Golang : Upload to S3 with official aws-sdk-go package

An update to my previous tutorial on how to upload data to AWS S3, this tutorial uses the "official" AWS-SDK-GO package. As usual, please take note the the AWS-SDK-GO is still underdevelopment and the code example below might become obsolete. At the time of writing, it is working perfectly.

Here you go!

 package main

 import (
 "bytes"
 "fmt"
 "github.com/aws/aws-sdk-go/aws"
 "github.com/aws/aws-sdk-go/aws/awserr"
 "github.com/aws/aws-sdk-go/aws/awsutil"
 "github.com/aws/aws-sdk-go/aws/credentials"
 "github.com/aws/aws-sdk-go/service/s3"
 "net/http"
 "os"
 )

 func main() {

 // DO NOT PUT credentials in code for production usage!
 // see https://www.socketloop.com/tutorials/golang-setting-up-configure-aws-credentials-with-official-aws-sdk-go
 // on setting creds from environment or loading from file

 // the file location and load default profile
 creds := credentials.NewSharedCredentials("/<change this>/.aws/credentials", "default")

 _, err := creds.Get()

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 aws.DefaultConfig.Region = "us-east-1" //<--- change this to yours

 config := &aws.Config{
 Region: "",
 Endpoint: "s3.amazonaws.com", // <-- forking important !
 S3ForcePathStyle: true, // <-- without these lines. All will fail! fork you aws!
 Credentials: creds,
 LogLevel: 0, // <-- feel free to crank it up 
 }

 s3client := s3.New(config)

 bucketName := "<change>" // <-- change this to your bucket name

 fileToUpload := "<change>"

 file, err := os.Open(fileToUpload)

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 defer file.Close()

 fileInfo, _ := file.Stat()
 var size int64 = fileInfo.Size()

 buffer := make([]byte, size)

 // read file content to buffer
 file.Read(buffer)

 fileBytes := bytes.NewReader(buffer) // convert to io.ReadSeeker type

 fileType := http.DetectContentType(buffer)

 path := "/examplefolder/" + file.Name() // target file and location in S3

 params := &s3.PutObjectInput{
 Bucket: aws.String(bucketName), // required
 Key: aws.String(path), // required
 ACL: aws.String("public-read"),
 Body: fileBytes,
 ContentLength: aws.Long(size),
 ContentType: aws.String(fileType),
 Metadata: map[string]*string{
 "Key": aws.String("MetadataValue"), //required
 },
 // see more at http://godoc.org/github.com/aws/aws-sdk-go/service/s3#S3.PutObject
 }

 result, err := s3client.PutObject(params)

 if err != nil {
 if awsErr, ok := err.(awserr.Error); ok {
 // Generic AWS Error with Code, Message, and original error (if any)
 fmt.Println(awsErr.Code(), awsErr.Message(), awsErr.OrigErr())
 if reqErr, ok := err.(awserr.RequestFailure); ok {
 // A service error occurred
 fmt.Println(reqErr.Code(), reqErr.Message(), reqErr.StatusCode(), reqErr.RequestID())
 }
 } else {
 // This case should never be hit, the SDK should always return an
 // error which satisfies the awserr.Error interface.
 fmt.Println(err.Error())
 }
 }

 fmt.Println(awsutil.StringValue(result))
 }

Sample output :

...

Content-Type: application/zip

X-Amz-Acl: public-read

X-Amz-Content-Sha256: b39a762d032dd518aacf51cbee2a70a3bc90e24ceddc6cd3c94d29b0882beaa0

X-Amz-Date: 20150610T084114Z

X-Amz-Meta-Key: MetadataValue

Accept-Encoding: gzip

---

---[ RESPONSE ]--------------------------------------

HTTP/1.1 200 OK

---

{

ETag: "\"04f9ed14026972f61407e98b0cbe6445\""

}

References :

https://www.socketloop.com/tutorials/golang-upload-and-download-file-to-from-aws-s3

http://godoc.org/github.com/aws/aws-sdk-go/service/s3#S3.PutObject