app/functions/s3_handler.py

import logging
import boto3
from botocore.exceptions import ClientError
import os

ACCESS_KEY_ID = os.environ.get("ACCESS_KEY_ID")
SECRET_ACCESS_KEY = os.environ.get("SECRET_ACCESS_KEY")

session = boto3.Session(ACCESS_KEY_ID, SECRET_ACCESS_KEY)

def upload_file(file_name, bucket, folder, object_name=None):
    # If S3 object_name was not specified, use file_name
    if object_name is None:
        object_name = os.path.basename(file_name)

    # Upload the file
    s3_client = session.client('s3')
    try:
        response = s3_client.upload_file(file_name, bucket, f"{folder}/"+object_name)
    except ClientError as e:
        logging.error(e)
        return False
    
    url = f'{os.environ.get("RESULT_URL")}{folder}/{object_name}'
    return url