constructor()

in modules/branch-keystore-node/src/kms_config.ts [80:126]

• 32 lines of code
• 9 McCabe index (conditional complexity)

  constructor(config: KmsConfig) {
    readOnlyProperty(this, '_config', config)
    /* Precondition: config must be a string or object */
    const configType = typeof config
    needs(
      !!config && (configType === 'object' || configType === 'string'),
      'Config must be a `discovery` or an object.'
    )

    if (configType === 'string') {
      /* Precondition: Only `discovery` is a valid string value */
      needs(config === 'discovery', 'Unexpected config shape')
    } else if (
      'identifier' in (config as any) ||
      'mrkIdentifier' in (config as any)
    ) {
      const arn =
        'identifier' in (config as any)
          ? (config as any).identifier
          : (config as any).mrkIdentifier
      /* Precondition: ARN must be a string */
      needs(typeof arn === 'string', 'ARN must be a string')

      //= aws-encryption-sdk-specification/framework/branch-key-store.md#aws-kms-configuration
      //# To be clear, an KMS ARN for a Multi-Region Key MAY be provided to the `KMS Key ARN` configuration,
      //# and a KMS ARN for non Multi-Region Key MAY be provided to the `KMS MRKey ARN` configuration.

      //= aws-encryption-sdk-specification/framework/branch-key-store.md#aws-kms-configuration
      //# This ARN MUST NOT be an Alias.
      //# This ARN MUST be a valid
      //# [AWS KMS Key ARN](./aws-kms/aws-kms-key-arn.md#a-valid-aws-kms-arn).
      const parsedArn = parseAwsKmsKeyArn(arn)
      needs(
        parsedArn && parsedArn.ResourceType === 'key',
        `${arn} must be a well-formed AWS KMS non-alias resource arn`
      )

      readOnlyProperty(this, '_parsedArn', parsedArn)
      readOnlyProperty(this, '_arn', arn)
    } else if ('region' in (config as any)) {
      readOnlyProperty(this, '_mrkRegion', (config as any).region)
    } else {
      needs(false, 'Unexpected config shape')
    }

    Object.freeze(this)
  }