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<?php
/**
* Expands an existing feed
*/
abstract class FeedExpander extends BridgeAbstract
{
private array $feed;
public function collectExpandableDatas(string $url, $maxItems = -1, $headers = [])
{
if (!$url) {
throw new \Exception('There is no $url for this RSS expander');
}
$maxItems = (int) $maxItems;
if ($maxItems === -1) {
$maxItems = 999;
}
$accept = [MrssFormat::MIME_TYPE, AtomFormat::MIME_TYPE, '*/*'];
$httpHeaders = array_merge(['Accept: ' . implode(', ', $accept)], $headers);
$xmlString = getContents($url, $httpHeaders);
if ($xmlString === '') {
throw new \Exception(sprintf('Unable to parse xml from `%s` because we got the empty string', $url), 10);
}
// prepare/massage the xml to make it more acceptable
$problematicStrings = [
' ',
'»',
'’',
];
$xmlString = str_replace($problematicStrings, '', $xmlString);
$feedParser = new FeedParser();
try {
$this->feed = $feedParser->parseFeed($xmlString);
} catch (\Exception $e) {
// FeedMergeBridge relies on this string
throw new \Exception(sprintf('Failed to parse xml from %s: %s', $url, create_sane_exception_message($e)));
}
$items = array_slice($this->feed['items'], 0, $maxItems);
// todo: extract parse logic out from FeedParser
foreach ($items as $item) {
// Give bridges a chance to modify the item
$item = $this->parseItem($item);
if ($item) {
$this->items[] = $item;
}
}
}
/**
* This method is overridden by bridges
*
* @return array
*/
protected function parseItem(array $item)
{
return $item;
}
public function getURI()
{
return $this->feed['uri'] ?? parent::getURI();
}
public function getName()
{
return $this->feed['title'] ?? parent::getName();
}
public function getIcon()
{
return $this->feed['icon'] ?? parent::getIcon();
}
}
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