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1"use strict";
2var _a;
3Object.defineProperty(exports, "__esModule", { value: true });
4exports.Rule = void 0;
5const jsiiDeprecationWarnings = require("../.warnings.jsii.js");
6const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
7const aws_iam_1 = require("@aws-cdk/aws-iam");
8const core_1 = require("@aws-cdk/core");
9const constructs_1 = require("constructs");
10const events_generated_1 = require("./events.generated");
11const schedule_1 = require("./schedule");
12const util_1 = require("./util");
13/**
14 * Defines an EventBridge Rule in this stack.
15 *
16 * @resource AWS::Events::Rule
17 */
18class Rule extends core_1.Resource {
19 constructor(scope, id, props = {}) {
20 super(scope, id, {
21 physicalName: props.ruleName,
22 });
23 this.targets = new Array();
24 this.eventPattern = {};
25 /** Set to keep track of what target accounts and regions we've already created event buses for */
26 this._xEnvTargetsAdded = new Set();
27 try {
28 jsiiDeprecationWarnings._aws_cdk_aws_events_RuleProps(props);
29 }
30 catch (error) {
31 if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
32 Error.captureStackTrace(error, Rule);
33 }
34 throw error;
35 }
36 if (props.eventBus && props.schedule) {
37 throw new Error('Cannot associate rule with \'eventBus\' when using \'schedule\'');
38 }
39 this.description = props.description;
40 this.scheduleExpression = props.schedule?.expressionString;
41 // add a warning on synth when minute is not defined in a cron schedule
42 props.schedule?._bind(this);
43 const resource = new events_generated_1.CfnRule(this, 'Resource', {
44 name: this.physicalName,
45 description: this.description,
46 state: props.enabled == null ? 'ENABLED' : (props.enabled ? 'ENABLED' : 'DISABLED'),
47 scheduleExpression: this.scheduleExpression,
48 eventPattern: core_1.Lazy.any({ produce: () => this._renderEventPattern() }),
49 targets: core_1.Lazy.any({ produce: () => this.renderTargets() }),
50 eventBusName: props.eventBus && props.eventBus.eventBusName,
51 });
52 this.ruleArn = this.getResourceArnAttribute(resource.attrArn, {
53 service: 'events',
54 resource: 'rule',
55 resourceName: this.physicalName,
56 });
57 this.ruleName = this.getResourceNameAttribute(resource.ref);
58 this.addEventPattern(props.eventPattern);
59 for (const target of props.targets || []) {
60 this.addTarget(target);
61 }
62 }
63 /**
64 * Import an existing EventBridge Rule provided an ARN
65 *
66 * @param scope The parent creating construct (usually `this`).
67 * @param id The construct's name.
68 * @param eventRuleArn Event Rule ARN (i.e. arn:aws:events:<region>:<account-id>:rule/MyScheduledRule).
69 */
70 static fromEventRuleArn(scope, id, eventRuleArn) {
71 const parts = core_1.Stack.of(scope).splitArn(eventRuleArn, core_1.ArnFormat.SLASH_RESOURCE_NAME);
72 class Import extends core_1.Resource {
73 constructor() {
74 super(...arguments);
75 this.ruleArn = eventRuleArn;
76 this.ruleName = parts.resourceName || '';
77 }
78 }
79 return new Import(scope, id);
80 }
81 /**
82 * Adds a target to the rule. The abstract class RuleTarget can be extended to define new
83 * targets.
84 *
85 * No-op if target is undefined.
86 */
87 addTarget(target) {
88 try {
89 jsiiDeprecationWarnings._aws_cdk_aws_events_IRuleTarget(target);
90 }
91 catch (error) {
92 if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
93 Error.captureStackTrace(error, this.addTarget);
94 }
95 throw error;
96 }
97 if (!target) {
98 return;
99 }
100 // Simply increment id for each `addTarget` call. This is guaranteed to be unique.
