cdk8s-plus-29
Version:
cdk8s+ is a software development framework that provides high level abstractions for authoring Kubernetes applications. cdk8s-plus-29 synthesizes Kubernetes manifests for Kubernetes 1.29.0
344 lines • 45.8 kB
JavaScript
"use strict";
var _a, _b, _c;
Object.defineProperty(exports, "__esModule", { value: true });
exports.NetworkPolicy = exports.NetworkPolicyTrafficDefault = exports.NetworkProtocol = exports.NetworkPolicyIpBlock = exports.NetworkPolicyPort = void 0;
exports.validatePeerConfig = validatePeerConfig;
const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
const cdk8s_1 = require("cdk8s");
const constructs_1 = require("constructs");
const base = require("./base");
const k8s = require("./imports/k8s");
const namespace = require("./namespace");
const pod = require("./pod");
const utils_1 = require("./utils");
/**
* Describes a port to allow traffic on.
*/
class NetworkPolicyPort {
/**
* Distinct TCP ports
*/
static tcp(port) {
return new NetworkPolicyPort(k8s.IntOrString.fromNumber(port), undefined, NetworkProtocol.TCP);
}
/**
* A TCP port range
*/
static tcpRange(startPort, endPort) {
return new NetworkPolicyPort(k8s.IntOrString.fromNumber(startPort), endPort, NetworkProtocol.TCP);
}
/**
* Any TCP traffic
*/
static allTcp() {
return new NetworkPolicyPort(k8s.IntOrString.fromNumber(0), 65535, NetworkProtocol.TCP);
}
/**
* Distinct UDP ports
*/
static udp(port) {
return new NetworkPolicyPort(k8s.IntOrString.fromNumber(port), undefined, NetworkProtocol.UDP);
}
/**
* A UDP port range
*/
static udpRange(startPort, endPort) {
return new NetworkPolicyPort(k8s.IntOrString.fromNumber(startPort), endPort, NetworkProtocol.UDP);
}
/**
* Any UDP traffic
*/
static allUdp() {
return new NetworkPolicyPort(k8s.IntOrString.fromNumber(0), 65535, NetworkProtocol.UDP);
}
/**
* Custom port configuration.
*/
static of(props) {
return new NetworkPolicyPort(props.port ? k8s.IntOrString.fromNumber(props.port) : undefined, props.endPort, props.protocol);
}
constructor(port, endPort, protocol) {
this.port = port;
this.endPort = endPort;
this.protocol = protocol;
}
/**
* @internal
*/
_toKube() {
return { port: this.port, endPort: this.endPort, protocol: this.protocol };
}
}
exports.NetworkPolicyPort = NetworkPolicyPort;
_a = JSII_RTTI_SYMBOL_1;
NetworkPolicyPort[_a] = { fqn: "cdk8s-plus-29.NetworkPolicyPort", version: "2.6.0" };
/**
* Describes a particular CIDR (Ex. "192.168.1.1/24","2001:db9::/64") that is
* allowed to the pods matched by a network policy selector.
* The except entry describes CIDRs that should not be included within this rule.
*/
class NetworkPolicyIpBlock extends constructs_1.Construct {
/**
* Create an IPv4 peer from a CIDR
*/
static ipv4(scope, id, cidrIp, except) {
const cidrMatch = cidrIp.match(/^(\d{1,3}\.){3}\d{1,3}(\/\d+)?$/);
if (!cidrMatch) {
throw new Error(`Invalid IPv4 CIDR: "${cidrIp}"`);
}
if (!cidrMatch[2]) {
throw new Error(`CIDR mask is missing in IPv4: "${cidrIp}". Did you mean "${cidrIp}/32"?`);
}
return new NetworkPolicyIpBlock(scope, id, cidrIp, except);
}
/**
* Any IPv4 address
*/
static anyIpv4(scope, id) {
return new NetworkPolicyIpBlock(scope, id, '0.0.0.0/0');
}
/**
* Create an IPv6 peer from a CIDR
*/
static ipv6(scope, id, cidrIp, except) {
const cidrMatch = cidrIp.match(/^([\da-f]{0,4}:){2,7}([\da-f]{0,4})?(\/\d+)?$/);
if (!cidrMatch) {
throw new Error(`Invalid IPv6 CIDR: "${cidrIp}"`);
}
if (!cidrMatch[3]) {
throw new Error(`CIDR mask is missing in IPv6: "${cidrIp}". Did you mean "${cidrIp}/128"?`);
}
return new NetworkPolicyIpBlock(scope, id, cidrIp, except);
}
/**
* Any IPv6 address
*/
static anyIpv6(scope, id) {
return new NetworkPolicyIpBlock(scope, id, '::/0');
}
constructor(scope, id,
/**
* A string representing the IP Block Valid examples are "192.168.1.1/24" or "2001:db9::/64".
