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
See also : Golang : Create S3 bucket with official aws-sdk-go package
By Adam Ng
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