init

2026-04-23 16:23:40 +08:00
parent 8fcfad5357
commit 9b90a471c2
15 changed files with 898 additions and 0 deletions
@@ -0,0 +1,23 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:vm="using:Avalonia_PC.ViewModels"
+        xmlns:webview="clr-namespace:Avalonia.Controls;assembly=Avalonia.Controls.WebView"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Avalonia_PC.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="Avalonia_PC">
+
+    <Design.DataContext>
+        <!-- This only sets the DataContext for the previewer in an IDE,
+             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <Grid>
+        <webview:NativeWebView x:Name="WebView" />
+    </Grid>
+
+</Window>
@@ -0,0 +1,594 @@
+using Avalonia.Controls;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Reflection;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Avalonia_PC.Views
+{
+    public partial class MainWindow : Window
+    {
+        private const string AppScheme = "app";
+        private const string? OnlineStartupUrl = null;
+        private const string? LocalStartupPath = null;
+        private static readonly JsonSerializerOptions BridgeJsonSerializerOptions = new()
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        };
+
+        private NativeWebView? _webView;
+        private bool _eventsAttached;
+        private object? _webViewAdapter;
+        private HttpListener? _localHttpServer;
+        private CancellationTokenSource? _localHttpServerCts;
+        private string? _localHttpBaseUrl;
+        private string? _localHttpRoot;
+
+        public MainWindow()
+        {
+            InitializeComponent();
+
+            Opened += OnOpened;
+            Closed += OnClosed;
+        }
+
+        private async void OnOpened(object? sender, EventArgs e)
+        {
+            if (_eventsAttached)
+            {
+                return;
+            }
+
+            _webView = this.FindControl<NativeWebView>("WebView");
+            if (_webView is null)
+            {
+                return;
+            }
+
+            _eventsAttached = true;
+            _webView.NavigationCompleted += OnNavigationCompleted;
+            _webView.WebMessageReceived += OnWebMessageReceived;
+            _webView.AdapterCreated += OnAdapterCreated;
+
+            await LoadInitialContentAsync();
+        }
+
+        private void OnAdapterCreated(object? sender, WebViewAdapterEventArgs e)
+        {
+            _webViewAdapter = e.GetType().GetProperty("Adapter")?.GetValue(e);
+        }
+
+        private void OnClosed(object? sender, EventArgs e)
+        {
+            if (_webView is not null)
+            {
+                _webView.NavigationCompleted -= OnNavigationCompleted;
+                _webView.WebMessageReceived -= OnWebMessageReceived;
+                _webView.AdapterCreated -= OnAdapterCreated;
+            }
+
+            _webViewAdapter = null;
+            StopLocalHttpServer();
+        }
+
+        private async void OnNavigationCompleted(object? sender, WebViewNavigationCompletedEventArgs e)
+        {
+            await InjectBridgeScriptAsync();
+        }
+
+        private async void OnWebMessageReceived(object? sender, WebMessageReceivedEventArgs e)
+        {
+            var messageJson = e.Body;
+            if (string.IsNullOrWhiteSpace(messageJson))
+            {
+                return;
+            }
+
+            AppResponse? response = null;
+
+            try
+            {
+                using var document = JsonDocument.Parse(messageJson);
+                var root = document.RootElement;
+
+                if (!root.TryGetProperty("kind", out var kindProperty))
+                {
+                    return;
+                }
+
+                var kind = kindProperty.GetString();
+                if (string.Equals(kind, "app-open-devtools", StringComparison.OrdinalIgnoreCase))
+                {
+                    TryOpenDevTools();
+                    return;
+                }
+
+                if (!string.Equals(kind, "app-request", StringComparison.OrdinalIgnoreCase))
+                {
+                    return;
+                }
+
+                response = await HandleAppRequestAsync(root);
+            }
+            catch (Exception ex)
+            {
+                response = new AppResponse
+                {
+                    Kind = "app-response",
+                    Id = TryGetRequestId(messageJson),
+                    StatusCode = 500,
+                    StatusMessage = "Internal Server Error",
+                    Body = JsonSerializer.Serialize(new { success = false, error = ex.Message }),
+                    Headers = CreateJsonHeaders(),
+                };
+            }
+
+            if (_webView is not null && response is not null)
+            {
