Two-Factor Authentication with Authy, Java and Servlets

Download the Code

This Java Servlets sample application demonstrates two-factor authentication (2FA) using Authy. To run this sample app yourself, download the code and follow the instructions on GitHub.

Adding two-factor authentication (2FA) to your web application increases the security of your user's data. Multi-factor authentication determines the identity of a user by validating first by logging into the app, and then through their mobile devices using Authy.

For the second factor, we will validate that the user has their mobile phone by either:

  • Sending them a OneTouch push notification to their mobile Authy app or
  • Sending them a token through their mobile Authy app or
  • Sending them a one-time token in a text message sent with Authy via Twilio.
Loading Code Samples...
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package com.twilio.authy2fa;

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.AbstractHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class App extends AbstractHandler {

    public static void main(String[] args) throws Exception {
        Server server = new Server(8080);
        server.setHandler(new App());

        server.start();
        server.join();
    }

    public void handle(String target,
                       Request baseRequest,
                       HttpServletRequest request,
                       HttpServletResponse response)
            throws IOException, ServletException {
        response.setContentType("text/html;charset=utf-8");
        response.setStatus(HttpServletResponse.SC_OK);
        baseRequest.setHandled(true);
    }
}
Chat Application

Configure Authy

If you haven't already, now is the time to sign up for Authy. Create your first application, naming it as you wish. After you create your application, your production API key will be visible on your dashboard:

Authy Dashboard

Once we have an Authy API key, we store it on this .env file, which helps us set the environment variables for our app.

You'll also want to set a callback URL for your application in the OneTouch section of the Authy dashboard. See the project's README for more details.

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package com.twilio.authy2fa.servlet;

import com.authy.AuthyApiClient;
import com.twilio.authy2fa.lib.RequestParametersValidator;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;
import com.twilio.authy2fa.lib.SessionManager;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = "/registration")
public class RegistrationServlet extends HttpServlet{

    private final SessionManager sessionManager;
    private final UserService userService;
    private final AuthyApiClient authyClient;

    @SuppressWarnings("unused")
    public RegistrationServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new AuthyApiClient(System.getenv("AUTHY_API_KEY"))
        );
    }

    public RegistrationServlet(SessionManager sessionManager, UserService userService, AuthyApiClient authyClient) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.authyClient = authyClient;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.getRequestDispatcher("/registration.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String name = request.getParameter("name");
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        String countryCode = request.getParameter("countryCode");
        String phoneNumber = request.getParameter("phoneNumber");

        if (validateRequest(request)) {

            User user = userService.create(new User(name, email, password, countryCode, phoneNumber));

            com.authy.api.User authyUser = authyClient.getUsers().createUser(email, phoneNumber, countryCode);

            if (authyUser.isOk()) {
                user.setAuthyId(Integer.toString(authyUser.getId()));
                userService.update(user);
            }

            sessionManager.logIn(request, user.getId());
            response.sendRedirect("/account");
        } else {
            preserveStatusRequest(request, name, email, countryCode, phoneNumber);
            request.getRequestDispatcher("/registration.jsp").forward(request, response);
        }
    }

    private boolean validateRequest(HttpServletRequest request) {
        RequestParametersValidator validator = new RequestParametersValidator(request);

        return validator.validatePresence("name", "email", "password", "countryCode", "phoneNumber")
                && validator.validateEmail("email");
    }

    private void preserveStatusRequest(
            HttpServletRequest request,
            String name,
            String email,
            String countryCode,
            String phoneNumber) {
        request.setAttribute("name", name);
        request.setAttribute("email", email);
        request.setAttribute("countryCode", countryCode);
        request.setAttribute("phoneNumber", phoneNumber);
    }
}
src/main/java/com/twilio/authy2fa/servlet/RegistrationServlet.java
Configure Authy

src/main/java/com/twilio/authy2fa/servlet/RegistrationServlet.java

Let's take a look at how we register a user with Authy.

Register a User with Authy

When a new user signs up for our website, we call this controller, which handles saving our new user to the database as well as registering the user with Authy.

All Authy needs to get a user set up for your application is the email, phone number and country code. In order to do two-factor authentication, we need to make sure we ask for these things at the point of sign up.

