luoqiang
7a5273dc56
新增项目基础结构与配置，集成 Vue3、Vite、TypeScript、ESLint 等开发环境。实现主页面、样式、图标组件，封装 http 请求，支持 WebView2 与普通浏览器统一 API 调用，便于与 C# 后端通信。完善类型声明与开发文档。
705 lines
24 KiB
C#
705 lines
24 KiB
C#
using Avalonia.Controls;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.Reflection;
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using System.Text.Json;
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using System.Threading;
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using System.Threading.Tasks;
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namespace Avalonia_PC.Views
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{
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public partial class MainWindow : Window
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{
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private const string AppScheme = "app";
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private const string? OnlineStartupUrl = "http://localhost:51240";
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//private const string? OnlineStartupUrl = null;
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private const string? LocalStartupPath = null;
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private static readonly JsonSerializerOptions BridgeJsonSerializerOptions = new()
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{
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
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};
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private NativeWebView? _webView;
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private bool _eventsAttached;
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private object? _webViewAdapter;
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private HttpListener? _localHttpServer;
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private CancellationTokenSource? _localHttpServerCts;
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private string? _localHttpBaseUrl;
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private string? _localHttpRoot;
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#region 生命周期与 WebView 事件
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/// <summary>
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/// 初始化窗口并注册生命周期事件。
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/// </summary>
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public MainWindow(IServiceProvider services)
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{
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_services = services;
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InitializeComponent();
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Opened += OnOpened;
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Closed += OnClosed;
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RegisterRoutes();
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}
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/// <summary>
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/// 窗口打开后初始化 WebView、挂载事件并加载入口页面。
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/// </summary>
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private async void OnOpened(object? sender, EventArgs e)
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{
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if (_eventsAttached)
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{
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return;
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}
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_webView = this.FindControl<NativeWebView>("WebView");
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if (_webView is null)
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{
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return;
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}
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_eventsAttached = true;
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_webView.NavigationCompleted += OnNavigationCompleted;
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_webView.WebMessageReceived += OnWebMessageReceived;
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_webView.AdapterCreated += OnAdapterCreated;
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await LoadInitialContentAsync();
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}
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/// <summary>
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/// WebView 适配器创建后缓存实例，用于后续打开开发者工具。
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/// </summary>
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private void OnAdapterCreated(object? sender, WebViewAdapterEventArgs e)
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{
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_webViewAdapter = e.GetType().GetProperty("Adapter")?.GetValue(e);
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}
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/// <summary>
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/// 窗口关闭时解绑事件并释放本地资源。
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/// </summary>
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private void OnClosed(object? sender, EventArgs e)
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{
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if (_webView is not null)
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{
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_webView.NavigationCompleted -= OnNavigationCompleted;
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_webView.WebMessageReceived -= OnWebMessageReceived;
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_webView.AdapterCreated -= OnAdapterCreated;
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}
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_webViewAdapter = null;
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StopLocalHttpServer();
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}
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/// <summary>
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/// 页面导航完成后注入 JS 桥接脚本。
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/// </summary>
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private async void OnNavigationCompleted(object? sender, WebViewNavigationCompletedEventArgs e)
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{
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await InjectBridgeScriptAsync();
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}
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#endregion
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#region 前端桥接与页面加载
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/// <summary>
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/// 接收前端消息并进行分发（打开调试工具 / 处理 app 请求）。
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/// </summary>
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private async void OnWebMessageReceived(object? sender, WebMessageReceivedEventArgs e)
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{
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var messageJson = e.Body;
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if (string.IsNullOrWhiteSpace(messageJson))
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{
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return;
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}
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AppResponse? response = null;
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try
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{
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using var document = JsonDocument.Parse(messageJson);
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var root = document.RootElement;
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if (!root.TryGetProperty("kind", out var kindProperty))
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{
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return;
