improvement: provide tenant to the magic link sender as an opt

lib/ash_authentication/strategies/magic_link.ex

@@ -33,6 +33,8 @@ defmodule AshAuthentication.Strategy.MagicLink do
           sender fn user_or_email, token, _opts ->
             # will be a user if the token relates to an existing user
             # will be an email if there is no matching user (such as during sign up)
+            # opts will contain the `tenant` key, use this if you need to alter the link based
+            # on the tenant that requested the token
             MyApp.Emails.deliver_magic_link(user_or_email, token)
           end
         end
@@ -45,6 +47,11 @@ defmodule AshAuthentication.Strategy.MagicLink do
   end
   ```
 
+  ## Tenancy
+
+  Note that the tenant is provided to the sender in the `opts` key. Use this if you need
+  to modify the url (i.e `tenant.app.com`) based on the tenant that requested the token.
+
   ## Actions
 
   By default the magic link strategy will automatically generate the request and

lib/ash_authentication/strategies/magic_link/request.ex

@@ -34,7 +34,7 @@ defmodule AshAuthentication.Strategy.MagicLink.Request do
         with true <- strategy.registration_enabled?,
              {sender, send_opts} <- strategy.sender,
              {:ok, token} <- MagicLink.request_token_for_identity(strategy, identity) do
-          sender.send(to_string(identity), token, send_opts)
+          sender.send(to_string(identity), token, Keyword.put(send_opts, :tenant, context.tenant))
         else
           _ ->
             :ok
@@ -43,7 +43,7 @@ defmodule AshAuthentication.Strategy.MagicLink.Request do
       {:ok, user} ->
         with {sender, send_opts} <- strategy.sender,
              {:ok, token} <- MagicLink.request_token_for_identity(strategy, identity) do
-          sender.send(user, token, send_opts)
+          sender.send(user, token, Keyword.put(send_opts, :tenant, context.tenant))
         else
           _ ->
             :ok

lib/ash_authentication/strategies/magic_link/request_preparation.ex

@@ -19,7 +19,7 @@ defmodule AshAuthentication.Strategy.MagicLink.RequestPreparation do
   @doc false
   @impl true
   @spec prepare(Query.t(), keyword, Preparation.Context.t()) :: Query.t()
-  def prepare(query, _opts, _context) do
+  def prepare(query, _opts, context) do
     strategy = Info.strategy_for_action!(query.resource, query.action.name)
 
     identity_field = strategy.identity_field
@@ -36,12 +36,12 @@ defmodule AshAuthentication.Strategy.MagicLink.RequestPreparation do
       |> Ash.Query.ensure_selected(select_for_senders)
       |> Ash.Query.ensure_selected([identity_field])
     end)
-    |> Query.after_action(&after_action(&1, &2, strategy, identity))
+    |> Query.after_action(&after_action(&1, &2, strategy, identity, context))
   end
 
-  defp after_action(_query, [user], %{sender: {sender, send_opts}} = strategy, _identity) do
+  defp after_action(_query, [user], %{sender: {sender, send_opts}} = strategy, _identity, context) do
     case MagicLink.request_token_for(strategy, user) do
-      {:ok, token} -> sender.send(user, token, send_opts)
+      {:ok, token} -> sender.send(user, token, Keyword.put(send_opts, :tenant, context.tenant))
       _ -> nil
     end
 
@@ -52,11 +52,12 @@ defmodule AshAuthentication.Strategy.MagicLink.RequestPreparation do
          _query,
          _,
          %{registration_enabled?: true, sender: {sender, send_opts}} = strategy,
-         identity
+         identity,
+         context
        )
        when not is_nil(identity) do
     case MagicLink.request_token_for_identity(strategy, identity) do
-      {:ok, token} -> sender.send(to_string(identity), token, send_opts)
+      {:ok, token} -> sender.send(to_string(identity), token, Keyword.put(send_opts, :tenant, context.tenant))
       _ -> nil
     end