGE->get_renderer('core');

// Chat module is disabled by default, enable it for testing.
        $manager = \core_plugin_manager::resolve_plugininfo_class('mod');
        $manager::enable_plugin('chat', 1);
    }

public function test_get_contexts_for_userid() {
        global $DB;
        $dg = $this->getDataGenerator();
        $c1 = $dg->create_course();
        $c2 = $dg->create_course();

$u1 = $dg->create_user();
        $u2 = $dg->create_user();

$chat1a = $dg->create_module('chat', ['course' => $c1]);
        $chat1b = $dg->create_module('chat', ['course' => $c1]);
        $chat2a = $dg->create_module('chat', ['course' => $c2]);

// Logins but no message.
        $chatuser = $this->login_user_in_course_chat($u1, $c1, $chat1a);

// Logins and messages.
        $chatuser = $this->login_user_in_course_chat($u1, $c1, $chat1b);
        chat_send_chatmessage($chatuser, 'Hello world!');

// Silent login (no system message).
        $chatuser = $this->login_user_in_course_chat($u1, $c2, $chat2a, 0, true);

// Silent login and messages.
        $chatuser = $this->login_user_in_course_chat($u2, $c1, $chat1b, 0, true);
        chat_send_chatmessage($chatuser, 'Ça va ?');
        chat_send_chatmessage($chatuser, 'Moi, ça va.');

// Silent login and messages.
        $chatuser = $this->login_user_in_course_chat($u2, $c2, $chat2a);
        chat_send_chatmessage($chatuser, 'What\'s happening here?');

// Check contexts for user 1.
        $contextids = provider::get_contexts_for_userid($u1->id)->get_contextids();
        $this->assertCount(2, $contextids);
        $this->assertTrue(in_array(\context_module::instance($chat1a->cmid)->id, $contextids));
        $this->assertTrue(in_array(\context_module::instance($chat1b->cmid)->id, $contextids));

$contextids = provider::get_contexts_for_userid($u2->id)->get_contextids();
        $this->assertCount(2, $contextids);
        $this->assertTrue(in_array(\context_module::instance($chat1b->cmid)->id, $contextids));
        $this->assertTrue(in_array(\context_module::instance($chat2a->cmid)->id, $contextids));
    }

/**
     * Test that only users with relevant contexts are fetched.
     */
    public function test_get_users_in_context() {
        $component = 'mod_chat';
        $dg = $this->getDataGenerator();
        $c1 = $dg->create_course();
        $c2 = $dg->create_course();

$u1 = $dg->create_user();
        $u2 = $dg->create_user();

$chat1a = $dg->create_module('chat', ['course' => $c1]);
        $chat1b = $dg->create_module('chat', ['course' => $c1]);
        $chat2a = $dg->create_module('chat', ['course' => $c2]);

// Logins but no message.
        $chatuser = $this->login_user_in_course_chat($u1, $c1, $chat1a);

// Logins and messages.
        $chatuser = $this->login_user_in_course_chat($u1, $c1, $chat1b);
        chat_send_chatmessage($chatuser, 'Hello world!');

// Silent login (no system message).
        $chatuser = $this->login_user_in_course_chat($u1, $c2, $chat2a, 0, true);

// Silent login and messages.
        $chatuser = $this->login_user_in_course_chat($u2, $c2, $chat2a);
        chat_send_chatmessage($chatuser, 'What\'s happening here?');

$context1a = \context_module::instance($chat1a->cmid);
        $context1b = \context_module::instance($chat1b->cmid);
        $context2a = \context_module::instance($chat2a->cmid);

$userlist1a = new \core_privacy\local\request\userlist($context1a, $component);
        $userlist1b = new \core_privacy\local\request\userlist($context1b, $component);
        $userlist2a = new \core_privacy\local\request\userlist($context2a, $component);
        \mod_chat\privacy\provider::get_users_in_context($userlist1a);
        \mod_chat\privacy\provider::get_users_in_context($userlist1b);
        \mod_chat\privacy\provider::get_users_in_context($userlist2a);

// Ensure correct users are found in relevant contexts.
        $this->assertCount(1, $userlist1a);
        $expected = [$u1->id];
        $actual = $userlist1a->get_userids();
        $this->assertEquals($expected, $actual);

$this->assertCount(2, $userlist1b);
        $expected = [$u1->id, $u2->id];
        $actual = $userlist1b->get_userids();
        sort($expected);
        sort($actual);
        $this->assertEquals($expected, $actual);

$this->assertCount(1, $userlist2a);
        $expected = [$u1->id];
        $actual = $userlist1a->get_userids();
        $this->assertEquals($expected, $actual);
    }

public function test_delete_data_for_all_users_in_context() {
        global $DB;
        $dg = $this->getDataGenerator();
        $c1 = $dg->create_course();

$u1 = $dg->create_user();
        $u2 = $dg->create_user();

$chat1a = $dg->create_module('chat', ['course' => $c1]);
        $chat1b = $dg->create_module('chat', ['course' => $c1]);
        $chat1actx = \context_module::instance($chat1a->cmid);
        $chat1bctx = \context_module::instance($chat1b->cmid);

