fluffychat/lib/pages/chat_encryption_settings/chat_encryption_settings_view.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

import 'package:flutter_gen/gen_l10n/l10n.dart';
import 'package:matrix/matrix.dart';
import 'package:url_launcher/url_launcher_string.dart';
import 'package:vrouter/vrouter.dart';

import 'package:fluffychat/config/app_config.dart';
import 'package:fluffychat/pages/chat_encryption_settings/chat_encryption_settings.dart';
import 'package:fluffychat/utils/beautify_string_extension.dart';

class ChatEncryptionSettingsView extends StatelessWidget {
  final ChatEncryptionSettingsController controller;

  const ChatEncryptionSettingsView(this.controller, {Key? key})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    final room = controller.room;
    return StreamBuilder<Object>(
      stream: room.client.onSync.stream.where(
        (s) => s.rooms?.join?[room.id] != null || s.deviceLists != null,
      ),
      builder: (context, _) => Scaffold(
        appBar: AppBar(
          leading: IconButton(
            icon: const Icon(Icons.close_outlined),
            onPressed: () =>
                VRouter.of(context).toSegments(['rooms', controller.roomId!]),
          ),
          title: Text(L10n.of(context)!.encryption),
          actions: [
            TextButton(
              onPressed: () => launchUrlString(AppConfig.encryptionTutorial),
              child: Text(L10n.of(context)!.help),
            ),
          ],
        ),
        body: ListView(
          children: [
            SwitchListTile(
              secondary: CircleAvatar(
                foregroundColor:
                    Theme.of(context).colorScheme.onPrimaryContainer,
                backgroundColor: Theme.of(context).colorScheme.primaryContainer,
                child: const Icon(Icons.lock_outlined),
              ),
              title: Text(L10n.of(context)!.encryptThisChat),
              value: room.encrypted,
              onChanged: controller.enableEncryption,
            ),
            Icon(
              CupertinoIcons.lock_shield,
              size: 128,
              color: Theme.of(context).colorScheme.onInverseSurface,
            ),
            const Divider(),
            if (room.isDirectChat)
              Padding(
                padding: const EdgeInsets.all(16.0),
                child: SizedBox(
                  width: double.infinity,
                  child: ElevatedButton.icon(
                    onPressed: controller.startVerification,
                    icon: const Icon(Icons.verified_outlined),
                    label: Text(L10n.of(context)!.verifyStart),
                  ),
                ),
              ),
            if (room.encrypted) ...[
              const SizedBox(height: 16),
              ListTile(
                title: Text(
                  L10n.of(context)!.deviceKeys,
                  style: const TextStyle(
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
              StreamBuilder(
                stream: room.onUpdate.stream,
                builder: (context, snapshot) => FutureBuilder<List<DeviceKeys>>(
                  future: room.getUserDeviceKeys(),
                  builder: (BuildContext context, snapshot) {
                    if (snapshot.hasError) {
                      return Center(
                        child: Text(
                          '${L10n.of(context)!.oopsSomethingWentWrong}: ${snapshot.error}',
                        ),
                      );
                    }
                    if (!snapshot.hasData) {
                      return const Center(
                        child: CircularProgressIndicator.adaptive(
                          strokeWidth: 2,
                        ),
                      );
                    }
                    final deviceKeys = snapshot.data!;
                    return ListView.builder(
                      shrinkWrap: true,
                      physics: const NeverScrollableScrollPhysics(),
                      itemCount: deviceKeys.length,
                      itemBuilder: (BuildContext context, int i) =>
                          SwitchListTile(
                        value: !deviceKeys[i].blocked,
                        activeColor: deviceKeys[i].verified
                            ? Colors.green
                            : Colors.orange,
                        onChanged: (_) =>
                            controller.toggleDeviceKey(deviceKeys[i]),
                        title: Row(
                          children: [
                            Icon(
                              deviceKeys[i].verified
                                  ? Icons.verified_outlined
                                  : deviceKeys[i].blocked
                                      ? Icons.block_outlined
                                      : Icons.info_outlined,
                              color: deviceKeys[i].verified
                                  ? Colors.green
                                  : deviceKeys[i].blocked
                                      ? Colors.red
                                      : Colors.orange,
                              size: 20,
                            ),
                            const SizedBox(width: 4),
                            Text(
                              deviceKeys[i].deviceId ??
                                  L10n.of(context)!.unknownDevice,
                            ),
                            const SizedBox(width: 4),
                            Flexible(
                              fit: FlexFit.loose,
                              child: Material(
                                shape: RoundedRectangleBorder(
                                  borderRadius: BorderRadius.circular(
                                    AppConfig.borderRadius,
                                  ),
                                  side: BorderSide(
                                    color:
                                        Theme.of(context).colorScheme.primary,
                                  ),
                                ),
                                color: Theme.of(context)
                                    .colorScheme
                                    .primaryContainer,
                                child: Padding(
                                  padding: const EdgeInsets.all(4.0),
                                  child: Text(
                                    deviceKeys[i].userId,
                                    maxLines: 1,
                                    overflow: TextOverflow.ellipsis,
                                    style: TextStyle(
                                      color:
                                          Theme.of(context).colorScheme.primary,
                                      fontSize: 12,
                                      fontStyle: FontStyle.italic,
                                    ),
                                  ),
                                ),
                              ),
                            ),
                          ],
                        ),
                        subtitle: Text(
                          deviceKeys[i].ed25519Key?.beautified ??
                              L10n.of(context)!.unknownEncryptionAlgorithm,
                          style: TextStyle(
                            fontFamily: 'RobotoMono',
                            color: Theme.of(context).colorScheme.secondary,
                          ),
                        ),
                      ),
                    );
                  },
                ),
              ),
            ] else
              Padding(
                padding: const EdgeInsets.all(16.0),
                child: Center(
                  child: Text(
                    L10n.of(context)!.encryptionNotEnabled,
                    style: const TextStyle(
                      fontStyle: FontStyle.italic,
                    ),
                  ),
                ),
              ),
          ],
        ),
      ),
    );
  }
}