Add expiring token lifetime

src/token/expiring.rs

@@ -0,0 +1,23 @@
+use chrono::{DateTime, UTC};
+
+use super::Lifetime;
+
+/// An expiring token.
+pub struct Expiring {
+    refresh_token: String,
+    expires: DateTime<UTC>,
+}
+
+impl Expiring {
+    /// Returns the refresh token.
+    ///
+    /// See [RFC 6749, section 1.5](http://tools.ietf.org/html/rfc6749#section-1.5).
+    pub fn refresh_token(&self) -> &str { &self.refresh_token }
+
+    /// Returns the expiry time of the access token.
+    pub fn expires(&self) -> &DateTime<UTC> { &self.expires }
+}
+
+impl Lifetime for Expiring {
+    fn expired(&self) -> bool { self.expires < UTC::now() }
+}

src/token/mod.rs

@@ -23,7 +23,7 @@ pub trait Token<L: Lifetime> {
 
 /// OAuth 2.0 token lifetimes.
 pub trait Lifetime {
-    /// Returns true if the token is no longer valid.
+    /// Returns true if the access token is no longer valid.
     fn expired(&self) -> bool;
 }
 
@@ -32,3 +32,6 @@ mod bearer;
 
 pub use self::statik::Static;
 mod statik;
+
+pub use self::expiring::Expiring;
+mod expiring;