class DbLogTest

class DbLogTest extends BrowserTestBase {
    use FakeLogEntries;
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'dblog',
        'error_test',
        'node',
        'forum',
        'help',
        'block',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'classy';
    
    /**
     * A user with some relevant administrative permissions.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * A user without any permissions.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $webUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $this->drupalPlaceBlock('system_breadcrumb_block');
        $this->drupalPlaceBlock('page_title_block');
        // Create users with specific permissions.
        $this->adminUser = $this->drupalCreateUser([
            'administer site configuration',
            'access administration pages',
            'access site reports',
            'administer users',
        ]);
        $this->webUser = $this->drupalCreateUser([]);
    }
    
    /**
     * Tests Database Logging module functionality through interfaces.
     *
     * First logs in users, then creates database log events, and finally tests
     * Database Logging module functionality through both the admin and user
     * interfaces.
     */
    public function testDbLog() {
        // Log in the admin user.
        $this->drupalLogin($this->adminUser);
        $row_limit = 100;
        $this->verifyRowLimit($row_limit);
        $this->verifyEvents();
        $this->verifyReports();
        $this->verifyBreadcrumbs();
        $this->verifyLinkEscaping();
        // Verify the overview table sorting.
        $orders = [
            'Date',
            'Type',
            'User',
        ];
        $sorts = [
            'asc',
            'desc',
        ];
        foreach ($orders as $order) {
            foreach ($sorts as $sort) {
                $this->verifySort($sort, $order);
            }
        }
        // Log in the regular user.
        $this->drupalLogin($this->webUser);
        $this->verifyReports(403);
    }
    
    /**
     * Test individual log event page.
     */
    public function testLogEventPage() {
        // Login the admin user.
        $this->drupalLogin($this->adminUser);
        // Since referrer and location links vary by how the tests are run, inject
        // fake log data to test these.
        $context = [
            'request_uri' => 'http://example.com?dblog=1',
            'referer' => 'http://example.org?dblog=2',
            'uid' => 0,
            'channel' => 'testing',
            'link' => 'foo/bar',
            'ip' => '0.0.1.0',
            'timestamp' => REQUEST_TIME,
        ];
        \Drupal::service('logger.dblog')->log(RfcLogLevel::NOTICE, 'Test message', $context);
        $query = Database::getConnection()->select('watchdog');
        $query->addExpression('MAX(wid)');
        $wid = $query->execute()
            ->fetchField();
        // Verify the links appear correctly.
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $this->assertLinkByHref($context['request_uri']);
        $this->assertLinkByHref($context['referer']);
        // Verify hostname.
        $this->assertRaw($context['ip'], 'Found hostname on the detail page.');
        // Verify location.
        $this->assertRaw($context['request_uri'], 'Found location on the detail page.');
        // Verify severity.
        $this->assertText('Notice', 'The severity was properly displayed on the detail page.');
    }
    
    /**
     * Tests that a 403 event is logged with the exception triggering it.
     */
    public function test403LogEventPage() {
        $assert_session = $this->assertSession();
        $uri = 'admin/reports';
        $this->drupalLogin($this->webUser);
        $this->drupalGet($uri);
        $assert_session->statusCodeEquals(403);
        $this->drupalLogin($this->adminUser);
        $query = Database::getConnection()->select('watchdog')
            ->condition('type', 'access denied');
        $query->addExpression('MAX(wid)');
        $wid = $query->execute()
            ->fetchField();
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $table = $this->xpath("//table[@class='dblog-event']");
        $this->assertCount(1, $table);
        // Verify type, severity and location.
        $type = $table[0]->findAll('xpath', "//tr/th[contains(text(), 'Type')]/../td");
        $this->assertCount(1, $type);
        $this->assertEquals('access denied', $type[0]->getText());
        $severity = $table[0]->findAll('xpath', "//tr/th[contains(text(), 'Severity')]/../td");
        $this->assertCount(1, $severity);
        $this->assertEquals('Warning', $severity[0]->getText());
        $location = $table[0]->findAll('xpath', "//tr/th[contains(text(), 'Location')]/../td/a");
        $this->assertCount(1, $location);
        $href = $location[0]->getAttribute('href');
        $this->assertEquals($this->baseUrl . '/' . $uri, $href);
        // Verify message.
        $message = $table[0]->findAll('xpath', "//tr/th[contains(text(), 'Message')]/../td");
        $this->assertCount(1, $message);
        $regex = "@Path: .+admin/reports\\. Drupal\\\\Core\\\\Http\\\\Exception\\\\CacheableAccessDeniedHttpException: The 'access site reports' permission is required\\. in Drupal\\\\Core\\\\Routing\\\\AccessAwareRouter->checkAccess\\(\\) \\(line \\d+ of .+/core/lib/Drupal/Core/Routing/AccessAwareRouter\\.php\\)\\.@";
        $this->assertRegExp($regex, $message[0]->getText());
    }
    
