Class ServiceAccountCredential

Google OAuth 2.0 credential for accessing protected resources using an access token. The Google OAuth 2.0 Authorization Server supports server-to-server interactions such as those between a web application and Google Cloud Storage. The requesting application has to prove its own identity to gain access to an API, and an end-user doesn't have to be involved.

Take a look in https://developers.google.com/accounts/docs/OAuth2ServiceAccount for more details.

Since version 1.9.3, service account credential also supports JSON Web Token access token scenario. In this scenario, instead of sending a signed JWT claim to a token server and exchanging it for an access token, a locally signed JWT claim bound to an appropriate URI is used as an access token directly. See GetAccessTokenForRequestAsync(String, CancellationToken) for explanation when JWT access token is used and when regular OAuth2 token is used.

Inheritance
System.Object
ServiceCredential
ServiceAccountCredential
Implements
Google.Apis.Http.IConfigurableHttpClientInitializer
Google.Apis.Http.IHttpExecuteInterceptor
Google.Apis.Http.IHttpUnsuccessfulResponseHandler
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Google.Apis.Auth.OAuth2
Assembly: Google.Apis.Auth.dll
Syntax
public class ServiceAccountCredential : ServiceCredential, ICredential, IConfigurableHttpClientInitializer, ITokenAccess, IHttpExecuteInterceptor, IHttpUnsuccessfulResponseHandler

Constructors

ServiceAccountCredential(ServiceAccountCredential.Initializer)

Constructs a new service account credential using the given initializer.

Declaration
public ServiceAccountCredential(ServiceAccountCredential.Initializer initializer)
Parameters
Type Name Description
ServiceAccountCredential.Initializer initializer

Fields

UnixEpoch

Unix epoch as a DateTime

Declaration
protected static readonly DateTime UnixEpoch
Field Value
Type Description
System.DateTime

Properties

Id

Gets the service account ID (typically an e-mail address).

Declaration
public string Id { get; }
Property Value
Type Description
System.String

Key

Gets the key which is used to sign the request, as specified in https://developers.google.com/accounts/docs/OAuth2ServiceAccount#computingsignature.

Declaration
public RSA Key { get; }
Property Value
Type Description
System.Security.Cryptography.RSA

ProjectId

The project ID associated with this credential.

Declaration
public string ProjectId { get; }
Property Value
Type Description
System.String

Scopes

Gets the service account scopes.

Declaration
public IEnumerable<string> Scopes { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>

User

Gets the email address of the user the application is trying to impersonate in the service account flow or null.

Declaration
public string User { get; }
Property Value
Type Description
System.String

Methods

CreateSignature(Byte[])

Creates a base64 encoded signature for the SHA-256 hash of the specified data.

Declaration
public string CreateSignature(byte[] data)
Parameters
Type Name Description
System.Byte[] data

The data to hash and sign. Must not be null.
Returns
Type Description
System.String

The base-64 encoded signature.

FromServiceAccountData(Stream)

Creates a new ServiceAccountCredential instance from JSON credential data.

Declaration
public static ServiceAccountCredential FromServiceAccountData(Stream credentialData)
Parameters
Type Name Description
System.IO.Stream credentialData

The stream from which to read the JSON key data for a service account. Must not be null.
Returns
Type Description
ServiceAccountCredential

The credentials parsed from the service account key data.
Exceptions
Type Condition
System.InvalidOperationException

The credentialData does not contain valid JSON service account key data.

GetAccessTokenForRequestAsync(String, CancellationToken)

Gets an access token to authorize a request. If authUri is set and this credential has no scopes associated with it, a locally signed JWT access token for given authUri is returned. Otherwise, an OAuth2 access token obtained from token server will be returned. A cached token is used if possible and the token is only refreshed once it's close to its expiry.

Declaration
public override Task<string> GetAccessTokenForRequestAsync(string authUri = null, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.String authUri

The URI the returned token will grant access to.
System.Threading.CancellationToken cancellationToken

The cancellation token.
Returns
Type Description
System.Threading.Tasks.Task<System.String>

The access token.
Overrides

RequestAccessTokenAsync(CancellationToken)

Requests a new token as specified in https://developers.google.com/accounts/docs/OAuth2ServiceAccount#makingrequest.

Declaration
public override Task<bool> RequestAccessTokenAsync(CancellationToken taskCancellationToken)
Parameters
Type Name Description
System.Threading.CancellationToken taskCancellationToken

Cancellation token to cancel operation.
Returns
Type Description
System.Threading.Tasks.Task<System.Boolean>

true if a new token was received successfully.
Overrides

Implements

Google.Apis.Http.IConfigurableHttpClientInitializer
Google.Apis.Http.IHttpExecuteInterceptor
Google.Apis.Http.IHttpUnsuccessfulResponseHandler