Use GetBucketLocation with an AWS SDK or CLI

The following command retrieves the location constraint for a bucket named my-bucket, if a constraint exists:

aws s3api get-bucket-location --bucket my-bucket

Output:

{
    "LocationConstraint": "us-west-2"
}

Example 1: This command returns the location constraint for the bucket 's3testbucket', if a constraint exists.

Get-S3BucketLocation -BucketName 'amzn-s3-demo-bucket'

Output:

Value
-----
ap-south-1

async fn show_buckets(
    strict: bool,
    client: &Client,
    region: BucketLocationConstraint,
) -> Result<(), S3ExampleError> {
    let mut buckets = client.list_buckets().into_paginator().send();

    let mut num_buckets = 0;
    let mut in_region = 0;

    while let Some(Ok(output)) = buckets.next().await {
        for bucket in output.buckets() {
            num_buckets += 1;
            if strict {
                let r = client
                    .get_bucket_location()
                    .bucket(bucket.name().unwrap_or_default())
                    .send()
                    .await?;

                if r.location_constraint() == Some(&region) {
                    println!("{}", bucket.name().unwrap_or_default());
                    in_region += 1;
                }
            } else {
                println!("{}", bucket.name().unwrap_or_default());
            }
        }
    }

    println!();
    if strict {
        println!(
            "Found {} buckets in the {} region out of a total of {} buckets.",
            in_region, region, num_buckets
        );
    } else {
        println!("Found {} buckets in all regions.", num_buckets);
    }

    Ok(())
}