Club Drupal

<?php

/**

 * @file

 * Used to aggregate syndicated content (RSS, RDF, and Atom).

 */

/**

 * Denotes that a feed's items should never expire.

 */

define('AGGREGATOR_CLEAR_NEVER', 0);

/**

 * Implements hook_help().

 */

function aggregator_help($path, $arg) {

  switch ($path) {

    case 'admin/help#aggregator':

      $output = '';

      $output .= '<h3>' . t('About') . '</h3>';

      $output .= '<p>' . t('The Aggregator module is an on-site syndicator and news reader that gathers and displays fresh content from RSS-, RDF-, and Atom-based feeds made available across the web. Thousands of sites (particularly news sites and blogs) publish their latest headlines in feeds, using a number of standardized XML-based formats. For more information, see the online handbook entry for <a href="@aggregator-module">Aggregator module</a>.', array('@aggregator-module' => 'http://drupal.org/documentation/modules/aggregator', '@aggregator' => url('aggregator'))) . '</p>';

      $output .= '<h3>' . t('Uses') . '</h3>';

      $output .= '<dl>';

      $output .= '<dt>' . t('Viewing feeds') . '</dt>';

      $output .= '<dd>' . t('Feeds contain published content, and may be grouped in categories, generally by topic. Users view feed content in the <a href="@aggregator">main aggregator display</a>, or by <a href="@aggregator-sources">their source</a> (usually via an RSS feed reader). The most recent content in a feed or category can be displayed as a block through the <a href="@admin-block">Blocks administration page</a>.', array('@aggregator' => url('aggregator'), '@aggregator-sources' => url('aggregator/sources'), '@admin-block' => url('admin/structure/block'))) . '</a></dd>';

      $output .= '<dt>' . t('Adding, editing, and deleting feeds') . '</dt>';

      $output .= '<dd>' . t('Administrators can add, edit, and delete feeds, and choose how often to check each feed for newly updated items on the <a href="@feededit">Feed aggregator administration page</a>.', array('@feededit' => url('admin/config/services/aggregator'))) . '</dd>';

      $output .= '<dt>' . t('OPML integration') . '</dt>';

      $output .= '<dd>' . t('A <a href="@aggregator-opml">machine-readable OPML file</a> of all feeds is available. OPML is an XML-based file format used to share outline-structured information such as a list of RSS feeds. Feeds can also be <a href="@import-opml">imported via an OPML file</a>.', array('@aggregator-opml' => url('aggregator/opml'), '@import-opml' => url('admin/config/services/aggregator'))) . '</dd>';

      $output .= '<dt>' . t('Configuring cron') . '</dt>';

      $output .= '<dd>' . t('A correctly configured <a href="@cron">cron maintenance task</a> is required to update feeds automatically.', array('@cron' => 'http://drupal.org/cron')) . '</dd>';

      $output .= '</dl>';

      return $output;

    case 'admin/config/services/aggregator':

      $output = '<p>' . t('Thousands of sites (particularly news sites and blogs) publish their latest headlines and posts in feeds, using a number of standardized XML-based formats. Formats supported by the aggregator include <a href="@rss">RSS</a>, <a href="@rdf">RDF</a>, and <a href="@atom">Atom</a>.', array('@rss' => 'http://cyber.law.harvard.edu/rss/', '@rdf' => 'http://www.w3.org/RDF/', '@atom' => 'http://www.atomenabled.org')) . '</p>';

