Widget for upload file/image by selecting from local disk or from URL

gistfile1.py

import urlparse
import httplib
from copy import copy
try:
    from cStringIO import StringIO
except:
    from StringIO import StringIO
from django import forms
from django.core.files import File
from django.core.files.temp import NamedTemporaryFile
from django.utils.safestring import mark_safe


class FileURLInput(forms.FileInput):

    def _get_field_file_name(self, name):
        return u'%s_file' % name

    def _get_field_url_name(self, name):
        return u'%s_url' % name

    def render(self, name, value, attrs=None):
        attrs_file = copy(attrs)
        attrs_file['id'] = '%s_file' % attrs_file['id']
        attrs_url = copy(attrs)
        attrs_url['type'] = 'text'
        attrs_url['id'] = '%s_url' % attrs_url['id']
        return mark_safe('\n'.join((
            super(FileURLInput, self).render(
                self._get_field_file_name(name),
                None,
                attrs=attrs_file
            ),
            super(FileURLInput, self).render(
                self._get_field_url_name(name),
                None,
                attrs=attrs_url
            ),
        )))

    def value_from_datadict(self, data, files, name):
        if self._get_field_file_name(name) in files:
            return files.get(self._get_field_file_name(name), None)
        elif data.get(self._get_field_url_name(name)):
            url = urlparse.urlparse(
                data.get(self._get_field_url_name(name), None)
            )
            conn = None
            if url.scheme == 'http':
                conn = httplib.HTTPConnection(url.netloc)
            elif url.scheme == 'https':
                conn = httplib.HTTPSConnection(url.netloc)
            conn.request('GET', url.geturl())
            resp = conn.getresponse()
            if resp.status != 200:
                return File(StringIO())

            fl = NamedTemporaryFile(delete=True)
            fl.write(resp.read())
            fl.flush()
            fl.seek(0)

            return File(fl, name=url.path.rsplit('/', 1)[-1])

        return None