aws-cdk
Version:
AWS CDK CLI, the command line tool for CDK apps
287 lines • 46 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.VpcNetworkContextProviderPlugin = void 0;
const cx_api_1 = require("@aws-cdk/cx-api");
const api_1 = require("../../../@aws-cdk/tmp-toolkit-helpers/src/api");
const sdk_provider_1 = require("../api/aws-auth/sdk-provider");
class VpcNetworkContextProviderPlugin {
constructor(aws, io) {
this.aws = aws;
this.io = io;
}
async getValue(args) {
const ec2 = (await (0, sdk_provider_1.initContextProviderSdk)(this.aws, args)).ec2();
const vpcId = await this.findVpc(ec2, args);
return this.readVpcProps(ec2, vpcId, args);
}
async findVpc(ec2, args) {
// Build request filter (map { Name -> Value } to list of [{ Name, Values }])
const filters = Object.entries(args.filter).map(([tag, value]) => ({ Name: tag, Values: [value] }));
await this.io.debug(`Listing VPCs in ${args.account}:${args.region}`);
const response = await ec2.describeVpcs({ Filters: filters });
const vpcs = response.Vpcs || [];
if (vpcs.length === 0) {
throw new api_1.ContextProviderError(`Could not find any VPCs matching ${JSON.stringify(args)}`);
}
if (vpcs.length > 1) {
throw new api_1.ContextProviderError(`Found ${vpcs.length} VPCs matching ${JSON.stringify(args)}; please narrow the search criteria`);
}
return vpcs[0];
}
async readVpcProps(ec2, vpc, args) {
const vpcId = vpc.VpcId;
await this.io.debug(`Describing VPC ${vpcId}`);
const filters = { Filters: [{ Name: 'vpc-id', Values: [vpcId] }] };
const subnetsResponse = await ec2.describeSubnets(filters);
const listedSubnets = subnetsResponse.Subnets || [];
const routeTablesResponse = await ec2.describeRouteTables(filters);
const routeTables = new RouteTables(routeTablesResponse.RouteTables || []);
// Now comes our job to separate these subnets out into AZs and subnet groups (Public, Private, Isolated)
// We have the following attributes to go on:
// - Type tag, we tag subnets with their type. In absence of this tag, we
// determine the subnet must be Public if either:
// a) it has the property MapPublicIpOnLaunch
// b) it has a route to an Internet Gateway
// If both of the above is false but the subnet has a route to a NAT Gateway
// and the destination CIDR block is "0.0.0.0/0", we assume it to be a Private subnet.
// Anything else is considered Isolated.
// - Name tag, we tag subnets with their subnet group name. In absence of this tag,
// we use the type as the name.
const azs = Array.from(new Set(listedSubnets.map((s) => s.AvailabilityZone)));
azs.sort();
const subnets = listedSubnets.map((subnet) => {
let type = getTag('aws-cdk:subnet-type', subnet.Tags);
if (type === undefined && subnet.MapPublicIpOnLaunch) {
type = SubnetType.Public;
}
if (type === undefined && routeTables.hasRouteToIgw(subnet.SubnetId)) {
type = SubnetType.Public;
}
if (type === undefined && routeTables.hasRouteToNatGateway(subnet.SubnetId)) {
type = SubnetType.Private;
}
if (type === undefined && routeTables.hasRouteToTransitGateway(subnet.SubnetId)) {
type = SubnetType.Private;
}
if (type === undefined) {
type = SubnetType.Isolated;
}
if (!isValidSubnetType(type)) {
// eslint-disable-next-line max-len
throw new api_1.ContextProviderError(`Subnet ${subnet.SubnetArn} has invalid subnet type ${type} (must be ${SubnetType.Public}, ${SubnetType.Private} or ${SubnetType.Isolated})`);