101 const autoGeneratedId = `Target${this.targets.length}`;
102 const targetProps = target.bind(this, autoGeneratedId);
103 const inputProps = targetProps.input && targetProps.input.bind(this);
104 const roleArn = targetProps.role?.roleArn;
105 const id = targetProps.id || autoGeneratedId;
106 if (targetProps.targetResource) {
107 const targetStack = core_1.Stack.of(targetProps.targetResource);
108 const targetAccount = targetProps.targetResource.env?.account || targetStack.account;
109 const targetRegion = targetProps.targetResource.env?.region || targetStack.region;
110 const sourceStack = core_1.Stack.of(this);
111 const sourceAccount = sourceStack.account;
112 const sourceRegion = sourceStack.region;
113 // if the target is in a different account or region and is defined in this CDK App
114 // we can generate all the needed components:
115 // - forwarding rule in the source stack (target: default event bus of the receiver region)
116 // - eventbus permissions policy (creating an extra stack)
117 // - receiver rule in the target stack (target: the actual target)
118 if (!util_1.sameEnvDimension(sourceAccount, targetAccount) || !util_1.sameEnvDimension(sourceRegion, targetRegion)) {
119 // cross-account and/or cross-region event - strap in, this works differently than regular events!
120 // based on:
121 // https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-cross-account.html
122 // for cross-account or cross-region events, we require a concrete target account and region
123 if (!targetAccount || core_1.Token.isUnresolved(targetAccount)) {
124 throw new Error('You need to provide a concrete account for the target stack when using cross-account or cross-region events');
125 }
126 if (!targetRegion || core_1.Token.isUnresolved(targetRegion)) {
127 throw new Error('You need to provide a concrete region for the target stack when using cross-account or cross-region events');
128 }
129 if (core_1.Token.isUnresolved(sourceAccount)) {
130 throw new Error('You need to provide a concrete account for the source stack when using cross-account or cross-region events');
131 }
132 // Don't exactly understand why this code was here (seems unlikely this rule would be violated), but
133 // let's leave it in nonetheless.
134 const sourceApp = this.node.root;
135 if (!sourceApp || !core_1.App.isApp(sourceApp)) {
136 throw new Error('Event stack which uses cross-account or cross-region targets must be part of a CDK app');
137 }
138 const targetApp = constructs_1.Node.of(targetProps.targetResource).root;
139 if (!targetApp || !core_1.App.isApp(targetApp)) {
140 throw new Error('Target stack which uses cross-account or cross-region event targets must be part of a CDK app');
141 }
142 if (sourceApp !== targetApp) {
143 throw new Error('Event stack and target stack must belong to the same CDK app');
144 }
145 // The target of this Rule will be the default event bus of the target environment
146 this.ensureXEnvTargetEventBus(targetStack, targetAccount, targetRegion, id);
147 // The actual rule lives in the target stack. Other than the account, it's identical to this one,
148 // but only evaluated at render time (via a special subclass).
149 //
150 // FIXME: the MirrorRule is a bit silly, forwarding the exact same event to another event bus
151 // and trigger on it there (there will be issues with construct references, for example). Especially
152 // in the case of scheduled events, we will just trigger both rules in parallel in both environments.
153 //
154 // A better solution would be to have the source rule add a unique token to the the event,
155 // and have the mirror rule trigger on that token only (thereby properly separating triggering, which
156 // happens in the source env; and activating, which happens in the target env).
157 //
158 // Don't have time to do that right now.
159 const mirrorRuleScope = this.obtainMirrorRuleScope(targetStack, targetAccount, targetRegion);
160 new MirrorRule(mirrorRuleScope, `${core_1.Names.uniqueId(this)}-${id}`, {
161 targets: [target],
162 eventPattern: this.eventPattern,
163 schedule: this.scheduleExpression ? schedule_1.Schedule.expression(this.scheduleExpression) : undefined,
164 description: this.description,
165 }, this);
166 return;
167 }
168 }
169 // Here only if the target does not have a targetResource defined.
170 // In such case we don't have to generate any extra component.
171 // Note that this can also be an imported resource (i.e: EventBus target)
172 this.targets.push({
173 id,
174 arn: targetProps.arn,
175 roleArn,
176 ecsParameters: targetProps.ecsParameters,
177 httpParameters: targetProps.httpParameters,
178 kinesisParameters: targetProps.kinesisParameters,
179 runCommandParameters: targetProps.runCommandParameters,
180 batchParameters: targetProps.batchParameters,
181 deadLetterConfig: targetProps.deadLetterConfig,
182 retryPolicy: targetProps.retryPolicy,
183 sqsParameters: targetProps.sqsParameters,
184 input: inputProps && inputProps.input,
185 inputPath: inputProps && inputProps.inputPath,
186 inputTransformer: inputProps?.inputTemplate !== undefined ? {
187 inputTemplate: inputProps.inputTemplate,
188 inputPathsMap: inputProps.inputPathsMap,
189 } : undefined,
190 });
191 }
192 /**
193 * Adds an event pattern filter to this rule. If a pattern was already specified,
194 * these values are merged into the existing pattern.
