backend/core/security.py

from datetime import datetime, timedelta
from typing import Any
from jose import jwt, JWTError
from passlib.context import CryptContext
from backend.config import settings

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def create_access_token(data: dict[str, Any], expires_delta: timedelta | None = None) -> str:
    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 verify_token(token: str) -> dict[str, Any] | None:
    try:
        payload = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
        return payload
    except JWTError:
        return None


def create_refresh_token(data: dict[str, Any], expires_delta: timedelta | None = None) -> str:
    """Create a refresh token with longer expiry and different secret."""
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(days=settings.refresh_token_expire_days)
    to_encode.update({"exp": expire, "type": "refresh"})
    encoded_jwt = jwt.encode(to_encode, settings.refresh_secret_key, algorithm=settings.algorithm)
    return encoded_jwt


def verify_refresh_token(token: str) -> dict[str, Any] | None:
    """Verify a refresh token using the refresh secret key."""
    try:
        payload = jwt.decode(token, settings.refresh_secret_key, algorithms=[settings.algorithm])
        if payload.get("type") != "refresh":
            return None
        return payload
    except JWTError:
        return None


def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    return pwd_context.hash(password)