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Grant roles and logins based on IP address.
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On each request, ``ip_map`` is checked against ``REMOTE_ADDR``
and logins and roles are assigned based on that.
``ip_map`` is a map of {ip_mask: (username, roles)}. Either
``username`` or ``roles`` may be None. Roles may also be prefixed
with ``-``, like ``'-system'`` meaning that role should be
revoked. ``'__remove__'`` for a username will remove the username.
If ``clobber_username`` is true (default) then any user
specification will override the current value of ``REMOTE_USER``.
``'__remove__'`` will always clobber the username.
``ip_mask`` is something that `paste.util.ip4:IP4Range
`_ can parse. Simple IP
addresses, IP/mask, ip<->ip ranges, and hostnames are allowed.
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