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}
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var kind = kindProperty.GetString();
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if (string.Equals(kind, "app-open-devtools", StringComparison.OrdinalIgnoreCase))
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{
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TryOpenDevTools();
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return;
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}
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if (!string.Equals(kind, "app-request", StringComparison.OrdinalIgnoreCase))
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{
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return;
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}
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response = await HandleAppRequestAsync(root);
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}
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catch (Exception ex)
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{
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response = new AppResponse
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{
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Kind = "app-response",
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Id = TryGetRequestId(messageJson),
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StatusCode = 500,
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StatusMessage = "Internal Server Error",
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Body = JsonSerializer.Serialize(new { success = false, error = ex.Message }),
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Headers = CreateJsonHeaders(),
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};
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}
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if (_webView is not null && response is not null)
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{
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var responseJson = JsonSerializer.Serialize(response, BridgeJsonSerializerOptions);
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var responseJsonLiteral = JsonSerializer.Serialize(responseJson);
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await _webView.InvokeScript($"window.__dispatchAppResponse({responseJsonLiteral})");
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}
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}
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/// <summary>
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/// 加载初始页面：优先在线地址，其次本地路径（通过本地 HTTP 服务托管）。
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/// </summary>
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private async Task LoadInitialContentAsync()
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{
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if (_webView is null)
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{
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return;
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}
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var onlineUrl = GetConfiguredOnlineStartupUrl();
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if (onlineUrl is not null)
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{
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StopLocalHttpServer();
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_webView.Source = onlineUrl;
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return;
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}
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var localHtmlPath = GetConfiguredLocalStartupPath();
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if (string.IsNullOrWhiteSpace(localHtmlPath) || !File.Exists(localHtmlPath))
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{
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return;
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}
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var localRoot = Path.GetDirectoryName(localHtmlPath);
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if (string.IsNullOrWhiteSpace(localRoot))
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{
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return;
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}
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await EnsureLocalHttpServerStartedAsync(localRoot);
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if (string.IsNullOrWhiteSpace(_localHttpBaseUrl))
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{
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_webView.Source = new Uri(localHtmlPath);
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return;
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}
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_webView.Source = new Uri(new Uri(_localHttpBaseUrl), Path.GetFileName(localHtmlPath));
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}
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/// <summary>
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/// 向页面注入桥接脚本，接管 app:// 请求并回传到 C# 处理。
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/// </summary>
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private async Task InjectBridgeScriptAsync()
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{
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if (_webView is null)
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{
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return;
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}
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await _webView.InvokeScript(BridgeScript);
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}
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#endregion
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#region 请求分发与通用响应
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/// <summary>
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/// 解析前端请求消息并转发到统一请求处理入口。
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/// </summary>
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private async Task<AppResponse> HandleAppRequestAsync(JsonElement request)
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{
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var id = request.TryGetProperty("id", out var idProperty) ? idProperty.GetString() : null;
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var url = request.TryGetProperty("url", out var urlProperty) ? urlProperty.GetString() : null;
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var method = request.TryGetProperty("method", out var methodProperty) ? methodProperty.GetString() : "GET";
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var body = request.TryGetProperty("body", out var bodyProperty) ? bodyProperty.GetString() : null;
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var headers = ExtractHeaders(request);
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return await HandleAppRequestAsync(id, url, method, body, headers);
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}
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/// <summary>
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/// 统一请求处理：构建上下文、处理 OPTIONS、按前缀分发并封装标准响应。
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/// </summary>
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private async Task<AppResponse> HandleAppRequestAsync(
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string? id,
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string? rawUrl,
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string? method,
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string? body,
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Dictionary<string, string> headers)
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{
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var response = new AppResponse