Once we register the user with Authy we can get the user's authy_id back. This is very important since it's how we will verify the identity of our User with Authy.

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package com.twilio.authy2fa.servlet;

import com.authy.AuthyApiClient;
import com.twilio.authy2fa.lib.RequestParametersValidator;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;
import com.twilio.authy2fa.lib.SessionManager;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = "/registration")
public class RegistrationServlet extends HttpServlet{

    private final SessionManager sessionManager;
    private final UserService userService;
    private final AuthyApiClient authyClient;

    @SuppressWarnings("unused")
    public RegistrationServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new AuthyApiClient(System.getenv("AUTHY_API_KEY"))
        );
    }

    public RegistrationServlet(SessionManager sessionManager, UserService userService, AuthyApiClient authyClient) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.authyClient = authyClient;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.getRequestDispatcher("/registration.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String name = request.getParameter("name");
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        String countryCode = request.getParameter("countryCode");
        String phoneNumber = request.getParameter("phoneNumber");

        if (validateRequest(request)) {

            User user = userService.create(new User(name, email, password, countryCode, phoneNumber));

            com.authy.api.User authyUser = authyClient.getUsers().createUser(email, phoneNumber, countryCode);

            if (authyUser.isOk()) {
                user.setAuthyId(Integer.toString(authyUser.getId()));
                userService.update(user);
            }

            sessionManager.logIn(request, user.getId());
            response.sendRedirect("/account");
        } else {
            preserveStatusRequest(request, name, email, countryCode, phoneNumber);
            request.getRequestDispatcher("/registration.jsp").forward(request, response);
        }
    }

    private boolean validateRequest(HttpServletRequest request) {
        RequestParametersValidator validator = new RequestParametersValidator(request);

        return validator.validatePresence("name", "email", "password", "countryCode", "phoneNumber")
                && validator.validateEmail("email");
    }

    private void preserveStatusRequest(
            HttpServletRequest request,
            String name,
            String email,
            String countryCode,
            String phoneNumber) {
        request.setAttribute("name", name);
        request.setAttribute("email", email);
        request.setAttribute("countryCode", countryCode);
        request.setAttribute("phoneNumber", phoneNumber);
    }
}
src/main/java/com/twilio/authy2fa/servlet/RegistrationServlet.java
Register a User with Authy

src/main/java/com/twilio/authy2fa/servlet/RegistrationServlet.java

Having registered our user with Authy, we then can use Authy's OneTouch feature to log them in.

Log in with Authy OneTouch

When a User attempts to log in to our website, we will ask them for a second form of identification. Let's take a look at OneTouch verification first.

Authy OneTouch Approval

OneTouch works as follows:

  • We attempt to send a OneTouch Approval Request to the user.
  • If the user has OneTouch enabled, we will get a success message back.
  • The user hits Approve in their Authy app.
  • Authy makes a POST request to our app with an approved status.
  • We log the user in.
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package com.twilio.authy2fa.servlet.authentication;

import com.authy.onetouch.Client;
import com.authy.onetouch.approvalrequest.Parameters;
import com.authy.onetouch.approvalrequest.Result;
import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/login"})
public class LogInServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;
    private final Client client;

    @SuppressWarnings("unused")
    public LogInServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new Client(System.getenv("AUTHY_API_KEY"))
        );
    }

    public LogInServlet(SessionManager sessionManager, UserService userService, Client client) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.client = client;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        getServletContext().getRequestDispatcher("/login.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String email = request.getParameter("email");
        String password = request.getParameter("password");

        User user = userService.findByEmail(email);
        if (user != null && user.getPassword().equals(password)) {

            sessionManager.partialLogIn(request, user.getId());

            Result result = sendApprovalRequest(user);
            String verificationStrategy = result.isOk() ? "onetouch" : "sms";
            response.getOutputStream().write(verificationStrategy.getBytes());
        } else {
            response.getOutputStream().write("unauthorized".getBytes());
        }
    }

    private Result sendApprovalRequest(User user) throws IOException {
        Parameters parameters = Parameters.builder()
                .addDetail("email", user.getEmail())
                .build();

        return client.sendApprovalRequest(
                user.getAuthyId(), "Request login to Twilio demo app", parameters);
    }
}
src/main/java/com/twilio/authy2fa/servlet/authentication/LogInServlet.java
Implement One Touch Approval

src/main/java/com/twilio/authy2fa/servlet/authentication/LogInServlet.java

Now let's look at how to send a OneTouch request.

