problem with fileupload and the fields with non-latin chars

[kolyvan]

The problem in FileUploadSupport.extractMultipartParams()

 if (item.isFormField)
  BodyParams(params.fileParams, params.formParams + ((item.getFieldName, item.getString // < here

FileItem.getString returns string in "ISO-8859-1" latin encoding.
if there is a text field on a form with non-latin chars then this method returns a broken string .

Possible fix it's to pass a charset name into getString method: item.getString("UTF-8")

[rossabaker]

This is a thorny problem. Browsers aren't usually explicit about the charset of form parts, and the actual encoding is browser-specific and may depend on attributes of the form being submitted. Imperfect solution:

1. Look for a charset on the form part. If it's set, trust it.
2. Otherwise, default to the kernel's defaultCharacterEncoding (which itself defaults to UTF-8).
3. Provide fileItemToString hook so apps can apply custom hacks as necessary.