Add TODO and validate inputs.

app/src/main/java/chat/rocket/android/authentication/signup/presentation/SignupPresenter.kt

 package chat.rocket.android.authentication.signup.presentation
 
+import android.widget.EditText
 import chat.rocket.android.authentication.infraestructure.AuthTokenRepository
 import chat.rocket.android.authentication.presentation.AuthenticationNavigator
 import chat.rocket.android.core.lifecycle.CancelStrategy
 import chat.rocket.android.util.launchUI
+import chat.rocket.android.util.textContent
 import chat.rocket.common.RocketChatException
 import chat.rocket.common.util.PlatformLogger
 import chat.rocket.core.RocketChatClient
@@ -20,7 +22,7 @@ class SignupPresenter @Inject constructor(private val view: SignupView,
                                           private val okHttpClient: OkHttpClient,
                                           private val logger: PlatformLogger,
                                           private val repository: AuthTokenRepository) {
-
+    // TODO: Create a single entry point to RocketChatClient
     val client: RocketChatClient = RocketChatClient.create {
         httpClient = okHttpClient
         restUrl = HttpUrl.parse(navigator.currentServer)!!
@@ -29,10 +31,18 @@ class SignupPresenter @Inject constructor(private val view: SignupView,
         platformLogger = logger
     }
 
-    fun signup(email: String, name: String, username: String, password: String) {
-        // TODO - validate input
+    fun signup(nameEditText: EditText, emailEditText: EditText, usernameEditText: EditText, passwordEditText: EditText) {
+        val name = nameEditText.textContent
+        val email = emailEditText.textContent
+        val username = usernameEditText.textContent
+        val password = passwordEditText.textContent
 
-        launchUI(strategy) {
+        when {
+            name.isBlank() -> view.shakeView(nameEditText)
+            email.isBlank() -> view.shakeView(emailEditText)
+            username.isBlank() -> view.shakeView(usernameEditText)
+            password.isEmpty() -> view.shakeView(passwordEditText)
+            else -> launchUI(strategy) {
                 view.showLoading()
 
                 try {
@@ -44,10 +54,14 @@ class SignupPresenter @Inject constructor(private val view: SignupView,
 
                     navigator.toChatList()
                 } catch (ex: RocketChatException) {
-                view.onSignupError(ex.message)
+                    val errorMessage = ex.message
+                    if (errorMessage != null) {
+                        view.showMessage(errorMessage)
+                    }
                 } finally {
                     view.hideLoading()
                 }
             }
         }
+    }
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/authentication/twofactor/presentation/TwoFAPresenter.kt

 package chat.rocket.android.authentication.twofactor.presentation
 
+import android.widget.EditText
 import chat.rocket.android.authentication.infraestructure.AuthTokenRepository
 import chat.rocket.android.authentication.presentation.AuthenticationNavigator
 import chat.rocket.android.core.lifecycle.CancelStrategy
 import chat.rocket.android.util.launchUI
+import chat.rocket.android.util.textContent
 import chat.rocket.common.RocketChatException
 import chat.rocket.common.util.PlatformLogger
 import chat.rocket.core.RocketChatClient
@@ -18,7 +20,7 @@ class TwoFAPresenter @Inject constructor(private val view: TwoFAView,
                                          private val okHttpClient: OkHttpClient,
                                          private val logger: PlatformLogger,
                                          private val repository: AuthTokenRepository) {
-
+    // TODO: Create a single entry point to RocketChatClient
     val client: RocketChatClient = RocketChatClient.create {
         httpClient = okHttpClient
         restUrl = HttpUrl.parse(navigator.currentServer)!!
@@ -27,14 +29,17 @@ class TwoFAPresenter @Inject constructor(private val view: TwoFAView,
         platformLogger = logger
     }
 
-    fun authenticate(username: String, password: String, pin: String) {
-        // TODO - validate input
-
+    // TODO: If the usernameOrEmail and password was informed by the user on the previous screen, then we should pass only the pin, like this: fun authenticate(pin: EditText)
+    fun authenticate(usernameOrEmail: String, password: String, pin: EditText) {
+       val twoFACode = pin.textContent
+        if (twoFACode.isBlank()) {
+            view.shakeView(pin)
+        } else {
             launchUI(strategy) {
                 view.showLoading()
                 try {
-                val token = client.login(username, password, pin)
-
+                    val token = client.login(usernameOrEmail, password, twoFACode)
+                    // Todo Salve token.
                     navigator.toChatList()
                 } catch (ex: RocketChatException) {
                     val errorMessage = ex.message
@@ -46,6 +51,7 @@ class TwoFAPresenter @Inject constructor(private val view: TwoFAView,
                 }
             }
         }
+    }
 
     fun signup() {
         navigator.toSignUp(navigator.currentServer!!)