Add bearer token type

src/token/bearer.rs

@@ -0,0 +1,24 @@
+use hyper::header;
+
+use super::{Token, Lifetime};
+
+/// The bearer token type.
+///
+/// See [RFC6750](http://tools.ietf.org/html/rfc6750).
+pub struct Bearer<L: Lifetime> {
+    access_token: String,
+    scope: Option<String>,
+    lifetime: L,
+}
+
+impl<L: Lifetime> Token<L> for Bearer<L> {
+    fn access_token(&self) -> &str { &self.access_token }
+    fn scope(&self) -> Option<&str> { self.scope.as_ref().map(|s| &s[..]) }
+    fn lifetime(&self) -> &L { &self.lifetime }
+}
+
+impl<'a, L: Lifetime> Into<header::Authorization<header::Bearer>> for &'a Bearer<L> {
+    fn into(self) -> header::Authorization<header::Bearer> {
+        header::Authorization(header::Bearer { token: self.access_token.clone() })
+    }
+}

src/token/mod.rs

@@ -26,3 +26,6 @@ pub trait Lifetime {
     /// Returns true if the token is no longer valid.
     fn expired(&self) -> bool;
 }
+
+pub use self::bearer::Bearer;
+mod bearer;