Bucket Notifications

packages/@aws-cdk/aws-s3/README.md

@@ -143,3 +143,40 @@ new Consumer(app, 'consume', {
 
 process.stdout.write(app.run());
 ```
+
+### Bucket Notifications
+
+The Amazon S3 notification feature enables you to receive notifications when
+certain events happen in your bucket as described under [S3 Bucket
+Notifications] of the S3 Developer Guide.
+
+To subscribe for bucket notifications, use the `bucket.onEvent` method. The
+`bucket.onObjectCreated` and `bucket.onObjectRemoved` can also be used for these
+common use cases.
+
+The following example will subscribe an SNS topic to be notified of all
+``s3:ObjectCreated:*` events:
+
+```ts
+const myTopic = new sns.Topic(this, 'MyTopic');
+bucket.onEvent(s3.EventType.ObjectCreated, myTopic);
+```
+
+This call will also ensure that the topic policy can accept notifications for
+this specific bucket.
+
+The following destinations are currently supported:
+
+ * `sns.Topic`
+ * `sqs.Queue`
+ * `lambda.Function`
+
+It is also possible to specify S3 object key filters when subscribing. The
+following example will notify `myQueue` when objects prefixed with `foo/` are
+deleted from the bucket.
+
+```ts
+bucket.onEvent(s3.EventType.ObjectRemoved, myQueue, 'foo/*')
+```
+
+[S3 Bucket Notifications]: https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html

packages/@aws-cdk/aws-s3/lib/bucket.ts

@@ -2,6 +2,8 @@ import iam = require('@aws-cdk/aws-iam');
 import kms = require('@aws-cdk/aws-kms');
 import cdk = require('@aws-cdk/cdk');
 import { BucketPolicy } from './bucket-policy';
+import { INotificationDestination } from './notification-dest';
+import { BucketNotifications } from './notifications-resource';
 import perms = require('./perms');
 import { LifecycleRule } from './rule';
 import { BucketArn, BucketDomainName, BucketDualStackDomainName, cloudformation } from './s3.generated';
@@ -289,6 +291,7 @@ export class Bucket extends BucketRef {
     protected autoCreatePolicy = true;
     private readonly lifecycleRules: LifecycleRule[] = [];
     private readonly versioned?: boolean;
+    private readonly notifications: BucketNotifications;
 
     constructor(parent: cdk.Construct, name: string, props: BucketProps = {}) {
         super(parent, name);
@@ -316,6 +319,10 @@ export class Bucket extends BucketRef {
 
         // Add all lifecycle rules
         (props.lifecycleRules || []).forEach(this.addLifecycleRule.bind(this));
+
+        // defines a BucketNotifications construct. Notice that an actual resource will only
+        // be added if there are notifications added, so we don't need to condition this.
+        this.notifications = new BucketNotifications(this, 'Notifications', { bucket: this });
     }
 
     /**
@@ -333,6 +340,47 @@ export class Bucket extends BucketRef {
         this.lifecycleRules.push(rule);
     }
 
+    /**
+     * Adds a bucket notification event target.
+     * @param event The event to trigger the notification
+     * @param dest The notification destination (Lambda, SNS Topic or SQS Queue)
+     *
+     * @param s3KeyFilters S3 filter rules to determine which objects trigger
+     * this event. Rules must include either a prefix asterisk ("*foo/bar") or
+     * suffix asterisk ("foo/bar*") to indicate if this is a prefix or a suffix
+     * rule.
+     *
+     * @example
+     *
+     *      bucket.onEvent(EventType.OnObjectCreated, myLambda, 'home/myusername/*')
+     *
+     * @see
+     * https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html
+     */
+    public onEvent(event: EventType, dest: INotificationDestination, ...s3KeyFilters: string[]) {
+        this.notifications.addNotification(event, dest, ...s3KeyFilters);
+    }
+
+    /**
+     * Subscribes a target to receive notificatins when an object is created in the bucket.
+     * This is identical to calling `onEvent(EventType.ObjectCreated)`.
+     * @param dest The notification destination (see onEvent)
+     * @param s3KeyFilters Filters (see onEvent)
+     */
+    public onObjectCreated(dest: INotificationDestination, ...s3KeyFilters: string[]) {
+        return this.onEvent(EventType.ObjectCreated, dest, ...s3KeyFilters);
+    }
+
+    /**
+     * Subscribes a target to receive notificatins when an object is removed from the bucket.
+     * This is identical to calling `onEvent(EventType.ObjectRemoved)`.
+     * @param dest The notification destination (see onEvent)
+     * @param s3KeyFilters Filters (see onEvent)
+     */
+    public onObjectRemoved(dest: INotificationDestination, ...s3KeyFilters: string[]) {
+        return this.onEvent(EventType.ObjectRemoved, dest, ...s3KeyFilters);
+    }
+
     /**
      * Set up key properties and return the Bucket encryption property from the
      * user's configuration.
@@ -485,6 +533,114 @@ export class S3Url extends cdk.Token {
 
 }
 
+/**
+ * Notification event types.
+ */
+export enum EventType {
+    /**
+     * Amazon S3 APIs such as PUT, POST, and COPY can create an object. Using
+     * these event types, you can enable notification when an object is created
+     * using a specific API, or you can use the s3:ObjectCreated:* event type to
+     * request notification regardless of the API that was used to create an
+     * object.
+     */
+    ObjectCreated = 's3:ObjectCreated:*',
+
+    /**
+     * Amazon S3 APIs such as PUT, POST, and COPY can create an object. Using
+     * these event types, you can enable notification when an object is created
+     * using a specific API, or you can use the s3:ObjectCreated:* event type to
+     * request notification regardless of the API that was used to create an
+     * object.
+     */
+    ObjectCreatedPut = 's3:ObjectCreated:Put',
