fix missing prefix to untrail (fixes #62)

Author: robkooper

app/controllers/Application.scala

@@ -31,8 +31,8 @@ class Application @Inject() (files: FileService, collections: CollectionService,
    * @param path the path minus the slash
    * @return moved permanently to path without /
    */
-  def untrail(path: String) = Action {
-    MovedPermanently("/" + path)
+  def untrail(path: String) = Action { implicit request =>
+    MovedPermanently(s"${Utils.baseUrl(request, false)}/${path}")
   }
 
   def swaggerUI = Action { implicit request =>

app/controllers/Utils.scala

@@ -14,8 +14,12 @@ object Utils {
    * Return base url given a request. This will add http or https to the front, for example
    * https://localhost:9443 will be returned if it is using https.
    */
-  def baseUrl(request: Request[Any]) = {
-    routes.Files.list().absoluteURL(https(request))(request).replace("/files", "")
+  def baseUrl(request: Request[Any], absolute: Boolean = true) = {
+    if (absolute) {
+      routes.Files.list().absoluteURL(https(request))(request).replace("/files", "")
+    } else {
+      routes.Files.list().url.replace("/files", "")
+    }
   }
 
   /**