CODEWITHSUNDEEP
amazon-web-servicesgoamazon-s3
Madhuka Harith
Madhuka Harith

Reputation: 1434

How to download from public s3 bucket using golang

I'm implementing a function to download a file from an s3 bucket. This worked fine when the bucket was private and I set the credentials

os.Setenv("AWS_ACCESS_KEY_ID", "test")
os.Setenv("AWS_SECRET_ACCESS_KEY", "test")

However, I made the s3 bucket public as described in here and now I want to download it without credentials.

func DownloadFromS3Bucket(bucket, item, path string) {
    file, err := os.Create(filepath.Join(path, item))
    if err != nil {
        fmt.Printf("Error in downloading from file: %v \n", err)
        os.Exit(1)
    }

    defer file.Close()

    sess, _ := session.NewSession(&aws.Config{
        Region: aws.String(constants.AWS_REGION)},
    )

    // Create a downloader with the session and custom options
    downloader := s3manager.NewDownloader(sess, func(d *s3manager.Downloader) {
        d.PartSize = 64 * 1024 * 1024 // 64MB per part
        d.Concurrency = 6
    })

    numBytes, err := downloader.Download(file,
        &s3.GetObjectInput{
            Bucket: aws.String(bucket),
            Key:    aws.String(item),
        })
    if err != nil {
        fmt.Printf("Error in downloading from file: %v \n", err)
        os.Exit(1)
    }

    fmt.Println("Download completed", file.Name(), numBytes, "bytes")
}

But now I'm getting an error.

Error in downloading from file: NoCredentialProviders: no valid providers in chain. Deprecated.
    For verbose messaging see aws.Config.CredentialsChainVerboseErrors

Any idea how to download it without credentials?

Upvotes: 1

Views: 3004

Answers (1)

Madhuka Harith
Madhuka Harith

Reputation: 1434

We can set Credentials: credentials.AnonymousCredentials when creating session. Following is the working code.

func DownloadFromS3Bucket(bucket, item, path string) {
    file, err := os.Create(filepath.Join(path, item))
    if err != nil {
        fmt.Printf("Error in downloading from file: %v \n", err)
        os.Exit(1)
    }

    defer file.Close()

    sess, _ := session.NewSession(&aws.Config{
        Region: aws.String(constants.AWS_REGION), Credentials: credentials.AnonymousCredentials},
    )

    // Create a downloader with the session and custom options
    downloader := s3manager.NewDownloader(sess, func(d *s3manager.Downloader) {
        d.PartSize = 64 * 1024 * 1024 // 64MB per part
        d.Concurrency = 6
    })

    numBytes, err := downloader.Download(file,
        &s3.GetObjectInput{
            Bucket: aws.String(bucket),
            Key:    aws.String(item),
        })
    if err != nil {
        fmt.Printf("Error in downloading from file: %v \n", err)
        os.Exit(1)
    }

    fmt.Println("Download completed", file.Name(), numBytes, "bytes")
}

Upvotes: 1

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