Turn on transactional emails with loops

.env.example

@@ -28,4 +28,7 @@ ENCRYPTION_KEY_DERIVATION_SALT=generate_a_salt_and_put_it_here
 SMTP_USER_NAME=replace_with_your_smtp_username
 SMTP_PASSWORD=replace_with_your_smtp_password
 SMTP_ADDRESS=replace_with_your_smtp_address
-SMTP_PORT=replace_with_your_smtp_port
+SMTP_PORT=replace_with_your_smtp_port
+
+# some emails are sent via loops.so– again, not needed for local development
+LOOPS_API_KEY=your_loops_api_key_here

app/controllers/sessions_controller.rb

@@ -35,25 +35,17 @@ class SessionsController < ApplicationController
 
   def email
     email = params[:email].downcase
-    email_address = EmailAddress.find_by(email: email)
 
-    if email_address
-      # Existing user - send sign in link
-      token = email_address.user.create_email_signin_token
-      AuthMailer.sign_in_email(email_address, token).deliver_later
-      redirect_to root_path(sign_in_email: true), notice: "Check your email for a sign-in link!"
-    else
-      # New user - create account and send sign in link
-      user = User.create!(
-        username: email.split("@").first,
-      )
-
-      email_address = user.email_addresses.create!(email: email)
-      token = user.create_email_signin_token
-      AuthMailer.sign_in_email(email_address, token).deliver_later
-
-      redirect_to root_path(sign_in_email: true), notice: "Welcome! Check your email for a sign-in link!"
+    # Use a transaction to ensure both user and email are created atomically
+    email_address = ActiveRecord::Base.transaction do
+      EmailAddress.find_by(email: email) || begin
+        user = User.create!
+        user.email_addresses.create!(email: email)
+      end
     end
+
+    LoopsMailer.sign_in_email(email_address).deliver_later
+    redirect_to root_path(sign_in_email: true)
   end
 
   def token

app/mailers/loops_mailer.rb

@@ -0,0 +1,22 @@
+class LoopsMailer < ApplicationMailer
+  # Override the default mailer settings to use Loops.so SMTP
+  self.delivery_method = :smtp
+  self.smtp_settings = {
+    address: "smtp.loops.so",
+    port: 587,
+    user_name: "loops",
+    password: ENV["LOOPS_API_KEY"],
+    authentication: "plain",
+    enable_starttls: true
+  }
+
+  def sign_in_email(email_address)
+    @email = email_address.email
+    @token = email_address.user.create_email_signin_token.token
+    @sign_in_url = auth_token_url(@token)
+
+    mail(
+      to: @email,
+    )
+  end
+end

app/models/user.rb

@@ -3,7 +3,6 @@ class User < ApplicationRecord
   encrypts :slack_access_token
 
   validates :slack_uid, uniqueness: true, allow_nil: true
-  validates :username, presence: true
 
   has_many :heartbeats
   has_many :email_addresses

app/views/auth_mailer/sign_in_email.html.erb

@@ -18,4 +18,4 @@
       If you didn't request this email, you can safely ignore it.
     </p>
   </body>
-</html> 
+</html>

app/views/loops_mailer/sign_in_email.text.erb

@@ -0,0 +1,7 @@
+{
+  "transactionalId": "cm86bg9vd00xuddjuh5u5mfuu",
+  "email": "<%= @email %>",
+  "dataVariables": {
+    "auth_link": "<%= @sign_in_url %>"
+  }
+}