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Figure 103 A simple password change form requires hashes and encryption to safely send the new password from the client to the server
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The Display interface is similar to the Login interface and has a setter for the name field, a couple of getters for the password fields, a method for enabling or disabling the Change Password button, a callback for handling the blur events on both password fields, and a callback for the click event of the button The corresponding View code is simple, so let s move to the Presenter We don t want the user to attempt changing his password, unless he has entered it twice, and both data entries match We can use a common blur handler for both password fields
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package comfkerekimvpprojectclientchangePassword; // imports public class ChangePasswordFormPresenter extends Presenter<ChangePasswordFormDisplay> { public static String PLACE = "change"; LoginServiceAsync loginService; SimpleCallback<String> loginSuccessCallback; public ChangePasswordFormPresenter( final String params, final ChangePasswordFormDisplay loginDisplay, final Environment environment) { super(params, loginDisplay, environment); loginService = getEnvironment()getModel()getRemoteLoginService(); final SimpleCallback<Object> commonBlurHandler = new SimpleCallback<Object>() { @Override public void goBack(final Object result) { final String pass1 = ChangePasswordFormPresenterthis getDisplay()getPassword1();
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final String pass2 = ChangePasswordFormPresenterthis getDisplay()getPassword2(); final boolean canLogin = !pass1isEmpty() & pass1equals(pass2); ChangePasswordFormPresenterthisgetDisplay() enableChangePasswordButton(canLogin); } }; loginDisplaysetPasswordBlurCallback(commonBlurHandler); commonBlurHandlergoBack(null);
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Initializing the form is quite straightforward Notice we require some new methods in the Environment object: We ll store in it the current user (whose name we show in a read-only field), the current password (which the user entered in the login form), and the current session key (which was obtained when the user logged in)
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final String currentUser = environmentgetCurrentUserName(); final String currentKey = environmentgetCurrentSessionKey(); final String currentPass = environmentgetCurrentUserPassword(); loginDisplaysetName(currentUser);
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The only part missing from the code is the click handler for the Change Login button We get the new password from the form, generate a nonce, and use it plus the user (current) password and the session key to encrypt the new password Adding a hash (to avoid data tampering), we call the changePassword() method If the password change is successful, we have to change the password in the environment; otherwise, the server (which already has the new password) wouldn t decrypt future encrypted data
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loginDisplay setChangePasswordCallback(new SimpleCallback<Object>() { @Override public void goBack(final Object result) { ChangePasswordFormPresenterthisgetDisplay() enableChangePasswordButton(false); final String pass1 = ChangePasswordFormPresenterthis getDisplay()getPassword1(); final Security sc = new Security(); final String nonce = SecurityrandomCharString(); final String encryptedPass1 = sccodeDecode(nonce + currentPass + currentKey, pass1); final String visibleEncryptedPass1 = Security byteStringToHexString(encryptedPass1);
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final String hashPassword = Securitymd5(nonce + visibleEncryptedPass1 + environmentgetCurrentSessionKey()); loginServicechangePassword(currentUser, visibleEncryptedPass1, nonce, hashPassword, new AsyncCallback<Void>() { @Override public void onFailure(final Throwable caught) { ChangePasswordFormPresenterthisgetEnvironment() showAlert("Failed change"); ChangePasswordFormPresenterthisgetDisplay() enableChangePasswordButton(true); } public void onSuccess(final Void result) { ChangePasswordFormPresenterthisgetEnvironment() showAlert("Password was changed"); ChangePasswordFormPresenterthisgetEnvironment() setCurrentUserPassword(pass1); ChangePasswordFormPresenterthisgetDisplay() enableChangePasswordButton(true); } }); } }); } }
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The scheme showed in this case can be used for any kind of data exchange For example, if we had a service that sent back sensitive data, it would encrypt it (using the user password, the session key, and a nonce), and add a hash The client would then have to recalculate the hash, and if it matched, then it would decrypt the data and use it
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All Internet applications can be vulnerable to malicious third parties, and thus you ll have to take security in consideration whenever you program with GWT (Also, read the reference mentioned in footnote 2 on security; there are many ways to take in a user) Fortunately, the required steps are simple and easy to apply On the other hand, it s a bit sad to notice that unless you go with the https:// solution, anything you plan or do might be eventually subverted; for example, the user could be tricked into connecting to a malicious server!
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