*/
cidr,
/**
* A slice of CIDRs that should not be included within an IP Block Valid examples are "192.168.1.1/24" or "2001:db9::/64".
* Except values will be rejected if they are outside the CIDR range.
*/
except) {
super(scope, id);
this.cidr = cidr;
this.except = except;
}
/**
* @see INetworkPolicyPeer.toNetworkPolicyPeerConfig()
*/
toNetworkPolicyPeerConfig() {
return { ipBlock: this };
}
/**
* @see INetworkPolicyPeer.toPodSelector()
*/
toPodSelector() {
return undefined;
}
/**
* @internal
*/
_toKube() {
return { cidr: this.cidr, except: this.except };
}
}
exports.NetworkPolicyIpBlock = NetworkPolicyIpBlock;
_b = JSII_RTTI_SYMBOL_1;
NetworkPolicyIpBlock[_b] = { fqn: "cdk8s-plus-29.NetworkPolicyIpBlock", version: "2.6.0" };
/**
* Network protocols.
*/
var NetworkProtocol;
(function (NetworkProtocol) {
/**
* TCP.
*/
NetworkProtocol["TCP"] = "TCP";
/**
* UDP.
*/
NetworkProtocol["UDP"] = "UDP";
/**
* SCTP.
*/
NetworkProtocol["SCTP"] = "SCTP";
})(NetworkProtocol || (exports.NetworkProtocol = NetworkProtocol = {}));
/**
* Default behaviors of network traffic in policies.
*/
var NetworkPolicyTrafficDefault;
(function (NetworkPolicyTrafficDefault) {
/**
* The policy denies all traffic.
* Since rules are additive, additional rules or policies can allow
* specific traffic.
*/
NetworkPolicyTrafficDefault["DENY"] = "DENY";
/**
* The policy allows all traffic (either ingress or egress).
* Since rules are additive, no additional rule or policies can
* subsequently deny the traffic.
*/
NetworkPolicyTrafficDefault["ALLOW"] = "ALLOW";
})(NetworkPolicyTrafficDefault || (exports.NetworkPolicyTrafficDefault = NetworkPolicyTrafficDefault = {}));
/**
* Control traffic flow at the IP address or port level (OSI layer 3 or 4),
* network policies are an application-centric construct which allow you
* to specify how a pod is allowed to communicate with various network peers.
*
* - Outgoing traffic is allowed if there are no network policies selecting
* the pod (and cluster policy otherwise allows the traffic),
* OR if the traffic matches at least one egress rule across all of the
* network policies that select the pod.
*
* - Incoming traffic is allowed to a pod if there are no network policies
* selecting the pod (and cluster policy otherwise allows the traffic),
* OR if the traffic source is the pod's local node,
* OR if the traffic matches at least one ingress rule across all of
* the network policies that select the pod.
*
* Network policies do not conflict; they are additive.
* If any policy or policies apply to a given pod for a given
* direction, the connections allowed in that direction from
* that pod is the union of what the applicable policies allow.
* Thus, order of evaluation does not affect the policy result.
*
* For a connection from a source pod to a destination pod to be allowed,
* both the egress policy on the source pod and the ingress policy on the
* destination pod need to allow the connection.
