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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
library authorization_exception;
import 'dart:io';
import 'dart:uri';
/// An exception raised when OAuth2 authorization fails.
class AuthorizationException implements Exception {
/// The name of the error. Possible names are enumerated in [the spec][].
/// [the spec]:
final String error;
/// The description of the error, provided by the server. Defaults to null.
final String description;
/// A URI for a page that describes the error in more detail, provided by the
/// server. Defaults to null.
final Uri uri;
/// Creates an AuthorizationException.
AuthorizationException(this.error, this.description, this.uri);
/// Provides a string description of the AuthorizationException.
String toString() {
var header = 'OAuth authorization error ($error)';
if (description != null) {
header = '$header: $description';
} else if (uri != null) {
header = '$header: $uri';
return '$header.';