+                var responseJson = JsonSerializer.Serialize(response, BridgeJsonSerializerOptions);
+                var responseJsonLiteral = JsonSerializer.Serialize(responseJson);
+                await _webView.InvokeScript($"window.__dispatchAppResponse({responseJsonLiteral})");
+            }
+        }
+
+        private async Task LoadInitialContentAsync()
+        {
+            if (_webView is null)
+            {
+                return;
+            }
+
+            var onlineUrl = GetConfiguredOnlineStartupUrl();
+            if (onlineUrl is not null)
+            {
+                StopLocalHttpServer();
+                _webView.Source = onlineUrl;
+                return;
+            }
+
+            var localHtmlPath = GetConfiguredLocalStartupPath();
+            if (string.IsNullOrWhiteSpace(localHtmlPath) || !File.Exists(localHtmlPath))
+            {
+                return;
+            }
+
+            var localRoot = Path.GetDirectoryName(localHtmlPath);
+            if (string.IsNullOrWhiteSpace(localRoot))
+            {
+                return;
+            }
+
+            await EnsureLocalHttpServerStartedAsync(localRoot);
+            if (string.IsNullOrWhiteSpace(_localHttpBaseUrl))
+            {
+                _webView.Source = new Uri(localHtmlPath);
+                return;
+            }
+
+            _webView.Source = new Uri(new Uri(_localHttpBaseUrl), Path.GetFileName(localHtmlPath));
+        }
+
+        private async Task InjectBridgeScriptAsync()
+        {
+            if (_webView is null)
+            {
+                return;
+            }
+
+            const string script = """
+if (!window.__appBridgeInstalled) {
+    window.__appBridgeInstalled = true;
+    window.isWebView2 = true;
+    const pending = new Map();
+
+    const tryOpenDevTools = () => {
+        window.invokeCSharpAction(JSON.stringify({ kind: 'app-open-devtools' }));
+    };
+
+    window.__dispatchAppResponse = function(jsonStr) {
+        const payload = JSON.parse(jsonStr);
+        const responseId = payload.id ?? payload.Id;
+        const entry = pending.get(responseId);
+        if (!entry) return;
+        pending.delete(responseId);
+        entry.resolve(new Response(payload.body ?? payload.Body ?? '', {
+            status: payload.statusCode ?? payload.StatusCode ?? 200,
+            statusText: payload.statusMessage ?? payload.StatusMessage ?? 'OK',
+            headers: payload.headers ?? payload.Headers ?? { 'Content-Type': 'application/json' }
+        }));
+    };
+
+    const nativeFetch = window.fetch ? window.fetch.bind(window) : null;
+
+    document.addEventListener('keydown', event => {
+        if (event.key === 'F12' || (event.ctrlKey && event.shiftKey && (event.key === 'I' || event.key === 'i'))) {
+            event.preventDefault();
+            tryOpenDevTools();
+        }
+    }, true);
+
+    document.addEventListener('contextmenu', event => {
+        if (event.shiftKey) {
+            event.preventDefault();
+            tryOpenDevTools();
+        }
+    }, true);
+
+    window.fetch = async (input, init) => {
+        const request = input instanceof Request ? input : null;
+        const requestUrl = typeof input === 'string' || input instanceof URL
+            ? input.toString()
+            : request?.url;
+
+        if (!requestUrl || !requestUrl.startsWith('app://')) {
+            if (!nativeFetch) throw new Error('window.fetch is not available.');
+            return nativeFetch(input, init);
+        }
+
+        const combinedHeaders = new Headers(request?.headers);
+        if (init?.headers) {
+            new Headers(init.headers).forEach((value, key) => combinedHeaders.set(key, value));
+        }
+
+        const headers = {};
+        combinedHeaders.forEach((value, key) => headers[key] = value);
+
+        let body = init?.body;
+        if (body === undefined && request) {
+            body = await request.clone().text();
+        }
+
+        if (body && typeof body !== 'string') {
+            body = await new Response(body).text();
+        }
+
+        const id = globalThis.crypto?.randomUUID?.() ?? `${Date.now()}-${Math.random()}`;
+        const responsePromise = new Promise((resolve, reject) => {
+            const timeoutId = setTimeout(() => {
+                pending.delete(id);
+                reject(new Error(`Timed out waiting for ${requestUrl}`));
+            }, 30000);
+
+            pending.set(id, {
+                resolve: response => { clearTimeout(timeoutId); resolve(response); },
+                reject: error => { clearTimeout(timeoutId); reject(error); }
+            });
+        });
+
+        window.invokeCSharpAction(JSON.stringify({
+            kind: 'app-request',
+            id,
+            url: requestUrl,
+            method: init?.method ?? request?.method ?? 'GET',