    /**
     * Test not-existing log event page.
     */
    public function testLogEventNotFoundPage() {
        // Login the admin user.
        $this->drupalLogin($this->adminUser);
        // Try to read details of not existing event.
        $this->drupalGet('admin/reports/dblog/event/999999');
        // Verify 404 response.
        $this->assertSession()
            ->statusCodeEquals(404);
    }
    
    /**
     * Test individual log event page with missing log attributes.
     *
     * In some cases few log attributes are missing. For example:
     * - Missing referer: When request is made to a specific url directly and
     *   error occurred. In this case there is no referer.
     * - Incorrect location: When location attribute is incorrect uri which can
     *   not be used to generate a valid link.
     */
    public function testLogEventPageWithMissingInfo() {
        $this->drupalLogin($this->adminUser);
        $connection = Database::getConnection();
        // Test log event page with missing referer.
        $this->generateLogEntries(1, [
            'referer' => NULL,
        ]);
        $query = $connection->select('watchdog');
        $query->addExpression('MAX(wid)');
        $wid = $query->execute()
            ->fetchField();
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        // Verify table headers are present, even though the referrer is missing.
        $this->assertText('Referrer', 'Referrer header is present on the detail page.');
        // Verify severity.
        $this->assertText('Notice', 'The severity is properly displayed on the detail page.');
        // Test log event page with incorrect location.
        $request_uri = '/some/incorrect/url';
        $this->generateLogEntries(1, [
            'request_uri' => $request_uri,
        ]);
        $query = $connection->select('watchdog');
        $query->addExpression('MAX(wid)');
        $wid = $query->execute()
            ->fetchField();
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        // Verify table headers are present.
        $this->assertText('Location', 'Location header is present on the detail page.');
        // Verify severity.
        $this->assertText('Notice', 'The severity is properly displayed on the detail page.');
        // Verify location is available as plain text.
        $this->assertEquals($request_uri, $this->cssSelect('table.dblog-event > tbody > tr:nth-child(4) > td')[0]
            ->getHtml());
        $this->assertSession()
            ->linkNotExists($request_uri);
    }
    
    /**
     * Verifies setting of the database log row limit.
     *
     * @param int $row_limit
     *   The row limit.
     */
    private function verifyRowLimit($row_limit) {
        // Change the database log row limit.
        $edit = [];
        $edit['dblog_row_limit'] = $row_limit;
        $this->drupalPostForm('admin/config/development/logging', $edit, t('Save configuration'));
        $this->assertSession()
            ->statusCodeEquals(200);
        // Check row limit variable.
        $current_limit = $this->config('dblog.settings')
            ->get('row_limit');
        $this->assertEquals($current_limit, $row_limit, new FormattableMarkup('[Cache] Row limit variable of @count equals row limit of @limit', [
            '@count' => $current_limit,
            '@limit' => $row_limit,
        ]));
    }
    
    /**
     * Clear the entry logs by clicking on 'Clear log messages' button.
     */
    protected function clearLogsEntries() {
        $this->drupalGet(Url::fromRoute('dblog.confirm'));
    }
    
