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<?php

/**

 * @file

 *   Downloading and parsing functions for Common Syndication Parser.

 *   Pillaged from FeedAPI common syndication parser.

 *

 * @todo Restructure. OO could work wonders here.

 * @todo Write unit tests.

 * @todo Keep in Feeds project or host on Drupal?

 */

/**

 * Parse the feed into a data structure.

 *

 * @param $feed

 *  The feed object (contains the URL or the parsed XML structure.

 * @return

 *  stdClass The structured datas extracted from the feed.

 */

function common_syndication_parser_parse($string) {

  @ $xml = simplexml_load_string($string, NULL, LIBXML_NOERROR | LIBXML_NOWARNING | LIBXML_NOCDATA);

  // Got a malformed XML.

  if ($xml === FALSE || is_null($xml)) {

    return FALSE;

  }

  $feed_type = _parser_common_syndication_feed_format_detect($xml);

  if ($feed_type ==  "atom1.0") {

    return _parser_common_syndication_atom10_parse($xml);

  }

  if ($feed_type == "RSS2.0" || $feed_type == "RSS0.91" || $feed_type == "RSS0.92") {

    return _parser_common_syndication_RSS20_parse($xml);

  }

  if ($feed_type == "RDF") {

    return _parser_common_syndication_RDF10_parse($xml);

  }

  return FALSE;

}

/**

 * Determine the feed format of a SimpleXML parsed object structure.

 *

 * @param $xml

 *  SimpleXML-preprocessed feed.

 * @return

 *  The feed format short description or FALSE if not compatible.

 */

function _parser_common_syndication_feed_format_detect($xml) {

  if (!is_object($xml)) {

    return FALSE;

  }

  $attr = $xml->attributes();

  $type = strtolower($xml->getName());

  if (isset($xml->entry) && $type == "feed") {

    return "atom1.0";

  }

  if ($type == "rss" && $attr["version"] == "2.0") {

    return "RSS2.0";

  }

  if ($type == "rdf" && isset($xml->channel)) {

    return "RDF";

  }

  if ($type == "rss" && $attr["version"] == "0.91") {

    return "RSS0.91";

  }

  if ($type == "rss" && $attr["version"] == "0.92") {

    return "RSS0.92";

  }

  return FALSE;

}

/**

 * Parse atom feeds.

 */

function _parser_common_syndication_atom10_parse($feed_XML) {

  $parsed_source = array();

  $ns = array(

    "georss" => "http://www.georss.org/georss",

  );

  $base = $feed_XML->xpath("@base");

  $base = (string) array_shift($base);

  if (!valid_url($base, TRUE)) {

    $base = FALSE;

  }

  // Detect the title

  $parsed_source['title'] = isset($feed_XML->title) ? _parser_common_syndication_title("{$feed_XML->title}") : "";

  // Detect the description

  $parsed_source['description'] = isset($feed_XML->subtitle) ? "{$feed_XML->subtitle}" : "";

  $parsed_source['link'] = _parser_common_syndication_link($feed_XML->link);

  if (valid_url($parsed_source['link']) && !valid_url($parsed_source['link'], TRUE) && !empty($base)) {

    $parsed_source['link'] = $base . $parsed_source['link'];

  }

  $parsed_source['items'] = array();

  foreach ($feed_XML->entry as $news) {

    $original_url = NULL;

    $guid = !empty($news->id) ? "{$news->id}" : NULL;

    if (valid_url($guid, TRUE)) {

      $original_url = $guid;

    }

    $georss = (array)$news->children($ns["georss"]);

    $geoname = '';

    if (isset($georss['featureName'])) {

      $geoname = "{$georss['featureName']}";

    }

    $latlon =

    $lat =

    $lon = NULL;

    if (isset($georss['point'])) {

      $latlon = explode(' ', $georss['point']);

      $lat = "{$latlon[0]}";

      $lon = "{$latlon[1]}";

      if (!$geoname) {

        $geoname = "{$lat} {$lon}";

      }

    }

    $additional_taxonomies = array();

    if (isset($news->category)) {

      $additional_taxonomies['ATOM Categories'] = array();

