scopes

scopes exposes the Set class, a container type intended to simplify checking authorization scope.

Installation

You can install scopes from PyPi:

> pip install scopes

That should install all the dependencies for you. If you want to install directly from source, clone the git repository and run the standard python setup.py install command.

Dependencies

• Python 2.7, 3.2+

Usage

scopes.Set implements the __contains__ magic method, making it easy to check if a particular scope and permission is expressed in a set of scopes.

>>> from scopes import Set
>>> Set(['user/emails+r'])
Set(['user/emails'])
>>> 'user/emails' in Set(['user/emails'])
True
>>> ('foo/bar', 'foo/baz') <= Set('foo')
True
>>> ['foo/bar', 'foo/baz', 'extra'] <= Set(['foo', 'bar'])
False
>>> Set(['foo', 'bar']) >= ('foo/bar', 'foo/baz')
True

A Set in fact works almost like any set type.

>>> len(Set(['user/emails', 'user/repo']))
2
>>> list(Set(['user/emails+r', 'user/repo+aaaaa']).formatted())
['user/emails', 'user/repo+a']

They can be quickly parsed from strings too.

>>> Set("user/emails+r user/emails+n")
Set(['user/emails', 'user/emails+n'])

This method uses a single space as a separator.

Permissions

You can append letters to scope items to express certain permissions. Any ascii letter that follows the permission separator (+ by default) is interpreted as a permission. When checking for an item in the scope list, both its value and permission must match at least one item in the list.

>>> 'user/emails+a' in Set(['user/emails'])
False
>>> 'user/emails+a' in Set(['user/emails+a'])
True

Indicate multiple permissions in a scope list item by including more than one letter after the + symbol. Duplicate permissions are ignored.

>>> 'user/repo+w' in Set(['user/repo+abcd', 'user/repo+rw'])
True

Permissions are totally arbitrary, except that +r is assumed by default when no permissions are explicitly given.

>>> 'user/emails+r' in Set(['user/emails'])
True

You can change the default permissions to whatever you like.

>>> 'user/emails+n' in Set(['user/emails'], default_permissions='n')
True
>>> 'user/emails+q' in Set(['user/emails'], default_permissions='pq')
True
>>> 'user/emails+p' in Set(['user/emails'], default_permissions='pq')
True

The permissions separator is also configurable.

>>> 'user/emails|r' in Set(['user/emails'], permission_sep='|')
True

Parents

The / symbol is the default child separator. Parent scope items automatically 'contain' child items in the scope list.

>>> 'user/emails+r' in Set(['user'])
True
>>> 'user/emails+w' in Set(['user'])
False
>>> 'user/emails+rw' in Set(['user+w', 'user/emails+r'])
True

The child separator can also be changed:

>>> 'user:emails+r' in Set(['user'], child_sep=':')
True