}
if (args.subnetGroupNameTag && !getTag(args.subnetGroupNameTag, subnet.Tags)) {
throw new api_1.ContextProviderError(`Invalid subnetGroupNameTag: Subnet ${subnet.SubnetArn} does not have an associated tag with Key='${args.subnetGroupNameTag}'`);
}
const name = getTag(args.subnetGroupNameTag || 'aws-cdk:subnet-name', subnet.Tags) || type;
const routeTableId = routeTables.routeTableIdForSubnetId(subnet.SubnetId);
if (!routeTableId) {
throw new api_1.ContextProviderError(`Subnet ${subnet.SubnetArn} does not have an associated route table (and there is no "main" table)`);
}
return {
az: subnet.AvailabilityZone,
cidr: subnet.CidrBlock,
type,
name,
subnetId: subnet.SubnetId,
routeTableId,
};
});
let grouped;
let assymetricSubnetGroups;
if (args.returnAsymmetricSubnets) {
grouped = { azs: [], groups: [] };
assymetricSubnetGroups = groupAsymmetricSubnets(subnets);
}
else {
grouped = groupSubnets(subnets);
assymetricSubnetGroups = undefined;
}
// Find attached+available VPN gateway for this VPC
const vpnGatewayResponse = (args.returnVpnGateways ?? true)
? await ec2.describeVpnGateways({
Filters: [
{
Name: 'attachment.vpc-id',
Values: [vpcId],
},
{
Name: 'attachment.state',
Values: ['attached'],
},
{
Name: 'state',
Values: ['available'],
},
],
})
: undefined;
const vpnGatewayId = vpnGatewayResponse?.VpnGateways?.length === 1 ? vpnGatewayResponse.VpnGateways[0].VpnGatewayId : undefined;
return {
vpcId,
vpcCidrBlock: vpc.CidrBlock,
ownerAccountId: vpc.OwnerId,
availabilityZones: grouped.azs,
isolatedSubnetIds: collapse(flatMap(findGroups(SubnetType.Isolated, grouped), (group) => group.subnets.map((s) => s.subnetId))),
isolatedSubnetNames: collapse(flatMap(findGroups(SubnetType.Isolated, grouped), (group) => (group.name ? [group.name] : []))),
isolatedSubnetRouteTableIds: collapse(flatMap(findGroups(SubnetType.Isolated, grouped), (group) => group.subnets.map((s) => s.routeTableId))),
privateSubnetIds: collapse(flatMap(findGroups(SubnetType.Private, grouped), (group) => group.subnets.map((s) => s.subnetId))),
privateSubnetNames: collapse(flatMap(findGroups(SubnetType.Private, grouped), (group) => (group.name ? [group.name] : []))),
privateSubnetRouteTableIds: collapse(flatMap(findGroups(SubnetType.Private, grouped), (group) => group.subnets.map((s) => s.routeTableId))),
publicSubnetIds: collapse(flatMap(findGroups(SubnetType.Public, grouped), (group) => group.subnets.map((s) => s.subnetId))),
publicSubnetNames: collapse(flatMap(findGroups(SubnetType.Public, grouped), (group) => (group.name ? [group.name] : []))),
publicSubnetRouteTableIds: collapse(flatMap(findGroups(SubnetType.Public, grouped), (group) => group.subnets.map((s) => s.routeTableId))),
vpnGatewayId,
subnetGroups: assymetricSubnetGroups,
};
}
}
exports.VpcNetworkContextProviderPlugin = VpcNetworkContextProviderPlugin;
class RouteTables {
constructor(tables) {
this.tables = tables;
this.mainRouteTable = this.tables.find((table) => !!table.Associations && table.Associations.some((assoc) => !!assoc.Main));
}
routeTableIdForSubnetId(subnetId) {
const table = this.tableForSubnet(subnetId);
return (table && table.RouteTableId) || (this.mainRouteTable && this.mainRouteTable.RouteTableId);
}
/**
* Whether the given subnet has a route to a NAT Gateway
*/
hasRouteToNatGateway(subnetId) {
const table = this.tableForSubnet(subnetId) || this.mainRouteTable;
