[Summary view] [Print] [Text view]

   1  <?php
   2  
   3  /**
   4   * @file
   5   * Used to aggregate syndicated content (RSS, RDF, and Atom).
   6   */
   7  
   8  /**
   9   * Implementation of hook_help().
  10   */
  11  function aggregator_help($path, $arg) {
  12    switch ($path) {
  13      case 'admin/help#aggregator':
  14        $output = '<p>'. t('The aggregator is a powerful on-site syndicator and news reader that gathers 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 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>';
  15        $output .= '<p>'. t('Feeds contain feed items, or individual posts published by the site providing the feed. Feeds may be grouped in categories, generally by topic. Users view feed items in the <a href="@aggregator">main aggregator display</a> or by <a href="@aggregator-sources">their source</a>. Administrators can <a href="@feededit">add, edit and delete feeds</a> and choose how often to check each feed for newly updated items. The most recent items in either a feed or category can be displayed as a block through the <a href="@admin-block">blocks administration page</a>. A <a href="@aggregator-opml">machine-readable OPML file</a> of all feeds is available. A correctly configured <a href="@cron">cron maintenance task</a> is required to update feeds automatically.', array('@aggregator' => url('aggregator'), '@aggregator-sources' => url('aggregator/sources'), '@feededit' => url('admin/content/aggregator'), '@admin-block' => url('admin/build/block'), '@aggregator-opml' => url('aggregator/opml'), '@cron' => url('admin/reports/status'))) .'</p>';
  16        $output .= '<p>'. t('For more information, see the online handbook entry for <a href="@aggregator">Aggregator module</a>.', array('@aggregator' => 'http://drupal.org/handbook/modules/aggregator/')) .'</p>';
  17        return $output;
  18      case 'admin/content/aggregator':
  19        $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>';
  20        $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/content/aggregator/add/feed'), '@block' => url('admin/build/block'))) .'</p>';
  21        return $output;
  22      case 'admin/content/aggregator/add/feed':
  23        return '<p>'. t('Add a feed in RSS, RDF or Atom format. A feed may only have one entry.') .'</p>';
  24      case 'admin/content/aggregator/add/category':
  25        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>';
  26    }
  27  }
  28  
  29  /**
  30   * Implementation of hook_theme()
  31   */
  32  function aggregator_theme() {
  33    return array(
  34      'aggregator_wrapper' => array(
  35        'arguments' => array('content' => NULL),
  36        'file' => 'aggregator.pages.inc',
  37        'template' => 'aggregator-wrapper',
  38      ),
  39      'aggregator_categorize_items' => array(
  40        'arguments' => array('form' => NULL),
  41        'file' => 'aggregator.pages.inc',
  42      ),
  43      'aggregator_feed_source' => array(
  44        'arguments' => array('feed' => NULL),
  45        'file' => 'aggregator.pages.inc',
  46        'template' => 'aggregator-feed-source',
  47      ),
  48      'aggregator_block_item' => array(
  49        'arguments' => array('item' => NULL, 'feed' => 0),
  50      ),
  51      'aggregator_summary_items' => array(
  52        'arguments' => array('summary_items' => NULL, 'source' => NULL),
  53        'file' => 'aggregator.pages.inc',
  54        'template' => 'aggregator-summary-items',
  55      ),
  56      'aggregator_summary_item' => array(
  57        'arguments' => array('item' => NULL),
  58        'file' => 'aggregator.pages.inc',
  59        'template' => 'aggregator-summary-item',
  60      ),
  61      'aggregator_item' => array(
  62        'arguments' => array('item' => NULL),
  63        'file' => 'aggregator.pages.inc',
  64        'template' => 'aggregator-item',
  65      ),
  66      'aggregator_page_opml' => array(
  67        'arguments' => array('feeds' => NULL),
  68        'file' => 'aggregator.pages.inc',
  69      ),
  70      'aggregator_page_rss' => array(
  71        'arguments' => array('feeds' => NULL, 'category' => NULL),
  72        'file' => 'aggregator.pages.inc',
  73      ),
  74    );
  75  }
  76  
  77  /**
  78   * Implementation of hook_menu().