      $additional_taxonomies['ATOM Domains'] = array();

      foreach ($news->category as $category) {

        if (isset($category['scheme'])) {

          $domain = "{$category['scheme']}";

          if (!empty($domain)) {

              if (!isset($additional_taxonomies['ATOM Domains'][$domain])) {

                $additional_taxonomies['ATOM Domains'][$domain] = array();

              }

              $additional_taxonomies['ATOM Domains'][$domain][] = count($additional_taxonomies['ATOM Categories']) - 1;

          }

        }

        $additional_taxonomies['ATOM Categories'][] = "{$category['term']}";

      }

    }

    $title = "{$news->title}";

    $body = '';

    if (!empty($news->content)) {

      foreach ($news->content->children() as $child)  {

        $body .= $child->asXML();

      }

      $body .= "{$news->content}";

    }

    elseif (!empty($news->summary)) {

      foreach ($news->summary->children() as $child)  {

        $body .= $child->asXML();

      }

      $body .= "{$news->summary}";

    }

    if (!empty($news->content['src'])) {

      // some src elements in some valid atom feeds contained no urls at all

      if (valid_url("{$news->content['src']}", TRUE)) {

        $original_url = "{$news->content['src']}";

      }

    }

    $original_author = '';

    if (!empty($news->source->author->name)) {

      $original_author = "{$news->source->author->name}";

    }

    elseif (!empty($news->author->name)) {

      $original_author = "{$news->author->name}";

    }

    elseif (!empty($feed_XML->author->name)) {

      $original_author = "{$feed_XML->author->name}";

    }

    $original_url = _parser_common_syndication_link($news->link);

    $item = array();

    $item['title'] = _parser_common_syndication_title($title, $body);

    $item['description'] = $body;

    $item['author_name'] = $original_author;

    // Fall back to updated for timestamp if both published and issued are

    // empty.

    if (isset($news->published)) {

      $item['timestamp'] = _parser_common_syndication_parse_date("{$news->published}");

    }

    elseif (isset($news->issued)) {

       $item['timestamp'] = _parser_common_syndication_parse_date("{$news->issued}");

    }

    elseif (isset($news->updated)) {

      $item['timestamp'] = _parser_common_syndication_parse_date("{$news->updated}");

    }

    $item['url'] = trim($original_url);

    if (valid_url($item['url']) && !valid_url($item['url'], TRUE) && !empty($base)) {

      $item['url'] = $base . $item['url'];

    }

    // Fall back on URL if GUID is empty.

    if (!empty($guid)) {

      $item['guid'] = $guid;

    }

    else {

      $item['guid'] = $item['url'];

    }

    $item['geolocations'] = array();

    if ($lat && $lon) {

      $item['geolocations'] = array(

        array(

          'name' => $geoname,

          'lat' => $lat,

          'lon' => $lon,

        ),

      );

    }

    $item['tags'] = isset($additional_taxonomies['ATOM Categories']) ? $additional_taxonomies['ATOM Categories'] : array();

    $item['domains'] = isset($additional_taxonomies['ATOM Domains']) ? $additional_taxonomies['ATOM Domains'] : array();

    $parsed_source['items'][] = $item;

  }

  return $parsed_source;

}

/**

 * Parse RDF Site Summary (RSS) 1.0 feeds in RDF/XML format.

 *

 * @see http://web.resource.org/rss/1.0/

 */

function _parser_common_syndication_RDF10_parse($feed_XML) {

  // Declare some canonical standard prefixes for well-known namespaces:

  static $canonical_namespaces = array(

    'rdf'      => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',

    'rdfs'     => 'http://www.w3.org/2000/01/rdf-schema#',

    'xsi'      => 'http://www.w3.org/2001/XMLSchema-instance#',

    'xsd'      => 'http://www.w3.org/2001/XMLSchema#',

    'owl'      => 'http://www.w3.org/2002/07/owl#',

    'dc'       => 'http://purl.org/dc/elements/1.1/',

    'dcterms'  => 'http://purl.org/dc/terms/',

    'dcmitype' => 'http://purl.org/dc/dcmitype/',

    'foaf'     => 'http://xmlns.com/foaf/0.1/',

    'rss'      => 'http://purl.org/rss/1.0/',

  );

  // Get all namespaces declared in the feed element.