      $output .= '<p>' . t('Current feeds are listed below, and <a href="@addfeed">new feeds may be added</a>. For each feed or feed category, the <em>latest items</em> block may be enabled at the <a href="@block">blocks administration page</a>.', array('@addfeed' => url('admin/config/services/aggregator/add/feed'), '@block' => url('admin/structure/block'))) . '</p>';

      return $output;

    case 'admin/config/services/aggregator/add/feed':

      return '<p>' . t('Add a feed in RSS, RDF or Atom format. A feed may only have one entry.') . '</p>';

    case 'admin/config/services/aggregator/add/category':

      return '<p>' . t('Categories allow feed items from different feeds to be grouped together. For example, several sport-related feeds may belong to a category named <em>Sports</em>. Feed items may be grouped automatically (by selecting a category when creating or editing a feed) or manually (via the <em>Categorize</em> page available from feed item listings). Each category provides its own feed page and block.') . '</p>';

    case 'admin/config/services/aggregator/add/opml':

      return '<p>' . t('<acronym title="Outline Processor Markup Language">OPML</acronym> is an XML format used to exchange multiple feeds between aggregators. A single OPML document may contain a collection of many feeds. Drupal can parse such a file and import all feeds at once, saving you the effort of adding them manually. You may either upload a local file from your computer or enter a URL where Drupal can download it.') . '</p>';

  }

}

/**

 * Implements hook_theme().

 */

function aggregator_theme() {

  return array(

    'aggregator_wrapper' => array(

      'variables' => array('content' => NULL),

      'file' => 'aggregator.pages.inc',

      'template' => 'aggregator-wrapper',

    ),

    'aggregator_categorize_items' => array(

      'render element' => 'form',

      'file' => 'aggregator.pages.inc',

    ),

    'aggregator_feed_source' => array(

      'variables' => array('feed' => NULL),

      'file' => 'aggregator.pages.inc',

      'template' => 'aggregator-feed-source',

    ),

    'aggregator_block_item' => array(

      'variables' => array('item' => NULL, 'feed' => 0),

    ),

    'aggregator_summary_items' => array(

      'variables' => array('summary_items' => NULL, 'source' => NULL),

      'file' => 'aggregator.pages.inc',

      'template' => 'aggregator-summary-items',

    ),

    'aggregator_summary_item' => array(

      'variables' => array('item' => NULL),

      'file' => 'aggregator.pages.inc',

      'template' => 'aggregator-summary-item',

    ),

    'aggregator_item' => array(

      'variables' => array('item' => NULL),

      'file' => 'aggregator.pages.inc',

      'template' => 'aggregator-item',

    ),

    'aggregator_page_opml' => array(

      'variables' => array('feeds' => NULL),

      'file' => 'aggregator.pages.inc',

    ),

    'aggregator_page_rss' => array(

      'variables' => array('feeds' => NULL, 'category' => NULL),

      'file' => 'aggregator.pages.inc',

    ),

  );

}

/**

 * Implements hook_menu().

 */

function aggregator_menu() {

  $items['admin/config/services/aggregator'] = array(

    'title' => 'Feed aggregator',

    'description' => "Configure which content your site aggregates from other sites, how often it polls them, and how they're categorized.",

    'page callback' => 'aggregator_admin_overview',

    'access arguments' => array('administer news feeds'),

    'weight' => 10,

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/add/feed'] = array(

    'title' => 'Add feed',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_form_feed'),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_ACTION,

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/add/category'] = array(

    'title' => 'Add category',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_form_category'),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_ACTION,

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/add/opml'] = array(

    'title' => 'Import OPML',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_form_opml'),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_ACTION,

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/remove/%aggregator_feed'] = array(

    'title' => 'Remove items',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_admin_remove_feed', 5),

    'access arguments' => array('administer news feeds'),

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/update/%aggregator_feed'] = array(

    'title' => 'Update items',

    'page callback' => 'aggregator_admin_refresh_feed',

    'page arguments' => array(5),

    'access arguments' => array('administer news feeds'),

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/list'] = array(

    'title' => 'List',

    'type' => MENU_DEFAULT_LOCAL_TASK,

    'weight' => -10,

  );

  $items['admin/config/services/aggregator/settings'] = array(

    'title' => 'Settings',

    'description' => 'Configure the behavior of the feed aggregator, including when to discard feed items and how to present feed items and categories.',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_admin_form'),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_TASK,

