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80 lines
3.1 KiB
80 lines
3.1 KiB
try: |
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set |
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except NameError: |
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from sets import Set as set # Python 2.3 fallback |
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from django.db import connection |
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from django.contrib.auth.models import User |
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class ModelBackend(object): |
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""" |
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Authenticates against django.contrib.auth.models.User. |
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""" |
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# TODO: Model, login attribute name and password attribute name should be |
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# configurable. |
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def authenticate(self, username=None, password=None): |
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try: |
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user = User.objects.get(username=username) |
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if user.check_password(password): |
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return user |
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except User.DoesNotExist: |
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return None |
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def get_group_permissions(self, user_obj): |
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""" |
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Returns a set of permission strings that this user has through his/her |
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groups. |
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""" |
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if not hasattr(user_obj, '_group_perm_cache'): |
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cursor = connection.cursor() |
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# The SQL below works out to the following, after DB quoting: |
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# cursor.execute(""" |
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# SELECT ct."app_label", p."codename" |
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# FROM "auth_permission" p, "auth_group_permissions" gp, "auth_user_groups" ug, "django_content_type" ct |
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# WHERE p."id" = gp."permission_id" |
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# AND gp."group_id" = ug."group_id" |
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# AND ct."id" = p."content_type_id" |
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# AND ug."user_id" = %s, [self.id]) |
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qn = connection.ops.quote_name |
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sql = """ |
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SELECT ct.%s, p.%s |
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FROM %s p, %s gp, %s ug, %s ct |
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WHERE p.%s = gp.%s |
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AND gp.%s = ug.%s |
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AND ct.%s = p.%s |
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AND ug.%s = %%s""" % ( |
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qn('app_label'), qn('codename'), |
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qn('auth_permission'), qn('auth_group_permissions'), |
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qn('auth_user_groups'), qn('django_content_type'), |
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qn('id'), qn('permission_id'), |
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qn('group_id'), qn('group_id'), |
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qn('id'), qn('content_type_id'), |
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qn('user_id'),) |
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cursor.execute(sql, [user_obj.id]) |
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user_obj._group_perm_cache = set(["%s.%s" % (row[0], row[1]) for row in cursor.fetchall()]) |
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return user_obj._group_perm_cache |
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def get_all_permissions(self, user_obj): |
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if not hasattr(user_obj, '_perm_cache'): |
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user_obj._perm_cache = set([u"%s.%s" % (p.content_type.app_label, p.codename) for p in user_obj.user_permissions.select_related()]) |
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user_obj._perm_cache.update(self.get_group_permissions(user_obj)) |
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return user_obj._perm_cache |
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def has_perm(self, user_obj, perm): |
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return perm in self.get_all_permissions(user_obj) |
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def has_module_perms(self, user_obj, app_label): |
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""" |
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Returns True if user_obj has any permissions in the given app_label. |
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""" |
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for perm in self.get_all_permissions(user_obj): |
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if perm[:perm.index('.')] == app_label: |
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return True |
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return False |
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def get_user(self, user_id): |
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try: |
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return User.objects.get(pk=user_id) |
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except User.DoesNotExist: |
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return None
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