<?php

/**

 * @file

 * Administrative page callbacks for the Database Logging module.

 */

/**

 * Page callback: Displays a listing of database log messages.

 *

 * Messages are truncated at 56 chars. Full-length messages can be viewed on the

 * message details page.

 *

 * @see dblog_clear_log_form()

 * @see dblog_event()

 * @see dblog_filter_form()

 * @see dblog_menu()

 *

 * @ingroup logging_severity_levels

 */

function dblog_overview() {

  $filter = dblog_build_filter_query();

  $rows = array();

  $classes = array(

    WATCHDOG_DEBUG     => 'dblog-debug',

    WATCHDOG_INFO      => 'dblog-info',

    WATCHDOG_NOTICE    => 'dblog-notice',

    WATCHDOG_WARNING   => 'dblog-warning',

    WATCHDOG_ERROR     => 'dblog-error',

    WATCHDOG_CRITICAL  => 'dblog-critical',

    WATCHDOG_ALERT     => 'dblog-alert',

    WATCHDOG_EMERGENCY => 'dblog-emerg',

  );

  $build['dblog_filter_form'] = drupal_get_form('dblog_filter_form');

  $build['dblog_clear_log_form'] = drupal_get_form('dblog_clear_log_form');

  $header = array(

    '', // Icon column.

    array('data' => t('Type'), 'field' => 'w.type'),

    array('data' => t('Date'), 'field' => 'w.wid', 'sort' => 'desc'),

    t('Message'),

    array('data' => t('User'), 'field' => 'u.name'),

    array('data' => t('Operations')),

  );

  $query = db_select('watchdog', 'w')->extend('PagerDefault')->extend('TableSort');

  $query->leftJoin('users', 'u', 'w.uid = u.uid');

  $query

    ->fields('w', array('wid', 'uid', 'severity', 'type', 'timestamp', 'message', 'variables', 'link'))

    ->addField('u', 'name');

  if (!empty($filter['where'])) {

    $query->where($filter['where'], $filter['args']);

  }

  $result = $query

    ->limit(50)

    ->orderByHeader($header)

    ->execute();

  foreach ($result as $dblog) {

    $rows[] = array('data' =>

      array(

        // Cells

        array('class' => 'icon'),

        t($dblog->type),

        format_date($dblog->timestamp, 'short'),

        theme('dblog_message', array('event' => $dblog, 'link' => TRUE)),

        theme('username', array('account' => $dblog)),

        filter_xss($dblog->link),

      ),

      // Attributes for tr

      'class' => array(drupal_html_class('dblog-' . $dblog->type), $classes[$dblog->severity]),

    );

  }

  $build['dblog_table'] = array(

    '#theme' => 'table',

    '#header' => $header,

    '#rows' => $rows,

    '#attributes' => array('id' => 'admin-dblog'),

    '#empty' => t('No log messages available.'),

  );

  $build['dblog_pager'] = array('#theme' => 'pager');

  return $build;

}

/**

 * Page callback: Shows the most frequent log messages of a given event type.

 *

 * Messages are not truncated on this page because events detailed herein do not

 * have links to a detailed view.

 *

 * @param string $type

 *   Type of database log events to display (e.g., 'search').

 *

 * @return array

 *   A build array in the format expected by drupal_render().

 *

 * @see dblog_menu()

 */

function dblog_top($type) {

  $header = array(

    array('data' => t('Count'), 'field' => 'count', 'sort' => 'desc'),

    array('data' => t('Message'), 'field' => 'message')

  );

  $count_query = db_select('watchdog');

  $count_query->addExpression('COUNT(DISTINCT(message))');

  $count_query->condition('type', $type);

  $query = db_select('watchdog', 'w')->extend('PagerDefault')->extend('TableSort');

  $query->addExpression('COUNT(wid)', 'count');

  $query = $query

    ->fields('w', array('message', 'variables'))

    ->condition('w.type', $type)

    ->groupBy('message')

    ->groupBy('variables')

    ->limit(30)

    ->orderByHeader($header);

  $query->setCountQuery($count_query);

  $result = $query->execute();

  $rows = array();

  foreach ($result as $dblog) {

    $rows[] = array($dblog->count, theme('dblog_message', array('event' => $dblog)));

  }

  $build['dblog_top_table']  = array(

    '#theme' => 'table',

    '#header' => $header,

    '#rows' => $rows,

    '#empty' => t('No log messages available.'),

  );

  $build['dblog_top_pager'] = array('#theme' => 'pager');

  return $build;

}

/**

 * Page callback: Displays details about a specific database log message.