    /**
     * Filters the logs according to the specific severity and log entry type.
     *
     * @param string $type
     *   (optional) The log entry type.
     * @param string $severity
     *   (optional) The log entry severity.
     */
    protected function filterLogsEntries($type = NULL, $severity = NULL) {
        $edit = [];
        if (isset($type)) {
            $edit['type[]'] = $type;
        }
        if (isset($severity)) {
            $edit['severity[]'] = $severity;
        }
        $this->drupalPostForm(NULL, $edit, t('Filter'));
    }
    
    /**
     * Confirms that database log reports are displayed at the correct paths.
     *
     * @param int $response
     *   (optional) HTTP response code. Defaults to 200.
     */
    private function verifyReports($response = 200) {
        // View the database log help page.
        $this->drupalGet('admin/help/dblog');
        $this->assertSession()
            ->statusCodeEquals($response);
        if ($response == 200) {
            $this->assertText(t('Database Logging'), 'DBLog help was displayed');
        }
        // View the database log report page.
        $this->drupalGet('admin/reports/dblog');
        $this->assertSession()
            ->statusCodeEquals($response);
        if ($response == 200) {
            $this->assertText(t('Recent log messages'), 'DBLog report was displayed');
        }
        $this->drupalGet('admin/reports/dblog/confirm');
        $this->assertSession()
            ->statusCodeEquals($response);
        if ($response == 200) {
            $this->assertText(t('Are you sure you want to delete the recent logs?'), 'DBLog clear logs form was displayed');
        }
        // View the database log page-not-found report page.
        $this->drupalGet('admin/reports/page-not-found');
        $this->assertSession()
            ->statusCodeEquals($response);
        if ($response == 200) {
            $this->assertText("Top 'page not found' errors", 'DBLog page-not-found report was displayed');
        }
        // View the database log access-denied report page.
        $this->drupalGet('admin/reports/access-denied');
        $this->assertSession()
            ->statusCodeEquals($response);
        if ($response == 200) {
            $this->assertText("Top 'access denied' errors", 'DBLog access-denied report was displayed');
        }
        // View the database log event page.
        $query = Database::getConnection()->select('watchdog');
        $query->addExpression('MIN(wid)');
        $wid = $query->execute()
            ->fetchField();
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $this->assertSession()
            ->statusCodeEquals($response);
        if ($response == 200) {
            $this->assertText(t('Details'), 'DBLog event node was displayed');
        }
    }
    
    /**
     * Generates and then verifies breadcrumbs.
     */
    private function verifyBreadcrumbs() {
        // View the database log event page.
        $query = Database::getConnection()->select('watchdog');
        $query->addExpression('MIN(wid)');
        $wid = $query->execute()
            ->fetchField();
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $xpath = '//nav[@class="breadcrumb"]/ol/li[last()]/a';
        $this->assertEqual(current($this->xpath($xpath))
            ->getText(), 'Recent log messages', 'DBLogs link displayed at breadcrumb in event page.');
    }
    
    /**
     * Generates and then verifies various types of events.
     */
    private function verifyEvents() {
        // Invoke events.
        $this->doUser();
        $this->drupalCreateContentType([
            'type' => 'article',
            'name' => t('Article'),
        ]);
        $this->drupalCreateContentType([
            'type' => 'page',
            'name' => t('Basic page'),
        ]);
        $this->doNode('article');
        $this->doNode('page');
        $this->doNode('forum');
        // When a user account is canceled, any content they created remains but the
        // uid = 0. Records in the watchdog table related to that user have the uid
        // set to zero.
    }
    
    /**
     * Verifies the sorting functionality of the database logging reports table.
     *
     * @param string $sort
     *   The sort direction.
     * @param string $order
     *   The order by which the table should be sorted.
     */
    public function verifySort($sort = 'asc', $order = 'Date') {
        $this->drupalGet('admin/reports/dblog', [
            'query' => [
                'sort' => $sort,
                'order' => $order,
            ],
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertText(t('Recent log messages'), 'DBLog report was displayed correctly and sorting went fine.');
    }
    
