389 lines
13 KiB
Dart
389 lines
13 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:web_socket_channel/web_socket_channel.dart';
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import 'package:xterm/xterm.dart';
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import '../../../../core/config/api_endpoints.dart';
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import '../../../../core/config/app_config.dart';
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import '../../../../core/network/dio_client.dart';
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import '../../../../core/theme/app_colors.dart';
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import '../../../auth/data/providers/auth_provider.dart';
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// ---------------------------------------------------------------------------
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// TODO 2E – Remote Terminal page: xterm + WebSocket
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// ---------------------------------------------------------------------------
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/// Fetches the list of servers for the server-selector dropdown.
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final _terminalServersProvider =
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FutureProvider<List<Map<String, dynamic>>>((ref) async {
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final dio = ref.watch(dioClientProvider);
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final response = await dio.get(ApiEndpoints.servers);
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final data = response.data;
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if (data is List) return data.cast<Map<String, dynamic>>();
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if (data is Map && data.containsKey('items')) {
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return (data['items'] as List).cast<Map<String, dynamic>>();
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}
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return [];
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});
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// ---------------------------------------------------------------------------
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// Connection status enum
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// ---------------------------------------------------------------------------
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enum _ConnectionStatus { disconnected, connecting, connected }
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// ---------------------------------------------------------------------------
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// Terminal page – ConsumerStatefulWidget
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// ---------------------------------------------------------------------------
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class TerminalPage extends ConsumerStatefulWidget {
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const TerminalPage({super.key});
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@override
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ConsumerState<TerminalPage> createState() => _TerminalPageState();
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}
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class _TerminalPageState extends ConsumerState<TerminalPage> {
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late final Terminal _terminal;
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WebSocketChannel? _channel;
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StreamSubscription? _wsSubscription;
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_ConnectionStatus _status = _ConnectionStatus.disconnected;
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String? _selectedServerId;
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@override
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void initState() {
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super.initState();
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_terminal = Terminal(maxLines: 10000);
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_terminal.onOutput = _onTerminalInput;
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_terminal.write('iAgent 远程终端\r\n');
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_terminal.write('请选择服务器并点击连接。\r\n');
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}
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@override
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void dispose() {
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_disconnect();
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super.dispose();
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}
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// ---------- WebSocket lifecycle ------------------------------------------
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Future<void> _connect() async {
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if (_selectedServerId == null || _selectedServerId!.isEmpty) {
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_terminal.write('\r\n\x1B[33m[!] 请先选择服务器\x1B[0m\r\n');
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return;
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}
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setState(() => _status = _ConnectionStatus.connecting);
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_terminal.write('\r\n\x1B[33m[*] 正在连接服务器 $_selectedServerId...\x1B[0m\r\n');
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try {
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final config = ref.read(appConfigProvider);
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final storage = ref.read(secureStorageProvider);
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final token = await storage.read(key: 'access_token');
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final queryParams = <String, String>{
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'serverId': _selectedServerId!,
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};
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if (token != null) {
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queryParams['token'] = token;
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}
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final uri = Uri.parse(
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'${config.wsBaseUrl}${ApiEndpoints.wsTerminal}',
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).replace(queryParameters: queryParams);
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_channel = WebSocketChannel.connect(uri);
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// Wait for the connection to be ready
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await _channel!.ready;
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_wsSubscription = _channel!.stream.listen(
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_onWsMessage,
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onDone: _onWsDone,
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onError: _onWsError,
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);
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if (mounted) {
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setState(() => _status = _ConnectionStatus.connected);
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_terminal.write('\x1B[32m[+] 已连接\x1B[0m\r\n');
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}
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} catch (e) {
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if (mounted) {
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setState(() => _status = _ConnectionStatus.disconnected);
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_terminal.write('\x1B[31m[-] 连接失败: $e\x1B[0m\r\n');
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}
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}
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}
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void _disconnect() {
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_wsSubscription?.cancel();
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_wsSubscription = null;
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_channel?.sink.close();
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_channel = null;
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if (mounted) {
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setState(() => _status = _ConnectionStatus.disconnected);
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}
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}
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// ---------- WebSocket message handlers -----------------------------------
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void _onWsMessage(dynamic data) {
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if (data is String) {
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// Try decoding as JSON first (server may wrap output in a message
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// envelope like {"type":"output","data":"..."}).
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try {
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final decoded = jsonDecode(data) as Map<String, dynamic>;
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final output = decoded['data'] as String? ?? decoded['output'] as String? ?? '';
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if (output.isNotEmpty) {
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_terminal.write(output);
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}
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} catch (_) {
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// Not JSON – treat as raw terminal output.
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_terminal.write(data);
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}
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}
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}
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void _onWsDone() {
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if (mounted) {
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setState(() => _status = _ConnectionStatus.disconnected);
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_terminal.write('\r\n\x1B[33m[*] 连接已关闭\x1B[0m\r\n');
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}
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}
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void _onWsError(dynamic error) {
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if (mounted) {
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setState(() => _status = _ConnectionStatus.disconnected);
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_terminal.write('\r\n\x1B[31m[-] WebSocket 错误: $error\x1B[0m\r\n');
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}
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}
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// ---------- Terminal input handler ----------------------------------------
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void _onTerminalInput(String data) {
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if (_status != _ConnectionStatus.connected || _channel == null) {
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return;
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}
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// Send raw input to the server via WebSocket.
