Object Storage Service:Upload objects directly to OSS from clients

import json
from alibabacloud_tea_openapi.models import Config
from alibabacloud_sts20150401.client import Client as Sts20150401Client
from alibabacloud_sts20150401 import models as sts_20150401_models
from alibabacloud_credentials.client import Client as CredentialClient

# Replace <YOUR_ROLE_ARN> with the Alibaba Cloud Resource Name (ARN) of the RAM role that has the permissions to upload objects to the OSS bucket. 
role_arn_for_oss_upload = '<YOUR_ROLE_ARN>'
# Replace <YOUR_REGION_ID> with the ID of the region of the STS service. Example: cn-hangzhou. 
region_id = '<YOUR_REGION_ID>'

def get_sts_token():
    # If you do not specify parameters when you initialize CredentialClient, the default credential chain is used. 
    # If you run the program on your local computer, you can specify the AccessKey pair by configuring the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variables.
    # If you run the program on an Elastic Compute Service (ECS) instance, an elastic container instance, or a node in a Container Service for Kubernetes (ACK) cluster, you can specify the bound instance or node by configuring the ALIBABA_CLOUD_ECS_METADATA environment variable. The SDK automatically exchanges the temporary access credentials obtained from STS. 
    config = Config(region_id=region_id, credential=CredentialClient())
    sts_client = Sts20150401Client(config=config)
    assume_role_request = sts_20150401_models.AssumeRoleRequest(
        role_arn=role_arn_for_oss_upload,
        # Replace <YOUR_ROLE_SESSION_NAME> with a custom session name, such as oss-role-session. 
        role_session_name='<YOUR_ROLE_SESSION_NAME>'
    )
    response = sts_client.assume_role(assume_role_request)
    token = json.dumps(response.body.credentials.to_map())
    return token

import com.aliyun.sts20150401.Client;
import com.aliyun.sts20150401.models.AssumeRoleRequest;
import com.aliyun.sts20150401.models.AssumeRoleResponse;
import com.aliyun.sts20150401.models.AssumeRoleResponseBody;
import com.aliyun.tea.TeaException;
import com.aliyun.teautil.models.RuntimeOptions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.aliyun.teaopenapi.models.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import static com.aliyun.teautil.Common.assertAsString;

@RestController
public class StsController {

    @Autowired
    private Client stsClient;

    @GetMapping("/get_sts_token_for_oss_upload")
    public AssumeRoleResponseBody.AssumeRoleResponseBodyCredentials generateStsToken() {
        AssumeRoleRequest assumeRoleRequest = new AssumeRoleRequest()
            .setDurationSeconds(3600L)
            // Replace <YOUR_ROLE_SESSION_NAME> with a custom session name, such as my-website-server. 
            .setRoleSessionName("<YOUR_ROLE_SESSION_NAME>")
            // Replace <YOUR_ROLE_ARN> with the ARN of the RAM role that has the permissions to upload objects to the specified bucket. You can obtain the ARN of a RAM role on the RAM role details page. 
        RuntimeOptions runtime = new RuntimeOptions();
        try {
            AssumeRoleResponse response = stsClient.assumeRoleWithOptions(assumeRoleRequest, runtime);
            return response.body.credentials;
        } catch (TeaException error) {
            // Print the error if necessary.
            assertAsString(error.message);
            return null;
        } catch (Exception error) {
            TeaException error = new TeaException(_error.getMessage(), _error);
            // Print the error if necessary.
            assertAsString(error.message);
            return null;
        }
    }
}

@Configuration
public class StsClientConfiguration {

    @Bean
    public Client stsClient() {
        // If you do not specify any parameters when you initialize the credentials client, the Credentials tool uses the default credential chain to initialize the client. 
        Config config = new Config();
        config.endpoint = "sts.cn-hangzhou.aliyuncs.com";
        try {
            com.aliyun.credentials.Client credentials = new com.aliyun.credentials.Client();
            config.setCredential(credentials);
            return new Client(config);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

package main

import (
    "encoding/json"
    "net/http"
    "os"

    openapi "github.com/alibabacloud-go/darabonba-openapi/v2/client"
    sts20150401 "github.com/alibabacloud-go/sts-20150401/v2/client"
    util "github.com/alibabacloud-go/tea-utils/v2/service"
    "github.com/alibabacloud-go/tea/tea"
)

