Implementation for JWT Profile for OAuth 2.0 Client Authentication an…

[junying1]

…d Authorization.

Implementation modelled on ClientParametersAuthentication.

Fixes #580

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[yoshi-code-bot]

Suggested change

	import com.google.api.client.http.GenericUrl;
	import com.google.api.client.http.HttpRequest;
	import com.google.api.client.http.UrlEncodedContent;
	import com.google.api.client.json.jackson2.JacksonFactory;
	import static org.junit.Assert.assertThrows;
	import java.util.Map;

[yoshi-code-bot]

Suggested change

	new ClientCredentialsTokenRequest(new MockHttpTransport(), new JacksonFactory(),
	new GenericUrl(HttpTesting.SIMPLE_GENERIC_URL.toString()));
	JWTAuthentication auth =
	new ClientCredentialsTokenRequest(
	new MockHttpTransport(),
	new JacksonFactory(),
	new GenericUrl(HttpTesting.SIMPLE_GENERIC_URL.toString()));
	JWTAuthentication auth = new JWTAuthentication(JWT);

[yoshi-code-bot]

Suggested change

	JWTAuthentication auth =
	new JWTAuthentication(JWT);
	JWTAuthentication auth = new JWTAuthentication(JWT);

[yoshi-code-bot]

Suggested change

	new ClientCredentialsTokenRequest(new MockHttpTransport(), new JacksonFactory(),
	new GenericUrl(HttpTesting.SIMPLE_GENERIC_URL.toString()));
	JWTAuthentication auth =
	new ClientCredentialsTokenRequest(
	new MockHttpTransport(),
	new JacksonFactory(),
	new GenericUrl(HttpTesting.SIMPLE_GENERIC_URL.toString()));
	JWTAuthentication auth = new JWTAuthentication(JWT);

[junying1]

@googlebot I fixed it.

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[junying1]

Will redo after sorting out CLA issues.