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_channel!.sink.add(jsonEncode({'type': 'input', 'data': data}));
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}
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// ---------- UI helpers ---------------------------------------------------
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Color get _statusColor {
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switch (_status) {
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case _ConnectionStatus.connected:
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return AppColors.success;
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case _ConnectionStatus.connecting:
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return AppColors.warning;
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case _ConnectionStatus.disconnected:
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return AppColors.error;
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}
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}
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String get _statusLabel {
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switch (_status) {
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case _ConnectionStatus.connected:
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return '已连接';
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case _ConnectionStatus.connecting:
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return '连接中...';
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case _ConnectionStatus.disconnected:
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return '未连接';
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}
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}
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// ---------- Build --------------------------------------------------------
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@override
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Widget build(BuildContext context) {
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final serversAsync = ref.watch(_terminalServersProvider);
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return Scaffold(
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appBar: AppBar(
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title: const Text('远程终端'),
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actions: [
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// Connection status indicator
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Padding(
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padding: const EdgeInsets.only(right: 8),
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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Container(
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width: 10,
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height: 10,
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decoration: BoxDecoration(
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color: _statusColor,
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shape: BoxShape.circle,
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),
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),
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const SizedBox(width: 6),
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Text(
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_statusLabel,
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style: TextStyle(
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color: _statusColor,
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fontSize: 12,
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fontWeight: FontWeight.w500,
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),
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),
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],
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),
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),
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// Reconnect / Disconnect button
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if (_status == _ConnectionStatus.disconnected)
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IconButton(
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icon: const Icon(Icons.refresh),
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tooltip: '重新连接',
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onPressed: _selectedServerId != null ? _connect : null,
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)
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else if (_status == _ConnectionStatus.connected)
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IconButton(
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icon: const Icon(Icons.link_off),
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tooltip: '断开连接',
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onPressed: () {
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_disconnect();
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_terminal.write('\r\n\x1B[33m[*] 已断开连接\x1B[0m\r\n');
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},
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),
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],
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),
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body: Column(
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children: [
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// ---- Server selector bar ----------------------------------------
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Container(
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color: AppColors.surface,
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
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child: Row(
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children: [
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const Icon(Icons.dns, size: 20, color: AppColors.textSecondary),
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const SizedBox(width: 8),
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Expanded(
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child: serversAsync.when(
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data: (servers) {
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if (servers.isEmpty) {
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return const Text(
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'暂无可用服务器',
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style: TextStyle(
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color: AppColors.textMuted,
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fontSize: 14,
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),
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);
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}
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return DropdownButtonHideUnderline(
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child: DropdownButton<String>(
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value: _selectedServerId,
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hint: const Text(
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'选择服务器...',
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style: TextStyle(
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color: AppColors.textMuted,
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fontSize: 14,
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),
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),
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isExpanded: true,
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dropdownColor: AppColors.surface,
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style: const TextStyle(
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color: AppColors.textPrimary,
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fontSize: 14,
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),
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items: servers.map((s) {
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final id = s['id']?.toString() ?? '';
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final hostname =
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s['hostname'] as String? ?? s['name'] as String? ?? id;
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final ip = s['ip'] as String? ?? s['address'] as String? ?? '';
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return DropdownMenuItem(
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value: id,
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child: Text(
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ip.isNotEmpty ? '$hostname ($ip)' : hostname,
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overflow: TextOverflow.ellipsis,
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),
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);
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}).toList(),
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onChanged: _status == _ConnectionStatus.connected
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? null
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: (value) {
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setState(() => _selectedServerId = value);
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},
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),
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);
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},
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loading: () => const SizedBox(
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height: 20,
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child: LinearProgressIndicator(),
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),
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error: (e, _) => Row(
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children: [
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const Icon(Icons.error_outline,
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size: 16, color: AppColors.error),
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const SizedBox(width: 6),
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Expanded(
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child: Text(
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'加载服务器失败',
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style: const TextStyle(
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color: AppColors.error,
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fontSize: 13,
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),
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),
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),
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IconButton(
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icon: const Icon(Icons.refresh, size: 18),
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onPressed: () =>
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ref.invalidate(_terminalServersProvider),
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),
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],
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),
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),
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),
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const SizedBox(width: 8),
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// Connect button
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SizedBox(
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height: 36,
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child: FilledButton.icon(
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onPressed: _status == _ConnectionStatus.connecting
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? null
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: _status == _ConnectionStatus.connected
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? () {
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_disconnect();
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_terminal.write(
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'\r\n\x1B[33m[*] 已断开连接\x1B[0m\r\n');
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}
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: _connect,
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icon: Icon(
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_status == _ConnectionStatus.connected
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? Icons.link_off
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: Icons.play_arrow,
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size: 18,
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),
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label: Text(
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_status == _ConnectionStatus.connected
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? '断开'
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: _status == _ConnectionStatus.connecting
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? '连接中...'
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: '连接',
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style: const TextStyle(fontSize: 13),
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),
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),
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),
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],
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),
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),
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// ---- xterm terminal view ----------------------------------------
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Expanded(
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child: Container(
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color: Colors.black,
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child: TerminalView(
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_terminal,
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textStyle: const TerminalStyle(
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fontSize: 14,
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fontFamily: 'monospace',
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),
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padding: const EdgeInsets.all(4),
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),
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),
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),
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],
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),
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);
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}
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}
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