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vendor/github.com/aws/aws-sdk-go/example/service/s3/concatObjects/README.md

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+# Example
+
+This is an example using the AWS SDK for Go to concatenate two objects together.
+We use `UploadPartCopy` which uses an object for a part. Here in this example we have two parts, or in other words
+two objects that we want to concatenate together.
+
+
+# Usage
+
+The example uses the bucket name provided, two keys for each object, and lastly the output key.
+
+```sh
+AWS_REGION=<region> go run -tags example concatenateObjects.go <bucket> <key for object 1> <key for object 2> <key for output>
+```

vendor/github.com/aws/aws-sdk-go/example/service/s3/concatObjects/concatObjects.go

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+// +build example
+
+package main
+
+import (
+	"log"
+	"net/url"
+	"os"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+)
+
+type client struct {
+	s3Client *s3.S3
+	bucket   *string
+}
+
+// concatenate will contenate key1's object to key2's object under the key testKey
+func (c *client) concatenate(key1, key2, key3 string, uploadID *string) (*string, *string, error) {
+	// The first part to be uploaded which is represented as part number 1
+	foo, err := c.s3Client.UploadPartCopy(&s3.UploadPartCopyInput{
+		Bucket:     c.bucket,
+		CopySource: aws.String(url.QueryEscape(*c.bucket + "/" + key1)),
+		PartNumber: aws.Int64(1),
+		Key:        &key3,
+		UploadId:   uploadID,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// The second part that is going to be appended to the newly created testKey
+	// object.
+	bar, err := c.s3Client.UploadPartCopy(&s3.UploadPartCopyInput{
+		Bucket:     c.bucket,
+		CopySource: aws.String(url.QueryEscape(*c.bucket + "/" + key2)),
+		PartNumber: aws.Int64(2),
+		Key:        &key3,
+		UploadId:   uploadID,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+	// The ETags are needed to complete the process
+	return foo.CopyPartResult.ETag, bar.CopyPartResult.ETag, nil
+}
+
+func main() {
+	if len(os.Args) < 4 {
+		log.Println("USAGE ERROR: AWS_REGION=us-east-1 go run concatenateObjects.go <bucket> <key for object 1> <key for object 2> <key for output>")
+		return
+	}
+
+	bucket := os.Args[1]
+	key1 := os.Args[2]
+	key2 := os.Args[3]
+	key3 := os.Args[4]
+	sess := session.New(&aws.Config{})
+	svc := s3.New(sess)
+
+	c := client{svc, &bucket}
+
+	// We let the service know that we want to do a multipart upload
+	output, err := c.s3Client.CreateMultipartUpload(&s3.CreateMultipartUploadInput{
+		Bucket: &bucket,
+		Key:    &key3,
+	})
+
+	if err != nil {
+		log.Println("ERROR:", err)
+		return
+	}
+
+	foo, bar, err := c.concatenate(key1, key2, key3, output.UploadId)
+	if err != nil {
+		log.Println("ERROR:", err)
+		return
+	}
+
+	// We finally complete the multipart upload.
+	_, err = c.s3Client.CompleteMultipartUpload(&s3.CompleteMultipartUploadInput{
+		Bucket:   &bucket,
+		Key:      &key3,
+		UploadId: output.UploadId,
+		MultipartUpload: &s3.CompletedMultipartUpload{
+			Parts: []*s3.CompletedPart{
+				{
+					ETag:       foo,
+					PartNumber: aws.Int64(1),
+				},
+				{
+					ETag:       bar,
+					PartNumber: aws.Int64(2),
+				},
+			},
+		},
+	})
+	if err != nil {
+		log.Println("ERROR:", err)
+		return
+	}
+}