  79   */
  80  function aggregator_menu() {
  81    $items['admin/content/aggregator'] = array(
  82      'title' => 'Feed aggregator',
  83      'description' => "Configure which content your site aggregates from other sites, how often it polls them, and how they're categorized.",
  84      'page callback' => 'aggregator_admin_overview',
  85      'access arguments' => array('administer news feeds'),
  86      'file' => 'aggregator.admin.inc',
  87    );
  88    $items['admin/content/aggregator/add/feed'] = array(
  89      'title' => 'Add feed',
  90      'page callback' => 'drupal_get_form',
  91      'page arguments' => array('aggregator_form_feed'),
  92      'access arguments' => array('administer news feeds'),
  93      'type' => MENU_LOCAL_TASK,
  94      'parent' => 'admin/content/aggregator',
  95      'file' => 'aggregator.admin.inc',
  96    );
  97    $items['admin/content/aggregator/add/category'] = array(
  98      'title' => 'Add category',
  99      'page callback' => 'drupal_get_form',
 100      'page arguments' => array('aggregator_form_category'),
 101      'access arguments' => array('administer news feeds'),
 102      'type' => MENU_LOCAL_TASK,
 103      'parent' => 'admin/content/aggregator',
 104      'file' => 'aggregator.admin.inc',
 105    );
 106    $items['admin/content/aggregator/remove/%aggregator_feed'] = array(
 107      'title' => 'Remove items',
 108      'page callback' => 'drupal_get_form',
 109      'page arguments' => array('aggregator_admin_remove_feed', 4),
 110      'access arguments' => array('administer news feeds'),
 111      'type' => MENU_CALLBACK,
 112      'file' => 'aggregator.admin.inc',
 113    );
 114    $items['admin/content/aggregator/update/%aggregator_feed'] = array(
 115      'title' => 'Update items',
 116      'page callback' => 'aggregator_admin_refresh_feed',
 117      'page arguments' => array(4),
 118      'access arguments' => array('administer news feeds'),
 119      'type' => MENU_CALLBACK,
 120      'file' => 'aggregator.admin.inc',
 121    );
 122    $items['admin/content/aggregator/list'] = array(
 123      'title' => 'List',
 124      'type' => MENU_DEFAULT_LOCAL_TASK,
 125      'weight' => -10,
 126    );
 127    $items['admin/content/aggregator/settings'] = array(
 128      'title' => 'Settings',
 129      'page callback' => 'drupal_get_form',
 130      'page arguments' => array('aggregator_admin_settings'),
 131      'type' => MENU_LOCAL_TASK,
 132      'weight' => 10,
 133      'access arguments' => array('administer news feeds'),
 134      'file' => 'aggregator.admin.inc',
 135    );
 136    $items['aggregator'] = array(
 137      'title' => 'Feed aggregator',
 138      'page callback' => 'aggregator_page_last',
 139      'access arguments' => array('access news feeds'),
 140      'weight' => 5,
 141      'file' => 'aggregator.pages.inc',
 142    );
 143    $items['aggregator/sources'] = array(
 144      'title' => 'Sources',
 145      'page callback' => 'aggregator_page_sources',
 146      'access arguments' => array('access news feeds'),
 147      'file' => 'aggregator.pages.inc',
 148    );
 149    $items['aggregator/categories'] = array(
 150      'title' => 'Categories',
 151      'page callback' => 'aggregator_page_categories',
 152      'access callback' => '_aggregator_has_categories',
 153      'file' => 'aggregator.pages.inc',
 154    );
 155    $items['aggregator/rss'] = array(
 156      'title' => 'RSS feed',
 157      'page callback' => 'aggregator_page_rss',
 158      'access arguments' => array('access news feeds'),
 159      'type' => MENU_CALLBACK,
 160      'file' => 'aggregator.pages.inc',
 161    );
 162    $items['aggregator/opml'] = array(
 163      'title' => 'OPML feed',
 164      'page callback' => 'aggregator_page_opml',
 165      'access arguments' => array('access news feeds'),
 166      'type' => MENU_CALLBACK,
 167      'file' => 'aggregator.pages.inc',
 168    );
 169    $items['aggregator/categories/%aggregator_category'] = array(
 170      'title callback' => '_aggregator_category_title',
 171      'title arguments' => array(2),
 172      'page callback' => 'aggregator_page_category',
 173      'page arguments' => array(2),
 174      'access callback' => 'user_access',
 175      'access arguments' => array('access news feeds'),
 176      'file' => 'aggregator.pages.inc',
 177    );
 178    $items['aggregator/categories/%aggregator_category/view'] = array(
 179      'title' => 'View',
 180      'type' => MENU_DEFAULT_LOCAL_TASK,
 181      'weight' => -10,
 182    );
 183    $items['aggregator/categories/%aggregator_category/categorize'] = array(
 184      'title' => 'Categorize',
 185      'page callback' => 'drupal_get_form',
 186      'page arguments' => array('aggregator_page_category', 2),
 187      'access arguments' => array('administer news feeds'),
 188      'type' => MENU_LOCAL_TASK,
 189      'file' => 'aggregator.pages.inc',
 190    );
 191    $items['aggregator/categories/%aggregator_category/configure'] = array(
 192      'title' => 'Configure',
 193      'page callback' => 'drupal_get_form',
 194      'page arguments' => array('aggregator_form_category', 2),
 195      'access arguments' => array('administer news feeds'),
 196      'type' => MENU_LOCAL_TASK,
 197      'weight' => 1,
 198      'file' => 'aggregator.admin.inc',
 199    );
 200    $items['aggregator/sources/%aggregator_feed'] = array(
 201      'page callback' => 'aggregator_page_source',
 202      'page arguments' => array(2),
 203      'access arguments' => array('access news feeds'),
 204      'type' => MENU_CALLBACK,
 205      'file' => 'aggregator.pages.inc',
 206    );
 207    $items['aggregator/sources/%aggregator_feed/view'] = array(
 208      'title' => 'View',
 209      'type' => MENU_DEFAULT_LOCAL_TASK,
 210      'weight' => -10,
 211    );
 212    $items['aggregator/sources/%aggregator_feed/categorize'] = array(
 213      'title' => 'Categorize',
 214      'page callback' => 'drupal_get_form',
 215      'page arguments' => array('aggregator_page_source', 2),
 216      'access arguments' => array('administer news feeds'),
 217      'type' => MENU_LOCAL_TASK,
 218      'file' => 'aggregator.pages.inc',
 219    );
 220    $items['aggregator/sources/%aggregator_feed/configure'] = array(
 221      'title' => 'Configure',
 222      'page callback' => 'drupal_get_form',
 223      'page arguments' => array('aggregator_form_feed', 2),
 224      'access arguments' => array('administer news feeds'),
 225      'type' => MENU_LOCAL_TASK,
 226      'weight' => 1,
 227      'file' => 'aggregator.admin.inc',
 228    );
 229    $items['admin/content/aggregator/edit/feed/%aggregator_feed'] = array(
 230      'title' => 'Edit feed',
 231      'page callback' => 'drupal_get_form',
 232      'page arguments' => array('aggregator_form_feed', 5),
 233      'access arguments' => array('administer news feeds'),
 234      'type' => MENU_CALLBACK,
 235      'file' => 'aggregator.admin.inc',
 236    );
 237    $items['admin/content/aggregator/edit/category/%aggregator_category'] = array(
 238      'title' => 'Edit category',
 239      'page callback' => 'drupal_get_form',
 240      'page arguments' => array('aggregator_form_category', 5),
 241      'access arguments' => array('administer news feeds'),
 242      'type' => MENU_CALLBACK,
 243      'file' => 'aggregator.admin.inc',
 244    );
 245  
 246    return $items;
 247  }
 248  
 249  /**
 250   * Menu callback.
