given the name of the file generates a version 3 signed download url for the file

gen_v4_sign_urls.py

from botocore.client import Config
import boto3
def gen_url(key):
    """
    given the name of the file generates a signed download url for the file
    :param key: filename in s3
    :return: presigned URL that has AWS4-HMAC-SHA256
    """
    expTime = 86400
    
    s3 = boto3.resource(
        "s3", region_name=REGION, config=Config(signature_version="s3v4")
    )
    return s3.meta.client.generate_presigned_url(
        "get_object", Params={"Bucket": AIRFLOW_BUCKET, "Key": key}, ExpiresIn=expTime
    )