vjrj
9109581be0
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.
76 lines
2.7 KiB
Dart
76 lines
2.7 KiB
Dart
import 'dart:typed_data';
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import 'package:commons_core/commons_core.dart';
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/// The app-side entry point to the (Block 2) social layer.
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///
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/// Holds the user's Nostr identity — deterministically derived from the same
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/// root seed the recovery QR backs up (so it needs no extra backup) — and opens
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/// social sessions on demand. Local-first: constructing this is cheap and
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/// offline; nothing connects to a relay until [openSession] is called, so the
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/// app runs fully without network and the social layer only enriches.
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class SocialService {
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SocialService({required this.identity, List<String> relays = const []})
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: relays = List.unmodifiable(relays);
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/// The derived Nostr identity (secp256k1). Same key across reinstalls that
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/// restore the same seed.
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final NostrIdentity identity;
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/// Community relay URLs (may be empty — discovery/publishing degrade to
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/// nothing when offline or unconfigured).
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final List<String> relays;
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/// Shareable public identity (`npub…`) and its hex form.
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String get npub => identity.npub;
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String get publicKeyHex => identity.publicKeyHex;
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/// Derives the identity from the stored root-seed hex (32-byte, 64 chars).
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static Future<SocialService> fromRootSeedHex(
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String rootSeedHex, {
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List<String> relays = const [],
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}) async {
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final identity = await NostrKeyDerivation.deriveFromSeed(
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_hexToBytes(rootSeedHex),
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);
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return SocialService(identity: identity, relays: relays);
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}
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/// Opens a session against [relayUrls]: one fault-tolerant pool carrying all
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/// three transports (offers, messaging, trust). Relays that are down are
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/// skipped; throws only when none are reachable. Caller closes it.
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Future<SocialSession> openSession(List<String> relayUrls) async {
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final pool = await RelayPool.connect(relayUrls, identity: identity);
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return SocialSession(pool);
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}
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}
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/// One relay channel with the three transports on top — the
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/// "one channel, three interfaces" shape, at the app layer.
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class SocialSession {
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SocialSession(this._channel)
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: offers = NostrOfferTransport(_channel),
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messages = NostrMessageTransport(_channel),
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trust = NostrTrustTransport(_channel),
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profile = NostrProfileTransport(_channel);
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final NostrChannel _channel;
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final OfferTransport offers;
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final MessageTransport messages;
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final TrustTransport trust;
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final ProfileTransport profile;
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Future<void> close() => _channel.close();
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}
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Uint8List _hexToBytes(String hex) {
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if (hex.length.isOdd) {
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throw ArgumentError('hex string must have an even length');
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}
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final out = Uint8List(hex.length ~/ 2);
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for (var i = 0; i < out.length; i++) {
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out[i] = int.parse(hex.substring(i * 2, i * 2 + 2), radix: 16);
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}
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return out;
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}
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