feat: db pg adapter: store OTP links

src/identity/adapters/output/db/postgres/create_verification_secret.rs

@@ -0,0 +1,57 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use sqlx::types::time::OffsetDateTime;
+
+use super::DBOutPostgresAdapter;
+use crate::identity::application::port::output::db::{create_verification_secret::*, errors::*};
+
+#[async_trait::async_trait]
+impl CreateVerificationSecretOutDBPort for DBOutPostgresAdapter {
+    async fn create_verification_secret(&self, msg: CreateSecretMsg) -> OutDBPortResult<()> {
+        sqlx::query!(
+            "INSERT INTO verification_otp (secret, created_at, purpose, username)
+            VALUES ($1, $2, $3, $4);",
+            &msg.secret,
+            OffsetDateTime::now_utc(),
+            &msg.purpose,
+            &msg.username,
+        )
+        .execute(&self.pool)
+        .await?;
+        Ok(())
+    }
+}
+
+#[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;
+    }
+}