Send the OneTouch Request

When our user logs in, we let the user decide which two-factor authentication provider will be used. It can be Authy OneTouch, Authy SoftToken or an SMS token.

Authy OneTouch will be used when the user has a registered OneTouch device.

We create a wrapper for the OneTouch REST API, and we expose the method sendApprovalRequest to create an approval request. It takes the following 3 parameters:

  • The Authy user ID.
  • The message that will be displayed in the device.
  • A parameters object that contains the details specified on Create ApprovalRequest.

Here is an example about how to build the parameters object.

Parameters parameters = Parameters.builder()
  .addDetail("email", "alice@example.com")
  .addDetail("name", "Alice")
  .addHiddenDetail("phoneNumber", "555-5555")
  .build();
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package com.twilio.authy2fa.servlet.authentication;

import com.authy.onetouch.Client;
import com.authy.onetouch.approvalrequest.Parameters;
import com.authy.onetouch.approvalrequest.Result;
import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/login"})
public class LogInServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;
    private final Client client;

    @SuppressWarnings("unused")
    public LogInServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new Client(System.getenv("AUTHY_API_KEY"))
        );
    }

    public LogInServlet(SessionManager sessionManager, UserService userService, Client client) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.client = client;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        getServletContext().getRequestDispatcher("/login.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String email = request.getParameter("email");
        String password = request.getParameter("password");

        User user = userService.findByEmail(email);
        if (user != null && user.getPassword().equals(password)) {

            sessionManager.partialLogIn(request, user.getId());

            Result result = sendApprovalRequest(user);
            String verificationStrategy = result.isOk() ? "onetouch" : "sms";
            response.getOutputStream().write(verificationStrategy.getBytes());
        } else {
            response.getOutputStream().write("unauthorized".getBytes());
        }
    }

    private Result sendApprovalRequest(User user) throws IOException {
        Parameters parameters = Parameters.builder()
                .addDetail("email", user.getEmail())
                .build();

        return client.sendApprovalRequest(
                user.getAuthyId(), "Request login to Twilio demo app", parameters);
    }
}
src/main/java/com/twilio/authy2fa/servlet/authentication/LogInServlet.java
Send the OneTouch Request

src/main/java/com/twilio/authy2fa/servlet/authentication/LogInServlet.java

Once we send the request we need to update our user's AuthyStatus based on the response. But first we have to register a OneTouch callback endpoint.

Configuring the OneTouch callback

In order for our app to know what the user did after we sent the OneTouch request, we need to register a callback endpoint with Authy.

Authy OneTouch Callback

Note: In order to verify that the request is coming from Authy, we've written the helper method validate that will halt the request if it appears that it isn't coming from Authy.

Here in our callback, we look up the user using the Authy ID sent with the Authy POST request. Ideally at this point we would probably use a websocket to let our client know that we received a response from Authy. However for this version we're going to keep it simple and just update the AuthyStatus on the User. What our client-side code needs to do is to check for user.AuthyStatus == "approved" before logging him/her in.

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package com.twilio.authy2fa.servlet.authy;

import com.authy.onetouch.RequestValidator;
import com.authy.onetouch.requestvalidator.RequestValidationResult;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/authy/callback"})
public class CallbackServlet extends HttpServlet {

    private final UserService userService;

    @SuppressWarnings("unused")
    public CallbackServlet() {
        this(new UserService());
    }

    public CallbackServlet(UserService userService) {
        this.userService = userService;
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        RequestValidator validator = new RequestValidator(System.getenv("AUTHY_API_KEY"), request);
        RequestValidationResult validationResult = validator.validate();

        if (validationResult.isValid()) {

            // Handle approved, denied, unauthorized
            User user = userService.findByAuthyId(validationResult.getAuthyId());
            user.setAuthyStatus(validationResult.getStatus());

            userService.update(user);
        }
    }
}
src/main/java/com/twilio/authy2fa/servlet/authy/CallbackServlet.java
Configure OneTouch Callback to validate request

src/main/java/com/twilio/authy2fa/servlet/authy/CallbackServlet.java

Our application is now capable of using Authy for two-factor authentication. However, we are still missing an important part: the client-side code that will handle it.

