如何在python中解码base64 url​​? [英] How to decode base64 url in python?

问题描述

对于Facebook fbml Apps，Facebook发送的sign_request参数在此处说明:

For Facebook fbml Apps Facebook is sending in a signed_request parameter explained here:

http://developers.facebook.com/docs/authentication/canvas

他们已经给出了解码该签名请求的php版本:

They have given the php version of decoding this signed request:

http://pastie.org/1054154

如何在python中做同样的事情?

How to do the same in python?

我尝试了base64模块，但出现了错误的填充错误:

I tried base64 module but I am getting Incorrect padding error:

>>> base64.urlsafe_b64decode("eyJhbGdvcml0aG0iOiJITUFDLVNIQTI1NiIsImV4cGlyZXMiOjEyNzk3NDYwMDAsIm9hdXRoX3Rva2VuIjoiMjk1NjY2Njk1MDY0fDIuRXpwem5IRVhZWkJVZmhGQ2l4ZzYzUV9fLjM2MDAuMTI3OTc0NjAwMC0xMDAwMDA0ODMyNzI5MjN8LXJ6U1pnRVBJTktaYnJnX1VNUUNhRzlNdEY4LiIsInVzZXJfaWQiOiIxMDAwMDA0ODMyNzI5MjMifQ")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/base64.py", line 112, in urlsafe_b64decode
    return b64decode(s, '-_')
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/base64.py", line 76, in b64decode
    raise TypeError(msg)
TypeError: Incorrect padding

推荐答案

显然，在复制原始的base64编码的字符串时，您错过了最后两个字符.给输入字符串加上两个等号(=)后缀，它将被正确解码.

Apparently you missed the last two characters when copying the original base64-encoded string. Suffix the input string with two is-equal (=) signs and it will be decoded correctly.

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