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import {Construct} from 'constructs';
import * as cdk from "aws-cdk-lib";
import * as iam from "aws-cdk-lib/aws-iam";
import * as route53 from "aws-cdk-lib/aws-route53";
import { RecordTarget } from "aws-cdk-lib/aws-route53";
import {Account} from './account';
import * as utils from './dns/delegation-record-handler/utils';
/**
* Properties for RootDns
*/
export interface RootDnsProps {
/**
* The stages Accounts taht will need their subzone delegation
*/
readonly stagesAccounts: Account[];
/**
* The top level domain name
*/
readonly rootHostedZoneDNSName: string;
/**
* A boolean indicating if Domain name has already been registered to a third party or if you want this contruct to create it (the latter is not yet supported)
*/
readonly thirdPartyProviderDNSUsed?: boolean;
}
/**
* A class creating the main hosted zone and a role assumable by stages account to be able to set sub domain delegation
*/
export class RootDns extends Construct {
rootHostedZone: route53.IHostedZone;
constructor(scope: Construct, id: string, props: RootDnsProps) {
super(scope, id);
this.rootHostedZone = this.createRootHostedZone(props);
for (const accountIndex in props.stagesAccounts) {
const account = props.stagesAccounts[accountIndex];
const stageSubZone = this.createStageSubZone(
account,
props.rootHostedZoneDNSName
);
this.createDNSAutoUpdateRole(account, stageSubZone);
if (stageSubZone.hostedZoneNameServers) {
new route53.RecordSet(
this,
`${account.accountName}SubZoneDelegationNSRecord`,
{
recordType: route53.RecordType.NS,
target: RecordTarget.fromValues(...stageSubZone.hostedZoneNameServers?stageSubZone.hostedZoneNameServers:''),
recordName: stageSubZone.zoneName,
zone: this.rootHostedZone,
}
);
}
}
if (
props.thirdPartyProviderDNSUsed &&
this.rootHostedZone.hostedZoneNameServers
) {
new cdk.CfnOutput(this, `NS records`, {
value: cdk.Fn.join(",", this.rootHostedZone.hostedZoneNameServers),
});
} else E{
throw new Error("Creation of DNS domain is not yet supported");
// TODO: implement call to https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/Route53Domains.html#registerDomain-property
}
}
createStageSubZone(
account: Account,
rootHostedZoneDNSName: string
): route53.HostedZone {
const subDomainPrefix = utils.getSubdomainPrefix(account.accountName, account.accountStageName);
return new route53.HostedZone(this, `${subDomainPrefix}StageSubZone`, {
zoneName: `${subDomainPrefix}.${rootHostedZoneDNSName}`,
});
}
createDNSAutoUpdateRole(
account: Account,
stageSubZone: route53.HostedZone
) {
const dnsAutoUpdateRole = new iam.Role(this, stageSubZone.zoneName, {
assumedBy: new iam.AccountPrincipal(account.accountId),
roleName: utils.getDNSUpdateRoleNameFromSubZoneName(stageSubZone.zoneName)
});
dnsAutoUpdateRole.addToPolicy(
new iam.PolicyStatement({
resources: [stageSubZone.hostedZoneArn],
actions: [
"route53:GetHostedZone",
"route53:ChangeResourceRecordSets",
"route53:TestDNSAnswer",
],
})
);
dnsAutoUpdateRole.addToPolicy(
new iam.PolicyStatement({
resources: ['*'],
actions: [
"route53:ListHostedZonesByName"
],
})
);
return dnsAutoUpdateRole;
}
createRootHostedZone(props: RootDnsProps) {
return new route53.HostedZone(this, "RootHostedZone", {
zoneName: props.rootHostedZoneDNSName,
});
}
}
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