* If either side does not allow the connection, it will not happen.
*
* @see https://kubernetes.io/docs/concepts/services-networking/network-policies/#networkpolicy-resource
*/
class NetworkPolicy extends base.Resource {
constructor(scope, id, props = {}) {
super(scope, id);
this.resourceType = 'networkpolicies';
this._egressRules = [];
this._ingressRules = [];
this._policyTypes = new Set();
const podSelector = props.selector ?? pod.Pods.all(this, 'AllPods');
this._podSelectorConfig = podSelector.toPodSelectorConfig();
let ns;
if (!props.metadata?.namespace) {
if (this._podSelectorConfig.namespaces?.labelSelector && !this._podSelectorConfig.namespaces?.labelSelector.isEmpty()) {
throw new Error(`Unable to create a network policy for a selector (${podSelector.node.path}) that selects pods in namespaces based on labels`);
}
if (this._podSelectorConfig.namespaces?.names && this._podSelectorConfig.namespaces.names.length > 1) {
throw new Error(`Unable to create a network policy for a selector (${podSelector.node.path}) that selects pods in multiple namespaces`);
}
ns = this._podSelectorConfig.namespaces?.names ? this._podSelectorConfig.namespaces?.names[0] : undefined;
}
else {
ns = props.metadata.namespace;
}
this.apiObject = new k8s.KubeNetworkPolicy(this, 'Resource', {
metadata: { ...props.metadata, namespace: ns },
spec: cdk8s_1.Lazy.any({ produce: () => this._toKube() }),
});
this.configureDefaultBehavior('Egress', props.egress?.default);
this.configureDefaultBehavior('Ingress', props.ingress?.default);
for (const rule of props.egress?.rules ?? []) {
this.addEgressRule(rule.peer, rule.ports);
}
for (const rule of props.ingress?.rules ?? []) {
this.addIngressRule(rule.peer, rule.ports);
}
}
/**
* Allow outgoing traffic to the peer.
*
* If ports are not passed, traffic will be allowed on all ports.
*/
addEgressRule(peer, ports) {
this._policyTypes.add('Egress');
this._egressRules.push({ ports: (ports ?? []).map(p => p._toKube()), to: this.createNetworkPolicyPeers(peer) });
}
/**
* Allow incoming traffic from the peer.
*
* If ports are not passed, traffic will be allowed on all ports.
*/
addIngressRule(peer, ports) {
this._policyTypes.add('Ingress');
this._ingressRules.push({ ports: (ports ?? []).map(p => p._toKube()), from: this.createNetworkPolicyPeers(peer) });
}
createNetworkPolicyPeers(peer) {
const config = peer.toNetworkPolicyPeerConfig();
validatePeerConfig(config);
if (config.ipBlock) {
// ip block is a single peer.
return [{ ipBlock: config.ipBlock._toKube() }];
}
if (!config.podSelector.namespaces?.names) {
// when no explicit namespaces are defined we can just use
// the selector as is
return [{
namespaceSelector: config.podSelector.namespaces?.labelSelector?._toKube(),
podSelector: config.podSelector.labelSelector._toKube(),
}];
}
// when explicit namespaces are defined, we need to create a separate
// peer for each, since a label selector cannot have multiple name labels. (they will conflict)
const namespaceSelector = config.podSelector?.namespaces?.labelSelector?._toKube() ?? {};
return config.podSelector.namespaces.names.map(n => ({
podSelector: config.podSelector.labelSelector._toKube(),
namespaceSelector: {
matchExpressions: namespaceSelector.matchExpressions,
matchLabels: {
...namespaceSelector.matchLabels,
[namespace.Namespace.NAME_LABEL]: n,
},
},
}));
}
configureDefaultBehavior(direction, _default) {
if (!_default) {
return;
}
if (_default === NetworkPolicyTrafficDefault.DENY) {