Handle Two-Factor in the Browser

We've already taken a look at what's happening on the server side, so let's step in front of the cameras and see how our JavaScript is interacting with those server endpoints.

When we expect a OneTouch response, we will begin polling /authy/status until we see Authy status is not empty.

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$(document).ready(function() {
    $("#login-form").submit(function(event) {
        event.preventDefault();

        var data = $(event.currentTarget).serialize();
        authyVerification(data);
    });

    var authyVerification = function (data) {
        $.post("/login", data, function (result) {
            resultActions[result]();
        });
    };

    var resultActions = {
        onetouch: function() {
            $("#authy-modal").modal({ backdrop: "static" }, "show");
            $(".auth-token").hide();
            $(".auth-onetouch").fadeIn();
            monitorOneTouchStatus();
        },

        sms: function () {
            $("#authy-modal").modal({ backdrop: "static" }, "show");
            $(".auth-onetouch").hide();
            $(".auth-token").fadeIn();
            requestAuthyToken();
        },

        unauthorized: function () {
            $("#error-message").text("Invalid credentials");
        }
    };

    var monitorOneTouchStatus = function () {
        $.post("/authy/status")
            .done(function (data) {
                if (data === "") {
                    setTimeout(monitorOneTouchStatus, 2000);
                } else {
                    $("#confirm-login").submit();
                }
            });
    }

    var requestAuthyToken = function () {
        $.post("/authy/request-token")
            .done(function (data) {
                $("#authy-token-label").text(data);
            });
    }

    $("#logout").click(function() {
        $("#logout-form").submit();
    });
});
src/main/webapp/javascript/application.js
Poll the server until we see the result of the Authy OneTouch login

src/main/webapp/javascript/application.js

Let's take a closer look at how we check the login status on the server.

Check Login Status

This is the endpoint that our JavaScript is polling. It is waiting for the user Authy status.

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package com.twilio.authy2fa.servlet.authy;

import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/authy/status"})
public class OneTouchStatusServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;

    @SuppressWarnings("unused")
    public OneTouchStatusServlet() {
        this(new SessionManager(), new UserService());
    }

    public OneTouchStatusServlet(SessionManager sessionManager, UserService userService) {
        this.sessionManager = sessionManager;
        this.userService = userService;
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        long userId = sessionManager.getLoggedUserId(request);
        User user = userService.find(userId);

        response.getOutputStream().write(user.getAuthyStatus().getBytes());
    }
}
src/main/java/com/twilio/authy2fa/servlet/authy/OneTouchStatusServlet.java
Check Login Status

src/main/java/com/twilio/authy2fa/servlet/authy/OneTouchStatusServlet.java

Finally, we can confirm the login.

Finish the 2FA Step

If the AuthyStatus is approved, the user will be redirected to the account page, otherwise we'll show the login form with a message that indicates the if the request was denied or unauthorized.

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package com.twilio.authy2fa.servlet.authentication;

import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/confirm-login"})
public class ConfirmLogInServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;

    @SuppressWarnings("unused")
    public ConfirmLogInServlet() {
        this(new SessionManager(), new UserService());
    }

    public ConfirmLogInServlet(SessionManager sessionManager, UserService userService) {
        this.sessionManager = sessionManager;
        this.userService = userService;
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        long userId = sessionManager.getLoggedUserId(request);
        User user = userService.find(userId);

        String authyStatus = user.getAuthyStatus();

        // Reset the Authy status
        user.setAuthyStatus("");
        userService.update(user);

        switch (authyStatus) {
            case "approved":
                sessionManager.logIn(request, user.getId());
                response.sendRedirect("/account");
                break;
            case "denied":
                sessionManager.logOut(request);
                request.setAttribute("data", "You have declined the request");
                request.getRequestDispatcher("/login.jsp").forward(request, response);
                break;
            default:
                sessionManager.logOut(request);
                request.setAttribute("data", "Unauthorized access");
                request.getRequestDispatcher("/login.jsp").forward(request, response);
                break;
        }
    }
}
src/main/java/com/twilio/authy2fa/servlet/authentication/ConfirmLogInServlet.java
Redirect user to the right page based based on authentication status

src/main/java/com/twilio/authy2fa/servlet/authentication/ConfirmLogInServlet.java

That's it! We've just implemented two-factor auth using three different methods and the latest in Authy technology.

