[backend] feat: 添加密码和JWT工具函数

backend/src/utils/__init__.py

@@ -0,0 +1,9 @@
+from .password import hash_password, verify_password
+from .jwt import create_access_token, decode_access_token
+
+__all__ = [
+    "hash_password",
+    "verify_password",
+    "create_access_token",
+    "decode_access_token",
+]

backend/src/utils/jwt.py

@@ -0,0 +1,33 @@
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from config.settings import get_settings
+
+settings = get_settings()
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    """创建访问令牌"""
+    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]:
+    """解码访问令牌"""
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
+        )
+        return payload
+    except JWTError:
+        return None

backend/src/utils/password.py

@@ -0,0 +1,15 @@
+import bcrypt
+
+
+def hash_password(password: str) -> str:
+    """哈希密码"""
+    salt = bcrypt.gensalt(rounds=12)
+    hashed = bcrypt.hashpw(password.encode("utf-8"), salt)
+    return hashed.decode("utf-8")
+
+
+def verify_password(password: str, hashed_password: str) -> bool:
+    """验证密码"""
+    return bcrypt.checkpw(
+        password.encode("utf-8"), hashed_password.encode("utf-8")
+    )