195 *
196 * For example, if the rule already contains the pattern:
197 *
198 * {
199 * "resources": [ "r1" ],
200 * "detail": {
201 * "hello": [ 1 ]
202 * }
203 * }
204 *
205 * And `addEventPattern` is called with the pattern:
206 *
207 * {
208 * "resources": [ "r2" ],
209 * "detail": {
210 * "foo": [ "bar" ]
211 * }
212 * }
213 *
214 * The resulting event pattern will be:
215 *
216 * {
217 * "resources": [ "r1", "r2" ],
218 * "detail": {
219 * "hello": [ 1 ],
220 * "foo": [ "bar" ]
221 * }
222 * }
223 *
224 */
225 addEventPattern(eventPattern) {
226 try {
227 jsiiDeprecationWarnings._aws_cdk_aws_events_EventPattern(eventPattern);
228 }
229 catch (error) {
230 if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") {
231 Error.captureStackTrace(error, this.addEventPattern);
232 }
233 throw error;
234 }
235 if (!eventPattern) {
236 return;
237 }
238 util_1.mergeEventPattern(this.eventPattern, eventPattern);
239 }
240 /**
241 * Not private only to be overrideen in CopyRule.
242 *
243 * @internal
244 */
245 _renderEventPattern() {
246 return util_1.renderEventPattern(this.eventPattern);
247 }
248 validate() {
249 if (Object.keys(this.eventPattern).length === 0 && !this.scheduleExpression) {
250 return ['Either \'eventPattern\' or \'schedule\' must be defined'];
251 }
252 return [];
253 }
254 renderTargets() {
255 if (this.targets.length === 0) {
256 return undefined;
257 }
258 return this.targets;
259 }
260 /**
261 * Make sure we add the target environments event bus as a target, and the target has permissions set up to receive our events
262 *
263 * For cross-account rules, uses a support stack to set up a policy on the target event bus.
264 */
265 ensureXEnvTargetEventBus(targetStack, targetAccount, targetRegion, id) {
266 // the _actual_ target is just the event bus of the target's account
267 // make sure we only add it once per account per region
268 const key = `${targetAccount}:${targetRegion}`;
269 if (this._xEnvTargetsAdded.has(key)) {
270 return;
271 }
272 this._xEnvTargetsAdded.add(key);
273 const eventBusArn = targetStack.formatArn({
274 service: 'events',
275 resource: 'event-bus',
276 resourceName: 'default',
277 region: targetRegion,
278 account: targetAccount,
279 });
280 // For some reason, cross-region requires a Role (with `PutEvents` on the
281 // target event bus) while cross-account doesn't
282 const roleArn = !util_1.sameEnvDimension(targetRegion, core_1.Stack.of(this).region)
283 ? this.crossRegionPutEventsRole(eventBusArn).roleArn
284 : undefined;
285 this.targets.push({
286 id,
287 arn: eventBusArn,
288 roleArn,
289 });
290 // Add a policy to the target Event Bus to allow the source account/region to publish into it.
291 //
292 // Since this Event Bus permission needs to be deployed before the stack containing the Rule is deployed
293 // (as EventBridge verifies whether you have permissions to the targets on rule creation), this needs
294 // to be in a support stack.
295 const sourceApp = this.node.root;
296 const sourceAccount = core_1.Stack.of(this).account;
297 // If different accounts, we need to add the permissions to the target eventbus
298 //
299 // For different region, no need for a policy on the target event bus (but a need
300 // for a role).
301 if (!util_1.sameEnvDimension(sourceAccount, targetAccount)) {
302 const stackId = `EventBusPolicy-${sourceAccount}-${targetRegion}-${targetAccount}`;
303 let eventBusPolicyStack = sourceApp.node.tryFindChild(stackId);
304 if (!eventBusPolicyStack) {
305 eventBusPolicyStack = new core_1.Stack(sourceApp, stackId, {
306 env: {
307 account: targetAccount,
308 region: targetRegion,
309 },
310 // The region in the stack name is rather redundant (it will always be the target region)
311 // Leaving it in for backwards compatibility.
