46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
from aws_lambda_powertools import Logger
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from aws_lambda_powertools.utilities.data_classes import (
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EventBridgeEvent,
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event_source,
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)
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from aws_lambda_powertools.utilities.typing import LambdaContext
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from email_validator import EmailUndeliverableError, validate_email
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from layercake.dateutils import now
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from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair
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from boto3clients import dynamodb_client
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from config import USER_TABLE
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logger = Logger(__name__)
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dyn = DynamoDBPersistenceLayer(USER_TABLE, dynamodb_client)
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@event_source(data_class=EventBridgeEvent)
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@logger.inject_lambda_context
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def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
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new_image = event.detail['new_image']
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# Post-migration (users): rename `emails` to `EMAIL`
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email = new_image['sk'].removeprefix('emails#')
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return dyn.update_item(
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key=KeyPair(
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pk=new_image['id'],
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sk=new_image['sk'],
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),
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update_expr='SET mx_record_exists = :bool, \
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updated_at = :now',
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expr_attr_values={
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':bool': _mx_record_exists(email),
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':now': now(),
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},
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)
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def _mx_record_exists(email: str) -> bool:
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try:
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validate_email(email, check_deliverability=True)
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except EmailUndeliverableError:
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return False
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else:
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return True
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