Implementing Change Password Feature in SUSI Android App using Custom Dialogs

Recently a new servlet was implemented on the SUSI Server about changing the password of the logged in user. This feature comes in handy to avoid unauthorized usage of the SUSI Account. Almost all the online platforms have this feature to change the password to avoid notorious user to unethical use someone else’s account. In SUSI Android app this new API was used with a nice UI to change the password of the user. The process is very simple and easy to grasp. This blog will try to cover the API information and implementation of the Change Password feature in the android client.

API Information

For changing the password of SUSI Account of the user, we have to call on  /aaa/changepassword.json

We have to provide three parameters along with this api call:

  1. changepassword:  Email of user (type string) using which user is logged in.
  2. password:  Old password (type string with min length of 6) of the user.
  3. newpassword: New password (type string with min length of 6) of the user.
  4. access_token: An encrypted access_token indicating user is logged in.

Sample Response (Success)

  "session": {"identity": {
    "type": "email",
    "name": "YOUR_EMAIL_ADDRESS",
    "anonymous": false
  "accepted": true,
  "message": "Your password has been changed!"

Error Response (Failure). This happens when user is not logged in:

Problem accessing /aaa/changepassword.json. Reason:
   Base user role not sufficient. Your base user role is 'ANONYMOUS', your user role is 'anonymous'

Implementation in SUSI Android App

The change password option is located in Settings Activity and displayed only when user is logged in. So, if a logged in user wants to change the password of his/her SUSI AI account, he/she can simply go to the Settings and click on the option. Clicking on the options open up a dialog box with 3 input layouts for:

  1. Current Password
  2. New Password
  3. Confirm New Password

So, user can simply add these three inputs and click “Ok”. This will change the password of their account. Let’s see some code explanation.

  1. When user clicks on the “reset password” option from the settings, the showResetPasswordAlert() method is called which displays the dialog. And when user clicks on the “OK” button the resetPassword method() in the presenter is called passing input from the three input layout as parameters.

settingsPresenter.resetPassword(password.editText?.text.toString(), newPassword.editText?.text.toString(), conPassword.editText?.text.toString())

fun showResetPasswordAlert() {
   val builder = AlertDialog.Builder(activity)
   val resetPasswordView = activity.layoutInflater.inflate(R.layout.alert_reset_password, null)
   password = resetPasswordView.findViewById( as TextInputLayout
   newPassword = resetPasswordView.findViewById( as TextInputLayout
   conPassword = resetPasswordView.findViewById( as TextInputLayout
           .setNegativeButton(Constant.CANCEL, null)
           .setPositiveButton(getString(R.string.ok), null)
   resetPasswordAlert = builder.create()
   resetPasswordAlert.getButton(AlertDialog.BUTTON_POSITIVE)?.setOnClickListener {
       settingsPresenter.resetPassword(password.editText?.text.toString(), newPassword.editText?.text.toString(), conPassword.editText?.text.toString())
  1. In the resetPassword method, all details about the passwords are checked like:
  1. If passwords are not empty.
  2. If passwords’ lengths are greater than 6.
  3. If new password and confirmation new password matches


When all the conditions are satisfied and all the inputs are valid, resetPassword() in model is called which makes network call to change password of the user.


override fun resetPassword(password: String, newPassword: String, conPassword: String) {
   if (password.isEmpty()) {
       settingView?.invalidCredentials(true, Constant.PASSWORD)
   if (newPassword.isEmpty()) {
       settingView?.invalidCredentials(true, Constant.NEW_PASSWORD)
   if (conPassword.isEmpty()) {
       settingView?.invalidCredentials(true, Constant.CONFIRM_PASSWORD)

   if (!CredentialHelper.isPasswordValid(newPassword)) {

   if (newPassword != conPassword) {
       settingView?.invalidCredentials(false, Constant.NEW_PASSWORD)


So, this blog talked about how the Change Password feature is implemented in SUSI Android App. This included how a network call is made, logic for making network, information about API, making dialogs with custom UI, etc. So, If you are looking forward to contribute to SUSI Android App, this can help you a little. But if not so, this may also help you in understanding and how you can implement a dialog box with custom UI.


