masterxavierfox · May 29, 2019 07:42 · May 29, 2019 · May 29, 2019
diff --git a/s3master.go b/s3master.go
@@ -1,4 +1,5 @@
- package main
+//https://socketloop.com/tutorials/golang-upload-and-download-file-to-from-aws-s3 
+package main
 
  import (
          "bufio"

diff --git a/s3master.go b/s3master.go
@@ -0,0 +1,103 @@
+ package main
+
+ import (
+         "bufio"
+         "fmt"
+         "io"
+         "launchpad.net/goamz/aws"
+         "launchpad.net/goamz/s3"
+         "net/http"
+         "os"
+ )
+
+ func main() {
+         AWSAuth := aws.Auth{
+                 AccessKey: "", // change this to yours
+                 SecretKey: "",
+         }
+
+         region := aws.USEast
+         // change this to your AWS region
+         // click on the bucketname in AWS control panel and click Properties
+         // the region for your bucket should be under "Static Website Hosting" tab
+
+         connection := s3.New(AWSAuth, region)
+
+         bucket := connection.Bucket("<your bucketname>") // change this your bucket name
+
+         path := "example/big.jpg" // this is the target file and location in S3
+
+         // need to read big.jpg into a []byte buffer
+         // see https://www.socketloop.com/tutorials/golang-read-binary-file-into-memory
+
+         fileToBeUploaded := "big.jpg"
+
+         file, err := os.Open(fileToBeUploaded)
+
+         if err != nil {
+                 fmt.Println(err)
+                 os.Exit(1)
+         }
+
+         defer file.Close()
+
+         fileInfo, _ := file.Stat()
+         var size int64 = fileInfo.Size()
+         bytes := make([]byte, size)
+
+         // read into buffer
+         buffer := bufio.NewReader(file)
+         _, err = buffer.Read(bytes)
+
+         // then we need to determine the file type
+         // see https://www.socketloop.com/tutorials/golang-how-to-verify-uploaded-file-is-image-or-allowed-file-types
+
+         filetype := http.DetectContentType(bytes)
+
+         err = bucket.Put(path, bytes, filetype, s3.ACL("public-read"))
+
+         if err != nil {
+                 fmt.Println(err)
+                 os.Exit(1)
+
+              // NOTE : If you get this error message
+              // Get : 301 response missing Location header
+
+              // this is because you are using the wrong region for the bucket
+              // and if you want to figure out the bucket location automatically
+              // see http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGETlocation.html
+              // I've try it out with http.Get() and just getting the authenticating 
+              // requests part right is already too much
+              // work for this tutorial.
+              // See http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html
+
+              // UPDATE 15th Jan 2015: See http://camlistore.org/pkg/misc/amazon/s3/#Client.BucketLocation
+         }
+
+         fmt.Printf("Uploaded to %s with %v bytes to S3.\n\n", path, size)
+
+         // Download(GET)
+         downloadBytes, err := bucket.Get(path)
+
+         if err != nil {
+                 fmt.Println(err)
+                 os.Exit(1)
+         }
+
+         downloadFile, err := os.Create("download.jpg")
+
+         if err != nil {
+                 fmt.Println(err)
+                 os.Exit(1)
+         }
+
+         defer downloadFile.Close()
+
+         downloadBuffer := bufio.NewWriter(downloadFile)
+         downloadBuffer.Write(downloadBytes)
+
+         io.Copy(downloadBuffer, downloadFile)
+
+         fmt.Printf("Downloaded from S3 and saved to download.jpg. \n\n")
+
+ }