/// <summary>
/// Determines whether an S3 bucket exists or not.
/// This is done by:
/// 1. Creating a PreSigned Url for the bucket (with an expiry date at the end of this decade)
/// 2. Making a HEAD request to the Url
/// </summary>
/// <param name="bucketName">The name of the bucket to check.</param>
/// <param name="s3Client">The Amazon S3 Client to use for S3 specific operations.</param>
/// <returns></returns>
public static bool DoesS3BucketExist(IAmazonS3 s3Client, string bucketName)
{
if (s3Client == null)
{
throw new ArgumentNullException("s3Client", "The s3Client cannot be null!");
}
if (String.IsNullOrEmpty(bucketName))
{
throw new ArgumentNullException("bucketName", "The bucketName cannot be null or the empty string!");
}
GetPreSignedUrlRequest request = new GetPreSignedUrlRequest();
request.BucketName = bucketName;
request.Expires = new DateTime(2019, 12, 31);
request.Verb = HttpVerb.HEAD;
request.Protocol = Protocol.HTTP;
string url = s3Client.GetPreSignedURL(request);
Uri uri = new Uri(url);
HttpWebRequest httpRequest = WebRequest.Create(uri) as HttpWebRequest;
httpRequest.Method = "HEAD";
AmazonS3Client concreteClient = s3Client as AmazonS3Client;
if (concreteClient != null)
{
concreteClient.ConfigureProxy(httpRequest);
}
try
{
using (HttpWebResponse httpResponse = httpRequest.GetResponse() as HttpWebResponse)
{
// If all went well, the bucket was found!
return(true);
}
}
catch (WebException we)
{
using (HttpWebResponse errorResponse = we.Response as HttpWebResponse)
{
if (errorResponse != null)
{
HttpStatusCode code = errorResponse.StatusCode;
return(code != HttpStatusCode.NotFound &&
code != HttpStatusCode.BadRequest);
}
// The Error Response is null which is indicative of either
// a bad request or some other problem
return(false);
}
}
}