对象存储OSS在完成文件(Object)上传时可以提供回调(Callback)给应用服务器。您只需要在发送给OSS的请求中携带相应的Callback参数,即可实现回调。
使用场景
上传回调的一种典型应用场景是结合授权第三方上传时使用。适当使用上传回调机制,能有效降低客户端的逻辑复杂度和网络消耗。上传回调流程如下:
客户端在上传文件到OSS时指定到服务器端的回调。
客户端的上传任务在OSS执行完毕后,OSS会向应用服务器主动发起HTTP请求进行回调。应用服务器对应callbackUrl,且要求必须为公网地址。
应用服务器可以及时得到上传完成的通知,进而完成诸如数据库修改等操作,并向OSS返回上传回调结果。
在回调请求接收到服务器端的响应之后,OSS会将上传结果返回给客户端。
OSS在向应用服务器发送POST回调请求的时候,会在POST请求的Body中包含一些参数来携带特定的信
息。这些参数有两种,一种是系统定义的参数,例如Bucket名称、Object名称等;另外一种是自定义的参数,您可以在发送带回调的请求给OSS时,通过使用自定义参数来携带一些和应用逻辑相关的信息,例如发起请求的用户ID等。
注意事项
目前仅简单上传(PutObject)、表单上传(PostObject)、完成分片上传(CompleteMultipartUpload)操作支持使用上传回调。
上传回调旨在实现文件上传至OSS后,自动触发通知至业务服务器,以执行数据更新或发送通知等后续步骤。回调成功或失败不影响文件上传并保存至OSS。
操作步骤
使用阿里云SDK
以下仅列举常见SDK的上传回调的代码示例。关于其他SDK的上传回调的代码示例,请参见SDK简介。
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import java.io.ByteArrayInputStream;
public class Demo {
public static void main(String[] args) throws Exception{
// Endpoint以华东1(杭州)为例,其它Region请按实际情况填写。
String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
// 填写Bucket名称,例如examplebucket。
String bucketName = "examplebucket";
// 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
String objectName = "exampledir/exampleobject.txt";
// 您的回调服务器地址,例如https://example.com:23450。
String callbackUrl = "yourCallbackServerUrl";
// 创建OSSClient实例。
OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);
try {
String content = "Hello OSS";
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName,new ByteArrayInputStream(content.getBytes()));
// 上传回调参数。
Callback callback = new Callback();
callback.setCallbackUrl(callbackUrl);
//(可选)设置回调请求消息头中Host的值,即您的服务器配置Host的值。
// callback.setCallbackHost("yourCallbackHost");
// 设置发起回调时请求body的值。
callback.setCallbackBody("{\\\"mimeType\\\":${mimeType},\\\"size\\\":${size}}");
// 设置发起回调请求的Content-Type。
callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);
// 设置发起回调请求的自定义参数,由Key和Value组成,Key必须以x:开始。
callback.addCallbackVar("x:var1", "value1");
callback.addCallbackVar("x:var2", "value2");
putObjectRequest.setCallback(callback);
PutObjectResult putObjectResult = ossClient.putObject(putObjectRequest);
// 读取上传回调返回的消息内容。
byte[] buffer = new byte[1024];
putObjectResult.getResponse().getContent().read(buffer);
// 数据读取完成后,获取的流必须关闭,否则会造成连接泄漏,导致请求无连接可用,程序无法正常工作。
putObjectResult.getResponse().getContent().close();
} catch (OSSException oe) {
System.out.println("Caught an OSSException, which means your request made it to OSS, "
+ "but was rejected with an error response for some reason.");
System.out.println("Error Message:" + oe.getErrorMessage());
System.out.println("Error Code:" + oe.getErrorCode());
System.out.println("Request ID:" + oe.getRequestId());
System.out.println("Host ID:" + oe.getHostId());
} catch (Throwable ce) {
System.out.println("Caught an ClientException, which means the client encountered "
+ "a serious internal problem while trying to communicate with OSS, "
+ "such as not being able to access the network.");
System.out.println("Error Message:" + ce.getMessage());
} finally {
if (ossClient != null) {
ossClient.shutdown();
}
}
}
}
<?php
if (is_file(__DIR__ . '/../autoload.php')) {
