fraXis fraXis - 2 months ago 29
C# Question

Determine if an object exists in a S3 bucket based on wildcard

Can someone please show me how to determine if a certain file/object exists in a S3 bucket and display a message if it exists or if it does not exist.

Basically I want it to:

1) Check a bucket on my S3 account such as testbucket

2) Inside of that bucket, look to see if there is a file with the prefix test_ (test_file.txt or test_data.txt).

3) If that file exists, then display a MessageBox (or Console message) that the file exists, or that the file does not exist.

Can someone please show me how to do this?

Answer

Using the AWSSDK For .Net I Currently do something along the lines of:

public bool Exists(string fileKey, string bucketName)
{
        try
        {
            response = _s3Client.GetObjectMetadata(new GetObjectMetadataRequest()
               .WithBucketName(bucketName)
               .WithKey(key));

            return true;
        }

        catch (Amazon.S3.AmazonS3Exception ex)
        {
            if (ex.StatusCode == System.Net.HttpStatusCode.NotFound)
                return false;

            //status wasn't not found, so throw the exception
            throw;
        }
}

It kinda sucks, but it works for now.