Torch Object Storage
Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceGoObject InterfaceUpload ObjectUpload Callback (Go SDK)
Copy page
Download PDFUpload Object
Upload Callback (Go SDK)
Copy pageDownload PDFUpload Callback (Go SDK)
An upload callback refers to a process in which the client includes a callback parameter in its request. After the upload is completed, the server sends a synchronous POST callback request to the third-party application server specified in the callback parameter. Only after the third-party server confirms receipt and returns a result does the server return all results to the client.
Sample Code
Standard Upload: Upload Callback Implementation
package main
import (
"context"
"encoding/base64"
"fmt"
"os"
"strings"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
)
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
ak = os.Getenv("TOS_ACCESS_KEY")
sk = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
objectKey = "*** Provide your object key ***"
callbackUrl = "*** Provide your callback url ***"
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(ak, sk)))
checkErr(err)
callback := `
{
"callbackUrl" : "` + callbackUrl + `",
"callbackBody" : "{\"bucket\": ${bucket}, \"object\": ${object}, \"key1\": ${x:key1}}",
"callbackBodyType" : "application/json"
}`
callbackVar := `
{
"x:key1" : "ceshi"
}`
body := strings.NewReader("object content")
output, err := client.PutObjectV2(context.Background(), &tos.PutObjectV2Input{
PutObjectBasicInput: tos.PutObjectBasicInput{
Bucket: bucketName,
Key: objectKey,
Callback: base64.StdEncoding.EncodeToString([]byte(callback)),
CallbackVar: base64.StdEncoding.EncodeToString([]byte(callbackVar)),
},
Content: body,
})
checkErr(err)
fmt.Println("Put Object Request ID: ", output.RequestID)
fmt.Println("Put Object Response Status Code: ", output.StatusCode)
}
Implementing upload callbacks for chunked uploads
package main
import (
"context"
"encoding/base64"
"fmt"
"os"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
)
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
accessKey = os.Getenv("TOS_ACCESS_KEY")
secretKey = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
objectKey = "*** Provide your object name ***"
ctx = context.Background()
uploadId = "*** Provide your upload id ***"
parts = make([]tos.UploadedPartV2, 0)
callbackUrl = "*** Provide your callback url ***"
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
callback := `
{
"callbackUrl" : "` + callbackUrl + `",
"callbackBody" : "{\"bucket\": ${bucket}, \"object\": ${object}, \"key1\": ${x:key1}}",
"callbackBodyType" : "application/json"
}`
callbackVar := `
{
"x:key1" : "ceshi"
}`
completeOutput, err := client.CompleteMultipartUploadV2(ctx, &tos.CompleteMultipartUploadV2Input{
Bucket: bucketName,
Key: objectKey,
UploadID: uploadId,
Parts: parts,
Callback: base64.StdEncoding.EncodeToString([]byte(callback)),
CallbackVar: base64.StdEncoding.EncodeToString([]byte(callbackVar)),
})
checkErr(err)
fmt.Println("CompleteMultipartUploadV2 Request ID:", completeOutput.RequestID)
}
Sample Code for Verifying Callback Signatures
package main
import (
"bytes"
"crypto"
"crypto/md5"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"net/http"
"sort"
)
const Authorization = "Authorization"
const XTosPublicKeyUrl = "x-tos-pub-key-url"
func calcStringToSign(req *http.Request, body []byte) []byte {
buf := bytes.NewBuffer(nil)
buf.WriteString(req.URL.Path)
query := req.URL.Query()
if len(query) > 0 {
buf.WriteByte('?')
keys := make([]string, 0, len(query))
for key := range query {
keys = append(keys, key)
}
sort.Strings(keys)
for _, key := range keys {
values := query[key]
for _, value := range values {
buf.WriteString(key)
buf.WriteByte('=')
buf.WriteString(value)
buf.WriteByte('&')
}
}
buf.Truncate(buf.Len() - 1)
}
buf.WriteByte('\n')
buf.Write(body)
return buf.Bytes()
}
func getSignature(r *http.Request) ([]byte, error) {
authorization := r.Header.Get(Authorization)
if authorization == "" {
return nil, nil
}
return base64.StdEncoding.DecodeString(authorization)
}
func getPublicKey(r *http.Request) ([]byte, error) {
var bytePublicKey []byte
publicKeyURLBase64 := r.Header.Get(XTosPublicKeyUrl)
if publicKeyURLBase64 == "" {
return bytePublicKey, errors.New("no x-tos-pub-key-url field in request header ")
}
publicKeyURL, _ := base64.StdEncoding.DecodeString(publicKeyURLBase64)
resp, err := http.Get(string(publicKeyURL))
if err != nil {
return bytePublicKey, err
}
bytePublicKey, err = ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
return bytePublicKey, err
}
if resp.StatusCode >= http.StatusBadRequest {
return nil, errors.New("get public key failed")
}
return bytePublicKey, nil
}
func getContentAndSignMD5(r *http.Request) ([]byte, []byte, error) {
bodyContent, err := ioutil.ReadAll(r.Body)
_ = r.Body.Close()
if err != nil {
return nil, nil, err
}
stringToSign := calcStringToSign(r, bodyContent)
authMd5 := md5.New()
authMd5.Write(stringToSign)
signMd5 := authMd5.Sum(nil)
return signMd5, bodyContent, nil
}
func verifySignature(publicKey []byte, signMd5 []byte, sign []byte) error {
pubBlock, _ := pem.Decode(publicKey)
if pubBlock == nil {
return errors.New("invalid public key pem")
}
pubInterface, err := x509.ParsePKIXPublicKey(pubBlock.Bytes)
if err != nil || pubInterface == nil {
return errors.New("invalid public key pem")
}
pub := pubInterface.(*rsa.PublicKey)
err = rsa.VerifyPKCS1v15(pub, crypto.MD5, signMd5, sign)
if err != nil {
return err
}
return nil
}
func CallbackHandler(w http.ResponseWriter, r *http.Request) {
sign, err := getSignature(r)
if err != nil {
fmt.Println("get callback signature err:", err.Error())
w.WriteHeader(http.StatusBadRequest)
return
}
publicKey, err := getPublicKey(r)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
signMd5, body, err := getContentAndSignMD5(r)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
if err = verifySignature(publicKey, signMd5, sign); err != nil {
w.WriteHeader(http.StatusUnauthorized)
return
}
fmt.Println(body)
w.WriteHeader(http.StatusOK)
w.Write([]byte(`{"msg":"ok"}`))
return
}
Last updated: 2025.09.19 17:30:20
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