feat: 双Token认证(Access 2h/Refresh 7d) + 通知系统(转交/驳回自动推送)

backend/app/core/security.py

@@ -1,4 +1,4 @@
-"""安全模块 — JWT Token 生成与验证"""
+"""安全模块 — JWT Token 生成与验证（双 Token 架构）"""
 from datetime import timedelta
 from jose import JWTError, jwt
 from passlib.context import CryptContext
@@ -9,17 +9,36 @@ pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
 
 ALGORITHM = "HS256"
 
+# Token 类型声明
+TOKEN_TYPE_ACCESS = "access"
+TOKEN_TYPE_REFRESH = "refresh"
+
 
 def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
-    """生成 JWT Access Token"""
+    """生成 JWT Access Token（2 小时有效）"""
     to_encode = data.copy()
     expire = get_beijing_time() + (
         expires_delta or timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
     )
-    to_encode.update({"exp": expire})
+    to_encode.update({"exp": expire, "type": TOKEN_TYPE_ACCESS})
     return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
 
 
+def create_refresh_token(data: dict, expires_delta: timedelta | None = None) -> str:
+    """生成 JWT Refresh Token（7 天有效，仅用于刷新 Access Token）"""
+    to_encode = data.copy()
+    expire = get_beijing_time() + (
+        expires_delta or timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
+    )
+    to_encode.update({"exp": expire, "type": TOKEN_TYPE_REFRESH})
+    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
+
+
+def decode_token(token: str) -> dict:
+    """解码并验证 JWT Token，返回 payload"""
+    return jwt.decode(token, settings.SECRET_KEY, algorithms=[ALGORITHM])
+
+
 def verify_password(plain_password: str, hashed_password: str) -> bool:
     """验证明文密码 vs 哈希密码"""
     return pwd_context.verify(plain_password, hashed_password)