    /**
     * Tests the escaping of links in the operation row of a database log detail
     * page.
     */
    private function verifyLinkEscaping() {
        $link = Link::fromTextAndUrl('View', Url::fromRoute('entity.node.canonical', [
            'node' => 1,
        ]))->toString();
        $message = 'Log entry added to do the verifyLinkEscaping test.';
        $this->generateLogEntries(1, [
            'message' => $message,
            'link' => $link,
        ]);
        $result = Database::getConnection()->select('watchdog', 'w')
            ->fields('w', [
            'wid',
        ])
            ->orderBy('wid', 'DESC')
            ->range(0, 1)
            ->execute();
        $this->drupalGet('admin/reports/dblog/event/' . $result->fetchField());
        // Check if the link exists (unescaped).
        $this->assertRaw($link);
    }
    
    /**
     * Generates and then verifies some user events.
     */
    private function doUser() {
        // Set user variables.
        $name = $this->randomMachineName();
        $pass = user_password();
        // Add a user using the form to generate an add user event (which is not
        // triggered by drupalCreateUser).
        $edit = [];
        $edit['name'] = $name;
        $edit['mail'] = $name . '@example.com';
        $edit['pass[pass1]'] = $pass;
        $edit['pass[pass2]'] = $pass;
        $edit['status'] = 1;
        $this->drupalPostForm('admin/people/create', $edit, t('Create new account'));
        $this->assertSession()
            ->statusCodeEquals(200);
        // Retrieve the user object.
        $user = user_load_by_name($name);
        $this->assertNotNull($user, new FormattableMarkup('User @name was loaded', [
            '@name' => $name,
        ]));
        // pass_raw property is needed by drupalLogin.
        $user->passRaw = $pass;
        // Log in user.
        $this->drupalLogin($user);
        // Log out user.
        $this->drupalLogout();
        // Fetch the row IDs in watchdog that relate to the user.
        $result = Database::getConnection()->select('watchdog', 'w')
            ->fields('w', [
            'wid',
        ])
            ->condition('uid', $user->id())
            ->execute();
        foreach ($result as $row) {
            $ids[] = $row->wid;
        }
        $count_before = isset($ids) ? count($ids) : 0;
        $this->assertGreaterThan(0, $count_before, new FormattableMarkup('DBLog contains @count records for @name', [
            '@count' => $count_before,
            '@name' => $user->getAccountName(),
        ]));
        // Log in the admin user.
        $this->drupalLogin($this->adminUser);
        // Delete the user created at the start of this test.
        // We need to POST here to invoke batch_process() in the internal browser.
        $this->drupalPostForm('user/' . $user->id() . '/cancel', [
            'user_cancel_method' => 'user_cancel_reassign',
        ], t('Cancel account'));
        // View the database log report.
        $this->drupalGet('admin/reports/dblog');
        $this->assertSession()
            ->statusCodeEquals(200);
        // Verify that the expected events were recorded.
        // Add user.
        // Default display includes name and email address; if too long, the email
        // address is replaced by three periods.
        $this->assertLogMessage(t('New user: %name %email.', [
            '%name' => $name,
            '%email' => '<' . $user->getEmail() . '>',
        ]), 'DBLog event was recorded: [add user]');
        // Log in user.
        $this->assertLogMessage(t('Session opened for %name.', [
            '%name' => $name,
        ]), 'DBLog event was recorded: [login user]');
        // Log out user.
        $this->assertLogMessage(t('Session closed for %name.', [
            '%name' => $name,
        ]), 'DBLog event was recorded: [logout user]');
        // Delete user.
        $message = t('Deleted user: %name %email.', [
            '%name' => $name,
            '%email' => '<' . $user->getEmail() . '>',
        ]);
        $message_text = Unicode::truncate(Html::decodeEntities(strip_tags($message)), 56, TRUE, TRUE);
        // Verify that the full message displays on the details page.
        $link = FALSE;
        if ($links = $this->xpath('//a[text()="' . $message_text . '"]')) {
            // Found link with the message text.
            $links = array_shift($links);
            $value = $links->getAttribute('href');
            // Extract link to details page.
            $link = mb_substr($value, strpos($value, 'admin/reports/dblog/event/'));
            $this->drupalGet($link);
            // Check for full message text on the details page.
            $this->assertRaw($message, 'DBLog event details was found: [delete user]');
        }
        $this->assertNotEmpty($link, 'DBLog event was recorded: [delete user]');
        // Visit random URL (to generate page not found event).
        $not_found_url = $this->randomMachineName(60);
        $this->drupalGet($not_found_url);
        $this->assertSession()
            ->statusCodeEquals(404);
        // View the database log page-not-found report page.
        $this->drupalGet('admin/reports/page-not-found');
        $this->assertSession()
            ->statusCodeEquals(200);
        // Check that full-length URL displayed.
        $this->assertText($not_found_url, 'DBLog event was recorded: [page not found]');
    }
    
