Clean up code

lib/chronoscope/nts.ex

@@ -27,13 +27,14 @@ defmodule Chronoscope.NTS do
         GenServer.call(pid, :key_establishment)
 
       [] ->
+        {:ok, pid} =
           NTS.DynamicSupervisor
           |> DynamicSupervisor.start_child({
             NTS.Client,
             host: host, port: port, name: {:via, Registry, {NTS.Registry, name}}
           })
 
-        key_establishment(host, port)
+        GenServer.call(pid, :key_establishment)
     end
   end
 end

lib/chronoscope_web/controllers/api/v1/nts/key_establishment_controller.ex

@@ -6,6 +6,7 @@ defmodule ChronoscopeWeb.API.V1.NTS.KeyEstablishmentController do
   alias Chronoscope.NTS
 
   @default_port 4460
+  @max_host_length 255
 
   def get(conn, %{"host" => host, "port" => port}) do
     try do
@@ -24,7 +25,7 @@ defmodule ChronoscopeWeb.API.V1.NTS.KeyEstablishmentController do
   end
 
   defp handle_get(conn, %{host: host, port: port}) when port > 0 and port < 65536 do
-    case nts_behaviour().key_establishment(host, port) do
+    case key_establishment_response(host, port) do
       {:ok, response} ->
         json(conn, %{status: :ok, response: format_response(response)})
 
@@ -37,6 +38,12 @@ defmodule ChronoscopeWeb.API.V1.NTS.KeyEstablishmentController do
     bad_request_response(conn, "port out of range")
   end
 
+  defp key_establishment_response(host, port) do
+    host
+    |> String.slice(0, @max_host_length)
+    |> nts_behaviour().key_establishment(port)
+  end
+
   defp format_response(response) do
     response
     |> Map.take([:aead_algorithms, :cert_expiration, :cookie_length, :cookies, :next_protocols, :port, :server])

test/chronoscope/nts/certificate_test.exs

@@ -1,5 +1,7 @@
 defmodule Chronoscope.NTS.CertificateTest do
-  use ExUnit.Case
+  use Chronoscope.Case
+
+  alias Chronoscope.NTS.DateTimeMock
 
   import Chronoscope.NTS.Certificate
   import Mox
@@ -7,9 +9,6 @@ defmodule Chronoscope.NTS.CertificateTest do
   setup :verify_on_exit!
 
   test "parses the expiration date of a certificate" do
-    Chronoscope.NTS.DateTimeMock
-    |> stub(:utc_now, &DateTime.utc_now/0)
-
     {:ok, expiration, _} =
       :secp256r1
       |> X509.PrivateKey.new_ec()
@@ -22,21 +21,21 @@ defmodule Chronoscope.NTS.CertificateTest do
   end
 
   test "converts certificate datetime to iso8601" do
-    Chronoscope.NTS.DateTimeMock
+    DateTimeMock
     |> expect(:utc_now, fn -> ~U[2024-03-31 01:23:45Z] end)
 
     assert cert_time_to_iso8601("240326110000Z") == "2024-03-26T11:00:00Z"
   end
 
   test "handles century rollover" do
-    Chronoscope.NTS.DateTimeMock
+    DateTimeMock
     |> expect(:utc_now, fn -> ~U[2024-03-31 01:23:45Z] end)
 
     assert cert_time_to_iso8601("010326110000Z") == "2101-03-26T11:00:00Z"
   end
 
   test "handles millenium rollover" do
-    Chronoscope.NTS.DateTimeMock
+    DateTimeMock
     |> expect(:utc_now, fn -> ~U[2999-03-31 01:23:45Z] end)
 
     assert cert_time_to_iso8601("010326110000Z") == "3001-03-26T11:00:00Z"

test/chronoscope_web/controllers/api/v1/nts/key_establishment_controller_test.exs

@@ -5,6 +5,7 @@ defmodule ChronoscopeWeb.API.V1.NTS.KeyEstablishmentControllerTest do
 
   setup :verify_on_exit!
 
+  describe "/api/v1/nts/key-establishment" do
     test "requires a host name", %{conn: conn} do
       response =
         conn
@@ -14,6 +15,26 @@ defmodule ChronoscopeWeb.API.V1.NTS.KeyEstablishmentControllerTest do
       assert %{"error" => "missing host"} == response
     end
 
+    test "truncates the host name", %{conn: conn} do
+      Chronoscope.NTS.BehaviourMock
+      |> expect(
+        :key_establishment,
+        fn "test.example.com.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456",
+           4460 ->
+          {:ok, %{status: :ok}}
+        end
+      )
+
+      response =
+        conn
+        |> get(
+          ~p"/api/v1/nts/key-establishment?host=test.example.com.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789.0123456789"
+        )
+        |> json_response(200)
+
+      assert %{"status" => "ok", "response" => %{"cookies" => 0}} == response
+    end
+
     test "uses the given port number", %{conn: conn} do
       Chronoscope.NTS.BehaviourMock
       |> expect(:key_establishment, fn "localhost", 4461 -> {:ok, %{status: :ok}} end)
@@ -78,4 +99,5 @@ defmodule ChronoscopeWeb.API.V1.NTS.KeyEstablishmentControllerTest do
 
       assert %{"status" => "ok", "response" => %{"cookies" => 3, "cookie_length" => 300}} == response
     end
+  end
 end

test/support/case.ex

@@ -0,0 +1,8 @@
+defmodule Chronoscope.Case do
+  use ExUnit.CaseTemplate
+
+  setup _tags do
+    Mox.stub_with(Chronoscope.NTS.DateTimeMock, Chronoscope.DateTime.Stub)
+    :ok
+  end
+end

test/support/conn_case.ex

@@ -32,6 +32,7 @@ defmodule ChronoscopeWeb.ConnCase do
   end
 
   setup _tags do
+    Mox.stub_with(Chronoscope.NTS.DateTimeMock, Chronoscope.DateTime.Stub)
     {:ok, conn: Phoenix.ConnTest.build_conn()}
   end
 end

test/support/mocks.ex

@@ -1,6 +1,11 @@
-defmodule DateTime.Behaviour do
+defmodule Chronoscope.DateTime.Behaviour do
   @callback utc_now :: DateTime.t()
 end
 
+defmodule Chronoscope.DateTime.Stub do
+  @behaviour Chronoscope.DateTime.Behaviour
+  def utc_now(), do: DateTime.utc_now()
+end
+
 Mox.defmock(Chronoscope.NTS.BehaviourMock, for: Chronoscope.NTS.Behaviour)
-Mox.defmock(Chronoscope.NTS.DateTimeMock, for: DateTime.Behaviour)
+Mox.defmock(Chronoscope.NTS.DateTimeMock, for: Chronoscope.DateTime.Behaviour)