File size: 11,367 Bytes
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import time
import uuid
import json
import jwt
from typing import Optional, Dict, Any, List
from threading import Lock
from backend.services.redis_lock import RedisLockManager
JWT_SECRET = os.getenv("JWT_SECRET", "hyperflow_enterprise_jwt_secret_key_2026")
JWT_ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "15"))
REFRESH_TOKEN_EXPIRE_DAYS = int(os.getenv("REFRESH_TOKEN_EXPIRE_DAYS", "7"))
class TokenManager:
"""
Enterprise Dual-Token & JTI Revocation Blacklist Manager.
Uses Redis for real-time O(1) blacklist lookups with TTL auto-purge.
Falls back gracefully to a thread-safe in-memory store if Redis is unavailable.
"""
def __init__(self, redis_client=None):
self.secret_key = JWT_SECRET
self.algorithm = JWT_ALGORITHM
self.lock_manager = RedisLockManager(redis_client=redis_client)
self.redis = getattr(self.lock_manager, 'client', None)
self.use_fallback = getattr(self.lock_manager, 'use_fallback', True)
# In-memory fallbacks when Redis is offline
self._memory_blacklist: Dict[str, float] = {} # {jti: exp_timestamp}
self._memory_user_jtis: Dict[str, List[tuple[str, float]]] = {} # {sub: [(jti, exp_timestamp)]}
self._mem_lock = Lock()
# ---------------------------------------------------------------------------
# Token Generation
# ---------------------------------------------------------------------------
def create_access_token(
self,
sub: str,
role: str = "user",
scopes: Optional[List[str]] = None,
custom_jti: Optional[str] = None
) -> tuple[str, str, float]:
"""Generates a short-lived access token (15 mins) with a unique JTI."""
now = time.time()
exp = now + (ACCESS_TOKEN_EXPIRE_MINUTES * 60)
jti = custom_jti or str(uuid.uuid4())
payload = {
"sub": sub,
"jti": jti,
"token_type": "access",
"role": role,
"scopes": scopes or ["read"],
"iat": int(now),
"exp": int(exp)
}
token = jwt.encode(payload, self.secret_key, algorithm=self.algorithm)
self.track_user_jti(sub, jti, exp)
return token, jti, exp
def create_refresh_token(
self,
sub: str,
role: str = "user",
parent_jti: Optional[str] = None,
custom_jti: Optional[str] = None
) -> tuple[str, str, float]:
"""Generates a long-lived refresh token (7 days) with a unique JTI."""
now = time.time()
exp = now + (REFRESH_TOKEN_EXPIRE_DAYS * 86400)
jti = custom_jti or str(uuid.uuid4())
payload = {
"sub": sub,
"jti": jti,
"token_type": "refresh",
"role": role,
"parent_jti": parent_jti,
"iat": int(now),
"exp": int(exp)
}
token = jwt.encode(payload, self.secret_key, algorithm=self.algorithm)
self.track_user_jti(sub, jti, exp)
return token, jti, exp
def issue_token_pair(
self,
sub: str,
role: str = "user",
scopes: Optional[List[str]] = None
) -> Dict[str, Any]:
"""Issues an Access + Refresh dual token pair."""
access_token, access_jti, access_exp = self.create_access_token(sub, role, scopes)
refresh_token, refresh_jti, refresh_exp = self.create_refresh_token(sub, role, parent_jti=access_jti)
return {
"access_token": access_token,
"refresh_token": refresh_token,
"token_type": "bearer",
"expires_in": ACCESS_TOKEN_EXPIRE_MINUTES * 60,
"access_jti": access_jti,
"refresh_jti": refresh_jti,
"access_exp": int(access_exp),
"refresh_exp": int(refresh_exp)
}
# ---------------------------------------------------------------------------
# Token Verification
# ---------------------------------------------------------------------------
def decode_token(self, token_str: str) -> Dict[str, Any]:
"""Decodes and validates token signature and expiration."""
try:
payload = jwt.decode(token_str, self.secret_key, algorithms=[self.algorithm])
return payload
except jwt.ExpiredSignatureError:
raise ValueError("Token signature has expired")
except jwt.InvalidTokenError as e:
raise ValueError(f"Invalid token: {str(e)}")
def verify_access_token(self, token_str: str) -> Dict[str, Any]:
"""Decodes access token and ensures it is valid, type=='access', and not blacklisted."""
payload = self.decode_token(token_str)
if payload.get("token_type") != "access":
raise ValueError("Invalid token type. Expected access token.")
jti = payload.get("jti")
if not jti:
raise ValueError("Token payload missing JTI identifier.")
if self.is_jti_blacklisted(jti):
raise ValueError("Access token has been revoked (blacklisted JTI).")
return payload
def verify_refresh_token(self, token_str: str) -> Dict[str, Any]:
"""Decodes refresh token and ensures type=='refresh' and not blacklisted."""
payload = self.decode_token(token_str)
if payload.get("token_type") != "refresh":
raise ValueError("Invalid token type. Expected refresh token.")
jti = payload.get("jti")
if not jti:
raise ValueError("Token payload missing JTI identifier.")
if self.is_jti_blacklisted(jti):
raise ValueError("Refresh token has been revoked (blacklisted JTI).")
return payload
# ---------------------------------------------------------------------------
# Redis JTI Blacklisting Engine
# ---------------------------------------------------------------------------
def revoke_jti(self, jti: str, exp_timestamp: float) -> bool:
"""
Blacklists a JTI in Redis with TTL set to remaining token lifetime.
