sso-oidc exceptions don't translate "error_description" into ClientError message field

[benkehoe]

The sso-oidc method CreateToken returns an error response that looks like:

{"error": "invalid_grant", "error_description": "Invalid grant provided"}

but on the botocore.errorfactory.InvalidGrantException object, the error.response["Error"]["Code"] is correct but error.response["Error"]["Message"] is an empty string.

This is using botocore 1.19.13

[swetashre]

@benkehoe - Thank you for your post. While parsing a service response we expect the service to send error message with message attribute
https://github.com/boto/botocore/blob/develop/botocore/parsers.py#L638

But in this case as the service is sending error_description instead of message, botocore is not able to parse that. Marking it as feature request.

[benkehoe]

Thanks. Seems like it should be part of the response shape. In this case, the error_description field is required by the OAuth spec: https://tools.ietf.org/html/rfc6749#section-5.2

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