  $namespaces = $feed_XML->getNamespaces(TRUE);

  // Process the <rss:channel> resource containing feed metadata:

  foreach ($feed_XML->children($canonical_namespaces['rss'])->channel as $rss_channel) {

    $parsed_source = array(

      'title'       => _parser_common_syndication_title((string) $rss_channel->title),

      'description' => (string) $rss_channel->description,

      'link'        => (string) $rss_channel->link,

      'items'       => array(),

    );

    break;

  }

  // Process each <rss:item> resource contained in the feed:

  foreach ($feed_XML->children($canonical_namespaces['rss'])->item as $rss_item) {

    // Extract all available RDF statements from the feed item's RDF/XML

    // tags, allowing for both the item's attributes and child elements to

    // contain RDF properties:

    $rdf_data = array();

    foreach ($namespaces as $ns => $ns_uri) {

      // Note that we attempt to normalize the found property name

      // namespaces to well-known 'standard' prefixes where possible, as the

      // feed may in principle use any arbitrary prefixes and we should

      // still be able to correctly handle it.

      foreach ($rss_item->attributes($ns_uri) as $attr_name => $attr_value) {

        $ns_prefix = ($ns_prefix = array_search($ns_uri, $canonical_namespaces)) ? $ns_prefix : $ns;

        $rdf_data[$ns_prefix . ':' . $attr_name][] = (string) $attr_value;

      }

      foreach ($rss_item->children($ns_uri) as $rss_property) {

        $ns_prefix = ($ns_prefix = array_search($ns_uri, $canonical_namespaces)) ? $ns_prefix : $ns;

        $rdf_data[$ns_prefix . ':' . $rss_property->getName()][] = (string) $rss_property;

      }

    }

    // Declaratively define mappings that determine how to construct the result object.

    $item = _parser_common_syndication_RDF10_item($rdf_data, array(

      'title'       => array('rss:title', 'dc:title'),

      'description' => array('rss:description', 'dc:description', 'content:encoded'),

      'url'         => array('rss:link', 'rdf:about'),

      'author_name' => array('dc:creator', 'dc:publisher'),

      'guid'        => 'rdf:about',

      'timestamp'   => 'dc:date',

      'tags'        => 'dc:subject'

    ));

    // Special handling for the title:

    $item['title'] = _parser_common_syndication_title($item['title'], $item['description']);

    // Parse any date/time values into Unix timestamps:

    $item['timestamp'] = _parser_common_syndication_parse_date($item['timestamp']);

    // If no GUID found, use the URL of the feed.

    if (empty($item['guid'])) {

      $item['guid'] = $item['url'];

    }

    // Add every found RDF property to the feed item.

    $item['rdf'] = array();

    foreach ($rdf_data as $rdf_property => $rdf_value) {

      // looks nicer in the mapper UI

      // @todo Revisit, not used with feedapi mapper anymore.

      $rdf_property = str_replace(':', '_', $rdf_property);

      $item['rdf'][$rdf_property] = $rdf_value;

    }

    $parsed_source['items'][] = $item;

  }

  return $parsed_source;

}

function _parser_common_syndication_RDF10_property($rdf_data, $rdf_properties = array()) {

  $rdf_properties = is_array($rdf_properties) ? $rdf_properties : array_slice(func_get_args(), 1);

  foreach ($rdf_properties as $rdf_property) {

    if ($rdf_property && !empty($rdf_data[$rdf_property])) {

      // remove empty strings

      return array_filter($rdf_data[$rdf_property], 'strlen');

    }

  }

}

function _parser_common_syndication_RDF10_item($rdf_data, $mappings) {

  foreach ($mappings as $k => $v) {

    $values = _parser_common_syndication_RDF10_property($rdf_data, $v);

    $mappings[$k] = !is_array($values) || count($values) > 1 ? $values : reset($values);

  }

  return $mappings;

}

/**

 * Parse RSS2.0 feeds.