312 stackName: `${targetStack.stackName}-EventBusPolicy-support-${targetRegion}-${sourceAccount}`,
313 });
314 new events_generated_1.CfnEventBusPolicy(eventBusPolicyStack, 'GivePermToOtherAccount', {
315 action: 'events:PutEvents',
316 statementId: `Allow-account-${sourceAccount}-${this.node.addr}`,
317 principal: sourceAccount,
318 });
319 }
320 // deploy the event bus permissions before the source stack
321 core_1.Stack.of(this).addDependency(eventBusPolicyStack);
322 }
323 }
324 /**
325 * Return the scope where the mirror rule should be created for x-env event targets
326 *
327 * This is the target resource's containing stack if it shares the same region (owned
328 * resources), or should be a fresh support stack for imported resources.
329 *
330 * We don't implement the second yet, as I have to think long and hard on whether we
331 * can reuse the existing support stack or not, and I don't have time for that right now.
332 */
333 obtainMirrorRuleScope(targetStack, targetAccount, targetRegion) {
334 // for cross-account or cross-region events, we cannot create new components for an imported resource
335 // because we don't have the target stack
336 if (util_1.sameEnvDimension(targetStack.account, targetAccount) && util_1.sameEnvDimension(targetStack.region, targetRegion)) {
337 return targetStack;
338 }
339 // For now, we don't do the work for the support stack yet
340 throw new Error('Cannot create a cross-account or cross-region rule for an imported resource (create a stack with the right environment for the imported resource)');
341 }
342 /**
343 * Obtain the Role for the EventBridge event
344 *
345 * If a role already exists, it will be returned. This ensures that if multiple
346 * events have the same target, they will share a role.
347 * @internal
348 */
349 crossRegionPutEventsRole(eventBusArn) {
350 const id = 'EventsRole';
351 let role = this.node.tryFindChild(id);
352 if (!role) {
353 role = new aws_iam_1.Role(this, id, {
354 roleName: core_1.PhysicalName.GENERATE_IF_NEEDED,
355 assumedBy: new aws_iam_1.ServicePrincipal('events.amazonaws.com'),
356 });
357 }
358 role.addToPrincipalPolicy(new aws_iam_1.PolicyStatement({
359 actions: ['events:PutEvents'],
360 resources: [eventBusArn],
361 }));
362 return role;
363 }
364}
365exports.Rule = Rule;
366_a = JSII_RTTI_SYMBOL_1;
367Rule[_a] = { fqn: "@aws-cdk/aws-events.Rule", version: "1.191.0" };
368/**
369 * A rule that mirrors another rule
370 */
371class MirrorRule extends Rule {
372 constructor(scope, id, props, source) {
373 super(scope, id, props);
374 this.source = source;
375 }
376 _renderEventPattern() {
377 return this.source._renderEventPattern();
378 }
379 /**
380 * Override validate to be a no-op
381 *
382 * The rules are never stored on this object so there's nothing to validate.
383 *
384 * Instead, we mirror the other rule at render time.
