twitter-oauth-example.txt

AsyncHttpClient signature calculator example for twitter oauth:

ConsumerKey clientAuth = new ConsumerKey(APP_TOKEN, APP_SECRET);
SignatureCalculator REQUEST_TOKEN_CALC = new OAuthSignatureCalculator(clientAuth, new RequestToken("", ""));
ListenableFuture<AuthData> f = asyncClient.preparePost("https://api.twitter.com/oauth/request_token")
                    .setSignatureCalculator(REQUEST_TOKEN_CALC)
                    .addParameter("oauth_callback", "http://myserver/oauth_response")
                    .execute(handler);
AuthData auth = f.get();//parses oauth_token & oauth_secret

at this point, I store oauth token&secret & redirect user to twitter login;
they get redirected back to the oauth_callback address with the token I supplied
plus an oauth_verifier.
I then do:

RequestToken userAuth = new RequestToken(token, secret);
SignatureCalculator calc = new OAuthSignatureCalculator(clientAuth, userAuth);
client.preparePost("https://api.twitter.com/oauth/access_token")
    .addParameter("oauth_verifier", verifier)
    .setSignatureCalculator(calc)
    .execute(handler)
which gets me the access token.