Where to Next?

If you're a Java developer working with Twilio, you might enjoy these other tutorials:

SMS and MMS Notifications

Faster than e-mail and less likely to get blocked, text messages are great for timely alerts and notifications. Learn how to send out SMS (and MMS) notifications to a list of server administrators.

Click-To-Call

Click-to-call enables your company to convert web traffic into phone calls with the click of a button

Did this help?

Thanks for checking out this tutorial! If you have any feedback to share with us, we'd love to hear it. Connect with us on Twitter and let us know what you build!

David Prothero
Andrew Baker
Agustin Camino

Need some help?

We all do sometimes; code is hard. Get help now from our support team, or lean on the wisdom of the crowd browsing the Twilio tag on Stack Overflow.

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Loading Code Samples...
package com.twilio.authy2fa;

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.AbstractHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class App extends AbstractHandler {

    public static void main(String[] args) throws Exception {
        Server server = new Server(8080);
        server.setHandler(new App());

        server.start();
        server.join();
    }

    public void handle(String target,
                       Request baseRequest,
                       HttpServletRequest request,
                       HttpServletResponse response)
            throws IOException, ServletException {
        response.setContentType("text/html;charset=utf-8");
        response.setStatus(HttpServletResponse.SC_OK);
        baseRequest.setHandled(true);
    }
}
package com.twilio.authy2fa.servlet;

import com.authy.AuthyApiClient;
import com.twilio.authy2fa.lib.RequestParametersValidator;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;
import com.twilio.authy2fa.lib.SessionManager;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = "/registration")
public class RegistrationServlet extends HttpServlet{

    private final SessionManager sessionManager;
    private final UserService userService;
    private final AuthyApiClient authyClient;

    @SuppressWarnings("unused")
    public RegistrationServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new AuthyApiClient(System.getenv("AUTHY_API_KEY"))
        );
    }

    public RegistrationServlet(SessionManager sessionManager, UserService userService, AuthyApiClient authyClient) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.authyClient = authyClient;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.getRequestDispatcher("/registration.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String name = request.getParameter("name");
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        String countryCode = request.getParameter("countryCode");
        String phoneNumber = request.getParameter("phoneNumber");

        if (validateRequest(request)) {

            User user = userService.create(new User(name, email, password, countryCode, phoneNumber));

            com.authy.api.User authyUser = authyClient.getUsers().createUser(email, phoneNumber, countryCode);

            if (authyUser.isOk()) {
                user.setAuthyId(Integer.toString(authyUser.getId()));
                userService.update(user);
            }

            sessionManager.logIn(request, user.getId());
            response.sendRedirect("/account");
        } else {
            preserveStatusRequest(request, name, email, countryCode, phoneNumber);
            request.getRequestDispatcher("/registration.jsp").forward(request, response);
        }
    }

    private boolean validateRequest(HttpServletRequest request) {
        RequestParametersValidator validator = new RequestParametersValidator(request);

        return validator.validatePresence("name", "email", "password", "countryCode", "phoneNumber")
                && validator.validateEmail("email");
    }

    private void preserveStatusRequest(
            HttpServletRequest request,
            String name,
            String email,
            String countryCode,
            String phoneNumber) {
        request.setAttribute("name", name);
        request.setAttribute("email", email);
        request.setAttribute("countryCode", countryCode);
        request.setAttribute("phoneNumber", phoneNumber);
    }
}
package com.twilio.authy2fa.servlet;

import com.authy.AuthyApiClient;
import com.twilio.authy2fa.lib.RequestParametersValidator;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;
import com.twilio.authy2fa.lib.SessionManager;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = "/registration")
public class RegistrationServlet extends HttpServlet{

    private final SessionManager sessionManager;
    private final UserService userService;
    private final AuthyApiClient authyClient;

