add files integrity periodic check

from django.conf import settings

from django.urls import reverse

from django.utils import timezone

from django.db import connection

from resources import models

from PIL import Image

import os

import time

import shutil

import hashlib

from PIL import UnidentifiedImageError

from PIL.Image import DecompressionBombError

            logger.warning(f"can't identify {file.pk}")

        except DecompressionBombError:

            logger.warning(f"can't decompress {file.pk}")

@db_periodic_task(crontab(day="*/7"))

def check_files_integrity():

    def file_hash256(file_path: str) -> str:

        try:

            hsh = hashlib.sha256()

            with open(file_path, "rb") as f:

                for chnk in iter(lambda: f.read(8192), b""):

                    hsh.update(chnk)

            return hsh.hexdigest()

        except FileNotFoundError:

            return ""

    cursor = connection.cursor()

    cursor.execute(

        "select hash, resource_ptr_id from resources_file where resources_file.tiled = false order by resource_ptr_id"

    )

    for row in cursor.fetchall():

        new_hash = file_hash256(models.hash_to_local_path(row[0]))

        if new_hash != row[0]:

            logger.warning(f"FILE INTEGRITY CHECK FAILED. File id: {row[1]}")

    connection.close()