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from __future__ import annotations
import json
import time
from pathlib import Path
import httpx
import jwt
from app.config import settings
class APNSClient:
def __init__(self) -> None:
self._key_text = Path(settings.apns_private_key_path).read_text()
self._token_cache: tuple[str, int] | None = None
self._client = httpx.AsyncClient(http2=True, timeout=10.0)
async def aclose(self) -> None:
await self._client.aclose()
def _bearer_token(self) -> str:
now = int(time.time())
if self._token_cache and now - self._token_cache[1] < 3000:
return self._token_cache[0]
token = jwt.encode(
{"iss": settings.apns_team_id, "iat": now},
self._key_text,
algorithm="ES256",
headers={"kid": settings.apns_key_id},
)
self._token_cache = (token, now)
return token
async def send_alert(
self,
*,
device_token: str,
apns_env: str,
topic: str,
title: str,
body: str,
payload: dict,
) -> tuple[bool, str | None, str | None]:
host = "https://api.push.apple.com" if apns_env == "production" else "https://api.sandbox.push.apple.com"
url = f"{host}/3/device/{device_token}"
merged_payload = {
"aps": {
"alert": {"title": title, "body": body},
"sound": "default",
},
**payload,
}
response = await self._client.post(
url,
headers={
"authorization": f"bearer {self._bearer_token()}",
"apns-topic": topic,
"apns-push-type": "alert",
"apns-priority": "10",
},
content=json.dumps(merged_payload).encode("utf-8"),
)
apns_id = response.headers.get("apns-id")
if 200 <= response.status_code < 300:
return True, apns_id, None
error = None
try:
error = response.json().get("reason")
except Exception:
error = response.text
return False, apns_id, error
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