require_once __DIR__ . '/../autoload.php';
}
if (is_file(__DIR__ . '/../vendor/autoload.php')) {
require_once __DIR__ . '/../vendor/autoload.php';
}
use OSS\Credentials\EnvironmentVariableCredentialsProvider;
use OSS\OssClient;
// 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
$provider = new EnvironmentVariableCredentialsProvider();
// yourEndpoint填写Bucket所在地域对应的Endpoint。以华东1(杭州)为例,Endpoint填写为https://oss-cn-hangzhou.aliyuncs.com。
$endpoint = "yourEndpoint";
// 填写Bucket名称,例如examplebucket。
$bucket= "examplebucket";
// 填写Object完整路径,例如exampledir/exampleobject.txt。Object完整路径中不能包含Bucket名称。
$object = "exampledir/exampleobject.txt";
$config = array(
"provider" => $provider,
"endpoint" => $endpoint,
);
$ossClient = new OssClient($config);
// 上传文件时设置回调。
// callbackUrl为回调服务器地址,例如https://oss-demo.aliyuncs.com:23450。
//(可选)callbackHost为回调请求消息头中Host的值,即您的服务器配置Host的值。
$url =
'{
"callbackUrl":"yourCallbackServerUrl",
"callbackHost":"yourCallbackServerHost",
"callbackBody":"bucket=${bucket}&object=${object}&etag=${etag}&size=${size}&mimeType=${mimeType}&imageInfo.height=${imageInfo.height}&imageInfo.width=${imageInfo.width}&imageInfo.format=${imageInfo.format}&my_var1=${x:var1}&my_var2=${x:var2}",
"callbackBodyType":"application/x-www-form-urlencoded"
}';
// 设置发起回调请求的自定义参数,由Key和Value组成,Key必须以x:开始。
$var =
'{
"x:var1":"value1",
"x:var2":"value2"
}';
$options = array(OssClient::OSS_CALLBACK => $url,
OssClient::OSS_CALLBACK_VAR => $var
);
$result = $ossClient->putObject($bucket, $object, file_get_contents(__FILE__), $options);
print_r($result['body']);
print_r($result['info']['http_code']);
const OSS = require('ali-oss');
varpath=require('path');
const client = new OSS({
// yourregion填写Bucket所在地域。以华东1(杭州)为例,Region填写为oss-cn-hangzhou。
region: 'yourregion',
// 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
accessKeyId: process.env.OSS_ACCESS_KEY_ID,
accessKeySecret: process.env.OSS_ACCESS_KEY_SECRET,
// 填写Bucket名称。
bucket: 'examplebucket'
});
const options = {
callback: {
// 设置回调请求的服务器地址,例如http://oss-demo.aliyuncs.com:23450。
url: 'http://oss-demo.aliyuncs.com:23450',
//(可选)设置回调请求消息头中Host的值,即您的服务器配置Host的值。
//host: 'yourCallbackHost',
// 设置发起回调时请求body的值。
body: 'bucket=${bucket}&object=${object}&var1=${x:var1}&var2=${x:var2}',
// 设置发起回调请求的Content-Type。
contentType: 'application/x-www-form-urlencoded',
// 设置发起回调请求的自定义参数。
customValue: {
var1: 'value1',
var2: 'value2'
}
}
}
async function put () {
try {
// 填写Object完整路径和本地文件的完整路径。Object完整路径中不能包含Bucket名称。
// 如果未指定本地路径,则默认从示例程序所属项目对应本地路径中上传文件。
let result = await client.put('exampleobject.txt', path.normalize('/localpath/examplefile.txt'), options);
console.log(result);
} catch (e) {
console.log(e);
}
}
put();
# -*- coding: utf-8 -*-
import json
import base64
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
# 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
auth = oss2.ProviderAuth(EnvironmentVariableCredentialsProvider())
# yourEndpoint填写Bucket所在地域对应的Endpoint。以华东1(杭州)为例,Endpoint填写为https://oss-cn-hangzhou.aliyuncs.com。
# 填写Bucket名称。
bucket = oss2.Bucket(auth, 'https://oss-cn-hangzhou.aliyuncs.com', 'examplebucket')
