bazarr/libs/flask_restx/namespace.py

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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import inspect
import warnings
import logging
from collections import namedtuple, OrderedDict
import six
from flask import request
from flask.views import http_method_funcs
from ._http import HTTPStatus
from .errors import abort
from .marshalling import marshal, marshal_with
from .model import Model, OrderedModel, SchemaModel
from .reqparse import RequestParser
from .utils import merge
# Container for each route applied to a Resource using @ns.route decorator
ResourceRoute = namedtuple("ResourceRoute", "resource urls route_doc kwargs")
class Namespace(object):
"""
Group resources together.
Namespace is to API what :class:`flask:flask.Blueprint` is for :class:`flask:flask.Flask`.
:param str name: The namespace name
:param str description: An optional short description
:param str path: An optional prefix path. If not provided, prefix is ``/+name``
:param list decorators: A list of decorators to apply to each resources
:param bool validate: Whether or not to perform validation on this namespace
:param bool ordered: Whether or not to preserve order on models and marshalling
:param Api api: an optional API to attache to the namespace
"""
def __init__(
self,
name,
description=None,
path=None,
decorators=None,
validate=None,
authorizations=None,
ordered=False,
**kwargs
):
self.name = name
self.description = description
self._path = path
self._schema = None
self._validate = validate
self.models = {}
self.urls = {}
self.decorators = decorators if decorators else []
self.resources = [] # List[ResourceRoute]
self.error_handlers = OrderedDict()
self.default_error_handler = None
self.authorizations = authorizations
self.ordered = ordered
self.apis = []
if "api" in kwargs:
self.apis.append(kwargs["api"])
self.logger = logging.getLogger(__name__ + "." + self.name)
@property
def path(self):
return (self._path or ("/" + self.name)).rstrip("/")
def add_resource(self, resource, *urls, **kwargs):
"""
Register a Resource for a given API Namespace
:param Resource resource: the resource ro register
:param str urls: one or more url routes to match for the resource,
standard flask routing rules apply.
Any url variables will be passed to the resource method as args.
:param str endpoint: endpoint name (defaults to :meth:`Resource.__name__.lower`
Can be used to reference this route in :class:`fields.Url` fields
:param list|tuple resource_class_args: args to be forwarded to the constructor of the resource.
:param dict resource_class_kwargs: kwargs to be forwarded to the constructor of the resource.
Additional keyword arguments not specified above will be passed as-is
to :meth:`flask.Flask.add_url_rule`.
Examples::
namespace.add_resource(HelloWorld, '/', '/hello')
namespace.add_resource(Foo, '/foo', endpoint="foo")
namespace.add_resource(FooSpecial, '/special/foo', endpoint="foo")
"""
route_doc = kwargs.pop("route_doc", {})
self.resources.append(ResourceRoute(resource, urls, route_doc, kwargs))
for api in self.apis:
ns_urls = api.ns_urls(self, urls)
api.register_resource(self, resource, *ns_urls, **kwargs)
def route(self, *urls, **kwargs):
"""
A decorator to route resources.
"""
def wrapper(cls):
doc = kwargs.pop("doc", None)
if doc is not None:
# build api doc intended only for this route
kwargs["route_doc"] = self._build_doc(cls, doc)
self.add_resource(cls, *urls, **kwargs)
return cls
return wrapper
def _build_doc(self, cls, doc):
if doc is False:
return False
unshortcut_params_description(doc)
handle_deprecations(doc)
for http_method in http_method_funcs:
if http_method in doc:
if doc[http_method] is False:
continue
unshortcut_params_description(doc[http_method])
handle_deprecations(doc[http_method])
if "expect" in doc[http_method] and not isinstance(
doc[http_method]["expect"], (list, tuple)
):
doc[http_method]["expect"] = [doc[http_method]["expect"]]
return merge(getattr(cls, "__apidoc__", {}), doc)
def doc(self, shortcut=None, **kwargs):
"""A decorator to add some api documentation to the decorated object"""
if isinstance(shortcut, six.text_type):
kwargs["id"] = shortcut
show = shortcut if isinstance(shortcut, bool) else True
def wrapper(documented):
documented.__apidoc__ = self._build_doc(
documented, kwargs if show else False
)
return documented
return wrapper
def hide(self, func):
"""A decorator to hide a resource or a method from specifications"""
return self.doc(False)(func)
def abort(self, *args, **kwargs):
"""
Properly abort the current request
See: :func:`~flask_restx.errors.abort`
"""
abort(*args, **kwargs)
def add_model(self, name, definition):
self.models[name] = definition
for api in self.apis:
api.models[name] = definition
return definition
def model(self, name=None, model=None, mask=None, strict=False, **kwargs):
"""
Register a model
:param bool strict - should model validation raise error when non-specified param
is provided?