+            headers,
+            body: body ?? null
+        }));
+
+        return responsePromise;
+    };
+}
+""";
+
+            await _webView.InvokeScript(script);
+        }
+
+        private async Task<AppResponse> HandleAppRequestAsync(JsonElement request)
+        {
+            var id = request.TryGetProperty("id", out var idProperty) ? idProperty.GetString() : null;
+            var url = request.TryGetProperty("url", out var urlProperty) ? urlProperty.GetString() : null;
+            var method = request.TryGetProperty("method", out var methodProperty) ? methodProperty.GetString() : "GET";
+            var body = request.TryGetProperty("body", out var bodyProperty) ? bodyProperty.GetString() : null;
+            var headers = ExtractHeaders(request);
+
+            return await HandleAppRequestAsync(id, url, method, body, headers);
+        }
+
+        private async Task<AppResponse> HandleAppRequestAsync(
+            string? id,
+            string? rawUrl,
+            string? method,
+            string? body,
+            Dictionary<string, string> headers)
+        {
+            var response = new AppResponse
+            {
+                Kind = "app-response",
+                Id = id,
+                StatusCode = 200,
+                StatusMessage = "OK",
+                Headers = CreateJsonHeaders(),
+            };
+
+            try
+            {
+                var uri = new Uri(rawUrl ?? throw new InvalidOperationException("请求地址不能为空。"));
+                var path = uri.AbsolutePath.TrimStart('/');
+                var normalizedPath = path.StartsWith("api/", StringComparison.OrdinalIgnoreCase)
+                    ? path
+                    : $"api/{path}";
+                var authorization = GetAuthorizationHeader(headers);
+                _ = authorization;
+
+                if (string.Equals(method, "OPTIONS", StringComparison.OrdinalIgnoreCase))
+                {
+                    response.StatusCode = 200;
+                    response.StatusMessage = "OK";
+                    response.Body = JsonSerializer.Serialize(new { success = true });
+                    return response;
+                }
+
+                if (string.Equals(normalizedPath, "api/getUser", StringComparison.OrdinalIgnoreCase))
+                {
+                    var user = await GetUserFromDatabaseAsync();
+                    response.Body = JsonSerializer.Serialize(new { success = true, data = user });
+                    return response;
+                }
+
+                if (string.Equals(normalizedPath, "api/processData", StringComparison.OrdinalIgnoreCase))
+                {
+                    var input = string.Empty;
+                    if (!string.IsNullOrWhiteSpace(body))
+                    {
+                        using var jsonDocument = JsonDocument.Parse(body);
+                        if (jsonDocument.RootElement.TryGetProperty("input", out var inputProperty))
+                        {
+                            input = inputProperty.GetString() ?? string.Empty;
+                        }
+                    }
+
+                    var result = await ProcessDataAsync(input);
+                    response.Body = JsonSerializer.Serialize(new { success = true, result });
+                    return response;
+                }
+
+                response.StatusCode = 404;
+                response.StatusMessage = "Not Found";
+                response.Body = JsonSerializer.Serialize(new { success = false, error = "API not found" });
+                return response;
+            }
+            catch (Exception ex)
+            {
+                response.StatusCode = 500;
+                response.StatusMessage = "Internal Server Error";
+                response.Body = JsonSerializer.Serialize(new { success = false, error = ex.Message });
+                return response;
+            }
+        }
+
+        private static Dictionary<string, string> CreateJsonHeaders() => new()
+        {
+            ["Content-Type"] = "application/json; charset=utf-8",
+            ["Access-Control-Allow-Origin"] = "*",
+            ["Access-Control-Allow-Methods"] = "GET, POST, OPTIONS",
+            ["Access-Control-Allow-Headers"] = "Content-Type, Authorization",
+        };
+
+        private static Dictionary<string, string> ExtractHeaders(JsonElement request)
+        {
+            if (!request.TryGetProperty("headers", out var headersElement) ||
+                headersElement.ValueKind != JsonValueKind.Object)
+            {
+                return new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+            }
+
+            var headers = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+            foreach (var property in headersElement.EnumerateObject())
+            {
