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AWS S3 Event Notification

In this article, we will send an email when a file is uploaded to the S3 bucket.

Steps

For the implementation, we will work on the following steps: -

Create an SNS topic and subscription
Create an S3 bucket
Update the S3 access policy of the SNS topic
Create an event notification in the S3 bucket
Upload the file
Email notification

Let us get started.

Create An SNS Topic And Subscription

First, create an SNS topic and subscription.

Picture showing the new topic created in SNS

Picture showing the subscription created in SNS

Create An S3 Bucket

The next step is to create a public S3 bucket.

Picture showing the new S3 bucket created in AWS

Update The S3 Access Policy Of The SNS Topic

To update the S3 access policy, go to the Access policy tab of the topic.

Picture showing the Access policy tab in S3 bucket

Click on the Edit button. In the edit screen, update the access policy by specifying the ARN of the S3 bucket.

Picture showing specifying the S3 ARN in bucket access policy

{
  "Version": "2008-10-17",
  "Id": "__default_policy_ID",
  "Statement": [
    {
      "Sid": "__default_statement_ID",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": [
        "SNS:GetTopicAttributes",
        "SNS:SetTopicAttributes",
        "SNS:AddPermission",
        "SNS:RemovePermission",
        "SNS:DeleteTopic",
        "SNS:Subscribe",
        "SNS:ListSubscriptionsByTopic",
        "SNS:Publish"
      ],
      "Resource": "arn:aws:sns:ap-south-1:462618770999:mytopic",
      "Condition": {
        "ArnLike": {
          "aws:SourceArn": "arn:aws:s3:::gyansangrah-bucket"
        }
      }
    }
  ]
}

Create An Event Notification In The S3 Bucket

To create an event notification, go to the Properties tab of the bucket.

Picture showing the Properties tab of the RDS

Scroll down to the event notification section and click on the Create event notification button.

Picture showing the Create event notification button for creating the new event notification

Specify the Event name, Event types, and Destination. Here, the destination would be the SNS topic.

Picture showing the screen to specify the event name, event type and destination in the create event notification screen

Click on the Save changes button to save the event notification.

Upload The File

Upload an image file on the S3 bucket.

Picture showing the image upload on the S3 bucket

Email Notification

You can get an email notification.

Posted By -	Karan Gupta

Posted On -	Tuesday, January 4, 2022

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