Earlier our client side apps used Google Sign-In.
Now we are moving to custom auth, as we plan on having the user's phone number as the only identity (instead of a Google Account). But after implementing the custom Authenticator, the client IDs are not being checked and I am able to make API calls from anywhere.
When only Google Sign-in was being used at the client side, the client ID was being validated and I was not able to make API calls from any clients other than the ones authorized.
How do I verify the Client IDs while using custom authenticator?
Code for the Api Endpoint
@Api(name = "apiSubscriber",
clientIds = {
Constants.webClientId,
Constants.androidClientId,
Constants.iOSClientId
},
authenticators = {com.google.api.server.spi.auth.EndpointsAuthenticator.class,
CustomAuth.class},
audiences = {Constants.androidAudience},
)
public class ApiSubscriber {
@ApiMethod
public Subscriber getSubscriberData(User user){
if(user!=null){
//fetches subscriber data
}
}
//... Other ApiMethods
}
Code for Custom Authenticator
public class CustomAuth implements Authenticator {
@Override
public User authenticate(HttpServletRequest request) {
String phoneNumber = request.getHeader("phoneNumber");
String token = request.getHeader("Authorization");
if(checkToken(phoneNumber,token)){
return new User(phoneNumber);
}
return null;
}
private boolean checkToken(String phoneNumber, String token){
//Checks if authorization token is valid
}
}
