def __init__()

in samcli/lib/utils/arn_utils.py [0:0]

• 27 lines of code
• 17 McCabe index (conditional complexity)

    def __init__(self, arn: str) -> None:
        # Regex pattern formed based on the 3 ARN general formats found here:
        # https://docs.aws.amazon.com/IAM/latest/UserGuide/reference-arns.html
        arn_pattern = (
            r"arn:([a-zA-Z0-9_-]+):"  # Pattern for partition
            r"([a-zA-Z0-9_-]+):"  # Pattern for service
            r"([a-zA-Z0-9_-]*):"  # Pattern for region
            r"([a-zA-Z0-9_-]*)"  # Pattern for account_id
            r"(?::([a-zA-Z0-9_-]+))?"  # Pattern for resource_type if it exists
            r"(?::(.+))"  # Pattern for resource_id if it exists
        )

        matched_arn = re.match(arn_pattern, arn)
        if not matched_arn:
            raise InvalidArnValue(f"Invalid ARN ({arn}) provided")

        self.partition = matched_arn.group(1)
        self.service = matched_arn.group(2)
        self.region = matched_arn.group(3) if matched_arn.group(3) else ""
        self.account_id = matched_arn.group(4) if matched_arn.group(4) else ""
        self.resource_type = matched_arn.group(5) if matched_arn.group(5) else ""
        if matched_arn.group(5):
            # This handles the Arns of services with the format:
            # arn:partition:service:region:account-id:resource-type:resource-id
            self.resource_type = matched_arn.group(5)
            self.resource_id = matched_arn.group(6) if matched_arn.group(6) else ""
        elif "/" in matched_arn.group(6):
            # This handles the Arns of services with the format:
            # arn:partition:service:region:account-id:resource-type/resource-id
            split_resource_type_and_id = matched_arn.group(6).split("/", 1)
            self.resource_type = split_resource_type_and_id[0]
            self.resource_id = split_resource_type_and_id[1]
        else:
            # This handles the Arns of services with the format:
            # arn:partition:service:region:account-id:resource-id
            self.resource_type = ""
            self.resource_id = matched_arn.group(6) if matched_arn.group(6) else ""