.. seealso:: :class:`Model`
"""
cls = OrderedModel if self.ordered else Model
model = cls(name, model, mask=mask, strict=strict)
model.__apidoc__.update(kwargs)
return self.add_model(name, model)
def schema_model(self, name=None, schema=None):
"""
Register a model
.. seealso:: :class:`Model`
"""
model = SchemaModel(name, schema)
return self.add_model(name, model)
def extend(self, name, parent, fields):
"""
Extend a model (Duplicate all fields)
:deprecated: since 0.9. Use :meth:`clone` instead
"""
if isinstance(parent, list):
parents = parent + [fields]
model = Model.extend(name, *parents)
else:
model = Model.extend(name, parent, fields)
return self.add_model(name, model)
def clone(self, name, *specs):
"""
Clone a model (Duplicate all fields)
:param str name: the resulting model name
:param specs: a list of models from which to clone the fields
.. seealso:: :meth:`Model.clone`
"""
model = Model.clone(name, *specs)
return self.add_model(name, model)
def inherit(self, name, *specs):
"""
Inherit a model (use the Swagger composition pattern aka. allOf)
.. seealso:: :meth:`Model.inherit`
"""
model = Model.inherit(name, *specs)
return self.add_model(name, model)
def expect(self, *inputs, **kwargs):
"""
A decorator to Specify the expected input model
:param ModelBase|Parse inputs: An expect model or request parser
:param bool validate: whether to perform validation or not
"""
expect = []
params = {"validate": kwargs.get("validate", self._validate), "expect": expect}
for param in inputs:
expect.append(param)
return self.doc(**params)
def parser(self):
"""Instanciate a :class:`~RequestParser`"""
return RequestParser()
def as_list(self, field):
"""Allow to specify nested lists for documentation"""
field.__apidoc__ = merge(getattr(field, "__apidoc__", {}), {"as_list": True})
return field
def marshal_with(
self, fields, as_list=False, code=HTTPStatus.OK, description=None, **kwargs
):
"""
A decorator specifying the fields to use for serialization.
:param bool as_list: Indicate that the return type is a list (for the documentation)
:param int code: Optionally give the expected HTTP response code if its different from 200
"""
def wrapper(func):
doc = {
"responses": {
str(code): (description, [fields], kwargs)
if as_list
else (description, fields, kwargs)
},
"__mask__": kwargs.get(
"mask", True
), # Mask values can't be determined outside app context
}
func.__apidoc__ = merge(getattr(func, "__apidoc__", {}), doc)
return marshal_with(fields, ordered=self.ordered, **kwargs)(func)
return wrapper
def marshal_list_with(self, fields, **kwargs):
"""A shortcut decorator for :meth:`~Api.marshal_with` with ``as_list=True``"""
return self.marshal_with(fields, True, **kwargs)
def marshal(self, *args, **kwargs):
"""A shortcut to the :func:`marshal` helper"""
return marshal(*args, **kwargs)
def errorhandler(self, exception):
"""A decorator to register an error handler for a given exception"""
if inspect.isclass(exception) and issubclass(exception, Exception):
# Register an error handler for a given exception
def wrapper(func):
self.error_handlers[exception] = func
return func
return wrapper
else:
# Register the default error handler
self.default_error_handler = exception
return exception
def param(self, name, description=None, _in="query", **kwargs):
"""
A decorator to specify one of the expected parameters
:param str name: the parameter name
:param str description: a small description
:param str _in: the parameter location `(query|header|formData|body|cookie)`
"""
param = kwargs
param["in"] = _in
param["description"] = description
return self.doc(params={name: param})
def response(self, code, description, model=None, **kwargs):
"""
A decorator to specify one of the expected responses
:param int code: the HTTP status code
:param str description: a small description about the response
:param ModelBase model: an optional response model
"""
return self.doc(responses={str(code): (description, model, kwargs)})
def header(self, name, description=None, **kwargs):
"""
A decorator to specify one of the expected headers
:param str name: the HTTP header name
:param str description: a description about the header
"""
header = {"description": description}
header.update(kwargs)
return self.doc(headers={name: header})
def produces(self, mimetypes):
"""A decorator to specify the MIME types the API can produce"""
return self.doc(produces=mimetypes)
def deprecated(self, func):
"""A decorator to mark a resource or a method as deprecated"""
return self.doc(deprecated=True)(func)
def vendor(self, *args, **kwargs):
"""
A decorator to expose vendor extensions.
Extensions can be submitted as dict or kwargs.
The ``x-`` prefix is optionnal and will be added if missing.
See: http://swagger.io/specification/#specification-extensions-128
"""
for arg in args:
kwargs.update(arg)
return self.doc(vendor=kwargs)
@property
def payload(self):
"""Store the input payload in the current request context"""
return request.get_json()
def unshortcut_params_description(data):
if "params" in data:
for name, description in six.iteritems(data["params"]):
if isinstance(description, six.string_types):
data["params"][name] = {"description": description}
def handle_deprecations(doc):
if "parser" in doc:
warnings.warn(
"The parser attribute is deprecated, use expect instead",
DeprecationWarning,
stacklevel=2,
)
doc["expect"] = doc.get("expect", []) + [doc.pop("parser")]
if "body" in doc:
warnings.warn(
"The body attribute is deprecated, use expect instead",
DeprecationWarning,
stacklevel=2,
)
doc["expect"] = doc.get("expect", []) + [doc.pop("body")]