 251   *
 252   * @return
 253   *   An aggregator category title.
 254   */
 255  function _aggregator_category_title($category) {
 256    return $category['title'];
 257  }
 258  
 259  /**
 260   * Implementation of hook_init().
 261   */
 262  function aggregator_init() {
 263    drupal_add_css(drupal_get_path('module', 'aggregator') .'/aggregator.css');
 264  }
 265  
 266  /**
 267   * Find out whether there are any aggregator categories.
 268   *
 269   * @return
 270   *   TRUE if there is at least one category and the user has access to them, FALSE otherwise.
 271   */
 272  function _aggregator_has_categories() {
 273    return user_access('access news feeds') && db_result(db_query('SELECT COUNT(*) FROM {aggregator_category}'));
 274  }
 275  
 276  /**
 277   * Implementation of hook_perm().
 278   */
 279  function aggregator_perm() {
 280    return array('administer news feeds', 'access news feeds');
 281  }
 282  
 283  /**
 284   * Implementation of hook_cron().
 285   *
 286   * Checks news feeds for updates once their refresh interval has elapsed.
 287   */
 288  function aggregator_cron() {
 289    $result = db_query('SELECT * FROM {aggregator_feed} WHERE checked + refresh < %d', time());
 290    while ($feed = db_fetch_array($result)) {
 291      aggregator_refresh($feed);
 292    }
 293  }
 294  
 295  /**
 296   * Implementation of hook_block().
 297   *
 298   * Generates blocks for the latest news items in each category and feed.
 299   */
 300  function aggregator_block($op = 'list', $delta = 0, $edit = array()) {
 301    if ($op == 'list') {
 302      $result = db_query('SELECT cid, title FROM {aggregator_category} ORDER BY title');
 303      while ($category = db_fetch_object($result)) {
 304        $block['category-'. $category->cid]['info'] = t('!title category latest items', array('!title' => $category->title));
 305      }
 306      $result = db_query('SELECT fid, title FROM {aggregator_feed} ORDER BY fid');
 307      while ($feed = db_fetch_object($result)) {
 308        $block['feed-'. $feed->fid]['info'] = t('!title feed latest items', array('!title' => $feed->title));
 309      }
 310    }
 311    else if ($op == 'configure') {
 312      list($type, $id) = explode('-', $delta);
 313      if ($type == 'category') {
 314        $value = db_result(db_query('SELECT block FROM {aggregator_category} WHERE cid = %d', $id));
 315      }
 316      else {
 317        $value = db_result(db_query('SELECT block FROM {aggregator_feed} WHERE fid = %d', $id));
 318      }
 319      $form['block'] = array('#type' => 'select', '#title' => t('Number of news items in block'), '#default_value' => $value, '#options' => drupal_map_assoc(array(2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)));
 320      return $form;
 321    }
 322    else if ($op == 'save') {
 323      list($type, $id) = explode('-', $delta);
 324      if ($type == 'category') {
 325        $value = db_query('UPDATE {aggregator_category} SET block = %d WHERE cid = %d', $edit['block'], $id);
 326      }
 327      else {
 328        $value = db_query('UPDATE {aggregator_feed} SET block = %d WHERE fid = %d', $edit['block'], $id);
 329      }
 330    }
 331    else if ($op == 'view') {
 332      if (user_access('access news feeds')) {
 333        list($type, $id) = explode('-', $delta);
 334        switch ($type) {
 335          case 'feed':
 336            if ($feed = db_fetch_object(db_query('SELECT fid, title, block FROM {aggregator_feed} WHERE fid = %d', $id))) {
 337              $block['subject'] = check_plain($feed->title);
 338              $result = db_query_range('SELECT * FROM {aggregator_item} WHERE fid = %d ORDER BY timestamp DESC, iid DESC', $feed->fid, 0, $feed->block);
 339              $read_more = theme('more_link', url('aggregator/sources/'. $feed->fid), t("View this feed's recent news."));
 340            }
 341            break;
 342  
 343          case 'category':
 344            if ($category = db_fetch_object(db_query('SELECT cid, title, block FROM {aggregator_category} WHERE cid = %d', $id))) {
 345              $block['subject'] = check_plain($category->title);
 346              $result = db_query_range('SELECT i.* FROM {aggregator_category_item} ci LEFT JOIN {aggregator_item} i ON ci.iid = i.iid WHERE ci.cid = %d ORDER BY i.timestamp DESC, i.iid DESC', $category->cid, 0, $category->block);
 347              $read_more = theme('more_link', url('aggregator/categories/'. $category->cid), t("View this category's recent news."));
 348            }
 349            break;
 350        }
 351        $items = array();
 352        while ($item = db_fetch_object($result)) {
 353          $items[] = theme('aggregator_block_item', $item);
 354        }
 355  
 356        // Only display the block if there are items to show.
