normalise root path

Signed-off-by: Sebastian Schüpbach <sebastian.schuepbach@unibas.ch>

src/main/scala/ch/memobase/FileUtils.scala

@@ -27,19 +27,22 @@ trait FileUtils {
 
   val rootPath: String
 
+  private val normalize: String => String =
+    path => if (path.endsWith("/")) path.substring(0, path.length - 1) else path
+
   val videoFilePath: (String, MimeType) => String =
-    (id, mimeType) => s"$rootPath/$id.${getFileTypeExtension(mimeType).get}"
+    (id, mimeType) => s"${normalize(rootPath)}/$id.${getFileTypeExtension(mimeType).get}"
 
   val videoPosterPath: String => String =
-    id => s"$rootPath/${id.replace("/derived", "")}-poster.jp2"
+    id => s"${normalize(rootPath)}/${id.replace("/derived", "")}-poster.jp2"
 
   val audioFilePath: String => String =
-    id => s"$rootPath/$id.mp4"
+    id => s"${normalize(rootPath)}/$id.mp4"
 
   val audioSnippetPath: String => String =
-    id => s"$rootPath/$id-intro.mp3"
+    id => s"${normalize(rootPath)}/$id-intro.mp3"
 
   val imageFilePath: String => String =
-    id => s"$rootPath/$id.jp2"
+    id => s"${normalize(rootPath)}/$id.jp2"
 
 }