Email client, application startup logic and tests

src/configuration.rs

@@ -1,3 +1,4 @@
+use crate::domain::SubscriberEmail;
 use secrecy::{ExposeSecret, SecretString};
 use serde::Deserialize;
 use serde_aux::field_attributes::deserialize_number_from_string;
@@ -58,6 +59,7 @@ impl TryFrom<String> for Environment {
 pub struct Settings {
     pub application: ApplicationSettings,
     pub database: DatabaseSettings,
+    pub email_client: EmailClientSettings,
 }
 
 #[derive(Deserialize)]
@@ -67,6 +69,35 @@ pub struct ApplicationSettings {
     pub host: String,
 }
 
+#[derive(Deserialize)]
+pub struct EmailClientSettings {
+    pub base_url: String,
+    sender_email: String,
+    pub authorization_token: SecretString,
+    pub timeout_milliseconds: u64,
+}
+
+impl EmailClientSettings {
+    pub fn sender(&self) -> Result<SubscriberEmail, String> {
+        SubscriberEmail::parse(self.sender_email.clone())
+    }
+
+    pub fn new(
+        base_url: String,
+        sender_email: String,
+        authorization_token: String,
+        timeout_milliseconds: u64,
+    ) -> Self {
+        let authorization_token = SecretString::from(authorization_token);
+        Self {
+            base_url,
+            sender_email,
+            authorization_token,
+            timeout_milliseconds,
+        }
+    }
+}
+
 #[derive(Deserialize)]
 pub struct DatabaseSettings {
     pub username: String,