Implement client capabilities endpoint

lib/architex_web/client/controllers/info_controller.ex

@@ -21,4 +21,25 @@ defmodule ArchitexWeb.Client.InfoController do
   def unrecognized(conn, _params) do
     put_error(conn, :unrecognized)
   end
+
+  @doc """
+  Gets information about the server's supported feature set and other relevant capabilities.
+
+  Action for GET /_matrix/client/r0/capabilities.
+  """
+  def capabilities(conn, _params) do
+    data = %{
+      capabilities: %{
+        "m.change_password": %{enabled: false},
+        "m.room_versions": %{
+          default: "5",
+          available: %{"5": "stable"}
+        }
+      }
+    }
+
+    conn
+    |> put_status(200)
+    |> json(data)
+  end
 end

lib/architex_web/router.ex

@@ -53,6 +53,7 @@ defmodule ArchitexWeb.Router do
       post "/logout/all", AccountController, :logout_all
       post "/createRoom", RoomController, :create
       get "/joined_rooms", RoomController, :joined_rooms
+      get "/capabilities", InfoController, :capabilities
 
       scope "/directory" do
         put "/room/:alias", AliasesController, :create