A container class for authorization scopes
scopes exposes the Set class, a container type intended to simplify checking authorization scope.
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.
- Python 2.7, 3.2+
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.
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
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
Copyright (c) 2016 Te-jé Rodgers
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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