Implement client get/set avatar URL endpoint

lib/architex_web/client/controllers/account_controller.ex

@@ -1,7 +1,6 @@
 defmodule ArchitexWeb.Client.AccountController do
   use ArchitexWeb, :controller
 
-  import Architex
   import ArchitexWeb.Error
 
   alias Architex.{Account, Repo}
@@ -32,7 +31,7 @@ defmodule ArchitexWeb.Client.AccountController do
   Action for GET /_matrix/client/r0/account/whoami.
   """
   def whoami(%Conn{assigns: %{account: %Account{localpart: localpart}}} = conn, _params) do
-    data = %{user_id: get_mxid(localpart)}
+    data = %{user_id: Architex.get_mxid(localpart)}
 
     conn
     |> put_status(200)

lib/architex_web/client/controllers/profile_controller.ex

@@ -0,0 +1,64 @@
+defmodule ArchitexWeb.Client.ProfileController do
+  use ArchitexWeb, :controller
+
+  import ArchitexWeb.Error
+  import Ecto.Query
+
+  alias Architex.{Repo, Account}
+  alias Architex.Types.UserId
+  alias Plug.Conn
+  alias Ecto.Changeset
+
+  @doc """
+  Get the user's avatar URL.
+
+  Action for GET /_matrix/client/r0/profile/{userId}/avatar_url.
+  """
+  def get_avatar_url(conn, %{"user_id" => user_id}) do
+    case UserId.cast(user_id) do
+      {:ok, %UserId{localpart: localpart, domain: domain}} ->
+        if domain == Architex.server_name() do
+          case Repo.one(from a in Account, where: a.localpart == ^localpart) do
+            %Account{avatar_url: avatar_url} ->
+              data = if avatar_url, do: %{avatar_url: avatar_url}, else: %{}
+
+              conn
+              |> put_status(200)
+              |> json(data)
+
+            nil ->
+              put_error(conn, :not_found, "User was not found.")
+          end
+        else
+          # TODO: Use federation to lookup avatar URL.
+          put_error(conn, :not_found, "User was not found.")
+        end
+
+      :error ->
+        put_error(conn, :not_found, "User ID is invalid.")
+    end
+  end
+
+  @doc """
+  This API sets the given user's avatar URL.
+
+  Action for PUT /_matrix/client/r0/profile/{userId}/avatar_url.
+  """
+  def set_avatar_url(%Conn{assigns: %{account: account}} = conn, %{"user_id" => user_id} = params) do
+    if Account.get_mxid(account) == user_id do
+      avatar_url = Map.get(params, "avatar_url")
+
+      if not is_nil(avatar_url) do
+        account
+        |> Changeset.change(avatar_url: avatar_url)
+        |> Repo.update()
+      end
+
+      conn
+      |> send_resp(200, [])
+      |> halt()
+    else
+      put_error(conn, :unauthorized, "User ID does not match access token.")
+    end
+  end
+end