Rewrite root directory files to Kotlin

app/src/main/java/com/github/gotify/Settings.kt

@@ -0,0 +1,56 @@
+package com.github.gotify
+
+import android.content.Context
+import android.content.SharedPreferences
+import com.github.gotify.client.model.User
+
+class Settings(context: Context) {
+    private val sharedPreferences: SharedPreferences
+    var url: String
+        get() = sharedPreferences.getString("url", "")!!
+        set(value) = sharedPreferences.edit().putString("url", value).apply()
+    var token: String
+        get() = sharedPreferences.getString("token", "")!!
+        set(value) = sharedPreferences.edit().putString("token", value).apply()
+    var user: User? = null
+        get() {
+            val username = sharedPreferences.getString("username", null)
+            val admin = sharedPreferences.getBoolean("admin", false)
+            return if (username != null) {
+                User().name(username).admin(admin)
+            } else {
+                User().name("UNKNOWN").admin(false)
+            }
+        }
+        private set
+    var serverVersion: String
+        get() = sharedPreferences.getString("version", "UNKNOWN")!!
+        set(value) = sharedPreferences.edit().putString("version", value).apply()
+    var cert: String
+        get() = sharedPreferences.getString("cert", "")!!
+        set(value) = sharedPreferences.edit().putString("cert", value).apply()
+    var validateSSL: Boolean
+        get() = sharedPreferences.getBoolean("validateSSL", true)
+        set(value) = sharedPreferences.edit().putBoolean("validateSSL", value).apply()
+
+    init {
+        sharedPreferences = context.getSharedPreferences("gotify", Context.MODE_PRIVATE)
+    }
+
+    fun tokenExists(): Boolean = token.isNotEmpty()
+
+    fun clear() {
+        url = ""
+        token = ""
+        validateSSL = true
+        cert = ""
+    }
+
+    fun setUser(name: String?, admin: Boolean) {
+        sharedPreferences.edit().putString("username", name).putBoolean("admin", admin).apply()
+    }
+
+    fun sslSettings(): SSLSettings {
+        return SSLSettings(validateSSL, cert)
+    }
+}