385 */
386 validate() {
387 return [];
388 }
389}
390//# 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{ IRole, PolicyStatement, Role, ServicePrincipal } from '@aws-cdk/aws-iam';\nimport { App, IResource, Lazy, Names, Resource, Stack, Token, PhysicalName, ArnFormat } from '@aws-cdk/core';\nimport { Node, Construct } from 'constructs';\nimport { IEventBus } from './event-bus';\nimport { EventPattern } from './event-pattern';\nimport { CfnEventBusPolicy, CfnRule } from './events.generated';\nimport { IRule } from './rule-ref';\nimport { Schedule } from './schedule';\nimport { IRuleTarget } from './target';\nimport { mergeEventPattern, renderEventPattern, sameEnvDimension } from './util';\n\n/**\n * Properties for defining an EventBridge Rule\n */\nexport interface RuleProps {\n  /**\n   * A description of the rule's purpose.\n   *\n   * @default - No description.\n   */\n  readonly description?: string;\n\n  /**\n   * A name for the rule.\n   *\n   * @default - AWS CloudFormation generates a unique physical ID and uses that ID\n   * for the rule name. For more information, see Name Type.\n   */\n  readonly ruleName?: string;\n\n  /**\n   * Indicates whether the rule is enabled.\n   *\n   * @default true\n   */\n  readonly enabled?: boolean;\n\n  /**\n   * The schedule or rate (frequency) that determines when EventBridge\n   * runs the rule. For more information, see Schedule Expression Syntax for\n   * Rules in the Amazon EventBridge User Guide.\n   *\n   * @see https://docs.aws.amazon.com/eventbridge/latest/userguide/scheduled-events.html\n   *\n   * You must specify this property, the `eventPattern` property, or both.\n   *\n   * @default - None.\n   */\n  readonly schedule?: Schedule;\n\n  /**\n   * Describes which events EventBridge routes to the specified target.\n   * These routed events are matched events. For more information, see Events\n   * and Event Patterns in the Amazon EventBridge User Guide.\n   *\n   * @see\n   * https://docs.aws.amazon.com/eventbridge/latest/userguide/eventbridge-and-event-patterns.html\n   *\n   * You must specify this property (either via props or via\n   * `addEventPattern`), the `scheduleExpression` property, or both. The\n   * method `addEventPattern` can be used to add filter values to the event\n   * pattern.\n   *\n   * @default - None.\n   */\n  readonly eventPattern?: EventPattern;\n\n  /**\n   * Targets to invoke when this rule matches an event.\n   *\n   * Input will be the full matched event. If you wish to specify custom\n   * target input, use `addTarget(target[, inputOptions])`.\n   *\n   * @default - No targets.\n   */\n  readonly targets?: IRuleTarget[];\n\n  /**\n   * The event bus to associate with this rule.\n   *\n   * @default - The default event bus.\n   */\n  readonly eventBus?: IEventBus;\n}\n\n/**\n * Defines an EventBridge Rule in this stack.\n *\n * @resource AWS::Events::Rule\n */\nexport class Rule extends Resource implements IRule {\n\n  /**\n   * Import an existing EventBridge Rule provided an ARN\n   *\n   * @param scope The parent creating construct (usually `this`).\n   * @param id The construct's name.\n   * @param eventRuleArn Event Rule ARN (i.e. arn:aws:events:<region>:<account-id>:rule/MyScheduledRule).\n   */\n  public static fromEventRuleArn(scope: Construct, id: string, eventRuleArn: string): IRule {\n    const parts = Stack.of(scope).splitArn(eventRuleArn, ArnFormat.SLASH_RESOURCE_NAME);\n\n    class Import extends Resource implements IRule {\n      public ruleArn = eventRuleArn;\n      public ruleName = parts.resourceName || '';\n    }\n    return new Import(scope, id);\n  }\n\n  public readonly ruleArn: string;\n  public readonly ruleName: string;\n\n  private readonly targets = new Array<CfnRule.TargetProperty>();\n  private readonly eventPattern: EventPattern = { };\n  private readonly scheduleExpression?: string;\n  private readonly description?: string;\n\n  /** Set to keep track of what target accounts and regions we've already created event buses for */\n  private readonly _xEnvTargetsAdded = new Set<string>();\n\n  constructor(scope: Construct, id: string, props: RuleProps = { }) {\n    super(scope, id, {\n      physicalName: props.ruleName,\n    });\n\n    if (props.eventBus && props.schedule) {\n      throw new Error('Cannot associate rule with \\'eventBus\\' when using \\'schedule\\'');\n    }\n\n    this.description = props.description;\n    this.scheduleExpression = props.schedule?.expressionString;\n\n    // add a warning on synth when minute is not defined in a cron schedule\n    props.schedule?._bind(this);\n\n    const resource = new CfnRule(this, 'Resource', {\n      name: this.physicalName,\n      description: this.description,\n      state: props.enabled == null ? 