$u1chat1a = $this->login_user_in_course_chat($u1, $c1, $chat1a);
        $u2chat1a = $this->login_user_in_course_chat($u2, $c1, $chat1a);
        chat_send_chatmessage($u1chat1a, 'Ça va ?');
        chat_send_chatmessage($u2chat1a, 'Oui, et toi ?');
        chat_send_chatmessage($u1chat1a, 'Bien merci.');
        chat_send_chatmessage($u2chat1a, 'Pourquoi ils disent omelette "du" fromage ?!');
        chat_send_chatmessage($u1chat1a, 'Aucune idée');
        $this->assert_has_data_in_chat($u1, $chat1a);
        $this->assert_has_data_in_chat($u2, $chat1a);

$u1chat1b = $this->login_user_in_course_chat($u1, $c1, $chat1b);
        $u2chat1b = $this->login_user_in_course_chat($u2, $c1, $chat1b);
        chat_send_chatmessage($u1chat1b, 'How are you going?');
        chat_send_chatmessage($u2chat1b, 'Alright, you?');
        chat_send_chatmessage($u1chat1b, 'Good, thanks.');
        chat_send_chatmessage($u2chat1b, 'Sacre bleu!');
        chat_send_chatmessage($u1chat1b, '\ö/');
        $this->assert_has_data_in_chat($u1, $chat1b);
        $this->assert_has_data_in_chat($u2, $chat1b);

// No change.
        provider::delete_data_for_all_users_in_context(\context_course::instance($c1->id));
        $this->assert_has_data_in_chat($u1, $chat1a);
        $this->assert_has_data_in_chat($u2, $chat1a);
        $this->assert_has_data_in_chat($u1, $chat1b);
        $this->assert_has_data_in_chat($u2, $chat1b);

// Deletinge first chat does not affect other chat.
        provider::delete_data_for_all_users_in_context($chat1actx);
        $this->assert_has_no_data_in_chat($u1, $chat1a);
        $this->assert_has_no_data_in_chat($u2, $chat1a);
        $this->assert_has_data_in_chat($u1, $chat1b);
        $this->assert_has_data_in_chat($u2, $chat1b);
    }

public function test_delete_data_for_user() {
        global $DB;
        $dg = $this->getDataGenerator();
        $c1 = $dg->create_course();

$u1 = $dg->create_user();
        $u2 = $dg->create_user();

provider::delete_data_for_user(new approved_contextlist($u1, 'mod_chat', [$chat1actx->id]));
        $this->assert_has_no_data_in_chat($u1, $chat1a);
        $this->assert_has_data_in_chat($u2, $chat1a);
        $this->assert_has_data_in_chat($u1, $chat1b);
        $this->assert_has_data_in_chat($u2, $chat1b);

provider::delete_data_for_user(new approved_contextlist($u2, 'mod_chat', [$chat1actx->id, $chat1bctx->id]));
        $this->assert_has_no_data_in_chat($u1, $chat1a);
        $this->assert_has_no_data_in_chat($u2, $chat1a);
        $this->assert_has_data_in_chat($u1, $chat1b);
        $this->assert_has_no_data_in_chat($u2, $chat1b);
    }

/**
     * Test that data for users in approved userlist is deleted.
     */
    public function test_delete_data_for_users() {
        global $DB;
        $component = 'mod_chat';
        $dg = $this->getDataGenerator();
        $c1 = $dg->create_course();

$u1 = $dg->create_user();
        $u2 = $dg->create_user();
        $u3 = $dg->create_user();

$chat1 = $dg->create_module('chat', ['course' => $c1]);
        $chat1context = \context_module::instance($chat1->cmid);

$u1chat1 = $this->login_user_in_course_chat($u1, $c1, $chat1);
        $u2chat1 = $this->login_user_in_course_chat($u2, $c1, $chat1);
        $u3chat1 = $this->login_user_in_course_chat($u3, $c1, $chat1);
        chat_send_chatmessage($u1chat1, 'Ça va ?');
        chat_send_chatmessage($u2chat1, 'Oui, et toi ?');
        chat_send_chatmessage($u1chat1, 'Bien merci.');
        chat_send_chatmessage($u2chat1, 'Pourquoi ils disent omelette "du" fromage ?!');
        chat_send_chatmessage($u1chat1, 'Aucune idée');
        chat_send_chatmessage($u3chat1, 'Je ne comprends pas');
        $this->assert_has_data_in_chat($u1, $chat1);
        $this->assert_has_data_in_chat($u2, $chat1);
        $this->assert_has_data_in_chat($u3, $chat1);

$chat2 = $dg->create_module('chat', ['course' => $c1]);

$u1chat2 = $this->login_user_in_course_chat($u1, $c1, $chat2);
        $u2chat2 = $this->login_user_in_course_chat($u2, $c1, $chat2);
        $u3chat2 = $this->login_user_in_course_chat($u3, $c1, $chat2);
        chat_send_chatmessage($u1chat2, 'Why do we have a separate chat?');
        chat_send_chatmessage($u2chat2, 'I have no idea!');
        chat_send_chatmessage($u3chat2, 'Me either.');
        $this->assert_has_data_in_chat($u1, $chat2);
        $this->assert_has_data_in_chat($u2, $chat2);
        $this->assert_has_data_in_chat($u3, $chat2);

