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OAuth 2.0 SDK with OpenID Connection extensions for developing client and server applications.

There is a newer version: 11.19.1

package com.nimbusds.oauth2.sdk;


import java.util.LinkedHashMap;
import java.util.Map;

import net.jcip.annotations.Immutable;


/**
 * Client credentials grant. Used in access token requests with a client's
 * identifier and secret.
 *
 * Related specifications:
 *
 * 

 *     OAuth 2.0 (RFC 6749), section 4.4.2.
 * 
 */
@Immutable
public class ClientCredentialsGrant extends AuthorizationGrant {


	/**
	 * The grant type.
	 */
	public static final GrantType GRANT_TYPE = GrantType.CLIENT_CREDENTIALS;


	/**
	 * Creates a new client credentials grant. The actual client
	 * credentials are included in the
	 * {@link com.nimbusds.oauth2.sdk.auth.ClientAuthentication client
	 * authentication} of the {@link com.nimbusds.oauth2.sdk.TokenRequest}.
	 */
	public ClientCredentialsGrant() {

		super(GRANT_TYPE);
	}


	@Override
	public Map toParameters() {

		Map params = new LinkedHashMap<>();
		params.put("grant_type", GRANT_TYPE.getValue());
		return params;
	}


	/**
	 * Parses a client credentials grant from the specified parameters.
	 *
	 * Example:
	 *
	 * 
	 * grant_type=client_credentials
	 * 
	 *
	 * @param params The parameters.
	 *
	 * @return The client credentials grant.
	 *
	 * @throws ParseException If parsing failed.
	 */
	public static ClientCredentialsGrant parse(final Map params)
		throws ParseException {

		// Parse grant type
		String grantTypeString = params.get("grant_type");

		if (grantTypeString == null)
			throw new ParseException("Missing \"grant_type\" parameter", OAuth2Error.INVALID_REQUEST);

		if (! GrantType.parse(grantTypeString).equals(GRANT_TYPE))
			throw new ParseException("The \"grant_type\" must be " + GRANT_TYPE, OAuth2Error.UNSUPPORTED_GRANT_TYPE);

		return new ClientCredentialsGrant();
	}
}