Google Auth Library

Open source authentication client library for Java.

• [API Documentation] (https://google.github.io/google-auth-library-java/releases/0.6.0/apidocs)

This project consists of 3 artifacts:

• google-auth-library-credentials: contains base classes and
  interfaces for Google credentials
• google-auth-library-appengine: contains App Engine
  credentials. This artifacts depends on the App Engine SDK
• google-auth-library-oauth2-http: contains a wide variety of
  credentials as well as utility methods to create them and to get Application Default Credentials

Note: This client is a work-in-progress, and may occasionally
make backwards-incompatible changes.

Quickstart

If you are using Maven, add this to your pom.xml file (notice that you can replace
google-auth-library-oauth2-http with any of google-auth-library-credentials and
google-auth-library-appengine, depending on your application needs):

<dependency>
  <groupId>com.google.auth</groupId>
  <artifactId>google-auth-library-oauth2-http</artifactId>
  <version>0.6.0</version>
</dependency>

If you are using Gradle, add this to your dependencies

compile 'com.google.auth:google-auth-library-oauth2-http:0.6.0'

If you are using SBT, add this to your dependencies

libraryDependencies += "com.google.auth" % "google-auth-library-oauth2-http" % "0.6.0"

google-auth-library-credentials

This artifact contains base classes and interfaces for Google credentials:

• Credentials: base class for an authorized identity. Implementations of this class can be used to
  authorize your application
• RequestMetadataCallback: interface for the callback that receives the result of the asynchronous
  Credentials.getRequestMetadata(URI, Executor, RequestMetadataCallback)
• ServiceAccountSigner: interface for a service account signer. Implementations of this class are
  capable of signing byte arrays using the credentials associated to a Google Service Account

google-auth-library-appengine

This artifact depends on the App Engine SDK (appengine-api-1.0-sdk) and should be used only by
applications running on App Engine. The AppEngineCredentials class allows to authorize your App
Engine application given an instance of AppIdentityService.

google-auth-library-oauth2-http

This artifact contains a wide variety of credentials as well as utility methods to create them and
to get Application Default Credentials.
Credentials classes contained in this artifact are:

• CloudShellCredentials: credentials for Google Cloud Shell built-in service account
• CloudShellCredentials: credentials for Google Compute Engine built-in service account
• OAuth2Credentials: base class for OAuth2-based credentials
• ServiceAccountCredentials: credentials for a Service Account - use a JSON Web Token (JWT) to get
  access tokens
• ServiceAccountJwtAccessCredentials: credentials for a Service Account - use JSON Web Token (JWT)
  directly in the request metadata to provide authorization
• UserCredentials: credentials for a user identity and consent

To get Application Default Credentials use GoogleCredentials.getApplicationDefault() or
GoogleCredentials.getApplicationDefault(HttpTransportFactory). These methods return the
Application Default Credentials which are used to identify and authorize the whole application. The
following are searched (in order) to find the Application Default Credentials:

1. Credentials file pointed to by the GOOGLE_APPLICATION_CREDENTIALS environment variable
2. Credentials provided by the Google Cloud SDK gcloud auth application-default login command
3. Google App Engine built-in credentials
4. Google Cloud Shell built-in credentials
5. Google Compute Engine built-in credentials

To get Credentials from a Service Account JSON key use GoogleCredentials.fromStream(InputStream)
or GoogleCredentials.fromStream(InputStream, HttpTransportFactory).

Contributing

Contributions to this library are always welcome and highly encouraged.

See CONTRIBUTING documentation for more information on how to get started.

Please note that this project is released with a Contributor Code of Conduct. By participating in
this project you agree to abide by its terms. See Code of Conduct for more
information.

License

BSD 3-Clause - See LICENSE for more information.