golang http form 上传图片文件

参考自：

https://blog.csdn.net/u011304970/article/details/71081984

https://blog.cyeam.com/go/2019/03/15/form-post

 

func TestPicUpload(t *testing.T) {
	// 签名
	keyMap := make(map[string]string)
	keyMap["version"] = "1.0"
	keyMap["clientCode"] = "48310016"
	keyMap["picMode"] = "01"
	signature := GetSignature(keyMap, "fudhsyrgnbpdeibh") // A6004E72EE46C6A97451EBD7543EA58F

	buf := new(bytes.Buffer)
	writer := multipart.NewWriter(buf)
	_ = writer.WriteField("version", "1.0")
	_ = writer.WriteField("clientCode", "48310016")
	_ = writer.WriteField("picMode", "01")
	_ = writer.WriteField("MAC", signature)                        // 不参与签名
	formFile, err := writer.CreateFormFile("fileName", "test.jpg") // 不参与签名
	if err != nil {
		t.Fatalf("create form file failed: %s", err)
	}

	// 从文件读取数据，写入表单
	srcFile, err := os.Open("test.jpg")
	if err != nil {
		t.Fatalf("open source file failed: %s", err)
	}
	defer srcFile.Close()
	_, err = io.Copy(formFile, srcFile)
	if err != nil {
		t.Fatalf("write to form file falied: %s", err)
	}

	tr := &http.Transport{
		TLSClientConfig:   &tls.Config{InsecureSkipVerify: true},
	}

	req, err := http.NewRequest("POST", "https://.../imgUpl", buf)
	if err != nil {
		fmt.Println("发送报文失败", err)
		return

	}
	req.Header.Set("Content-Type", writer.FormDataContentType())
	client := &http.Client{Transport: tr, Timeout: time.Second * time.Duration(60)}
	writer.Close()    ////
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println("发送请求失败：", err)
		return
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatalf("readAll falied: %s", err)
	}

	t.Logf("body: %s", string(body))
	assert.Equal(t, 200, resp.StatusCode)
}

func GetSignature(keyMap map[string]string, key string) string {
	keySli := make([]string, 0)
	for key := range keyMap {
		keySli = append(keySli, key)
	}
	sort.Strings(keySli)

	keySli = append(keySli, "key")
	keyMap["key"] = key

	var signBody string
	for _, k := range keySli {
		signBody += fmt.Sprintf("%s=%s&", k, keyMap[k])
	}
	signBody = signBody[:len(signBody)-1]
	res := md5.Sum([]byte(signBody))

	return strings.ToUpper(hex.EncodeToString(res[:]))
}