Question

I need to retrieve images from S3. I can’t make the folder public and I cant use presigned URL’s so all I am left with is GetObject();. Now the image that I’ll get back has to be set as a source for an Iframe. To do that I am using a HttpWebHandler. The issue is that if i retrieve a html page it is working fine. But when I try to get an image back, all i get is junk data. Here is my code:

 public void ProcessRequest(HttpContext context)
        {

            NameValueCollection appConfig = ConfigurationManager.AppSettings;
            _accessKeyId = appConfig["AWSAccessKey"];
            _secretAccessKeyId = appConfig["AWSSecretKey"];
            S3 = new AmazonS3Client(_accessKeyId, _secretAccessKeyId);
            string responseBody = "";
            var request = new GetObjectRequest()
            .WithBucketName(bucketName).WithKey("020/images/intro.jpg");
            var responseHeaders = new ResponseHeaderOverrides
                                      {
                                          ContentType = "image/jpeg"
                                      };

            request.ResponseHeaderOverrides = responseHeaders;
            using (var response = S3.GetObject(request))
            {
                using (var responseStream = response.ResponseStream)
                {
                    using (var reader =
                        new StreamReader(responseStream))
                    {
                        responseBody = reader.ReadToEnd();
                    }
                }

            }
            context.Response.Write(responseBody);
            context.Response.Flush();
            context.Response.End();
        }
}

Answer 1

There are a couple of problems here:

1. You are setting the Content-Type on the response coming back from amazon, but not on the response from your application
2. You are using a StreamReader to read the content of the stream as text and then writing it back as text

Try this instead:

using (var response = S3.GetObject(request))
{
    using (var responseStream = response.ResponseStream)
    {
        context.Response.ContentType = "image/jpeg";

        var buffer = new byte[8000];
        int bytesRead = -1;
        while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) > 0)
        {
            context.Response.OutputStream.Write(buffer, 0, bytesRead);
        }
    }
}

context.Response.End();