63 lines
2.6 KiB
C#
63 lines
2.6 KiB
C#
/*
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Copyright 2013 Google Inc
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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using System;
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using System.Threading.Tasks;
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using Google.Apis.Auth.OAuth2.Responses;
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using Google.Apis.Util.Store;
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namespace Google.Apis.Auth.OAuth2.Web
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{
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/// <summary>Auth Utility methods for web development.</summary>
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public class AuthWebUtility
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{
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/// <summary>Extracts the redirect URI from the state OAuth2 parameter.</summary>
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/// <remarks>
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/// If the data store is not <c>null</c>, this method verifies that the state parameter which was returned
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/// from the authorization server is the same as the one we set before redirecting to the authorization server.
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/// </remarks>
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/// <param name="dataStore">The data store which contains the original state parameter.</param>
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/// <param name="userId">User identifier.</param>
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/// <param name="state">
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/// The authorization state parameter which we got back from the authorization server.
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/// </param>
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/// <returns>Redirect URI to the address which initializes the authorization code flow.</returns>
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public static async Task<string> ExtracRedirectFromState(IDataStore dataStore, string userId, string state)
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{
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var oauthState = state;
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if (dataStore != null)
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{
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var userKey = AuthorizationCodeWebApp.StateKey + userId;
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var expectedState = await dataStore.GetAsync<string>(userKey).ConfigureAwait(false);
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// Verify that the stored state is equal to the one we got back from the authorization server.
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if (!Object.Equals(oauthState, expectedState))
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{
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throw new TokenResponseException(new TokenErrorResponse
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{
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Error = "State is invalid"
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});
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}
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await dataStore.DeleteAsync<string>(userKey).ConfigureAwait(false);
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oauthState = oauthState.Substring(0, oauthState.Length - AuthorizationCodeWebApp.StateRandomLength);
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}
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return oauthState;
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}
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}
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}
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