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Code Issues Releases Wiki Activity

[permission] Renamed Permission.permission and added description field

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This commit is contained in:
Benjamin Graillot 2020-02-09 18:14:36 +01:00
parent 94c3a99447
commit 72955ae2d6
1 changed files with 37 additions and 31 deletions
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68
apps/permission/models.py
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@ -57,26 +57,28 @@ class Permission(models.Model):
model = models.ForeignKey(ContentType, on_delete=models.CASCADE, related_name='+')
# A json encoded Q object with the following grammar
# permission -> [] | {} (the empty permission representing all objects)
# permission -> ['AND', permission, …]
# -> ['OR', permission, …]
# -> ['NOT', permission]
# permission -> {key: value, …}
# key -> string
# value -> int | string | bool | null
# -> [parameter]
# query -> [] | {} (the empty query representing all objects)
# query -> ['AND', query, …]
# -> ['OR', query, …]
# -> ['NOT', query]
# query -> {key: value, …}
# key -> string
# value -> int | string | bool | null
# -> [parameter]
#
# Examples:
# Q(is_admin=True) := {'is_admin': ['TYPE', 'bool', 'True']}
# ~Q(is_admin=True) := ['NOT', {'is_admin': ['TYPE', 'bool', 'True']}]
permission = models.TextField()
query = models.TextField()
type = models.CharField(max_length=16, choices=PERMISSION_TYPES)
type = models.CharField(max_length=15, choices=PERMISSION_TYPES)
field = models.CharField(max_length=256, blank=True)
field = models.CharField(max_length=255, blank=True)
description = models.CharField(max_length=255, blank=True)
class Meta:
unique_together = ('model', 'permission', 'type', 'field')
unique_together = ('model', 'query', 'type', 'field')
def clean(self):
if self.field and self.type not in {'view', 'change'}:
@ -86,25 +88,25 @@ class Permission(models.Model):
self.full_clean()
super().save()
def _about(_self, _permission, **kwargs):
def _about(_self, _query, **kwargs):
self = _self
permission = _permission
if len(permission) == 0:
# The permission is either [] or {} and
query = _query
if len(query) == 0:
# The query is either [] or {} and
# applies to all objects of the model
# to represent this we return None
return None
if isinstance(permission, list):
if permission[0] == 'AND':
return functools.reduce(operator.and_, [self._about(permission, **kwargs) for permission in permission[1:]])
elif permission[0] == 'OR':
return functools.reduce(operator.or_, [self._about(permission, **kwargs) for permission in permission[1:]])
elif permission[0] == 'NOT':
return ~self._about(permission[1], **kwargs)
elif isinstance(permission, dict):
if isinstance(query, list):
if query[0] == 'AND':
return functools.reduce(operator.and_, [self._about(query, **kwargs) for query in query[1:]])
elif query[0] == 'OR':
return functools.reduce(operator.or_, [self._about(query, **kwargs) for query in query[1:]])
elif query[0] == 'NOT':
return ~self._about(query[1], **kwargs)
elif isinstance(query, dict):
q_kwargs = {}
for key in permission:
value = permission[key]
for key in query:
value = query[key]
if isinstance(value, list):
# It is a parameter we query its primary key
q_kwargs[key] = kwargs[value[0]].pk
@ -113,18 +115,22 @@ class Permission(models.Model):
return Q(**q_kwargs)
else:
# TODO: find a better way to crash here
raise Exception("Permission {} is wrong".format(self.permission))
raise Exception("query {} is wrong".format(self.query))
def about(self, **kwargs):
permission = json.loads(self.permission)
query = self._about(permission, **kwargs)
"""
Return an InstancedPermission with the parameters
replaced by their values and the query interpreted
"""
query = json.loads(self.query)
query = self._about(query, **kwargs)
return InstancedPermission(self.model, query, self.type, self.field)
def __str__(self):
if self.field:
return _("Can {type} {model}.{field} in {permission}").format(type=self.type, model=self.model, field=self.field, permission=self.permission)
return _("Can {type} {model}.{field} in {query}").format(type=self.type, model=self.model, field=self.field, query=self.query)
else:
return _("Can {type} {model} in {permission}").format(type=self.type, model=self.model, permission=self.permission)
return _("Can {type} {model} in {query}").format(type=self.type, model=self.model, query=self.query)
class UserPermission(models.Model):