简介

Go SDK 提供获取请求预签名 URL 接口，详细操作请查看本文示例。

获取请求预签名 URL

func (s *ObjectService) GetPresignedURL(ctx context.Context, httpMethod, name, ak, sk string, expired time.Duration, opt interface{}) (*url.URL, error)

参数说明

永久密钥预签名请求示例

上传请求示例

ak := "SECRETID"
sk := "SECRETKEY"
name := "exampleobject"
ctx := context.Background()
f := strings.NewReader("test")
// 1. 通过普通方式上传对象
_, err := client.Object.Put(ctx, name, f, nil)
if err != nil {
   panic(err)
}
// 获取预签名URL
presignedURL, err := client.Object.GetPresignedURL(ctx, http.MethodPut, name, ak, sk, time.Hour, nil)
if err != nil {
   panic(err)
}
// 2. 通过预签名方式上传对象
data := "test upload with presignedURL"
f = strings.NewReader(data)
req, err := http.NewRequest(http.MethodPut, presignedURL.String(), f)
if err != nil {
   panic(err)
}
// 用户可自行设置请求头部
req.Header.Set("Content-Type", "text/html")
_, err = http.DefaultClient.Do(req)
if err != nil {
   panic(err)
}

下载请求示例

ak := "SECRETID"
sk := "SECRETKEY"
name := "exampleobject"
ctx := context.Background()
// 1. 通过普通方式下载对象
resp, err := client.Object.Get(ctx, name, nil)
if err != nil {
   panic(err)
}
bs, _ := ioutil.ReadAll(resp.Body)
resp.Body.Close()
// 获取预签名URL
presignedURL, err := client.Object.GetPresignedURL(ctx, http.MethodGet, name, ak, sk, time.Hour, nil)
if err != nil {
   panic(err)
}
// 2. 通过预签名URL下载对象
resp2, err := http.Get(presignedURL.String())
if err != nil {
   panic(err)
}
bs2, _ := ioutil.ReadAll(resp2.Body)
resp2.Body.Close()
if bytes.Compare(bs2, bs) != 0 {
   panic(errors.New("content is not consistent"))
}

临时密钥预签名请求示例

// 通过tag的方式，用户可以将请求参数或者请求头部放进签名中。
type URLToken struct {
SessionToken string `url:"x-cos-security-token,omitempty" header:"-"`
}
func main() {
// 替换成您的临时密钥
tak := os.Getenv("SECRETID")
tsk := os.Getenv("SECRETKEY")
token := &URLToken{
SessionToken: "<token>",
}
u, _ := url.Parse("https://examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com")
b := &cos.BaseURL{BucketURL: u}
c := cos.NewClient(b, &http.Client{})
name := "exampleobject"
ctx := context.Background()
// 方法1 通过 tag 设置 x-cos-security-token
// Get presigned
presignedURL, err := c.Object.GetPresignedURL(ctx, http.MethodGet, name, tak, tsk, time.Hour, token)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
// Get object by presinged url
resp, err := http.Get(presignedURL.String())
if err != nil {
fmt.Printf("Error: %v\n", err)
}
defer resp.Body.Close()
fmt.Println(presignedURL.String())
fmt.Printf("resp:%v\n", resp)
// 方法2 通过 PresignedURLOptions 设置 x-cos-security-token
  // PresignedURLOptions 提供用户添加请求参数和请求头部
opt := &cos.PresignedURLOptions{
Query:  &url.Values{},
Header: &http.Header{},
}
opt.Query.Add("x-cos-security-token", "<token>")
// Get presigned
presignedURL, err = c.Object.GetPresignedURL(ctx, http.MethodGet, name, tak, tsk, time.Hour, opt)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
// Get object by presinged url
resp, err = http.Get(presignedURL.String())
if err != nil {
fmt.Printf("Error: %v\n", err)
}
defer resp.Body.Close()
fmt.Println(presignedURL.String())
fmt.Printf("resp:%v\n", resp)
}