Java tutorial
/* * Copyright 2010-2014 the original author or authors. * * 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.msplearning.android.ext; import org.springframework.social.connect.Connection; import org.springframework.social.connect.ConnectionRepository; import org.springframework.social.connect.DuplicateConnectionException; import org.springframework.social.facebook.api.Facebook; import org.springframework.social.facebook.connect.FacebookConnectionFactory; import org.springframework.social.oauth2.AccessGrant; import org.springframework.social.oauth2.GrantType; import org.springframework.social.oauth2.OAuth2Parameters; import android.annotation.SuppressLint; import android.graphics.Bitmap; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.webkit.CookieManager; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.Toast; import com.msplearning.android.app.MSPLearningApplication; import com.msplearning.android.app.R; import com.msplearning.android.ext.generic.AbstractWebViewActivity; /** * The FacebookWebOAuthActivity class, the activity for OAuth Facebook login. * * @author Roy Clarkson (original author) * @author Venilton Falvo Junior (author of specialized implementations) */ public class FacebookWebOAuthActivity extends AbstractWebViewActivity<MSPLearningApplication> { private static final String TAG = FacebookWebOAuthActivity.class.getSimpleName(); private ConnectionRepository connectionRepository; private FacebookConnectionFactory connectionFactory; // *************************************** // Activity methods // *************************************** @SuppressLint("SetJavaScriptEnabled") @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Facebook uses javascript to redirect to the success page this.getWebView().getSettings().setJavaScriptEnabled(true); // Using a custom web view client to capture the access token this.getWebView().setWebViewClient(new FacebookOAuthWebViewClient()); this.connectionRepository = this.getApplicationContext().getConnectionRepository(); this.connectionFactory = this.getApplicationContext().getFacebookConnectionFactory(); } @Override public void onStart() { super.onStart(); // display the Facebook authorization page this.getWebView().loadUrl(this.getAuthorizeUrl()); } @Override protected void onResume() { super.onResume(); // clear the Facebook session cookie CookieManager.getInstance().removeAllCookie(); } // *************************************** // Private methods // *************************************** private String getAuthorizeUrl() { String redirectUri = this.getString(R.string.facebook_oauth_callback_url); String scope = this.getString(R.string.facebook_scope); /* * Generate the Facebook authorization url to be used in the browser or web view the display=touch parameter * requests the mobile formatted version of the Facebook authorization page */ OAuth2Parameters params = new OAuth2Parameters(); params.setRedirectUri(redirectUri); params.setScope(scope); params.add("display", "touch"); return this.connectionFactory.getOAuthOperations().buildAuthorizeUrl(GrantType.IMPLICIT_GRANT, params); } private void displayDashboard() { // TODO: Implement integration to M-SPLearning } // *************************************** // Private classes // *************************************** private class FacebookOAuthWebViewClient extends WebViewClient { /* * 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.d(TAG, url); /* * The access token is returned in the URI fragment of the URL. See the Desktop Apps section all the way * at the bottom of this link: * * http://developers.facebook.com/docs/authentication/ * * The fragment will be formatted like this: * * #access_token=A&expires_in=0 */ AccessGrant accessGrant = this.createAccessGrantFromUriFragment(uri.getFragment()); if (accessGrant != null) { new CreateConnectionTask().execute(accessGrant); } /* * if there was an error with the oauth process, return the error description * * The error query string will look like this: * * ?error_reason=user_denied&error=access_denied&error_description=The +user+denied+your+request */ if (uri.getQueryParameter("error") != null) { CharSequence errorReason = uri.getQueryParameter("error_description").replace("+", " "); Toast.makeText(FacebookWebOAuthActivity.this.getApplicationContext(), errorReason, Toast.LENGTH_LONG).show(); FacebookWebOAuthActivity.this.displayDashboard(); } } private AccessGrant createAccessGrantFromUriFragment(String uriFragment) { // confirm we have the fragment, and it has an access_token parameter if ((uriFragment != null) && uriFragment.startsWith("access_token=")) { /* * The fragment also contains an "expires_in" parameter. In this * example we requested the offline_access permission, which * basically means the access will not expire, so we're ignoring * it here */ try { // split to get the two different parameters String[] params = uriFragment.split("&"); // split to get the access token parameter and value String[] accessTokenParam = params[0].split("="); // get the access token value String accessToken = accessTokenParam[1]; // create the connection and persist it to the repository return new AccessGrant(accessToken); } catch (Exception e) { // don't do anything if the parameters are not what is expected Log.d(TAG, e.getLocalizedMessage(), e); } } return null; } } private class CreateConnectionTask extends AsyncTask<AccessGrant, Void, Void> { @Override protected Void doInBackground(AccessGrant... params) { if (params[0] != null) { // this method makes a network request to Facebook, so it must run off of the UI thread Connection<Facebook> connection = FacebookWebOAuthActivity.this.connectionFactory .createConnection(params[0]); try { // persist connection to the repository FacebookWebOAuthActivity.this.connectionRepository.addConnection(connection); } catch (DuplicateConnectionException e) { // connection already exists in repository! Log.d(TAG, e.getLocalizedMessage(), e); } } return null; } @Override protected void onPostExecute(Void result) { FacebookWebOAuthActivity.this.displayDashboard(); } } }