How to incorporate a filter policy when subscribing to a topic using boto3 SNS?

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To incorporate a filter policy when subscribing to an SNS topic using boto3, you can use the subscribe() method of the boto3.client('sns') object and pass the optional parameter FilterPolicy in the form of a dictionary.

Here's an example code snippet that demonstrates how to subscribe to an SNS topic with a filter policy:

import boto3 client = boto3.client('sns') topic_arn = 'arn:aws:sns:us-east-1:123456789012:example-topic' protocol = 'email' endpoint = 'example@email.com' filter_policy = { 'eventType': ['order_created', 'order_updated'], 'productCategory': ['electronics', 'clothing'] } response = client.subscribe( TopicArn=topic_arn, Protocol=protocol, Endpoint=endpoint, Attributes={ 'FilterPolicy': json.dumps(filter_policy) } ) subscription_arn = response['SubscriptionArn'] print(f'Successfully subscribed to topic {topic_arn} with filter policy: {filter_policy}') 

In the example above, we first create an instance of the boto3.client('sns') object, and then specify the topic_arn of the SNS topic that we want to subscribe to, the protocol that we want to use (e.g. email, SMS, HTTPS, etc.), and the endpoint of the subscriber (e.g. email address, phone number, URL, etc.).

Next, we define the filter_policy parameter as a dictionary that contains the filter rules to apply to the messages sent to the topic. In this example, the filter policy specifies that we want to receive only messages that have the eventType attribute set to either 'order_created' or 'order_updated', and the productCategory attribute set to either 'electronics' or 'clothing'.

Finally, we pass the FilterPolicy parameter to the Attributes dictionary of the subscribe() method as a JSON-encoded string, and retrieve the subscription_arn of the subscription.

If the subscription is successful, the code will print a message indicating the topic and filter policy that we subscribed to.