# 定义回调参数Base64编码函数。
def encode_callback(callback_params):
cb_str = json.dumps(callback_params).strip()
return oss2.compat.to_string(base64.b64encode(oss2.compat.to_bytes(cb_str)))
# 设置上传回调参数。
callback_params = {}
# 设置回调请求的服务器地址,例如http://oss-demo.aliyuncs.com:23450。
callback_params['callbackUrl'] = 'http://oss-demo.aliyuncs.com:23450'
#(可选)设置回调请求消息头中Host的值,即您的服务器配置Host的值。
#callback_params['callbackHost'] = 'yourCallbackHost'
# 设置发起回调时请求body的值。
callback_params['callbackBody'] = 'bucket=${bucket}&object=${object}'
# 设置发起回调请求的Content-Type。
callback_params['callbackBodyType'] = 'application/x-www-form-urlencoded'
encoded_callback = encode_callback(callback_params)
# 设置发起回调请求的自定义参数,由Key和Value组成,Key必须以x:开始。
callback_var_params = {'x:my_var1': 'my_val1', 'x:my_var2': 'my_val2'}
encoded_callback_var = encode_callback(callback_var_params)
# 上传回调。
params = {'x-oss-callback': encoded_callback, 'x-oss-callback-var': encoded_callback_var}
# 填写Object完整路径和字符串。Object完整路径中不能包含Bucket名称。
result = bucket.put_object('examplefiles/exampleobject.txt', 'a'*1024*1024, params)
using System;
using System.IO;
using System.Text;
using Aliyun.OSS;
using Aliyun.OSS.Common;
using Aliyun.OSS.Util;
namespace Callback
{
class Program
{
static void Main(string[] args)
{
Program.PutObjectCallback();
Console.ReadKey();
}
public static void PutObjectCallback()
{
// 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// 填写Bucket名称,例如examplebucket。
var bucketName = "examplebucket";
// 填写Object完整路径。Object完整路径中不能包含Bucket名称,例如exampledir/exampleobject.txt。
var objectName = "exampledir/exampleobject.txt";
// 填写本地文件的完整路径,例如D:\\localpath\\examplefile.txt。如果未指定本地路径,则默认从示例程序所属项目对应本地路径中上传文件。
var localFilename = "D:\\localpath\\examplefile.txt";
// 设置回调服务器地址,例如https://example.com:23450。
const string callbackUrl = "yourCallbackServerUrl";
// 设置发起回调时请求body的值。
const string callbackBody = "bucket=${bucket}&object=${object}&etag=${etag}&size=${size}&mimeType=${mimeType}&" +
"my_var1=${x:var1}&my_var2=${x:var2}";
// 创建OssClient实例。
var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
try
{
string responseContent = "";
var metadata = BuildCallbackMetadata(callbackUrl, callbackBody);
using (var fs = File.Open(localFilename, FileMode.Open))
{
var putObjectRequest = new PutObjectRequest(bucketName, objectName, fs, metadata);
var result = client.PutObject(putObjectRequest);
responseContent = GetCallbackResponse(result);
}
Console.WriteLine("Put object:{0} succeeded, callback response content:{1}", objectName, responseContent);
}
catch (OssException ex)
{
Console.WriteLine("Failed with error code: {0}; Error info: {1}. \nRequestID: {2}\tHostID: {3}",
ex.ErrorCode, ex.Message, ex.RequestId, ex.HostId);
}
catch (Exception ex)
{
Console.WriteLine("Failed with error info: {0}", ex.Message);
}
}
// 设置上传回调。
private static ObjectMetadata BuildCallbackMetadata(string callbackUrl, string callbackBody)
{
string callbackHeaderBuilder = new CallbackHeaderBuilder(callbackUrl, callbackBody).Build();
string CallbackVariableHeaderBuilder = new CallbackVariableHeaderBuilder().
