fix registration email

lib/cannery/accounts.ex

@@ -4,10 +4,10 @@ defmodule Cannery.Accounts do
   """
 
   import Ecto.Query, warn: false
-  alias Cannery.Repo
+  alias Cannery.{Mailer, Repo}
   alias Cannery.Accounts.{User, UserToken}
-  alias Cannery.Mailer
   alias Ecto.{Changeset, Multi}
+  alias Oban.Job
 
   ## Database getters
 
@@ -202,8 +202,7 @@ defmodule Cannery.Accounts do
       {:ok, %{to: ..., body: ...}}
 
   """
-  @spec deliver_update_email_instructions(User.t(), String.t(), function) ::
-          {:ok, any()} | {:error, atom()}
+  @spec deliver_update_email_instructions(User.t(), String.t(), function) :: Job.t()
   def deliver_update_email_instructions(user, current_email, update_email_url_fun)
       when is_function(update_email_url_fun, 1) do
     {encoded_token, user_token} = UserToken.build_email_token(user, "change:#{current_email}")
@@ -319,8 +318,7 @@ defmodule Cannery.Accounts do
       {:error, :already_confirmed}
 
   """
-  @spec deliver_user_confirmation_instructions(User.t(), function) ::
-          {:ok, any()} | {:error, atom()}
+  @spec deliver_user_confirmation_instructions(User.t(), function) :: Job.t()
   def deliver_user_confirmation_instructions(user, confirmation_url_fun)
       when is_function(confirmation_url_fun, 1) do
     if user.confirmed_at do
@@ -367,8 +365,7 @@ defmodule Cannery.Accounts do
       {:ok, %{to: ..., body: ...}}
 
   """
-  @spec deliver_user_reset_password_instructions(User.t(), function()) ::
-          {:ok, any()} | {:error, atom()}
+  @spec deliver_user_reset_password_instructions(User.t(), function()) :: Job.t()
   def deliver_user_reset_password_instructions(user, reset_password_url_fun)
       when is_function(reset_password_url_fun, 1) do
     {encoded_token, user_token} = UserToken.build_email_token(user, "reset_password")

lib/cannery/accounts/email.ex

@@ -7,7 +7,7 @@ defmodule Cannery.Email do
   `lib/cannery_web/templates/layout/email.txt.heex` for text emails.
   """
 
-  use Phoenix.Swoosh, view: Cannery.EmailView, layout: {Cannery.LayoutView, :email}
+  use Phoenix.Swoosh, view: CanneryWeb.EmailView, layout: {CanneryWeb.LayoutView, :email}
   import CanneryWeb.Gettext
   alias Cannery.Accounts.User
   alias CanneryWeb.EmailView
@@ -19,33 +19,27 @@ defmodule Cannery.Email do
 
   @spec base_email(User.t(), String.t()) :: t()
   defp base_email(%User{email: email}, subject) do
-    new()
-    |> to(email)
-    |> from({
-      Application.get_env(:cannery, Cannery.Mailer)[:email_name],
-      Application.get_env(:cannery, Cannery.Mailer)[:email_from]
-    })
-    |> subject(subject)
+    from = Application.get_env(:cannery, Cannery.Mailer)[:email_from] || "noreply@localhost"
+    name = Application.get_env(:cannery, Cannery.Mailer)[:email_name]
+    new() |> to(email) |> from({name, from}) |> subject(subject)
   end
 
-  @spec welcome_email(User.t(), String.t()) :: t()
-  def welcome_email(user, url) do
+  @spec generate_email(String.t(), User.t(), attrs :: map()) :: t()
+  def generate_email("welcome", user, %{"url" => url}) do
     user
     |> base_email(dgettext("emails", "Confirm your %{name} account", name: "Cannery"))
     |> render_body("confirm_email.html", %{user: user, url: url})
     |> text_body(EmailView.render("confirm_email.txt", %{user: user, url: url}))
   end
 
-  @spec reset_password_email(User.t(), String.t()) :: t()
-  def reset_password_email(user, url) do
+  def generate_email("reset_password", user, %{"url" => url}) do
     user
     |> base_email(dgettext("emails", "Reset your %{name} password", name: "Cannery"))
     |> render_body("reset_password.html", %{user: user, url: url})
     |> text_body(EmailView.render("reset_password.txt", %{user: user, url: url}))
   end
 