    'file' => 'aggregator.admin.inc',

  );

  $items['aggregator'] = array(

    'title' => 'Feed aggregator',

    'page callback' => 'aggregator_page_last',

    'access arguments' => array('access news feeds'),

    'weight' => 5,

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/sources'] = array(

    'title' => 'Sources',

    'page callback' => 'aggregator_page_sources',

    'access arguments' => array('access news feeds'),

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/categories'] = array(

    'title' => 'Categories',

    'page callback' => 'aggregator_page_categories',

    'access callback' => '_aggregator_has_categories',

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/rss'] = array(

    'title' => 'RSS feed',

    'page callback' => 'aggregator_page_rss',

    'access arguments' => array('access news feeds'),

    'type' => MENU_CALLBACK,

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/opml'] = array(

    'title' => 'OPML feed',

    'page callback' => 'aggregator_page_opml',

    'access arguments' => array('access news feeds'),

    'type' => MENU_CALLBACK,

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/categories/%aggregator_category'] = array(

    'title callback' => '_aggregator_category_title',

    'title arguments' => array(2),

    'page callback' => 'aggregator_page_category',

    'page arguments' => array(2),

    'access arguments' => array('access news feeds'),

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/categories/%aggregator_category/view'] = array(

    'title' => 'View',

    'type' => MENU_DEFAULT_LOCAL_TASK,

    'weight' => -10,

  );

  $items['aggregator/categories/%aggregator_category/categorize'] = array(

    'title' => 'Categorize',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_page_category_form', 2),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_TASK,

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/categories/%aggregator_category/configure'] = array(

    'title' => 'Configure',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_form_category', 2),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_TASK,

    'weight' => 1,

    'file' => 'aggregator.admin.inc',

  );

  $items['aggregator/sources/%aggregator_feed'] = array(

    'page callback' => 'aggregator_page_source',

    'page arguments' => array(2),

    'access arguments' => array('access news feeds'),

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/sources/%aggregator_feed/view'] = array(

    'title' => 'View',

    'type' => MENU_DEFAULT_LOCAL_TASK,

    'weight' => -10,

  );

  $items['aggregator/sources/%aggregator_feed/categorize'] = array(

    'title' => 'Categorize',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_page_source_form', 2),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_TASK,

    'file' => 'aggregator.pages.inc',

  );

  $items['aggregator/sources/%aggregator_feed/configure'] = array(

    'title' => 'Configure',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_form_feed', 2),

    'access arguments' => array('administer news feeds'),

    'type' => MENU_LOCAL_TASK,

    'weight' => 1,

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/edit/feed/%aggregator_feed'] = array(

    'title' => 'Edit feed',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_form_feed', 6),

    'access arguments' => array('administer news feeds'),

    'file' => 'aggregator.admin.inc',

  );

  $items['admin/config/services/aggregator/edit/category/%aggregator_category'] = array(

    'title' => 'Edit category',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('aggregator_form_category', 6),

    'access arguments' => array('administer news feeds'),

    'file' => 'aggregator.admin.inc',

  );

  return $items;

}

/**

 * Title callback: Returns a title for aggregator category pages.

 *

 * @param $category

 *   An aggregator category.

 *

 * @return

 *   A string with the aggregator category title.

 */

function _aggregator_category_title($category) {

  return $category['title'];

}

/**

 * Determines whether there are any aggregator categories.

 *

 * @return

 *   TRUE if there is at least one category and the user has access to them;

 *   FALSE otherwise.

 */

function _aggregator_has_categories() {

  return user_access('access news feeds') && (bool) db_query_range('SELECT 1 FROM {aggregator_category}', 0, 1)->fetchField();

}

/**

 * Implements hook_permission().

 */

function aggregator_permission() {

  return array(

    'administer news feeds' => array(

      'title' => t('Administer news feeds'),

    ),

    'access news feeds' => array(

      'title' => t('View news feeds'),

    ),

  );

}

/**

 * Implements hook_cron().