return (!!table &&
!!table.Routes &&
table.Routes.some((route) => !!route.NatGatewayId && route.DestinationCidrBlock === '0.0.0.0/0'));
}
/**
* Whether the given subnet has a route to a Transit Gateway
*/
hasRouteToTransitGateway(subnetId) {
const table = this.tableForSubnet(subnetId) || this.mainRouteTable;
return (!!table &&
!!table.Routes &&
table.Routes.some((route) => !!route.TransitGatewayId && route.DestinationCidrBlock === '0.0.0.0/0'));
}
/**
* Whether the given subnet has a route to an IGW
*/
hasRouteToIgw(subnetId) {
const table = this.tableForSubnet(subnetId) || this.mainRouteTable;
return (!!table && !!table.Routes && table.Routes.some((route) => !!route.GatewayId && route.GatewayId.startsWith('igw-')));
}
tableForSubnet(subnetId) {
return this.tables.find((table) => !!table.Associations && table.Associations.some((assoc) => assoc.SubnetId === subnetId));
}
}
/**
* Return the value of a tag from a set of tags
*/
function getTag(name, tags) {
for (const tag of tags || []) {
if (tag.Key === name) {
return tag.Value;
}
}
return undefined;
}
/**
* Group subnets of the same type together, and order by AZ
*/
function groupSubnets(subnets) {
const grouping = {};
for (const subnet of subnets) {
const key = [subnet.type, subnet.name].toString();
if (!(key in grouping)) {
grouping[key] = [];
}
grouping[key].push(subnet);
}
const groups = Object.values(grouping).map((sns) => {
sns.sort((a, b) => a.az.localeCompare(b.az));
return {
type: sns[0].type,
name: sns[0].name,
subnets: sns,
};
});
const azs = groups[0].subnets.map((s) => s.az);
for (const group of groups) {
const groupAZs = group.subnets.map((s) => s.az);
if (!arraysEqual(groupAZs, azs)) {
throw new api_1.ContextProviderError(`Not all subnets in VPC have the same AZs: ${groupAZs} vs ${azs}`);
}
}
return { azs, groups };
}
function groupAsymmetricSubnets(subnets) {
const grouping = {};
for (const subnet of subnets) {
const key = [subnet.type, subnet.name].toString();
if (!(key in grouping)) {
grouping[key] = [];
}
grouping[key].push(subnet);
}
return Object.values(grouping).map((subnetArray) => {
subnetArray.sort((subnet1, subnet2) => subnet1.az.localeCompare(subnet2.az));
return {
name: subnetArray[0].name,
type: subnetTypeToVpcSubnetType(subnetArray[0].type),
subnets: subnetArray.map((subnet) => ({
subnetId: subnet.subnetId,
cidr: subnet.cidr,
availabilityZone: subnet.az,
routeTableId: subnet.routeTableId,
})),
};
});
}
function subnetTypeToVpcSubnetType(type) {
switch (type) {
case SubnetType.Isolated:
return cx_api_1.VpcSubnetGroupType.ISOLATED;
case SubnetType.Private:
return cx_api_1.VpcSubnetGroupType.PRIVATE;
case SubnetType.Public:
return cx_api_1.VpcSubnetGroupType.PUBLIC;
}
}
var SubnetType;
(function (SubnetType) {
SubnetType["Public"] = "Public";
SubnetType["Private"] = "Private";
SubnetType["Isolated"] = "Isolated";
})(SubnetType || (SubnetType = {}));
function isValidSubnetType(val) {
return val === SubnetType.Public || val === SubnetType.Private || val === SubnetType.Isolated;
}
function arraysEqual(as, bs) {
if (as.length !== bs.length) {
return false;
}
for (let i = 0; i < as.length; i++) {
if (as[i] !== bs[i]) {
return false;
}
}
return true;
}
function findGroups(type, groups) {
return groups.groups.filter((g) => g.type === type);
}
function flatMap(xs, fn) {
const ret = new Array();
for (const x of xs) {
