rentman-clone/backend/app/core/security.py

"""Security helpers: password hashing and JWT token management."""

from datetime import datetime, timedelta, timezone
from typing import Any

import bcrypt
from jose import jwt

from app.core.config import settings


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Verify a plaintext password against a bcrypt hash."""
    return bcrypt.checkpw(
        plain_password.encode("utf-8"), hashed_password.encode("utf-8")
    )


def get_password_hash(password: str) -> str:
    """Hash a password using bcrypt."""
    return bcrypt.hashpw(password.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")


def create_access_token(
    subject: str | Any, expires_delta: timedelta | None = None
) -> str:
    """Create a short-lived JWT access token."""
    if expires_delta is None:
        expires_delta = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    now = datetime.now(timezone.utc)
    expire = now + expires_delta
    to_encode = {"exp": expire, "sub": str(subject), "iat": now, "type": "access"}
    return jwt.encode(
        to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM
    )


def create_refresh_token(
    subject: str | Any, expires_delta: timedelta | None = None
) -> str:
    """Create a long-lived JWT refresh token."""
    if expires_delta is None:
        expires_delta = timedelta(minutes=settings.REFRESH_TOKEN_EXPIRE_MINUTES)
    now = datetime.now(timezone.utc)
    expire = now + expires_delta
    to_encode = {"exp": expire, "sub": str(subject), "iat": now, "type": "refresh"}
    return jwt.encode(
        to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM
    )


def verify_token(token: str) -> dict:
    """Decode and verify a JWT token. Returns the payload dict."""
    return jwt.decode(
        token, settings.JWT_SECRET_KEY, algorithms=[settings.JWT_ALGORITHM]
    )