| #region Copyright notice and license |
| |
| // Copyright 2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #endregion |
| |
| using System; |
| using System.Collections.Generic; |
| using System.IO; |
| using System.Security.Cryptography; |
| using System.Threading; |
| using System.Threading.Tasks; |
| |
| using Google.Apis.Auth.OAuth2; |
| using Google.Apis.Auth.OAuth2.Responses; |
| using Newtonsoft.Json.Linq; |
| using Org.BouncyCastle.Crypto.Parameters; |
| using Org.BouncyCastle.Security; |
| |
| namespace Grpc.Auth |
| { |
| // TODO(jtattermusch): Remove this class once possible. |
| /// <summary> |
| /// A temporary placeholder for Google credential from |
| /// Google Auth library for .NET. It emulates the usage pattern |
| /// for Usable auth. |
| /// </summary> |
| public class GoogleCredential |
| { |
| private const string GoogleApplicationCredentialsEnvName = "GOOGLE_APPLICATION_CREDENTIALS"; |
| private const string ClientEmailFieldName = "client_email"; |
| private const string PrivateKeyFieldName = "private_key"; |
| |
| private ServiceCredential credential; |
| |
| private GoogleCredential(ServiceCredential credential) |
| { |
| this.credential = credential; |
| } |
| |
| public static GoogleCredential GetApplicationDefault() |
| { |
| return new GoogleCredential(null); |
| } |
| |
| public bool IsCreateScopedRequired |
| { |
| get |
| { |
| return true; |
| } |
| } |
| |
| public GoogleCredential CreateScoped(IEnumerable<string> scopes) |
| { |
| var credsPath = Environment.GetEnvironmentVariable(GoogleApplicationCredentialsEnvName); |
| if (credsPath == null) |
| { |
| // Default to ComputeCredentials if path to JSON key is not set. |
| // ComputeCredential is not scoped actually, but for our use case it's |
| // fine to treat is as such. |
| return new GoogleCredential(new ComputeCredential(new ComputeCredential.Initializer())); |
| } |
| |
| JObject o1 = JObject.Parse(File.ReadAllText(credsPath)); |
| string clientEmail = o1.GetValue(ClientEmailFieldName).Value<string>(); |
| string privateKeyString = o1.GetValue(PrivateKeyFieldName).Value<string>(); |
| var privateKey = ParsePrivateKeyFromString(privateKeyString); |
| |
| var serviceCredential = new ServiceAccountCredential( |
| new ServiceAccountCredential.Initializer(clientEmail) |
| { |
| Scopes = scopes, |
| Key = privateKey |
| }); |
| return new GoogleCredential(serviceCredential); |
| } |
| |
| public Task<bool> RequestAccessTokenAsync(CancellationToken taskCancellationToken) |
| { |
| return credential.RequestAccessTokenAsync(taskCancellationToken); |
| } |
| |
| public TokenResponse Token |
| { |
| get |
| { |
| return credential.Token; |
| } |
| } |
| |
| internal ServiceCredential InternalCredential |
| { |
| get |
| { |
| return credential; |
| } |
| } |
| |
| private RSACryptoServiceProvider ParsePrivateKeyFromString(string base64PrivateKey) |
| { |
| // TODO(jtattermusch): temporary code to create RSACryptoServiceProvider. |
| base64PrivateKey = base64PrivateKey.Replace("-----BEGIN PRIVATE KEY-----", "").Replace("\n", "").Replace("-----END PRIVATE KEY-----", ""); |
| RsaPrivateCrtKeyParameters key = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(base64PrivateKey)); |
| RSAParameters rsaParameters = DotNetUtilities.ToRSAParameters(key); |
| RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); |
| rsa.ImportParameters(rsaParameters); |
| return rsa; |
| } |
| } |
| } |