Parse data from incoming request

src/domain/subscriber_email.rs

@@ -0,0 +1,67 @@
+use validator::Validate;
+
+#[derive(Debug, Validate)]
+pub struct SubscriberEmail {
+    #[validate(email)]
+    email: String,
+}
+
+impl SubscriberEmail {
+    pub fn parse(email: String) -> Result<Self, String> {
+        let subscriber_email = SubscriberEmail { email };
+        subscriber_email
+            .validate()
+            .map_err(|_| format!("{} is not a valid email.", subscriber_email.email))?;
+        Ok(subscriber_email)
+    }
+}
+
+impl AsRef<str> for SubscriberEmail {
+    fn as_ref(&self) -> &str {
+        self.email.as_str()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::SubscriberEmail;
+    use claims::assert_err;
+    use fake::Fake;
+    use fake::faker::internet::en::SafeEmail;
+    use fake::rand::SeedableRng;
+    use fake::rand::rngs::StdRng;
+
+    #[derive(Clone, Debug)]
+    struct ValidEmailFixture(pub String);
+
+    impl quickcheck::Arbitrary for ValidEmailFixture {
+        fn arbitrary(g: &mut quickcheck::Gen) -> Self {
+            let mut rng = StdRng::seed_from_u64(u64::arbitrary(g));
+            let email = SafeEmail().fake_with_rng(&mut rng);
+            Self(email)
+        }
+    }
+
+    #[test]
+    fn empty_string_is_rejected() {
+        let email = "".to_string();
+        assert_err!(SubscriberEmail::parse(email));
+    }
+
+    #[test]
+    fn email_missing_at_symbol_is_rejected() {
+        let email = "alphonse.paixoutlook.com".to_string();
+        assert_err!(SubscriberEmail::parse(email));
+    }
+
+    #[test]
+    fn email_missing_subject_is_rejected() {
+        let email = "@outlook.com".to_string();
+        assert_err!(SubscriberEmail::parse(email));
+    }
+
+    #[quickcheck_macros::quickcheck]
+    fn valid_emails_are_parsed_successfully(valid_email: ValidEmailFixture) -> bool {
+        SubscriberEmail::parse(dbg!(valid_email.0)).is_ok()
+    }
+}