/**
 * Use your AccessKey ID and AccessKey secret to initialize the client.
 * @param accessKeyId
 * @param accessKeySecret
 * @return Client
 * @throws Exception
 */
func CreateClient(accessKeyId *string, accessKeySecret *string) (*sts20150401.Client, error) {
    config := &openapi.Config{
    // (Required) Specify your AccessKey ID.
    AccessKeyId: accessKeyId,
    // (Required) Specify your AccessKey secret.
    AccessKeySecret: accessKeySecret,
    }
    // For more information about endpoints, visit https://api.aliyun.com/product/Sts.
    config.Endpoint = tea.String("sts.cn-hangzhou.aliyuncs.com")
    return sts20150401.NewClient(config)
}

func AssumeRole(client *sts20150401.Client) (*sts20150401.AssumeRoleResponse, error) {
    assumeRoleRequest := &sts20150401.AssumeRoleRequest{
    DurationSeconds: tea.Int64(3600),
    RoleArn:         tea.String("acs:ram::1379186349531844:role/admin-oss"),
    RoleSessionName: tea.String("peiyu-demo"),
    }
    return client.AssumeRoleWithOptions(assumeRoleRequest, &util.RuntimeOptions{})
}

func handler(w http.ResponseWriter, r *http.Request) {
    if r.URL.Path == "/" {
    http.ServeFile(w, r, "templates/index.html")
    return
    } else if r.URL.Path == "/get_sts_token_for_oss_upload" {
    client, err := CreateClient(tea.String(os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_ID")), tea.String(os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")))
    if err != nil {
    panic(err)
    }
    assumeRoleResponse, err := AssumeRole(client)
    if err != nil {
    panic(err)
    }
    responseBytes, err := json.Marshal(assumeRoleResponse)
    if err != nil {
    panic(err)
    }
    w.Header().Set("Content-Type", "application/json")
    w.Write(responseBytes)
    return
    }
    http.NotFound(w, r)
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

<?php
require_once 'vendor/autoload.php';
use AlibabaCloud\Client\AlibabaCloud;
use AlibabaCloud\Client\Exception\ClientException;
use AlibabaCloud\Client\Exception\ServerException;
use AlibabaCloud\Sts\Sts;
// Initialize the AlibabaCloud client. 
AlibabaCloud::accessKeyClient(getenv('ALIBABA_CLOUD_ACCESS_KEY_ID'), getenv('ALIBABA_CLOUD_ACCESS_KEY_SECRET'))
    ->regionId('cn-hangzhou')
    ->asDefaultClient();
// Create a request to obtain temporary access credentials from STS. 
$request = Sts::v20150401()->assumeRole();
// Initiate the STS request and obtain the result. 
// Replace <YOUR_ROLE_SESSION_NAME> with a custom session name, such as oss-role-session. 
// Replace <YOUR_ROLE_ARN> with the ARN of the RAM role that has the permissions to upload objects to the specified bucket. 
$result = $request
    ->withRoleSessionName("<YOUR_ROLE_SESSION_NAME>")
    ->withDurationSeconds(3600)
    ->withRoleArn("<YOUR_ROLE_ARN>")
    ->request();
// Obtain the credential information in the STS request result. 
$credentials = $result->get('Credentials');
// Construct JSON data from the returned result. 
$response = [
    'AccessKeyId' => $credentials['AccessKeyId'],
    'AccessKeySecret' => $credentials['AccessKeySecret'],
    'SecurityToken' => $credentials['SecurityToken'],
];
// Set the Content-Type response header to application/json. 
header('Content-Type: application/json');
// Convert the result to JSON data and print the result. 
echo json_encode(['Credentials' => $response]);
?>

const express = require("express");
const { STS } = require('ali-oss');

const app = express();
const path = require("path");

app.use(express.static(path.join(__dirname, "templates")));
// Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
const accessKeyId = process.env.ALIBABA_CLOUD_ACCESS_KEY_ID;
// Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_SECRET environment variable. 
const accessKeySecret = process.env.ALIBABA_CLOUD_ACCESS_SECRET;

