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import json
import time
import urllib.error
import urllib.request
from abc import ABC, abstractmethod
from logging import getLogger
from typing import Optional

from defence360agent.contracts.config import Core
from defence360agent.contracts.messages import Message
from defence360agent.internals.iaid import (
    IndependentAgentIDAPI,
    IAIDTokenError,
)
from defence360agent.utils.json import ServerJSONEncoder
from defence360agent.api.server import API, APIError

logger = getLogger(__name__)


class BaseSendMessageAPI(API, ABC):
    URL = "/api/v2/send-message/{method}"

    @abstractmethod
    async def _send_request(self, message_method, headers, post_data) -> dict:
        pass  # pragma: no cover

    def check_response(self, result: dict) -> None:
        if "status" not in result:
            raise APIError("unexpected server response: {!r}".format(result))
        if result["status"] != "ok":
            raise APIError("server error: {}".format(result.get("msg")))

    async def send_data(self, method: str, post_data: bytes) -> None:
        try:
            token = await IndependentAgentIDAPI.get_token()
        except IAIDTokenError as e:
            raise APIError(f"IAID token error occurred {e}")
        headers = {
            "Content-Type": "application/json",
            "X-Auth": token,
        }
        result = await self._send_request(method, headers, post_data)
        self.check_response(result)


class SendMessageAPI(BaseSendMessageAPI):
    _SOCKET_TIMEOUT = Core.DEFAULT_SOCKET_TIMEOUT

    def __init__(self, rpm_ver: str, base_url: str = None, executor=None):
        self._executor = executor
        self.rpm_ver = rpm_ver
        self.product_name = ""
        self.server_id = None  # type: Optional[str]
        self.license = {}  # type: dict
        if base_url:
            self.base_url = base_url
        else:
            self.base_url = self._BASE_URL

    def set_product_name(self, product_name: str) -> None:
        self.product_name = product_name

    def set_server_id(self, server_id: Optional[str]) -> None:
        self.server_id = server_id

    def set_license(self, license: dict) -> None:
        self.license = license

    async def _send_request(self, message_method, headers, post_data):
        request = urllib.request.Request(
            self.base_url + self.URL.format(method=message_method),
            data=post_data,
            headers=headers,
            method="POST",
        )
        return await self.async_request(request, executor=self._executor)

    async def send_message(self, message: Message) -> None:
        # add message handling time if it does not exist, so that
        # the server does not depend on the time it was received
        if "timestamp" not in message:
            message["timestamp"] = time.time()

        data2send = {
            "payload": message.payload,
            "rpm_ver": self.rpm_ver,
            "message_id": message.message_id,
            "server_id": self.server_id,
            "name": self.product_name,
        }
        post_data = json.dumps(data2send, cls=ServerJSONEncoder).encode()
        await self.send_data(message.method, post_data)
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