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Tilman
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/* Copyright (c) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package sample.oauth;
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import com.google.gdata.client.GoogleService;
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import com.google.gdata.client.authn.oauth.GoogleOAuthHelper;
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import com.google.gdata.client.authn.oauth.GoogleOAuthParameters;
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import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;
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import com.google.gdata.client.authn.oauth.OAuthRsaSha1Signer;
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import com.google.gdata.client.authn.oauth.OAuthSigner;
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import com.google.gdata.data.BaseEntry;
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import com.google.gdata.data.BaseFeed;
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import com.google.gdata.data.Feed;
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import java.net.URL;
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/**
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* Sample application using OAuth in the Google Data Java Client. See the
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* comments below to learn about the details.
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*
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*
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*/
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class OAuthExample {
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public static void main(String[] args) throws Exception {
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////////////////////////////////////////////////////////////////////////////
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// STEP 1: Gather the user's information
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////////////////////////////////////////////////////////////////////////////
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// This step collects information from the user, such as the consumer key
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// and which service to query. This is just a general setup routine, and
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// the method by which you collect user information may be different in your
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// implementation.
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UserInputHelper inputController = new OAuthUserInputHelper();
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UserInputVariables variables = inputController.getVariables();
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////////////////////////////////////////////////////////////////////////////
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// STEP 2: Set up the OAuth objects
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////////////////////////////////////////////////////////////////////////////
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// You first need to initialize a few OAuth-related objects.
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// GoogleOAuthParameters holds all the parameters related to OAuth.
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// OAuthSigner is responsible for signing the OAuth base string.
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GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
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// Set your OAuth Consumer Key (which you can register at
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// https://www.google.com/accounts/ManageDomains).
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oauthParameters.setOAuthConsumerKey(variables.getConsumerKey());
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// Initialize the OAuth Signer. If you are using RSA-SHA1, you must provide
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// your private key as a Base-64 string conforming to the PKCS #8 standard.
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// Visit http://code.google.com/apis/gdata/authsub.html#Registered to learn
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// more about creating a key/certificate pair. If you are using HMAC-SHA1,
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// you must set your OAuth Consumer Secret, which can be obtained at
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// https://www.google.com/accounts/ManageDomains.
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OAuthSigner signer;
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switch (variables.getSignatureMethod()) {
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case RSA:
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signer = new OAuthRsaSha1Signer(variables.getSignatureKey());
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break;
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case HMAC:
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oauthParameters.setOAuthConsumerSecret(variables.getSignatureKey());
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signer = new OAuthHmacSha1Signer();
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break;
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default:
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throw new IllegalArgumentException("Invalid Signature Method");
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}
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// Finally create a new GoogleOAuthHelperObject. This is the object you
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// will use for all OAuth-related interaction.
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GoogleOAuthHelper oauthHelper = new GoogleOAuthHelper(signer);
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////////////////////////////////////////////////////////////////////////////
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// STEP 3: Get the Authorization URL
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////////////////////////////////////////////////////////////////////////////
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// Set the scope for this particular service.
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oauthParameters.setScope(variables.getScope());
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// This method also makes a request to get the unauthorized request token,
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// and adds it to the oauthParameters object, along with the token secret
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// (if it is present).
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oauthHelper.getUnauthorizedRequestToken(oauthParameters);
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// Get the authorization url. The user of your application must visit
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// this url in order to authorize with Google. If you are building a
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// browser-based application, you can redirect the user to the authorization
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// url.
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String requestUrl = oauthHelper.createUserAuthorizationUrl(oauthParameters);
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System.out.println(requestUrl);
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System.out.println("Please visit the URL above to authorize your OAuth "
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+ "request token. Once that is complete, press any key to "
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+ "continue...");
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System.in.read();
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////////////////////////////////////////////////////////////////////////////
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// STEP 4: Get the Access Token
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////////////////////////////////////////////////////////////////////////////
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// Once the user authorizes with Google, the request token can be exchanged
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// for a long-lived access token. If you are building a browser-based
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// application, you should parse the incoming request token from the url and
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// set it in GoogleOAuthParameters before calling getAccessToken().
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String token = oauthHelper.getAccessToken(oauthParameters);
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System.out.println("OAuth Access Token: " + token);
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System.out.println();
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////////////////////////////////////////////////////////////////////////////
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// STEP 5: Make an OAuth authorized request to Google
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////////////////////////////////////////////////////////////////////////////
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// Initialize the variables needed to make the request
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URL feedUrl = new URL(variables.getFeedUrl());
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System.out.println("Sending request to " + feedUrl.toString());
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System.out.println();
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GoogleService googleService =
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new GoogleService(variables.getGoogleServiceName(), "oauth-sample-app");
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// Set the OAuth credentials which were obtained from the step above.
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googleService.setOAuthCredentials(oauthParameters, signer);
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// Make the request to Google
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BaseFeed resultFeed = googleService.getFeed(feedUrl, Feed.class);
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System.out.println("Response Data:");
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System.out.println("=====================================================");
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System.out.println("| TITLE: " + resultFeed.getTitle().getPlainText());
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if (resultFeed.getEntries().size() == 0) {
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System.out.println("|\tNo entries found.");
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} else {
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for (int i = 0; i < resultFeed.getEntries().size(); i++) {
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BaseEntry entry = (BaseEntry) resultFeed.getEntries().get(i);
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System.out.println("|\t" + (i + 1) + ": "
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+ entry.getTitle().getPlainText());
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}
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}
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System.out.println("=====================================================");
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System.out.println();
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////////////////////////////////////////////////////////////////////////////
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// STEP 6: Revoke the OAuth token
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////////////////////////////////////////////////////////////////////////////
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System.out.println("Revoking OAuth Token...");
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oauthHelper.revokeToken(oauthParameters);
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System.out.println("OAuth Token revoked...");
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}
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}
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