+
+    /**
+     * Amazon S3 APIs such as PUT, POST, and COPY can create an object. Using
+     * these event types, you can enable notification when an object is created
+     * using a specific API, or you can use the s3:ObjectCreated:* event type to
+     * request notification regardless of the API that was used to create an
+     * object.
+     */
+    ObjectCreatedPost = 's3:ObjectCreated:Post',
+
+    /**
+     * Amazon S3 APIs such as PUT, POST, and COPY can create an object. Using
+     * these event types, you can enable notification when an object is created
+     * using a specific API, or you can use the s3:ObjectCreated:* event type to
+     * request notification regardless of the API that was used to create an
+     * object.
+     */
+    ObjectCreatedCopy = 's3:ObjectCreated:Copy',
+
+    /**
+     * Amazon S3 APIs such as PUT, POST, and COPY can create an object. Using
+     * these event types, you can enable notification when an object is created
+     * using a specific API, or you can use the s3:ObjectCreated:* event type to
+     * request notification regardless of the API that was used to create an
+     * object.
+     */
+    ObjectCreatedCompleteMultipartUpload = 's3:ObjectCreated:CompleteMultipartUpload',
+
+    /**
+     * By using the ObjectRemoved event types, you can enable notification when
+     * an object or a batch of objects is removed from a bucket.
+     *
+     * You can request notification when an object is deleted or a versioned
+     * object is permanently deleted by using the s3:ObjectRemoved:Delete event
+     * type. Or you can request notification when a delete marker is created for
+     * a versioned object by using s3:ObjectRemoved:DeleteMarkerCreated. For
+     * information about deleting versioned objects, see Deleting Object
+     * Versions. You can also use a wildcard s3:ObjectRemoved:* to request
+     * notification anytime an object is deleted.
+     *
+     * You will not receive event notifications from automatic deletes from
+     * lifecycle policies or from failed operations.
+     */
+    ObjectRemoved = 's3:ObjectRemoved:*',
+
+    /**
+     * By using the ObjectRemoved event types, you can enable notification when
+     * an object or a batch of objects is removed from a bucket.
+     *
+     * You can request notification when an object is deleted or a versioned
+     * object is permanently deleted by using the s3:ObjectRemoved:Delete event
+     * type. Or you can request notification when a delete marker is created for
+     * a versioned object by using s3:ObjectRemoved:DeleteMarkerCreated. For
+     * information about deleting versioned objects, see Deleting Object
+     * Versions. You can also use a wildcard s3:ObjectRemoved:* to request
+     * notification anytime an object is deleted.
+     *
+     * You will not receive event notifications from automatic deletes from
+     * lifecycle policies or from failed operations.
+     */
+    ObjectRemovedDelete = 's3:ObjectRemoved:Delete',
+
+    /**
+     * By using the ObjectRemoved event types, you can enable notification when
+     * an object or a batch of objects is removed from a bucket.
+     *
+     * You can request notification when an object is deleted or a versioned
+     * object is permanently deleted by using the s3:ObjectRemoved:Delete event
+     * type. Or you can request notification when a delete marker is created for
+     * a versioned object by using s3:ObjectRemoved:DeleteMarkerCreated. For
+     * information about deleting versioned objects, see Deleting Object
+     * Versions. You can also use a wildcard s3:ObjectRemoved:* to request
+     * notification anytime an object is deleted.
+     *
+     * You will not receive event notifications from automatic deletes from
+     * lifecycle policies or from failed operations.
+     */
+    ObjectRemovedDeleteMarkerCreated = 's3:ObjectRemoved:DeleteMarkerCreated',
+
+    /**
+     * You can use this event type to request Amazon S3 to send a notification
+     * message when Amazon S3 detects that an object of the RRS storage class is
+     * lost.
+     */
+    ReducedRedundancyLostObject = 's3:ReducedRedundancyLostObject',
+}
+
 class ImportedBucketRef extends BucketRef {
     public readonly bucketArn: BucketArn;
     public readonly bucketName: BucketName;

packages/@aws-cdk/aws-s3/lib/index.ts

@@ -1,6 +1,7 @@
 export * from './bucket';
 export * from './bucket-policy';
 export * from './rule';
+export * from './notification-dest';
 
 // AWS::S3 CloudFormation Resources:
 export * from './s3.generated';

packages/@aws-cdk/aws-s3/lib/notification-dest.ts

@@ -0,0 +1,37 @@
+import cdk = require('@aws-cdk/cdk');
+import { Bucket } from './bucket';
+
+/**
+ * Implemented by constructs that can be used as bucket notification targets.
+ */
+export interface INotificationDestination {
+    /**
+     * Registers this resource to receive notifications for the specified bucket.
+     * @param bucket The bucket. Use the `path` of the bucket as a unique ID.
+     */
+    bucketNotificationDestination(bucket: Bucket): NotificationDestinationProps;
+}
+
+/**
+ * Represents the properties of a notification target.
+ */
+export interface NotificationDestinationProps {
+    /**
+     * The notification type.
+     */
+    readonly type: NotificationDestinationType;
+
+    /**
+     * The ARN of the target.
+     */
+    readonly arn: cdk.Arn;
+}
+
+/**
+ * Supported types of notificaiton targets.
+ */
+export enum NotificationDestinationType {
+    Lambda,
+    Queue,
+    Topic
+}

packages/@aws-cdk/aws-s3/lib/notifications-resource/index.ts

@@ -0,0 +1 @@
+export * from './notifications-resource';