Merge branch 'master' of github.com:Keats/rust-jwt

src/errors.rs

@@ -1,4 +1,4 @@
-use std::string;
+use std::{string, fmt, error};
 use rustc_serialize::{json, base64};
 
 #[derive(Debug)]
@@ -28,3 +28,41 @@ impl_from_error!(json::EncoderError, Error::EncodeJSON);
 impl_from_error!(base64::FromBase64Error, Error::DecodeBase64);
 impl_from_error!(json::DecoderError, Error::DecodeJSON);
 impl_from_error!(string::FromUtf8Error, Error::Utf8);
+
+impl error::Error for Error {
+    fn description(&self) -> &str {
+        match *self {
+            Error::EncodeJSON(ref err) => err.description(),
+            Error::DecodeBase64(ref err) => err.description(),
+            Error::DecodeJSON(ref err) => err.description(),
+            Error::Utf8(ref err) => err.description(),
+            Error::InvalidToken => "Invalid Token",
+            Error::InvalidSignature => "Invalid Signature",
+            Error::WrongAlgorithmHeader => "Wrong Algorithm Header",
+        }
+    }
+
+    fn cause(&self) -> Option<&error::Error> {
+        Some(match *self {
+            Error::EncodeJSON(ref err) => err as &error::Error,
+            Error::DecodeBase64(ref err) => err as &error::Error,
+            Error::DecodeJSON(ref err) => err as &error::Error,
+            Error::Utf8(ref err) => err as &error::Error,
+            ref e => e as &error::Error,
+        })
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Error::EncodeJSON(ref err) => fmt::Display::fmt(err, f),
+            Error::DecodeBase64(ref err) => fmt::Display::fmt(err, f),
+            Error::DecodeJSON(ref err) => fmt::Display::fmt(err, f),
+            Error::Utf8(ref err) => fmt::Display::fmt(err, f),
+            Error::InvalidToken => write!(f, "{}", error::Error::description(self)),
+            Error::InvalidSignature => write!(f, "{}", error::Error::description(self)),
+            Error::WrongAlgorithmHeader => write!(f, "{}", error::Error::description(self)),
+        }
+    }
+}