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"""For a given resources, classes in the module intend to create the following
routes :
GET resource/<id>
-> to retrieve one
POST resource
-> to create one
PUT resource/<id>
-> to update one
DELETE resource/<id>
-> to delete one
GET resources
-> to retrieve several
POST resources
-> to create several
PUT resources
-> to update several
DELETE resources
-> to delete several
"""
import ast
import logging
from functools import wraps
from werkzeug.exceptions import Unauthorized, BadRequest, Forbidden, NotFound
from flask import request
from flask_restful import Resource, reqparse
from flask_login import current_user
from web.views.common import admin_permission, api_permission, \
login_user_bundle, jsonify
from web.controllers import UserController
logger = logging.getLogger(__name__)
def authenticate(func):
@wraps(func)
def wrapper(*args, **kwargs):
if request.authorization:
ucontr = UserController()
try:
user = ucontr.get(nickname=request.authorization.username)
except NotFound:
raise Forbidden("Couldn't authenticate your user")
if not ucontr.check_password(user, request.authorization.password):
raise Forbidden("Couldn't authenticate your user")
if not user.is_active:
raise Forbidden("User is deactivated")
login_user_bundle(user)
if current_user.is_authenticated:
return func(*args, **kwargs)
raise Unauthorized()
return wrapper
class PyAggAbstractResource(Resource):
method_decorators = [authenticate, jsonify]
controller_cls = None
attrs = None
@property
def controller(self):
if admin_permission.can():
return self.controller_cls()
return self.controller_cls(current_user.id)
def reqparse_args(self, right, req=None, strict=False, default=True,
allow_empty=False):
"""
strict: bool
if True will throw 400 error if args are defined and not in request
default: bool
if True, won't return defaults
args: dict
the args to parse, if None, self.attrs will be used
"""
try:
if req:
in_values = req.json
else:
in_values = request.args or request.json or {}
if not in_values and allow_empty:
return {}
except BadRequest:
if allow_empty:
return {}
raise
parser = reqparse.RequestParser()
if self.attrs is not None:
attrs = self.attrs
elif admin_permission.can():
attrs = self.controller_cls._get_attrs_desc('admin')
elif api_permission.can():
attrs = self.controller_cls._get_attrs_desc('api', right)
else:
attrs = self.controller_cls._get_attrs_desc('base', right)
assert attrs, "No defined attrs for %s" % self.__class__.__name__
for attr_name, attr in attrs.items():
if not default and attr_name not in in_values:
continue
else:
parser.add_argument(attr_name, location='json',
default=in_values[attr_name])
return parser.parse_args(req=request.args, strict=strict)
class PyAggResourceNew(PyAggAbstractResource):
@api_permission.require(http_exception=403)
def post(self):
"""Create a single new object"""
return self.controller.create(**self.reqparse_args(right='write')), 201
class PyAggResourceExisting(PyAggAbstractResource):
def get(self, obj_id=None):
"""Retrieve a single object"""
return self.controller.get(id=obj_id)
def put(self, obj_id=None):
"""update an object, new attrs should be passed in the payload"""
args = self.reqparse_args(right='write', default=False)
if not args:
raise BadRequest()
return self.controller.update({'id': obj_id}, args), 200
def delete(self, obj_id=None):
"""delete a object"""
self.controller.delete(obj_id)
return None, 204
class PyAggResourceMulti(PyAggAbstractResource):
def get(self):
"""retrieve several objects. filters can be set in the payload on the
different fields of the object, and a limit can be set in there as well
"""
args = {}
try:
limit = request.json.pop('limit', 10)
order_by = request.json.pop('order_by', None)
except Exception:
args = self.reqparse_args(right='read', default=False)
limit = request.args.get('limit', 10)
order_by = request.args.get('order_by', None)
query = self.controller.read(**args)
if order_by:
query = query.order_by(order_by)
if limit:
query = query.limit(limit)
return [res for res in query]
@api_permission.require(http_exception=403)
def post(self):
"""creating several objects. payload should be:
>>> payload
[{attr1: val1, attr2: val2}, {attr1: val1, attr2: val2}]
"""
status, fail_count, results = 200, 0, []
class Proxy:
pass
for attrs in request.json:
try:
Proxy.json = attrs
args = self.reqparse_args('write', req=Proxy, default=False)
obj = self.controller.create(**args)
results.append(obj)
except Exception as error:
fail_count += 1
results.append(str(error))
if fail_count == len(results): # all failed => 500
status = 500
elif fail_count: # some failed => 206
status = 206
return results, status
def put(self):
"""updating several objects. payload should be:
>>> payload
[[obj_id1, {attr1: val1, attr2: val2}]
[obj_id2, {attr1: val1, attr2: val2}]]
"""
status, results = 200, []
class Proxy:
pass
for obj_id, attrs in request.json:
try:
Proxy.json = attrs
args = self.reqparse_args('write', req=Proxy, default=False)
result = self.controller.update({'id': obj_id}, args)
if result:
results.append('ok')
else:
results.append('nok')
except Exception as error:
results.append(str(error))
if results.count('ok') == 0: # all failed => 500
status = 500
elif results.count('ok') != len(results): # some failed => 206
status = 206
return results, status
def delete(self):
"""will delete several objects,
a list of their ids should be in the payload"""
status, results = 204, []
for obj_id in request.json:
try:
self.controller.delete(obj_id)
results.append('ok')
except Exception as error:
status = 206
results.append(error)
# if no operation succeeded, it's not partial anymore, returning err 500
if status == 206 and results.count('ok') == 0:
status = 500
return results, status
|
