@aws-cdk/aws-s3
Version:
The CDK Construct Library for AWS::S3
150 lines • 21.8 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BucketNotifications = void 0;
const iam = require("@aws-cdk/aws-iam");
const cdk = require("@aws-cdk/core");
const bucket_1 = require("../bucket");
const destination_1 = require("../destination");
const notifications_resource_handler_1 = require("./notifications-resource-handler");
// keep this import separate from other imports to reduce chance for merge conflicts with v2-main
// eslint-disable-next-line no-duplicate-imports, import/order
const core_1 = require("@aws-cdk/core");
/**
* A custom CloudFormation resource that updates bucket notifications for a
* bucket. The reason we need it is because the AWS::S3::Bucket notification
* configuration is defined on the bucket itself, which makes it impossible to
* provision notifications at the same time as the target (since
* PutBucketNotifications validates the targets).
*
* Since only a single BucketNotifications resource is allowed for each Bucket,
* this construct is not exported in the public API of this module. Instead, it
* is created just-in-time by `s3.Bucket.onEvent`, so a 1:1 relationship is
* ensured.
*
* @see
* https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket-notificationconfig.html
*/
class BucketNotifications extends core_1.Construct {
constructor(scope, id, props) {
super(scope, id);
this.eventBridgeEnabled = false;
this.lambdaNotifications = new Array();
this.queueNotifications = new Array();
this.topicNotifications = new Array();
this.bucket = props.bucket;
this.handlerRole = props.handlerRole;
}
/**
* Adds a notification subscription for this bucket.
* If this is the first notification, a BucketNotification resource is added to the stack.
*
* @param event The type of event
* @param target The target construct
* @param filters A set of S3 key filters
*/
addNotification(event, target, ...filters) {
const resource = this.createResourceOnce();
// resolve target. this also provides an opportunity for the target to e.g. update
// policies to allow this notification to happen.
const targetProps = target.bind(this, this.bucket);
const commonConfig = {
Events: [event],
Filter: renderFilters(filters),
};
// if the target specifies any dependencies, add them to the custom resource.
// for example, the SNS topic policy must be created /before/ the notification resource.
// otherwise, S3 won't be able to confirm the subscription.
if (targetProps.dependencies) {
resource.node.addDependency(...targetProps.dependencies);
}
// based on the target type, add the the correct configurations array
switch (targetProps.type) {
case destination_1.BucketNotificationDestinationType.LAMBDA:
this.lambdaNotifications.push({ ...commonConfig, LambdaFunctionArn: targetProps.arn });
break;
case destination_1.BucketNotificationDestinationType.QUEUE:
this.queueNotifications.push({ ...commonConfig, QueueArn: targetProps.arn });
break;
case destination_1.BucketNotificationDestinationType.TOPIC:
this.topicNotifications.push({ ...commonConfig, TopicArn: targetProps.arn });
break;
default:
throw new Error('Unsupported notification target type:' + destination_1.BucketNotificationDestinationType[targetProps.type]);
}
}
enableEventBridgeNotification() {
this.createResourceOnce();
this.eventBridgeEnabled = true;
}
renderNotificationConfiguration() {
return {
EventBridgeConfiguration: this.eventBridgeEnabled ? {} : undefined,
LambdaFunctionConfigurations: this.lambdaNotifications.length > 0 ? this.lambdaNotifications : undefined,
QueueConfigurations: this.queueNotifications.length > 0 ? this.queueNotifications : undefined,
TopicConfigurations: this.topicNotifications.length > 0 ? this.topicNotifications : undefined,
};
}
/**
* Defines the bucket notifications resources in the stack only once.
* This is called lazily as we add notifications, so that if notifications are not added,
* there is no notifications resource.
