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feat: read subscriptions from an Atom feed when a page lists no dated links

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randogoth 2026-10-11 13:35:19 +03:00
parent b0b86ef5b1
commit fa51d5793d
9 changed files with 411 additions and 4 deletions
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26
app/lib/application/controllers/subscriptions_controller.dart
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@ -43,9 +43,14 @@ class SubscriptionsController {
}
await _db.addSubscription(page.url, page.title, page.atomFeedHref);
subscribedUrls.value = {...subscribedUrls.value, page.url};
// The posts already on the page are the site's back catalogue, not news,
// so they are stored read and only later posts are flagged.
// Whatever the site has already published is its back catalogue, not
// news, so it is stored read and only later posts are flagged. A site
// that publishes only through a feed is seeded the same way.
await _db.addEntries(page.url, page.entries, read: true);
final feed = page.atomFeedHref;
if (page.entries.isEmpty && feed != null) {
await _checkFeed(page.url, feed, read: true);
}
}
Future<void> remove(String siteUrl) async {
@ -127,6 +132,13 @@ class SubscriptionsController {
await _db.describeSubscription(siteUrl,
title: page.title, atomHref: page.atomFeedHref);
await _db.addEntries(siteUrl, page.entries);
// Dated links are the normative way a site publishes (spec 6.1), so
// the feed is only read when the page itself listed nothing. A site
// where both agree is then fetched once, not twice.
final feed = page.atomFeedHref;
if (page.entries.isEmpty && feed != null) {
await _checkFeed(siteUrl, feed);
}
if (!notModified) {
// Keep the cache current so the site also reads offline, but do not
// record a visit: the reader did not open it.
@ -144,4 +156,14 @@ class SubscriptionsController {
}
await _db.touchSubscription(siteUrl, DateTime.now());
}
/// Reads a site's Atom feed (spec 6.2). Entries are keyed by address, so a
/// post listed by both the page and the feed is stored once.
Future<void> _checkFeed(String siteUrl, String feedUrl,
{bool read = false}) async {
final result = await _fetch.send(FetchFeed(url: feedUrl));
if (result case FetchFeedOk(:final entries)) {
await _db.addEntries(siteUrl, entries, read: read);
}
}
}