 *

 * Queues news feeds for updates once their refresh interval has elapsed.

 */

function aggregator_cron() {

  $result = db_query('SELECT * FROM {aggregator_feed} WHERE queued = 0 AND checked + refresh < :time AND refresh <> :never', array(

    ':time' => REQUEST_TIME,

    ':never' => AGGREGATOR_CLEAR_NEVER

  ));

  $queue = DrupalQueue::get('aggregator_feeds');

  foreach ($result as $feed) {

    if ($queue->createItem($feed)) {

      // Add timestamp to avoid queueing item more than once.

      db_update('aggregator_feed')

        ->fields(array('queued' => REQUEST_TIME))

        ->condition('fid', $feed->fid)

        ->execute();

    }

  }

  // Remove queued timestamp after 6 hours assuming the update has failed.

  db_update('aggregator_feed')

    ->fields(array('queued' => 0))

    ->condition('queued', REQUEST_TIME - (3600 * 6), '<')

    ->execute();

}

/**

 * Implements hook_cron_queue_info().

 */

function aggregator_cron_queue_info() {

  $queues['aggregator_feeds'] = array(

    'worker callback' => 'aggregator_refresh',

    'time' => 60,

  );

  return $queues;

}

/**

 * Implements hook_block_info().

 */

function aggregator_block_info() {

  $blocks = array();

  $result = db_query('SELECT cid, title FROM {aggregator_category} ORDER BY title');

  foreach ($result as $category) {

    $blocks['category-' . $category->cid]['info'] = t('!title category latest items', array('!title' => $category->title));

  }

  $result = db_query('SELECT fid, title FROM {aggregator_feed} WHERE block <> 0 ORDER BY fid');

  foreach ($result as $feed) {

    $blocks['feed-' . $feed->fid]['info'] = t('!title feed latest items', array('!title' => $feed->title));

  }

  return $blocks;

}

/**

 * Implements hook_block_configure().

 */

function aggregator_block_configure($delta = '') {

  list($type, $id) = explode('-', $delta);

  if ($type == 'category') {

    $value = db_query('SELECT block FROM {aggregator_category} WHERE cid = :cid', array(':cid' => $id))->fetchField();

    $form['block'] = array(

      '#type' => 'select',

      '#title' => t('Number of news items in block'),

      '#default_value' => $value,

      '#options' => drupal_map_assoc(range(2, 20)),

    );

    return $form;

  }

}

/**

 * Implements hook_block_save().

 */

function aggregator_block_save($delta = '', $edit = array()) {

  list($type, $id) = explode('-', $delta);

  if ($type == 'category') {

    db_update('aggregator_category')

      ->fields(array('block' => $edit['block']))

      ->condition('cid', $id)

      ->execute();

  }

}

/**

 * Implements hook_block_view().

 *

 * Generates blocks for the latest news items in each category and feed.

 */

function aggregator_block_view($delta = '') {

  if (user_access('access news feeds')) {

    $block = array();

    list($type, $id) = explode('-', $delta);

    $result = FALSE;

    switch ($type) {

      case 'feed':

        if ($feed = db_query('SELECT fid, title, block FROM {aggregator_feed} WHERE block <> 0 AND fid = :fid', array(':fid' => $id))->fetchObject()) {

          $block['subject'] = check_plain($feed->title);

          $result = db_query_range("SELECT * FROM {aggregator_item} WHERE fid = :fid ORDER BY timestamp DESC, iid DESC", 0, $feed->block, array(':fid' => $id));

          $read_more = theme('more_link', array('url' => 'aggregator/sources/' . $feed->fid, 'title' => t("View this feed's recent news.")));

        }

        break;

      case 'category':

        if ($category = db_query('SELECT cid, title, block FROM {aggregator_category} WHERE cid = :cid', array(':cid' => $id))->fetchObject()) {