*/
createResourceOnce() {
if (!this.resource) {
const handler = notifications_resource_handler_1.NotificationsResourceHandler.singleton(this, {
role: this.handlerRole,
});
const managed = this.bucket instanceof bucket_1.Bucket;
if (!managed) {
handler.addToRolePolicy(new iam.PolicyStatement({
actions: ['s3:GetBucketNotification'],
resources: ['*'],
}));
}
this.resource = new cdk.CfnResource(this, 'Resource', {
type: 'Custom::S3BucketNotifications',
properties: {
ServiceToken: handler.functionArn,
BucketName: this.bucket.bucketName,
NotificationConfiguration: cdk.Lazy.any({ produce: () => this.renderNotificationConfiguration() }),
Managed: managed,
},
});
}
return this.resource;
}
}
exports.BucketNotifications = BucketNotifications;
function renderFilters(filters) {
if (!filters || filters.length === 0) {
return undefined;
}
const renderedRules = new Array();
let hasPrefix = false;
let hasSuffix = false;
for (const rule of filters) {
if (!rule.suffix && !rule.prefix) {
throw new Error('NotificationKeyFilter must specify `prefix` and/or `suffix`');
}
if (rule.suffix) {
if (hasSuffix) {
throw new Error('Cannot specify more than one suffix rule in a filter.');
}
renderedRules.push({ Name: 'suffix', Value: rule.suffix });
hasSuffix = true;
}
if (rule.prefix) {
if (hasPrefix) {
throw new Error('Cannot specify more than one prefix rule in a filter.');
}
renderedRules.push({ Name: 'prefix', Value: rule.prefix });
hasPrefix = true;
}
}
return {
Key: {
FilterRules: renderedRules,
},
};
}
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The reason we need it is because the AWS::S3::Bucket notification\n * configuration is defined on the bucket itself, which makes it impossible to\n * provision notifications at the same time as the target (since\n * PutBucketNotifications validates the targets).\n *\n * Since only a single BucketNotifications resource is allowed for each Bucket,\n * this construct is not exported in the public API of this module. Instead, it\n * is created just-in-time by `s3.Bucket.onEvent`, so a 1:1 relationship is\n * ensured.\n *\n * @see\n * https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket-notificationconfig.html\n */\nexport class BucketNotifications extends Construct {\n  private eventBridgeEnabled = false;\n  private readonly lambdaNotifications = new Array<LambdaFunctionConfiguration>();\n  private readonly queueNotifications = new Array<QueueConfiguration>();\n  private readonly topicNotifications = new Array<TopicConfiguration>();\n  private resource?: cdk.CfnResource;\n  private readonly bucket: IBucket;\n  private readonly handlerRole?: iam.IRole;\n\n  constructor(scope: Construct, id: string, props: NotificationsProps) {\n    super(scope, id);\n    this.bucket = props.bucket;\n    this.handlerRole = props.handlerRole;\n  }\n\n  /**\n   * Adds a notification subscription for this bucket.\n   * If this is the first notification, a BucketNotification resource is added to the stack.\n   *\n   * @param event The type of event\n   * @param target The target construct\n   * @param filters A set of S3 key filters\n   */\n  public addNotification(event: EventType, target: IBucketNotificationDestination, ...filters: NotificationKeyFilter[]) {\n    const resource = this.createResourceOnce();\n\n    // resolve target. this also provides an opportunity for the target to e.g. update\n    // policies to allow this notification to happen.\n    const targetProps = target.bind(this, this.bucket);\n    const commonConfig: CommonConfiguration = {\n      Events: [event],\n      Filter: renderFilters(filters),\n    };\n\n    // if the target specifies any dependencies, add them to the custom resource.\n    // for example, the SNS topic policy must be created /before/ the notification resource.\n    // otherwise, S3 won't be able to confirm the subscription.