It's not clear what the type of "out" is, other than it has Stat() and
Read([]byte) methods, but, assuming it's an io.Reader at least, if you
examine the return values from Read, like:
n, err := out.Read(buffer)
you may get a clue to what's going wrong, for example n might not be the
full size of the file, there might be an error, etc. Likewise it's worth
checking the error returned from Stat.
It might be that "out" already is a ReadSeekCloser (if it's an *io.File for
example) in which case you can set Body in the UploadInput just to "out":
...
Body: out,
...
and dispense with all the stuff related to buffer.
On Tuesday, August 14, 2018 at 6:18:43 AM UTC+1, Sachin Makaram wrote:
>
> Hi,
>
> I am trying to upload a local image file to an AWS S3 bucket and return
> the public URL in Golang. This is the core Golang code I have written to
> interact with my S3 bucket:
>
> creds :=
> credentials.NewSharedCredentials("/Users/username/.aws/credentials",
> "default")
>
> config := &aws.Config{
> Region: aws.String("us-west-2"),
> Credentials: creds,
> }
>
> sess := session.New(config)
>
> uploader := s3manager.NewUploader(sess, func(u *s3manager.Uploader) {
> u.PartSize = 64 * 1024 * 1024
> u.LeavePartsOnError = true
> })
>
> fmt.Println(header.Filename)
>
> fileInfo, _ := out.Stat()
> var size int64 = fileInfo.Size()
> fmt.Println("size", size)
> buffer := make([]byte, size)
>
> out.Read(buffer)
> fileBytes := bytes.NewReader(buffer)
>
> result, err := uploader.Upload(&s3manager.UploadInput{
> Bucket: aws.String("bucket-name"),
> Key: aws.String(header.Filename),
> Body: aws.ReadSeekCloser(fileBytes),
> ContentType: aws.String("image/jpeg"),
> ACL: aws.String("public-read"),
> })
> if err != nil || result == nil {
> log.Fatalln("Failed to upload", err)
> }
>
> log.Println("Successfully uploaded to", result.Location)
>
> With this code, the file is uploaded successfully to my s3 bucket with the
> correct size in bytes, but when I click on the URL, a black square is
> displayed instead of the actual image. If I change the ContentType field to
> allow file types dynamically, when I click on the URL, it downloads the
> image, but the image cannot be opened because "it may have been damaged."
> How can I fix this Golang code to just upload an image to an S3 bucket and
> get the public URL as a result of that upload?
>
> This may be more of a debugging question pertaining to AWS S3 than Golang,
> but any help would be appreciated. Thank you!
>
>
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