Hi,
I am trying to create a simple app on the app engine where users log
in through their Google account, and then it adds an event to their
calendar.
And I am using Java along with Eclipse for this. I have found a simple
code online:
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// Create an instance of GoogleOAuthParameters
GoogleOAuthParameters oauthParameters = new
GoogleOAuthParameters();
oauthParameters.setOAuthConsumerKey(CONSUMER_KEY);
oauthParameters.setOAuthConsumerSecret(CONSUMER_SECRET);
oauthParameters.setScope("http://docs.google.com/feeds/";);
GoogleOAuthHelper oauthHelper = new GoogleOAuthHelper(
new OAuthHmacSha1Signer());
// Remember the token secret that we stashed? Let's get it back
// now. We need to add it to oauthParameters
String oauthTokenSecret = (String)
req.getSession().getAttribute(
"oauthTokenSecret");
oauthParameters.setOAuthTokenSecret(oauthTokenSecret);
// The query string should contain the oauth token, so we can
just
// pass the query string to our helper object to correctly
// parse and add the parameters to our instance of
oauthParameters
oauthHelper.getOAuthParametersFromCallback(req.getQueryString(),
oauthParameters);
try {
// Now that we have all the OAuth parameters we need,
we can
// generate an access token and access token secret.
These
// are the values we want to keep around, as they are
// valid for all API calls in the future until a user
revokes
// our access.
String accessToken =
oauthHelper.getAccessToken(oauthParameters);
String accessTokenSecret =
oauthParameters.getOAuthTokenSecret();
// In a real application, we want to redirect the user
to a new
// servlet that makes API calls. For the safe of
clarity and
simplicity,
// we'll just reuse this servlet for making API calls.
oauthParameters = new GoogleOAuthParameters();
oauthParameters.setOAuthConsumerKey(CONSUMER_KEY);
oauthParameters.setOAuthConsumerSecret(CONSUMER_SECRET);
// This is interesting: we set the OAuth token and the
token secret
// to the values extracted by oauthHelper earlier.
These values are
// already in scope in this example code, but they can
be populated
// from reading from the datastore or some other
persistence
mechanism.
oauthParameters.setOAuthToken(accessToken);
oauthParameters.setOAuthTokenSecret(accessTokenSecret);
oauthParameters.setOAuthCallback("http://www.facebook.com";);
oauthHelper.getUnauthorizedRequestToken(oauthParameters);
// Create an instance of the DocsService to make API
calls
DocsService client = new DocsService("Malware Inc.");
// Use our newly built oauthParameters
client.setOAuthCredentials(oauthParameters, new
OAuthHmacSha1Signer());
URL feedUrl = new
URL("https://docs.google.com/feeds/default/
private/full");
DocumentListFeed resultFeed = client.getFeed(feedUrl,
DocumentListFeed.class);
for (DocumentListEntry entry : resultFeed.getEntries())
{
resp.getWriter().println(entry.getTitle().getPlainText());
}
} catch (OAuthException e) {
// Something went wrong. Usually, you'll end up here if
we have
invalid
// oauth tokens
resp.getWriter().println("Here is the problem");
//Server shows 500 problem
} catch (ServiceException e) {
// Handle this exception
}
}
I have registered my application and added the KEY and Secret above
the function, but when I deploy it to the app engine it gives a 500
server error.
Could someone post a simple java program that uses gdata and oauth to
log in a Google user and print the contacts on the screen?
Thanks.
-Manoj
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