app.get('/get_sts_token_for_oss_upload', (req, res) => {
  let sts = new STS({
   accessKeyId: accessKeyId,
   accessKeySecret: accessKeySecret
 });
   // Specify the ARN of the role that was obtained in Step 2. Example: acs:ram::175708322470****:role/ramtest. 
   // Specify a custom policy to limit the permissions of the temporary access credentials. If you do not specify a custom policy, the returned temporary access credentials have full permissions of the specified RAM role. 
   // Specify the expiration time in seconds for the access credentials. In this example, the expiration time is 3,000 seconds. 
   // Specify a custom role session name, which is used to distinguish different tokens. Example: sessiontest. 
   sts.assumeRole('<YOUR_ROLE_ARN>', ``, '3000', 'sessiontest').then((result) => {
     console.log(result);
     res.json({
       AccessKeyId: result.credentials.AccessKeyId,
       AccessKeySecret: result.credentials.AccessKeySecret,
       SecurityToken: result.credentials.SecurityToken,
     });
   }).catch((err) => {
     console.log(err);
     res.status(400).json(err.message);
   });
 });

app.listen(8000, () => {
  console.log("http://127.0.0.1:8000");
});

require 'sinatra'
require 'base64'
require 'open-uri'
require 'cgi'
require 'openssl'
require 'json'
require 'sinatra/reloader'
require 'sinatra/content_for'
require 'aliyunsdkcore'

# Specify the path of the public-folder folder to the templates subfolder within the current folder.
set :public_folder, File.dirname(__FILE__) + '/templates'

def get_sts_token_for_oss_upload()
  client = RPCClient.new(
    # Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
    access_key_id: ENV['ALIBABA_CLOUD_ACCESS_KEY_ID'],
    # Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable. 
    access_key_secret: ENV['ALIBABA_CLOUD_ACCESS_KEY_SECRET'],
    endpoint: 'https://sts.cn-hangzhou.aliyuncs.com',
    api_version: '2015-04-01'
  )
  response = client.request(
    action: 'AssumeRole',
    params: {
      # Specify the ARN of the role that was obtained in Step 2. Example: acs:ram::175708322470****:role/ramtest. 
      "RoleArn": "acs:ram::175708322470****:role/ramtest",
      # Specify the expiration time in seconds for the access credentials. In this example, the expiration time is 3,000 seconds. 
      "DurationSeconds": 3600,
      # Specify a custom role session name, which is used to distinguish different tokens. Example: sessiontest. 
      "RoleSessionName": "sessiontest"
    },
    opts: {
      method: 'POST',
      format_params: true
    }
  )
end

if ARGV.length == 1 
  $server_port = ARGV[0]
elsif ARGV.length == 2
  $server_ip = ARGV[0]
  $server_port = ARGV[1]
end

$server_ip = "0.0.0.0"
$server_port = 8000

puts "App server is running on: http://#{$server_ip}:#{$server_port}"

set :bind, $server_ip
set :port, $server_port

get '/get_sts_token_for_oss_upload' do
  token = get_sts_token_for_oss_upload()
  response = {
    "AccessKeyId" => token["Credentials"]["AccessKeyId"],
    "AccessKeySecret" => token["Credentials"]["AccessKeySecret"],
    "SecurityToken" => token["Credentials"]["SecurityToken"]
  }
  response.to_json
end

get '/*' do
  puts "********************* GET "
  send_file File.join(settings.public_folder, 'index.html')
end

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Aliyun.OSS;
using System;
using System.IO;
using AlibabaCloud.SDK.Sts20150401;
using System.Text.Json;
namespace YourNamespace
{
    public class Program
    {
        private ILogger<Program> _logger;
        public static AlibabaCloud.SDK.Sts20150401.Client CreateClient(string accessKeyId, string accessKeySecret)
        {
            var config = new AlibabaCloud.OpenApiClient.Models.Config
            {
                AccessKeyId = accessKeyId,
                AccessKeySecret = accessKeySecret,
                Endpoint = "sts.cn-hangzhou.aliyuncs.com"
            };
            return new AlibabaCloud.SDK.Sts20150401.Client(config);
        }
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);
            var app = builder.Build();
            builder.Logging.AddConsole();
            var serviceProvider = builder.Services.BuildServiceProvider();
            var logger = serviceProvider.GetRequiredService<ILogger<Program>>();
            app.UseStaticFiles();
            app.MapGet("/", async (context) =>
            {
                var filePath = Path.Combine(Directory.GetCurrentDirectory(), "templates/index.html");
                var htmlContent = await File.ReadAllTextAsync(filePath);
                await context.Response.WriteAsync(htmlContent);
                logger.LogInformation("GET request to root path");
            });
            app.MapGet("/get_sts_token_for_oss_upload", async (context) =>
            {
                var program = new Program(logger);
                var client = CreateClient(Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_ID"), Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_SECRET"));
                var assumeRoleRequest = new AlibabaCloud.SDK.Sts20150401.Models.AssumeRoleRequest();
                // Replace <YOUR_ROLE_SESSION_NAME> with a custom session name, such as oss-role-session. 
                assumeRoleRequest.RoleSessionName = "<YOUR_ROLE_SESSION_NAME>";
                // Replace <YOUR_ROLE_ARN> with the ARN of the RAM role that has the permissions to upload objects to the specified bucket. 
                assumeRoleRequest.RoleArn = "<YOUR_ROLE_ARN>";
                assumeRoleRequest.DurationSeconds = 3600;
                var runtime = new AlibabaCloud.TeaUtil.Models.RuntimeOptions();
                var response = client.AssumeRoleWithOptions(assumeRoleRequest, runtime);
                var credentials = response.Body.Credentials;
                var jsonResponse = JsonSerializer.Serialize(new
                {
                    AccessKeyId = credentials.AccessKeyId,
                    AccessKeySecret = credentials.AccessKeySecret,
                    Expiration = credentials.Expiration,
                    SecurityToken = credentials.SecurityToken
                });
                context.Response.ContentType = "application/json";
                await context.Response.WriteAsync(jsonResponse);
            });
            app.Run();
        }
        public Program(ILogger<Program> logger)
        {
            _logger = logger;
        }
    }
}

