Develop Reference

How multiple users use google cloud speech at the same time

I'm building an app that uses Google Cloud Speech.
I have a Google Service account key in my app, and I use it to call the API.
It works well when used by one user, but does not work when multiple users use it at the same time.
For example, only one user is available or all are unavailable.
The rights of the service account key are project owner.
I think it's a service account key issue...
How do I fix it?
private class AccessTokenTask extends AsyncTask<Void, Void, AccessToken> {
#Override
protected AccessToken doInBackground(Void... voids) {
final SharedPreferences prefs = mContext.getSharedPreferences(PREFS, Context.MODE_PRIVATE);
String tokenValue = prefs.getString(PREF_ACCESS_TOKEN_VALUE, null);
long expirationTime = prefs.getLong(PREF_ACCESS_TOKEN_EXPIRATION_TIME, -1);
// Check if the current token is still valid for a while
if (tokenValue != null && expirationTime > 0) {
if (expirationTime > System.currentTimeMillis() + ACCESS_TOKEN_EXPIRATION_TOLERANCE) {
return new AccessToken(tokenValue, new Date(expirationTime));
}
}
final InputStream stream = mContext.getResources().openRawResource(R.raw.credential);
try {
final GoogleCredentials credentials = GoogleCredentials.fromStream(stream).createScoped(SCOPE);
final AccessToken token = credentials.refreshAccessToken();
prefs.edit()
.putString(PREF_ACCESS_TOKEN_VALUE, token.getTokenValue())
.putLong(PREF_ACCESS_TOKEN_EXPIRATION_TIME, token.getExpirationTime().getTime())
.apply();
return token;
} catch (IOException e) {
Log.e(TAG, "Failed to obtain access token.", e);
}
return null;
}
#Override
protected void onPostExecute(AccessToken accessToken) {
mAccessTokenTask = null;
final ManagedChannel channel = new OkHttpChannelProvider()
.builderForAddress(GOOGLE_API_HOSTNAME, GOOGLE_API_PORT)
.nameResolverFactory(new DnsNameResolverProvider())
.intercept(new GoogleCredentialsInterceptor(new GoogleCredentials(accessToken)
.createScoped(SCOPE)))
.build();
mApi = SpeechGrpc.newStub(channel);
// Schedule access token refresh before it expires
if (mHandler != null) {
mHandler.postDelayed(mFetchAccessTokenRunnable,
Math.max(accessToken.getExpirationTime().getTime() - System.currentTimeMillis() - ACCESS_TOKEN_FETCH_MARGIN, ACCESS_TOKEN_EXPIRATION_TOLERANCE));
}
}
}
This code is the code that calls 'credential.json' file on Android and gets 'Access token'.
The server for this app is python and communicates via http.
https://github.com/GoogleCloudPlatform/android-docs-samples/tree/master/speech/Speech
The description in the link above tells you to delegate the authentication to the server.
I want to write that part with python code.
What should I do?

In the link you provided in the description, they suggest you to read first the basic authentication concepts document. In your case, use a service account for the Android application.
I understand that you have already been able to provide end user credentials to a Google Cloud Platform API, as for example Cloud Speech API.
If you want to authenticate multiple users to your application you should use instead Firebase authentication. The link contains a brief explanation and a tutorial.
There are several Python client libraries for GCP that you can use, depending on what operations do you want to perform on the server. And regarding Python authentication on the server side, this documentation shows how the authentication for Google Cloud Storage works (have this example in mind as a reference).

Failure to generate Uber oauth Token UnauthorizedException

I'm using the oauth2-essentials library because it was one of the recommended oauth libraries on the uber developers site, and it has been recently updated.
My code looks like this:
executor = new HttpUrlConnectionExecutor();
OAuth2AuthorizationProvider provider = new BasicOAuth2AuthorizationProvider(
URI.create("https://login.uber.com/oauth/v2/authorize"),
URI.create("https://login.uber.com/oauth/v2/token"),
new Duration(1,0,3600) /* default expiration time in case the server doesn't return any */);
OAuth2ClientCredentials credentials = new BasicOAuth2ClientCredentials(
getString(R.string.uberClientId), getString(R.string.uberSecret));
uberOAuthClient = new BasicOAuth2Client(
provider,
credentials,
new LazyUri(new Precoded("my redirect url")) /* Redirect URL */);
generateUberOAuthToken("my phone number", "my password");
}
public void generateUberOAuthToken(final String uName, final String password){
new Thread() {
public void run() {
try {
uberOAuthToken = new ResourceOwnerPasswordGrant(
uberOAuthClient, new BasicScope("profile"), uName, password).accessToken(executor);
}
catch (Exception e){
e.printStackTrace();
}
}
}.start();
}
The exception: org.dmfs.httpessentials.exceptions.UnauthorizedException: Authentication at 'https://login.uber.com/oauth/v2/token' failed. is always thrown. I've tried removing the redirect url so it should use the default from my dashboard, and I've tried added 1 and/or dashes to the phone number. The exception is always thrown when I request an access token. I know my account is setup correctly because this works fine in iOS. I feel like I must be missing something obvious. Anyone else run into this issue?

