"""S3 common functions."""

import boto3
import botocore

from src import config

client = boto3.client('s3')
resource = boto3.resource('s3')


def object_exists(bucket, key):
    """Check if S3 object exists.

    Args:
        bucket (str): target S3 bucket.
        key (str): target S3 key.
    """
    try:
        client.head_object(
            Bucket=bucket,
            Key=key,
            ExpectedBucketOwner=config.EXPECTED_BUCKET_OWNER
        )
    except botocore.exceptions.ClientError as e:
        if e.response['Error']['Code'] == '404':
            return False
        else:
            raise
    else:
        return True