İlk commit: Stepstead backend (FastAPI)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

security.py

@@ -0,0 +1,40 @@
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+import bcrypt
+import jwt
+
+from config import settings
+
+BCRYPT_ROUNDS = 12
+
+
+def _truncate(pw: str) -> bytes:
+    return pw.encode("utf-8")[:72]
+
+
+def hash_password(password: str) -> str:
+    return bcrypt.hashpw(_truncate(password), bcrypt.gensalt(rounds=BCRYPT_ROUNDS)).decode()
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    try:
+        return bcrypt.checkpw(_truncate(plain), hashed.encode())
+    except (ValueError, TypeError):
+        return False
+
+
+def create_access_token(subject: str | int, extra: Optional[dict] = None) -> str:
+    now = datetime.now(timezone.utc)
+    payload = {
+        "sub": str(subject),
+        "iat": int(now.timestamp()),
+        "exp": int((now + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)).timestamp()),
+    }
+    if extra:
+        payload.update(extra)
+    return jwt.encode(payload, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+
+
+def decode_token(token: str) -> dict:
+    return jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])