item[0]): Debug::log('Detected RSS 1.0 format'); $this->feedType = self::FEED_TYPE_RSS_1_0; break; case isset($rssContent->channel[0]): Debug::log('Detected RSS 0.9x or 2.0 format'); $this->feedType = self::FEED_TYPE_RSS_2_0; break; case isset($rssContent->entry[0]): Debug::log('Detected ATOM format'); $this->feedType = self::FEED_TYPE_ATOM_1_0; break; default: Debug::log('Unknown feed format/version'); returnServerError('The feed format is unknown!'); break; } Debug::log('Calling function "collect_' . $this->feedType . '_data"'); $this->{'collect_' . $this->feedType . '_data'}($rssContent, $maxItems); return $this; } /** * Collect data from a RSS 1.0 compatible feed * * @link http://web.resource.org/rss/1.0/spec RDF Site Summary (RSS) 1.0 * * @param string $rssContent The RSS content * @param int $maxItems Maximum number of items to collect from the feed * (`-1`: no limit). * @return void * * @todo Instead of passing $maxItems to all functions, just add all items * and remove excessive items later. */ protected function collect_RSS_1_0_data($rssContent, $maxItems){ $this->load_RSS_2_0_feed_data($rssContent->channel[0]); foreach($rssContent->item as $item) { Debug::log('parsing item ' . var_export($item, true)); $tmp_item = $this->parseItem($item); if (!empty($tmp_item)) { $this->items[] = $tmp_item; } if($maxItems !== -1 && count($this->items) >= $maxItems) break; } } /** * Collect data from a RSS 2.0 compatible feed * * @link http://www.rssboard.org/rss-specification RSS 2.0 Specification * * @param object $rssContent The RSS content * @param int $maxItems Maximum number of items to collect from the feed * (`-1`: no limit). * @return void * * @todo Instead of passing $maxItems to all functions, just add all items * and remove excessive items later. */ protected function collect_RSS_2_0_data($rssContent, $maxItems){ $rssContent = $rssContent->channel[0]; Debug::log('RSS content is ===========\n' . var_export($rssContent, true) . '==========='); $this->load_RSS_2_0_feed_data($rssContent); foreach($rssContent->item as $item) { Debug::log('parsing item ' . var_export($item, true)); $tmp_item = $this->parseItem($item); if (!empty($tmp_item)) { $this->items[] = $tmp_item; } if($maxItems !== -1 && count($this->items) >= $maxItems) break; } } /** * Collect data from a Atom 1.0 compatible feed * * @link https://tools.ietf.org/html/rfc4287 The Atom Syndication Format * * @param object $content The Atom content * @param int $maxItems Maximum number of items to collect from the feed * (`-1`: no limit). * @return void * * @todo Instead of passing $maxItems to all functions, just add all items * and remove excessive items later. */ protected function collect_ATOM_1_0_data($content, $maxItems){ $this->load_ATOM_feed_data($content); foreach($content->entry as $item) { Debug::log('parsing item ' . var_export($item, true)); $tmp_item = $this->parseItem($item); if (!empty($tmp_item)) { $this->items[] = $tmp_item; } if($maxItems !== -1 && count($this->items) >= $maxItems) break; } } /** * Convert RSS 2.0 time to timestamp * * @param object $item A feed item * @return int The timestamp */ protected function RSS_2_0_time_to_timestamp($item){ return DateTime::createFromFormat('D, d M Y H:i:s e', $item->pubDate)->getTimestamp(); } /** * Load RSS 2.0 feed data into RSS-Bridge * * @param object $rssContent The RSS content * @return void * * @todo set title, link, description, language, and so on */ protected function load_RSS_2_0_feed_data($rssContent){ $this->title = trim((string)$rssContent->title); $this->uri = trim((string)$rssContent->link); } /** * Load Atom feed data into RSS-Bridge * * @param object $content The Atom content * @return void */ protected function load_ATOM_feed_data($content){ $this->title = (string)$content->title; // Find best link (only one, or first of 'alternate') if(!isset($content->link)) { $this->uri = ''; } elseif (count($content->link) === 1) { $this->uri = (string)$content->link[0]['href']; } else { $this->uri = ''; foreach($content->link as $link) { if(strtolower($link['rel']) === 'alternate') { $this->uri = (string)$link['href']; break; } } } } /** * Parse the contents of a single Atom feed item into a RSS-Bridge item for * further transformation. * * @param object $feedItem A single feed item * @return object The RSS-Bridge item * * @todo To reduce confusion, the RSS-Bridge item should maybe have a class * of its own? */ protected function parseATOMItem($feedItem){ // Some ATOM entries also contain RSS 2.0 fields $item = $this->parseRSS_2_0_Item($feedItem); if(isset($feedItem->id)) $item['uri'] = (string)$feedItem->id; if(isset($feedItem->title)) $item['title'] = (string)$feedItem->title; if(isset($feedItem->updated)) $item['timestamp'] = strtotime((string)$feedItem->updated); if(isset($feedItem->author)) $item['author'] = (string)$feedItem->author->name; if(isset($feedItem->content)) $item['content'] = (string)$feedItem->content; //When "link" field is present, URL is more reliable than "id" field if (count($feedItem->link) === 1) { $item['uri'] = (string)$feedItem->link[0]['href']; } else { foreach($feedItem->link as $link) { if(strtolower($link['rel']) === 'alternate') { $item['uri'] = (string)$link['href']; } if(strtolower($link['rel']) === 'enclosure') { $item['enclosures'][] = (string)$link['href']; } } } return $item; } /** * Parse the contents of a single RSS 0.91 feed item into a RSS-Bridge item * for further transformation. * * @param object $feedItem A single feed item * @return object The RSS-Bridge item * * @todo To reduce confusion, the RSS-Bridge item should maybe have a class * of its own? */ protected function parseRSS_0_9_1_Item($feedItem){ $item = array(); if(isset($feedItem->link)) $item['uri'] = (string)$feedItem->link; if(isset($feedItem->title)) $item['title'] = (string)$feedItem->title; // rss 0.91 doesn't support timestamps // rss 0.91 doesn't support authors // rss 0.91 doesn't support enclosures if(isset($feedItem->description)) $item['content'] = (string)$feedItem->description; return $item; } /** * Parse the contents of a single RSS 1.0 feed item into a RSS-Bridge item * for further transformation. * * @param object $feedItem A single feed item * @return object The RSS-Bridge item * * @todo To reduce confusion, the RSS-Bridge item should maybe have a class * of its own? */ protected function parseRSS_1_0_Item($feedItem){ // 1.0 adds optional elements around the 0.91 standard $item = $this->parseRSS_0_9_1_Item($feedItem); $namespaces = $feedItem->getNamespaces(true); if(isset($namespaces['dc'])) { $dc = $feedItem->children($namespaces['dc']); if(isset($dc->date)) $item['timestamp'] = strtotime((string)$dc->date); if(isset($dc->creator)) $item['author'] = (string)$dc->creator; } return $item; } /** * Parse the contents of a single RSS 2.0 feed item into a RSS-Bridge item * for further transformation. * * @param object $feedItem A single feed item * @return object The RSS-Bridge item * * @todo To reduce confusion, the RSS-Bridge item should maybe have a class * of its own? */ protected function parseRSS_2_0_Item($feedItem){ // Primary data is compatible to 0.91 with some additional data $item = $this->parseRSS_0_9_1_Item($feedItem); $namespaces = $feedItem->getNamespaces(true); if(isset($namespaces['dc'])) $dc = $feedItem->children($namespaces['dc']); if(isset($namespaces['media'])) $media = $feedItem->children($namespaces['media']); if(isset($feedItem->guid)) { foreach($feedItem->guid->attributes() as $attribute => $value) { if($attribute === 'isPermaLink' && ($value === 'true' || ( filter_var($feedItem->guid, FILTER_VALIDATE_URL) && (empty($item['uri']) || !filter_var($item['uri'], FILTER_VALIDATE_URL)) ) ) ) { $item['uri'] = (string)$feedItem->guid; break; } } } if(isset($feedItem->pubDate)) { $item['timestamp'] = strtotime((string)$feedItem->pubDate); } elseif(isset($dc->date)) { $item['timestamp'] = strtotime((string)$dc->date); } if(isset($feedItem->author)) { $item['author'] = (string)$feedItem->author; } elseif (isset($feedItem->creator)) { $item['author'] = (string)$feedItem->creator; } elseif(isset($dc->creator)) { $item['author'] = (string)$dc->creator; } elseif(isset($media->credit)) { $item['author'] = (string)$media->credit; } if(isset($feedItem->enclosure) && !empty($feedItem->enclosure['url'])) { $item['enclosures'] = array((string)$feedItem->enclosure['url']); } return $item; } /** * Parse the contents of a single feed item, depending on the current feed * type, into a RSS-Bridge item. * * @param object $item The current feed item * @return object A RSS-Bridge item, with (hopefully) the whole content */ protected function parseItem($item){ switch($this->feedType) { case self::FEED_TYPE_RSS_1_0: return $this->parseRSS_1_0_Item($item); break; case self::FEED_TYPE_RSS_2_0: return $this->parseRSS_2_0_Item($item); break; case self::FEED_TYPE_ATOM_1_0: return $this->parseATOMItem($item); break; default: returnClientError('Unknown version ' . $this->getInput('version') . '!'); } } /** {@inheritdoc} */ public function getURI(){ return !empty($this->uri) ? $this->uri : parent::getURI(); } /** {@inheritdoc} */ public function getName(){ return !empty($this->title) ? $this->title : parent::getName(); } /** {@inheritdoc} */ public function getIcon(){ return !empty($this->icon) ? $this->icon : parent::getIcon(); } }