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EnforceMD5Content.go
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/
EnforceMD5Content.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// snippet-start:[s3.go.enforce_md5]
package main
// snippet-start:[s3.go.enforce_md5.imports]
import (
"crypto/md5"
"encoding/base64"
"flag"
"fmt"
"net/http"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
// snippet-end:[s3.go.enforce_md5.imports]
// SetMd5 enforces an MD5 checksum on the object uploaded to a bucket
// Inputs:
//
// sess is the current session, which provides configuration for the SDK's service clients
// bucket is the name of the bucket
// key is the key of the object
//
// Output:
//
// If success, an HTTP response object and nil
// Otherwise, nil and an error from the call to PutObjectRequest
func SetMd5(sess *session.Session, bucket, key *string) (*http.Response, error) {
// snippet-start:[s3.go.enforce_md5.client_md5]
svc := s3.New(sess)
h := md5.New()
content := strings.NewReader("")
_, err := content.WriteTo(h)
// snippet-end:[s3.go.enforce_md5.client_md5]
if err != nil {
return nil, err
}
// snippet-start:[s3.go.enforce_md5.put_object]
resp, _ := svc.PutObjectRequest(&s3.PutObjectInput{
Bucket: bucket,
Key: key,
})
md5s := base64.StdEncoding.EncodeToString(h.Sum(nil))
resp.HTTPRequest.Header.Set("Content-MD5", md5s)
url, err := resp.Presign(15 * time.Minute)
// snippet-end:[s3.go.enforce_md5.put_object]
if err != nil {
return nil, err
}
// snippet-start:[s3.go.enforce_md5.new_request]
req, err := http.NewRequest("PUT", url, strings.NewReader(""))
req.Header.Set("Content-MD5", md5s)
// snippet-end:[s3.go.enforce_md5.new_request]
if err != nil {
return nil, err
}
// snippet-start:[s3.go.enforce_md5.default_client]
defClient, err := http.DefaultClient.Do(req)
// snippet-end:[s3.go.enforce_md5.default_client]
if err != nil {
return nil, err
}
return defClient, nil
}
func main() {
// snippet-start:[s3.go.enforce_md5.args]
bucket := flag.String("b", "", "The name of the bucket")
key := flag.String("k", "", "The object key")
flag.Parse()
if *bucket == "" || *key == "" {
fmt.Println("You must supply a bucket name (-b BUCKET) and key name (-k KEY)")
return
}
// snippet-end:[s3.go.enforce_md5.args]
// snippet-start:[s3.go.enforce_md5.session]
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
// snippet-end:[s3.go.enforce_md5.session]
defClient, err := SetMd5(sess, bucket, key)
if err != nil {
fmt.Println("Got an error setting MD5:")
fmt.Println(err)
return
}
fmt.Println(defClient, err)
}
// snippet-end:[s3.go.enforce_md5]