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POAssertionFlowClient depreceated, trying to use ServiceAccountCredential, but it won't work
 

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  1. POAssertionFlowClient depreceated, trying to use ServiceAccountCredential, but it won't work
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    <p>I've tried creating a DriveService using service account acting on behalf of another user.</p> <p>I've copied this code from google documentation found here <a href="https://developers.google.com/drive/delegation" rel="noreferrer">https://developers.google.com/drive/delegation</a></p> <pre><code> static DriveService BuildService() { X509Certificate2 certificate = new X509Certificate2(SERVICE_ACCOUNT_PKCS12_FILE_PATH, "notasecret", X509KeyStorageFlags.Exportable); var provider = new AssertionFlowClient(GoogleAuthenticationServer.Description, certificate) { ServiceAccountId = SERVICE_ACCOUNT_EMAIL, Scope = DriveService.Scopes.Drive.GetStringValue(), }; var auth = new OAuth2Authenticator&lt;AssertionFlowClient&gt;(provider, AssertionFlowClient.GetState); return new DriveService(auth); } </code></pre> <p>but I get this warning when trying to build the project:</p> <p>Warning 4 'Google.Apis.Authentication.OAuth2.DotNetOpenAuth.AssertionFlowClient' is obsolete: 'AssertionFlowClient is not supported any more and it's going to be removed in 1.7.0-beta. Consider using ServiceAccountCredential from the new Google.Apis.Auth NuGet package.'</p> <p>and I also get this error:</p> <p>Error 11 Argument 1: cannot convert from 'Google.Apis.Authentication.OAuth2.OAuth2Authenticator' to 'Google.Apis.Services.BaseClientService.Initializer'</p> <p>Then I googled ServiceAccountCredential and ended up with this code (derived from this page: <a href="https://code.google.com/p/google-api-dotnet-client/wiki/OAuth2#Service_Accounts" rel="noreferrer">https://code.google.com/p/google-api-dotnet-client/wiki/OAuth2#Service_Accounts</a>)</p> <pre><code>static DriveService BuildService() { X509Certificate2 certificate = new X509Certificate2(SERVICE_ACCOUNT_PKCS12_FILE_PATH, "notasecret", X509KeyStorageFlags.Exportable); ServiceAccountCredential credential = new ServiceAccountCredential( new ServiceAccountCredential.Initializer(SERVICE_ACCOUNT_EMAIL) { User = "someone@mydomain.mygbiz.com", Scopes = new[] { DriveService.Scope.DriveFile } }.FromCertificate(certificate)); var service = new DriveService(new BaseClientService.Initializer() { HttpClientInitializer = credential, ApplicationName = "Drive API Sample", }); return service; } </code></pre> <p>When I try to build this code it seems all fine, but when I run it I get the following error. </p> <p>A first chance exception of type 'System.Security.Cryptography.CryptographicException' occurred in mscorlib.dll</p> <p>Additional information: Det går inte att hitta det begärda objektet. (Translated : The requested object cannot be found)</p> <p>If there is a handler for this exception, the program may be safely continued.</p> <p>The error occurs on this line:</p> <pre><code>X509Certificate2 certificate = new X509Certificate2(SERVICE_ACCOUNT_PKCS12_FILE_PATH, "notasecret", X509KeyStorageFlags.Exportable); </code></pre> <p>Anyone have any ideas?</p> <p>Update 2013 Oct 31 I have tried this code:</p> <pre><code>{ Console.WriteLine("Drive API - Service Account"); Console.WriteLine("=========================="); String serviceAccountEmail = "&lt;some email&gt;@developer.gserviceaccount.com"; var certificate = new X509Certificate2(@"key.p12", "notasecret", X509KeyStorageFlags.Exportable); ServiceAccountCredential credential = new ServiceAccountCredential( new ServiceAccountCredential.Initializer(serviceAccountEmail) { User = "&lt;someuser&gt;@&lt;mydomain&gt;.mygbiz.com", Scopes = new[] { DriveService.Scope.Drive } }.FromCertificate(certificate)); // Create the service. var service = new DriveService(new BaseClientService.Initializer() { HttpClientInitializer = credential, ApplicationName = "DrvMgr", }); Console.WriteLine("Executing listing"); FileList UserFiles = service.Files.List().Execute(); </code></pre> <p>I get this error message:</p> <p>An unhandled exception of type 'Google.Apis.Auth.OAuth2.Responses.TokenResponseException' occurred in Google.Apis.dll</p> <p>Additional information: Error:"access_denied", Description:"", Uri:""</p>
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