UploadObjectUsingPresignedURLTest.cs

// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-s3-developer-guide/blob/master/LICENSE-SAMPLECODE.)

using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.IO;
using System.Net;

namespace Amazon.DocSamples.S3
{
    class UploadObjectUsingPresignedURLTest
    {
        private const string bucketName = "*** provide bucket name ***";
        private const string objectKey  = "*** provide the name for the uploaded object ***";
        private const string filePath   = "*** provide the full path name of the file to upload ***";
        // Specify your bucket region (an example region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2; 
        private static IAmazonS3 s3Client;

        public static void Main()
        {
            s3Client = new AmazonS3Client(bucketRegion);
            var url = GeneratePreSignedURL();
            UploadObject(url);
        }

        private static void UploadObject(string url)
        {
            HttpWebRequest httpRequest = WebRequest.Create(url) as HttpWebRequest;
            httpRequest.Method = "PUT";
            using (Stream dataStream = httpRequest.GetRequestStream())
            {
                var buffer = new byte[8000];
                using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    int bytesRead = 0;
                    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        dataStream.Write(buffer, 0, bytesRead);
                    }
                }
            }
            HttpWebResponse response = httpRequest.GetResponse() as HttpWebResponse;
        }

        private static string GeneratePreSignedURL()
        {
            var request = new GetPreSignedUrlRequest
            {
                BucketName = bucketName,
                Key        = objectKey,
                Verb       = HttpVerb.PUT,
                Expires    = DateTime.Now.AddMinutes(5)
            };

           string url = s3Client.GetPreSignedURL(request);
           return url;
        }
    }
}