    /**
     * Generates and then verifies some node events.
     *
     * @param string $type
     *   A node type (e.g., 'article', 'page' or 'forum').
     */
    private function doNode($type) {
        // Create user.
        $perm = [
            'create ' . $type . ' content',
            'edit own ' . $type . ' content',
            'delete own ' . $type . ' content',
        ];
        $user = $this->drupalCreateUser($perm);
        // Log in user.
        $this->drupalLogin($user);
        // Create a node using the form in order to generate an add content event
        // (which is not triggered by drupalCreateNode).
        $edit = $this->getContent($type);
        $title = $edit['title[0][value]'];
        $this->drupalPostForm('node/add/' . $type, $edit, t('Save'));
        $this->assertSession()
            ->statusCodeEquals(200);
        // Retrieve the node object.
        $node = $this->drupalGetNodeByTitle($title);
        $this->assertNotNull($node, new FormattableMarkup('Node @title was loaded', [
            '@title' => $title,
        ]));
        // Edit the node.
        $edit = $this->getContentUpdate($type);
        $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save'));
        $this->assertSession()
            ->statusCodeEquals(200);
        // Delete the node.
        $this->drupalPostForm('node/' . $node->id() . '/delete', [], t('Delete'));
        $this->assertSession()
            ->statusCodeEquals(200);
        // View the node (to generate page not found event).
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->statusCodeEquals(404);
        // View the database log report (to generate access denied event).
        $this->drupalGet('admin/reports/dblog');
        $this->assertSession()
            ->statusCodeEquals(403);
        // Log in the admin user.
        $this->drupalLogin($this->adminUser);
        // View the database log report.
        $this->drupalGet('admin/reports/dblog');
        $this->assertSession()
            ->statusCodeEquals(200);
        // Verify that node events were recorded.
        // Was node content added?
        $this->assertLogMessage(t('@type: added %title.', [
            '@type' => $type,
            '%title' => $title,
        ]), 'DBLog event was recorded: [content added]');
        // Was node content updated?
        $this->assertLogMessage(t('@type: updated %title.', [
            '@type' => $type,
            '%title' => $title,
        ]), 'DBLog event was recorded: [content updated]');
        // Was node content deleted?
        $this->assertLogMessage(t('@type: deleted %title.', [
            '@type' => $type,
            '%title' => $title,
        ]), 'DBLog event was recorded: [content deleted]');
        // View the database log access-denied report page.
        $this->drupalGet('admin/reports/access-denied');
        $this->assertSession()
            ->statusCodeEquals(200);
        // Verify that the 'access denied' event was recorded.
        $this->assertText('admin/reports/dblog', 'DBLog event was recorded: [access denied]');
        // View the database log page-not-found report page.
        $this->drupalGet('admin/reports/page-not-found');
        $this->assertSession()
            ->statusCodeEquals(200);
        // Verify that the 'page not found' event was recorded.
        $this->assertText('node/' . $node->id(), 'DBLog event was recorded: [page not found]');
    }
    