AddCallbackVariable("x:var1", "x:value1").AddCallbackVariable("x:var2", "x:value2").Build();
var metadata = new ObjectMetadata();
metadata.AddHeader(HttpHeaders.Callback, callbackHeaderBuilder);
metadata.AddHeader(HttpHeaders.CallbackVar, CallbackVariableHeaderBuilder);
return metadata;
}
// 读取上传回调返回的消息内容。
private static string GetCallbackResponse(PutObjectResult putObjectResult)
{
string callbackResponse = null;
using (var stream = putObjectResult.ResponseStream)
{
var buffer = new byte[4 * 1024];
var bytesRead = stream.Read(buffer, 0, buffer.Length);
callbackResponse = Encoding.Default.GetString(buffer, 0, bytesRead);
}
return callbackResponse;
}
}
}
// 构造上传请求。
// 依次填写Bucket名称(例如examplebucket)、Object完整路径(例如exampledir/exampleobject.txt)和本地文件完整路径(例如/storage/emulated/0/oss/examplefile.txt)。
// Object完整路径中不能包含Bucket名称。
PutObjectRequest put = new PutObjectRequest("examplebucket", "exampledir/exampleobject.txt", "/storage/emulated/0/oss/examplefile.txt");
put.setCallbackParam(new HashMap<String, String>() {
{
put("callbackUrl", "http://oss-demo.aliyuncs.com:23450");
put("callbackHost", "yourCallbackHost");
put("callbackBodyType", "application/json");
put("callbackBody", "{\"mimeType\":${mimeType},\"size\":${size}}");
}
});
OSSAsyncTask task = oss.asyncPutObject(put, new OSSCompletedCallback<PutObjectRequest, PutObjectResult>() {
@Override
public void onSuccess(PutObjectRequest request, PutObjectResult result) {
Log.d("PutObject", "UploadSuccess");
// 只有设置了servercallback,该值才有数据。
String serverCallbackReturnJson = result.getServerCallbackReturnBody();
Log.d("servercallback", serverCallbackReturnJson);
}
@Override
public void onFailure(PutObjectRequest request, ClientException clientExcepion, ServiceException serviceException) {
// 异常处理。
}
});
OSSPutObjectRequest * request = [OSSPutObjectRequest new];
// 填写Bucket名称,例如examplebucket。
request.bucketName = @"examplebucket";
// 填写不包含Bucket名称在内的Object完整路径,例如exampledir/exampleobject.txt。
request.objectKey = @"exampledir/exampleobject.txt";
request.uploadingFileURL = [NSURL fileURLWithPath:@<filepath>"];
// 设置回调参数。
request.callbackParam = @{
@"callbackUrl": @"<your server callback address>",
@"callbackBody": @"<your callback body>"
};
// 设置自定义变量。
request.callbackVar = @{
@"<var1>": @"<value1>",
@"<var2>": @"<value2>"
};
request.uploadProgress = ^(int64_t bytesSent, int64_t totalByteSent, int64_t totalBytesExpectedToSend) {
NSLog(@"%lld, %lld, %lld", bytesSent, totalByteSent, totalBytesExpectedToSend);
};
OSSTask * task = [client putObject:request];
[task continueWithBlock:^id(OSSTask *task) {
if (task.error) {
OSSLogError(@"%@", task.error);
} else {
OSSPutObjectResult * result = task.result;
NSLog(@"Result - requestId: %@, headerFields: %@, servercallback: %@",
result.requestId,
result.httpResponseHeaderFields,
result.serverReturnJsonString);
}
return nil;
}];
#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;
int main(void)
{
/* 初始化OSS账号信息。*/
/* 填写Bucket所在地域对应的Endpoint。以华东1(杭州)为例,Endpoint填写为https://oss-cn-hangzhou.aliyuncs.com。*/
std::string Endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
/* 填写Bucket名称,例如examplebucket。*/
std::string BucketName = "examplebucket";
/* 填写Object完整路径,完整路径中不能包含Bucket名称,例如exampledir/exampleobject.txt。*/
std::string ObjectName = "exampledir/exampleobject.txt";
/* 填写您的回调服务器地址。*/
std::string ServerName = "https://example.aliyundoc.com:23450";
/* 初始化网络等资源。*/
InitializeSdk();
ClientConfiguration conf;
/* 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
OssClient client(Endpoint, credentialsProvider, conf);
std::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
*content << "Thank you for using Aliyun Object Storage Service!";
/* 设置上传回调参数。*/
std::string callbackBody = "bucket=${bucket}&object=${object}&etag=${etag}&size=${size}&mimeType=${mimeType}&my_var1=${x:var1}";
ObjectCallbackBuilder builder(ServerName, callbackBody, "", ObjectCallbackBuilder::Type::URL);
std::string value = builder.build();
ObjectCallbackVariableBuilder varBuilder;
varBuilder.addCallbackVariable("x:var1", "value1");
