[android] backend: normalize base url

android/app/src/main/java/net/buzzert/kordophonedroid/ui/shared/ServerConfigRepository.kt

@@ -24,7 +24,7 @@ data class ServerConfig(
         fun loadFromSettings(context: Context): ServerConfig {
             val prefs = getSharedPreferences(context)
             return ServerConfig(
-                serverName = prefs.getString("serverName", null),
+                serverName = prefs.getString("serverName", null).normalizedBaseUrl(),
                 authentication = ServerAuthentication.loadFromEncryptedSettings(context)
             )
         }
@@ -37,7 +37,7 @@ data class ServerConfig(
     fun saveToSettings(context: Context) {
         val prefs = getSharedPreferences(context)
         prefs.edit {
-            putString("serverName", serverName)
+            putString("serverName", serverName.normalizedBaseUrl())
             apply()
         }
 
@@ -45,6 +45,11 @@ data class ServerConfig(
     }
 }
 
+fun String?.normalizedBaseUrl(): String? {
+    val value = this?.trim()?.takeIf { it.isNotEmpty() } ?: return null
+    return if (value.endsWith("/")) value else "$value/"
+}
+
 data class ServerAuthentication(
     val username: String,
     val password: String,
@@ -101,7 +106,9 @@ class ServerConfigRepository @Inject constructor(
 
     fun applyConfig(applicator: ServerConfig.() -> Unit) {
         val config = _serverConfig.value.copy()
-        _serverConfig.value = config.apply(applicator)
+        _serverConfig.value = config.apply(applicator).also {
+            it.serverName = it.serverName.normalizedBaseUrl()
+        }
         _serverConfig.value.saveToSettings(context)
     }
 }