    /**
     * Creates random content based on node content type.
     *
     * @param string $type
     *   Node content type (e.g., 'article').
     *
     * @return array
     *   Random content needed by various node types.
     */
    private function getContent($type) {
        switch ($type) {
            case 'forum':
                $content = [
                    'title[0][value]' => $this->randomMachineName(8),
                    'taxonomy_forums' => 1,
                    'body[0][value]' => $this->randomMachineName(32),
                ];
                break;
            default:
                $content = [
                    'title[0][value]' => $this->randomMachineName(8),
                    'body[0][value]' => $this->randomMachineName(32),
                ];
                break;
        }
        return $content;
    }
    
    /**
     * Creates random content as an update based on node content type.
     *
     * @param string $type
     *   Node content type (e.g., 'article').
     *
     * @return array
     *   Random content needed by various node types.
     */
    private function getContentUpdate($type) {
        $content = [
            'body[0][value]' => $this->randomMachineName(32),
        ];
        return $content;
    }
    
    /**
     * Tests the addition and clearing of log events through the admin interface.
     *
     * Logs in the admin user, creates a database log event, and tests the
     * functionality of clearing the database log through the admin interface.
     */
    public function testDBLogAddAndClear() {
        global $base_root;
        $connection = Database::getConnection();
        // Get a count of how many watchdog entries already exist.
        $count = $connection->select('watchdog')
            ->countQuery()
            ->execute()
            ->fetchField();
        $log = [
            'channel' => 'system',
            'message' => 'Log entry added to test the doClearTest clear down.',
            'variables' => [],
            'severity' => RfcLogLevel::NOTICE,
            'link' => NULL,
            'uid' => $this->adminUser
                ->id(),
            'request_uri' => $base_root . \Drupal::request()->getRequestUri(),
            'referer' => \Drupal::request()->server
                ->get('HTTP_REFERER'),
            'ip' => '127.0.0.1',
            'timestamp' => REQUEST_TIME,
        ];
        // Add a watchdog entry.
        $this->container
            ->get('logger.dblog')
            ->log($log['severity'], $log['message'], $log);
        // Make sure the table count has actually been incremented.
        $this->assertEqual($count + 1, (int) $connection->select('watchdog')
            ->countQuery()
            ->execute()
            ->fetchField(), new FormattableMarkup('\\Drupal\\dblog\\Logger\\DbLog->log() added an entry to the dblog :count', [
            ':count' => $count,
        ]));
        // Log in the admin user.
        $this->drupalLogin($this->adminUser);
        // Post in order to clear the database table.
        $this->clearLogsEntries();
        // Confirm that the logs should be cleared.
        $this->drupalPostForm(NULL, [], 'Confirm');
        // Count the rows in watchdog that previously related to the deleted user.
        $count = $connection->select('watchdog')
            ->countQuery()
            ->execute()
            ->fetchField();
        $this->assertEqual($count, 0, new FormattableMarkup('DBLog contains :count records after a clear.', [
            ':count' => $count,
        ]));
    }
    
    /**
     * Tests the database log filter functionality at admin/reports/dblog.
     */
    public function testFilter() {
        $this->drupalLogin($this->adminUser);
        // Clear the log to ensure that only generated entries will be found.
        Database::getConnection()->delete('watchdog')
            ->execute();
        // Generate 9 random watchdog entries.
        $type_names = [];
        $types = [];
        for ($i = 0; $i < 3; $i++) {
            $type_names[] = $type_name = $this->randomMachineName();
            $severity = RfcLogLevel::EMERGENCY;
            for ($j = 0; $j < 3; $j++) {
                $types[] = $type = [
                    'count' => $j + 1,
                    'type' => $type_name,
                    'severity' => $severity++,
                ];
                $this->generateLogEntries($type['count'], [
                    'channel' => $type['type'],
                    'severity' => $type['severity'],
                ]);
            }
        }
        // View the database log page.
        $this->drupalGet('admin/reports/dblog');
        // Confirm that all the entries are displayed.
        $count = $this->getTypeCount($types);
        foreach ($types as $key => $type) {
            $this->assertEqual($count[$key], $type['count'], 'Count matched');
        }
        // Filter by each type and confirm that entries with various severities are
        // displayed.
        foreach ($type_names as $type_name) {
            $this->filterLogsEntries($type_name);
            // Count the number of entries of this type.
            $type_count = 0;
            foreach ($types as $type) {
                if ($type['type'] == $type_name) {
                    $type_count += $type['count'];
                }
            }
            $count = $this->getTypeCount($types);
            $this->assertEqual(array_sum($count), $type_count, 'Count matched');
        }
        // Set the filter to match each of the two filter-type attributes and
        // confirm the correct number of entries are displayed.
        foreach ($types as $type) {
            $this->filterLogsEntries($type['type'], $type['severity']);
            $count = $this->getTypeCount($types);
            $this->assertEqual(array_sum($count), $type['count'], 'Count matched');
        }
        $this->drupalGet('admin/reports/dblog', [
            'query' => [
                'order' => 'Type',
            ],
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertText(t('Operations'), 'Operations text found');
        // Clear all logs and make sure the confirmation message is found.
        $this->clearLogsEntries();
        // Confirm that the logs should be cleared.
        $this->drupalPostForm(NULL, [], 'Confirm');
        $this->assertText(t('Database log cleared.'), 'Confirmation message found');
    }
    