 357        if (count($items) > 0) {
 358          $block['content'] = theme('item_list', $items) . $read_more;
 359        }
 360      }
 361    }
 362    if (isset($block)) {
 363      return $block;
 364    }
 365  }
 366  
 367  /**
 368   * Add/edit/delete aggregator categories.
 369   *
 370   * @param $edit
 371   *   An associative array describing the category to be added/edited/deleted.
 372   */
 373  function aggregator_save_category($edit) {
 374    $link_path = 'aggregator/categories/';
 375    if (!empty($edit['cid'])) {
 376      $link_path .= $edit['cid'];
 377      if (!empty($edit['title'])) {
 378        db_query("UPDATE {aggregator_category} SET title = '%s', description = '%s' WHERE cid = %d", $edit['title'], $edit['description'], $edit['cid']);
 379        $op = 'update';
 380      }
 381      else {
 382        db_query('DELETE FROM {aggregator_category} WHERE cid = %d', $edit['cid']);
 383        // Make sure there is no active block for this category.
 384        db_query("DELETE FROM {blocks} WHERE module = '%s' AND delta = '%s'", 'aggregator', 'category-' . $edit['cid']);
 385        $edit['title'] = '';
 386        $op = 'delete';
 387      }
 388    }
 389    else if (!empty($edit['title'])) {
 390      // A single unique id for bundles and feeds, to use in blocks
 391      db_query("INSERT INTO {aggregator_category} (title, description, block) VALUES ('%s', '%s', 5)", $edit['title'], $edit['description']);
 392      $link_path .= db_last_insert_id('aggregator_category', 'cid');
 393      $op = 'insert';
 394    }
 395    if (isset($op)) {
 396      menu_link_maintain('aggregator', $op, $link_path, $edit['title']);
 397    }
 398  }
 399  
 400  /**
 401   * Add/edit/delete an aggregator feed.
 402   *
 403   * @param $edit
 404   *   An associative array describing the feed to be added/edited/deleted.
 405   */
 406  function aggregator_save_feed($edit) {
 407    if (!empty($edit['fid'])) {
 408      // An existing feed is being modified, delete the category listings.
 409      db_query('DELETE FROM {aggregator_category_feed} WHERE fid = %d', $edit['fid']);
 410    }
 411    if (!empty($edit['fid']) && !empty($edit['title'])) {
 412      db_query("UPDATE {aggregator_feed} SET title = '%s', url = '%s', refresh = %d WHERE fid = %d", $edit['title'], $edit['url'], $edit['refresh'], $edit['fid']);
 413    }
 414    else if (!empty($edit['fid'])) {
 415      $items = array();
 416      $result = db_query('SELECT iid FROM {aggregator_item} WHERE fid = %d', $edit['fid']);
 417      while ($item = db_fetch_object($result)) {
 418        $items[] = "iid = $item->iid";
 419      }
 420      if (!empty($items)) {
 421        db_query('DELETE FROM {aggregator_category_item} WHERE '. implode(' OR ', $items));
 422      }
 423      db_query('DELETE FROM {aggregator_feed} WHERE fid = %d', $edit['fid']);
 424      db_query('DELETE FROM {aggregator_item} WHERE fid = %d', $edit['fid']);
 425      // Make sure there is no active block for this feed.
 426      db_query("DELETE FROM {blocks} WHERE module = '%s' AND delta = '%s'", 'aggregator', 'feed-' . $edit['fid']);
 427    }
 428    else if (!empty($edit['title'])) {
 429      db_query("INSERT INTO {aggregator_feed} (title, url, refresh, block, description, image) VALUES ('%s', '%s', %d, 5, '', '')", $edit['title'], $edit['url'], $edit['refresh']);
 430      // A single unique id for bundles and feeds, to use in blocks.
 431      $edit['fid'] = db_last_insert_id('aggregator_feed', 'fid');
 432    }
 433    if (!empty($edit['title'])) {
 434      // The feed is being saved, save the categories as well.
 435      if (!empty($edit['category'])) {
 436        foreach ($edit['category'] as $cid => $value) {
 437          if ($value) {
 438            db_query('INSERT INTO {aggregator_category_feed} (fid, cid) VALUES (%d, %d)', $edit['fid'], $cid);
 439          }
 440        }
 441      }
 442    }
 443  }
 444  
 445  /**
 446   * Removes all items from a feed.