let credentials = null;
const form = document.querySelector("form");
form.addEventListener("submit", async (event) => {
  event.preventDefault();
  // Obtain temporary access credentials again only if they expire. This reduces the number of calls to STS. 
  if (isCredentialsExpired(credentials)) {
    const response = await fetch("/get_sts_token_for_oss_upload", {
      method: "GET",
    });
    credentials = await response.json();
  }
  const client = new OSS({
    // Replace <YOUR_BUCKET> with the name of the OSS bucket. 
    bucket: "<YOUR_BUCKET>",
    // Replace <YOUR_REGION> with the ID of the region in which the OSS bucket is located. Example: oss-cn-hangzhou. 
    region: "oss-<YOUR_REGION>",
    accessKeyId: credentials.AccessKeyId,
    accessKeySecret: credentials.AccessKeySecret,
    stsToken: credentials.SecurityToken,
  });

  const fileInput = document.querySelector("#file");
  const file = fileInput.files[0];
  const result = await client.put(file.name, file);
  console.log(result);
});

/**
 * Determine whether the temporary access credentials expire. 
 **/
function isCredentialsExpired(credentials) {
  if (!credentials) {
    return true;
  }
  const expireDate = new Date(credentials.Expiration);
  const now = new Date();
  // If the remaining validity period of the temporary access credentials is less than 1 minute, the temporary access credentials are considered expired. 
  return expireDate.getTime() - now.getTime() <= 60000;
}

import os
from hashlib import sha1 as sha
import json
import base64
import hmac
import datetime
import time

# Obtain the AccessKey ID from the OSS_ACCESS_KEY_ID environment variable. 
access_key_id = os.environ.get('OSS_ACCESS_KEY_ID')
# Obtain the AccessKey secret from the OSS_ACCESS_KEY_SECRET environment variable. 
access_key_secret = os.environ.get('OSS_ACCESS_KEY_SECRET')
# Replace <YOUR_BUCKET> with the name of the bucket. 
bucket = '<YOUR_BUCKET>'
# Set host to a value that is in the BucketName.Endpoint format. Replace <YOUR_BUCKET> with the name of the bucket. Replace <YOUR_ENDPOINT> with the endpoint of the region in which the bucket is located, such as oss-cn-hangzhou.aliyuncs.com. 
host = 'https://<YOUR_BUCKET>.<YOUR_ENDPOINT>'
# Specify the prefix in the name of the object that you want to upload to OSS. 
upload_dir = 'user-dir-prefix/'
# Specify the validity period. Unit: seconds. 
expire_time = 3600


def generate_expiration(seconds):
    """
    The expiration time is calculated based on the specified validity period. Unit: seconds. 
    :param seconds: the validity period (seconds). 
    :return: the time string in the ISO 8601 standard. Example: 2014-12-01T12:00:00.000Z. 
    """
    now = int(time.time())
    expiration_time = now + seconds
    gmt = datetime.datetime.utcfromtimestamp(expiration_time).isoformat()
    gmt += 'Z'
    return gmt


