Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
generic support library for signed-token-based auth schemes
Python
branch: master
Failed to load latest commit information.
tokenlib Prep version 0.3.1
.gitignore Support for Python3.
CHANGES.txt Prep version 0.3.1
LICENSE.txt Clarify licensing info
MANIFEST.in Initial commit.
README.rst Add to the README.
setup.py Prep version 0.3.1
tox.ini Support for Python3.

README.rst

tokenlib

This is generic support library for doing token-based authentication. You might use it to build a login system using bearer tokens, two-legged oauth, or MAC Access authentication.

Given a server-side master secret, you can serialize a dict of data into an opaque, unforgeable authentication token:

>>> token = tokenlib.make_token({"userid": 42}, secret="I_LIKE_UNICORNS")
>>> print token
eyJzYWx0IjogImY0NTU5NCIsICJleHBpcmVzIjogMTMyOTg3NTI2Ny4xNDQ5MzUsICJ1c2VyaWQiOiA0Mn0miXCe4NQQtXTE8NXSGcsL6dzSuQ==

Later, you can use the same secret to verify the token and extract the embedded data:

>>> data = tokenlib.parse_token(token, secret="I_LIKE_UNICORNS")
>>> print data
{u'userid': 42, u'expires': 1329875384.073159, u'salt': u'1c033f'}

Notice that the data includes an expiry time. If you try to parse an expired token, it will fail:

>>> # Use now=XXX to simulate a time in the future.
>>> tokenlib.parse_token(token, secret="I_LIKE_UNICORNS", now=9999999999)
Traceback (most recent call last):
...
ValueError: token has expired

Likewise, it will fail if the token was constructed with a non-matching secret key:

>>> tokenlib.parse_token(token, secret="I_HATE_UNICORNS")
Traceback (most recent call last):
...
ValueError: token has invalid signature

Each token also has an associated "token secret". This is a secret key that can be shared with the consumer of the token to enable authentication schemes such as MAC Access Authentication of Two-Legged OAuth:

>>> key = tokenlib.get_token_secret(token, secret="I_LIKE_UNICORNS")
>>> print key
EZslG8yEYTGyDvBjRnxGipL5Kd8=

For applications that are using the same settings over and over again, you will probably want to create a TokenManager object rather than using the module-level convenience functions:

>>> manager = tokenlib.TokenManager(secret="I_LIKE_UNICORNS")
>>> data = manager.parse_token(token)
>>> print data
{u'userid': 42, u'expires': 1329875384.073159, u'salt': u'1c033f'}

This will let you customize e.g. the token expiry timeout or hash module without repeating the settings in each call.

Something went wrong with that request. Please try again.