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{
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Kind = "app-response",
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Id = id,
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StatusCode = 200,
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StatusMessage = "OK",
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Headers = CreateJsonHeaders(),
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};
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try
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{
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var uri = new Uri(rawUrl ?? throw new InvalidOperationException("请求地址不能为空。"));
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var requestContext = CreateRouteRequestContext(uri, body);
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if (string.Equals(method, "OPTIONS", StringComparison.OrdinalIgnoreCase))
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{
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response.StatusCode = 200;
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response.StatusMessage = "OK";
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response.Body = JsonSerializer.Serialize(new { success = true });
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return response;
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}
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var routeResult = await DispatchByPrefixAsync(requestContext);
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if (routeResult.IsMatched)
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{
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response.StatusCode = routeResult.StatusCode;
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response.StatusMessage = routeResult.StatusMessage;
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response.Body = BuildSuccessResponseBody(routeResult.Data);
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return response;
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}
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response.StatusCode = 404;
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response.StatusMessage = "Not Found";
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response.Body = JsonSerializer.Serialize(new { success = false, error = "API not found" });
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return response;
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}
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catch (Exception ex)
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{
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response.StatusCode = 500;
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response.StatusMessage = "Internal Server Error";
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response.Body = JsonSerializer.Serialize(new { success = false, error = ex.Message });
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return response;
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}
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}
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/// <summary>
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/// 按路由表匹配并调用对应处理器。
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/// </summary>
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private async Task<RouteDispatchResult> DispatchByPrefixAsync(RouteRequestContext requestContext)
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{
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if (_routes.TryGetValue(requestContext.NormalizedPath, out var handler))
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{
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var data = await handler(requestContext);
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return RouteDispatchResult.Success(data);
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}
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return RouteDispatchResult.NotMatched();
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}
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/// <summary>
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/// 统一构建成功响应体，保持前后端响应结构一致。
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/// </summary>
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private static string BuildSuccessResponseBody(object? data)
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{
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return JsonSerializer.Serialize(new { success = true, data });
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}
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/// <summary>
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/// 从 URI 解析路径段、查询参数和 body，构建路由上下文。
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/// </summary>
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private static RouteRequestContext CreateRouteRequestContext(Uri uri, string? body)
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{
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var host = uri.Host ?? string.Empty;
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var absolutePath = uri.AbsolutePath ?? string.Empty;
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var combinedPath = $"{host}/{absolutePath}";
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var pathSegments = combinedPath
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.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
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.Select(Uri.UnescapeDataString)
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.ToArray();
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var normalizedPath = string.Join('/', pathSegments);
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var query = ParseQueryParameters(uri.Query);
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return new RouteRequestContext
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{
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NormalizedPath = normalizedPath,
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PathSegments = pathSegments,
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Query = query,
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Body = body,
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};
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}
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/// <summary>
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/// 解析查询字符串为忽略大小写的字典。
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/// </summary>
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private static Dictionary<string, string> ParseQueryParameters(string? queryString)
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{
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var query = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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if (string.IsNullOrWhiteSpace(queryString))
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{
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return query;
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}
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var raw = queryString.TrimStart('?');
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foreach (var pair in raw.Split('&', StringSplitOptions.RemoveEmptyEntries))
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{
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var separatorIndex = pair.IndexOf('=');
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if (separatorIndex < 0)
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{
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query[Uri.UnescapeDataString(pair)] = string.Empty;
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continue;
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}
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var key = Uri.UnescapeDataString(pair[..separatorIndex]);
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var value = Uri.UnescapeDataString(pair[(separatorIndex + 1)..]);