          $block['subject'] = check_plain($category->title);

          $result = db_query_range('SELECT i.* FROM {aggregator_category_item} ci LEFT JOIN {aggregator_item} i ON ci.iid = i.iid WHERE ci.cid = :cid ORDER BY i.timestamp DESC, i.iid DESC', 0, $category->block, array(':cid' => $category->cid));

          $read_more = theme('more_link', array('url' => 'aggregator/categories/' . $category->cid, 'title' => t("View this category's recent news.")));

        }

        break;

    }

    $items = array();

    if (!empty($result)) {

      foreach ($result as $item) {

        $items[] = theme('aggregator_block_item', array('item' => $item));

      }

    }

    // Only display the block if there are items to show.

    if (count($items) > 0) {

      $block['content'] = theme('item_list', array('items' => $items)) . $read_more;

    }

    return $block;

  }

}

/**

 * Adds/edits/deletes aggregator categories.

 *

 * @param $edit

 *   An associative array describing the category to be added/edited/deleted.

 */

function aggregator_save_category($edit) {

  $link_path = 'aggregator/categories/';

  if (!empty($edit['cid'])) {

    $link_path .= $edit['cid'];

    if (!empty($edit['title'])) {

      db_merge('aggregator_category')

        ->key(array('cid' => $edit['cid']))

        ->fields(array(

          'title' => $edit['title'],

          'description' => $edit['description'],

        ))

        ->execute();

      $op = 'update';

    }

    else {

      db_delete('aggregator_category')

        ->condition('cid', $edit['cid'])

        ->execute();

      // Make sure there is no active block for this category.

      if (module_exists('block')) {

        db_delete('block')

          ->condition('module', 'aggregator')

          ->condition('delta', 'category-' . $edit['cid'])

          ->execute();

      }

      $edit['title'] = '';

      $op = 'delete';

    }

  }

  elseif (!empty($edit['title'])) {

    // A single unique id for bundles and feeds, to use in blocks.

    $link_path .= db_insert('aggregator_category')

      ->fields(array(

        'title' => $edit['title'],

        'description' => $edit['description'],

        'block' => 5,

      ))

      ->execute();

    $op = 'insert';

  }

  if (isset($op)) {

    menu_link_maintain('aggregator', $op, $link_path, $edit['title']);

  }

}

/**

 * Add/edit/delete an aggregator feed.

 *

 * @param $edit

 *   An associative array describing the feed to be added/edited/deleted.

 */

function aggregator_save_feed($edit) {

  if (!empty($edit['fid'])) {

    // An existing feed is being modified, delete the category listings.

    db_delete('aggregator_category_feed')

      ->condition('fid', $edit['fid'])

      ->execute();

  }

  if (!empty($edit['fid']) && !empty($edit['title'])) {

    db_update('aggregator_feed')

      ->condition('fid', $edit['fid'])

      ->fields(array(

        'title' => $edit['title'],

        'url' => $edit['url'],

        'refresh' => $edit['refresh'],

        'block' => $edit['block'],

      ))

      ->execute();

  }

  elseif (!empty($edit['fid'])) {

    $iids = db_query('SELECT iid FROM {aggregator_item} WHERE fid = :fid', array(':fid' => $edit['fid']))->fetchCol();

    if ($iids) {

      db_delete('aggregator_category_item')

        ->condition('iid', $iids, 'IN')

        ->execute();

    }

    db_delete('aggregator_feed')->

      condition('fid', $edit['fid'])

      ->execute();

    db_delete('aggregator_item')

      ->condition('fid', $edit['fid'])

      ->execute();

    // Make sure there is no active block for this feed.

    if (module_exists('block')) {

      db_delete('block')

        ->condition('module', 'aggregator')

        ->condition('delta', 'feed-' . $edit['fid'])

        ->execute();

    }

  }

  elseif (!empty($edit['title'])) {

    $edit['fid'] = db_insert('aggregator_feed')

