feat.依旧修更新系统的一天

LanMountainDesktop/Services/Plonds/PlondsHttpClientFactory.cs

@@ -0,0 +1,50 @@
+using System.Net;
+using System.Net.Http.Headers;
+
+namespace LanMountainDesktop.Services.Plonds;
+
+/// <summary>
+/// Shared HTTP client for PLONDS manifest and package downloads.
+/// CDN buckets (e.g. rains3) commonly reject anonymous clients without a User-Agent.
+/// </summary>
+internal static class PlondsHttpClientFactory
+{
+    public static HttpClient Create(TimeSpan? timeout = null)
+    {
+        var handler = new SocketsHttpHandler
+        {
+            AutomaticDecompression = DecompressionMethods.All,
+            AllowAutoRedirect = true,
+            PooledConnectionLifetime = TimeSpan.FromMinutes(5)
+        };
+
+        var client = new HttpClient(handler)
+        {
+            Timeout = timeout ?? TimeSpan.FromMinutes(10)
+        };
+
+        client.DefaultRequestHeaders.UserAgent.Clear();
+        client.DefaultRequestHeaders.UserAgent.Add(
+            new ProductInfoHeaderValue("LanMountainDesktop", GetProductVersion()));
+        client.DefaultRequestHeaders.UserAgent.Add(
+            new ProductInfoHeaderValue("(+https://github.com/wwiinnddyy/LanMountainDesktop)"));
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/octet-stream"));
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("*/*"));
+
+        return client;
+    }
+
+    private static string GetProductVersion()
+    {
+        try
+        {
+            var version = Shared.Contracts.Launcher.AppVersionProvider.ResolveForCurrentProcess().Version;
+            return string.IsNullOrWhiteSpace(version) ? "1.0" : version.Trim();
+        }
+        catch
+        {
+            return "1.0";
+        }
+    }
+}