    /**
     * Gets the database log event information from the browser page.
     *
     * @return array
     *   List of log events where each event is an array with following keys:
     *   - severity: (int) A database log severity constant.
     *   - type: (string) The type of database log event.
     *   - message: (string) The message for this database log event.
     *   - user: (string) The user associated with this database log event.
     */
    protected function getLogEntries() {
        $entries = [];
        if ($table = $this->getLogsEntriesTable()) {
            foreach ($table as $row) {
                $cells = $row->findAll('css', 'td');
                $entries[] = [
                    'severity' => $this->getSeverityConstant($row->getAttribute('class')),
                    'type' => $cells[1]->getText(),
                    'message' => $cells[3]->getText(),
                    'user' => $cells[4]->getText(),
                ];
            }
        }
        return $entries;
    }
    
    /**
     * Find the Logs table in the DOM.
     *
     * @return \SimpleXMLElement[]
     *   The return value of a xpath search.
     */
    protected function getLogsEntriesTable() {
        return $this->xpath('.//table[@id="admin-dblog"]/tbody/tr');
    }
    
    /**
     * Gets the count of database log entries by database log event type.
     *
     * @param array $types
     *   The type information to compare against.
     *
     * @return array
     *   The count of each type keyed by the key of the $types array.
     */
    protected function getTypeCount(array $types) {
        $entries = $this->getLogEntries();
        $count = array_fill(0, count($types), 0);
        foreach ($entries as $entry) {
            foreach ($types as $key => $type) {
                if ($entry['type'] == $type['type'] && $entry['severity'] == $type['severity']) {
                    $count[$key]++;
                    break;
                }
            }
        }
        return $count;
    }
    
    /**
     * Gets the watchdog severity constant corresponding to the CSS class.
     *
     * @param string $class
     *   CSS class attribute.
     *
     * @return int|null
     *   The watchdog severity constant or NULL if not found.
     */
    protected function getSeverityConstant($class) {
        $map = array_flip(DbLogController::getLogLevelClassMap());
        // Find the class that contains the severity.
        $classes = explode(' ', $class);
        foreach ($classes as $class) {
            if (isset($map[$class])) {
                return $map[$class];
            }
        }
        return NULL;
    }
    
    /**
     * Confirms that a log message appears on the database log overview screen.
     *
     * This function should only be used for the admin/reports/dblog page, because
     * it checks for the message link text truncated to 56 characters. Other log
     * pages have no detail links so they contain the full message text.
     *
     * @param string $log_message
     *   The database log message to check.
     * @param string $message
     *   The message to pass to simpletest.
     */
    protected function assertLogMessage($log_message, $message) {
        $message_text = Unicode::truncate(Html::decodeEntities(strip_tags($log_message)), 56, TRUE, TRUE);
        $this->assertSession()
            ->linkExists($message_text, 0, $message);
    }
    
