vjrj
2b419e6516
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.
61 lines
2.1 KiB
Dart
61 lines
2.1 KiB
Dart
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:image/image.dart' as img;
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import 'package:tane/services/offer_thumbnail.dart';
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void main() {
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/// A real, decodable photo far bigger than a thumbnail, with varied pixels so
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/// JPEG can't compress it to nothing.
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Uint8List bigPhoto() {
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final image = img.Image(width: 1280, height: 960);
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for (var y = 0; y < image.height; y++) {
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for (var x = 0; x < image.width; x++) {
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image.setPixelRgb(x, y, (x * 7) % 256, (y * 5) % 256, (x + y) % 256);
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}
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}
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return img.encodeJpg(image, quality: 90);
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}
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test('produces a small jpeg data-URI that fits the byte budget', () {
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final uri = offerThumbnailDataUri(bigPhoto(), maxBytes: 40000);
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expect(uri, isNotNull);
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expect(uri!, startsWith('data:image/jpeg;base64,'));
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final b64 = uri.substring('data:image/jpeg;base64,'.length);
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expect(b64.length, lessThanOrEqualTo(40000));
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// The payload really is a smaller image than the source.
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final decoded = img.decodeJpg(base64.decode(b64))!;
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expect(decoded.width, lessThanOrEqualTo(320));
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expect(decoded.height, lessThanOrEqualTo(320));
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});
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test('never upscales an already-tiny image', () {
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final small = img.encodeJpg(img.Image(width: 64, height: 48), quality: 80);
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final uri = offerThumbnailDataUri(small);
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expect(uri, isNotNull);
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final b64 = uri!.substring('data:image/jpeg;base64,'.length);
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final decoded = img.decodeJpg(base64.decode(b64))!;
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expect(decoded.width, 64);
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expect(decoded.height, 48);
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});
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test('returns null for bytes that are not an image', () {
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expect(offerThumbnailDataUri(Uint8List.fromList([1, 2, 3, 4])), isNull);
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});
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group('decodeDataUri', () {
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test('round-trips a base64 data URI to its bytes', () {
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final bytes = Uint8List.fromList([9, 8, 7, 6]);
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final uri = 'data:image/jpeg;base64,${base64.encode(bytes)}';
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expect(decodeDataUri(uri), bytes);
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});
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test('returns null for a plain http url', () {
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expect(decodeDataUri('https://example.org/a.jpg'), isNull);
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});
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});
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}
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