// https://kubernetes.io/docs/concepts/services-networking/network-policies/#default-deny-all-egress-traffic
this._policyTypes.add(direction);
}
if (_default === NetworkPolicyTrafficDefault.ALLOW) {
// https://kubernetes.io/docs/concepts/services-networking/network-policies/#allow-all-egress-traffic
this._policyTypes.add(direction);
if (direction === 'Egress') {
this._egressRules.push({});
}
else {
this._ingressRules.push({});
}
}
}
/**
* @internal
*/
_toKube() {
return {
podSelector: this._podSelectorConfig.labelSelector._toKube(),
egress: (0, utils_1.undefinedIfEmpty)(this._egressRules),
ingress: (0, utils_1.undefinedIfEmpty)(this._ingressRules),
policyTypes: (0, utils_1.undefinedIfEmpty)(Array.from(this._policyTypes)),
};
}
}
exports.NetworkPolicy = NetworkPolicy;
_c = JSII_RTTI_SYMBOL_1;
NetworkPolicy[_c] = { fqn: "cdk8s-plus-29.NetworkPolicy", version: "2.6.0" };
function validatePeerConfig(peerConfig) {
if (!peerConfig.ipBlock && !peerConfig.podSelector) {
throw new Error('Inavlid peer: either \'ipBlock\' or \'podSelector\' must be defined');
}
if (peerConfig.ipBlock && peerConfig.podSelector) {
throw new Error('Inavlid peer: only one of \'ipBlock\' and \'podSelector\' must be defined');
}
}
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{ ApiObject, Lazy } from 'cdk8s';\nimport { Construct, IConstruct } from 'constructs';\nimport * as base from './base';\nimport * as k8s from './imports/k8s';\nimport * as namespace from './namespace';\nimport * as pod from './pod';\nimport { undefinedIfEmpty } from './utils';\n\n/**\n * Properties for `NetworkPolicyPort`.\n */\nexport interface NetworkPolicyPortProps {\n\n  /**\n   * Specific port number.\n   *\n   * @default - all ports are allowed.\n   */\n  readonly port?: number;\n\n  /**\n   * End port (relative to `port`). Only applies if `port` is defined.\n   * Use this to specify a port range, rather that a specific one.\n   *\n   * @default - not a port range.\n   */\n  readonly endPort?: number;\n\n  /**\n   * Protocol.\n   *\n   * @default NetworkProtocol.TCP\n   */\n  readonly protocol?: NetworkProtocol;\n}\n\n/**\n * Describes a port to allow traffic on.\n */\nexport class NetworkPolicyPort {\n\n  /**\n   * Distinct TCP ports\n   */\n  public static tcp(port: number): NetworkPolicyPort {\n    return new NetworkPolicyPort(k8s.IntOrString.fromNumber(port), undefined, NetworkProtocol.TCP);\n  }\n\n  /**\n   * A TCP port range\n   */\n  public static tcpRange(startPort: number, endPort: number) {\n    return new NetworkPolicyPort(k8s.IntOrString.fromNumber(startPort), endPort, NetworkProtocol.TCP);\n  }\n\n  /**\n   * Any TCP traffic\n   */\n  public static allTcp() {\n    return new NetworkPolicyPort(k8s.IntOrString.fromNumber(0), 65535, NetworkProtocol.TCP);\n  }\n\n  /**\n   * Distinct UDP ports\n   */\n  public static udp(port: number): NetworkPolicyPort {\n    return new NetworkPolicyPort(k8s.IntOrString.fromNumber(port), undefined, NetworkProtocol.UDP);\n  }\n\n  /**\n   * A UDP port range\n   */\n  public static udpRange(startPort: number, endPort: number) {\n    return new NetworkPolicyPort(k8s.IntOrString.fromNumber(startPort), endPort, NetworkProtocol.UDP);\n  }\n\n  /**\n   * Any UDP traffic\n   */\n  public static allUdp() {\n    return new NetworkPolicyPort(k8s.IntOrString.fromNumber(0), 65535, NetworkProtocol.UDP);\n  }\n\n  /**\n   * Custom port configuration.