def generate_signature(access_key_secret, expiration, conditions, policy_extra_props=None):
    """
    Generate a signature string. 
    :param access_key_secret: the AccessKey secret that has the permissions to access the bucket. 
    :param expiration: the time when the signature expires. Specify the time in the ISO 8601 standard in the yyyy-MM-ddTHH:mm:ssZ format. Example: 2014-12-01T12:00:00.000Z. 
    :param conditions: the policy conditions that can be used to limit the values that you can specify during form upload. 
    :param policy_extra_props: the additional policy parameters. You can pass additional parameters as a dict. 
    :return: the signature string. 
    """
    policy_dict = {
        'expiration': expiration,
        'conditions': conditions
    }
    if policy_extra_props is not None:
        policy_dict.update(policy_extra_props)
    policy = json.dumps(policy_dict).strip()
    policy_encode = base64.b64encode(policy.encode())
    h = hmac.new(access_key_secret.encode(), policy_encode, sha)
    sign_result = base64.b64encode(h.digest()).strip()
    return sign_result.decode()

def generate_upload_params():
    policy = {
        # Specify the validity period of the policy. 
        "expiration": generate_expiration(expire_time),
        # Specify the policy conditions. 
        "conditions": [
            # If success_action_redirect is not specified, HTTP status code 204 is returned after the object is uploaded. 
            ["eq", "$success_action_status", "200"],
            # The value of the form field must start with the specified prefix. For example, if the value of the key form field starts with user/user1, the condition is ["starts-with", "$key", "user/user1"]. 
            ["starts-with", "$key", upload_dir],
            # Specify the minimum and maximum sizes of the object that can be uploaded. Unit: bytes. 
            ["content-length-range", 1, 1000000],
            # Set the type of the object that you want to upload to the specified image type.
            ["in", "$content-type", ["image/jpg", "image/png"]]
        ]
    }
    signature = generate_signature(access_key_secret, policy.get('expiration'), policy.get('conditions'))
    response = {
        'policy': base64.b64encode(json.dumps(policy).encode('utf-8')).decode(),
        'ossAccessKeyId': access_key_id,
        'signature': signature,
        'host': host,
        'dir': upload_dir
        # Specify additional parameters.
    }
    return json.dumps(response)

import com.aliyun.help.demo.uploading_to_oss_directly_postsignature.config.OssConfig;
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.codehaus.jettison.json.JSONObject;
import java.util.Date;
import com.aliyun.oss.OSSClientBuilder;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Bean;
import javax.annotation.PreDestroy;

@Controller
public class PostSignatureController {
    @Autowired
    private OSS ossClient;

    @Autowired
    private OssConfig ossConfig;

    @GetMapping("/get_post_signature_for_oss_upload")
    @ResponseBody
    public String generatePostSignature() {
        JSONObject response = new JSONObject();
        try {
            long expireEndTime = System.currentTimeMillis() + ossConfig.getExpireTime() * 1000;
            Date expiration = new Date(expireEndTime);
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, ossConfig.getDir());
            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);
            response.put("ossAccessKeyId", ossConfig.getAccessKeyId());
            response.put("policy", encodedPolicy);
            response.put("signature", postSignature);
            response.put("dir", ossConfig.getDir());
            response.put("host", ossConfig.getHost());
        } 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.");
        // Assume that the method exists.
        System.out.println("HTTP Status Code: " + oe.getRawResponseError()); 
        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 (ClientException 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();
        }
        return response.toString();
    }
  }
}

@Configuration
public class OssConfig {
    /**
     * Replace <YOUR-ENDPOINT> with the endpoint of the region in which the bucket is located, such as oss-cn-hangzhou.aliyuncs.com.
     */
    private String endpoint = "<YOUR-ENDPOINT>";
    /**
     * Replace <YOUR-BUCKET> with the name of the bucket.
     */
    private String bucket = "<YOUR-BUCKET>";
    /**
     * Specify the prefix in the name of the object in OSS.
     */
    private String dir = "user-dir-prefix/";
    /**
     * Specify the expiration time. Unit: seconds.
     */
    private long expireTime = 3600;
    /**
     * Create a host.
     */
    private String host = "http://" + bucket + "." + endpoint;
    /**
     * Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable.
     */
    private String accessKeyId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
    /**
     * Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable.
     */
    private String accessKeySecret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");

    private OSS ossClient;
    @Bean
    public OSS getOssClient() {
        ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        return ossClient;
    }
    @Bean
    public String getHost() {
        return host;
    }
    @Bean
    public String getAccessKeyId() {
        return accessKeyId;
    }
    @Bean
    public long getExpireTime() {
        return expireTime;
    }
    @Bean
    public String getDir() {
        return dir;
    }