-  @spec update_email(User.t(), String.t()) :: t()
-  def update_email(user, url) do
+  def generate_email("update_email", user, %{"url" => url}) do
     user
     |> base_email(dgettext("emails", "Update your %{name} email", name: "Cannery"))
     |> render_body("update_email.html", %{user: user, url: url})

lib/cannery/accounts/email_worker.ex

@@ -4,10 +4,10 @@ defmodule Cannery.EmailWorker do
   """
 
   use Oban.Worker, queue: :mailers
-  alias Cannery.Mailer
+  alias Cannery.{Accounts, Mailer, Email}
 
   @impl Oban.Worker
-  def perform(%Oban.Job{args: email}) do
-    email |> Mailer.deliver()
+  def perform(%Oban.Job{args: %{"email" => email, "user_id" => user_id, "attrs" => attrs}}) do
+    Email.generate_email(email, user_id |> Accounts.get_user!(), attrs) |> Mailer.deliver()
   end
 end

lib/cannery/mailer.ex

@@ -1,33 +1,40 @@
 defmodule Cannery.Mailer do
   @moduledoc """
   Mailer adapter for emails
+
+  Since emails are loaded as Oban jobs, the `:attrs` map must be serializable to
+  json with Jason, which restricts the use of structs.
   """
 
   use Swoosh.Mailer, otp_app: :cannery
-  alias Cannery.{Accounts.User, Email, EmailWorker}
+  alias Cannery.{Accounts.User, EmailWorker}
   alias Oban.Job
 
   @doc """
   Deliver instructions to confirm account.
   """
-  @spec deliver_confirmation_instructions(User.t(), String.t()) :: {:ok, Job.t()}
-  def deliver_confirmation_instructions(user, url) do
-    {:ok, Email.welcome_email(user, url) |> EmailWorker.new() |> Oban.insert!()}
+  @spec deliver_confirmation_instructions(User.t(), String.t()) :: Job.t()
+  def deliver_confirmation_instructions(%User{id: user_id}, url) do
+    %{email: :welcome, user_id: user_id, attrs: %{url: url}}
+    |> EmailWorker.new()
+    |> Oban.insert!()
   end
 
   @doc """
   Deliver instructions to reset a user password.
   """
-  @spec deliver_reset_password_instructions(User.t(), String.t()) :: {:ok, Job.t()}
-  def deliver_reset_password_instructions(user, url) do
-    {:ok, Email.reset_password_email(user, url) |> EmailWorker.new() |> Oban.insert!()}
+  @spec deliver_reset_password_instructions(User.t(), String.t()) :: Job.t()
+  def deliver_reset_password_instructions(%User{id: user_id}, url) do
+    %{email: :reset_password, user_id: user_id, attrs: %{url: url}}
+    |> EmailWorker.new()
+    |> Oban.insert!()
   end
 
   @doc """
   Deliver instructions to update a user email.
   """
-  @spec deliver_update_email_instructions(User.t(), String.t()) :: {:ok, Job.t()}
-  def deliver_update_email_instructions(user, url) do
-    {:ok, Email.update_email(user, url) |> EmailWorker.new() |> Oban.insert!()}
+  @spec deliver_update_email_instructions(User.t(), String.t()) :: Job.t()
+  def deliver_update_email_instructions(%User{id: user_id}, url) do
+    %{email: :update, user_id: user_id, attrs: %{url: url}} |> EmailWorker.new() |> Oban.insert!()
   end
 end

lib/cannery_web/controllers/user_registration_controller.ex

@@ -62,11 +62,10 @@ defmodule CanneryWeb.UserRegistrationController do
           invite |> Invites.use_invite!()
         end
 
-        {:ok, _} =
-          Accounts.deliver_user_confirmation_instructions(
-            user,
-            &Routes.user_confirmation_url(conn, :confirm, &1)
-          )
+        Accounts.deliver_user_confirmation_instructions(
+          user,
+          &Routes.user_confirmation_url(conn, :confirm, &1)
+        )
 
         conn
         |> put_flash(:info, dgettext("prompts", "User created successfully."))

lib/cannery_web/views/layout_view.ex

@@ -1,7 +1,7 @@
 defmodule CanneryWeb.LayoutView do
   use CanneryWeb, :view
   alias Cannery.Accounts
-  alias CanneryWeb.HomeLive
+  alias CanneryWeb.{Endpoint, HomeLive}
 
   # Phoenix LiveDashboard is available only in development by default,
   # so we instruct Elixir to not warn if the dashboard route is missing.