/* Copyright (c) 2008 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 sample.oauth;

import com.google.gdata.client.GoogleService;

import com.google.gdata.client.authn.oauth.GoogleOAuthHelper;

import com.google.gdata.client.authn.oauth.GoogleOAuthParameters;

import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;

import com.google.gdata.client.authn.oauth.OAuthRsaSha1Signer;

import com.google.gdata.client.authn.oauth.OAuthSigner;

import com.google.gdata.data.BaseEntry;

import com.google.gdata.data.BaseFeed;

import com.google.gdata.data.Feed;

import java.net.URL;

/**

* Sample application using OAuth in the Google Data Java Client. See the

* comments below to learn about the details.

*

*

*/

class OAuthExample {

public static void main(String[] args) throws Exception {

////////////////////////////////////////////////////////////////////////////

// STEP 1: Gather the user's information

////////////////////////////////////////////////////////////////////////////

// This step collects information from the user, such as the consumer key

// and which service to query. This is just a general setup routine, and

// the method by which you collect user information may be different in your

// implementation.

UserInputHelper inputController = new OAuthUserInputHelper();

UserInputVariables variables = inputController.getVariables();

////////////////////////////////////////////////////////////////////////////

// STEP 2: Set up the OAuth objects

////////////////////////////////////////////////////////////////////////////

// You first need to initialize a few OAuth-related objects.

// GoogleOAuthParameters holds all the parameters related to OAuth.

// OAuthSigner is responsible for signing the OAuth base string.

GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();

// Set your OAuth Consumer Key (which you can register at

// https://www.google.com/accounts/ManageDomains).

oauthParameters.setOAuthConsumerKey(variables.getConsumerKey());

// Initialize the OAuth Signer. If you are using RSA-SHA1, you must provide

// your private key as a Base-64 string conforming to the PKCS #8 standard.

// Visit http://code.google.com/apis/gdata/authsub.html#Registered to learn

// more about creating a key/certificate pair. If you are using HMAC-SHA1,

// you must set your OAuth Consumer Secret, which can be obtained at

// https://www.google.com/accounts/ManageDomains.

OAuthSigner signer;

switch (variables.getSignatureMethod()) {

case RSA:

signer = new OAuthRsaSha1Signer(variables.getSignatureKey());

break;

case HMAC:

oauthParameters.setOAuthConsumerSecret(variables.getSignatureKey());

signer = new OAuthHmacSha1Signer();

break;

default:

throw new IllegalArgumentException("Invalid Signature Method");

}

// Finally create a new GoogleOAuthHelperObject. This is the object you

// will use for all OAuth-related interaction.

GoogleOAuthHelper oauthHelper = new GoogleOAuthHelper(signer);

////////////////////////////////////////////////////////////////////////////

// STEP 3: Get the Authorization URL

////////////////////////////////////////////////////////////////////////////

// Set the scope for this particular service.

oauthParameters.setScope(variables.getScope());

// This method also makes a request to get the unauthorized request token,

// and adds it to the oauthParameters object, along with the token secret

// (if it is present).

oauthHelper.getUnauthorizedRequestToken(oauthParameters);

// Get the authorization url. The user of your application must visit

// this url in order to authorize with Google. If you are building a

// browser-based application, you can redirect the user to the authorization

// url.

String requestUrl = oauthHelper.createUserAuthorizationurl(/sitelet?url=https%3A%2F%2Fgithub.com%2Fgoogle%2Fgdata-java-client%2Fblob%2Fmaster%2Fjava%2Fsample%2Foauth%2FoauthParameters);

System.out.println(requestUrl);

System.out.println("Please visit the URL above to authorize your OAuth "

+ "request token. Once that is complete, press any key to "

+ "continue...");

System.in.read();

////////////////////////////////////////////////////////////////////////////

// STEP 4: Get the Access Token

////////////////////////////////////////////////////////////////////////////

// Once the user authorizes with Google, the request token can be exchanged

// for a long-lived access token. If you are building a browser-based

// application, you should parse the incoming request token from the url and

// set it in GoogleOAuthParameters before calling getAccessToken().

String token = oauthHelper.getAccessToken(oauthParameters);

System.out.println("OAuth Access Token: " + token);

System.out.println();

////////////////////////////////////////////////////////////////////////////

// STEP 5: Make an OAuth authorized request to Google

////////////////////////////////////////////////////////////////////////////

// Initialize the variables needed to make the request

URL feedUrl = new url(/sitelet?url=https%3A%2F%2Fgithub.com%2Fgoogle%2Fgdata-java-client%2Fblob%2Fmaster%2Fjava%2Fsample%2Foauth%2Fvariables.getFeedUrl%28));

System.out.println("Sending request to " + feedUrl.toString());

System.out.println();

GoogleService googleService =

new GoogleService(variables.getGoogleServiceName(), "oauth-sample-app");

// Set the OAuth credentials which were obtained from the step above.

googleService.setOAuthCredentials(oauthParameters, signer);

// Make the request to Google

BaseFeed resultFeed = googleService.getFeed(feedUrl, Feed.class);

System.out.println("Response Data:");

System.out.println("=====================================================");

System.out.println("| TITLE: " + resultFeed.getTitle().getPlainText());

if (resultFeed.getEntries().size() == 0) {

System.out.println("|\tNo entries found.");

} else {

for (int i = 0; i < resultFeed.getEntries().size(); i++) {

BaseEntry entry = (BaseEntry) resultFeed.getEntries().get(i);

System.out.println("|\t" + (i + 1) + ": "

+ entry.getTitle().getPlainText());

}

}

System.out.println("=====================================================");

System.out.println();

////////////////////////////////////////////////////////////////////////////

// STEP 6: Revoke the OAuth token

////////////////////////////////////////////////////////////////////////////

System.out.println("Revoking OAuth Token...");

oauthHelper.revokeToken(oauthParameters);

System.out.println("OAuth Token revoked...");

}

}