Python的urllib2/oauth2请求UbuntuOne文件API返回401未授权错误

Question

我正在尝试发起一个基本的UbuntuOne API请求。

正如在这个链接上所解释的，我获取了OAUTH令牌，然后把它传递给UbuntuOne服务。
我顺利得到了令牌和消费者信息。
接下来，我尝试发起一个/api/file_storage/v1的API请求（可以参考这个链接）。请求是用OAUTH令牌进行签名的。

下面的代码片段就是我执行的代码（去掉了邮箱、密码和描述字段）。令牌和消费者数据都正确返回了。但是，当我发起/api/file_storage/v1请求时，服务器返回了'401 UNAUTHORIZED'的错误... 有人知道这是为什么吗？

import base64
import json
import urllib
import urllib2
import oauth2

email = 'bla'
password = 'foo'
description = 'bar'

class Unauthorized(Exception):
  """The provided email address and password were incorrect."""

def acquire_token(email_address, password, description):
  """Aquire an OAuth access token for the given user."""
  # Issue a new access token for the user.
  request = urllib2.Request(
    'https://login.ubuntu.com/api/1.0/authentications?' +
    urllib.urlencode({'ws.op': 'authenticate', 'token_name': description}))
  request.add_header('Accept', 'application/json')
  request.add_header('Authorization', 'Basic %s' % base64.b64encode('%s:%s' % (email_address, password)))
  try:
    response = urllib2.urlopen(request)
  except urllib2.HTTPError, exc:
    if exc.code == 401: # Unauthorized
      raise Unauthorized("Bad email address or password")
    else:
      raise
  data = json.load(response)
  consumer = oauth2.Consumer(data['consumer_key'], data['consumer_secret'])
  token = oauth2.Token(data['token'], data['token_secret'])

  # Tell Ubuntu One about the new token.
  get_tokens_url = ('https://one.ubuntu.com/oauth/sso-finished-so-get-tokens/')
  oauth_request = oauth2.Request.from_consumer_and_token(consumer, token, 'GET', get_tokens_url)
  oauth_request.sign_request(oauth2.SignatureMethod_PLAINTEXT(), consumer, token)
  request = urllib2.Request(get_tokens_url)
  for header, value in oauth_request.to_header().items():
    request.add_header(header, value)
  response = urllib2.urlopen(request)

  return consumer, token

if __name__ == '__main__':
  consumer, token = acquire_token(email, password, description)
  print 'Consumer:', consumer
  print 'Token:', token

  url = 'https://one.ubuntu.com/api/file_storage/v1'

  oauth_request = oauth2.Request.from_consumer_and_token(consumer, token, 'GET', url)
  oauth_request.sign_request(oauth2.SignatureMethod_PLAINTEXT(), consumer, token)

  request = urllib2.Request(url)
  request.add_header('Accept', 'application/json')

  for header, value in oauth_request.to_header().items():
    request.add_header(header, value)

  response = urllib2.urlopen(request)

认证文件存储 oauth 401错误 api请求 ubuntuone oauth令牌消费者信息

Python的urllib2/oauth2请求UbuntuOne文件API返回401未授权错误

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