add user management system

backend/app/core/security.py

@@ -0,0 +1,26 @@
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import jwt
+from passlib.context import CryptContext
+
+SECRET_KEY = "your-super-secret-key-for-dataclaw"  # In production, use env variable
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30 * 24 * 60  # 30 days
+
+pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")
+
+def verify_password(plain_password, hashed_password):
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password):
+    return pwd_context.hash(password)
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt