改进：增加对Upload part - copy API的支持

API文档：https://cloud.tencent.com/document/product/436/8287

example/object/copyPart.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"net/url"
+
+	"net/http"
+
+	"github.com/tencentyun/cos-go-sdk-v5"
+	"github.com/tencentyun/cos-go-sdk-v5/debug"
+)
+
+func initUpload(c *cos.Client, name string) *cos.InitiateMultipartUploadResult {
+	v, _, err := c.Object.InitiateMultipartUpload(context.Background(), name, nil)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("%#v\n", v)
+	return v
+}
+
+func main() {
+	u, _ := url.Parse("https://test-1253846586.cos.ap-guangzhou.myqcloud.com")
+	b := &cos.BaseURL{BucketURL: u}
+	c := cos.NewClient(b, &http.Client{
+		Transport: &cos.AuthorizationTransport{
+			SecretID:  os.Getenv("COS_SECRETID"),
+			SecretKey: os.Getenv("COS_SECRETKEY"),
+			Transport: &debug.DebugRequestTransport{
+				RequestHeader:  true,
+				RequestBody:    true,
+				ResponseHeader: true,
+				ResponseBody:   true,
+			},
+		},
+	})
+
+	sourceUrl := "test-1253846586.cos.ap-guangzhou.myqcloud.com/source/copy_multi_upload.go"
+	name := "test/test_multi_upload.go"
+	up := initUpload(c, name)
+	uploadID := up.UploadID
+
+	opt := &cos.ObjectCopyPartOptions{}
+	res, _, err := c.Object.CopyPart(
+		context.Background(), name, uploadID, 1, sourceUrl, opt)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("ETag:", res.ETag)
+
+	completeOpt := &cos.CompleteMultipartUploadOptions{}
+	completeOpt.Parts = append(completeOpt.Parts, cos.Object{
+		PartNumber: 1,
+		ETag:       res.ETag,
+	})
+	v, resp, err := c.Object.CompleteMultipartUpload(
+		context.Background(), name, uploadID, completeOpt,
+	)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("%s\n", resp.Status)
+	fmt.Printf("%#v\n", v)
+	fmt.Printf("%s\n", v.Location)
+}

object_part.go

@@ -193,3 +193,52 @@ func (s *ObjectService) AbortMultipartUpload(ctx context.Context, name, uploadID
 	resp, err := s.client.send(ctx, &sendOpt)
 	return resp, err
 }
+
+// ObjectCopyPartOptions is the options of copy-part
+type ObjectCopyPartOptions struct {
+	XCosCopySource                  string `header:"x-cos-copy-source" url:"-"`
+	XCosCopySourceRange             string `header:"x-cos-copy-source-range,omitempty" url:"-"`
+	XCosCopySourceIfModifiedSince   string `header:"x-cos-copy-source-If-Modified-Since,omitempty" url:"-"`
+	XCosCopySourceIfUnmodifiedSince string `header:"x-cos-copy-source-If-Unmodified-Since,omitempty" url:"-"`
+	XCosCopySourceIfMatch           string `header:"x-cos-copy-source-If-Match,omitempty" url:"-"`
+	XCosCopySourceIfNoneMatch       string `header:"x-cos-copy-source-If-None-Match,omitempty" url:"-"`
+}
+
+// CopyPartResult is the result CopyPart
+type CopyPartResult struct {
+	XMLName      xml.Name `xml:"CopyPartResult"`
+	ETag         string
+	LastModified string
+}
+
+// CopyPart 请求实现在初始化以后的分块上传，支持的块的数量为1到10000，块的大小为1 MB 到5 GB。
+// 在每次请求Upload Part时候，需要携带partNumber和uploadID，partNumber为块的编号，支持乱序上传。
+// ObjectCopyPartOptions的XCosCopySource为必填参数，格式为<bucket-name>-<app-id>.cos.<region-id>.myqcloud.com/<object-key>
+// ObjectCopyPartOptions的XCosCopySourceRange指定源的Range，格式为bytes=<start>-<end>
+//
+// 当传入uploadID和partNumber都相同的时候，后传入的块将覆盖之前传入的块。当uploadID不存在时会返回404错误，NoSuchUpload.
+//
+// https://www.qcloud.com/document/product/436/7750
+func (s *ObjectService) CopyPart(ctx context.Context, name, uploadID string, partNumber int, sourceURL string, opt *ObjectCopyPartOptions) (*CopyPartResult, *Response, error) {
+	if opt == nil {
+		opt = &ObjectCopyPartOptions{}
+	}
+	opt.XCosCopySource = sourceURL
+	u := fmt.Sprintf("/%s?partNumber=%d&uploadId=%s", encodeURIComponent(name), partNumber, uploadID)
+	var res CopyPartResult
+	sendOpt := sendOptions{
+		baseURL:   s.client.BaseURL.BucketURL,
+		uri:       u,
+		method:    http.MethodPut,
+		optHeader: opt,
+		result:    &res,
+	}
+	resp, err := s.client.send(ctx, &sendOpt)
+	// If the error occurs during the copy operation, the error response is embedded in the 200 OK response. This means that a 200 OK response can contain either a success or an error.
+	if err == nil && resp != nil && resp.StatusCode == 200 {
+		if res.ETag == "" {
+			return &res, resp, errors.New("response 200 OK, but body contains an error")
+		}
+	}
+	return &res, resp, err
+}

object_part_test.go

@@ -271,3 +271,44 @@ func TestObjectService_CompleteMultipartUpload(t *testing.T) {
 		t.Errorf("Object.CompleteMultipartUpload returned \n%#v, want \n%#v", ref, want)
 	}
 }
+
+func TestObjectService_CopyPart(t *testing.T) {
+	setup()
+	defer teardown()
+
+	sourceUrl := "test-1253846586.cos.ap-guangzhou.myqcloud.com/test.source"
+	opt := &ObjectCopyPartOptions{}
+	name := "test/hello.txt"
+	uploadID := "xxxxx"
+	partNumber := 1
+
+	mux.HandleFunc("/test/hello.txt", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, http.MethodPut)
+		vs := values{
+			"uploadId":   uploadID,
+			"partNumber": "1",
+		}
+		testFormValues(t, r, vs)
+
+		fmt.Fprint(w, `<CopyPartResult>
+   <ETag>&quot;ba82b57cfdfda8bd17ad4e5879ebb4fe&quot;</ETag>
+   <LastModified>2017-09-04T04:45:45</LastModified>
+</CopyPartResult>`)
+	})
+
+	r, _, err := client.Object.CopyPart(context.Background(),
+		name, uploadID, partNumber, sourceUrl, opt)
+	if err != nil {
+		t.Fatalf("Object.CopyPart returned error: %v", err)
+	}
+
+	want := &CopyPartResult{
+		XMLName:      xml.Name{Local: "CopyPartResult"},
+		ETag:         `"ba82b57cfdfda8bd17ad4e5879ebb4fe"`,
+		LastModified: "2017-09-04T04:45:45",
+	}
+
+	if !reflect.DeepEqual(r, want) {
+		t.Errorf("Object.Copy returned %+v, want %+v", r, want)
+	}
+}