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Fix W3C validator errors in the Facebook feed proxy

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FetchRSS's raw feed fails validation: entry <id> is a bare Facebook post
ID rather than a full URI, and <link rel="self"> points at the FetchRSS
URL instead of where we actually serve it. Parse the fetched XML with
DOMDocument and fix both before caching/serving: reuse each entry's own
alternate link (already a full post URL) as its id, and rewrite the self
link to our own facebook.php URL.

Requires the php-xml extension (ext-dom) — near-universal on shared
hosting, but worth checking if this breaks on deploy.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
para
2026-09-26 00:23:02 +02:00
co-authored by Claude Sonnet 5
parent dac36592eb
commit 476c1bf413
1 changed files with 37 additions and 1 deletions
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php/facebook.php
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@@ -10,10 +10,46 @@ require __DIR__ . '/common.php';
* notre propre domaine pour avoir une URL stable a partager.
*/
const FETCHRSS_URL = 'https://fetchrss.com/feed/1xABzW0ZB9CM1xAByX0rYAhW.atom';
const SELF_URL = 'https://sillycone-village.be/silly-rss/facebook.php';
/**
* Le flux FetchRSS brut ne passe pas le validateur W3C :
* - <id> de chaque <entry> est l'identifiant numerique brut du post
* Facebook, alors que la spec Atom exige une URI complete. On reutilise
* le <link rel="alternate"> de l'entree (deja une URL complete vers le
* post) a la place.
* - Le <link rel="self"> pointe vers l'URL FetchRSS d'origine au lieu de
* celle ou ce flux est reellement servi.
*/
function fetch_facebook_feed(): string
{
return http_get(FETCHRSS_URL, ['Accept: application/atom+xml, application/xml']);
$raw = http_get(FETCHRSS_URL, ['Accept: application/atom+xml, application/xml']);
$doc = new DOMDocument();
if (!$doc->loadXML($raw)) {
return $raw; // XML illisible : on sert quand meme le brut plutot que de casser le flux
}
$atomNs = 'http://www.w3.org/2005/Atom';
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('a', $atomNs);
foreach ($xpath->query('/a:feed/a:link[@rel="self"]') as $selfLink) {
$selfLink->setAttribute('href', SELF_URL);
}
foreach ($xpath->query('/a:feed/a:entry') as $entry) {
$idNode = $xpath->query('a:id', $entry)->item(0);
$linkNode = $xpath->query('a:link[@rel="alternate"]', $entry)->item(0);
if ($idNode && $linkNode) {
$href = $linkNode->getAttribute('href');
if ($href && !preg_match('#^https?://#', $idNode->textContent)) {
$idNode->textContent = $href;
}
}
}
return $doc->saveXML();
}
// text/xml plutot que application/atom+xml : voir la note dans common.php