How to parse the AWS S3 Path (s3://<bucket name>/<key>) using the AWSSDK.S3 in C# in order to get the bucket name & key

Question

I have a s3 path => s3://[bucket name]/[key]

s3://bn-complete-dev-test/1234567890/renders/Irradiance_A.png 

and I need get the bucket_name and the key separately:

var s3PathParsed = parseS3Path("s3://bn-complete-dev-test/1234567890/renders/Irradiance_A.png");

s3PathParsed.BucketName == "bn-complete-dev-test"
s3PathParsed.Key == "1234567890/renders/Irradiance_A.png"

how to I could parse in the correct way using the AWS SDK?

1) I am parsing manually (using a regular expression) and work fine but i am not comfortable:

public class S3Path : IS3Path
{
    private const string _s3PathRegex = @"[s|S]3:\/\/(?<bucket>[^\/]*)\/(?<key>.*)";

    public S3Path(string s3Path)
    {
        Path = s3Path;

        var rx = new Regex(_s3PathRegex).Match(s3Path);

        if (!rx.Success || rx.Groups.Count != 3)
            throw new Exception($"the S3 Path '{s3Path}' is wrong.");

        BucketName = rx.Groups[1].Value;
        Key = rx.Groups[2].Value;
    }

    public string Path { get; }

    public string BucketName { get; }

    public string Key { get; }
}

2) I used the AmazonS3Uri from AWWSDK.S3:

string GetBucketNameFromS3Uri(string s3Uri)
{
    return new AmazonS3Uri(s3Uri).Bucket;            
}

I called the method:

GetBucketNameFromS3Uri("s3://sunsite-complete-dev-test/1234567890/renders/Irradiance_A.png");

and i have the following error:

System.ArgumentException: 'Invalid S3 URI - hostname does not appear to be a valid S3 endpoint'

3) Also I try

string GetBucketNameFromS3Uri(string s3Uri)
{
    return new AmazonS3Uri(new Uri(s3Uri)).Bucket;            
}

with the same error.

I created a new thread in AWS Forum with this issue: https://forums.aws.amazon.com/thread.jspa?threadID=304401

Answer 1

In Java, We can do something like

AmazonS3URI s3URI = new AmazonS3URI("s3://bucket/folder/object.csv");
S3Object s3Object = s3Client.getObject(s3URI.getBucket(), s3URI.getKey());