Okhttp refresh expired token when multiple requests are sent to the server

Question

I have a ViewPager and three webservice calls are made when ViewPager is loaded simultaneously.

When first one returns 401, Authenticato

Answer 1

I found the solution with authenticator, the id is the number of the request, only for identification. Comments are in Spanish

 private final static Lock locks = new ReentrantLock();

httpClient.authenticator(new Authenticator() {
            @Override
            public Request authenticate(@NonNull Route route,@NonNull Response response) throws IOException {

                Log.e("Error" , "Se encontro un 401 no autorizado y soy el numero : " + id);

                //Obteniendo token de DB
                SharedPreferences prefs = mContext.getSharedPreferences(
                        BuildConfig.APPLICATION_ID, Context.MODE_PRIVATE);

                String token_db = prefs.getString("refresh_token","");

                //Comparando tokens
                if(mToken.getRefreshToken().equals(token_db)){

                    locks.lock(); 

                    try{
                        //Obteniendo token de DB
                         prefs = mContext.getSharedPreferences(
                                BuildConfig.APPLICATION_ID, Context.MODE_PRIVATE);

                        String token_db2 = prefs.getString("refresh_token","");
                        //Comparando tokens
                        if(mToken.getRefreshToken().equals(token_db2)){

                            //Refresh token
                            APIClient tokenClient = createService(APIClient.class);
                            Call call = tokenClient.getRefreshAccessToken(API_OAUTH_CLIENTID,API_OAUTH_CLIENTSECRET, "refresh_token", mToken.getRefreshToken());
                            retrofit2.Response res = call.execute();
                            AccessToken newToken = res.body();
                            // do we have an access token to refresh?
                            if(newToken!=null && res.isSuccessful()){
                                String refreshToken = newToken.getRefreshToken();

                                    Log.e("Entra", "Token actualizado y soy el numero :  " + id + " : " + refreshToken);

                                    prefs = mContext.getSharedPreferences(BuildConfig.APPLICATION_ID, Context.MODE_PRIVATE);
                                    prefs.edit().putBoolean("log_in", true).apply();
                                    prefs.edit().putString("access_token", newToken.getAccessToken()).apply();
                                    prefs.edit().putString("refresh_token", refreshToken).apply();
                                    prefs.edit().putString("token_type", newToken.getTokenType()).apply();

                                    locks.unlock();

                                    return response.request().newBuilder()
                                            .header("Authorization", newToken.getTokenType() + " " + newToken.getAccessToken())
                                            .build();

                             }else{
                                //Dirigir a login
                                Log.e("redirigir", "DIRIGIENDO LOGOUT");

                                locks.unlock();
                                return null;
                            }

                        }else{
                            //Ya se actualizo tokens

                            Log.e("Entra", "El token se actualizo anteriormente, y soy el no : " + id );

                            prefs = mContext.getSharedPreferences(BuildConfig.APPLICATION_ID, Context.MODE_PRIVATE);

                            String type = prefs.getString("token_type","");
                            String access = prefs.getString("access_token","");

                            locks.unlock();

                            return response.request().newBuilder()
                                    .header("Authorization", type + " " + access)
                                    .build();
                        }

                    }catch (Exception e){
                        locks.unlock();
                        e.printStackTrace();
                        return null;
                    }


                }
                return null;
            }
        });