 *

 * @param int $id

 *   Unique ID of the database log message.

 *

 * @return array|string

 *   If the ID is located in the Database Logging table, a build array in the

 *   format expected by drupal_render(); otherwise, an empty string.

 *

 * @see dblog_menu()

 */

function dblog_event($id) {

  $severity = watchdog_severity_levels();

  $result = db_query('SELECT w.*, u.name, u.uid FROM {watchdog} w INNER JOIN {users} u ON w.uid = u.uid WHERE w.wid = :id', array(':id' => $id))->fetchObject();

  if ($dblog = $result) {

    $rows = array(

      array(

        array('data' => t('Type'), 'header' => TRUE),

        t($dblog->type),

      ),

      array(

        array('data' => t('Date'), 'header' => TRUE),

        format_date($dblog->timestamp, 'long'),

      ),

      array(

        array('data' => t('User'), 'header' => TRUE),

        theme('username', array('account' => $dblog)),

      ),

      array(

        array('data' => t('Location'), 'header' => TRUE),

        l($dblog->location, $dblog->location),

      ),

      array(

        array('data' => t('Referrer'), 'header' => TRUE),

        l($dblog->referer, $dblog->referer),

      ),

      array(

        array('data' => t('Message'), 'header' => TRUE),

        theme('dblog_message', array('event' => $dblog)),

      ),

      array(

        array('data' => t('Severity'), 'header' => TRUE),

        $severity[$dblog->severity],

      ),

      array(

        array('data' => t('Hostname'), 'header' => TRUE),

        check_plain($dblog->hostname),

      ),

      array(

        array('data' => t('Operations'), 'header' => TRUE),

        $dblog->link,

      ),

    );

    $build['dblog_table'] = array(

      '#theme' => 'table',

      '#rows' => $rows,

      '#attributes' => array('class' => array('dblog-event')),

    );

    return $build;

  }

  else {

    return '';

  }

}

/**

 * Builds a query for database log administration filters based on session.

 *

 * @return array

 *   An associative array with keys 'where' and 'args'.

 */

function dblog_build_filter_query() {

  if (empty($_SESSION['dblog_overview_filter'])) {

    return;

  }

  $filters = dblog_filters();

  // Build query

  $where = $args = array();

  foreach ($_SESSION['dblog_overview_filter'] as $key => $filter) {

    $filter_where = array();

    foreach ($filter as $value) {

      $filter_where[] = $filters[$key]['where'];

      $args[] = $value;

    }

    if (!empty($filter_where)) {

      $where[] = '(' . implode(' OR ', $filter_where) . ')';

    }

  }

  $where = !empty($where) ? implode(' AND ', $where) : '';

  return array(

    'where' => $where,

    'args' => $args,

  );

}

/**

 * Creates a list of database log administration filters that can be applied.

 *

 * @return array

 *   Associative array of filters. The top-level keys are used as the form

 *   element names for the filters, and the values are arrays with the following

 *   elements:

 *   - title: Title of the filter.

 *   - where: The filter condition.

 *   - options: Array of options for the select list for the filter.

 */

function dblog_filters() {

  $filters = array();

  foreach (_dblog_get_message_types() as $type) {

    $types[$type] = t($type);

  }

  if (!empty($types)) {

    $filters['type'] = array(

      'title' => t('Type'),

      'where' => "w.type = ?",

      'options' => $types,

    );

  }

  $filters['severity'] = array(

    'title' => t('Severity'),

    'where' => 'w.severity = ?',

    'options' => watchdog_severity_levels(),

  );

  return $filters;

}

/**

 * Returns HTML for a log message.

 *

 * @param array $variables

 *   An associative array containing:

 *   - event: An object with at least the message and variables properties.

 *   - link: (optional) Format message as link, event->wid is required.