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query[key] = value;
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}
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return query;
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}
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/// <summary>
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/// 按 body -> query -> path 的优先级提取业务输入参数。
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/// </summary>
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private static string ExtractInput(RouteRequestContext requestContext)
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{
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if (!string.IsNullOrWhiteSpace(requestContext.Body))
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{
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using var jsonDocument = JsonDocument.Parse(requestContext.Body);
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if (jsonDocument.RootElement.TryGetProperty("input", out var inputProperty))
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{
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return inputProperty.GetString() ?? string.Empty;
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}
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}
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if (requestContext.Query.TryGetValue("input", out var inputFromQuery) &&
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!string.IsNullOrWhiteSpace(inputFromQuery))
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{
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return inputFromQuery;
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}
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if (requestContext.PathSegments.Length > 2)
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{
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return string.Join('/', requestContext.PathSegments.Skip(2));
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}
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return string.Empty;
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}
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/// <summary>
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/// 创建桥接响应的默认 JSON/CORS 头。
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/// </summary>
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private static Dictionary<string, string> CreateJsonHeaders() => new()
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{
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["Content-Type"] = "application/json; charset=utf-8",
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["Access-Control-Allow-Origin"] = "*",
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["Access-Control-Allow-Methods"] = "GET, POST, OPTIONS",
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["Access-Control-Allow-Headers"] = "Content-Type, Authorization",
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};
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/// <summary>
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/// 从前端请求消息中提取请求头。
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/// </summary>
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private static Dictionary<string, string> ExtractHeaders(JsonElement request)
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{
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if (!request.TryGetProperty("headers", out var headersElement) ||
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headersElement.ValueKind != JsonValueKind.Object)
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{
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return new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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}
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var headers = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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foreach (var property in headersElement.EnumerateObject())
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{
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headers[property.Name] = property.Value.GetString() ?? string.Empty;
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}
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return headers;
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}
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/// <summary>
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/// 获取授权头，供鉴权逻辑扩展使用。
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/// </summary>
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private static string? GetAuthorizationHeader(Dictionary<string, string> headers)
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{
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return headers.FirstOrDefault(
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entry => string.Equals(entry.Key, "Authorization", StringComparison.OrdinalIgnoreCase)).Value;
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}
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/// <summary>
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/// 在异常情况下尝试提取请求 id，确保前端可收到对应错误响应。
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/// </summary>
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private static string? TryGetRequestId(string messageJson)
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{
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try
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{
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using var document = JsonDocument.Parse(messageJson);
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return document.RootElement.TryGetProperty("id", out var idProperty) ? idProperty.GetString() : null;
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}
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catch
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{
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return null;
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}
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}
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#endregion
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#region 页面地址配置与本地静态服务
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/// <summary>
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/// 获取在线启动地址配置（仅允许 http/https）。
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/// </summary>
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private static Uri? GetConfiguredOnlineStartupUrl()
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{
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if (string.IsNullOrWhiteSpace(OnlineStartupUrl))
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{
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return null;
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}
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if (!Uri.TryCreate(OnlineStartupUrl, UriKind.Absolute, out var uri))
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{
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return null;
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}
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return uri.Scheme is "http" or "https" ? uri : null;
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}
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/// <summary>
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/// 获取本地启动文件路径，未配置时默认使用输出目录 www/index.html。
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/// </summary>
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private static string? GetConfiguredLocalStartupPath()
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{
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if (!string.IsNullOrWhiteSpace(LocalStartupPath))
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{
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return Path.GetFullPath(LocalStartupPath);