The token api did not recognize my phone number as a valid login parameter. It worked when I used my email instead.

Microsoft Azure Mobile authentication with Google provider SDK in Android

I am currently testing Microsoft Azure and the App Service/Mobile Apps feature using a native Android app and C# on the back end.
I started with the Getting Started application (ToDo) as the base app and now I am trying to enable Authentication using the https://azure.microsoft.com/en-us/documentation/articles/app-service-authentication-overview/ page and Google as the provider.
So far I have
created a Google project with a OAuth Web client
the authorized redirect uri set there is: https://.azurewebsites.net/.auth/login/google/callback
in the Azure portal and the App Service instance I have enabled Authorization/Authentication
the "Action to take when request is not authenticated" option is set to "Allow Request"
For the Google Provider I have set the Client Id and Client Secret
In the Android app I am using the GoogleApiClient class to let the user select a Google Account. Also I get the ID token and the Server Auth Code
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.requestIdToken(getString(R.string.server_client_id))
.requestServerAuthCode(getString(R.string.server_client_id))
.build();
mScopes = gso.getScopeArray();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this, this)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
Once the user picks up an account I retrieve the token and code and then I ask for an access token using the GoogleAuthUtil class. After I get the access_token I try to exchange it with an App Service token (authenticate2 method)
private void handleSignInResult(GoogleSignInResult result) {
Log.d("", "handleSignInResult: " + result.isSuccess());
if(result.isSuccess()) {
final GoogleSignInAccount account = result.getSignInAccount();
final String idToken = account.getIdToken();
String serverAuthCode = account.getServerAuthCode();
mSignInButton.setVisibility(View.GONE);
mGoogleUserText.setText(account.getDisplayName());
mGoogleUserText.setVisibility(View.VISIBLE);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
prefs.edit().putString("idToken", idToken).commit();
prefs.edit().putString("serverAuthCode", serverAuthCode).commit();
new AsyncTask<Void, Void, String>() {
#Override
protected String doInBackground(Void... params) {
try {
StringBuilder scopesBuilder = new StringBuilder("oauth2:");
for(Scope scope : mScopes) {
scopesBuilder//.append("https://www.googleapis.com/auth/")
.append(scope.toString())
.append(" ");
}
String token = GoogleAuthUtil.getToken(ToDoActivity.this,
account.getEmail(), scopesBuilder.toString());
return token;
} catch (IOException | GoogleAuthException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(ToDoActivity.this);
prefs.edit().putString("accessToken", result).apply();
authenticate2();
}
}.execute();
} else {
mSignInButton.setVisibility(View.VISIBLE);
mGoogleUserText.setVisibility(View.GONE);
}
}
private void authenticate2() {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String idToken = prefs.getString("idToken", null);
String serverAuthCode = prefs.getString("serverAuthCode", null);
String accessToken = prefs.getString("accessToken", null);
JsonObject json = new JsonObject();
json.addProperty("access_token", accessToken);
json.addProperty("id_token", idToken);
json.addProperty("authorization_code", serverAuthCode);
ListenableFuture<MobileServiceUser> loginFuture =
mClient.login(MobileServiceAuthenticationProvider.Google, json);
Futures.addCallback(loginFuture, new FutureCallback<MobileServiceUser>() {
#Override
public void onSuccess(MobileServiceUser result) {
createTable();
}
#Override
public void onFailure(Throwable t) {
Log.e(TAG, t.getMessage(), t);
}
});
}
So I am using the MobileServiceClient.login() method to send back to the server the access_token of the user in order to get back an Azure session.
Nevertheless, this call fails and I get back a MobileServiceException:
com.microsoft.windowsazure.mobileservices.MobileServiceException: You do not have permission to view this directory or page.
Any ideas what am I missing here?
Thanks

