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Cross Site Request Forgery Middleware.
This module provides a middleware that implements protection
against request forgeries from other sites.
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Given a secret (assumed to be a string of CSRF_ALLOWED_CHARS), generate a
token by adding a mask and applying it to the secret.
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Given a token (assumed to be a string of CSRF_ALLOWED_CHARS, of length
CSRF_TOKEN_LENGTH, and that its first half is a mask), use it to decrypt
the second half to produce the original secret.
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Return the CSRF token required for a POST form. The token is an
alphanumeric value. A new token is created if one is not already set.
A side effect of calling this function is to make the csrf_protect
decorator and the CsrfViewMiddleware add a CSRF cookie and a 'Vary: Cookie'
header to the outgoing response. For this reason, you may need to use this
function lazily, as is done by the csrf context processor.
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Change the CSRF token in use for a request - should be done on login
for security purposes.
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Require a present and correct csrfmiddlewaretoken for POST requests that
have a CSRF cookie, and set an outgoing CSRF cookie.
This middleware should be used in conjunction with the {% csrf_token %}
template tag.
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