    @SuppressWarnings("unused")
    public RegistrationServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new AuthyApiClient(System.getenv("AUTHY_API_KEY"))
        );
    }

    public RegistrationServlet(SessionManager sessionManager, UserService userService, AuthyApiClient authyClient) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.authyClient = authyClient;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.getRequestDispatcher("/registration.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String name = request.getParameter("name");
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        String countryCode = request.getParameter("countryCode");
        String phoneNumber = request.getParameter("phoneNumber");

        if (validateRequest(request)) {

            User user = userService.create(new User(name, email, password, countryCode, phoneNumber));

            com.authy.api.User authyUser = authyClient.getUsers().createUser(email, phoneNumber, countryCode);

            if (authyUser.isOk()) {
                user.setAuthyId(Integer.toString(authyUser.getId()));
                userService.update(user);
            }

            sessionManager.logIn(request, user.getId());
            response.sendRedirect("/account");
        } else {
            preserveStatusRequest(request, name, email, countryCode, phoneNumber);
            request.getRequestDispatcher("/registration.jsp").forward(request, response);
        }
    }

    private boolean validateRequest(HttpServletRequest request) {
        RequestParametersValidator validator = new RequestParametersValidator(request);

        return validator.validatePresence("name", "email", "password", "countryCode", "phoneNumber")
                && validator.validateEmail("email");
    }

    private void preserveStatusRequest(
            HttpServletRequest request,
            String name,
            String email,
            String countryCode,
            String phoneNumber) {
        request.setAttribute("name", name);
        request.setAttribute("email", email);
        request.setAttribute("countryCode", countryCode);
        request.setAttribute("phoneNumber", phoneNumber);
    }
}
package com.twilio.authy2fa.servlet.authentication;

import com.authy.onetouch.Client;
import com.authy.onetouch.approvalrequest.Parameters;
import com.authy.onetouch.approvalrequest.Result;
import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/login"})
public class LogInServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;
    private final Client client;

    @SuppressWarnings("unused")
    public LogInServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new Client(System.getenv("AUTHY_API_KEY"))
        );
    }

    public LogInServlet(SessionManager sessionManager, UserService userService, Client client) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.client = client;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        getServletContext().getRequestDispatcher("/login.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String email = request.getParameter("email");
        String password = request.getParameter("password");

        User user = userService.findByEmail(email);
        if (user != null && user.getPassword().equals(password)) {

            sessionManager.partialLogIn(request, user.getId());

            Result result = sendApprovalRequest(user);
            String verificationStrategy = result.isOk() ? "onetouch" : "sms";
            response.getOutputStream().write(verificationStrategy.getBytes());
        } else {
            response.getOutputStream().write("unauthorized".getBytes());
        }
    }

    private Result sendApprovalRequest(User user) throws IOException {
        Parameters parameters = Parameters.builder()
                .addDetail("email", user.getEmail())
                .build();

        return client.sendApprovalRequest(
                user.getAuthyId(), "Request login to Twilio demo app", parameters);
    }
}
package com.twilio.authy2fa.servlet.authentication;

import com.authy.onetouch.Client;
import com.authy.onetouch.approvalrequest.Parameters;
import com.authy.onetouch.approvalrequest.Result;
import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/login"})
public class LogInServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;
    private final Client client;

    @SuppressWarnings("unused")
    public LogInServlet() {
        this(
                new SessionManager(),
                new UserService(),
                new Client(System.getenv("AUTHY_API_KEY"))
        );
    }

    public LogInServlet(SessionManager sessionManager, UserService userService, Client client) {
        this.sessionManager = sessionManager;
        this.userService = userService;
        this.client = client;
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        getServletContext().getRequestDispatcher("/login.jsp").forward(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String email = request.getParameter("email");
        String password = request.getParameter("password");

        User user = userService.findByEmail(email);
        if (user != null && user.getPassword().equals(password)) {

            sessionManager.partialLogIn(request, user.getId());

            Result result = sendApprovalRequest(user);
            String verificationStrategy = result.isOk() ? "onetouch" : "sms";
            response.getOutputStream().write(verificationStrategy.getBytes());
        } else {
            response.getOutputStream().write("unauthorized".getBytes());
        }
    }

    private Result sendApprovalRequest(User user) throws IOException {
        Parameters parameters = Parameters.builder()
                .addDetail("email", user.getEmail())
                .build();

        return client.sendApprovalRequest(
                user.getAuthyId(), "Request login to Twilio demo app", parameters);
    }
}
package com.twilio.authy2fa.servlet.authy;

import com.authy.onetouch.RequestValidator;
import com.authy.onetouch.requestvalidator.RequestValidationResult;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/authy/callback"})
public class CallbackServlet extends HttpServlet {

    private final UserService userService;

