Add recommended and minimum required version checks

app/build.gradle

@@ -30,12 +30,16 @@ android {
 
     buildTypes {
         release {
+            buildConfigField "String", "REQUIRED_SERVER_VERSION", '"0.62.0"'
+            buildConfigField "String", "RECOMMENDED_SERVER_VERSION", '"0.63.0"'
             signingConfig signingConfigs.release
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
 
         debug {
+            buildConfigField "String", "REQUIRED_SERVER_VERSION", '"0.62.0"'
+            buildConfigField "String", "RECOMMENDED_SERVER_VERSION", '"0.63.0"'
             applicationIdSuffix ".dev"
         }
     }

app/src/main/java/chat/rocket/android/authentication/login/presentation/LoginPresenter.kt

 package chat.rocket.android.authentication.login.presentation
 
+import chat.rocket.android.BuildConfig
 import chat.rocket.android.authentication.presentation.AuthenticationNavigator
 import chat.rocket.android.core.lifecycle.CancelStrategy
 import chat.rocket.android.helper.NetworkHelper
@@ -268,17 +269,33 @@ class LoginPresenter @Inject constructor(private val view: LoginView,
     private fun checkServerInfo() {
         launchUI(strategy) {
             val serverInfo = client.serverInfo()
-            val isNiceVersion = isRequiredVersionOk(serverInfo.version)
-            if (isNiceVersion) {
-                Timber.i("Your version is nice! (Requires: 0.62.0, Yours: ${serverInfo.version})")
+            val thisServerVersion = serverInfo.version
+            val isRequiredVersion = isRequiredServerVersion(thisServerVersion)
+            val isRecommendedVersion = isRecommendedServerVersion(thisServerVersion)
+            if (isRequiredVersion) {
+                if (isRecommendedVersion) {
+                    view.alertNotRecommendedVersion()
                 } else {
+                    Timber.i("Your version is nice! (Requires: 0.62.0, Yours: $thisServerVersion)")
+                }
+            } else {
+                if (!isRecommendedVersion) {
+                    view.blockAndAlertNotRequiredVersion()
                     Timber.i("Oops. Looks like your server is out-of-date! Please, upgrade your server for a better experience!")
                 }
             }
         }
+    }
+
+    private fun isRequiredServerVersion(version: String): Boolean {
+        return isMinimumVersion(version, getVersionDistilled(BuildConfig.REQUIRED_SERVER_VERSION))
+    }
+
+    private fun isRecommendedServerVersion(version: String): Boolean {
+        return isMinimumVersion(version, getVersionDistilled(BuildConfig.RECOMMENDED_SERVER_VERSION))
+    }
 
-    private fun isRequiredVersionOk(version: String): Boolean {
-        val required = getVersionDistilled("0.62.0")
+    private fun isMinimumVersion(version: String, required: VersionInfo): Boolean {
         val thisVersion = getVersionDistilled(version)
         with(thisVersion) {
             if (major < required.major) {

app/src/main/java/chat/rocket/android/authentication/login/presentation/LoginView.kt

@@ -186,4 +186,14 @@ interface LoginView : LoadingView, MessageView, InternetView {
      * Alerts the user about a wrong inputted password.
      */
     fun alertWrongPassword()
+
+    /**
+     * Alerts the user about the server version not meeting the recommended server version.
+     */
+    fun alertNotRecommendedVersion()
+
+    /**
+     * Block user to proceed and alert him due to server having an unsupported server version.
+     */
+    fun blockAndAlertNotRequiredVersion()
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/authentication/login/ui/LoginFragment.kt

@@ -289,6 +289,14 @@ class LoginFragment : Fragment(), LoginView {
         text_password.requestFocus()
     }
 
+    override fun alertNotRecommendedVersion() {
+
+    }
+
+    override fun blockAndAlertNotRequiredVersion() {
+
+    }
+
     private fun showRemainingSocialAccountsView() {
         social_accounts_container.postDelayed({
             (0..social_accounts_container.childCount)