def lambda_handler()

in lambda-issuer-iotcore/main.py [0:0]

• 18 lines of code
• 7 McCabe index (conditional complexity)

def lambda_handler(event, context):
    csr = base64.b64decode(event['headers']['device-csr'])
    req = load_certificate_request( FILETYPE_PEM, csr )
    device_id = req.get_subject().CN
    response = provision_certificate( csr )
    region = context.invoked_function_arn.split(":")[3]
    account = context.invoked_function_arn.split(":")[4]

    # Send the certificate to AWS IoT. We assume the issuing CA has already
    # been registered.
    if response is None:
        return None

    certificate_body = response['certificatePem']
    certificate_arn = response['certificateArn']

    # Create the Thing object and attach to the deployed certificate

    response = deploy_thing( device_id, certificate_arn )

    # The entire transaction failed, so report failure.
    if ( response == False ):
        return None

    # Create the Policy if necessary, and attach the created Policy (or
    # existing Policy) to the Thing.

    deploy_policy( certificate_arn, region, account )
    if ( response == False ):
        return None

    # Return the certificate to API Gateway.
    
    return certificate_body