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feat(market): embed offer photos inline instead of a media server

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Replace the Blossom media-server approach with a fully decentralized one:
generate a small (~320px) JPEG thumbnail from the lot's cover photo and
embed it in the offer event as a data: URI, so photos ride the relays with
no server and no IP leak. The full photo stays in the encrypted inventory.

- offer_thumbnail.dart: downscale-until-it-fits data-URI builder + decoder
- market_widgets: render data: URIs from memory, http(s) URLs from network
- offers_cubit: publish a thumbnail (best-effort) in place of an upload
- drop MediaTransport/Blossom from commons_core (http/crypto deps) and the
  media-server setting; parked on branch parked/offer-photos-blossom

Relay event-size limits cap the image to a thumbnail; higher-res sharing
would need the parked Blossom path.
This commit is contained in:
vjrj 2026-07-10 21:27:59 +02:00
parent 5017ea51e0
commit 2b419e6516
24 changed files with 230 additions and 411 deletions
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39
apps/app_seeds/test/state/offers_cubit_test.dart
View file

@ -41,24 +41,6 @@ class FakeOfferTransport implements OfferTransport {
Future<void> close() async {}
}
/// In-memory [MediaTransport]: hands back a fixed URL, or throws when [fail] is
/// set (to prove the publish step degrades to no-image instead of erroring).
class FakeMediaTransport implements MediaTransport {
FakeMediaTransport({this.fail = false});
final bool fail;
int uploads = 0;
@override
Future<Uri> upload(Uint8List bytes, {required String mimeType}) async {
uploads++;
if (fail) throw const MediaUploadException('boom', 500);
return Uri.parse('https://media.test/hosted.jpg');
}
@override
Future<void> close() async {}
}
/// Emits every published offer TWICE on discover — the way a relay legitimately
/// resends an addressable event (a stored copy plus a live echo). Used to prove
/// the cubit dedups instead of doubling the listing.
@ -312,14 +294,17 @@ void main() {
await cubit.close();
});
test('publishLots hosts the cover photo and puts its URL on the offer',
test('publishLots embeds an inline thumbnail data-URI on the offer',
() async {
final transport = FakeOfferTransport();
final media = FakeMediaTransport();
var thumbnailed = 0;
final cubit = OffersCubit(
transport,
media: media,
coverPhoto: (id) async => Uint8List.fromList([1, 2, 3]),
thumbnail: (bytes) {
thumbnailed++;
return 'data:image/jpeg;base64,AAAA';
},
);
await cubit.publishLots(
const [
@ -336,18 +321,18 @@ void main() {
await cubit.discover('sp3');
await pumpEventQueue();
expect(media.uploads, 1);
expect(cubit.state.offers.single.imageUrl, 'https://media.test/hosted.jpg');
expect(thumbnailed, 1);
expect(cubit.state.offers.single.imageUrl, 'data:image/jpeg;base64,AAAA');
await cubit.close();
});
test('publishLots still publishes (without image) when hosting fails',
test('publishLots still publishes (without image) when thumbnailing fails',
() async {
final transport = FakeOfferTransport();
final cubit = OffersCubit(
transport,
media: FakeMediaTransport(fail: true),
coverPhoto: (id) async => Uint8List.fromList([1, 2, 3]),
thumbnail: (bytes) => throw Exception('boom'),
);
final count = await cubit.publishLots(
const [
@ -369,9 +354,9 @@ void main() {
await cubit.close();
});
test('publishLots without a media server publishes no image', () async {
test('publishLots without a thumbnailer publishes no image', () async {
final transport = FakeOfferTransport();
final cubit = OffersCubit(transport); // no media, no coverPhoto
final cubit = OffersCubit(transport); // no thumbnail, no coverPhoto
await cubit.publishLots(
const [
ShareableLot(