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#! /usr/bin/env python
# -*- coding: utf-8 -
"""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 json
import logging
import dateutil.parser
from functools import wraps
from werkzeug.exceptions import Unauthorized, BadRequest
from flask import request, g, session, Response
from flask.ext.restful import Resource, reqparse
from web.lib.utils import default_handler
from web.models import User
logger = logging.getLogger(__name__)
def authenticate(func):
"""
Decorator for the authentication to the web services.
"""
@wraps(func)
def wrapper(*args, **kwargs):
logged_in = False
if not getattr(func, 'authenticated', True):
logged_in = True
# authentication based on the session (already logged on the site)
elif 'email' in session or g.user.is_authenticated:
logged_in = True
else:
# authentication via HTTP only
auth = request.authorization
if auth is not None:
user = User.query.filter(
User.nickname == auth.username).first()
if user and user.check_password(auth.password) and user.enabled:
g.user = user
logged_in = True
if logged_in:
return func(*args, **kwargs)
raise Unauthorized({'WWWAuthenticate': 'Basic realm="Login Required"'})
return wrapper
def to_response(func):
"""Will cast results of func as a result, and try to extract
a status_code for the Response object"""
def wrapper(*args, **kwargs):
status_code = 200
result = func(*args, **kwargs)
if isinstance(result, Response):
return result
elif isinstance(result, tuple):
result, status_code = result
return Response(json.dumps(result, default=default_handler),
status=status_code)
return wrapper
class PyAggAbstractResource(Resource):
method_decorators = [authenticate, to_response]
attrs = {}
to_date = [] # list of fields to cast to datetime
def __init__(self, *args, **kwargs):
super(PyAggAbstractResource, self).__init__(*args, **kwargs)
@property
def controller(self):
return self.controller_cls(getattr(g.user, 'id', None))
@property
def wider_controller(self):
if g.user.is_admin():
return self.controller_cls()
return self.controller_cls(getattr(g.user, 'id', None))
def reqparse_args(self, req=None, strict=False, default=True, args=None):
"""
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
"""
parser = reqparse.RequestParser()
for attr_name, attrs in (args or self.attrs).items():
if attrs.pop('force_default', False):
parser.add_argument(attr_name, location='json', **attrs)
elif not default and (not request.json
or request.json and attr_name not in request.json):
continue
else:
parser.add_argument(attr_name, location='json', **attrs)
parsed = parser.parse_args(strict=strict) if req is None \
else parser.parse_args(req, strict=strict)
for field in self.to_date:
if parsed.get(field):
try:
parsed[field] = dateutil.parser.parse(parsed[field])
except Exception:
logger.exception('failed to parse %r', parsed[field])
return parsed
class PyAggResourceNew(PyAggAbstractResource):
def post(self):
"""Create a single new object"""
return self.controller.create(**self.reqparse_args()), 201
class PyAggResourceExisting(PyAggAbstractResource):
def get(self, obj_id=None):
"""Retreive 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(default=False)
new_values = {key: args[key] for key in
set(args).intersection(self.attrs)}
if 'user_id' in new_values and g.user.is_admin():
controller = self.wider_controller
else:
controller = self.controller
return controller.update({'id': obj_id}, new_values), 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
"""
try:
limit = request.json.pop('limit', 10)
order_by = request.json.pop('order_by', None)
query = self.controller.read(**request.json)
except:
args = {}
for k, v in request.args.items():
if k in self.attrs.keys():
if self.attrs[k]['type'] in [bool, int]:
args[k] = ast.literal_eval(v)
else:
args[k] = v
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]
def post(self):
"""creating several objects. payload should be a list of dict.
"""
if 'application/json' not in request.headers.get('Content-Type'):
raise BadRequest("Content-Type must be application/json")
status = 201
results = []
for attrs in request.json:
try:
results.append(self.controller.create(**attrs).id)
except Exception as error:
status = 206
results.append(str(error))
# if no operation succeded, it's not partial anymore, returning err 500
if status == 206 and results.count('ok') == 0:
status = 500
return results, status
def put(self):
"""creating several objects. payload should be:
>>> payload
[[obj_id1, {attr1: val1, attr2: val2}]
[obj_id2, {attr1: val1, attr2: val2}]]
"""
if 'application/json' not in request.headers.get('Content-Type'):
raise BadRequest("Content-Type must be application/json")
status = 200
results = []
for obj_id, attrs in request.json:
try:
new_values = {key: attrs[key] for key in
set(attrs).intersection(self.attrs)}
self.controller.update({'id': obj_id}, new_values)
results.append('ok')
except Exception as error:
status = 206
results.append(str(error))
# if no operation succeded, it's not partial anymore, returning err 500
if status == 206 and results.count('ok') == 0:
status = 500
return results, status
def delete(self):
"""will delete several objects,
a list of their ids should be in the payload"""
if 'application/json' not in request.headers.get('Content-Type'):
raise BadRequest("Content-Type must be application/json")
status = 204
results = []
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 succeded, it's not partial anymore, returning err 500
if status == 206 and results.count('ok') == 0:
status = 500
return results, status
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