\n    if (targetProps.dependencies) {\n      resource.node.addDependency(...targetProps.dependencies);\n    }\n\n    // based on the target type, add the the correct configurations array\n    switch (targetProps.type) {\n      case BucketNotificationDestinationType.LAMBDA:\n        this.lambdaNotifications.push({ ...commonConfig, LambdaFunctionArn: targetProps.arn });\n        break;\n\n      case BucketNotificationDestinationType.QUEUE:\n        this.queueNotifications.push({ ...commonConfig, QueueArn: targetProps.arn });\n        break;\n\n      case BucketNotificationDestinationType.TOPIC:\n        this.topicNotifications.push({ ...commonConfig, TopicArn: targetProps.arn });\n        break;\n\n      default:\n        throw new Error('Unsupported notification target type:' + BucketNotificationDestinationType[targetProps.type]);\n    }\n  }\n\n  public enableEventBridgeNotification() {\n    this.createResourceOnce();\n    this.eventBridgeEnabled = true;\n  }\n\n  private renderNotificationConfiguration(): NotificationConfiguration {\n    return {\n      EventBridgeConfiguration: this.eventBridgeEnabled ? {} : undefined,\n      LambdaFunctionConfigurations: this.lambdaNotifications.length > 0 ? this.lambdaNotifications : undefined,\n      QueueConfigurations: this.queueNotifications.length > 0 ? this.queueNotifications : undefined,\n      TopicConfigurations: this.topicNotifications.length > 0 ? this.topicNotifications : undefined,\n    };\n  }\n\n  /**\n   * Defines the bucket notifications resources in the stack only once.\n   * This is called lazily as we add notifications, so that if notifications are not added,\n   * there is no notifications resource.\n   */\n  private createResourceOnce() {\n    if (!this.resource) {\n      const handler = NotificationsResourceHandler.singleton(this, {\n        role: this.handlerRole,\n      });\n\n      const managed = this.bucket instanceof Bucket;\n\n      if (!managed) {\n        handler.addToRolePolicy(new iam.PolicyStatement({\n          actions: ['s3:GetBucketNotification'],\n          resources: ['*'],\n        }));\n      }\n\n      this.resource = new cdk.CfnResource(this, 'Resource', {\n        type: 'Custom::S3BucketNotifications',\n        properties: {\n          ServiceToken: handler.functionArn,\n          BucketName: this.bucket.bucketName,\n          NotificationConfiguration: cdk.Lazy.any({ produce: () => this.renderNotificationConfiguration() }),\n          Managed: managed,\n        },\n      });\n    }\n\n    return this.resource;\n  }\n}\n\nfunction renderFilters(filters?: NotificationKeyFilter[]): Filter | undefined {\n  if (!filters || filters.length === 0) {\n    return undefined;\n  }\n\n  const renderedRules = new Array<FilterRule>();\n  let hasPrefix = false;\n  let hasSuffix = false;\n\n  for (const rule of filters) {\n    if (!rule.suffix && !rule.prefix) {\n      throw new Error('NotificationKeyFilter must specify `prefix` and/or `suffix`');\n    }\n\n    if (rule.suffix) {\n      if (hasSuffix) {\n        throw new Error('Cannot specify more than one suffix rule in a filter.');\n      }\n      renderedRules.push({ Name: 'suffix', Value: rule.suffix });\n      hasSuffix = true;\n    }\n\n    if (rule.prefix) {\n      if (hasPrefix) {\n        throw new Error('Cannot specify more than one prefix rule in a filter.');\n      }\n      renderedRules.push({ Name: 'prefix', Value: rule.prefix });\n      hasPrefix = true;\n    }\n  }\n\n  return {\n    Key: {\n      FilterRules: renderedRules,\n    },\n  };\n}\n\ninterface NotificationConfiguration {\n  EventBridgeConfiguration?: EventBridgeConfiguration;\n  LambdaFunctionConfigurations?: LambdaFunctionConfiguration[];\n  QueueConfigurations?: QueueConfiguration[];\n  TopicConfigurations?: TopicConfiguration[];\n}\n\ninterface CommonConfiguration {\n  Id?: string;\n  Events: EventType[];\n  Filter?: Filter\n}\n\ninterface EventBridgeConfiguration { }\n\ninterface LambdaFunctionConfiguration extends CommonConfiguration {\n  LambdaFunctionArn: string;\n}\n\ninterface QueueConfiguration extends CommonConfiguration {\n  QueueArn: string;\n}\n\ninterface TopicConfiguration extends CommonConfiguration {\n  TopicArn: string;\n}\n\ninterface FilterRule {\n  Name: 'prefix' | 'suffix';\n  Value: string;\n}\n\ninterface Filter {\n  Key: { FilterRules: FilterRule[] }\n}\n"]}