// Delete user 1 and 2 data from chat 1 context only.
        $approveduserids = [$u1->id, $u2->id];
        $approvedlist = new approved_userlist($chat1context, $component, $approveduserids);
        provider::delete_data_for_users($approvedlist);

// Ensure correct chat data is deleted.
        $this->assert_has_no_data_in_chat($u1, $chat1);
        $this->assert_has_no_data_in_chat($u2, $chat1);
        $this->assert_has_data_in_chat($u3, $chat1);

$this->assert_has_data_in_chat($u1, $chat2);
        $this->assert_has_data_in_chat($u2, $chat2);
        $this->assert_has_data_in_chat($u3, $chat2);
    }

public function test_export_data_for_user() {
        global $DB;
        $dg = $this->getDataGenerator();
        $c1 = $dg->create_course();

$u1 = $dg->create_user();
        $u2 = $dg->create_user();

// Export for user 1 in chat 1.
        provider::export_user_data(new approved_contextlist($u1, 'mod_chat', [$chat1actx->id]));
        $data = writer::with_context($chat1actx)->get_data([]);
        $this->assertNotEmpty($data);
        $this->assertCount(5, $data->messages);
        $this->assertEquals(get_string('messageenter', 'mod_chat', fullname($u1)), $data->messages[0]['message']);
        $this->assertEquals(transform::yesno(true), $data->messages[0]['is_system_generated']);
        $this->assertEquals('Ça va ?', $data->messages[1]['message']);
        $this->assertEquals(transform::yesno(false), $data->messages[1]['is_system_generated']);
        $this->assertEquals('Bien merci.', $data->messages[2]['message']);
        $this->assertEquals(transform::yesno(false), $data->messages[2]['is_system_generated']);
        $this->assertEquals('Aucune idée', $data->messages[3]['message']);
        $this->assertEquals(transform::yesno(false), $data->messages[3]['is_system_generated']);
        $this->assertEquals(get_string('messageexit', 'mod_chat', fullname($u1)), $data->messages[4]['message']);
        $this->assertEquals(transform::yesno(true), $data->messages[4]['is_system_generated']);
        $data = writer::with_context($chat1bctx)->get_data([]);
        $this->assertEmpty($data);

// Export for user2 in chat 1 and 2.
        writer::reset();
        provider::export_user_data(new approved_contextlist($u2, 'mod_chat', [$chat1actx->id, $chat1bctx->id]));
        $data = writer::with_context($chat1actx)->get_data([]);
        $this->assertNotEmpty($data);
        $this->assertCount(3, $data->messages);
        $this->assertEquals(get_string('messageenter', 'mod_chat', fullname($u2)), $data->messages[0]['message']);
        $this->assertEquals('Oui, et toi ?', $data->messages[1]['message']);
        $this->assertEquals('Pourquoi ils disent omelette "du" fromage ?!', $data->messages[2]['message']);
        $data = writer::with_context($chat1bctx)->get_data([]);
        $this->assertNotEmpty($data);
        $this->assertCount(3, $data->messages);
        $this->assertEquals(get_string('messageenter', 'mod_chat', fullname($u2)), $data->messages[0]['message']);
        $this->assertEquals('Alright, you?', $data->messages[1]['message']);
        $this->assertEquals('Sacre bleu!', $data->messages[2]['message']);
    }

/**
     * Assert that there is data for a user in a chat.
     *
     * @param object $user The user.
     * @param object $chat The chat.
     * @return void
     */
    protected function assert_has_data_in_chat($user, $chat) {
        $this->assertTrue($this->has_data_in_chat($user, $chat));
    }

/**
     * Assert that there isn't any data for a user in a chat.
     *
     * @param object $user The user.
     * @param object $chat The chat.
     * @return void
     */
    protected function assert_has_no_data_in_chat($user, $chat) {
        $this->assertFalse($this->has_data_in_chat($user, $chat));
    }

/**
     * Check whether a user has data in a chat.
     *
     * @param object $user The user.
     * @param object $chat The chat.
     * @return bool
     */
    protected function has_data_in_chat($user, $chat) {
        global $DB;
        return $DB->record_exists('chat_messages', ['chatid' => $chat->id, 'userid' => $user->id]);
    }

/**
     * Login a user in a chat.
     *
     * @param object $user The user.
     * @param object $course The course.
     * @param object $chat The chat.
     * @param int $group The group number.
     * @param bool $silent Whether we should advertise that the user logs in.
     * @return object The chat user.
     */
    protected function login_user_in_course_chat($user, $course, $chat, $group = 0, $silent = false) {
        global $DB, $USER;
        $origuser = $USER;
        $this->setUser($user);
        chat_login_user($chat->id, $silent ? 'sockets' : 'basic', 0, $course);
        $chatuser = $DB->get_record('chat_users', ['userid' => $user->id, 'chatid' => $chat->id, 'groupid' => 0]);
        $this->setUser($origuser);
        return $chatuser;
    }
}

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