std::string varValue = varBuilder.build();
PutObjectRequest request(BucketName, ObjectName, content);
request.MetaData().addHeader("x-oss-callback", value);
request.MetaData().addHeader("x-oss-callback-var", varValue);
auto outcome = client.PutObject(request);
/* 释放网络等资源。*/
ShutdownSdk();
return 0;
}
#include "oss_api.h"
#include "aos_http_io.h"
/* yourEndpoint填写Bucket所在地域对应的Endpoint。以华东1(杭州)为例,Endpoint填写为https://oss-cn-hangzhou.aliyuncs.com。*/
const char *endpoint = "yourEndpoint";
/* 填写Bucket名称,例如examplebucket。*/
const char *bucket_name = "examplebucket";
/* 填写Object完整路径,完整路径中不能包含Bucket名称,例如exampledir/exampleobject.txt。*/
const char *object_name = "exampledir/exampleobject.txt";
const char *object_content = "More than just cloud.";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* 用char*类型的字符串初始化aos_string_t类型。*/
aos_str_set(&options->config->endpoint, endpoint);
/* 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
/* 是否使用了CNAME。0表示不使用。*/
options->config->is_cname = 0;
/* 设置网络相关参数,比如超时时间等。*/
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
aos_pool_t *p = NULL;
aos_status_t *s = NULL;
aos_string_t bucket;
aos_string_t object;
aos_table_t *headers = NULL;
oss_request_options_t *options = NULL;
aos_table_t *resp_headers = NULL;
aos_list_t resp_body;
aos_list_t buffer;
aos_buf_t *content;
char *buf = NULL;
int64_t len = 0;
int64_t size = 0;
int64_t pos = 0;
char b64_buf[1024];
int b64_len;
/* 采用JSON格式。*/
/*(可选)设置回调请求消息头中Host的值,如您的服务器配置Host的值。*/
char *callback = "{"
"\"callbackUrl\":\"http://oss-demo.aliyuncs.com:23450\","
"\"callbackHost\":\"yourCallbackHost\","
"\"callbackBody\":\"bucket=${bucket}&object=${object}&size=${size}&mimeType=${mimeType}\","
"\"callbackBodyType\":\"application/x-www-form-urlencoded\""
"}";
/* 在程序入口调用aos_http_io_initialize方法来初始化网络、内存等全局资源。*/
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* 初始化参数。*/
aos_pool_create(&p, NULL);
options = oss_request_options_create(p);
init_options(options);
aos_str_set(&bucket, bucket_name);
aos_str_set(&object, object_name);
aos_list_init(&resp_body);
aos_list_init(&buffer);
content = aos_buf_pack(options->pool, object_content, strlen(object_content));
aos_list_add_tail(&content->node, &buffer);
/* 将callback放入header。*/
b64_len = aos_base64_encode((unsigned char*)callback, strlen(callback), b64_buf);
b64_buf[b64_len] = '\0';
headers = aos_table_make(p, 1);
apr_table_set(headers, OSS_CALLBACK, b64_buf);
/* 上传回调。*/
s = oss_do_put_object_from_buffer(options, &bucket, &object, &buffer,
headers, NULL, NULL, &resp_headers, &resp_body);
if (aos_status_is_ok(s)) {
printf("put object from buffer succeeded\n");
} else {
printf("put object from buffer failed\n");
}
/* 获取buffer长度。*/
len = aos_buf_list_len(&resp_body);
buf = (char *)aos_pcalloc(p, (apr_size_t)(len + 1));
buf[len] = '\0';
/* 拷贝buffer内容到内存。*/
aos_list_for_each_entry(aos_buf_t, content, &resp_body, node) {
size = aos_buf_size(content);
memcpy(buf + pos, content->pos, (size_t)size);
pos += size;
}
/* 释放内存池,相当于释放了请求过程中各资源分配的内存。*/
aos_pool_destroy(p);
/* 释放之前分配的全局资源。*/
aos_http_io_deinitialize();
return 0;
}
require 'aliyun/oss'
client = Aliyun::OSS::Client.new(
# Endpoint以华东1(杭州)为例,其它Region请按实际情况填写。
endpoint: 'https://oss-cn-hangzhou.aliyuncs.com',
# 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
access_key_id: ENV['OSS_ACCESS_KEY_ID'],
access_key_secret: ENV['OSS_ACCESS_KEY_SECRET']
)
# 填写Bucket名称,例如examplebucket。
bucket = client.get_bucket('examplebucket')
callback = Aliyun::OSS::Callback.new(
url: 'http://oss-demo.aliyuncs.com:23450',
query: {user: 'put_object'},
body: 'bucket=${bucket}&object=${object}'
)
begin
bucket.put_object('files/hello', file: '/tmp/x', callback: callback)
rescue Aliyun::OSS::CallbackError => e
puts "Callback failed: #{e.message}"
end
使用REST API
如果您的程序自定义要求较高,您可以直接发起REST API请求。直接发起REST API请求需要手动编写代码计算签名。更多信息,请参见Callback。
相关文档
关于上传回调中的常见错误及错误排查,请参见上传回调错误及排除。
关于基于Post Policy的使用规则在服务端通过各语言SDK代码完成签名,并且设置上传回调,然后通过表单直传数据到OSS的具体操作,请参见服务端签名直传并设置上传回调。
关于搭建基于OSS的移动应用数据直传服务并设置上传回调的具体操作,请参见快速搭建移动应用上传回调服务。