GAE Jersey OAuth2.0

Authentication using OAuth, integrated with Google App Engine and Jersey 1.x servlet container.

Includes token verifiers for Google Sign In and Facebook Login, but you can specify your own implementation.

Extensible as much as possible, so you can swap any class with your own implementation.

Set up

1. Add project dependency.

   • Maven:

   	<dependency>
   		<groupId>me.lazerka.gae-jersey-oauth2</groupId>
   		<artifactId>gae-jersey-oauth2</artifactId>
   		<version>2.3</version>
   	</dependency>

   • Gradle:

   	compile 'me.lazerka.gae-jersey-oauth2:gae-jersey-oauth2:2.3'

2. Install Guice module:

   install(new OauthModule());

   See available OauthModule constructors.

3. Add Jersey parameter:

   parameters.put(ResourceConfig.PROPERTY_RESOURCE_FILTER_FACTORIES, AuthFilterFactory.class.getName())

Usage

Annotate your resources with one of standard javax.annotation.security.* annotations:

• @RolesAllowed(Role.USER)
• @RolesAllowed(Role.ADMIN)
• @RolesAllowed(Role.OPTIONAL)
• @PermitAll
• @DenyAll

To get current user credentials:

import me.lazerka.gae.jersey.oauth2.UserPrincipal;
import javax.annotation.Nullable;
import javax.ws.rs.core.SecurityContext;

public class UserService {
	@Inject
	SecurityContext securityContext;

	@Nullable
	public UserPrincipal getCurrentUserPrincipal() {
		return (UserPrincipal) securityContext.getUserPrincipal();
	}
}

Resources annotated with @PermitAll do not even check authentication, so resources annotated with it will not get any SecurityContext even if user is authenticated. See Role.OPTIONAL.

Customize

You can swap pretty much anything with your own implementation:

• OauthModule is optional, feel free to use your own.
• AuthFilterFactory can be customized by providing your own implementation to Jersey parameters.
• AuthFilter can be customized by binding your own implementation in Guice module: bind(AuthFilter.class).to(MyAuthFilter.class);.
• You can add other providers by adding your own TokenVerifiers using Guice Multibindings (see example OauthModule).