\n   */\n  public static of(props: NetworkPolicyPortProps): NetworkPolicyPort {\n    return new NetworkPolicyPort(props.port ? k8s.IntOrString.fromNumber(props.port) : undefined, props.endPort, props.protocol);\n  }\n\n  private constructor(\n    private readonly port?: k8s.IntOrString,\n    private readonly endPort?: number,\n    private readonly protocol?: NetworkProtocol) {}\n\n  /**\n   * @internal\n   */\n  public _toKube(): k8s.NetworkPolicyPort {\n    return { port: this.port, endPort: this.endPort, protocol: this.protocol };\n  }\n\n}\n\n/**\n * Configuration for network peers.\n * A peer can either by an ip block, or a selection of pods, not both.\n */\nexport interface NetworkPolicyPeerConfig {\n\n  /**\n   * The ip block this peer represents.\n   */\n  readonly ipBlock?: NetworkPolicyIpBlock;\n\n  /**\n   * The pod selector this peer represents.\n   */\n  readonly podSelector?: pod.PodSelectorConfig;\n\n}\n\n/**\n * Describes a peer to allow traffic to/from.\n */\nexport interface INetworkPolicyPeer extends IConstruct {\n  /**\n   * Return the configuration of this peer.\n   */\n  toNetworkPolicyPeerConfig(): NetworkPolicyPeerConfig;\n\n  /**\n   * Convert the peer into a pod selector, if possible.\n   */\n  toPodSelector(): pod.IPodSelector | undefined;\n}\n\n/**\n * Describes a rule allowing traffic from / to pods matched by a network policy selector.\n */\nexport interface NetworkPolicyRule {\n\n  /**\n   * The ports of the rule.\n   *\n   * @default - traffic is allowed on all ports.\n   */\n  readonly ports?: NetworkPolicyPort[];\n\n  /**\n   * Peer this rule interacts with.\n   */\n  readonly peer: INetworkPolicyPeer;\n\n}\n\n/**\n * Describes a particular CIDR (Ex. \"192.168.1.1/24\",\"2001:db9::/64\") that is\n * allowed to the pods matched by a network policy selector.\n * The except entry describes CIDRs that should not be included within this rule.\n */\nexport class NetworkPolicyIpBlock extends Construct implements INetworkPolicyPeer {\n\n  /**\n   * Create an IPv4 peer from a CIDR\n   */\n  public static ipv4(scope: Construct, id: string, cidrIp: string, except?: string[]): NetworkPolicyIpBlock {\n    const cidrMatch = cidrIp.match(/^(\\d{1,3}\\.){3}\\d{1,3}(\\/\\d+)?$/);\n\n    if (!cidrMatch) {\n      throw new Error(`Invalid IPv4 CIDR: \"${cidrIp}\"`);\n    }\n\n    if (!cidrMatch[2]) {\n      throw new Error(`CIDR mask is missing in IPv4: \"${cidrIp}\". Did you mean \"${cidrIp}/32\"?`);\n    }\n\n    return new NetworkPolicyIpBlock(scope, id, cidrIp, except);\n  }\n\n  /**\n   * Any IPv4 address\n   */\n  public static anyIpv4(scope: Construct, id: string): NetworkPolicyIpBlock {\n    return new NetworkPolicyIpBlock(scope, id, '0.0.0.0/0');\n  }\n\n  /**\n   * Create an IPv6 peer from a CIDR\n   */\n  public static ipv6(scope: Construct, id: string, cidrIp: string, except?: string[]): NetworkPolicyIpBlock {\n\n    const cidrMatch = cidrIp.match(/^([\\da-f]{0,4}:){2,7}([\\da-f]{0,4})?(\\/\\d+)?$/);\n\n    if (!cidrMatch) {\n      throw new Error(`Invalid IPv6 CIDR: \"${cidrIp}\"`);\n    }\n\n    if (!cidrMatch[3]) {\n      throw new Error(`CIDR mask is missing in IPv6: \"${cidrIp}\". Did you mean \"${cidrIp}/128\"?`);\n    }\n\n    return new NetworkPolicyIpBlock(scope, id, cidrIp, except);\n  }\n\n  /**\n   * Any IPv6 address\n   */\n  public static anyIpv6(scope: Construct, id: string): NetworkPolicyIpBlock {\n    return new NetworkPolicyIpBlock(scope, id, '::/0');\n  }\n\n  private constructor(scope: Construct, id: string,\n    /**\n     * A string representing the IP Block Valid examples are \"192.168.1.1/24\" or \"2001:db9::/64\".