ret.push(...fn(x));
}
return ret;
}
function collapse(xs) {
if (xs.length > 0) {
return xs;
}
return undefined;
}
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type { VpcContextQuery } from '@aws-cdk/cloud-assembly-schema';\nimport { type VpcContextResponse, type VpcSubnetGroup, VpcSubnetGroupType } from '@aws-cdk/cx-api';\nimport type { Filter, RouteTable, Tag, Vpc } from '@aws-sdk/client-ec2';\nimport type { IContextProviderMessages } from '.';\nimport { ContextProviderError } from '../../../@aws-cdk/tmp-toolkit-helpers/src/api';\nimport type { IEC2Client } from '../api';\nimport { type SdkProvider, initContextProviderSdk } from '../api/aws-auth/sdk-provider';\nimport type { ContextProviderPlugin } from '../api/plugin';\n\nexport class VpcNetworkContextProviderPlugin implements ContextProviderPlugin {\n  constructor(private readonly aws: SdkProvider, private readonly io: IContextProviderMessages) {\n  }\n\n  public async getValue(args: VpcContextQuery) {\n    const ec2 = (await initContextProviderSdk(this.aws, args)).ec2();\n\n    const vpcId = await this.findVpc(ec2, args);\n\n    return this.readVpcProps(ec2, vpcId, args);\n  }\n\n  private async findVpc(ec2: IEC2Client, args: VpcContextQuery): Promise<Vpc> {\n    // Build request filter (map { Name -> Value } to list of [{ Name, Values }])\n    const filters: Filter[] = Object.entries(args.filter).map(([tag, value]) => ({ Name: tag, Values: [value] }));\n\n    await this.io.debug(`Listing VPCs in ${args.account}:${args.region}`);\n    const response = await ec2.describeVpcs({ Filters: filters });\n\n    const vpcs = response.Vpcs || [];\n    if (vpcs.length === 0) {\n      throw new ContextProviderError(`Could not find any VPCs matching ${JSON.stringify(args)}`);\n    }\n    if (vpcs.length > 1) {\n      throw new ContextProviderError(`Found ${vpcs.length} VPCs matching ${JSON.stringify(args)}; please narrow the search criteria`);\n    }\n\n    return vpcs[0];\n  }\n\n  private async readVpcProps(ec2: IEC2Client, vpc: Vpc, args: VpcContextQuery): Promise<VpcContextResponse> {\n    const vpcId = vpc.VpcId!;\n\n    await this.io.debug(`Describing VPC ${vpcId}`);\n\n    const filters = { Filters: [{ Name: 'vpc-id', Values: [vpcId] }] };\n\n    const subnetsResponse = await ec2.describeSubnets(filters);\n    const listedSubnets = subnetsResponse.Subnets || [];\n\n    const routeTablesResponse = await ec2.describeRouteTables(filters);\n    const routeTables = new RouteTables(routeTablesResponse.RouteTables || []);\n\n    // Now comes our job to separate these subnets out into AZs and subnet groups (Public, Private, Isolated)\n    // We have the following attributes to go on:\n    // - Type tag, we tag subnets with their type. In absence of this tag, we\n    //   determine the subnet must be Public if either:\n    //   a) it has the property MapPublicIpOnLaunch\n    //   b) it has a route to an Internet Gateway\n    //   If both of the above is false but the subnet has a route to a NAT Gateway\n    //   and the destination CIDR block is \"0.0.0.0/0\", we assume it to be a Private subnet.\n    //   Anything else is considered Isolated.\n    // - Name tag, we tag subnets with their subnet group name. In absence of this tag,\n    //   we use the type as the name.