halkyon/packages/halkyon_app/test/shared_space/key_pins_test.dart

import 'dart:io';
import 'dart:typed_data';

import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_app/halkyon_app.dart';

/// The public keys a device pins for each person (Halkyon's ADR 0044, D18).
void main() {
  late Directory folder;
  late File file;

  PublicKeys keys(int mark) => (
    encryption: Uint8List.fromList(List.filled(32, mark)),
    signing: Uint8List.fromList(List.filled(32, mark + 1)),
  );

  setUp(() async {
    folder = await Directory.systemTemp.createTemp('key_pins');
    file = File('${folder.path}/person/key_pins.json');
  });

  tearDown(() => folder.delete(recursive: true));

  test('the first keys seen stay pinned, on the next start too; others '
      'are a change until trusted anew', () async {
    final pins = KeyPins(FileKeyPinStore(file));
    expect(await pins.check('bob', keys(1)), PinCheck.firstSeen);
    expect(await pins.check('bob', keys(1)), PinCheck.same);
    expect(await pins.check('bob', keys(3)), PinCheck.changed);

    final later = KeyPins(FileKeyPinStore(file));
    expect(await later.check('bob', keys(3)), PinCheck.changed);
    expect(await later.check('bob', keys(1)), PinCheck.same);

    await later.trustAnew('bob', keys(3));
    expect(
      await KeyPins(FileKeyPinStore(file)).check('bob', keys(3)),
      PinCheck.same,
    );
  });

  test('compared keys are marked so, until they are trusted anew', () async {
    final pins = KeyPins(FileKeyPinStore(file));
    await pins.check('bob', keys(1));
    expect((await pins.of('bob'))!.verified, isFalse);

    await pins.markVerified('bob');
    expect((await KeyPins(FileKeyPinStore(file)).of('bob'))!.verified, isTrue);

    await pins.trustAnew('bob', keys(3));
    expect((await pins.of('bob'))!.verified, isFalse);
  });

  test('a file not holding pins counts as none', () async {
    await file.parent.create(recursive: true);
    await file.writeAsString('{not json');
    var book = await FileKeyPinStore(file).read();
    expect(book.pins, isEmpty);
    expect(book.spaces, isEmpty);
    await file.writeAsString(
      '{"pins": {"bob": {"encryption": "%%", "signing": "", '
      '"verified": false, "earlierSigning": []}, "carol": 3}, '
      '"spaces": {"s": 4}}',
    );
    book = await FileKeyPinStore(file).read();
    expect(book.pins, isEmpty);
    expect(book.spaces, isEmpty);
  });

  test('signatures count in a space from everyone seen there, by every '
      'signing key pinned for them, earlier ones too (D20)', () async {
    final pins = KeyPins(FileKeyPinStore(file));
    await pins.check('bob', keys(1));
    await pins.check('carol', keys(5));
    await pins.check('mallory', keys(9));
    await pins.sawIn('space', ['bob', 'carol']);
    await pins.trustAnew('bob', keys(3));

    final later = KeyPins(FileKeyPinStore(file));
    final signers = await later.signersIn('space');
    expect(
      signers,
      unorderedEquals([keys(3).signing, keys(1).signing, keys(5).signing]),
    );
    expect(signers, isNot(contains(keys(9).signing)));
    expect(await later.signersIn('elsewhere'), isEmpty);
  });

  test(
    'someone gone from a space still counts for what they signed there',
    () async {
      final pins = KeyPins(FileKeyPinStore(file));
      await pins.check('bob', keys(1));
      await pins.sawIn('space', ['bob']);
      await pins.sawIn('space', <String>[]);
      expect(await pins.signersIn('space'), [keys(1).signing]);
    },
  );

  test('a seen person without pinned keys counts for nothing', () async {
    final pins = KeyPins(FileKeyPinStore(file));
    await pins.sawIn('space', ['bob']);
    expect(await pins.signersIn('space'), isEmpty);
  });
}