      ->fields(array(

        'title' => $edit['title'],

        'url' => $edit['url'],

        'refresh' => $edit['refresh'],

        'block' => $edit['block'],

        'link' => '',

        'description' => '',

        'image' => '',

      ))

      ->execute();

  }

  if (!empty($edit['title'])) {

    // The feed is being saved, save the categories as well.

    if (!empty($edit['category'])) {

      foreach ($edit['category'] as $cid => $value) {

        if ($value) {

          db_insert('aggregator_category_feed')

            ->fields(array(

              'fid' => $edit['fid'],

              'cid' => $cid,

            ))

            ->execute();

        }

      }

    }

  }

}

/**

 * Removes all items from a feed.

 *

 * @param $feed

 *   An object describing the feed to be cleared.

 */

function aggregator_remove($feed) {

  _aggregator_get_variables();

  // Call hook_aggregator_remove() on all modules.

  module_invoke_all('aggregator_remove', $feed);

  // Reset feed.

  db_update('aggregator_feed')

    ->condition('fid', $feed->fid)

    ->fields(array(

      'checked' => 0,

      'hash' => '',

      'etag' => '',

      'modified' => 0,

    ))

    ->execute();

}

/**

 * Gets the fetcher, parser, and processors.

 *

 * @return

 *   An array containing the fetcher, parser, and processors.

 */

function _aggregator_get_variables() {

  // Fetch the feed.

  $fetcher = variable_get('aggregator_fetcher', 'aggregator');

  if ($fetcher == 'aggregator') {

    include_once DRUPAL_ROOT . '/' . drupal_get_path('module', 'aggregator') . '/aggregator.fetcher.inc';

  }

  $parser = variable_get('aggregator_parser', 'aggregator');

  if ($parser == 'aggregator') {

    include_once DRUPAL_ROOT . '/' . drupal_get_path('module', 'aggregator') . '/aggregator.parser.inc';

  }

  $processors = variable_get('aggregator_processors', array('aggregator'));

  if (in_array('aggregator', $processors)) {

    include_once DRUPAL_ROOT . '/' . drupal_get_path('module', 'aggregator') . '/aggregator.processor.inc';

  }

  return array($fetcher, $parser, $processors);

}

/**

 * Checks a news feed for new items.

 *

 * @param $feed

 *   An object describing the feed to be refreshed.

 */

function aggregator_refresh($feed) {

  // Store feed URL to track changes.

  $feed_url = $feed->url;

  // Fetch the feed.

  list($fetcher, $parser, $processors) = _aggregator_get_variables();

  $success = module_invoke($fetcher, 'aggregator_fetch', $feed);

  // We store the hash of feed data in the database. When refreshing a

  // feed we compare stored hash and new hash calculated from downloaded

  // data. If both are equal we say that feed is not updated.

  $hash = hash('sha256', $feed->source_string);

  if ($success && ($feed->hash != $hash)) {

    // Parse the feed.

    if (module_invoke($parser, 'aggregator_parse', $feed)) {

      // Update feed with parsed data.

      db_merge('aggregator_feed')

        ->key(array('fid' => $feed->fid))

        ->fields(array(

          'url' => $feed->url,

          'link' => empty($feed->link) ? $feed->url : $feed->link,

          'description' => empty($feed->description) ? '' : $feed->description,

          'image' => empty($feed->image) ? '' : $feed->image,

          'hash' => $hash,

          'etag' => empty($feed->etag) ? '' : $feed->etag,

          'modified' => empty($feed->modified) ? 0 : $feed->modified,

        ))

        ->execute();

      // Log if feed URL has changed.

      if ($feed->url != $feed_url) {

        watchdog('aggregator', 'Updated URL for feed %title to %url.', array('%title' => $feed->title, '%url' => $feed->url));

