Implement client send message endpoint

Fix state res and authorization to handle missing state_keys

lib/matrix_server/schema/device.ex

@@ -3,7 +3,7 @@ defmodule MatrixServer.Device do
 
   import Ecto.{Changeset, Query}
 
-  alias MatrixServer.{Account, Device, Repo}
+  alias MatrixServer.{Account, Device, Repo, DeviceTransaction}
   alias MatrixServerWeb.Client.Request.Login
 
   @type t :: %__MODULE__{
@@ -19,6 +19,7 @@ defmodule MatrixServer.Device do
     field :display_name, :string
 
     belongs_to :account, Account
+    has_many :device_transactions, DeviceTransaction
   end
 
   def changeset(device, params \\ %{}) do

lib/matrix_server/schema/device_transaction.ex

@@ -0,0 +1,18 @@
+defmodule MatrixServer.DeviceTransaction do
+  use Ecto.Schema
+
+  alias MatrixServer.Device
+
+  @type t :: %__MODULE__{
+          txn_id: String.t(),
+          event_id: String.t(),
+          device_id: integer()
+        }
+
+  @primary_key {:txn_id, :string, []}
+  schema "device_transactions" do
+    field :event_id, :string
+
+    belongs_to :device, Device
+  end
+end

lib/matrix_server/schema/event.ex

@@ -10,7 +10,7 @@ defmodule MatrixServer.Event do
   @type t :: %__MODULE__{
           type: String.t(),
           origin_server_ts: integer(),
-          state_key: String.t(),
+          state_key: String.t() | nil,
           sender: UserId.t(),
           content: map(),
           prev_events: [String.t()] | nil,
@@ -73,6 +73,15 @@ defmodule MatrixServer.Event do
     }
   end
 
+  @spec custom_message(Room.t(), Account.t(), String.t(), map()) :: t()
+  def custom_message(room, sender, type, content) do
+    %Event{
+      Event.new(room, sender)
+      | type: type,
+        content: content
+    }
+  end
+
   @spec is_control_event(t()) :: boolean()
   def is_control_event(%Event{type: "m.room.power_levels", state_key: ""}), do: true
   def is_control_event(%Event{type: "m.room.join_rules", state_key: ""}), do: true
@@ -131,7 +140,7 @@ defmodule MatrixServer.Event do
       length(prev_events) == length(prev_event_ids) and
       not MatrixServer.has_duplicates?(state_pairs) and
       valid_auth_events?(event, auth_events) and
-      Enum.find_value(state_pairs, &(&1 == {"m.room.create", ""})) and
+      Enum.find_value(state_pairs, false, &(&1 == {"m.room.create", ""})) and
       do_prevalidate(event, auth_events, prev_events)
   end