2-legged OAuth and the Gmail atom feed

We're trying to get 2-legged OAuth to work with the Gmail atom feed. We're using the Java library contributed by John Kristian, Praveen Alavilli and Dirk Balfanz. [http://oauth.net/code/] instead of the GData library.

We know we have the correct CONSUMER_KEY and CONSUMER_SECRET, etc. becuase it works with the Contacts feed (http://www.google.com/m8/feeds/contacts/default/full) and have no problems. However with Gmail atom feed it always returns: HTTP/1.1 401 Unauthorized

Any ideas? Should we try a different OAuth framework or does the problem lie on the Google side?


We think we got it working with the OAuth libraries but not with the GData library.

Snippet of code is:

import static net.oauth.OAuth.HMAC_SHA1;                                                       
import static net.oauth.OAuth.OAUTH_SIGNATURE_METHOD;                                          

import java.net.URL;
import java.util.List;
import java.util.Map; 

import net.oauth.OAuthAccessor;
import net.oauth.OAuthConsumer;
import net.oauth.OAuthMessage; 
import net.oauth.ParameterStyle;
import net.oauth.SimpleOAuthValidator;
import net.oauth.client.OAuthClient;  
import net.oauth.client.httpclient4.HttpClient4;

 * Sample application demonstrating how to do 2-Legged OAuth in the Google Data
 * Java Client.  See the comments below to learn about the details.            
public class GmailAtomFeed2LeggedOauth {                                       

    public static String CONSUMER_KEY = "test-1001.com";
    public static String CONSUMER_SECRET = "zN0ttehR3@lSecr3+";
    public static String SCOPE = "https://mail.google.com/mail/feed/atom";
    public static String RESOURCE_URL = "https://mail.google.com/mail/feed/atom";
    public static String SERVICE_NAME = "mail";                                  
    public static String username = "username";                                  
    public static boolean debug = true;                                          

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

        // This should be passed in as a parameter
        String user = username + "@" + CONSUMER_KEY;

        OAuthConsumer consumer = new OAuthConsumer(null, CONSUMER_KEY, CONSUMER_SECRET, null);
        OAuthAccessor accessor = new OAuthAccessor(consumer);                                 

        // HMAC uses the access token secret as a factor,
        // and it's a little less compute-intensive than RSA.
        accessor.consumer.setProperty(OAUTH_SIGNATURE_METHOD, HMAC_SHA1);

        // Gmail only supports an atom feed
        URL atomFeedUrl = new URL(SCOPE +"?xoauth_requestor_id=" + user);

        System.out.println("Building new request message...");

        OAuthMessage request = accessor.newRequestMessage(OAuthMessage.GET, atomFeedUrl.toString(),null);

        if (debug) {
            List<Map.Entry<String, String>> params = request.getParameters();
            for (Map.Entry<String, String> p : params) {
                System.out.println("'" + p.getKey() + "' =  <" + p.getValue() + ">");
            System.out.println("Validating message...");
            SimpleOAuthValidator validator=new SimpleOAuthValidator();

        OAuthClient client = new OAuthClient(new HttpClient4());

        System.out.println("Client invoking request message...");
        System.out.println(" request: " + request);
        OAuthMessage message = client.invoke(request, ParameterStyle.AUTHORIZATION_HEADER);

        System.out.println(" message: " + message.readBodyAsString());

Put the OAuth data in the Authorization header, not on the URI.

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