async editKmsPolicy()

in source/services/tasks/tasks.ts [1152:1204]
49 lines of code
3 McCabe index (conditional complexity)

    async editKmsPolicy(taskId: string, accounts: string[]): Promise<void | ErrorReturn> {
        let policy = {};

        // Gets KMS policy
        try {
            let params: AWS.KMS.GetKeyPolicyRequest = {
                KeyId: this.masterKmsArn,
                PolicyName: 'default'   // The only valid name is default.
            };
            let kmsPollicy = await this.kms.getKeyPolicy(params).promise();
            policy = JSON.parse(kmsPollicy.Policy);
        } catch (error) {
            LOGGER.error(`editKmsPolicy Error: ${JSON.stringify(error)}`);
            return Promise.reject(
                COMMON_UTIL.getErrorObject('EditKmsPolicyFailure', 500, 'Error occurred while getting KMS policy.', error)
            );
        }

        // Puts the new KMS policy
        try {
            let statement = (policy['Statement'] as object[]).filter((statement) => statement['Sid'] !== taskId);
            statement.push({
                Sid: taskId,
                Effect: 'Allow',
                Principal: {
                    AWS: [
                        ...
                        accounts.map((account) => {
                            return `arn:aws:iam::${account}:root`
                        })
                    ]
                },
                Action: [
                    "kms:Decrypt",
                    "kms:GenerateDataKey"
                ],
                Resource: [
                    this.masterKmsArn
                ]
            });
            policy['Statement'] = statement;
            await this.kms.putKeyPolicy({
                KeyId: this.masterKmsArn,
                Policy: JSON.stringify(policy),
                PolicyName: 'default'
            }).promise();
        } catch (error) {
            LOGGER.error(`editKmsPolicy Error: ${JSON.stringify(error)}`);
            return Promise.reject(
                COMMON_UTIL.getErrorObject('EditKmsPolicyFailure', 500, 'Error occurred while putting KMS policy.', error)
            );
        }
    }