This is something of an artificial intelligence problem. First, if it claims to be ASCII and contains bytes with the high bit set, be suspicious. If it claims to be UTF-8 (or another UTF encoding), see if python can "decode" it into a unicode string (there may be an external app that will try this).
For application specific types, start by checking the magic numbers. (On *nix use the "file" command or its magic number database.) If it claims to be an image, see if PIL can read it. There are similar possibilities for PDF, and probably others. And ask some virus scanner about it. (F-prot, I believe, is one that is available for *nix.) As far as I know, it's probably at least as hard as you originally thought. At least, I don't know of any shortcuts. Bill On Sat, Dec 25, 2010 at 11:31 PM, Andy <selforgani...@gmail.com> wrote: > In the doc (http://docs.djangoproject.com/en/1.2/topics/http/file- > uploads/#uploadedfile-objects) it is stated that: > > "UploadedFile.content_type > The content-type header uploaded with the file (e.g. text/plain or > application/pdf). Like any data supplied by the user, you shouldn't > trust that the uploaded file is actually this type. You'll still need > to validate that the file contains the content that the content-type > header claims -- "trust but verify." > > "UploadedFile.charset > For text/* content-types, the character set (i.e. utf8) supplied by > the browser. Again, "trust but verify" is the best policy here." > > So how do I verify the content-type & charset of uploaded file? > > Thanks. > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To post to this group, send email to django-us...@googlegroups.com. > To unsubscribe from this group, send email to > django-users+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