'ENABLED' : (props.enabled ? 'ENABLED' : 'DISABLED'),\n      scheduleExpression: this.scheduleExpression,\n      eventPattern: Lazy.any({ produce: () => this._renderEventPattern() }),\n      targets: Lazy.any({ produce: () => this.renderTargets() }),\n      eventBusName: props.eventBus && props.eventBus.eventBusName,\n    });\n\n    this.ruleArn = this.getResourceArnAttribute(resource.attrArn, {\n      service: 'events',\n      resource: 'rule',\n      resourceName: this.physicalName,\n    });\n    this.ruleName = this.getResourceNameAttribute(resource.ref);\n\n    this.addEventPattern(props.eventPattern);\n\n    for (const target of props.targets || []) {\n      this.addTarget(target);\n    }\n  }\n\n  /**\n   * Adds a target to the rule. The abstract class RuleTarget can be extended to define new\n   * targets.\n   *\n   * No-op if target is undefined.\n   */\n  public addTarget(target?: IRuleTarget): void {\n    if (!target) { return; }\n\n    // Simply increment id for each `addTarget` call. This is guaranteed to be unique.\n    const autoGeneratedId = `Target${this.targets.length}`;\n\n    const targetProps = target.bind(this, autoGeneratedId);\n    const inputProps = targetProps.input && targetProps.input.bind(this);\n\n    const roleArn = targetProps.role?.roleArn;\n    const id = targetProps.id || autoGeneratedId;\n\n    if (targetProps.targetResource) {\n      const targetStack = Stack.of(targetProps.targetResource);\n\n      const targetAccount = (targetProps.targetResource as IResource).env?.account || targetStack.account;\n      const targetRegion = (targetProps.targetResource as IResource).env?.region || targetStack.region;\n\n      const sourceStack = Stack.of(this);\n      const sourceAccount = sourceStack.account;\n      const sourceRegion = sourceStack.region;\n\n      // if the target is in a different account or region and is defined in this CDK App\n      // we can generate all the needed components:\n      // - forwarding rule in the source stack (target: default event bus of the receiver region)\n      // - eventbus permissions policy (creating an extra stack)\n      // - receiver rule in the target stack (target: the actual target)\n      if (!sameEnvDimension(sourceAccount, targetAccount) || !sameEnvDimension(sourceRegion, targetRegion)) {\n        // cross-account and/or cross-region event - strap in, this works differently than regular events!\n        // based on:\n        // https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-cross-account.html\n\n        // for cross-account or cross-region events, we require a concrete target account and region\n        if (!targetAccount || Token.isUnresolved(targetAccount)) {\n          throw new Error('You need to provide a concrete account for the target stack when using cross-account or cross-region events');\n        }\n        if (!targetRegion || Token.isUnresolved(targetRegion)) {\n          throw new Error('You need to provide a concrete region for the target stack when using cross-account or cross-region events');\n        }\n        if (Token.isUnresolved(sourceAccount)) {\n          throw new Error('You need to provide a concrete account for the source stack when using cross-account or cross-region events');\n        }\n\n        // Don't exactly understand why this code was here (seems unlikely this rule would be violated), but\n        // let's leave it in nonetheless.\n        const sourceApp = this.node.root;\n        if (!sourceApp || !App.isApp(sourceApp)) {\n          throw new Error('Event stack which uses cross-account or cross-region targets must be part of a CDK app');\n        }\n        const targetApp = Node.of(targetProps.targetResource).root;\n        if (!targetApp || !App.isApp(targetApp)) {\n          throw new Error('Target stack which uses cross-account or cross-region event targets must be part of a CDK app');\n        }\n        if (sourceApp !== targetApp) {\n          throw new Error('Event stack and target stack must belong to the same CDK app');\n        }\n\n        // The target of this Rule will be the default event bus of the target environment\n        this.ensureXEnvTargetEventBus(targetStack, targetAccount, targetRegion, id);\n\n        // The actual rule lives in the target stack. Other than the account, it's identical to this one,\n        // but only evaluated at render time (via a special subclass).