Add function to query whether server participates in a room

Move from integer timestamps to datetimes

lib/matrix_server.ex

@@ -126,4 +126,12 @@ defmodule MatrixServer do
       ArgumentError -> false
     end
   end
+
+  def min_datetime(datetime1, datetime2) do
+    if DateTime.compare(datetime1, datetime2) == :gt do
+      datetime2
+    else
+      datetime1
+    end
+  end
 end

lib/matrix_server/room_server.ex

@@ -46,6 +46,10 @@ defmodule MatrixServer.RoomServer do
     GenServer.call(pid, {:create_room, account, input})
   end
 
+  def server_in_room(pid, domain) do
+    GenServer.call(pid, {:server_in_room, domain})
+  end
+
   ### Implementation
 
   @impl true
@@ -120,6 +124,18 @@ defmodule MatrixServer.RoomServer do
     end
   end
 
+  def handle_call({:server_in_room, domain}, _from, %{state_set: state_set} = state) do
+    result = Enum.any?(state_set, fn
+      {{"m.room.member", user_id}, %Event{content: %{"membership" => "join"}}} ->
+        MatrixServer.get_domain(user_id) == domain
+
+      _ ->
+        false
+    end)
+
+    {:reply, result, state}
+  end
+
   # TODO: trusted_private_chat:
   # All invitees are given the same power level as the room creator.
   defp room_creation_preset(account, nil, %Room{visibility: visibility} = room, auth_events) do

lib/matrix_server/schema/event.ex

@@ -8,7 +8,7 @@ defmodule MatrixServer.Event do
   @primary_key {:event_id, :string, []}
   schema "events" do
     field :type, :string
-    field :origin_server_ts, :integer
+    field :origin_server_ts, :utc_datetime_usec
     field :state_key, :string
     field :sender, :string
     field :content, :map
@@ -27,7 +27,7 @@ defmodule MatrixServer.Event do
       room_id: room_id,
       sender: MatrixServer.get_mxid(localpart),
       event_id: generate_event_id(),
-      origin_server_ts: System.os_time(:millisecond),
+      origin_server_ts: DateTime.utc_now(),
       prev_events: [],
       auth_events: []
     }

lib/matrix_server/schema/server_key_info.ex

@@ -10,7 +10,7 @@ defmodule MatrixServer.ServerKeyInfo do
 
   @primary_key {:server_name, :string, []}
   schema "server_key_info" do
-    field :valid_until, :integer
+    field :valid_until, :utc_datetime
 
     has_many :signing_keys, SigningKey, foreign_key: :server_name
   end
@@ -34,31 +34,33 @@ defmodule MatrixServer.ServerKeyInfo do
 
   defp refresh_signing_keys(server_name) do
     # TODO: Handle expired keys.
-    in_a_week = System.os_time(:millisecond) + 1000 * 60 * 60 * 24 * 7
+    in_a_week = DateTime.utc_now() |> DateTime.add(60 * 60 * 24 * 7, :second)
     client = HTTPClient.client(server_name)
 
     with {:ok,
           %GetSigningKeys{
             server_name: server_name,
             verify_keys: verify_keys,
-            valid_until_ts: valid_until
-          }} <-
-           HTTPClient.get_signing_keys(client) do
+            valid_until_ts: valid_until_ts
+          }} <- HTTPClient.get_signing_keys(client),
+         {:ok, valid_until} <- DateTime.from_unix(valid_until_ts) do
       signing_keys =
         Enum.map(verify_keys, fn {key_id, %{"key" => key}} ->
           [server_name: server_name, signing_key_id: key_id, signing_key: key]
         end)
 
       # Always check every week to prevent misuse.
-      ski = %ServerKeyInfo{server_name: server_name, valid_until: min(valid_until, in_a_week)}
+      ski = %ServerKeyInfo{
+        server_name: server_name,
+        valid_until: MatrixServer.min_datetime(in_a_week, valid_until)
+      }
 
       case upsert_multi(server_name, ski, signing_keys) |> Repo.transaction() do
         {:ok, %{new_ski: ski}} -> {:ok, ski}
         {:error, _} -> :error
       end
     else
-      :error ->
-        :error
+      _ -> :error
     end
   end
 

lib/matrix_server_web/federation/controllers/key_controller.ex

@@ -5,8 +5,6 @@ defmodule MatrixServerWeb.Federation.KeyController do
 
   alias MatrixServer.KeyServer
 
-  @key_valid_time_ms 1000 * 60 * 24 * 30
-
   def get_signing_keys(conn, _params) do
     keys =
       KeyServer.get_own_signing_keys()
@@ -14,11 +12,15 @@ defmodule MatrixServerWeb.Federation.KeyController do
         {key_id, %{"key" => key}}
       end)
 