Well this is more than embarassing :-)
I first tried to "manually" verify the id_token using the Google tokeninfo endpoint:
https://www.googleapis.com/oauth2/v3/tokeninfo?id_token=
but I was getting a generic error that didn't give a lot of info.
Then I used the Google API Java client library and created a small test to verify my token (more info here: https://developers.google.com/identity/sign-in/android/backend-auth)
That test was failing as well and I realized that the reason for that was the expiring time of my token which was smaller than the current time. And this was happening because my emulator time was not correct!
When I set the "correct" timezone everything worked as expected.
Sorry for the post guys. You can use the code here as a template and don't forget to check your emulator time :-)

How can I get a Twitter public timeline with no user authentication using Twitter4j?

I've wrote some code to allow a user to login to his Twitter account and send Tweet using Twitter4j and following this tutorial.
Now I can also get the tweets of a public account using
ConfigurationBuilder cb = new ConfigurationBuilder();
cb.setHttpConnectionTimeout(10000)
.setHttpReadTimeout(10000)
.setOAuthConsumerKey(Config.TWITTER_CONSUMER_KEY)
.setOAuthConsumerSecret(Config.TWITTER_CONSUMER_SECRET)
.setOAuthAccessToken(Utils.getPrefsString(getActivity(),
TwitterPrefsFragment.PREF_KEY_OAUTH_TOKEN, "")) // empty if not authentified
.setOAuthAccessTokenSecret(Utils.getPrefsString(getActivity(),
TwitterPrefsFragment.PREF_KEY_OAUTH_SECRET, "")); // empty if not authentified
TwitterFactory tf = new TwitterFactory(cb.build());
Twitter twitter = tf.getInstance();
List<twitter4j.Status> statuses = twitter.getUserTimeline(SOME_PUBLIC_TWITTER_ACCOUNT, new Paging(1, 50));
but this only works when the user is authenticated and the app has the oauth token and secret in the preferences..
How can I get a Twitter public timeline with no Access Token, i.e. without having the user to authenticate?
EDIT
I'm reformulating my question to make it clearer:
I managed to authenticate my Twitter app and a user with the code given here.
Now, if the user is not logged in, how can I get a public timeline? In that case, there is no OAUTH_TOKEN and OAUTH_SECRET, and the request shown above does not work because an empty string is set to ConfigurationBuilder.setOAuthAccessToken and ConfigurationBuilder.setOAuthAccessTokenSecret.
So what is, if it exists, the request to get a public timeline, with no OAUTH_TOKEN and OAUTH_SECRET?

In your case, you should use Application-only authentication.
To do this with Twitter4J, try the following code
ConfigurationBuilder cb = new ConfigurationBuilder();
cb
.setOAuthConsumerKey(<YOUR_CONSUMER_KEY>)
.setOAuthConsumerSecret(<YOUR_CONSUMER_SECRET>)
.setApplicationOnlyAuthEnabled(true); // IMPORTANT: set T4J to use App-only auth
TwitterFactory tf = new TwitterFactory(cb.build());
Twitter twitter = tf.getInstance();
OAuth2Token token = twitter.getOAuth2Token();
if (token != null) {
System.out.println("Token Type : " + token.getTokenType());
System.out.println("Access Token: " + token.getAccessToken());
}
ResponseList<Status> list = twitter.getUserTimeline(783214); // Load #twitter's timeline without user login.
Key points of the above sample code:
Call setApplicationOnlyAuthEnabled(true) to enable Application-only authentication.
Get the access Token using getOAuth2Token() instead of getOAuthAccessToken()

This is certainly possible and I have already tried it. If your doubt is only regarding the Access Token and Access Token secret being empty, then you should try to use the Access Token provided in the app page. By app page I mean, the link where you have registered your twitter app.
If you go to dev.twitter.com ,and go to your app settings, you can see a consumer key, consumer secret, access token and access token secret. Make use of these and follow my below code and it should work,
ConfigurationBuilder cb = new ConfigurationBuilder();
cb.setDebugEnabled(true)
.setOAuthConsumerKey("B*************Q")
.setOAuthConsumerSecret(
"l*************o")
.setOAuthAccessToken(
"1*************s")
.setOAuthAccessTokenSecret(
"s*************s");
TwitterFactory tf = new TwitterFactory(cb.build());
twitter = tf.getInstance();
try {
List<Status> statuses;
String user;
user = "Replace this with the screen name whose feeds you want to fetch";
statuses = twitter.getUserTimeline(user);
Log.i("Status Count", statuses.size() + " Feeds");
} catch (TwitterException te) {
te.printStackTrace();
}
I used twitter 4j 3.03.jar for this.