 447   *
 448   * @param $feed
 449   *   An associative array describing the feed to be cleared.
 450   */
 451  function aggregator_remove($feed) {
 452    $result = db_query('SELECT iid FROM {aggregator_item} WHERE fid = %d', $feed['fid']);
 453    while ($item = db_fetch_object($result)) {
 454      $items[] = "iid = $item->iid";
 455    }
 456    if (!empty($items)) {
 457      db_query('DELETE FROM {aggregator_category_item} WHERE '. implode(' OR ', $items));
 458    }
 459    db_query('DELETE FROM {aggregator_item} WHERE fid = %d', $feed['fid']);
 460    db_query("UPDATE {aggregator_feed} SET checked = 0, etag = '', modified = 0 WHERE fid = %d", $feed['fid']);
 461    drupal_set_message(t('The news items from %site have been removed.', array('%site' => $feed['title'])));
 462  }
 463  
 464  /**
 465   * Call-back function used by the XML parser.
 466   */
 467  function aggregator_element_start($parser, $name, $attributes) {
 468    global $item, $element, $tag, $items, $channel;
 469  
 470    switch ($name) {
 471      case 'IMAGE':
 472      case 'TEXTINPUT':
 473      case 'CONTENT':
 474      case 'SUMMARY':
 475      case 'TAGLINE':
 476      case 'SUBTITLE':
 477      case 'LOGO':
 478      case 'INFO':
 479        $element = $name;
 480        break;
 481      case 'ID':
 482        if ($element != 'ITEM') {
 483          $element = $name;
 484        }
 485      case 'LINK':
 486        if (!empty($attributes['REL']) && $attributes['REL'] == 'alternate') {
 487          if ($element == 'ITEM') {
 488            $items[$item]['LINK'] = $attributes['HREF'];
 489          }
 490          else {
 491            $channel['LINK'] = $attributes['HREF'];
 492          }
 493        }
 494        break;
 495      case 'ITEM':
 496        $element = $name;
 497        $item += 1;
 498        break;
 499      case 'ENTRY':
 500        $element = 'ITEM';
 501        $item += 1;
 502        break;
 503    }
 504  
 505    $tag = $name;
 506  }
 507  
 508  /**
 509   * Call-back function used by the XML parser.
 510   */
 511  function aggregator_element_end($parser, $name) {
 512    global $element;
 513  
 514    switch ($name) {
 515      case 'IMAGE':
 516      case 'TEXTINPUT':
 517      case 'ITEM':
 518      case 'ENTRY':
 519      case 'CONTENT':
 520      case 'INFO':
 521        $element = '';
 522        break;
 523      case 'ID':
 524        if ($element == 'ID') {
 525          $element = '';
 526        }
 527    }
 528  }
 529  
 530  /**
 531   * Call-back function used by the XML parser.
 532   */
 533  function aggregator_element_data($parser, $data) {
 534    global $channel, $element, $items, $item, $image, $tag;
 535    $items += array($item => array());
 536    switch ($element) {
 537      case 'ITEM':
 538        $items[$item] += array($tag => '');
 539        $items[$item][$tag] .= $data;
 540        break;
 541      case 'IMAGE':
 542      case 'LOGO':
 543        $image += array($tag => '');
 544        $image[$tag] .= $data;
 545        break;
 546      case 'LINK':
 547        if ($data) {
 548          $items[$item] += array($tag => '');
 549          $items[$item][$tag] .= $data;
 550        }
 551        break;
 552      case 'CONTENT':
 553        $items[$item] += array('CONTENT' => '');
 554        $items[$item]['CONTENT'] .= $data;
 555        break;
 556      case 'SUMMARY':
 557        $items[$item] += array('SUMMARY' => '');
 558        $items[$item]['SUMMARY'] .= $data;
 559        break;
 560      case 'TAGLINE':
 561      case 'SUBTITLE':
 562        $channel += array('DESCRIPTION' => '');
 563        $channel['DESCRIPTION'] .= $data;
 564        break;
 565      case 'INFO':
 566      case 'ID':
 567      case 'TEXTINPUT':
 568        // The sub-element is not supported. However, we must recognize
 569        // it or its contents will end up in the item array.
 570        break;
 571      default:
 572        $channel += array($tag => '');
 573        $channel[$tag] .= $data;
 574    }
 575  }
 576  
 577  /**
 578   * Checks a news feed for new items.
 579   *
 580   * @param $feed
 581   *   An associative array describing the feed to be refreshed.
 582   */
 583  function aggregator_refresh($feed) {
 584    global $channel, $image;
 585  
 586    // Generate conditional GET headers.
 587    $headers = array();
 588    if ($feed['etag']) {
 589      $headers['If-None-Match'] = $feed['etag'];
 590    }
 591    if ($feed['modified']) {
 592      $headers['If-Modified-Since'] = gmdate('D, d M Y H:i:s', $feed['modified']) .' GMT';
 593    }
 594  
 595    // Request feed.
 596    $result = drupal_http_request($feed['url'], $headers);
 597  
 598    // Process HTTP response code.
