Get an S3 Presigned Url with AWS CLI

How to get an S3 Presigned Url with AWS CLI #

To get an S3 presigned URL using the AWS CLI, invoke the aws s3 presign s3://my-bucket/file.txt command, where you specify the entire path of the object in the S3 URI.

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aws s3 presign s3://YOUR_BUCKET/your-file.txt

By default the presigned url is valid for 3600 seconds, which is 60 minutes.

If you click on the URL, you will see the contents of the file in your browser.

To configure when the presigned url should expire, use the --expires-in parameter. It allows us to specify the number of seconds the presigned url should be valid for.

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aws s3 presign s3://YOUR_BUCKET/your-file.txt --expires-in 10

In the example above, the presigned URL will only be valid for 10 seconds. If the url is accessed after 10 seconds, it returns an AccessDenied error.

Note that the s3 presign command only generates GET presigned urls, if you want to upload files to an S3 bucket using POST or PUT presigned urls, you have to use the AWS SDK.

To learn more about uploading files to an S3 bucket, using presigned urls, check out my other articles:

• How to upload Files to S3 in React using presigned urls
• Tips and Tricks for using S3 presigned POST urls on AWS

Further Reading #

• AWS CDK Tutorial for Beginners - Step-by-Step Guide
• How does AWS CDK work
• What is a Token in AWS CDK
• CDK Constructs - Complete Guide
• What is an identifier (id) in AWS CDK
• How to use Context in AWS CDK
• How to use Parameters in AWS CDK