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Further refinment to OPDS/RSS generation and also add Atom feeds

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This commit is contained in:
Alex Cabal 2022-06-23 15:03:52 -05:00
parent d75d847004
commit f9fd6c8a02
23 changed files with 733 additions and 859 deletions
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76
lib/AtomFeed.php
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@ -8,39 +8,19 @@ use function Safe\unlink;
class AtomFeed extends Feed{
public $Id;
public $Updated = null;
public $Subtitle = null;
public function __construct(string $url, string $title, string $path, array $entries){
parent::__construct($url, $title, $path, $entries);
$this->Id = 'https://standardebooks.org' . $url;
}
private function Sha1Entries(string $xmlString): string{
try{
$xml = new SimpleXMLElement(str_replace('xmlns=', 'ns=', $xmlString));
$xml->registerXPathNamespace('dc', 'http://purl.org/dc/elements/1.1/');
$xml->registerXPathNamespace('schema', 'http://schema.org/');
// Remove any <updated> elements, we don't want to compare against those.
foreach($xml->xpath('/feed/updated') ?: [] as $element){
unset($element[0]);
}
$output = '';
foreach($xml->xpath('/feed/entry') ?: [] as $entry){
$output .= $entry->asXml();
}
return sha1(preg_replace('/\s/ius', '', $output));
}
catch(Exception $ex){
// Invalid XML
return '';
}
public function __construct(string $title, string $subtitle, string $url, string $path, array $entries){
parent::__construct($title, $url, $path, $entries);
$this->Subtitle = $subtitle;
$this->Id = $url;
$this->Stylesheet = '/atom/style';
}
protected function GetXmlString(): string{
if($this->XmlString === null){
$feed = Template::AtomFeed(['id' => $this->Id, 'url' => $this->Url, 'title' => $this->Title, 'entries' => $this->Entries]);
$feed = Template::AtomFeed(['id' => $this->Id, 'url' => $this->Url, 'title' => $this->Title, 'subtitle' => $this->Subtitle, 'updatedTimestamp' => $this->Updated, 'entries' => $this->Entries]);
$this->XmlString = $this->CleanXmlString($feed);
}
@ -49,6 +29,44 @@ class AtomFeed extends Feed{
}
protected function HasChanged(string $path): bool{
return !is_file($path) || ($this->Sha1Entries($this->GetXmlString()) != $this->Sha1Entries(file_get_contents($path)));
if(!is_file($path)){
return true;
}
$currentEntries = [];
foreach($this->Entries as $entry){
$obj = new StdClass();
if(is_a($entry, 'Ebook')){
$obj->Updated = $entry->ModifiedTimestamp->format('Y-m-d\TH:i:s\Z');
$obj->Id = SITE_URL . $entry->Url;
}
else{
$obj->Updated = $entry->Updated !== null ? $entry->Updated->format('Y-m-d\TH:i:s\Z') : '';
$obj->Id = $entry->Id;
}
$currentEntries[] = $obj;
}
$oldEntries = [];
try{
$xml = new SimpleXMLElement(str_replace('xmlns=', 'ns=', file_get_contents($path)));
foreach($xml->xpath('/feed/entry') ?: [] as $entry){
$obj = new StdClass();
$obj->Updated = $entry->updated;
$obj->Id = $entry->id;
$oldEntries[] = $obj;
}
}
catch(Exception $ex){
// Invalid XML
return true;
}
return $currentEntries != $oldEntries;
}
public function Save(): void{
parent::Save();
}
}