 599    switch ($result->code) {
 600      case 304:
 601        db_query('UPDATE {aggregator_feed} SET checked = %d WHERE fid = %d', time(), $feed['fid']);
 602        drupal_set_message(t('There is no new syndicated content from %site.', array('%site' => $feed['title'])));
 603        break;
 604      case 301:
 605        $feed['url'] = $result->redirect_url;
 606        watchdog('aggregator', 'Updated URL for feed %title to %url.', array('%title' => $feed['title'], '%url' => $feed['url']));
 607        // Deliberate no break.
 608      case 200:
 609      case 302:
 610      case 307:
 611        // Filter the input data:
 612        if (aggregator_parse_feed($result->data, $feed)) {
 613          $modified = empty($result->headers['Last-Modified']) ? 0 : strtotime($result->headers['Last-Modified']);
 614  
 615          // Prepare the channel data.
 616          foreach ($channel as $key => $value) {
 617            $channel[$key] = trim($value);
 618          }
 619  
 620          // Prepare the image data (if any).
 621          foreach ($image as $key => $value) {
 622            $image[$key] = trim($value);
 623          }
 624  
 625          if (!empty($image['LINK']) && !empty($image['URL']) && !empty($image['TITLE'])) {
 626            // Note, we should really use theme_image() here but that only works with local images it won't work with images fetched with a URL unless PHP version > 5
 627            $image = '<a href="'. check_url($image['LINK']) .'" class="feed-image"><img src="'. check_url($image['URL']) .'" alt="'. check_plain($image['TITLE']) .'" /></a>';
 628          }
 629          else {
 630            $image = NULL;
 631          }
 632  
 633          $etag = empty($result->headers['ETag']) ? '' : $result->headers['ETag'];
 634          // Update the feed data.
 635          db_query("UPDATE {aggregator_feed} SET url = '%s', checked = %d, link = '%s', description = '%s', image = '%s', etag = '%s', modified = %d WHERE fid = %d", $feed['url'], time(), $channel['LINK'], $channel['DESCRIPTION'], $image, $etag, $modified, $feed['fid']);
 636  
 637          // Clear the cache.
 638          cache_clear_all();
 639  
 640          watchdog('aggregator', 'There is new syndicated content from %site.', array('%site' => $feed['title']));
 641          drupal_set_message(t('There is new syndicated content from %site.', array('%site' => $feed['title'])));
 642        }
 643        break;
 644      default:
 645        watchdog('aggregator', 'The feed from %site seems to be broken, due to "%error".', array('%site' => $feed['title'], '%error' => $result->code .' '. $result->error), WATCHDOG_WARNING);
 646        drupal_set_message(t('The feed from %site seems to be broken, because of error "%error".', array('%site' => $feed['title'], '%error' => $result->code .' '. $result->error)));
 647    }
 648  }
 649  
 650  /**
 651   * Parse the W3C date/time format, a subset of ISO 8601. PHP date parsing
 652   * functions do not handle this format.
 653   * See http://www.w3.org/TR/NOTE-datetime for more information.
 654   * Originally from MagpieRSS (http://magpierss.sourceforge.net/).
 655   *
 656   * @param $date_str
 657   *   A string with a potentially W3C DTF date.
 658   * @return
 659   *   A timestamp if parsed successfully or FALSE if not.
 660   */
 661  function aggregator_parse_w3cdtf($date_str) {
 662    if (preg_match('/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})(:(\d{2}))?(?:([-+])(\d{2}):?(\d{2})|(Z))?/', $date_str, $match)) {
 663      list($year, $month, $day, $hours, $minutes, $seconds) = array($match[1], $match[2], $match[3], $match[4], $match[5], $match[6]);
 664      // calc epoch for current date assuming GMT
 665      $epoch = gmmktime($hours, $minutes, $seconds, $month, $day, $year);
 666      if ($match[10] != 'Z') { // Z is zulu time, aka GMT
 667        list($tz_mod, $tz_hour, $tz_min) = array($match[8], $match[9], $match[10]);
 668        // zero out the variables
 669        if (!$tz_hour) {
 670          $tz_hour = 0;
 671        }
 672        if (!$tz_min) {
 673          $tz_min = 0;
 674        }
 675        $offset_secs = (($tz_hour * 60) + $tz_min) * 60;
 676        // is timezone ahead of GMT?  then subtract offset
 677        if ($tz_mod == '+') {
 678          $offset_secs *= -1;
 679        }
 680        $epoch += $offset_secs;
 681      }
 682      return $epoch;
 683    }
 684    else {
 685      return FALSE;
 686    }
 687  }
 688  
 689  /**
 690   * Parse a feed and store its items.
 691   *
 692   * @param $data
 693   *   The feed data.
 694   * @param $feed
 695   *   An associative array describing the feed to be parsed.
 696   * @return
 697   *   0 on error, 1 otherwise.
