actix-tls release candidate prep (#422)

actix-tls/src/connect/host.rs

@@ -0,0 +1,71 @@
+//! The [`Host`] trait.
+
+/// An interface for types where host parts (hostname and port) can be derived.
+///
+/// The [WHATWG URL Standard] defines the terminology used for this trait and its methods.
+///
+/// ```plain
+/// +------------------------+
+/// |          host          |
+/// +-----------------+------+
+/// |    hostname     | port |
+/// |                 |      |
+/// | sub.example.com : 8080 |
+/// +-----------------+------+
+/// ```
+///
+/// [WHATWG URL Standard]: https://url.spec.whatwg.org/
+pub trait Host: Unpin + 'static {
+    /// Extract hostname.
+    fn hostname(&self) -> &str;
+
+    /// Extract optional port.
+    fn port(&self) -> Option<u16> {
+        None
+    }
+}
+
+impl Host for String {
+    fn hostname(&self) -> &str {
+        self.split_once(':')
+            .map(|(hostname, _)| hostname)
+            .unwrap_or(self)
+    }
+
+    fn port(&self) -> Option<u16> {
+        self.split_once(':').and_then(|(_, port)| port.parse().ok())
+    }
+}
+
+impl Host for &'static str {
+    fn hostname(&self) -> &str {
+        self.split_once(':')
+            .map(|(hostname, _)| hostname)
+            .unwrap_or(self)
+    }
+
+    fn port(&self) -> Option<u16> {
+        self.split_once(':').and_then(|(_, port)| port.parse().ok())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    macro_rules! assert_connection_info_eq {
+        ($req:expr, $hostname:expr, $port:expr) => {{
+            assert_eq!($req.hostname(), $hostname);
+            assert_eq!($req.port(), $port);
+        }};
+    }
+
+    #[test]
+    fn host_parsing() {
+        assert_connection_info_eq!("example.com", "example.com", None);
+        assert_connection_info_eq!("example.com:8080", "example.com", Some(8080));
+        assert_connection_info_eq!("example:8080", "example", Some(8080));
+        assert_connection_info_eq!("example.com:false", "example.com", None);
+        assert_connection_info_eq!("example.com:false:false", "example.com", None);
+    }
+}