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Google API Client Library for Java. Supports Java 5 (or higher) desktop (SE) and web (EE), Android, and Google App Engine.

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/*
 * Copyright (c) 2010 Google Inc.
 * 
 * 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 com.google.api.client.auth.oauth2;

import com.google.api.client.util.Key;

/**
 * OAuth 2.0 Assertion Flow: request an access token based on as assertion as
 * specified in Assertion.
 * 
 * The {@link #clientId}, {@link #clientSecret}, {@link #assertionType}, and
 * {@link #assertion} fields are required. Call {@link #execute()} to execute
 * the request.
 * 

 * Sample usage:
 * 
 * 
 * static void requestAccessToken(String assertion) throws IOException {
 *   try {
 *     AssertionAccessTokenRequest request
 *         = new AssertionAccessTokenRequest();
 *     request.clientId = CLIENT_ID;
 *     request.clientSecret = CLIENT_SECRET;
 *     request.assertionType = ASSERTION_TYPE;
 *     request.assertion = assertion;
 *     AccessTokenResponse response =
 *         request.execute().parseAs(AccessTokenResponse.class);
 *     System.out.println("Access token: " + response.accessToken);
 *   } catch (HttpResponseException e) {
 *     AccessTokenErrorResponse response =
 *         e.response.parseAs(AccessTokenErrorResponse.class);
 *     System.out.println("Error: " + response.error);
 *   }
 * }
 * 
 * 
 * @since 1.0
 * @author Yaniv Inbar
 */
public class AssertionAccessTokenRequest extends AccessTokenRequest {

  /**
   * (REQUIRED) The format of the assertion as defined by the authorization
   * server. The value MUST be an absolute URI.
   */
  @Key("assertion_type")
  public String assertionType;

  /** (REQUIRED) The assertion. */
  @Key
  public String assertion;

  /**
   * (OPTIONAL) The scope of the access request expressed as a list of
   * space-delimited strings. The value of the "scope" parameter is defined by
   * the authorization server. If the value contains multiple space-delimited
   * strings, their order does not matter, and each string adds an additional
   * access range to the requested scope.
   */
  public String scope;

  /**
   * @param encodedAuthorizationServerUrl encoded authorization server URL
   */
  public AssertionAccessTokenRequest(String encodedAuthorizationServerUrl) {
    super(encodedAuthorizationServerUrl);
  }
}