refactor(labrinth): allow setting SMTP port and TLS

This will help setting up labrinth for local development. You can now use a mock SMTP server such as smtp4dev. The TLS options will stay the same as before if set to `true`, and disabled when `false`.

Depends on modrinth#2883

apps/labrinth/.env.example

@@ -81,6 +81,8 @@ TURNSTILE_SECRET=none
 SMTP_USERNAME=none
 SMTP_PASSWORD=none
 SMTP_HOST=none
+SMTP_PORT=25
+SMTP_TLS=true
 
 SITE_VERIFY_EMAIL_PATH=none
 SITE_RESET_PASSWORD_PATH=none
@@ -105,4 +107,4 @@ STRIPE_WEBHOOK_SECRET=none
 
 ADITUDE_API_KEY=none
 
-PYRO_API_KEY=none
+PYRO_API_KEY=none

apps/labrinth/src/auth/email/mod.rs

@@ -1,6 +1,7 @@
 use lettre::message::header::ContentType;
 use lettre::message::Mailbox;
 use lettre::transport::smtp::authentication::Credentials;
+use lettre::transport::smtp::client::{Tls, TlsParameters};
 use lettre::{Address, Message, SmtpTransport, Transport};
 use thiserror::Error;
 
@@ -34,9 +35,20 @@ pub fn send_email_raw(
     let username = dotenvy::var("SMTP_USERNAME")?;
     let password = dotenvy::var("SMTP_PASSWORD")?;
     let host = dotenvy::var("SMTP_HOST")?;
+    let port = dotenvy::var("SMTP_PORT")?.parse::<u16>().unwrap_or(25);
     let creds = Credentials::new(username, password);
+    let tls_settings =
+        if dotenvy::var("SMTP_TLS")?.parse::<bool>().unwrap_or(true) {
+            Tls::Wrapper(TlsParameters::new(host.clone().into())?)
+        } else {
+            Tls::None
+        };
 
-    let mailer = SmtpTransport::relay(&host)?.credentials(creds).build();
+    let mailer = SmtpTransport::relay(&host)?
+        .port(port)
+        .tls(tls_settings)
+        .credentials(creds)
+        .build();
 
     mailer.send(&email)?;
 

apps/labrinth/src/lib.rs

@@ -455,6 +455,8 @@ pub fn check_env_vars() -> bool {
     failed |= check_var::<String>("SMTP_USERNAME");
     failed |= check_var::<String>("SMTP_PASSWORD");
     failed |= check_var::<String>("SMTP_HOST");
+    failed |= check_var::<u16>("SMTP_PORT");
+    failed |= check_var::<bool>("SMTP_TLS");
 
     failed |= check_var::<String>("SITE_VERIFY_EMAIL_PATH");
     failed |= check_var::<String>("SITE_RESET_PASSWORD_PATH");