\n\n    const azs = Array.from(new Set<string>(listedSubnets.map((s) => s.AvailabilityZone!)));\n    azs.sort();\n\n    const subnets: Subnet[] = listedSubnets.map((subnet) => {\n      let type = getTag('aws-cdk:subnet-type', subnet.Tags);\n      if (type === undefined && subnet.MapPublicIpOnLaunch) {\n        type = SubnetType.Public;\n      }\n      if (type === undefined && routeTables.hasRouteToIgw(subnet.SubnetId)) {\n        type = SubnetType.Public;\n      }\n      if (type === undefined && routeTables.hasRouteToNatGateway(subnet.SubnetId)) {\n        type = SubnetType.Private;\n      }\n      if (type === undefined && routeTables.hasRouteToTransitGateway(subnet.SubnetId)) {\n        type = SubnetType.Private;\n      }\n      if (type === undefined) {\n        type = SubnetType.Isolated;\n      }\n\n      if (!isValidSubnetType(type)) {\n        // eslint-disable-next-line max-len\n        throw new ContextProviderError(\n          `Subnet ${subnet.SubnetArn} has invalid subnet type ${type} (must be ${SubnetType.Public}, ${SubnetType.Private} or ${SubnetType.Isolated})`,\n        );\n      }\n\n      if (args.subnetGroupNameTag && !getTag(args.subnetGroupNameTag, subnet.Tags)) {\n        throw new ContextProviderError(\n          `Invalid subnetGroupNameTag: Subnet ${subnet.SubnetArn} does not have an associated tag with Key='${args.subnetGroupNameTag}'`,\n        );\n      }\n\n      const name = getTag(args.subnetGroupNameTag || 'aws-cdk:subnet-name', subnet.Tags) || type;\n      const routeTableId = routeTables.routeTableIdForSubnetId(subnet.SubnetId);\n\n      if (!routeTableId) {\n        throw new ContextProviderError(\n          `Subnet ${subnet.SubnetArn} does not have an associated route table (and there is no \"main\" table)`,\n        );\n      }\n\n      return {\n        az: subnet.AvailabilityZone!,\n        cidr: subnet.CidrBlock!,\n        type,\n        name,\n        subnetId: subnet.SubnetId!,\n        routeTableId,\n      };\n    });\n\n    let grouped: SubnetGroups;\n    let assymetricSubnetGroups: VpcSubnetGroup[] | undefined;\n    if (args.returnAsymmetricSubnets) {\n      grouped = { azs: [], groups: [] };\n      assymetricSubnetGroups = groupAsymmetricSubnets(subnets);\n    } else {\n      grouped = groupSubnets(subnets);\n      assymetricSubnetGroups = undefined;\n    }\n\n    // Find attached+available VPN gateway for this VPC\n    const vpnGatewayResponse =\n      (args.returnVpnGateways ?? true)\n        ? await ec2.describeVpnGateways({\n          Filters: [\n            {\n              Name: 'attachment.vpc-id',\n              Values: [vpcId],\n            },\n            {\n              Name: 'attachment.state',\n              Values: ['attached'],\n            },\n            {\n              Name: 'state',\n              Values: ['available'],\n            },\n          ],\n        })\n        : undefined;\n    const vpnGatewayId =\n      vpnGatewayResponse?.VpnGateways?.length === 1 ? vpnGatewayResponse.VpnGateways[0].VpnGatewayId : undefined;\n\n    return {\n      vpcId,\n      vpcCidrBlock: vpc.CidrBlock!,\n      ownerAccountId: vpc.OwnerId,\n      availabilityZones: grouped.azs,\n      isolatedSubnetIds: collapse(\n        flatMap(findGroups(SubnetType.Isolated, grouped), (group) => group.subnets.map((s) => s.subnetId)),\n      ),\n      isolatedSubnetNames: collapse(\n        flatMap(findGroups(SubnetType.Isolated, grouped), (group) => (group.name ? [group.name] : [])),\n      ),\n      isolatedSubnetRouteTableIds: collapse(\n        flatMap(findGroups(SubnetType.Isolated, grouped), (group) => group.subnets.map((s) => s.routeTableId)),\n      ),\n      privateSubnetIds: collapse(\n        flatMap(findGroups(SubnetType.Private, grouped), (group) => group.subnets.map((s) => s.subnetId)),\n      ),\n      privateSubnetNames: collapse(\n        flatMap(findGroups(SubnetType.Private, grouped), (group) => (group.name ? [group.name] : [])),\n      ),\n      privateSubnetRouteTableIds: collapse(\n        flatMap(findGroups(SubnetType.Private, grouped), (group) => group.subnets.map((s) => s.routeTableId)),\n      ),\n      publicSubnetIds: collapse(\n        flatMap(findGroups(SubnetType.Public, grouped), (group) => group.subnets.map((s) => s.subnetId)),\n      ),\n      publicSubnetNames: collapse(\n        flatMap(findGroups(SubnetType.Public, grouped), (group) => (group.name ? [group.name] : [])),\n      ),\n      publicSubnetRouteTableIds: collapse(\n        flatMap(findGroups(SubnetType.Public, grouped), (group) => group.subnets.map((s) => s.routeTableId)),\n      ),\n      vpnGatewayId,\n      subnetGroups: assymetricSubnetGroups,\n    };\n  }\n}\n\nclass RouteTables {\n  public readonly mainRouteTable?: RouteTable;\n\n  constructor(private readonly tables: RouteTable[]) {\n    this.mainRouteTable = this.tables.find(\n      (table) => !!table.Associations && table.Associations.some((assoc) => !!assoc.Main),\n    );\n  }\n\n  public routeTableIdForSubnetId(subnetId: string | undefined): string | undefined {\n    const table = this.tableForSubnet(subnetId);\n    return (table && table.RouteTableId) || (this.mainRouteTable && this.mainRouteTable.RouteTableId);\n  }\n\n  /**\n   * Whether the given subnet has a route to a NAT Gateway\n   */\n  public hasRouteToNatGateway(subnetId: string | undefined): boolean {\n    const table = this.tableForSubnet(subnetId) || this.mainRouteTable;\n\n    return (\n      !!table &&\n      !!table.Routes &&\n      table.Routes.some((route) => !!route.NatGatewayId && route.DestinationCidrBlock === '0.0.0.0/0')\n    );\n  }\n\n  /**\n   * Whether the given subnet has a route to a Transit Gateway\n   */\n  public hasRouteToTransitGateway(subnetId: string | undefined): boolean {\n    const table = this.tableForSubnet(subnetId) || this.mainRouteTable;\n\n    return (\n      !!table &&\n      !!table.Routes &&\n      table.Routes.some((route) => !!route.TransitGatewayId && route.DestinationCidrBlock === '0.0.0.0/0')\n    );\n  }\n\n  /**\n   * Whether the given subnet has a route to an IGW\n   */\n  public hasRouteToIgw(subnetId: string | undefined): boolean {\n    const table = this.tableForSubnet(subnetId) || this.mainRouteTable;\n\n    return (\n      !!table && !!table.Routes && table.Routes.some((route) => !!route.GatewayId && route.GatewayId.startsWith('igw-'))\n    );\n  }\n\n  public tableForSubnet(subnetId: string | undefined) {\n    return this.tables.find(\n      (table) => !!table.Associations && table.Associations.some((assoc) => assoc.SubnetId === subnetId),\n    );\n  }\n}\n\n/**\n * Return the value of a tag from a set of tags\n */\nfunction getTag(name: string, tags?: Tag[]): string | undefined {\n  for (const tag of tags || []) {\n    if (tag.Key === name) {\n      return tag.Value;\n    }\n  }\n  return undefined;\n}\n\n/**\n * Group subnets of the same type together, and order by AZ\n */\nfunction groupSubnets(subnets: Subnet[]): SubnetGroups {\n  const grouping: { [key: string]: Subnet[] } = {};\n  for (const subnet of subnets) {\n    const key = [subnet.type, subnet.name].toString();\n    if (!