feat: add smtp settings

config/runtime.exs

@@ -223,19 +223,50 @@ if config_env() == :prod do
          {System.get_env("MAIL_FROM_NAME", "Mila"),
           System.get_env("MAIL_FROM_EMAIL", "noreply@example.com")}
 
-  # In production you may need to configure the mailer to use a different adapter.
-  # Also, you may need to configure the Swoosh API client of your choice if you
-  # are not using SMTP. Here is an example of the configuration:
-  #
-  #     config :mv, Mv.Mailer,
-  #       adapter: Swoosh.Adapters.Mailgun,
-  #       api_key: System.get_env("MAILGUN_API_KEY"),
-  #       domain: System.get_env("MAILGUN_DOMAIN")
-  #
-  # For this example you need include a HTTP client required by Swoosh API client.
-  # Swoosh supports Hackney, Req and Finch out of the box:
-  #
-  #     config :swoosh, :api_client, Swoosh.ApiClient.Hackney
-  #
-  # See https://hexdocs.pm/swoosh/Swoosh.html#module-installation for details.
+  # SMTP configuration from environment variables (overrides base adapter in prod).
+  # When SMTP_HOST is set, configure Swoosh to use the SMTP adapter at boot time.
+  # If SMTP is configured only via Settings (Admin UI), the mailer builds the config
+  # per-send at runtime using Mv.Config.smtp_*() helpers.
+  smtp_host_env = System.get_env("SMTP_HOST")
+
+  if smtp_host_env && String.trim(smtp_host_env) != "" do
+    smtp_port_env =
+      case System.get_env("SMTP_PORT") do
+        nil -> 587
+        v -> String.to_integer(String.trim(v))
+      end
+
+    smtp_password_env =
+      case System.get_env("SMTP_PASSWORD") do
+        nil ->
+          case System.get_env("SMTP_PASSWORD_FILE") do
+            nil -> nil
+            path -> path |> File.read!() |> String.trim()
+          end
+
+        v ->
+          v
+      end
+
+    smtp_ssl_mode = System.get_env("SMTP_SSL", "tls")
+
+    smtp_opts =
+      [
+        adapter: Swoosh.Adapters.SMTP,
+        relay: String.trim(smtp_host_env),
+        port: smtp_port_env,
+        username: System.get_env("SMTP_USERNAME"),
+        password: smtp_password_env,
+        ssl: smtp_ssl_mode == "ssl",
+        tls: if(smtp_ssl_mode == "tls", do: :always, else: :never),
+        auth: :always,
+        # Allow self-signed or internal SMTP server certs (OTP 26+ enforces verify_peer with cacerts).
+        # tls_options: STARTTLS (587); sockopts: direct SSL (465).
+        tls_options: [verify: :verify_none],
+        sockopts: [verify: :verify_none]
+      ]
+      |> Enum.reject(fn {_k, v} -> is_nil(v) end)
+
+    config :mv, Mv.Mailer, smtp_opts
+  end
 end