Rss-Bridge/lib/FeedExpander.php

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<?php
require_once(__DIR__ . '/BridgeInterface.php');
abstract class FeedExpander extends HttpCachingBridgeAbstract {
private $name;
private $uri;
private $description;
public function collectExpandableDatas($url, $maxItems = -1){
if(empty($url)){
$this->returnServerError('There is no $url for this RSS expander');
}
$this->debugMessage('Loading from ' . $url);
/* Notice we do not use cache here on purpose:
* we want a fresh view of the RSS stream each time
*/
$content = $this->getContents($url)
or $this->returnServerError('Could not request ' . $url);
$rssContent = simplexml_load_string($content);
$this->debugMessage('Detecting feed format/version');
if(isset($rssContent->channel[0])){
$this->debugMessage('Detected RSS format');
if(isset($rssContent->item[0])){
$this->debugMessage('Detected RSS 1.0 format');
$this->collect_RSS_1_0_data($rssContent, $maxItems);
} else {
$this->debugMessage('Detected RSS 0.9x or 2.0 format');
$this->collect_RSS_2_0_data($rssContent, $maxItems);
}
} elseif(isset($rssContent->entry[0])){
$this->debugMessage('Detected ATOM format');
$this->collect_ATOM_data($rssContent, $maxItems);
} else {
$this->debugMessage('Unknown feed format/version');
$this->returnServerError('The feed format is unknown!');
}
}
protected function collect_RSS_1_0_data($rssContent, $maxItems){
$this->load_RSS_2_0_feed_data($rssContent->channel[0]);
foreach($rssContent->item as $item){
$this->debugMessage('parsing item ' . var_export($item, true));
$this->items[] = $this->parseItem($item);
if($maxItems !== -1 && count($this->items) >= $maxItems) break;
}
}
protected function collect_RSS_2_0_data($rssContent, $maxItems){
$rssContent = $rssContent->channel[0];
$this->debugMessage('RSS content is ===========\n' . var_export($rssContent, true) . '===========');
$this->load_RSS_2_0_feed_data($rssContent);
foreach($rssContent->item as $item){
$this->debugMessage('parsing item ' . var_export($item, true));
$this->items[] = $this->parseItem($item);
if($maxItems !== -1 && count($this->items) >= $maxItems) break;
}
}
protected function collect_ATOM_data($content, $maxItems){
$this->load_ATOM_feed_data($content);
foreach($content->entry as $item){
$this->debugMessage('parsing item ' . var_export($item, true));
$this->items[] = $this->parseItem($item);
if($maxItems !== -1 && count($this->items) >= $maxItems) break;
}
}
protected function RSS_2_0_time_to_timestamp($item){
return DateTime::createFromFormat('D, d M Y H:i:s e', $item->pubDate)->getTimestamp();
}
// TODO set title, link, description, language, and so on
protected function load_RSS_2_0_feed_data($rssContent){
$this->name = trim($rssContent->title);
$this->uri = trim($rssContent->link);
$this->description = trim($rssContent->description);
}
protected function load_ATOM_feed_data($content){
$this->name = $content->title;
// Find best link (only one, or first of 'alternate')
if(!isset($content->link)){
$this->uri = '';
} elseif (count($content->link) === 1){
$this->uri = $content->link[0]['href'];
} else {
$this->uri = '';
foreach($content->link as $link){
if(strtolower($link['rel']) === 'alternate'){
$this->uri = $link['href'];
break;
}
}
}
if(isset($content->subtitle))
$this->description = $content->subtitle;
}
protected function parseATOMItem($feedItem){
$item = array();
if(isset($feedItem->id)) $item['uri'] = $feedItem->id;
if(isset($feedItem->title)) $item['title'] = $feedItem->title;
if(isset($feedItem->updated)) $item['timestamp'] = strtotime($feedItem->updated);
if(isset($feedItem->author)) $item['author'] = $feedItem->author->name;
if(isset($feedItem->content)) $item['content'] = $feedItem->content;
return $item;
}
protected function parseRSS_0_9_1_Item($feedItem){
$item = array();
if(isset($feedItem->link)) $item['uri'] = $feedItem->link;
if(isset($feedItem->title)) $item['title'] = $feedItem->title;
// rss 0.91 doesn't support timestamps
// rss 0.91 doesn't support authors
if(isset($feedItem->description)) $item['content'] = $feedItem->description;
return $item;
}
protected function parseRSS_1_0_Item($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)) $item['timestamp'] = strtotime($dc->date);
if(isset($dc->creator)) $item['author'] = $dc->creator;
}
return $item;
}
protected function parseRSS_2_0_Item($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($feedItem->pubDate)){
$item['timestamp'] = strtotime($feedItem->pubDate);
} elseif(isset($dc->date)){
$item['timestamp'] = strtotime($dc->date);
}
if(isset($feedItem->author)){
$item['author'] = $feedItem->author;
} elseif(isset($dc->creator)){
$item['author'] = $dc->creator;
}
return $item;
}
/**
* Method should return, from a source RSS item given by lastRSS, one of our Items objects
* @param $item the input rss item
* @return a RSS-Bridge Item, with (hopefully) the whole content)
*/
abstract protected function parseItem($item);
public function getURI(){
return $this->uri;
}
public function getName(){
return $this->name;
}
public function getDescription(){
return $this->description;
}
}