    @PreDestroy
    public void onDestroy() {
        ossClient.shutdown();
    }
}

package main

import (
    "crypto/hmac"
    "crypto/sha1"
    "encoding/base64"
    "encoding/json"
    "fmt"
    "io"
    "net/http"
    "os"
    "time"
)

var (
    // Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
    accessKeyId = os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_ID")
    // Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable. 
    accessKeySecret = os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")
    // specify the host. The host is in the BucketName.Endpoint format. Replace ${your-bucket} with the name of the bucket. Replace ${your-endpoint} with the OSS endpoint, such as oss-cn-hangzhou.aliyuncs.com. 
    host = "http://${your-bucket}.${your-endpoint}"
    // Specify the prefix in the name of the object that you want to upload to OSS. 
    uploadDir = "user-dir-prefix/"
    // Specify the expiration time. Unit: seconds. 
    expireTime = int64(3600)
)

type ConfigStruct struct {
    Expiration string     `json:"expiration"`
    Conditions [][]string `json:"conditions"`
}
type PolicyToken struct {
    AccessKeyId string `json:"ossAccessKeyId"`
    Host        string `json:"host"`
    Signature   string `json:"signature"`
    Policy      string `json:"policy"`
    Directory   string `json:"dir"`
}

func getGMTISO8601(expireEnd int64) string {
    return time.Unix(expireEnd, 0).UTC().Format("2006-01-02T15:04:05Z")
}
func getPolicyToken() string {
    now := time.Now().Unix()
    expireEnd := now + expireTime
    tokenExpire := getGMTISO8601(expireEnd)
    var config ConfigStruct
    config.Expiration = tokenExpire
    var condition []string
    condition = append(condition, "starts-with")
    condition = append(condition, "$key")
    condition = append(condition, uploadDir)
    config.Conditions = append(config.Conditions, condition)
    result, err := json.Marshal(config)
    if err != nil {
    fmt.Println("callback json err:", err)
    return ""
    }
    encodedResult := base64.StdEncoding.EncodeToString(result)
    h := hmac.New(sha1.New, []byte(accessKeySecret))
    io.WriteString(h, encodedResult)
    signedStr := base64.StdEncoding.EncodeToString(h.Sum(nil))
    policyToken := PolicyToken{
    AccessKeyId: accessKeyId,
    Host:        host,
    Signature:   signedStr,
    Policy:      encodedResult,
    Directory:   uploadDir,
    }
    response, err := json.Marshal(policyToken)
    if err != nil {
    fmt.Println("json err:", err)
    return ""
    }
    return string(response)
}
func handler(w http.ResponseWriter, r *http.Request) {
    if r.URL.Path == "/" {
    http.ServeFile(w, r, "templates/index.html")
    return
    } else if r.URL.Path == "/get_post_signature_for_oss_upload" {
    policyToken := getPolicyToken()
    w.Header().Set("Content-Type", "application/json")
    w.Write([]byte(policyToken))
    return
    }
    http.NotFound(w, r)
}
func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

<?php
function gmt_iso8601($time)
{
    return str_replace('+00:00', '.000Z', gmdate('c', $time));
}

// Obtain access credentials from environment variables. Before you run the sample code, make sure that the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variables are configured. 
$accessKeyId = getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
$accessKeySecret = getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
// Specify a value for the $host parameter. The host is in the <YOUR-BUCKET>.<YOUR-ENDPOINT> format. 
$host = 'http://<YOUR-BUCKET>.<YOUR-ENDPOINT>';
// Specify the prefix in the name of the object you want to upload. 
$dir = 'user-dir-prefix/';          

$now = time();
// Specify the expiration time of the policy. If the expiration time elapses, the access is denied. In this example, the expiration time is set to 10 seconds. 
$expire = 30;  
$end = $now + $expire;
$expiration = gmt_iso8601($end);

// Specify the maximum size of the object that can be uploaded. 
$condition = array(0 => 'content-length-range', 1 => 0, 2 => 1048576000);
$conditions[] = $condition;