Automatically deleted by Redis once token naturally expires.
"""
now = time.time()
remaining_ttl = int(exp_timestamp - now)
if remaining_ttl <= 0:
return True # Already naturally expired
if not self.use_fallback and self.redis:
try:
key = f"blacklist:jti:{jti}"
self.redis.set(key, "revoked", ex=remaining_ttl)
return True
except Exception as e:
print(f"[TokenManager] Redis error during revoke_jti: {e}. Using in-memory fallback.")
# Fallback to thread-safe in-memory store
with self._mem_lock:
self._memory_blacklist[jti] = exp_timestamp
self._purge_expired_memory_blacklist()
return True
def is_jti_blacklisted(self, jti: str) -> bool:
"""Checks whether a JTI exists in the Redis or in-memory blacklist."""
if not jti:
return False
if not self.use_fallback and self.redis:
try:
key = f"blacklist:jti:{jti}"
return bool(self.redis.exists(key))
except Exception as e:
print(f"[TokenManager] Redis error during is_jti_blacklisted: {e}. Using in-memory fallback.")
# Fallback check
now = time.time()
with self._mem_lock:
exp = self._memory_blacklist.get(jti)
if exp and exp > now:
return True
elif exp and exp <= now:
del self._memory_blacklist[jti]
return False
def get_jti_status(self, jti: str) -> Dict[str, Any]:
"""Returns details on whether a JTI is blacklisted and its remaining TTL."""
if not self.use_fallback and self.redis:
try:
key = f"blacklist:jti:{jti}"
ttl = self.redis.ttl(key)
is_blacklisted = ttl > 0 or self.redis.exists(key) == 1
return {
"jti": jti,
"is_blacklisted": is_blacklisted,
"ttl_seconds": max(0, ttl) if is_blacklisted else 0,
"storage": "redis"
}
except Exception:
pass
now = time.time()
with self._mem_lock:
exp = self._memory_blacklist.get(jti)
if exp and exp > now:
return {
"jti": jti,
"is_blacklisted": True,
"ttl_seconds": int(exp - now),
"storage": "in_memory"
}
return {
"jti": jti,
"is_blacklisted": False,
"ttl_seconds": 0,
"storage": "in_memory"
}
# ---------------------------------------------------------------------------
# Session Tracking & Mass Revocation
# ---------------------------------------------------------------------------
def track_user_jti(self, sub: str, jti: str, exp_timestamp: float):
"""Registers active JTI under user's session list for bulk logout capability."""
if not self.use_fallback and self.redis:
try:
user_key = f"user:{sub}:jtis"
val = json.dumps({"jti": jti, "exp": exp_timestamp})
self.redis.sadd(user_key, val)
# Keep user session set alive for 7 days
self.redis.expire(user_key, REFRESH_TOKEN_EXPIRE_DAYS * 86400)
return
except Exception:
pass
with self._mem_lock:
if sub not in self._memory_user_jtis:
self._memory_user_jtis[sub] = []
self._memory_user_jtis[sub].append((jti, exp_timestamp))
def revoke_all_user_jtis(self, sub: str) -> int:
"""Mass revokes all active JTIs for a specified user (Logout-All)."""
revoked_count = 0
now = time.time()
if not self.use_fallback and self.redis:
try:
user_key = f"user:{sub}:jtis"
members = self.redis.smembers(user_key)
for member in members:
try:
data = json.loads(member)
jti = data.get("jti")
exp = data.get("exp", now + 3600)
if jti and exp > now:
self.revoke_jti(jti, exp)
revoked_count += 1
except Exception:
continue
self.redis.delete(user_key)
return revoked_count
except Exception:
pass
with self._mem_lock:
jtis = self._memory_user_jtis.pop(sub, [])
for jti, exp in jtis:
if exp > now:
self._memory_blacklist[jti] = exp
revoked_count += 1
return revoked_count
def _purge_expired_memory_blacklist(self):
"""Internal helper to prune expired JTIs from memory dictionary."""
now = time.time()
expired = [jti for jti, exp in self._memory_blacklist.items() if exp <= now]
for jti in expired:
del self._memory_blacklist[jti]
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