示例#1
0
        /// <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);
                }
            }
        }