 698   */
 699  function aggregator_parse_feed(&$data, $feed) {
 700    global $items, $image, $channel;
 701  
 702    // Unset the global variables before we use them:
 703    unset($GLOBALS['element'], $GLOBALS['item'], $GLOBALS['tag']);
 704    $items = array();
 705    $image = array();
 706    $channel = array();
 707  
 708    // parse the data:
 709    $xml_parser = drupal_xml_parser_create($data);
 710    xml_set_element_handler($xml_parser, 'aggregator_element_start', 'aggregator_element_end');
 711    xml_set_character_data_handler($xml_parser, 'aggregator_element_data');
 712  
 713    if (!xml_parse($xml_parser, $data, 1)) {
 714      watchdog('aggregator', 'The feed from %site seems to be broken, due to an error "%error" on line %line.', array('%site' => $feed['title'], '%error' => xml_error_string(xml_get_error_code($xml_parser)), '%line' => xml_get_current_line_number($xml_parser)), WATCHDOG_WARNING);
 715      drupal_set_message(t('The feed from %site seems to be broken, because of error "%error" on line %line.', array('%site' => $feed['title'], '%error' => xml_error_string(xml_get_error_code($xml_parser)), '%line' => xml_get_current_line_number($xml_parser))), 'error');
 716      return 0;
 717    }
 718    xml_parser_free($xml_parser);
 719  
 720    // We reverse the array such that we store the first item last, and the last
 721    // item first. In the database, the newest item should be at the top.
 722    $items = array_reverse($items);
 723  
 724    // Initialize variables.
 725    $title = $link = $author = $description = $guid = NULL;
 726    foreach ($items as $item) {
 727      unset($title, $link, $author, $description, $guid);
 728  
 729      // Prepare the item:
 730      foreach ($item as $key => $value) {
 731        $item[$key] = trim($value);
 732      }
 733  
 734      // Resolve the item's title. If no title is found, we use up to 40
 735      // characters of the description ending at a word boundary but not
 736      // splitting potential entities.
 737      if (!empty($item['TITLE'])) {
 738        $title = $item['TITLE'];
 739      }
 740      elseif (!empty($item['DESCRIPTION'])) {
 741        $title = preg_replace('/^(.*)[^\w;&].*?$/', "\\1", truncate_utf8($item['DESCRIPTION'], 40));
 742      }
 743      else {
 744        $title = '';
 745      }
 746  
 747      // Resolve the items link.
 748      if (!empty($item['LINK'])) {
 749        $link = $item['LINK'];
 750      }
 751      else {
 752        $link = $feed['link'];
 753      }
 754  
 755      // Atom feeds use ID rather than GUID.
 756      if (isset($item['GUID'])) {
 757        $guid = $item['GUID'];
 758      }
 759      elseif (isset($item['ID'])) {
 760        $guid = $item['ID'];
 761      }
 762      else {
 763        $guid = '';
 764      }
 765  
 766      // Atom feeds have a CONTENT and/or SUMMARY tag instead of a DESCRIPTION tag.
 767      if (!empty($item['CONTENT:ENCODED'])) {
 768        $item['DESCRIPTION'] = $item['CONTENT:ENCODED'];
 769      }
 770      else if (!empty($item['SUMMARY'])) {
 771        $item['DESCRIPTION'] = $item['SUMMARY'];
 772      }
 773      else if (!empty($item['CONTENT'])) {
 774        $item['DESCRIPTION'] = $item['CONTENT'];
 775      }
 776  
 777      // Try to resolve and parse the item's publication date. If no date is
 778      // found, we use the current date instead.
 779      $date = 'now';
 780      foreach (array('PUBDATE', 'DC:DATE', 'DCTERMS:ISSUED', 'DCTERMS:CREATED', 'DCTERMS:MODIFIED', 'ISSUED', 'CREATED', 'MODIFIED', 'PUBLISHED', 'UPDATED') as $key) {
 781        if (!empty($item[$key])) {
 782          $date = $item[$key];
 783          break;
 784        }
 785      }
 786  
 787      $timestamp = strtotime($date); // As of PHP 5.1.0, strtotime returns FALSE on failure instead of -1.
 788      if ($timestamp <= 0) {
 789        $timestamp = aggregator_parse_w3cdtf($date); // Returns FALSE on failure
 790        if (!$timestamp) {
 791          $timestamp = time(); // better than nothing
 792        }
 793      }
 794  
 795      // Resolve dc:creator tag as the item author if author tag is not set.
 796      if (empty($item['AUTHOR']) && !empty($item['DC:CREATOR'])) {
 797        $item['AUTHOR'] = $item['DC:CREATOR'];
 798      }
 799  
 800      // Save this item. Try to avoid duplicate entries as much as possible. If
 801      // we find a duplicate entry, we resolve it and pass along its ID is such
 802      // that we can update it if needed.
 803      if (!empty($guid)) {
 804        $entry = db_fetch_object(db_query("SELECT iid FROM {aggregator_item} WHERE fid = %d AND guid = '%s'", $feed['fid'], $guid));
 805      }
 806      else if ($link && $link != $feed['link'] && $link != $feed['url']) {
 807        $entry = db_fetch_object(db_query("SELECT iid FROM {aggregator_item} WHERE fid = %d AND link = '%s'", $feed['fid'], $link));
 808      }
 809      else {
 810        $entry = db_fetch_object(db_query("SELECT iid FROM {aggregator_item} WHERE fid = %d AND title = '%s'", $feed['fid'], $title));
 811      }
 812      $item += array('AUTHOR' => '', 'DESCRIPTION' => '');
 813      aggregator_save_item(array('iid' => (isset($entry->iid) ? $entry->iid:  ''), 'fid' => $feed['fid'], 'timestamp' => $timestamp, 'title' => $title, 'link' => $link, 'author' => $item['AUTHOR'], 'description' => $item['DESCRIPTION'], 'guid' => $guid));
 814    }
 815  
 816    // Remove all items that are older than flush item timer.