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}
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return Path.Combine(AppContext.BaseDirectory, "www", "index.html");
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}
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/// <summary>
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/// 确保本地 HTTP 静态服务已启动；根目录变化时会重启。
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/// </summary>
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private async Task EnsureLocalHttpServerStartedAsync(string localRoot)
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{
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if (!string.IsNullOrWhiteSpace(_localHttpBaseUrl) &&
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_localHttpServer is not null &&
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string.Equals(_localHttpRoot, localRoot, StringComparison.OrdinalIgnoreCase))
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{
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return;
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}
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StopLocalHttpServer();
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var port = GetAvailableTcpPort();
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var prefix = $"http://127.0.0.1:{port}/";
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_localHttpServerCts = new CancellationTokenSource();
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_localHttpServer = new HttpListener();
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_localHttpServer.Prefixes.Add(prefix);
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_localHttpServer.Start();
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_localHttpBaseUrl = prefix;
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_localHttpRoot = localRoot;
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_ = Task.Run(() => RunLocalHttpServerLoopAsync(_localHttpServer, _localHttpServerCts.Token, localRoot));
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}
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/// <summary>
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/// 本地静态服务主循环，持续接收并分发请求。
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/// </summary>
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private static async Task RunLocalHttpServerLoopAsync(HttpListener listener, CancellationToken cancellationToken, string wwwRoot)
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{
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try
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{
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while (!cancellationToken.IsCancellationRequested)
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{
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var context = await listener.GetContextAsync();
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_ = Task.Run(() => HandleLocalHttpRequest(context, wwwRoot), cancellationToken);
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}
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}
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catch
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{
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}
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}
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/// <summary>
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/// 处理本地静态资源请求并返回文件内容。
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/// </summary>
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private static async Task HandleLocalHttpRequest(HttpListenerContext context, string wwwRoot)
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{
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try
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{
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var relativePath = context.Request.Url?.AbsolutePath.TrimStart('/') ?? string.Empty;
|
||
if (string.IsNullOrWhiteSpace(relativePath))
|
||
{
|
||
relativePath = "index.html";
|
||
}
|
||
|
||
relativePath = relativePath.Replace('/', Path.DirectorySeparatorChar);
|
||
var fullPath = Path.GetFullPath(Path.Combine(wwwRoot, relativePath));
|
||
var fullRoot = Path.GetFullPath(wwwRoot);
|
||
|
||
if (!fullPath.StartsWith(fullRoot, StringComparison.OrdinalIgnoreCase) || !File.Exists(fullPath))
|
||
{
|
||
context.Response.StatusCode = 404;
|
||
context.Response.Close();
|
||
return;
|
||
}
|
||
|
||
context.Response.ContentType = GetContentType(fullPath);
|
||
await using var input = File.OpenRead(fullPath);
|
||
context.Response.ContentLength64 = input.Length;
|
||
await input.CopyToAsync(context.Response.OutputStream);
|
||
context.Response.OutputStream.Close();
|
||
}
|
||
catch
|
||
{
|
||
try
|
||
{
|
||
context.Response.StatusCode = 500;
|
||
context.Response.Close();
|
||
}
|
||
catch
|
||
{
|
||
}
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// 根据后缀返回静态资源 Content-Type。
|
||
/// </summary>
|
||
private static string GetContentType(string filePath)
|
||
{
|
||
return Path.GetExtension(filePath).ToLowerInvariant() switch
|
||
{
|
||
".html" => "text/html; charset=utf-8",
|
||
".js" => "application/javascript; charset=utf-8",
|
||
".css" => "text/css; charset=utf-8",
|
||
".json" => "application/json; charset=utf-8",
|
||
_ => "application/octet-stream",
|
||
};
|
||
}
|
||
|
||
/// <summary>
|
||
/// 获取一个可用本地端口，用于启动本地静态服务。
|
||
/// </summary>
|
||
private static int GetAvailableTcpPort()
|
||
{
|
||
var listener = new TcpListener(IPAddress.Loopback, 0);
|
||
listener.Start();
|
||
var port = ((IPEndPoint)listener.LocalEndpoint).Port;
|
||
listener.Stop();
|
||
return port;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 尝试打开 WebView 开发者工具（兼容不同适配器方法名）。
|
||
/// </summary>
|
||
private void TryOpenDevTools()
|
||
{
|
||
if (_webViewAdapter is null)
|
||
{
|
||
return;
|
||
}
|
||
|
||
var adapterType = _webViewAdapter.GetType();
|
||
var method = adapterType.GetMethod("OpenDevTools", BindingFlags.Public | BindingFlags.Instance) ??
|
||
adapterType.GetMethod("ShowDevTools", BindingFlags.Public | BindingFlags.Instance);
|
||
method?.Invoke(_webViewAdapter, null);
|
||
}
|
||
|
||
/// <summary>
|
||
/// 停止并释放本地静态服务资源。
|
||
/// </summary>
|
||
private void StopLocalHttpServer()
|
||
{
|
||
try
|
||
{
|
||
_localHttpServerCts?.Cancel();
|
||
_localHttpServer?.Stop();
|
||
_localHttpServer?.Close();
|
||
}
|
||
catch
|
||
{
|
||
}
|
||
finally
|
||
{
|
||
_localHttpServerCts?.Dispose();
|
||
_localHttpServerCts = null;
|
||
_localHttpServer = null;
|
||
_localHttpBaseUrl = null;
|
||
_localHttpRoot = null;
|
||
}
|
||
}
|
||
|
||
#endregion
|
||
|
||
#region DTO / 路由上下文模型
|
||
|
||
private sealed class AppResponse
|
||
{
|
||
public string Kind { get; set; } = string.Empty;
|
||
|
||
public string? Id { get; set; }
|
||
|
||
public int StatusCode { get; set; }
|
||
|
||
public string StatusMessage { get; set; } = string.Empty;
|
||
|
||
public string Body { get; set; } = string.Empty;
|
||
|
||
public Dictionary<string, string> Headers { get; set; } = new();
|
||
}
|
||
|
||
private sealed class RouteRequestContext
|
||
{
|
||
public string NormalizedPath { get; init; } = string.Empty;
|
||
|
||
public string[] PathSegments { get; init; } = [];
|
||
|
||
public Dictionary<string, string> Query { get; init; } = new(StringComparer.OrdinalIgnoreCase);
|
||
|
||
public string? Body { get; init; }
|
||
}
|
||
|
||
private sealed class RouteDispatchResult
|
||
{
|
||
public bool IsMatched { get; init; }
|
||
|
||
public int StatusCode { get; init; } = 200;
|
||
|
||
public string StatusMessage { get; init; } = "OK";
|
||
|
||
public object? Data { get; init; }
|
||
|
||
public static RouteDispatchResult Success(object? data)
|
||
{
|
||
return new RouteDispatchResult
|
||
{
|
||
IsMatched = true,
|
||
Data = data,
|
||
};
|
||
}
|
||
|
||
public static RouteDispatchResult NotMatched()
|
||
{
|
||
return new RouteDispatchResult
|
||
{
|
||
IsMatched = false,
|
||
};
|
||
}
|
||
}
|
||
|
||
#endregion
|
||
}
|
||
}
|