龙卷风 set_secure_cookie Unicode 错误答案

【问题标题】：Tornado set_secure_cookie unicode error龙卷风 set_secure_cookie Unicode 错误
【发布时间】：2013-02-11 22:56:58
【问题描述】：

我最近尝试关注the tornado cookies and secure cookies overview 并给出示例。

当我的服务器尝试执行 set_secure_cookie(..) 时出现一个奇怪的错误：

File "/usr/local/lib/python2.7/dist-packages/tornado-2.4.1-py2.7.egg/tornado/escape.py", line 168, in utf8
assert isinstance(value, unicode)
AssertionError

我做错了什么？

我的 Tornado 服务器：

import tornado.auth
import tornado.escape
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
import Settings

from tornado.options import define, options

define("port", default=8888, help="run on the given port", type=int)

class BaseHandler(tornado.web.RequestHandler):
    def get_current_user(self):
        return self.get_secure_cookie("user")

class MainHandler(BaseHandler):
    @tornado.web.authenticated
    def get(self):
        name = tornado.escape.xhtml_escape(self.current_user)
        self.write("Hello, " + name)

class LoginHandler(BaseHandler):
    def get(self):
        self.write('<html><body><form action="/login" method="post">'
                   'Name: <input type="text" name="name">'
                   '<input type="submit" value="Sign in">'
                   '</form></body></html>')

    def post(self):
        self.set_secure_cookie("user", self.get_argument("name"))
        self.redirect("/")

class Application(tornado.web.Application):
    def __init__(self):
        handlers = [
            (r"/", MainHandler),
            (r"/login", LoginHandler),
        ]
        settings = {
            "template_path":Settings.TEMPLATE_PATH,
            "static_path":Settings.STATIC_PATH,
            "debug":Settings.DEBUG,
            "cookie_secret": Settings.COOKIE_SECRET,
            "login_url": "/login"
        }
        tornado.web.Application.__init__(self, handlers, **settings)

def main():
    tornado.options.parse_command_line()
    http_server = tornado.httpserver.HTTPServer(Application())
    http_server.listen(options.port)
    tornado.ioloop.IOLoop.instance().start()

if __name__ == "__main__":
    main()

完整的追溯：

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/tornado-2.4.1-py2.7.egg/tornado/web.py", line 1042, in _execute
    getattr(self, self.request.method.lower())(*args, **kwargs)
  File "/home/gvincent/Dropbox/workspace/scubabook/WebServer.py", line 31, in post
    self.set_secure_cookie("user", self.get_argument("name"))
  File "/usr/local/lib/python2.7/dist-packages/tornado-2.4.1-py2.7.egg/tornado/web.py", line 426, in set_secure_cookie
    self.set_cookie(name, self.create_signed_value(name, value),
  File "/usr/local/lib/python2.7/dist-packages/tornado-2.4.1-py2.7.egg/tornado/web.py", line 438, in create_signed_value
    name, value)
  File "/usr/local/lib/python2.7/dist-packages/tornado-2.4.1-py2.7.egg/tornado/web.py", line 2029, in create_signed_value
    signature = _create_signature(secret, name, value, timestamp)
  File "/usr/local/lib/python2.7/dist-packages/tornado-2.4.1-py2.7.egg/tornado/web.py", line 2066, in _create_signature
    hash = hmac.new(utf8(secret), digestmod=hashlib.sha1)
  File "/usr/local/lib/python2.7/dist-packages/tornado-2.4.1-py2.7.egg/tornado/escape.py", line 168, in utf8
    assert isinstance(value, unicode)
AssertionError

【问题讨论】：

什么是完整回溯？
我在问题的末尾添加了完整的回溯
我认为问题在于您的Settings.COOKIE_SECRET 的值。您使用的是什么值？
COOKIE_SECRET = 'L8LwECiNRxq2N0N2eGxx9MZlrpmuMEimlydNX/vt1LM=' 我用它来生成我的 COOKIE_SECRET base64.b64encode(uuid.uuid4().bytes + uuid.uuid4().bytes)

标签： python cookies unicode tornado

【解决方案1】：

您的Settings.COOKIE_SECRET 值必须是unicode 或str 对象。

您看到的断言只有在不是这种情况时才会被提出。您需要三次检查您的 Settings.COOKIE_SECRET 值是否不是列表、元组、字节数组或任何其他不是 str 或 unicode 的类型。

【讨论】：

我用它来生成我的 COOKIE_SECRET base64.b64encode(uuid.uuid4().bytes + uuid.uuid4().bytes)
@guillaumevincent：这确实是正确的类型，但是在使用该值时，它不再是。在您定义settings 映射的代码中，请添加`print type(settings['cookie_secret']), repr(settings['cookie_secret']) 进行验证。
'L8LwECiNRxq2N0N2eGxx9MZlrpmuMEimlydNX/vt1LM='