(key in grouping)) {\n      grouping[key] = [];\n    }\n    grouping[key].push(subnet);\n  }\n\n  const groups = Object.values(grouping).map((sns) => {\n    sns.sort((a: Subnet, b: Subnet) => a.az.localeCompare(b.az));\n    return {\n      type: sns[0].type,\n      name: sns[0].name,\n      subnets: sns,\n    };\n  });\n\n  const azs = groups[0].subnets.map((s) => s.az);\n\n  for (const group of groups) {\n    const groupAZs = group.subnets.map((s) => s.az);\n    if (!arraysEqual(groupAZs, azs)) {\n      throw new ContextProviderError(`Not all subnets in VPC have the same AZs: ${groupAZs} vs ${azs}`);\n    }\n  }\n\n  return { azs, groups };\n}\n\nfunction groupAsymmetricSubnets(subnets: Subnet[]): VpcSubnetGroup[] {\n  const grouping: { [key: string]: Subnet[] } = {};\n  for (const subnet of subnets) {\n    const key = [subnet.type, subnet.name].toString();\n    if (!(key in grouping)) {\n      grouping[key] = [];\n    }\n    grouping[key].push(subnet);\n  }\n\n  return Object.values(grouping).map((subnetArray) => {\n    subnetArray.sort((subnet1: Subnet, subnet2: Subnet) => subnet1.az.localeCompare(subnet2.az));\n\n    return {\n      name: subnetArray[0].name,\n      type: subnetTypeToVpcSubnetType(subnetArray[0].type),\n      subnets: subnetArray.map((subnet) => ({\n        subnetId: subnet.subnetId,\n        cidr: subnet.cidr,\n        availabilityZone: subnet.az,\n        routeTableId: subnet.routeTableId,\n      })),\n    };\n  });\n}\n\nfunction subnetTypeToVpcSubnetType(type: SubnetType): VpcSubnetGroupType {\n  switch (type) {\n    case SubnetType.Isolated:\n      return VpcSubnetGroupType.ISOLATED;\n    case SubnetType.Private:\n      return VpcSubnetGroupType.PRIVATE;\n    case SubnetType.Public:\n      return VpcSubnetGroupType.PUBLIC;\n  }\n}\n\nenum SubnetType {\n  Public = 'Public',\n  Private = 'Private',\n  Isolated = 'Isolated',\n}\n\nfunction isValidSubnetType(val: string): val is SubnetType {\n  return val === SubnetType.Public || val === SubnetType.Private || val === SubnetType.Isolated;\n}\n\ninterface Subnet {\n  az: string;\n  cidr: string;\n  type: SubnetType;\n  name: string;\n  routeTableId: string;\n  subnetId: string;\n}\n\ninterface SubnetGroup {\n  type: SubnetType;\n  name: string;\n  subnets: Subnet[];\n}\n\ninterface SubnetGroups {\n  azs: string[];\n  groups: SubnetGroup[];\n}\n\nfunction arraysEqual(as: string[], bs: string[]): boolean {\n  if (as.length !== bs.length) {\n    return false;\n  }\n\n  for (let i = 0; i < as.length; i++) {\n    if (as[i] !== bs[i]) {\n      return false;\n    }\n  }\n\n  return true;\n}\n\nfunction findGroups(type: SubnetType, groups: SubnetGroups): SubnetGroup[] {\n  return groups.groups.filter((g) => g.type === type);\n}\n\nfunction flatMap<T, U>(xs: T[], fn: (x: T) => U[]): U[] {\n  const ret = new Array<U>();\n  for (const x of xs) {\n    ret.push(...fn(x));\n  }\n  return ret;\n}\n\nfunction collapse<T>(xs: T[]): T[] | undefined {\n  if (xs.length > 0) {\n    return xs;\n  }\n  return undefined;\n}\n"]}