Issue 351: Reimplement OAuth2 - Step 2 (Auth PCL - only data types)

Src/GoogleApis.Auth/OAuth2/BearerToken.cs

+/*
+Copyright 2013 Google Inc
+
+Licensed under the Apache License, Version 2.0(the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+using System;
+using System.Net.Http;
+using System.Net.Http.Headers;
+
+namespace Google.Apis.Auth.OAuth2
+{
+/// <summary>
+/// OAuth 2.0 helper for accessing protected resources using the Bearer toke
n as specified in
+/// http://tools.ietf.org/html/rfc6750.
+/// </summary>
+public class BearerToken
+{
+/// <summary>
+/// Thread-safe OAuth 2.0 method for accessing protected resources using
the Authorization header as specified·
+/// in http://tools.ietf.org/html/rfc6750#section-2.1.
+/// </summary>
+public class AuthorizationHeaderAccessMethod : IAccessMethod
+{
+const string Schema = "Bearer";
+
+public void Intercept(HttpRequestMessage request, string accessToken
)
+{
+request.Headers.Authorization = new AuthenticationHeaderValue(Sc
hema, accessToken);
+}
+
+public string GetAccessToken(HttpRequestMessage request)
+{
+if (request.Headers.Authorization != null && request.Headers.Aut
horization.Scheme == Schema)
+{
+return request.Headers.Authorization.Parameter;
+}
+return null;
+}
+}
+
+/// <summary>
+/// Thread-safe OAuth 2.0 method for accessing protected resources using
an <c>access_token</c> query parameter
+/// as specified in http://tools.ietf.org/html/rfc6750#section-2.3.
+/// </summary>
+public class QueryParameterAccessMethod : IAccessMethod
+{
+const string AccessTokenKey = "access_token";
+
+public void Intercept(HttpRequestMessage request, string accessToken
)
+{
+var uri = request.RequestUri;
+request.RequestUri = new Uri(string.Format("{0}&{1}{2}{3}",
+uri.ToString(), AccessTokenKey, string.IsNullOrEmpty(uri.Que
ry) ? "?" : "&",
+Uri.EscapeDataString(accessToken)));
+}
+
+public string GetAccessToken(HttpRequestMessage request)
+{
+var query = request.RequestUri.Query;
+if (string.IsNullOrEmpty(query))
+{
+return null;
+}
+
+// Remove the '?'.
+query = query.Substring(1);
+foreach (var parameter in query.Split('&'))
+{
+var keyValue = parameter.Split('=');
+if (keyValue[0].Equals(AccessTokenKey))
+{
+return keyValue[1];
+}
+}
+return null;
+}
+}
+}
+}