 */

function _parser_common_syndication_RSS20_parse($feed_XML) {

  $ns = array(

    "content" => "http://purl.org/rss/1.0/modules/content/",

     "dc" => "http://purl.org/dc/elements/1.1/",

     "georss" => "http://www.georss.org/georss",

  );

  $parsed_source = array();

  // Detect the title.

  $parsed_source['title'] = isset($feed_XML->channel->title) ? _parser_common_syndication_title("{$feed_XML->channel->title}") : "";

  // Detect the description.

  $parsed_source['description'] = isset($feed_XML->channel->description) ? "{$feed_XML->channel->description}" : "";

  // Detect the link.

  $parsed_source['link'] = isset($feed_XML->channel->link) ? "{$feed_XML->channel->link}" : "";

  $parsed_source['items'] = array();

  foreach ($feed_XML->xpath('//item') as $news) {

    $title = $body = $original_author = $original_url = $guid = '';

    $category = $news->xpath('category');

    // Get children for current namespace.

    $content = (array)$news->children($ns["content"]);

    $dc      = (array)$news->children($ns["dc"]);

    $georss  = (array)$news->children($ns["georss"]);

    $news = (array) $news;

    $news['category'] = $category;

    if (isset($news['title'])) {

      $title = "{$news['title']}";

    }

    if (isset($news['description'])) {

      $body = "{$news['description']}";

    }

    // Some sources use content:encoded as description i.e.

    // PostNuke PageSetter module.

    if (isset($news['encoded'])) {  // content:encoded for PHP < 5.1.2.

      if (strlen($body) < strlen("{$news['encoded']}")) {

        $body = "{$news['encoded']}";

      }

    }

    if (isset($content['encoded'])) { // content:encoded for PHP >= 5.1.2.

      if (strlen($body) < strlen("{$content['encoded']}")) {

        $body = "{$content['encoded']}";

      }

    }

    if (!isset($body)) {

      $body = "{$news['title']}";

    }

    if (!empty($news['author'])) {

      $original_author = "{$news['author']}";

    }

    elseif (!empty($dc["creator"])) {

      $original_author = (string)$dc["creator"];

    }

    if (!empty($news['link'])) {

      $original_url = "{$news['link']}";

      $guid = $original_url;

    }

    if (!empty($news['guid'])) {

      $guid = "{$news['guid']}";

    }

    if (!empty($georss['featureName'])) {

      $geoname = "{$georss['featureName']}";

    }

    $lat =

    $lon =

    $latlon =

    $geoname = NULL;

    if (!empty($georss['point'])) {

      $latlon = explode(' ', $georss['point']);

      $lat = "{$latlon[0]}";

      $lon = "{$latlon[1]}";

      if (!$geoname) {

        $geoname = "$lat $lon";

      }

    }

    $additional_taxonomies = array();

    $additional_taxonomies['RSS Categories'] = array();

    $additional_taxonomies['RSS Domains'] = array();

    if (isset($news['category'])) {

      foreach ($news['category'] as $category) {

        $additional_taxonomies['RSS Categories'][] = "{$category}";

        if (isset($category['domain'])) {

          $domain = "{$category['domain']}";

          if (!empty($domain)) {

              if (!isset($additional_taxonomies['RSS Domains'][$domain])) {

                $additional_taxonomies['RSS Domains'][$domain] = array();

              }

              $additional_taxonomies['RSS Domains'][$domain][] = count($additional_taxonomies['RSS Categories']) - 1;

          }

        }

      }

    }

    $item = array();

    $item['title'] = _parser_common_syndication_title($title, $body);

    $item['description'] = $body;

    $item['author_name'] = $original_author;

    if (!empty($news['pubDate'])) {

      $item['timestamp'] = _parser_common_syndication_parse_date($news['pubDate']);

    }

    elseif (!empty($dc['date'])) {

      $item['timestamp'] = _parser_common_syndication_parse_date($dc['date']);

    }

    else {

      $item['timestamp'] = time();

    }

    $item['url'] = trim($original_url);

    $item['guid'] = $guid;

    $item['geolocations'] = array();

    if (isset($geoname, $lat, $lon)) {

      $item['geolocations'] = array(

        array(

          'name' => $geoname,

          'lat' => $lat,

          'lon' => $lon,

        ),

      );

    }

    $item['domains'] = $additional_taxonomies['RSS Domains'];

    $item['tags'] = $additional_taxonomies['RSS Categories'];

    $parsed_source['items'][] = $item;

  }

  return $parsed_source;

}

/**

 * Parse a date comes from a feed.