  1. To know about servlets
  2. To see how to implement one
  3. To see how to make network calls in android using Retrofit
  4. Official docs for displaying dialog
  5. Implementing dialog boxes with custom UI
  6. Pull Request for API reference:
Continue ReadingImplementing Change Password Feature in SUSI Android App using Custom Dialogs

Change Password for SUSI Accounts Using Access Token and Email-ID

In this blog, I discuss how the SUSI server synchronizes with SUSI Accounts and SUSI webchat for users to Change Password. When a user logs in, the clients store the email id of the user along with the access token in cookies. These are stored once the client gets a positive login response from the server. Both of these are required at the time of making the final call. Web clients store the email id and access token in the following way.

cookies.set('loggedIn', loggedIn, { path: '/', maxAge: time });
cookies.set('emailId', email, { path: '/', maxAge: time });

First, the client has to ask the user to enter their current password. A javascript test is used to validate that at least 6 characters must be entered by the user. A similar test is run on the new password. But while confirming the password, client checks whether the user has entered the same password as new password or not. These are just the basics. In next stage (which is achieved only when all the above conditions are met), client encodes the email id (which it gets from cookies), current password, new password and the access token (which it again extracts from cookies).

Now, Client just has to make an ajax request to the server. The response is processed and sent back to the client. Let us now look at PasswordChange Servlet.

The base user role is defined as USER. Initial steps of the servlet are to extract the values form the request it receives. The values extracted from the request are in turn used to make a client’s identity. Before that, server checks if current and new password have same values or not. If not, then server returns a JSON response to user stating, “Your current password and new password matches”. Otherwise, it will continue its control flow as it is. Look at the code snippet below:

            result.put("message", "Your current password and new password matches");
            result.put("accepted", false);
            return new ServiceResponse(result);

The reader here may think that they have discovered a hack. But they have not. Why? Because this is just the first step. In later stages, the hash of passwords are used to match to see whether the passwords match or not. To obtain a proper client identity, first a Client credentials object is made with support from the email id which is received in ‘changepassword’ attribute. Using the ClientCredentials object made above, an object of Authentication class is made. This object uses a method defined in its class to return a valid client identity. Using the client identity, value of password hash is extracted from the database along with the salt used to hash the password. If any error is encountered while extracting the client’s password hash value and/or salt value, an error is thrown towards the client, with a message stating “invalid credentials”.

ClientCredential pwcredential = new ClientCredential(ClientCredential.Type.passwd_login, useremail);
            Authentication authentication = DAO.getAuthentication(pwcredential);
            ClientCredential emailcred = new ClientCredential(ClientCredential.Type.passwd_login,
            ClientIdentity identity = authentication.getIdentity();
            String passwordHash;
            String salt;

            try {
                passwordHash = authentication.getString("passwordHash");
                salt = authentication.getString("salt");
            } catch (Throwable e) {
                Log.getLog().info("Invalid password try for user: " + identity.getName() + " from host: " + post.getClientHost() + " : password or salt missing in database");
                result.put("message", "invalid credentials");
                throw new APIException(422, "Invalid credentials");

Using the same salt value that was used earlier, a hash for password entered by the user will be generated which now matches  the previous value. This is the point where the hack you were thinking you found, failed. Again the server throws an error message if user’s credential did not match. Passwords are hard to handle and easy to guess. So here we have used quite many tests before changing them. Users are not allowed to use their email id as a password as well.

If the server is clear on all the above facts and tests, It finally generates a new hashed value of the password received in the parameter ‘newpassword’ and replaces the old hash value with the new one. To notify the clients that password change exited with a success response, it sends a JSON object with message “Your password has been changed!” and accepted flag set to true.

if (DAO.hasAuthentication(emailcred)) {
                    Authentication emailauth = DAO.getAuthentication(emailcred);
                    String newsalt = createRandomString(20);
                    emailauth.put("passwordHash", getHash(newpassword, salt));
                    Log.getLog().info("password change for user: " + identity.getName() + " via newpassword from host: " + post.getClientHost());
                    result.put("message", "Your password has been changed!");
                    result.put("accepted", true);


Additional Resources:

Wikipedia article: What is DAO?

Continue ReadingChange Password for SUSI Accounts Using Access Token and Email-ID