feat: mailer adapter: bootstrap smtp client

src/identity/adapters/output/mailer/lettre/account_validation_link.rs

@@ -0,0 +1,65 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use super::*;
+use crate::identity::application::port::output::mailer::{account_validation_link::*, errors::*};
+
+#[async_trait::async_trait]
+impl AccountValidationLinkOutMailerPort for LettreMailer {
+    async fn account_validation_link(
+        &self,
+        to: &str,
+        username: &str,
+        validation_secret: &str,
+    ) -> OutMailerPortResult<()> {
+
+        let email = Message::builder()
+            .from(&self.from)
+            .reply_to(&self.reply_to)
+            .to(to)
+            .subject("Please validate your account on Vanikam") // TODO: use better title
+            .header(ContentType::TEXT_PLAIN)
+            .body(format!(r#"Hello {username},
+            Please click here to validate your Vanikam account: {validation_secret}
+            Warm regards,
+            Vanikam Admin
+            "#)) // TODO: change signature
+            .unwrap();
+            mailer.send(email).await.unwrap();
+
+    }
+}
+// TODO: mailer tests
+
+//#[cfg(test)]
+//mod tests {
+//    use super::*;
+//
+//    #[actix_rt::test]
+//    async fn test_postgres_create_verification_secret() {
+//        let settings = crate::settings::tests::get_settings().await;
+//        let db = super::DBOutPostgresAdapter::new(
+//            sqlx::postgres::PgPool::connect(&settings.database.url)
+//                .await
+//                .unwrap(),
+//        );
+//
+//        let msg = CreateSecretMsgBuilder::default()
+//            .secret("secret".into())
+//            .purpose("purpose".into())
+//            .username("username".into())
+//            .build()
+//            .unwrap();
+//
+//        db.create_verification_secret(msg.clone()).await.unwrap();
+//
+//        // duplicate: secret exists
+//        assert_eq!(
+//            db.create_verification_secret(msg).await.err(),
+//            Some(OutDBPortError::VerificationOTPSecretExists)
+//        );
+//
+//        settings.drop_db().await;
+//    }
+//}

src/identity/adapters/output/mailer/lettre/mod.rs

@@ -0,0 +1,55 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use std::sync::Arc;
+
+use lettre::{
+    message::header::ContentType, transport::smtp::authentication::Credentials, AsyncSmtpTransport,
+    Message, Tokio1Executor,
+};
+
+use crate::settings::Settings;
+
+#[derive(Clone)]
+pub struct LettreMailer {
+    mailer: AsyncSmtpTransport<Tokio1Executor>,
+    from: String,
+    reply_to: String,
+    to: String,
+}
+
+impl LettreMailer {
+    pub async fn new(s: &Settings) -> Self {
+        let email = Message::builder()
+            .from("NoBody <nobody@domain.tld>".parse().unwrap())
+            .reply_to("Yuin <yuin@domain.tld>".parse().unwrap())
+            .to("Hei <hei@domain.tld>".parse().unwrap())
+            .subject("Happy new async year")
+            .header(ContentType::TEXT_PLAIN)
+            .body(String::from("Be happy with async!"))
+            .unwrap();
+
+        let creds = Credentials::new("smtp_username".to_owned(), "smtp_password".to_owned());
+
+        // Open a remote connection to gmail
+        let mailer: AsyncSmtpTransport<Tokio1Executor> =
+            AsyncSmtpTransport::<Tokio1Executor>::relay("smtp.gmail.com")
+                .unwrap()
+                .credentials(creds)
+                .build();
+
+        Self {
+            mailer,
+            from: String::default(), // TODO: create settings module to read config
+            to: String::default(),
+            reply_to: String::default(),
+        }
+
+        // Send the email
+        //    match mailer.send(email).await {
+        //        Ok(_) => println!("Email sent successfully!"),
+        //        Err(e) => panic!("Could not send email: {e:?}"),
+        //    };
+    }
+}

src/identity/adapters/output/mailer/mod.rs

@@ -0,0 +1,5 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+pub mod lettre;

src/identity/adapters/output/mod.rs

@@ -1,3 +1,6 @@
 // SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
 //
 // SPDX-License-Identifier: AGPL-3.0-or-later
+
+pub mod db;
+pub mod mailer;