    @SuppressWarnings("unused")
    public CallbackServlet() {
        this(new UserService());
    }

    public CallbackServlet(UserService userService) {
        this.userService = userService;
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        RequestValidator validator = new RequestValidator(System.getenv("AUTHY_API_KEY"), request);
        RequestValidationResult validationResult = validator.validate();

        if (validationResult.isValid()) {

            // Handle approved, denied, unauthorized
            User user = userService.findByAuthyId(validationResult.getAuthyId());
            user.setAuthyStatus(validationResult.getStatus());

            userService.update(user);
        }
    }
}
$(document).ready(function() {
    $("#login-form").submit(function(event) {
        event.preventDefault();

        var data = $(event.currentTarget).serialize();
        authyVerification(data);
    });

    var authyVerification = function (data) {
        $.post("/login", data, function (result) {
            resultActions[result]();
        });
    };

    var resultActions = {
        onetouch: function() {
            $("#authy-modal").modal({ backdrop: "static" }, "show");
            $(".auth-token").hide();
            $(".auth-onetouch").fadeIn();
            monitorOneTouchStatus();
        },

        sms: function () {
            $("#authy-modal").modal({ backdrop: "static" }, "show");
            $(".auth-onetouch").hide();
            $(".auth-token").fadeIn();
            requestAuthyToken();
        },

        unauthorized: function () {
            $("#error-message").text("Invalid credentials");
        }
    };

    var monitorOneTouchStatus = function () {
        $.post("/authy/status")
            .done(function (data) {
                if (data === "") {
                    setTimeout(monitorOneTouchStatus, 2000);
                } else {
                    $("#confirm-login").submit();
                }
            });
    }

    var requestAuthyToken = function () {
        $.post("/authy/request-token")
            .done(function (data) {
                $("#authy-token-label").text(data);
            });
    }

    $("#logout").click(function() {
        $("#logout-form").submit();
    });
});
package com.twilio.authy2fa.servlet.authy;

import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/authy/status"})
public class OneTouchStatusServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;

    @SuppressWarnings("unused")
    public OneTouchStatusServlet() {
        this(new SessionManager(), new UserService());
    }

    public OneTouchStatusServlet(SessionManager sessionManager, UserService userService) {
        this.sessionManager = sessionManager;
        this.userService = userService;
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        long userId = sessionManager.getLoggedUserId(request);
        User user = userService.find(userId);

        response.getOutputStream().write(user.getAuthyStatus().getBytes());
    }
}
package com.twilio.authy2fa.servlet.authentication;

import com.twilio.authy2fa.lib.SessionManager;
import com.twilio.authy2fa.models.User;
import com.twilio.authy2fa.models.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = {"/confirm-login"})
public class ConfirmLogInServlet extends HttpServlet {

    private final SessionManager sessionManager;
    private final UserService userService;

    @SuppressWarnings("unused")
    public ConfirmLogInServlet() {
        this(new SessionManager(), new UserService());
    }

    public ConfirmLogInServlet(SessionManager sessionManager, UserService userService) {
        this.sessionManager = sessionManager;
        this.userService = userService;
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        long userId = sessionManager.getLoggedUserId(request);
        User user = userService.find(userId);

        String authyStatus = user.getAuthyStatus();

        // Reset the Authy status
        user.setAuthyStatus("");
        userService.update(user);

        switch (authyStatus) {
            case "approved":
                sessionManager.logIn(request, user.getId());
                response.sendRedirect("/account");
                break;
            case "denied":
                sessionManager.logOut(request);
                request.setAttribute("data", "You have declined the request");
                request.getRequestDispatcher("/login.jsp").forward(request, response);
                break;
            default:
                sessionManager.logOut(request);
                request.setAttribute("data", "Unauthorized access");
                request.getRequestDispatcher("/login.jsp").forward(request, response);
                break;
        }
    }
}