\n        //\n        // FIXME: the MirrorRule is a bit silly, forwarding the exact same event to another event bus\n        // and trigger on it there (there will be issues with construct references, for example). Especially\n        // in the case of scheduled events, we will just trigger both rules in parallel in both environments.\n        //\n        // A better solution would be to have the source rule add a unique token to the the event,\n        // and have the mirror rule trigger on that token only (thereby properly separating triggering, which\n        // happens in the source env; and activating, which happens in the target env).\n        //\n        // Don't have time to do that right now.\n        const mirrorRuleScope = this.obtainMirrorRuleScope(targetStack, targetAccount, targetRegion);\n        new MirrorRule(mirrorRuleScope, `${Names.uniqueId(this)}-${id}`, {\n          targets: [target],\n          eventPattern: this.eventPattern,\n          schedule: this.scheduleExpression ? Schedule.expression(this.scheduleExpression) : undefined,\n          description: this.description,\n        }, this);\n\n        return;\n      }\n    }\n\n    // Here only if the target does not have a targetResource defined.\n    // In such case we don't have to generate any extra component.\n    // Note that this can also be an imported resource (i.e: EventBus target)\n\n    this.targets.push({\n      id,\n      arn: targetProps.arn,\n      roleArn,\n      ecsParameters: targetProps.ecsParameters,\n      httpParameters: targetProps.httpParameters,\n      kinesisParameters: targetProps.kinesisParameters,\n      runCommandParameters: targetProps.runCommandParameters,\n      batchParameters: targetProps.batchParameters,\n      deadLetterConfig: targetProps.deadLetterConfig,\n      retryPolicy: targetProps.retryPolicy,\n      sqsParameters: targetProps.sqsParameters,\n      input: inputProps && inputProps.input,\n      inputPath: inputProps && inputProps.inputPath,\n      inputTransformer: inputProps?.inputTemplate !== undefined ? {\n        inputTemplate: inputProps.inputTemplate,\n        inputPathsMap: inputProps.inputPathsMap,\n      } : undefined,\n    });\n  }\n\n  /**\n   * Adds an event pattern filter to this rule. If a pattern was already specified,\n   * these values are merged into the existing pattern.\n   *\n   * For example, if the rule already contains the pattern:\n   *\n   *    {\n   *      \"resources\": [ \"r1\" ],\n   *      \"detail\": {\n   *        \"hello\": [ 1 ]\n   *      }\n   *    }\n   *\n   * And `addEventPattern` is called with the pattern:\n   *\n   *    {\n   *      \"resources\": [ \"r2\" ],\n   *      \"detail\": {\n   *        \"foo\": [ \"bar\" ]\n   *      }\n   *    }\n   *\n   * The resulting event pattern will be:\n   *\n   *    {\n   *      \"resources\": [ \"r1\", \"r2\" ],\n   *      \"detail\": {\n   *        \"hello\": [ 1 ],\n   *        \"foo\": [ \"bar\" ]\n   *      }\n   *    }\n   *\n   */\n  public addEventPattern(eventPattern?: EventPattern) {\n    if (!eventPattern) {\n      return;\n    }\n    mergeEventPattern(this.eventPattern, eventPattern);\n  }\n\n  /**\n   * Not private only to be overrideen in CopyRule.\n   *\n   * @internal\n   */\n  public _renderEventPattern(): any {\n    return renderEventPattern(this.eventPattern);\n  }\n\n  protected validate() {\n    if (Object.keys(this.eventPattern).length === 0 && !this.scheduleExpression) {\n      return ['Either \\'eventPattern\\' or \\'schedule\\' must be defined'];\n    }\n\n    return [];\n  }\n\n  private renderTargets() {\n    if (this.targets.length === 0) {\n      return undefined;\n    }\n\n    return this.targets;\n  }\n\n  /**\n   * Make sure we add the target environments event bus as a target, and the target has permissions set up to receive our events\n   *\n   * For cross-account rules, uses a support stack to set up a policy on the target event bus.\n   */\n  private ensureXEnvTargetEventBus(targetStack: Stack, targetAccount: string, targetRegion: string, id: string) {\n    // the _actual_ target is just the event bus of the target's account\n    // make sure we only add it once per account per region\n    const key = `${targetAccount}:${targetRegion}`;\n    if (this._xEnvTargetsAdded.has(key)) { return; }\n    this._xEnvTargetsAdded.add(key);\n\n    const eventBusArn = targetStack.formatArn({\n      service: 'events',\n      resource: 'event-bus',\n      resourceName: 'default',\n      region: targetRegion,\n      account: targetAccount,\n    });\n\n    // For some reason, cross-region requires a Role (with `PutEvents` on the\n    // target event bus) while cross-account doesn't\n    const roleArn = !sameEnvDimension(targetRegion, Stack.of(this).region)\n      ? this.crossRegionPutEventsRole(eventBusArn).roleArn\n      : undefined;\n\n    this.targets.push({\n      id,\n      arn: eventBusArn,\n      roleArn,\n    });\n\n    // Add a policy to the target Event Bus to allow the source account/region to publish into it.