make determine by extension public

Author: qqmyers

src/main/java/edu/harvard/iq/dataverse/util/FileUtil.java

@@ -598,7 +598,10 @@ public static String determineFileTypeByNameAndExtension(final String fileName)
         return lookupFileTypeByExtension(fileName);
     }
 
-    private static String lookupFileTypeByExtension(final String fileName) {
+    /** determineFileTypeByNameAndExtension should be used instead for any user supplied content. 
+     *
+     */
+    public static String lookupFileTypeByExtension(final String fileName) {
         final String mimetypesFileTypeMapResult = MIME_TYPE_MAP.getContentType(fileName);
         logger.fine("MimetypesFileTypeMap type by extension, for " + fileName + ": " + mimetypesFileTypeMapResult);
         if (mimetypesFileTypeMapResult == null) {