\n     */\n    public readonly cidr: string,\n    /**\n     * A slice of CIDRs that should not be included within an IP Block Valid examples are \"192.168.1.1/24\" or \"2001:db9::/64\".\n     * Except values will be rejected if they are outside the CIDR range.\n     */\n    public readonly except?: string[]) {\n    super(scope, id);\n  }\n\n  /**\n   * @see INetworkPolicyPeer.toNetworkPolicyPeerConfig()\n   */\n  public toNetworkPolicyPeerConfig(): NetworkPolicyPeerConfig {\n    return { ipBlock: this };\n  }\n\n  /**\n   * @see INetworkPolicyPeer.toPodSelector()\n   */\n  public toPodSelector(): pod.IPodSelector | undefined {\n    return undefined;\n  }\n\n  /**\n   * @internal\n   */\n  public _toKube(): k8s.IpBlock {\n    return { cidr: this.cidr, except: this.except };\n  }\n\n}\n\n/**\n * Network protocols.\n */\nexport enum NetworkProtocol {\n  /**\n   * TCP.\n   */\n  TCP = 'TCP',\n  /**\n   * UDP.\n   */\n  UDP = 'UDP',\n  /**\n   * SCTP.\n   */\n  SCTP = 'SCTP',\n}\n\n/**\n * Default behaviors of network traffic in policies.\n */\nexport enum NetworkPolicyTrafficDefault {\n  /**\n   * The policy denies all traffic.\n   * Since rules are additive, additional rules or policies can allow\n   * specific traffic.\n   */\n  DENY = 'DENY',\n  /**\n   * The policy allows all traffic (either ingress or egress).\n   * Since rules are additive, no additional rule or policies can\n   * subsequently deny the traffic.\n   */\n  ALLOW = 'ALLOW',\n}\n\n/**\n * Describes how the network policy should configure egress / ingress traffic.\n */\nexport interface NetworkPolicyTraffic {\n\n  /**\n   * Specifies the default behavior of the policy when\n   * no rules are defined.\n   *\n   * @default - unset, the policy does not change the behavior.\n   */\n  readonly default?: NetworkPolicyTrafficDefault;\n\n  /**\n   * List of rules to be applied to the selected pods.\n   * If empty, the behavior of the policy is dictated by the `default` property.\n   *\n   * @default - no rules\n   */\n  readonly rules?: NetworkPolicyRule[];\n}\n\n/**\n * Options for `NetworkPolicy.addEgressRule`.\n */\nexport interface NetworkPolicyAddEgressRuleOptions {\n\n  /**\n   * Ports the rule should allow outgoing traffic to.\n   *\n   * @default - If the peer is a managed pod, take its ports. Otherwise, all ports are allowed.\n   */\n  readonly ports?: NetworkPolicyPort[];\n\n}\n\n\n/**\n * Properties for `NetworkPolicy`.\n */\nexport interface NetworkPolicyProps extends base.ResourceProps {\n\n  /**\n   * Which pods does this policy object applies to.\n   *\n   * This can either be a single pod / workload, or a grouping of pods selected\n   * via the `Pods.select` function. Rules is applied to any pods selected by this property.\n   * Multiple network policies can select the same set of pods.\n   * In this case, the rules for each are combined additively.\n   *\n   * Note that\n   *\n   * @default - will select all pods in the namespace of the policy.\n   */\n  readonly selector?: pod.IPodSelector;\n\n  /**\n   * Egress traffic configuration.\n   *\n   * @default - the policy doesn't change egress behavior of the pods it selects.\n   */\n  readonly egress?: NetworkPolicyTraffic;\n\n  /**\n   * Ingress traffic configuration.\n   *\n   * @default - the policy doesn't change ingress behavior of the pods it selects.\n   */\n  readonly ingress?: NetworkPolicyTraffic;\n}\n\n/**\n * Control traffic flow at the IP address or port level (OSI layer 3 or 4),\n * network policies are an application-centric construct which allow you\n * to specify how a pod is allowed to communicate with various network peers.