 *

 * @param $date_string

 *  The date string in various formats.

 * @return

 *  The timestamp of the string or the current time if can't be parsed

 */

function _parser_common_syndication_parse_date($date_str) {

  // PHP < 5.3 doesn't like the GMT- notation for parsing timezones.

  $date_str = str_replace('GMT-', '-', $date_str);

  $date_str = str_replace('GMT+', '+', $date_str);

  $parsed_date = strtotime($date_str);

  if ($parsed_date === FALSE || $parsed_date == -1) {

    $parsed_date = _parser_common_syndication_parse_w3cdtf($date_str);

  }

  if (($parsed_date === FALSE || $parsed_date == -1)) {

    // PHP does not support the UT timezone. Fake it. The system that generated

    // this, Google Groups, probably meant UTC.

    $date_str = strtolower(trim($date_str));

    $last_three = substr($date_str, strlen($date_str) - 3, 3);

    if ($last_three == ' ut') {

      $parsed_date = strtotime($date_str . 'c');

    }

  }

  return $parsed_date === FALSE ? time() : $parsed_date;

}

/**

 * Parse the W3C date/time format, a subset of ISO 8601.

 *

 * PHP date parsing functions do not handle this format.

 * See http://www.w3.org/TR/NOTE-datetime for more information.

 * Originally from MagpieRSS (http://magpierss.sourceforge.net/).

 *

 * @param $date_str

 *   A string with a potentially W3C DTF date.

 * @return

 *   A timestamp if parsed successfully or FALSE if not.

 */

function _parser_common_syndication_parse_w3cdtf($date_str) {

  if (preg_match('/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})(:(\d{2}))?(?:([-+])(\d{2}):?(\d{2})|(Z))?/', $date_str, $match)) {

    list($year, $month, $day, $hours, $minutes, $seconds) = array($match[1], $match[2], $match[3], $match[4], $match[5], $match[6]);

    // Calculate the epoch for current date assuming GMT.

    $epoch = gmmktime($hours, $minutes, $seconds, $month, $day, $year);

    if ($match[10] != 'Z') { // Z is zulu time, aka GMT

      list($tz_mod, $tz_hour, $tz_min) = array($match[8], $match[9], $match[10]);

      // Zero out the variables.

      if (!$tz_hour) {

        $tz_hour = 0;

      }

      if (!$tz_min) {

        $tz_min = 0;

      }

      $offset_secs = (($tz_hour * 60) + $tz_min) * 60;

      // Is timezone ahead of GMT?  If yes, subtract offset.

      if ($tz_mod == '+') {

        $offset_secs *= -1;

      }

      $epoch += $offset_secs;

    }

    return $epoch;

  }

  else {

    return FALSE;

  }

}

/**

 * Extract the link that points to the original content (back to site or

 * original article)

 *

 * @param $links

 *  Array of SimpleXML objects

 */

function _parser_common_syndication_link($links) {

  $to_link = '';

  if (count($links) > 0) {

    foreach ($links as $link) {

      $link = $link->attributes();

      $to_link = isset($link["href"]) ? "{$link["href"]}" : "";

      if (isset($link["rel"])) {

        if ("{$link["rel"]}" == 'alternate') {

          break;

        }

      }

    }

  }

  return $to_link;

}

/**

 * Prepare raw data to be a title

 */

function _parser_common_syndication_title($title, $body = FALSE) {

  if (empty($title) && !empty($body)) {

    // Explode to words and use the first 3 words.

    $words = preg_split('/[\s,]+/', strip_tags($body));

    $title = implode(' ', array_slice($words, 0, 3));

  }

  return $title;

}