69 lines
2.4 KiB
Rust
69 lines
2.4 KiB
Rust
use std::{string, fmt, error};
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use rustc_serialize::{json, base64};
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#[derive(Debug)]
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/// All the errors we can encounter while signing/verifying tokens
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/// and a couple of custom one for when the token we are trying
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/// to verify is invalid
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pub enum Error {
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EncodeJSON(json::EncoderError),
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DecodeBase64(base64::FromBase64Error),
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DecodeJSON(json::DecoderError),
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Utf8(string::FromUtf8Error),
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InvalidToken,
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InvalidSignature,
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WrongAlgorithmHeader
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}
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macro_rules! impl_from_error {
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($f: ty, $e: expr) => {
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impl From<$f> for Error {
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fn from(f: $f) -> Error { $e(f) }
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}
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}
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}
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impl_from_error!(json::EncoderError, Error::EncodeJSON);
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impl_from_error!(base64::FromBase64Error, Error::DecodeBase64);
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impl_from_error!(json::DecoderError, Error::DecodeJSON);
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impl_from_error!(string::FromUtf8Error, Error::Utf8);
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impl error::Error for Error {
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fn description(&self) -> &str {
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match *self {
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Error::EncodeJSON(ref err) => err.description(),
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Error::DecodeBase64(ref err) => err.description(),
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Error::DecodeJSON(ref err) => err.description(),
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Error::Utf8(ref err) => err.description(),
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Error::InvalidToken => "Invalid Token",
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Error::InvalidSignature => "Invalid Signature",
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Error::WrongAlgorithmHeader => "Wrong Algorithm Header",
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}
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}
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fn cause(&self) -> Option<&error::Error> {
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Some(match *self {
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Error::EncodeJSON(ref err) => err as &error::Error,
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Error::DecodeBase64(ref err) => err as &error::Error,
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Error::DecodeJSON(ref err) => err as &error::Error,
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Error::Utf8(ref err) => err as &error::Error,
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ref e => e as &error::Error,
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})
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}
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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Error::EncodeJSON(ref err) => fmt::Display::fmt(err, f),
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Error::DecodeBase64(ref err) => fmt::Display::fmt(err, f),
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Error::DecodeJSON(ref err) => fmt::Display::fmt(err, f),
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Error::Utf8(ref err) => fmt::Display::fmt(err, f),
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Error::InvalidToken => write!(f, "{}", error::Error::description(self)),
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Error::InvalidSignature => write!(f, "{}", error::Error::description(self)),
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Error::WrongAlgorithmHeader => write!(f, "{}", error::Error::description(self)),
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}
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}
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}
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