 *

 * @ingroup themeable

 */

function theme_dblog_message($variables) {

  $output = '';

  $event = $variables['event'];

  // Check for required properties.

  if (isset($event->message) && isset($event->variables)) {

    // Messages without variables or user specified text.

    if ($event->variables === 'N;') {

      $output = $event->message;

    }

    // Message to translate with injected variables.

    else {

      $output = t($event->message, unserialize($event->variables));

    }

    // If the output is expected to be a link, strip all the tags and

    // special characters by using filter_xss() without any allowed tags.

    // If not, use filter_xss_admin() to allow some tags.

    if ($variables['link'] && isset($event->wid)) {

      // Truncate message to 56 chars after stripping all the tags.

      $output = truncate_utf8(filter_xss($output, array()), 56, TRUE, TRUE);

      $output = l($output, 'admin/reports/event/' . $event->wid, array('html' => TRUE));

    }

    else {

      // Prevent XSS in log detail pages.

      $output = filter_xss_admin($output);

    }

  }

  return $output;

}

/**

 * Form constructor for the database logging filter form.

 *

 * @see dblog_filter_form_validate()

 * @see dblog_filter_form_submit()

 * @see dblog_overview()

 *

 * @ingroup forms

 */

function dblog_filter_form($form) {

  $filters = dblog_filters();

  $form['filters'] = array(

    '#type' => 'fieldset',

    '#title' => t('Filter log messages'),

    '#collapsible' => TRUE,

    '#collapsed' => empty($_SESSION['dblog_overview_filter']),

  );

  foreach ($filters as $key => $filter) {

    $form['filters']['status'][$key] = array(

      '#title' => $filter['title'],

      '#type' => 'select',

      '#multiple' => TRUE,

      '#size' => 8,

      '#options' => $filter['options'],

    );

    if (!empty($_SESSION['dblog_overview_filter'][$key])) {

      $form['filters']['status'][$key]['#default_value'] = $_SESSION['dblog_overview_filter'][$key];

    }

  }

  $form['filters']['actions'] = array(

    '#type' => 'actions',

    '#attributes' => array('class' => array('container-inline')),

  );

  $form['filters']['actions']['submit'] = array(

    '#type' => 'submit',

    '#value' => t('Filter'),

  );

  if (!empty($_SESSION['dblog_overview_filter'])) {

    $form['filters']['actions']['reset'] = array(

      '#type' => 'submit',

      '#value' => t('Reset')

    );

  }

  return $form;

}

/**

 * Form validation handler for dblog_filter_form().

 *

 * @see dblog_filter_form_submit()

 */

function dblog_filter_form_validate($form, &$form_state) {

  if ($form_state['values']['op'] == t('Filter') && empty($form_state['values']['type']) && empty($form_state['values']['severity'])) {

    form_set_error('type', t('You must select something to filter by.'));

  }

}

/**

 * Form submission handler for dblog_filter_form().

 *

 * @see dblog_filter_form_validate()

 */

function dblog_filter_form_submit($form, &$form_state) {

  $op = $form_state['values']['op'];

  $filters = dblog_filters();

  switch ($op) {

    case t('Filter'):

      foreach ($filters as $name => $filter) {

        if (isset($form_state['values'][$name])) {

          $_SESSION['dblog_overview_filter'][$name] = $form_state['values'][$name];

        }

      }

      break;

    case t('Reset'):

      $_SESSION['dblog_overview_filter'] = array();

      break;

  }

  return 'admin/reports/dblog';

}

/**

 * Form constructor for the form that clears out the log.

 *

 * @see dblog_clear_log_submit()

 * @ingroup forms

 */

function dblog_clear_log_form($form) {

  $form['dblog_clear'] = array(

    '#type' => 'fieldset',

    '#title' => t('Clear log messages'),

    '#description' => t('This will permanently remove the log messages from the database.'),

    '#collapsible' => TRUE,

    '#collapsed' => TRUE,

  );

  $form['dblog_clear']['clear'] = array(

    '#type' => 'submit',

    '#value' => t('Clear log messages'),

    '#submit' => array('dblog_clear_log_submit'),

  );

  return $form;

}