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path: root/src/web/views/api/v2/common.py
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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.ext.restful import Resource, reqparse
from flask.ext.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 desactivated")
            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:
            in_values = req.json if req else (request.args 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', **attr)
        return parser.parse_args(req=in_values, 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):
        """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(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 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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