#!/usr/bin/env python
# --coding:utf-8--

from http.server import BaseHTTPRequestHandler, HTTPServer
import json
from urllib import request
import hashlib
import base64
from Crypto.Cipher import AES

# from utils import get_tenant_access_token, isreciept
# from Function import *
# from Private import APP_VERIFICATION_TOKEN

APP_VERIFICATION_TOKEN = 'uKQQiOVMYg2cTgrjkyBmodrHTUaCXzG3'
APP_ID = 'cli_a115fe8b83f9100c'
APP_SECRET = 'yuSQenId0VfvwdZ3qL9wMd8FpCMEUL0u'
ENCRYPT_KEY = '4XfjcA5xou3pztBD4g5V7dgHtr0BBYDE'
EVENT_TYPE = ['im.message.receive_v1']


class  AESCipher(object):
    def __init__(self, key):
        self.bs = AES.block_size
        self.key=hashlib.sha256(AESCipher.str_to_bytes(key)).digest()
    @staticmethod
    def str_to_bytes(data):
        u_type = type(b"".decode('utf8'))
        if isinstance(data, u_type):
            return data.encode('utf8')
        return data
    @staticmethod
    def _unpad(s):
        return s[:-ord(s[len(s) - 1:])]
    def decrypt(self, enc):
        iv = enc[:AES.block_size]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return  self._unpad(cipher.decrypt(enc[AES.block_size:]))
    def decrypt_string(self, enc):
        enc = base64.b64decode(enc)
        return  self.decrypt(enc).decode('utf8')

def get_tenant_access_token():  # 获取token

    url = "https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal/"
    headers = {
        "Content-Type": "application/json"
    }
    req_body = {
        "app_id": APP_ID,
        "app_secret": APP_SECRET
    }

    data = bytes(json.dumps(req_body), encoding='utf8')
    req = request.Request(url=url, data=data, headers=headers, method='POST')
    try:
        response = request.urlopen(req)
    except Exception as e:
        print(e.read().decode())
        return ""

    rsp_body = response.read().decode('utf-8')
    rsp_dict = json.loads(rsp_body)
    code = rsp_dict.get("code", -1)
    if code != 0:
        print("get tenant_access_token error, code =", code)
        return ""
    return rsp_dict.get("tenant_access_token", "")


class RequestHandler(BaseHTTPRequestHandler):
    def do_POST(self):
        # 解析请求 body
        req_body = self.rfile.read(int(self.headers['content-length']))
        obj = json.loads(req_body.decode("utf-8"))
        cipher = AESCipher(ENCRYPT_KEY)
        obj = json.loads(cipher.decrypt_string(obj['encrypt']))
        print(req_body)
        print(obj)

        # 校验 verification token 是否匹配，token 不匹配说明该回调并非来自开发平台
        token = obj.get("token", "")
        if not token:
            token = obj.get('header', {}).get('token', '')
        if token != APP_VERIFICATION_TOKEN:
            print("verification token not match, token =", token)
            self.response("")
            return

        # 根据 type 处理不同类型事件
        type = obj.get("type", "")
        if not type:
            type = obj.get('header', {}).get('event_type')
        if "url_verification" == type:  # 验证请求 URL 是否有效
            self.handle_request_url_verify(obj)
        elif type in EVENT_TYPE:  # 事件回调
            # 获取事件内容和类型，并进行相应处理，此处只关注给机器人推送的消息事件
            event = obj.get("event")
            if event.get("message"):
                self.handle_message(event)
                return
        return

    def handle_request_url_verify(self, post_obj):
        # 原样返回 challenge 字段内容
        challenge = post_obj.get("challenge", "")
        rsp = {'challenge': challenge}
        self.response(json.dumps(rsp))
        return

    def handle_message(self, event):
        # 此处只处理 text 类型消息，其他类型消息忽略
        msg = event.get('message', {})
        msg_type = msg.get("message_type", "")
        if msg_type == "text":
            # 调用发消息 API 之前，先要获取 API 调用凭证：tenant_access_token
            access_token = get_tenant_access_token()
            if access_token == "":
                self.response("")
                return

            # 机器人回复收到的消息
            text = json.loads(msg.get('content')).get('text')
            if msg.get('chat_type') == 'group' and msg.get('mentions'):
                open_id = {"open_chat_id": msg.get("chat_id")}
                for mention in msg.get('mentions'):
                    text = text.replace(mention['key'], '')
                text = text.lstrip()
            else:
                open_id = {"open_id": event.get("sender", {}).get(
                    'sender_id', {}).get('open_id')}
            self.msg_compoment(access_token, open_id, text)
            self.response("")
            return
        elif msg_type == "image":
            self.response("")
            return

    def response(self, body):
        self.send_response(200)
        self.send_header('Content-Type', 'application/json')
        self.end_headers()
        self.wfile.write(body.encode())

    def send_message(self, token, open_id, text):
        url = "https://open.feishu.cn/open-apis/message/v4/send/"
        headers = {
            "Content-Type": "application/json",
            "Authorization": "Bearer " + token
        }
        req_body = {
            "msg_type": "text",
            "content": {
                "text": text
            }
        }
        req_body = dict(req_body, **open_id)  # 根据open_id判断返回域

        data = bytes(json.dumps(req_body), encoding='utf8')
        req = request.Request(url=url, data=data, headers=headers, method='POST')
        try:
            response = request.urlopen(req)
        except Exception as e:
            print(e.read().decode())
            return

        rsp_body = response.read().decode('utf-8')
        rsp_dict = json.loads(rsp_body)
        code = rsp_dict.get("code", -1)
        if code != 0:
            print("send message error, code = ", code, ", msg =", rsp_dict.get("msg", ""))

    def msg_compoment(self, token, open_id, text):
        self.send_message(token, open_id, text)

def run():
    port = 5000
    server_address = ('', port)
    httpd = HTTPServer(server_address, RequestHandler)
    print("start.....")
    httpd.serve_forever()


if __name__ == '__main__':
    run()