+    # TODO: Consider using TimeX.
+    # Valid for one month.
+    valid_until = DateTime.utc_now() |> DateTime.add(60 * 60 * 24 * 30, :second)
+
     data = %{
       server_name: MatrixServer.server_name(),
       verify_keys: keys,
       old_verify_keys: %{},
-      valid_until_ts: System.os_time(:millisecond) + @key_valid_time_ms
+      valid_until_ts: valid_until
     }
 
     case KeyServer.sign_object(data) do

priv/repo/migrations/20210816144214_change_timestamps_to_datetime.exs

@@ -0,0 +1,15 @@
+defmodule MatrixServer.Repo.Migrations.ChangeTimestampsToDatetime do
+  use Ecto.Migration
+
+  def change do
+    alter table(:events) do
+      remove :origin_server_ts, :integer, null: false
+      add :origin_server_ts, :utc_datetime_usec, null: false
+    end
+
+    alter table(:server_key_info) do
+      remove :valid_until, :bigint, default: 0, null: false
+      add :valid_until, :utc_datetime_usec, null: false
+    end
+  end
+end

priv/repo/seeds.exs

@@ -1,5 +1,7 @@
 alias MatrixServer.{Repo, Room, Event, Account, Device}
 
+timestamp = fn n -> DateTime.from_unix!(n, :microsecond) end
+
 Repo.insert!(%Account{
   localpart: "chuck",
   password_hash: Bcrypt.hash_pwd_salt("sneed")
@@ -40,7 +42,7 @@ room =
 
 Repo.insert!(
   Event.create_room(room, alice, "v1")
-  |> Map.put(:origin_server_ts, 0)
+  |> Map.put(:origin_server_ts, timestamp.(0))
   |> Map.put(:event_id, "create")
 )
 
@@ -48,7 +50,7 @@ Repo.insert!(
   Event.join(room, alice)
   |> Map.put(:prev_events, ["create"])
   |> Map.put(:auth_events, ["create"])
-  |> Map.put(:origin_server_ts, 1)
+  |> Map.put(:origin_server_ts, timestamp.(1))
   |> Map.put(:event_id, "join_alice")
 )
 
@@ -56,7 +58,7 @@ Repo.insert!(
   Event.join(room, bob)
   |> Map.put(:prev_events, ["join_alice"])
   |> Map.put(:auth_events, ["create"])
-  |> Map.put(:origin_server_ts, 2)
+  |> Map.put(:origin_server_ts, timestamp.(2))
   |> Map.put(:event_id, "join_bob")
 )
 
@@ -64,7 +66,7 @@ Repo.insert!(
   Event.join(room, charlie)
   |> Map.put(:prev_events, ["join_bob"])
   |> Map.put(:auth_events, ["create"])
-  |> Map.put(:origin_server_ts, 3)
+  |> Map.put(:origin_server_ts, timestamp.(3))
   |> Map.put(:event_id, "join_charlie")
 )
 
@@ -75,7 +77,7 @@ Repo.insert!(
   event
   |> Map.put(:prev_events, ["join_alice"])
   |> Map.put(:auth_events, ["create", "join_alice"])
-  |> Map.put(:origin_server_ts, 4)
+  |> Map.put(:origin_server_ts, timestamp.(4))
   |> Map.put(:event_id, "a")
 )
 
@@ -90,7 +92,7 @@ Repo.insert!(
   event
   |> Map.put(:prev_events, ["a"])
   |> Map.put(:auth_events, ["create", "join_bob", "a"])
-  |> Map.put(:origin_server_ts, 5)
+  |> Map.put(:origin_server_ts, timestamp.(5))
   |> Map.put(:event_id, "b")
 )
 
@@ -98,6 +100,6 @@ Repo.insert!(
   Event.topic(room, alice, "sneed")
   |> Map.put(:prev_events, ["a"])
   |> Map.put(:auth_events, ["create", "join_alice", "a"])
-  |> Map.put(:origin_server_ts, 5)
+  |> Map.put(:origin_server_ts, timestamp.(5))
   |> Map.put(:event_id, "fork")
 )