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Amazon S3 - Event Notifications

S3 can send notifications when specific events occur on objects.

Common events:

s3:ObjectCreated (upload or copy)

s3:ObjectRemoved (delete)

s3:ObjectRestore (Glacier restore)

s3:Replication status changes

Key features:

Object name filtering by prefix/suffix (e.g., .jpg).

Multiple event notifications per bucket.

Typical delivery in seconds, but may take longer.

Use cases: trigger Lambda to process uploads, send messages to SQS/SNS.

Destinations:

SNS topic

SQS queue

Lambda function

Permissions:

Target services must have a resource-based policy allowing s3.amazonaws.com to publish/send/invoke, restricted by aws:SourceArn of the bucket.

Amazon S3 – Event Notifications via EventBridge

Instead of the basic notification system, S3 can send all events to Amazon EventBridge.

Advantages:

Advanced JSON-based filtering (by metadata, size, object name, etc.).

Route events to 18+ AWS services, including Step Functions, Kinesis, Lambda, SNS, SQS.

Supports event archiving, replay, and reliable delivery.