Android Open Source - spring-for-android-starter-book Google Web O Auth Activity

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The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 the original author or authors.
 *//from  w ww  .  j  a  v  a2 s  .  c  om
 * 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 net.dahanne.android.google.client;

import org.springframework.social.connect.Connection;
import org.springframework.social.connect.ConnectionRepository;
import org.springframework.social.connect.DuplicateConnectionException;
import org.springframework.social.google.api.Google;
import org.springframework.social.google.connect.GoogleConnectionFactory;
import org.springframework.social.oauth2.AccessGrant;
import org.springframework.social.oauth2.GrantType;
import org.springframework.social.oauth2.OAuth2Parameters;

import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

/**
 *  This class is based on the FacebookWebOAuthActivity by Roy Clarkson
 */
public class GoogleWebOAuthActivity extends AbstractWebViewActivity {

  private static final String TAG = GoogleWebOAuthActivity.class.getSimpleName();

  private ConnectionRepository connectionRepository;

  private GoogleConnectionFactory connectionFactory;

  // ***************************************
  // Activity methods
  // ***************************************
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //javascript is mandatory
    getWebView().getSettings().setJavaScriptEnabled(true);

    // Using a custom web view client to capture the access token
    getWebView().setWebViewClient(new GoogleOAuthWebViewClient());

    this.connectionRepository = getApplicationContext().getConnectionRepository();
    this.connectionFactory = getApplicationContext().getGoogleConnectionFactory();
  }

  @Override
  public void onStart() {
    super.onStart();

    // display the Google authorization page
    getWebView().loadUrl(getAuthorizeUrl());
  }

  // ***************************************
  // Private methods
  // ***************************************
  private String getAuthorizeUrl() {
    String redirectUri = getString(R.string.google_oauth_callback_url);
    String scope = getString(R.string.google_scope);

    // Generate the Google authorization url to be used in the browser or web view
    OAuth2Parameters params = new OAuth2Parameters();
    params.setRedirectUri(redirectUri);
    params.setScope(scope);
    return this.connectionFactory.getOAuthOperations().buildAuthorizeUrl(GrantType.AUTHORIZATION_CODE, params);
  }

  private void displayGoogleOptions() {
    Intent intent = new Intent();
    intent.setClass(this, GoogleActivity.class);
    startActivity(intent);
    finish();
  }

  // ***************************************
  // Private classes
  // ***************************************
  private class GoogleOAuthWebViewClient extends WebViewClient {

    private static final String LOCALHOST = "localhost";
    private static final String CODE = "code";

    /*
     * The WebViewClient has another method called shouldOverridUrlLoading which does not capture the javascript 
     * redirect to the success page. So we're using onPageStarted to capture the url.
     */
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
      // parse the captured url
      Uri uri = Uri.parse(url);
      // log the url : very interesting for debugging the OAuth workflow
      Log.d(TAG, url);
      
      /*
       * The WebViewClient is launched to load an URL from the provider that will ask the user whether or not he accepts our app to access his data.
       * Once the provider successfully gets the approval from the user, it will redirect this WebViewClient to the callback_uri, with a query parameter named "code" : this is the authorization code
       */
      String host = uri.getHost();
      String code = uri.getQueryParameter(CODE);

      
      // The WebViewClient is redirected to the callback_uri, let's trade the authorization code for the access token
      if (LOCALHOST.equals(host)) {
        if(!exchangeAuthorizationCodeForAccessToken.getStatus().equals(AsyncTask.Status.RUNNING)) {
          exchangeAuthorizationCodeForAccessToken.execute(code);
          Toast.makeText(getApplicationContext(), "Redirecting you to the app main activity", Toast.LENGTH_LONG).show();
          //preparing to quit this activity for the main activity
          getWebView().setVisibility(View.INVISIBLE);
        }
      }
    }
  }
  
  
  private AsyncTask<String, Void, Void> exchangeAuthorizationCodeForAccessToken =  new AsyncTask<String, Void, Void>() {
    
    private Exception exception;
    
    @Override
    protected Void doInBackground(String... params) {
      // executed by a background thread
      //params[0] should contain the authorization code
      try {
        AccessGrant exchangeForAccess = connectionFactory.getOAuthOperations().exchangeForAccess(params[0], getString(R.string.google_oauth_callback_url), null);
        Log.d(TAG,"AccessToken  : "+exchangeForAccess.getAccessToken());
        Log.d(TAG,"RefreshToken  : "+exchangeForAccess.getRefreshToken());
        Log.d(TAG,"ExpireTime  : "+exchangeForAccess.getExpireTime());
        
        Connection<Google> connection = connectionFactory.createConnection(exchangeForAccess);
        connectionRepository.addConnection(connection);
      } catch (DuplicateConnectionException e) {
        Log.e(TAG,"something went wrong when adding the accessToken to the connection repository",e);
        exception = e;
      } catch (Exception e) {
        Log.e(TAG,"something went wrong when adding the accessToken to the connection repository",e);
        exception = e;
      }
      return null;
    }
    
    @Override
    protected void onPostExecute(Void result) {
      // executed by the UI thread once the background thread is done getting the result
      if(exception != null) {
        Toast.makeText(getApplicationContext(), exception.getMessage(), Toast.LENGTH_LONG).show();
      }
      // we go back to the main activity to display the options
      displayGoogleOptions();
    }
    
  };
  
}

Java Source Code List

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