add an example

unmaintained/s3/presigned_put/presigned_put.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"encoding/base64"
+	"fmt"
+	"crypto/md5"
+	"strings"
+	"time"
+	"net/http"
+)
+
+// 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
+	}
+	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.
+`