Update

lib/nulla_web/components/templates/page/home.html.heex

@@ -0,0 +1,3 @@
+<main>
+  <.flash_group flash={@flash} />
+</main>

lib/nulla_web/components/templates/page/sign_in.html.heex

@@ -1,4 +1,6 @@
 <main class="flex min-h-screen items-center justify-center">
+  <.flash_group flash={@flash} />
+
   <form class="flex flex-col gap-2" action="/auth/sign_in" method="post">
     <input type="hidden" name="_csrf_token" value={get_csrf_token()} />
     <label for="email">E-mail address *</label>

lib/nulla_web/components/templates/page/sign_up.html.heex

@@ -1,4 +1,6 @@
 <main class="flex min-h-screen items-center justify-center">
+  <.flash_group flash={@flash} />
+
   <form class="flex flex-col gap-2" action="/auth" method="post">
     <input type="hidden" name="_csrf_token" value={get_csrf_token()} />
     <label for="username">Username *</label>

lib/nulla_web/controllers/auth_controller.ex

@@ -11,7 +11,7 @@ defmodule NullaWeb.AuthController do
       if Argon2.verify_pass(password, user.password) do
         conn
         |> put_session(:user_id, user.id)
-        |> redirect(to: "/")
+        |> redirect(to: ~p"/")
       else
         conn
         |> put_flash(:error, "Invalid login or password.")
@@ -28,37 +28,39 @@ defmodule NullaWeb.AuthController do
     conn
     |> configure_session(drop: true)
     |> put_flash(:info, "You have been logged out.")
-    |> redirect(to: "/")
+    |> redirect(to: ~p"/")
   end
 
   def sign_up(conn, %{"username" => username, "email" => email, "password" => password}) do
     instance_settings = InstanceSettings.get_instance_settings!()
 
     if not instance_settings.registration do
-      redirect(conn, to: "/")
-    end
-
-    domain = instance_settings.domain
-    hashed_password = Argon2.hash_pwd_salt(password)
-
-    {publicKeyPem, privateKeyPem} = Nulla.KeyGen.gen()
-
-    with {:ok, actor} <- Actor.create_actor_minimal(username, domain, publicKeyPem),
-         {:ok, user} <-
-           User.create_user(%{
-             id: actor.id,
-             email: email,
-             password: hashed_password,
-             privateKeyPem: privateKeyPem,
-             last_active_at: DateTime.utc_now()
-           }) do
       conn
-      |> put_session(:user_id, user.id)
-      |> put_flash(:info, "You're registred!")
-      |> redirect(to: "/")
+      |> put_flash(:error, "Registration is disabled.")
+      |> redirect(to: ~p"/")
     else
-      {:error, %Ecto.Changeset{} = changeset} ->
-        render(conn, "sign_up.html", changeset: changeset)
+      domain = instance_settings.domain
+      hashed_password = Argon2.hash_pwd_salt(password)
+
+      {publicKeyPem, privateKeyPem} = Nulla.KeyGen.gen()
+
+      with {:ok, actor} <- Actor.create_actor_minimal(username, domain, publicKeyPem),
+           {:ok, user} <-
+             User.create_user(%{
+               id: actor.id,
+               email: email,
+               password: hashed_password,
+               privateKeyPem: privateKeyPem,
+               last_active_at: DateTime.utc_now()
+             }) do
+        conn
+        |> put_session(:user_id, user.id)
+        |> put_flash(:info, "You're registred!")
+        |> redirect(to: ~p"/")
+      else
+        {:error, %Ecto.Changeset{} = changeset} ->
+          render(conn, "sign_up.html", changeset: changeset)
+      end
     end
   end
 end