      }

      watchdog('aggregator', 'There is new syndicated content from %site.', array('%site' => $feed->title));

      drupal_set_message(t('There is new syndicated content from %site.', array('%site' => $feed->title)));

      // If there are items on the feed, let all enabled processors do their work on it.

      if (@count($feed->items)) {

        foreach ($processors as $processor) {

          module_invoke($processor, 'aggregator_process', $feed);

        }

      }

    }

  }

  else {

    drupal_set_message(t('There is no new syndicated content from %site.', array('%site' => $feed->title)));

  }

  // Regardless of successful or not, indicate that this feed has been checked.

  db_update('aggregator_feed')

    ->fields(array('checked' => REQUEST_TIME, 'queued' => 0))

    ->condition('fid', $feed->fid)

    ->execute();

  // Expire old feed items.

  if (function_exists('aggregator_expire')) {

    aggregator_expire($feed);

  }

}

/**

 * Loads an aggregator feed.

 *

 * @param $fid

 *   The feed id.

 *

 * @return

 *   An object describing the feed.

 */

function aggregator_feed_load($fid) {

  $feeds = &drupal_static(__FUNCTION__);

  if (!isset($feeds[$fid])) {

    $feeds[$fid] = db_query('SELECT * FROM {aggregator_feed} WHERE fid = :fid', array(':fid' => $fid))->fetchObject();

  }

  return $feeds[$fid];

}

/**

 * Loads an aggregator category.

 *

 * @param $cid

 *   The category id.

 *

 * @return

 *   An associative array describing the category.

 */

function aggregator_category_load($cid) {

  $categories = &drupal_static(__FUNCTION__);

  if (!isset($categories[$cid])) {

    $categories[$cid] = db_query('SELECT * FROM {aggregator_category} WHERE cid = :cid', array(':cid' => $cid))->fetchAssoc();

  }

  return $categories[$cid];

}

/**

 * Returns HTML for an individual feed item for display in the block.

 *

 * @param $variables

 *   An associative array containing:

 *   - item: The item to be displayed.

 *   - feed: Not used.

 *

 * @ingroup themeable

 */

function theme_aggregator_block_item($variables) {

  // Display the external link to the item.

  return '<a href="' . check_url($variables['item']->link) . '">' . check_plain($variables['item']->title) . "</a>\n";

}

/**

 * Renders the HTML content safely, as allowed.

 *

 * @param $value

 *   The content to be filtered.

 *

 * @return

 *   The filtered content.

 */

function aggregator_filter_xss($value) {

  return filter_xss($value, preg_split('/\s+|<|>/', variable_get('aggregator_allowed_html_tags', '<a> <b> <br> <dd> <dl> <dt> <em> <i> <li> <ol> <p> <strong> <u> <ul>'), -1, PREG_SPLIT_NO_EMPTY));

}

/**

 * Checks and sanitizes the aggregator configuration.

 *

 * Goes through all fetchers, parsers and processors and checks whether they

 * are available. If one is missing, resets to standard configuration.

 *

 * @return

 *   TRUE if this function resets the configuration; FALSE if not.

 */

function aggregator_sanitize_configuration() {

  $reset = FALSE;

  list($fetcher, $parser, $processors) = _aggregator_get_variables();

  if (!module_exists($fetcher)) {

    $reset = TRUE;

  }

  if (!module_exists($parser)) {

    $reset = TRUE;

  }

  foreach ($processors as $processor) {

    if (!module_exists($processor)) {

      $reset = TRUE;

      break;

    }

  }

  if ($reset) {

    variable_del('aggregator_fetcher');

    variable_del('aggregator_parser');

    variable_del('aggregator_processors');

    return TRUE;

  }

  return FALSE;

}

/**

 * Helper function for drupal_map_assoc.

 *

 * @param $count

 *   Items count.

 *

 * @return

 *   A string that is plural-formatted as "@count items".

 */

function _aggregator_items($count) {

  return format_plural($count, '1 item', '@count items');

}