Cloud One File Storage Securityを使ったスキャンで検知した時にメール通知したい

import json
import boto3
import re
import urllib.parse

sns_client = boto3.client('sns')
topic_arn = "arn:aws:sns:ap-northeast-1:【AWSアカウントID】:xxxxxxxx"

S3_DOMAIN_PATTERN = 's3(\..+)?\.amazonaws.com'

def parse_s3_object_url(url_string):
    url = urllib.parse.urlparse(url_string)

    if re.fullmatch(S3_DOMAIN_PATTERN, url.netloc):
        bucket = url.path.split('/')[1]
        s3_object = '/'.join(url.path.split('/')[2:])
    else:
        bucket = url.netloc.split('.')[0]
        s3_object = url.path[1:]
    object_key = urllib.parse.unquote_plus(s3_object)

    return bucket, object_key

def lambda_handler(event, context):
    for record in event['Records']:
        message = json.loads(record['Sns']['Message'])

        if message['scanner_status'] != 0:
            print('Skip: ', message['scanner_status_message'])
            continue
        
        src_bucket, object_key = parse_s3_object_url(message['file_url'])

        scanning_result = message['scanning_result']
        findings = scanning_result.get('Findings')

        if findings:
            mail_title = "[testC1FSS] 検知しました"
            message = f"検知しました。\nバケット名: {src_bucket}\nファイル名: {object_key}\n"
            for fd in findings:
                malware = fd.get('malware')
                type = fd.get('type')
                message += f"malware: {malware}\ntype: {type}\n"

            mail = sns_client.publish(
                    TopicArn=topic_arn,
                    Subject=mail_title,    
                    Message=message
                    )

    return {
        'statusCode': 200
    }

※コード内7行目の「topic_arn」は手順「SNSトピック作成」で作成したものに書き換えます。