How can I get a Twitter public timeline with no Access Token and Secret using Twitter4j?
Oh, that is very simple. YOU CAN'T.
Twitter a a data based company. 99% of the property of the company (I mean what the company owns) is data. It would be contra-productive, to give this data for free out to other people/businesses.
If the thing you want, would be possible, then there would be an easy way to backup the whole twitter database.
That is why they let you register an account for each application, that wants to use the API and limit each account to a certain amount of API calls per time frame. Of course they also want to prevent their network from spam etc.

If you want get tweets without user authenticating, you can use Application-only Authentication, because the user doesn´t need to login.
With Application-only authentication Twitter offers applications the ability to issue authenticated requests on behalf of the application itself (as opposed to on behalf of a specific user)
The application-only auth flow follows these steps:
An application encodes its consumer key and secret into a specially encoded set of credentials.
An application makes a request to the POST oauth2/token endpoint to exchange these credentials for a bearer token.
When accessing the REST API, the application uses the bearer token to authenticate.
NOTE: Because twitter4j has added this feature recently, you should use the last snapshot library.
An example using it:
private ConfigurationBuilder builder;
private Twitter twitter;
private TwitterFactory factory;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.init_act_layout);
// setup
builder = new ConfigurationBuilder();
builder.setUseSSL(true);
builder.setApplicationOnlyAuthEnabled(true);
builder.setOAuthConsumerKey(Constants.CONSUMER_KEY);
builder.setOAuthConsumerSecret(Constants.CONSUMER_SECRET);
Configuration configuration = builder.build();
factory = new TwitterFactory(configuration);
((MyApp) (MyApp.getApp())).setTFactory(factory);
if (isNeededTwitterAuth()) {
twitter = factory.getInstance();
//Get the token async and save it
}
//Search tweets
}
/*
* Checks if twitter access token is already saved in preferences
*
* #return true if auth needed
*/
private boolean isNeededTwitterAuth() {
SharedPreferences settings = getSharedPreferences(Constants.TWITTER_PREFERENCES, Context.MODE_PRIVATE);
String twitterAccesToken = settings.getString("bearerAccessToken", "");
String twitterTokenType = settings.getString("bearerTokenType", "");
return ((twitterAccesToken.length() == 0) && (twitterTokenType.length() == 0));
}
}
To get the bearer token, do it out of Main UI thread to avoid Network exception, f.i. using AsyncTask:
#Override
protected OAuth2Token doInBackground(Void... params) {
OAuth2Token bearerToken = null;
try {
bearerToken = twitter.getOAuth2Token();
} catch (TwitterException e) {
e.printStackTrace();
}
return bearerToken;
}
When you obtain the bearer token, save it:
SharedPreferences appSettings = getSharedPreferences(Constants.TWITTER_PREFERENCES, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = appSettings.edit();
prefEditor.putString("bearerAccessToken", result.getAccessToken());
prefEditor.putString("bearerTokenType", result.getTokenType());
prefEditor.commit();
And to use the bearer token:
OAuth2Token bearerToken = new OAuth2Token(bearerTokenType, bearerAccesstoken);
twitter.setOAuth2Token(bearerToken);
And search tweets (always out of Main thread):
#Override
protected QueryResult doInBackground(Void... params) {
twitter.setOAuth2Token(bearerToken);
Query query = new Query();
[...]
result = twitter.search(query);
A complete explanation in the blog (in Spanish...)
And a complete example in the twitter4j github
Hope it helps!

