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https://gitlab.crans.org/bde/nk20
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[permission] Renamed Permission.permission and added description field
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@ -57,26 +57,28 @@ class Permission(models.Model):
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model = models.ForeignKey(ContentType, on_delete=models.CASCADE, related_name='+')
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# A json encoded Q object with the following grammar
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# permission -> [] | {} (the empty permission representing all objects)
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# permission -> ['AND', permission, …]
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# -> ['OR', permission, …]
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# -> ['NOT', permission]
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# permission -> {key: value, …}
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# key -> string
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# value -> int | string | bool | null
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# -> [parameter]
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# query -> [] | {} (the empty query representing all objects)
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# query -> ['AND', query, …]
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# -> ['OR', query, …]
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# -> ['NOT', query]
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# query -> {key: value, …}
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# key -> string
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# value -> int | string | bool | null
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# -> [parameter]
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#
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# Examples:
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# Q(is_admin=True) := {'is_admin': ['TYPE', 'bool', 'True']}
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# ~Q(is_admin=True) := ['NOT', {'is_admin': ['TYPE', 'bool', 'True']}]
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permission = models.TextField()
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query = models.TextField()
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type = models.CharField(max_length=16, choices=PERMISSION_TYPES)
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type = models.CharField(max_length=15, choices=PERMISSION_TYPES)
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field = models.CharField(max_length=256, blank=True)
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field = models.CharField(max_length=255, blank=True)
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description = models.CharField(max_length=255, blank=True)
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class Meta:
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unique_together = ('model', 'permission', 'type', 'field')
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unique_together = ('model', 'query', 'type', 'field')
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def clean(self):
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if self.field and self.type not in {'view', 'change'}:
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@ -86,25 +88,25 @@ class Permission(models.Model):
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self.full_clean()
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super().save()
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def _about(_self, _permission, **kwargs):
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def _about(_self, _query, **kwargs):
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self = _self
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permission = _permission
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if len(permission) == 0:
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# The permission is either [] or {} and
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query = _query
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if len(query) == 0:
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# The query is either [] or {} and
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# applies to all objects of the model
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# to represent this we return None
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return None
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if isinstance(permission, list):
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if permission[0] == 'AND':
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return functools.reduce(operator.and_, [self._about(permission, **kwargs) for permission in permission[1:]])
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elif permission[0] == 'OR':
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return functools.reduce(operator.or_, [self._about(permission, **kwargs) for permission in permission[1:]])
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elif permission[0] == 'NOT':
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return ~self._about(permission[1], **kwargs)
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elif isinstance(permission, dict):
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if isinstance(query, list):
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if query[0] == 'AND':
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return functools.reduce(operator.and_, [self._about(query, **kwargs) for query in query[1:]])
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elif query[0] == 'OR':
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return functools.reduce(operator.or_, [self._about(query, **kwargs) for query in query[1:]])
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elif query[0] == 'NOT':
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return ~self._about(query[1], **kwargs)
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elif isinstance(query, dict):
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q_kwargs = {}
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for key in permission:
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value = permission[key]
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for key in query:
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value = query[key]
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if isinstance(value, list):
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# It is a parameter we query its primary key
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q_kwargs[key] = kwargs[value[0]].pk
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@ -113,18 +115,22 @@ class Permission(models.Model):
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return Q(**q_kwargs)
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else:
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# TODO: find a better way to crash here
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raise Exception("Permission {} is wrong".format(self.permission))
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raise Exception("query {} is wrong".format(self.query))
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def about(self, **kwargs):
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permission = json.loads(self.permission)
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query = self._about(permission, **kwargs)
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"""
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Return an InstancedPermission with the parameters
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replaced by their values and the query interpreted
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"""
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query = json.loads(self.query)
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query = self._about(query, **kwargs)
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return InstancedPermission(self.model, query, self.type, self.field)
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def __str__(self):
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if self.field:
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return _("Can {type} {model}.{field} in {permission}").format(type=self.type, model=self.model, field=self.field, permission=self.permission)
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return _("Can {type} {model}.{field} in {query}").format(type=self.type, model=self.model, field=self.field, query=self.query)
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else:
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return _("Can {type} {model} in {permission}").format(type=self.type, model=self.model, permission=self.permission)
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return _("Can {type} {model} in {query}").format(type=self.type, model=self.model, query=self.query)
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class UserPermission(models.Model):
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