Add System Settings page.

src/main/scala/service/SystemSettingsService.scala

@@ -0,0 +1,40 @@
+package service
+
+import util.Directory._
+import SystemSettingsService._
+
+trait SystemSettingsService {
+
+  def saveSystemSettings(settings: SystemSettings): Unit = {
+    val props = new java.util.Properties()
+    props.setProperty(AllowAccountRegistration, settings.allowAccountRegistration.toString)
+    props.store(new java.io.FileOutputStream(GitBucketConf), null)
+  }
+
+
+  def loadSystemSettings(): SystemSettings = {
+    val props = new java.util.Properties()
+    if(GitBucketConf.exists){
+      props.load(new java.io.FileInputStream(GitBucketConf))
+    }
+    SystemSettings(getBoolean(props, "allow_account_registration"))
+  }
+
+}
+
+object SystemSettingsService {
+
+  case class SystemSettings(allowAccountRegistration: Boolean)
+
+  private val AllowAccountRegistration = "allow_account_registration"
+
+  private def getBoolean(props: java.util.Properties, key: String, default: Boolean = false): Boolean = {
+    val value = props.getProperty(key)
+    if(value == null || value.isEmpty){
+      default
+    } else {
+      value.toBoolean
+    }
+  }
+
+}