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An OAuth2 client implementation based on http-client-essentials.

There is a newer version: 0.22.1

/*
 * Copyright (C) 2016 Marten Gajda 
 *
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.dmfs.oauth2.client;

import java.io.IOException;

import org.dmfs.httpessentials.client.HttpRequestExecutor;
import org.dmfs.httpessentials.exceptions.ProtocolError;
import org.dmfs.httpessentials.exceptions.ProtocolException;


/**
 * Interface of an object that knows how to get an access token using a specific OAuth2 grant type.
 * 
 * @author Marten Gajda 
 */
public interface OAuth2Grant
{
	/**
	 * Executes the grant and returns an {@link OAuth2AccessToken}.
	 * 
	 * @param executor
	 *            An {@link HttpRequestExecutor} to execute the request.
	 * @return An {@link OAuth2AccessToken}.
	 * @throws IOException
	 *             If the request failed on a low level.
	 * @throws ProtocolError
	 *             If the server responded with an error that's part of the protocol.
	 * @throws ProtocolException
	 *             If the server returned an invalid response.
	 */
	public OAuth2AccessToken accessToken(HttpRequestExecutor executor) throws IOException, ProtocolError, ProtocolException;
}