#
#  Copyright 2021 The FATE Authors. All Rights Reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#
import functools
import json
from base64 import b64encode
from hmac import HMAC
from time import time
from urllib.parse import quote, urlencode
from uuid import uuid1

import requests

from fate_arch.common.base_utils import CustomJSONEncoder
from fate_flow.settings import CLIENT_AUTHENTICATION, HTTP_APP_KEY, HTTP_SECRET_KEY


requests.models.complexjson.dumps = functools.partial(json.dumps, cls=CustomJSONEncoder)


def request(**kwargs):
    sess = requests.Session()
    stream = kwargs.pop('stream', sess.stream)
    timeout = kwargs.pop('timeout', None)
    kwargs['headers'] = {k.replace('_', '-').upper(): v for k, v in kwargs.get('headers', {}).items()}
    prepped = requests.Request(**kwargs).prepare()

    if CLIENT_AUTHENTICATION and HTTP_APP_KEY and HTTP_SECRET_KEY:
        timestamp = str(round(time() * 1000))
        nonce = str(uuid1())
        signature = b64encode(HMAC(HTTP_SECRET_KEY.encode('ascii'), b'\n'.join([
            timestamp.encode('ascii'),
            nonce.encode('ascii'),
            HTTP_APP_KEY.encode('ascii'),
            prepped.path_url.encode('ascii'),
            prepped.body if kwargs.get('json') else b'',
            urlencode(sorted(kwargs['data'].items()), quote_via=quote, safe='-._~').encode('ascii')
            if kwargs.get('data') and isinstance(kwargs['data'], dict) else b'',
        ]), 'sha1').digest()).decode('ascii')

        prepped.headers.update({
            'TIMESTAMP': timestamp,
            'NONCE': nonce,
            'APP-KEY': HTTP_APP_KEY,
            'SIGNATURE': signature,
        })

    return sess.send(prepped, stream=stream, timeout=timeout)