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Google OAuth Client Library for Java. Functionality that works on all supported Java platforms, including Java 5 (or higher) desktop (SE) and web (EE), Android, and Google App Engine.

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/*
 * Copyright (c) 2013 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.http.BasicAuthentication;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpExecuteInterceptor;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;

import java.util.Collection;

/**
 * OAuth 2.0 request for an access token using only its client credentials as specified in Client Credentials Grant.
 *
 * 

* Use {@link Credential} to access protected resources from the resource server using the * {@link TokenResponse} returned by {@link #execute()}. On error, it will instead throw * {@link TokenResponseException}. *

* *

* Sample usage: *

* *
  static void requestAccessToken() throws IOException {
    try {
      TokenResponse response =
          new ClientCredentialsTokenRequest(new NetHttpTransport(), new JacksonFactory(),
              new GenericUrl("https://server.example.com/token"))
              .setRedirectUri("https://client.example.com/rd")
              .setClientAuthentication(
                  new BasicAuthentication("s6BhdRkqt3", "7Fjfp0ZBr1KtDRbnfVdmIw")).execute();
      System.out.println("Access token: " + response.getAccessToken());
    } catch (TokenResponseException e) {
      if (e.getDetails() != null) {
        System.err.println("Error: " + e.getDetails().getError());
        if (e.getDetails().getErrorDescription() != null) {
          System.err.println(e.getDetails().getErrorDescription());
        }
        if (e.getDetails().getErrorUri() != null) {
          System.err.println(e.getDetails().getErrorUri());
        }
      } else {
        System.err.println(e.getMessage());
      }
    }
  }
 * 
* *

* Some OAuth 2.0 providers don't support {@link BasicAuthentication} but instead support * {@link ClientParametersAuthentication}. In the above sample code, simply replace the class name * and it will work the same way. *

* *

* Implementation is not thread-safe. *

* * @since 1.14 * @author Yaniv Inbar */ public class ClientCredentialsTokenRequest extends TokenRequest { /** * @param transport HTTP transport * @param jsonFactory JSON factory * @param tokenServerUrl token server URL */ public ClientCredentialsTokenRequest( HttpTransport transport, JsonFactory jsonFactory, GenericUrl tokenServerUrl) { super(transport, jsonFactory, tokenServerUrl, "client_credentials"); } @Override public ClientCredentialsTokenRequest setRequestInitializer( HttpRequestInitializer requestInitializer) { return (ClientCredentialsTokenRequest) super.setRequestInitializer(requestInitializer); } @Override public ClientCredentialsTokenRequest setTokenServerUrl(GenericUrl tokenServerUrl) { return (ClientCredentialsTokenRequest) super.setTokenServerUrl(tokenServerUrl); } @Override public ClientCredentialsTokenRequest setScopes(Collection scopes) { return (ClientCredentialsTokenRequest) super.setScopes(scopes); } @Override public ClientCredentialsTokenRequest setGrantType(String grantType) { return (ClientCredentialsTokenRequest) super.setGrantType(grantType); } @Override public ClientCredentialsTokenRequest setClientAuthentication( HttpExecuteInterceptor clientAuthentication) { return (ClientCredentialsTokenRequest) super.setClientAuthentication(clientAuthentication); } @Override public ClientCredentialsTokenRequest set(String fieldName, Object value) { return (ClientCredentialsTokenRequest) super.set(fieldName, value); } }




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