\n    //\n    // Since this Event Bus permission needs to be deployed before the stack containing the Rule is deployed\n    // (as EventBridge verifies whether you have permissions to the targets on rule creation), this needs\n    // to be in a support stack.\n\n    const sourceApp = this.node.root as App;\n    const sourceAccount = Stack.of(this).account;\n\n    // If different accounts, we need to add the permissions to the target eventbus\n    //\n    // For different region, no need for a policy on the target event bus (but a need\n    // for a role).\n    if (!sameEnvDimension(sourceAccount, targetAccount)) {\n      const stackId = `EventBusPolicy-${sourceAccount}-${targetRegion}-${targetAccount}`;\n      let eventBusPolicyStack: Stack = sourceApp.node.tryFindChild(stackId) as Stack;\n      if (!eventBusPolicyStack) {\n        eventBusPolicyStack = new Stack(sourceApp, stackId, {\n          env: {\n            account: targetAccount,\n            region: targetRegion,\n          },\n          // The region in the stack name is rather redundant (it will always be the target region)\n          // Leaving it in for backwards compatibility.\n          stackName: `${targetStack.stackName}-EventBusPolicy-support-${targetRegion}-${sourceAccount}`,\n        });\n        new CfnEventBusPolicy(eventBusPolicyStack, 'GivePermToOtherAccount', {\n          action: 'events:PutEvents',\n          statementId: `Allow-account-${sourceAccount}-${this.node.addr}`,\n          principal: sourceAccount,\n        });\n      }\n      // deploy the event bus permissions before the source stack\n      Stack.of(this).addDependency(eventBusPolicyStack);\n    }\n  }\n\n  /**\n   * Return the scope where the mirror rule should be created for x-env event targets\n   *\n   * This is the target resource's containing stack if it shares the same region (owned\n   * resources), or should be a fresh support stack for imported resources.\n   *\n   * We don't implement the second yet, as I have to think long and hard on whether we\n   * can reuse the existing support stack or not, and I don't have time for that right now.\n   */\n  private obtainMirrorRuleScope(targetStack: Stack, targetAccount: string, targetRegion: string): Construct {\n    // for cross-account or cross-region events, we cannot create new components for an imported resource\n    // because we don't have the target stack\n    if (sameEnvDimension(targetStack.account, targetAccount) && sameEnvDimension(targetStack.region, targetRegion)) {\n      return targetStack;\n    }\n\n    // For now, we don't do the work for the support stack yet\n    throw new Error('Cannot create a cross-account or cross-region rule for an imported resource (create a stack with the right environment for the imported resource)');\n  }\n\n  /**\n   * Obtain the Role for the EventBridge event\n   *\n   * If a role already exists, it will be returned. This ensures that if multiple\n   * events have the same target, they will share a role.\n   * @internal\n   */\n  private crossRegionPutEventsRole(eventBusArn: string): IRole {\n    const id = 'EventsRole';\n    let role = this.node.tryFindChild(id) as IRole;\n    if (!role) {\n      role = new Role(this, id, {\n        roleName: PhysicalName.GENERATE_IF_NEEDED,\n        assumedBy: new ServicePrincipal('events.amazonaws.com'),\n      });\n    }\n\n    role.addToPrincipalPolicy(new PolicyStatement({\n      actions: ['events:PutEvents'],\n      resources: [eventBusArn],\n    }));\n\n    return role;\n  }\n}\n\n/**\n * A rule that mirrors another rule\n */\nclass MirrorRule extends Rule {\n  constructor(scope: Construct, id: string, props: RuleProps, private readonly source: Rule) {\n    super(scope, id, props);\n  }\n\n  public _renderEventPattern(): any {\n    return this.source._renderEventPattern();\n  }\n\n  /**\n   * Override validate to be a no-op\n   *\n   * The rules are never stored on this object so there's nothing to validate.\n   *\n   * Instead, we mirror the other rule at render time.\n   */\n  protected validate(): string[] {\n    return [];\n  }\n}\n"]}
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