package main import ( "crypto/md5" "encoding/base64" "fmt" "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/aws/session" "github.com/aws/aws-sdk-go/service/s3" "github.com/seaweedfs/seaweedfs/weed/util" "net/http" "strings" "time" ) // Downloads an item from an S3 Bucket in the region configured in the shared config // or AWS_REGION environment variable. // // Usage: // go run presigned_put.go // For this exampl to work, the domainName is needd // weed s3 -domainName=localhost func main() { h := md5.New() content := strings.NewReader(stringContent) content.WriteTo(h) // Initialize a session in us-west-2 that the SDK will use to load // credentials from the shared credentials file ~/.aws/credentials. sess, err := session.NewSession(&aws.Config{ Region: aws.String("us-east-1"), Endpoint: aws.String("http://localhost:8333"), }) // Create S3 service client svc := s3.New(sess) putRequest, output := svc.PutObjectRequest(&s3.PutObjectInput{ Bucket: aws.String("dev"), Key: aws.String("testKey"), }) fmt.Printf("output: %+v\n", output) md5s := base64.StdEncoding.EncodeToString(h.Sum(nil)) putRequest.HTTPRequest.Header.Set("Content-MD5", md5s) url, err := putRequest.Presign(15 * time.Minute) if err != nil { fmt.Println("error presigning request", err) return } fmt.Println(url) req, err := http.NewRequest("PUT", url, strings.NewReader(stringContent)) req.Header.Set("Content-MD5", md5s) if err != nil { fmt.Println("error creating request", url) return } resp, err := http.DefaultClient.Do(req) if err != nil { fmt.Printf("error put request: %v\n", err) return } defer util.CloseResponse(resp) fmt.Printf("response: %+v\n", resp) } var stringContent = `Generate a Pre-Signed URL for an Amazon S3 PUT Operation with a Specific Payload You can generate a pre-signed URL for a PUT operation that checks whether users upload the correct content. When the SDK pre-signs a request, it computes the checksum of the request body and generates an MD5 checksum that is included in the pre-signed URL. Users must upload the same content that produces the same MD5 checksum generated by the SDK; otherwise, the operation fails. This is not the Content-MD5, but the signature. To enforce Content-MD5, simply add the header to the request. The following example adds a Body field to generate a pre-signed PUT operation that requires a specific payload to be uploaded by users. `