Webpy and UnicodeDecodeError

[Oscar Del Ben]

So I'm trying to send a file through webpy and urllib2 but I can't get
around these UnicodeErrors. Here's the code:

# controller

x = web.input(video_original={})
params = {'foo': x['foo']}

files = (('video[original]', 'test', x['video_original'].file.read
()),)
client.upload(upload_url, params, files, access_token())

# client library

def __encodeMultipart(self, fields, files):
        """
        fields is a sequence of (name, value) elements for regular
form fields.
        files is a sequence of (name, filename, value) elements for
data to be uploaded as files
        Return (content_type, body) ready for httplib.HTTP instance
        """
        boundary = mimetools.choose_boundary()
        crlf = '\r\n'

        l = []
        for k, v in fields.iteritems():
            l.append('--' + boundary)
            l.append('Content-Disposition: form-data; name="%s"' % k)
            l.append('')
            l.append(v)
        for (k, f, v) in files:
            l.append('--' + boundary)
            l.append('Content-Disposition: form-data; name="%s";
filename="%s"' % (k, f))
            l.append('Content-Type: %s' % self.__getContentType(f))
            l.append('')
            l.append(v)
        l.append('--' + boundary + '--')
        l.append('')
        body = crlf.join(l)

        return boundary, body

    def __getContentType(self, filename):
        return mimetypes.guess_type(filename)[0] or 'application/octet-
stream'

    def upload(self, path, post_params, files, token=None):

      if token:
        token = oauth.OAuthToken.from_string(token)

      url = "http://%s%s" % (self.authority, path)

      (boundary, body) = self.__encodeMultipart(post_params, files)

      headers = {'Content-Type': 'multipart/form-data; boundary=%s' %
boundary,
          'Content-Length': str(len(body))
          }

      request = oauth.OAuthRequest.from_consumer_and_token(
        self.consumer,
        token,
        http_method='POST',
        http_url=url,
        parameters=post_params
      )

      request.sign_request(oauth.OAuthSignatureMethod_HMAC_SHA1(),
self.consumer, token)

      request = urllib2.Request(request.http_url, postdata=body,
headers=headers)
      request.get_method = lambda: 'POST'

      return urllib2.urlopen(request)

Unfortunately I get two kinds of unicode error, the first one in the
crlf.join(l):

Traceback (most recent call last):
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 242, in process
    return self.handle()
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 233, in handle
    return self._delegate(fn, self.fvars, args)
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 412, in _delegate
    return handle_class(cls)
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 387, in handle_class
    return tocall(*args)
  File "/Users/oscar/projects/work/whitelabel/code.py", line 328, in
POST
    return simplejson.load(client.upload(upload_url, params, files,
access_token()))
  File "/Users/oscar/projects/work/whitelabel/oauth_client.py", line
131, in upload
    (boundary, body) = self.__encodeMultipart(post_params, files)
  File "/Users/oscar/projects/work/whitelabel/oauth_client.py", line
111, in __encodeMultipart
    body = crlf.join(l)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xb7 in position
42: ordinal not in range(128)


And here's another one:

Traceback (most recent call last):
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 242, in process
    return self.handle()
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 233, in handle
    return self._delegate(fn, self.fvars, args)
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 412, in _delegate
    return handle_class(cls)
  File "/Users/oscar/projects/work/whitelabel/web/application.py",
line 387, in handle_class
    return tocall(*args)
  File "/Users/oscar/projects/work/whitelabel/code.py", line 328, in
POST
    return simplejson.load(client.upload(upload_url, params, files,
access_token()))
  File "/Users/oscar/projects/work/whitelabel/oauth_client.py", line
131, in upload
    (boundary, body) = self.__encodeMultipart(post_params, files)
  File "/Users/oscar/projects/work/whitelabel/oauth_client.py", line
111, in __encodeMultipart
    body = crlf.join(l)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xb7 in position
42: ordinal not in range(128)

Does anyone know why this errors happens and what I should do to
prevent them? Many thanks.

Oscar