Android: Display public Twitter timeline using OAuth and Twitter4J

So I'm trying to get a list of status objects from a public Twitter timeline ( not my own Twitter timeline or anything that I have admin access to, just a public one from a local organization ) using the Twitter4J library in Android Studio, but I'm getting a little confused by the documentation. I'm running into this error: "Invalid access token format."
I did create a developers account with Twitter and got a consumer key and token, as well as an access token and secret numbers. Those values are saved in a set of private static strings for now. TWITTER_ZOO_ID is a private long with the Twitter ID number for the feed that I want to display. Here's the applicable code that I currently have:
Twitter twitter;
List<Status> statuses = null;
ConfigurationBuilder cb = new ConfigurationBuilder();
cb.setDebugEnabled(true)
.setOAuthConsumerKey( TWITTER_CONSUMER_KEY )
.setOAuthConsumerSecret( TWITTER_CONSUMER_SECRET )
.setOAuthAccessToken( TWITTER_AUTH_TOKEN )
.setOAuthAccessTokenSecret( TWITTER_AUTH_TOKEN_SECRET );
try {
TwitterFactory tf = new TwitterFactory(cb.build());
twitter = tf.getInstance();
twitter.setOAuthConsumer( TWITTER_CONSUMER_KEY, TWITTER_CONSUMER_SECRET );
statuses = twitter.getUserTimeline( TWITTER_ZOO_ID );
}
catch( TwitterException e ) {
Log.e( "TwitterListFragment", "Twitter Exception" );
return;
}
for( Status status : statuses )
mAdapter.add( status );
If anyone has a link to a good example for Twitter 1.1 using Twitter4J, or can provide an example of how to get those statuses, I'd really appreciate it. I'm currently using Android Studio and including Twitter4J in Gradle from MavenCentral.
Thank you!
EDIT:
Upon further reading, I've added this additional code without success:
twitter.setOAuthConsumer( TWITTER_CONSUMER_KEY, TWITTER_CONSUMER_SECRET );
AccessToken token = new AccessToken( TWITTER_AUTH_TOKEN, TWITTER_AUTH_TOKEN_SECRET );
twitter.setOAuthAccessToken( token );

If you want to get info from a public Twitter timeline, you can use Application-only Authentication, because the user doesn´t need to login, I think it fits you because you don´t use admin rights.
The application-only auth flow follows these steps:
An application encodes its consumer key and secret into a specially
encoded set of credentials.
An application makes a request to the POST
oauth2/token endpoint to exchange these credentials for a bearer token.
When accessing the REST API, the application uses the bearer token to authenticate.
Because twitter4j has added this feature recently, you should use the last snapshot library.
An example using it:
private ConfigurationBuilder builder;
private Twitter twitter;
private TwitterFactory factory;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.init_act_layout);
// setup
builder = new ConfigurationBuilder();
builder.setUseSSL(true);
builder.setApplicationOnlyAuthEnabled(true);
builder.setOAuthConsumerKey(Constants.CONSUMER_KEY);
builder.setOAuthConsumerSecret(Constants.CONSUMER_SECRET);
Configuration configuration = builder.build();
factory = new TwitterFactory(configuration);
((MyApp) (MyApp.getApp())).setTFactory(factory);
if (isNeededTwitterAuth()) {
twitter = factory.getInstance();
//Get the token async and save it
}
//Search tweets
}
/*
* Checks if twitter access token is already saved in preferences
*
* #return true if auth needed
*/
private boolean isNeededTwitterAuth() {
SharedPreferences settings = getSharedPreferences(Constants.TWITTER_PREFERENCES, Context.MODE_PRIVATE);
String twitterAccesToken = settings.getString("bearerAccessToken", "");
String twitterTokenType = settings.getString("bearerTokenType", "");
return ((twitterAccesToken.length() == 0) && (twitterTokenType.length() == 0));
}
}
To get the bearer token, do it out of Main UI thread to avoid Network exception, f.i. using AsyncTask:
#Override
protected OAuth2Token doInBackground(Void... params) {
OAuth2Token bearerToken = null;
try {
bearerToken = twitter.getOAuth2Token();
} catch (TwitterException e) {
e.printStackTrace();
}
return bearerToken;
}
When you obtain the bearer token, save it:
SharedPreferences appSettings = getSharedPreferences(Constants.TWITTER_PREFERENCES, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = appSettings.edit();
prefEditor.putString("bearerAccessToken", result.getAccessToken());
prefEditor.putString("bearerTokenType", result.getTokenType());
prefEditor.commit();
And to use the bearer token:
OAuth2Token bearerToken = new OAuth2Token(bearerTokenType, bearerAccesstoken);
twitter.setOAuth2Token(bearerToken);
And search tweets (always out of Main thread):
#Override
protected QueryResult doInBackground(Void... params) {
twitter.setOAuth2Token(bearerToken);
Query query = new Query();
[...]
result = twitter.search(query);
A complete explanation in the blog (in Spanish...)
And a complete example in the twitter4j github
Hope it helps!

I would recommend using the recently updated Twitter SDK (Fabric).
https://docs.fabric.io/android/twitter/twitter.html