[Zope3-dev] Important IFile bug!

[Janko Hauser]

Jim Fulton schrieb:
> Roger Ineichen wrote:
>
> ...
>
>
>>Ok, what can I do?
>>
>>Should I implement a IData field and enhance this field?
>
>
> I think you should define an IMime schema that defines methods
> to get and set the data. I suggest that this should be a
> file-like interface, with, at least, read and write.
> It should have a mime-type attribute and an encoding
> attribute, for use with text.
>
> Then you should define a mine field (IMImeField/MimeField)
> for data with this interface.
>
In a former discussion there seemed to be the conclusion that the field
should actually be an object, which keeps the additional metadata. Has
this been dropped?

> Finally, you need a widget.
>
> The widget should support:
>
> - file-upload
>
> - text area if content type is text/* *and* if an encoding
>    is specified.
>
> - entry of content type and, for text types, the encoding
>
>
>>The validate method of this field should allowes to store
>>String and FileChunk? Others?
>
>
> The validate method should accept strings and objects
> with read methods.
>
>
>>Is there a python lib for reading files and find the
>>content type like stefan was implementing for images?
>
>
> Of course, in the unlikely event that the client sends the
> file type and/or encoding with the file upload, you should
> use that information.  Otherwise, use zope.app.content_types,
> which seems to use the Python mimetypes module.
>
> If you feel especially inspired, it would be nice to store
> file-upload data in a session if someone submits a form
> with a file-upload using other than the main submit
> button or if there are validation errors on other fields.
> IOW, it would be cool if the widget stored the data in a
> session so that the data wasn't lost on a redisplay.
>

Wouldn't this circumvent the memory savings we gain through the
chunked upload?

Roger I would be interested to work with you on this. I have already
made a crude FileField with widget, but not in the context of zope3
but Five. There I store the data as a Zope2 File object.

With regards,

__Janko