src/comfyui/custom_nodes/ComfyUI-Helper-Nodes/_image_util.py

from datetime import datetime, timezone
import hashlib


def make_pathname(filename: str, seed: int, modelname: str, counter: int, time_format: str):
    filename = filename.replace("%date", get_timestamp("%Y-%m-%d"))
    filename = filename.replace("%time", get_timestamp(time_format))
    filename = filename.replace("%model", modelname)
    filename = filename.replace("%seed", str(seed))
    filename = filename.replace("%counter", str(counter))
    return filename


def make_filename(filename: str, seed, modelname, counter, time_format):
    filename = make_pathname(filename, seed, modelname, counter, time_format)

    return get_timestamp(time_format) if filename == "" else filename


def parse_name(ckpt_name):
    path = ckpt_name
    filename = path.split("/")[-1]
    filename = filename.split(".")[:-1]
    filename = ".".join(filename)
    return filename


def get_timestamp(time_format):
    now = datetime.now(tz=timezone.utc)
    try:
        timestamp = now.strftime(time_format)
    except:
        timestamp = now.strftime("%Y-%m-%d-%H%M%SUTC")

    return timestamp


def calculate_sha256(file_path):
    sha256_hash = hashlib.sha256()

    with open(file_path, "rb") as f:
        # Read the file in chunks to avoid loading the entire file into memory
        for byte_block in iter(lambda: f.read(4096), b""):
            sha256_hash.update(byte_block)

    return sha256_hash.hexdigest()


def handle_whitespace(string: str):
    return string.strip().replace("\n", " ").replace("\r", " ").replace("\t", " ")