\n *\n * - Outgoing traffic is allowed if there are no network policies selecting\n *   the pod (and cluster policy otherwise allows the traffic),\n *   OR if the traffic matches at least one egress rule across all of the\n *   network policies that select the pod.\n *\n * - Incoming traffic is allowed to a pod if there are no network policies\n *   selecting the pod (and cluster policy otherwise allows the traffic),\n *   OR if the traffic source is the pod's local node,\n *   OR if the traffic matches at least one ingress rule across all of\n *   the network policies that select the pod.\n *\n * Network policies do not conflict; they are additive.\n * If any policy or policies apply to a given pod for a given\n * direction, the connections allowed in that direction from\n * that pod is the union of what the applicable policies allow.\n * Thus, order of evaluation does not affect the policy result.\n *\n * For a connection from a source pod to a destination pod to be allowed,\n * both the egress policy on the source pod and the ingress policy on the\n * destination pod need to allow the connection.\n * If either side does not allow the connection, it will not happen.\n *\n * @see https://kubernetes.io/docs/concepts/services-networking/network-policies/#networkpolicy-resource\n */\nexport class NetworkPolicy extends base.Resource {\n\n  /**\n   * @see base.Resource.apiObject\n   */\n  protected readonly apiObject: ApiObject;\n\n  public readonly resourceType: string = 'networkpolicies';\n\n  private readonly _podSelectorConfig: pod.PodSelectorConfig;\n  private readonly _egressRules: k8s.NetworkPolicyEgressRule[] = [];\n  private readonly _ingressRules: k8s.NetworkPolicyIngressRule[] = [];\n  private readonly _policyTypes: Set<string> = new Set();\n\n  public constructor(scope: Construct, id: string, props: NetworkPolicyProps = {}) {\n    super(scope, id);\n\n    const podSelector = props.selector ?? pod.Pods.all(this, 'AllPods');\n    this._podSelectorConfig = podSelector.toPodSelectorConfig();\n\n    let ns;\n\n    if (!props.metadata?.namespace) {\n\n      if (this._podSelectorConfig.namespaces?.labelSelector && !this._podSelectorConfig.namespaces?.labelSelector.isEmpty()) {\n        throw new Error(`Unable to create a network policy for a selector (${podSelector.node.path}) that selects pods in namespaces based on labels`);\n      }\n\n      if (this._podSelectorConfig.namespaces?.names && this._podSelectorConfig.namespaces.names.length > 1) {\n        throw new Error(`Unable to create a network policy for a selector (${podSelector.node.path}) that selects pods in multiple namespaces`);\n      }\n\n      ns = this._podSelectorConfig.namespaces?.names ? this._podSelectorConfig.namespaces?.names[0] : undefined;\n\n    } else {\n      ns = props.metadata.namespace;\n    }\n\n    this.apiObject = new k8s.KubeNetworkPolicy(this, 'Resource', {\n      metadata: { ...props.metadata, namespace: ns },\n      spec: Lazy.any({ produce: () => this._toKube() }),\n    });\n\n    this.configureDefaultBehavior('Egress', props.egress?.default);\n    this.configureDefaultBehavior('Ingress', props.ingress?.default);\n\n    for (const rule of props.egress?.rules ?? []) {\n      this.addEgressRule(rule.peer, rule.ports);\n    }\n\n    for (const rule of props.ingress?.rules ?? []) {\n      this.addIngressRule(rule.peer, rule.ports);\n    }\n  }\n\n  /**\n   * Allow outgoing traffic to the peer.