    /**
     * Tests that the details page displays correctly for a temporary user.
     */
    public function testTemporaryUser() {
        // Create a temporary user.
        $tempuser = $this->drupalCreateUser();
        $tempuser_uid = $tempuser->id();
        // Log in as the admin user.
        $this->drupalLogin($this->adminUser);
        // Generate a single watchdog entry.
        $this->generateLogEntries(1, [
            'user' => $tempuser,
            'uid' => $tempuser_uid,
        ]);
        $query = Database::getConnection()->select('watchdog');
        $query->addExpression('MAX(wid)');
        $wid = $query->execute()
            ->fetchField();
        // Check if the full message displays on the details page.
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $this->assertText('Dblog test log message');
        // Delete the user.
        $tempuser->delete();
        $this->drupalGet('user/' . $tempuser_uid);
        $this->assertSession()
            ->statusCodeEquals(404);
        // Check if the full message displays on the details page.
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $this->assertText('Dblog test log message');
    }
    
    /**
     * Make sure HTML tags are filtered out in the log overview links.
     */
    public function testOverviewLinks() {
        $this->drupalLogin($this->adminUser);
        $this->generateLogEntries(1, [
            'message' => "&lt;script&gt;alert('foo');&lt;/script&gt;<strong>Lorem</strong> ipsum dolor sit amet, consectetur adipiscing & elit.",
        ]);
        $this->drupalGet('admin/reports/dblog');
        $this->assertSession()
            ->statusCodeEquals(200);
        // Make sure HTML tags are filtered out.
        $this->assertRaw('title="alert(&#039;foo&#039;);Lorem');
        $this->assertNoRaw("<script>alert('foo');</script>");
        // Make sure HTML tags are filtered out in admin/reports/dblog/event/ too.
        $this->generateLogEntries(1, [
            'message' => "<script>alert('foo');</script> <strong>Lorem ipsum</strong>",
        ]);
        $query = Database::getConnection()->select('watchdog');
        $query->addExpression('MAX(wid)');
        $wid = $query->execute()
            ->fetchField();
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $this->assertNoRaw("<script>alert('foo');</script>");
        $this->assertRaw("alert('foo'); <strong>Lorem ipsum</strong>");
    }
    
    /**
     * Test sorting for entries with the same timestamp.
     */
    public function testSameTimestampEntries() {
        $this->drupalLogin($this->adminUser);
        $this->generateLogEntries(1, [
            'timestamp' => 1498062000,
            'type' => 'same_time',
            'message' => 'First',
        ]);
        $this->generateLogEntries(1, [
            'timestamp' => 1498062000,
            'type' => 'same_time',
            'message' => 'Second',
        ]);
        $this->generateLogEntries(1, [
            'timestamp' => 1498062000,
            'type' => 'same_time',
            'message' => 'Third',
        ]);
        $this->drupalGet('admin/reports/dblog');
        $entries = $this->getLogEntries();
        $this->assertEquals($entries[0]['message'], 'Third Entry #0');
        $this->assertEquals($entries[1]['message'], 'Second Entry #0');
        $this->assertEquals($entries[2]['message'], 'First Entry #0');
    }
    
    /**
     * Tests that the details page displays correctly backtrace.
     */
    public function testBacktrace() {
        $this->drupalLogin($this->adminUser);
        $this->drupalGet('/error-test/generate-warnings');
        $query = Database::getConnection()->select('watchdog');
        $query->addExpression('MAX(wid)');
        $wid = $query->execute()
            ->fetchField();
        $this->drupalGet('admin/reports/dblog/event/' . $wid);
        $error_user_notice = [
            '%type' => 'User warning',
            '@message' => 'Drupal & awesome',
            '%function' => ErrorTestController::class . '->generateWarnings()',
            '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
        ];
        // Check if the full message displays on the details page and backtrace is a
        // pre-formatted text.
        $message = new FormattableMarkup('%type: @message in %function (line', $error_user_notice);
        $this->assertRaw($message);
        $this->assertRaw('<pre class="backtrace">');
    }

}