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Validate integrity of Amazon SNS messages

Project description

Validate integrity of Amazon SNS messages.

  • Verifies cryptographic signature.
  • Checks signing certificate is hosted on an Amazon-controlled URL.
  • Requires message be no older than one hour, the maximum lifetime of an SNS message.

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Licence: MIT.

Quick start

$ pip install validatesns
import validatesns

# Raise validatesns.ValidationError if message is invalid.
validatesns.validate(decoded_json_message_from_sns)

Gotchas

The validate function downloads the signing certificate on every call. For performance reasons, it’s worth caching certificates - you can do this by passing in a get_certificate function.

This takes a url, and returns the certificate content. Your function could cache to the filesystem, a database, or wherever makes sense.

Project details


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