hopefully fix issues with empty extension

src/controllers/paste_controller.cr

@@ -136,7 +136,8 @@ module Paste69
       end
 
       if form.has_key?("file")
-        filename, body = form["file"]
+        _filename, body = form["file"]
+        _, filename = form["filename"] || {nil, _filename}
         @utils.store_file(
           body,
           content_type,

src/models/paste.cr

@@ -91,13 +91,13 @@ module Paste69
 
           # Also generate a new management token
           paste.mgmt_token = Random.new.urlsafe_base64(config.get("storage.secret_bytes").as_i)
-
-          is_updated = true
         else
           # The file already exists, update the expiration as needed
           paste.expiration = [paste.expiration!, expiration].max.to_i64
           is_new = false
         end
+
+        is_updated = true
       else
         mime = utils.get_mime(data, filename)
         ext = utils.get_ext(mime, filename)

src/services/utils_service.cr

@@ -125,11 +125,11 @@ module Paste69
       gmime = mime.split(";")[0]
       guess = MIME.extensions(gmime).first?
 
-      if !ext
+      if !ext || ext.empty?
         override = @config.get("storage.ext_override").as_h
         if gmime.in?(override)
           ext = override[gmime].as_s
-        elsif guess
+        elsif guess && !guess.empty?
           ext = guess
         else
           ext = ".bin"