 817    $age = time() - variable_get('aggregator_clear', 9676800);
 818    $result = db_query('SELECT iid FROM {aggregator_item} WHERE fid = %d AND timestamp < %d', $feed['fid'], $age);
 819  
 820    $items = array();
 821    $num_rows = FALSE;
 822    while ($item = db_fetch_object($result)) {
 823      $items[] = $item->iid;
 824      $num_rows = TRUE;
 825    }
 826    if ($num_rows) {
 827      db_query('DELETE FROM {aggregator_category_item} WHERE iid IN ('. implode(', ', $items) .')');
 828      db_query('DELETE FROM {aggregator_item} WHERE fid = %d AND timestamp < %d', $feed['fid'], $age);
 829    }
 830  
 831    return 1;
 832  }
 833  
 834  /**
 835   * Add/edit/delete an aggregator item.
 836   *
 837   * @param $edit
 838   *   An associative array describing the item to be added/edited/deleted.
 839   */
 840  function aggregator_save_item($edit) {
 841    if ($edit['iid'] && $edit['title']) {
 842      db_query("UPDATE {aggregator_item} SET title = '%s', link = '%s', author = '%s', description = '%s', guid = '%s', timestamp = %d WHERE iid = %d", $edit['title'], $edit['link'], $edit['author'], $edit['description'], $edit['guid'], $edit['timestamp'], $edit['iid']);
 843    }
 844    else if ($edit['iid']) {
 845      db_query('DELETE FROM {aggregator_item} WHERE iid = %d', $edit['iid']);
 846      db_query('DELETE FROM {aggregator_category_item} WHERE iid = %d', $edit['iid']);
 847    }
 848    else if ($edit['title'] && $edit['link']) {
 849      db_query("INSERT INTO {aggregator_item} (fid, title, link, author, description, timestamp, guid) VALUES (%d, '%s', '%s', '%s', '%s', %d, '%s')", $edit['fid'], $edit['title'], $edit['link'], $edit['author'], $edit['description'], $edit['timestamp'], $edit['guid']);
 850      $edit['iid'] = db_last_insert_id('aggregator_item', 'iid');
 851      // file the items in the categories indicated by the feed
 852      $categories = db_query('SELECT cid FROM {aggregator_category_feed} WHERE fid = %d', $edit['fid']);
 853      while ($category = db_fetch_object($categories)) {
 854        db_query('INSERT INTO {aggregator_category_item} (cid, iid) VALUES (%d, %d)', $category->cid, $edit['iid']);
 855      }
 856    }
 857  }
 858  
 859  /**
 860   * Load an aggregator feed.
 861   *
 862   * @param $fid
 863   *   The feed id.
 864   * @return
 865   *   An associative array describing the feed.
 866   */
 867  function aggregator_feed_load($fid) {
 868    static $feeds;
 869    if (!isset($feeds[$fid])) {
 870      $feeds[$fid] = db_fetch_array(db_query('SELECT * FROM {aggregator_feed} WHERE fid = %d', $fid));
 871    }
 872    return $feeds[$fid];
 873  }
 874  
 875  /**
 876   * Load an aggregator category.
 877   *
 878   * @param $cid
 879   *   The category id.
 880   * @return
 881   *   An associative array describing the category.
 882   */
 883  function aggregator_category_load($cid) {
 884    static $categories;
 885    if (!isset($categories[$cid])) {
 886      $categories[$cid] = db_fetch_array(db_query('SELECT * FROM {aggregator_category} WHERE cid = %d', $cid));
 887    }
 888    return $categories[$cid];
 889  }
 890  
 891  /**
 892   * Format an individual feed item for display in the block.
 893   *
 894   * @param $item
 895   *   The item to be displayed.
 896   * @param $feed
 897   *   Not used.
 898   * @return
 899   *   The item HTML.
 900   * @ingroup themeable
 901   */
 902  function theme_aggregator_block_item($item, $feed = 0) {
 903    global $user;
 904  
 905    $output = '';
 906    if ($user->uid && module_exists('blog') && user_access('create blog entries')) {
 907      if ($image = theme('image', 'misc/blog.png', t('blog it'), t('blog it'))) {
 908        $output .= '<div class="icon">'. l($image, 'node/add/blog', array('attributes' => array('title' => t('Comment on this news item in your personal blog.'), 'class' => 'blog-it'), 'query' => "iid=$item->iid", 'html' => TRUE)) .'</div>';
 909      }
 910    }
 911  
 912    // Display the external link to the item.
 913    $output .= '<a href="'. check_url($item->link) .'">'. check_plain($item->title) ."</a>\n";
 914  
 915    return $output;
 916  }
 917  
 918  /**
 919   * Safely render HTML content, as allowed.
 920   *
 921   * @param $value
 922   *   The content to be filtered.
 923   * @return
 924   *   The filtered content.
 925   */
 926  function aggregator_filter_xss($value) {
 927    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));
 928  }
 929  
 930  /**
 931   * Helper function for drupal_map_assoc.
 932   *
 933   * @param $count
 934   *   Items count.
 935   * @return
 936   *   Plural-formatted "@count items"
 937   */
 938  function _aggregator_items($count) {
 939    return format_plural($count, '1 item', '@count items');
 940  }