初始版本

backend/app/core/security.py

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+"""
+安全相关功能：密码哈希、JWT 令牌等
+"""
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from .config import settings
+
+# 密码加密上下文
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def get_password_hash(password: str) -> str:
+    """生成密码哈希"""
+    return pwd_context.hash(password)
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """验证密码"""
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    """创建 JWT 访问令牌"""
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+def decode_access_token(token: str) -> Optional[dict]:
+    """解码 JWT 令牌"""
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+        return payload
+    except JWTError:
+        return None
+