fix inline detection

src/index.coffee

@@ -94,10 +94,9 @@ handleGET = (req, file) ->
     headers['content-type'] = 'text/plain'
 
   # Add content-disposition header to indicate file name
-  if headers['content-type'].startsWith 'image/'
-    headers['content-disposition'] = 'inline; filename=' + fileName
-  else
-    headers['content-disposition'] = 'attachment; filename=' + fileName
+  inline = util.shouldShowInline headers['content-type']
+  headers['content-disposition'] =
+    (if inline then 'inline;' else 'attachment;') + ' filename=' + fileName
 
   # Handle ranged resposes
   if resp.headers.has 'content-range'

src/util.coffee

@@ -32,10 +32,20 @@ idToPath = (id) ->
   id.split ''
     .join '/'
 
+# Determine if we show something inline or not
+shouldShowInline = (mime) ->
+  mime.startsWith 'text/' or
+    mime.startsWith 'image/' or
+    mime.startsWith 'audio/' or
+    mime.startsWith 'video/' or
+    mime == 'application/json' or
+    mime == 'application/javascript'
+
 export {
   getFileName,
   validateLength,
   MAX_UPLOAD_SIZE,
   randomID,
-  idToPath
+  idToPath,
+  shouldShowInline
 }