\n   *\n   * If ports are not passed, traffic will be allowed on all ports.\n   */\n  public addEgressRule(peer: INetworkPolicyPeer, ports?: NetworkPolicyPort[]) {\n    this._policyTypes.add('Egress');\n    this._egressRules.push({ ports: (ports ?? []).map(p => p._toKube()), to: this.createNetworkPolicyPeers(peer) });\n  }\n\n  /**\n   * Allow incoming traffic from the peer.\n   *\n   * If ports are not passed, traffic will be allowed on all ports.\n   */\n  public addIngressRule(peer: INetworkPolicyPeer, ports?: NetworkPolicyPort[]) {\n    this._policyTypes.add('Ingress');\n    this._ingressRules.push({ ports: (ports ?? []).map(p => p._toKube()), from: this.createNetworkPolicyPeers(peer) });\n  }\n\n  private createNetworkPolicyPeers(peer: INetworkPolicyPeer): k8s.NetworkPolicyPeer[] {\n\n    const config = peer.toNetworkPolicyPeerConfig();\n\n    validatePeerConfig(config);\n\n    if (config.ipBlock) {\n      // ip block is a single peer.\n      return [{ ipBlock: config.ipBlock._toKube() }];\n    }\n\n    if (!config.podSelector!.namespaces?.names) {\n      // when no explicit namespaces are defined we can just use\n      // the selector as is\n      return [{\n        namespaceSelector: config.podSelector!.namespaces?.labelSelector?._toKube(),\n        podSelector: config.podSelector!.labelSelector._toKube(),\n      }];\n    }\n\n    // when explicit namespaces are defined, we need to create a separate\n    // peer for each, since a label selector cannot have multiple name labels. (they will conflict)\n    const namespaceSelector = config.podSelector?.namespaces?.labelSelector?._toKube() ?? {};\n    return config.podSelector!.namespaces.names!.map(n => ({\n      podSelector: config.podSelector!.labelSelector._toKube(),\n      namespaceSelector: {\n        matchExpressions: namespaceSelector.matchExpressions,\n        matchLabels: {\n          ...namespaceSelector.matchLabels,\n          [namespace.Namespace.NAME_LABEL]: n,\n        },\n      },\n    }));\n  }\n\n  private configureDefaultBehavior(direction: 'Ingress' | 'Egress', _default?: NetworkPolicyTrafficDefault) {\n\n    if (!_default) { return;}\n\n    if (_default === NetworkPolicyTrafficDefault.DENY) {\n      // https://kubernetes.io/docs/concepts/services-networking/network-policies/#default-deny-all-egress-traffic\n      this._policyTypes.add(direction);\n    }\n\n    if (_default === NetworkPolicyTrafficDefault.ALLOW) {\n      // https://kubernetes.io/docs/concepts/services-networking/network-policies/#allow-all-egress-traffic\n      this._policyTypes.add(direction);\n      if (direction === 'Egress') {\n        this._egressRules.push({});\n      } else {\n        this._ingressRules.push({});\n      }\n    }\n  }\n\n  /**\n   * @internal\n   */\n  public _toKube(): k8s.NetworkPolicySpec {\n    return {\n      podSelector: this._podSelectorConfig.labelSelector._toKube(),\n      egress: undefinedIfEmpty(this._egressRules),\n      ingress: undefinedIfEmpty(this._ingressRules),\n      policyTypes: undefinedIfEmpty(Array.from(this._policyTypes)),\n    };\n  }\n\n}\n\nexport function validatePeerConfig(peerConfig: NetworkPolicyPeerConfig) {\n  if (!peerConfig.ipBlock && !peerConfig.podSelector) {\n    throw new Error('Inavlid peer: either \\'ipBlock\\' or \\'podSelector\\' must be defined');\n  }\n  if (peerConfig.ipBlock && peerConfig.podSelector) {\n    throw new Error('Inavlid peer: only one of \\'ipBlock\\' and \\'podSelector\\' must be defined');\n  }\n}\n"]}