+                headers[property.Name] = property.Value.GetString() ?? string.Empty;
+            }
+
+            return headers;
+        }
+
+        private static string? GetAuthorizationHeader(Dictionary<string, string> headers)
+        {
+            return headers.FirstOrDefault(
+                entry => string.Equals(entry.Key, "Authorization", StringComparison.OrdinalIgnoreCase)).Value;
+        }
+
+        private static string? TryGetRequestId(string messageJson)
+        {
+            try
+            {
+                using var document = JsonDocument.Parse(messageJson);
+                return document.RootElement.TryGetProperty("id", out var idProperty) ? idProperty.GetString() : null;
+            }
+            catch
+            {
+                return null;
+            }
+        }
+
+        private static Uri? GetConfiguredOnlineStartupUrl()
+        {
+            if (string.IsNullOrWhiteSpace(OnlineStartupUrl))
+            {
+                return null;
+            }
+
+            if (!Uri.TryCreate(OnlineStartupUrl, UriKind.Absolute, out var uri))
+            {
+                return null;
+            }
+
+            return uri.Scheme is "http" or "https" ? uri : null;
+        }
+
+        private static string? GetConfiguredLocalStartupPath()
+        {
+            if (!string.IsNullOrWhiteSpace(LocalStartupPath))
+            {
+                return Path.GetFullPath(LocalStartupPath);
+            }
+
+            return Path.Combine(AppContext.BaseDirectory, "www", "index.html");
+        }
+
+        private async Task EnsureLocalHttpServerStartedAsync(string localRoot)
+        {
+            if (!string.IsNullOrWhiteSpace(_localHttpBaseUrl) &&
+                _localHttpServer is not null &&
+                string.Equals(_localHttpRoot, localRoot, StringComparison.OrdinalIgnoreCase))
+            {
+                return;
+            }
+
+            StopLocalHttpServer();
+
+            var port = GetAvailableTcpPort();
+            var prefix = $"http://127.0.0.1:{port}/";
+
+            _localHttpServerCts = new CancellationTokenSource();
+            _localHttpServer = new HttpListener();
+            _localHttpServer.Prefixes.Add(prefix);
+            _localHttpServer.Start();
+            _localHttpBaseUrl = prefix;
+            _localHttpRoot = localRoot;
+
+            _ = Task.Run(() => RunLocalHttpServerLoopAsync(_localHttpServer, _localHttpServerCts.Token, localRoot));
+        }
+
+        private static async Task RunLocalHttpServerLoopAsync(HttpListener listener, CancellationToken cancellationToken, string wwwRoot)
+        {
+            try
+            {
+                while (!cancellationToken.IsCancellationRequested)
+                {
+                    var context = await listener.GetContextAsync();
+                    _ = Task.Run(() => HandleLocalHttpRequest(context, wwwRoot), cancellationToken);
+                }
+            }
+            catch
+            {
+            }
+        }
+
+        private static async Task HandleLocalHttpRequest(HttpListenerContext context, string wwwRoot)
+        {
+            try
+            {
+                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
+                {
+                }
+            }
+        }
+
+        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",
+            };
+        }
+
+        private static int GetAvailableTcpPort()
+        {
+            var listener = new TcpListener(IPAddress.Loopback, 0);
+            listener.Start();
+            var port = ((IPEndPoint)listener.LocalEndpoint).Port;
+            listener.Stop();
+            return port;
+        }
+
+        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);
+        }
+
+        private void StopLocalHttpServer()
+        {
+            try
+            {
+                _localHttpServerCts?.Cancel();
+                _localHttpServer?.Stop();
+                _localHttpServer?.Close();
+            }
+            catch
+            {
+            }
+            finally
+            {
+                _localHttpServerCts?.Dispose();
+                _localHttpServerCts = null;
+                _localHttpServer = null;
+                _localHttpBaseUrl = null;
+                _localHttpRoot = null;
+            }
+        }
+
+        private static async Task<object> GetUserFromDatabaseAsync()
+        {
+            await Task.Delay(100);
+            return new { id = 1, name = "张三", email = "zhangsan@example.com" };
+        }
+
+        private static async Task<string> ProcessDataAsync(string? input)
+        {
+            await Task.Delay(200);
+            return $"Processed: {input?.ToUpperInvariant()}";
+        }
+
+        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();
+        }
+    }
+}