OAuth: Exception on retrieveAccessToken() while connecting with yahoo on emulator?

Question

Above error comes when integrated to yahoo

provider define below

code

provider = new CommonsHttpOAuthProvider(
                "https://api.login.yahoo.com/oauth/v2/get_request_token",
                "https://api.login.yahoo.com/oauth/v2/get_token",
                "https://api.login.yahoo.com/oauth/v2/request_auth");

Consumer and Oauth_Verifier

            consumer = new CommonsHttpOAuthConsumer(
                "ppp",
                "lll");

        consumer.setMessageSigner(new HmacSha1MessageSigner());

String oauth_verifier = uri
            .getQueryParameter(OAuth.OAUTH_VERIFIER);

Error shown when try to access token from yahoo api :-

oauth.signpost.exception.OAuthCommunicationException: Communication with the service provider failed: null

when run below code then exception come into above :-

 provider.retrieveAccessToken(consumer, oauth_verifier);

Answer 1

BIG EDIT

I highly recommend not using Signpost unless you have a plan on how to handle the token refresh. Signpost doesn't have methods to make this happen. I switched to Scribe which is much easier to use. Unfortunately It too doesn't have methods to help with Token Refresh, but I was able to write a helper method fairly easily.

I now have the Yahoo API working 100% on Android. If you're not able to figure it out with Signpost and will switch to Scribe I'll post my code.

---

This is working for me from start to finish. I'm also able to reuse a key. Tricky stuff if you do 1 thing out of sequence it breaks. This is a rough version by the way which I intend to clean up. Still have to figure out renewing the token after 60 minutes.

Android Manifest

<activity
    android:name=".UpdaterActivity"
    android:label="@string/app_name"
    android:launchMode="singleInstance" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    <intent-filter> 
        <action android:name="android.intent.action.VIEW" /> 
        <category android:name="android.intent.category.DEFAULT" /> 
        <category android:name="android.intent.category.BROWSABLE" /> 
        <data android:scheme="yfbwa" android:host="oauth"></data> 
    </intent-filter> 
</activity>

UpdaterActivity.java

private static final String CONSUMER_KEY = "";
private static final String CONSUMER_SECRET = "";
private static final String REQUEST_TOKEN_URL = "https://api.login.yahoo.com/oauth/v2/get_request_token";
private static final String ACCESS_TOKEN_URL = "https://api.login.yahoo.com/oauth/v2/get_token";
private static final String AUTHORIZE_WEBSITE_URL = "https://api.login.yahoo.com/oauth/v2/request_auth";
private static final String CALLBACK_URL = "yfbwa://oauth";
private OAuthConsumer consumer;
private OAuthProvider provider;

@Override
protected void onCreate(Bundle savedInstanceState) {
    consumer = new CommonsHttpOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET); 
    provider = new CommonsHttpOAuthProvider(REQUEST_TOKEN_URL, ACCESS_TOKEN_URL, AUTHORIZE_WEBSITE_URL);
    if(getIsAuthorized() == 0) {
        callOAuth();
    } else {
        makeRequest("http://fantasysports.yahooapis.com/fantasy/v2/users;use_login=1/games;game_keys=308/teams?format=json");
    }
}

private void callOAuth() { 
    String url = provider.retrieveRequestToken(consumer, CALLBACK_URL);
    this.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url))); 
}

@Override 
protected void onNewIntent(Intent intent) { 
    Uri data = intent.getData();
    String verifier = data.getQueryParameter(OAuth.OAUTH_VERIFIER);
    provider.retrieveAccessToken(consumer, URLDecoder.decode(verifier,"UTF-8"));
    writePrefs(consumer.getToken(), consumer.getTokenSecret());
    makeRequest("http://fantasysports.yahooapis.com/fantasy/v2/users;use_login=1/games;game_keys=308/teams?format=json");
}

private void makeRequest(String url) throws OAuthMessageSignerException, OAuthNotAuthorizedException, OAuthExpectationFailedException, OAuthCommunicationException, ClientProtocolException, IOException {
    String[] prefs = getPrefs();
    consumer.setTokenWithSecret(prefs[0], prefs[1]);
    HttpClient httpClient = new DefaultHttpClient();
    HttpGet request = new HttpGet(url);
    consumer.sign(request);
    HttpResponse response = httpClient.execute(request);
    String result = EntityUtils.toString(response.getEntity());
}

private void writePrefs(String token, String tokenSecret) {
    Editor prefsEditor = getSharedPreferences("ybfwa", MODE_PRIVATE).edit();
    prefsEditor.putString("token",token);
    prefsEditor.putString("tokenSecret",tokenSecret);
    prefsEditor.putInt("isAuthorized",1);
    prefsEditor.commit();
}

private String[] getPrefs() {
    String[] prefs = new String[2];
    SharedPreferences myPrefs = getSharedPreferences("ybfwa", MODE_PRIVATE);
    prefs[0] = myPrefs.getString("token", null);
    prefs[1] = myPrefs.getString("tokenSecret", null);
    return prefs;
}

private int getIsAuthorized() {
    SharedPreferences myPrefs = getSharedPreferences("ybfwa", MODE_PRIVATE);
    return myPrefs.getInt("isAuthorized", 0);
}