feat: bind each node to the binary it runs at its first handshake; refuse changes that are not in a CI-signed manifest [CI]

backend/src/MoShiro.Backend.Api/Admin/BuildEndpoints.cs

@@ -25,6 +25,9 @@ public static class BuildEndpoints
         group.MapPost("/nodes/{id}/update", RequestUpdateAsync)
             .Api("nodes_update", "Ask an online agent or probe to install the release it has been offered", Tag).Returns<object>(StatusCodes.Status204NoContent).ProducesProblems(401, 403, 409)
             .Requires(Capability.UpdateConfirm);
+        group.MapDelete("/nodes/{id}/binary", ClearBinaryAsync)
+            .Api("nodes_binary_clear", "Accept the node's current binary: clear its binding so the next handshake binds it again", Tag).Returns<object>(StatusCodes.Status204NoContent).ProducesProblems(401, 403)
+            .Requires(Capability.FleetWrite);
         group.MapGet("/backend/update", BackendUpdateAsync)
             .Api("backend_update_get", "Current channel and host-verified backend update", Tag).Returns<BackendUpdateDto>().ProducesProblems(401, 403)
             .Requires(Capability.UpdateRead);
@@ -70,12 +73,13 @@ public static class BuildEndpoints
         return await PublishReleaseAsync(http, releases, request);
     }
 
-    private static async Task<IResult> GetAsync(HttpContext http, NodeInfoService nodes, ReleaseService releases, BackendUpdates backendUpdates, CancellationToken ct)
+    private static async Task<IResult> GetAsync(HttpContext http, NodeInfoService nodes, ReleaseService releases, BackendUpdates backendUpdates, BinaryBindingService bindings, CancellationToken ct)
     {
+        Dictionary<string, NodeBinding> bound = (await bindings.ListAsync(ct)).ToDictionary(b => b.NodeId, StringComparer.Ordinal);
         var items = (await nodes.ListAsync(ct))
             .OrderBy(n => n.Kind, StringComparer.Ordinal)
             .ThenBy(n => n.NodeId, StringComparer.Ordinal)
-            .Select(n => new NodeBuildDto(n.NodeId, n.Kind, n.Os, n.OsName, n.Arch, n.Version, n.Tag, n.Commit, n.BuiltAt, ToDto(releases.StatusOf(new NodeId(n.NodeId)))))
+            .Select(n => new NodeBuildDto(n.NodeId, n.Kind, n.Os, n.OsName, n.Arch, n.Version, n.Tag, n.Commit, n.BuiltAt, ToDto(releases.StatusOf(new NodeId(n.NodeId))), bound.TryGetValue(n.NodeId, out NodeBinding? binding) ? ToDto(binding) : null))
             .ToList();
         http.Response.Headers.CacheControl = "no-store";
         return TypedResults.Json(new BuildInfoDto(NodeEndpoints.Backend(withCommit: true), items, ToDto(await backendUpdates.GetAsync(ct))), ApiJsonContext.Default.BuildInfoDto);
@@ -133,6 +137,17 @@ public static class BuildEndpoints
         }
     }
 
+    private static NodeBinaryDto ToDto(NodeBinding b) =>
+        new(b.Sha256, b.Signed, b.Seq, DateTimeOffset.FromUnixTimeMilliseconds(b.BoundAtMs), b.Violation, b.ViolationAtMs is { } at ? DateTimeOffset.FromUnixTimeMilliseconds(at) : null);
+
+    /// <summary>管理员确认新的二进制是自己要的：清除绑定，节点下一次握手重新绑定（没有绑定可清也返回 204，幂等）。</summary>
+    private static async Task<IResult> ClearBinaryAsync(HttpContext http, BinaryBindingService bindings, string id)
+    {
+        http.SetDetail("binary binding cleared");
+        await bindings.ClearAsync(id, http.RequestAborted);
+        return TypedResults.NoContent();
+    }
+
     private static NodeUpdateDto? ToDto(UpdateStatus? status) =>
         status is null ? null : new NodeUpdateDto(status.State, status.Current, status.Available?.Tag, status.Available?.Version, status.Error, status.At > 0 ? DateTimeOffset.FromUnixTimeSeconds(status.At) : null);
 }