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TradeFlow AI — CEISA 4.0 OAuth 2.0 Token Manager (T-050)
Manages the OAuth 2.0 client_credentials token lifecycle for CEISA H2H.
- Acquires token on first use
- Caches in Redis with TTL = expires_in - 60s (safety margin)
- Transparently refreshes on expiry
PRD: No bare os.getenv() — all config from settings.
"""
from __future__ import annotations
import logging
from typing import Any
import httpx
logger = logging.getLogger("services.ceisa_auth")
_REDIS_KEY = "ceisa:oauth_token"
class CEISAAuthClient:
"""Thread-safe CEISA OAuth 2.0 token manager backed by Redis."""
def __init__(self, settings: Any) -> None:
self._settings = settings
self._redis_url = settings.REDIS_URL
async def _get_redis(self):
import redis.asyncio as aioredis
return await aioredis.from_url(self._redis_url, decode_responses=True)
async def get_access_token(self) -> str:
"""Return a valid access token, acquiring a new one if needed."""
r = await self._get_redis()
try:
token = await r.get(_REDIS_KEY)
if token:
return token
finally:
await r.aclose()
return await self._acquire_token()
async def _acquire_token(self) -> str:
"""Acquire a new token from CEISA OAuth endpoint and cache in Redis."""
token_url = f"{self._settings.CEISA_BASE_URL.rstrip('/')}/auth/token"
try:
async with httpx.AsyncClient(timeout=15.0) as client:
resp = await client.post(
token_url,
data={
"grant_type": "client_credentials",
"client_id": self._settings.CEISA_CLIENT_ID,
"client_secret": self._settings.CEISA_CLIENT_SECRET.get_secret_value(),
},
)
resp.raise_for_status()
data = resp.json()
except httpx.HTTPStatusError as e:
logger.error(f"CEISA token acquisition failed: {e.response.status_code}")
raise
except Exception as e:
logger.error(f"CEISA token endpoint unreachable: {e}")
raise
token = data.get("access_token")
expires_in = int(data.get("expires_in", 3600))
ttl = max(expires_in - 60, 60) # safety margin
r = await self._get_redis()
try:
await r.setex(_REDIS_KEY, ttl, token)
finally:
await r.aclose()
logger.info(f"CEISA access token acquired, TTL={ttl}s")
return token
async def invalidate(self) -> None:
"""Force token invalidation (e.g., after 401 response)."""
r = await self._get_redis()
try:
await r.delete(_REDIS_KEY)
finally:
await r.aclose()
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