// Specify the object that can be uploaded. In this example, only an object whose name starts with the value of the $dir parameter can be uploaded. This is an optional setting that prevents an upload to a different directory in the bucket by using the policy. 
$start = array(0 => 'starts-with', 1 => '$key', 2 => $dir);
$conditions[] = $start;


$arr = array('expiration' => $expiration, 'conditions' => $conditions);
$policy = json_encode($arr);
$base64_policy = base64_encode($policy);
$string_to_sign = $base64_policy;
$signature = base64_encode(hash_hmac('sha1', $string_to_sign, $accessKeySecret, true));

$response = array();
$response['ossAccessKeyId'] = $accessKeyId;
$response['host'] = $host;
$response['policy'] = $base64_policy;
$response['signature'] = $signature;
$response['dir'] = $dir;  
echo json_encode($response);

const express = require("express");
const { Buffer } = require("buffer");
const OSS = require("ali-oss");
const app = express();
const path = require("path");
const config = {
  // Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
  accessKeyId: process.env.ALIBABA_CLOUD_ACCESS_KEY_ID,
  // Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable. 
  accessKeySecret: process.env.ALIBABA_CLOUD_ACCESS_KEY_SECRET,
  // Replace <YOUR-BUCKET> with the name of the bucket. 
  bucket: "<YOUR-BUCKET>",
  // Specify the prefix in the name of the object that you want to upload to OSS. 
  dir: "prefix/",
};

app.use(express.static(path.join(__dirname, "templates")));

app.get("/get_post_signature_for_oss_upload", async (req, res) => {
  const client = new OSS(config);
  const date = new Date();
  // Specify the validity period of the signature. Unit: seconds. 
  date.setSeconds(date.getSeconds() + 3600);
  const policy = {
    expiration: date.toISOString(),
    conditions: [
      // Specify the size limit on the object that can be uploaded. 
      ["content-length-range", 0, 1048576000],
      // Specify the bucket to which the object can be uploaded. 
      { bucket: client.options.bucket },
    ],
  };
  const formData = await client.calculatePostSignature(policy);
  const host = `http://${config.bucket}.${
    (await client.getBucketLocation()).location
  }.aliyuncs.com`.toString();
  const params = {
    policy: formData.policy,
    signature: formData.Signature,
    ossAccessKeyId: formData.OSSAccessKeyId,
    host,
    dir: config.dir,
  };
  res.json(params);
});

app.get(/^(.+)*\.(html|js)$/i, async (req, res) => {
  res.sendFile(path.join(__dirname, "./templates", req.originalUrl));
});

app.listen(8000, () => {
  console.log("http://127.0.0.1:8000");
});

require 'sinatra'
require 'base64'
require 'open-uri'
require 'cgi'
require 'openssl'
require 'json'
require 'sinatra/reloader'
require 'sinatra/content_for'

# Specify the path of the public-folder folder to the templates subfolder within the current folder.
set :public_folder, File.dirname(__FILE__) + '/templates'

# Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
$access_key_id = ENV['ALIBABA_CLOUD_ACCESS_ID']
# Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable. 
$access_key_secret = ENV['ALIBABA_CLOUD_ACCESS_SECRET']

# Specify the host. The host is in the <bucketname>.<endpoint> format. 
$host = 'http://<bucketname>.<endpoint>';

# Specify the prefix in the name of the object you want to upload. 
$upload_dir = 'user-dir-prefix/'
# Specify the validity period. Unit: seconds. 
$expire_time = 30
$server_ip = "0.0.0.0"
$server_port = 8000

if ARGV.length == 1 
  $server_port = ARGV[0]
elsif ARGV.length == 2
  $server_ip = ARGV[0]
  $server_port = ARGV[1]
end

puts "App server is running on: http://#{$server_ip}:#{$server_port}"

def hash_to_jason(source_hash)
  jason_string = source_hash.to_json;    

  jason_string.gsub!("\":[", "\": [")
  jason_string.gsub!("\",\"", "\", \"")
  jason_string.gsub!("],\"", "], \"")
  jason_string.gsub!("\":\"", "\": \"")

  jason_string
end


def get_token()
  expire_syncpoint = Time.now.to_i + $expire_time
  expire = Time.at(expire_syncpoint).utc.iso8601()
  response.headers['expire'] = expire
  policy_dict = {}
  condition_arrary = Array.new
  array_item = Array.new
  array_item.push('starts-with')
  array_item.push('$key')
  array_item.push($upload_dir)
  condition_arrary.push(array_item)
  policy_dict["conditions"] = condition_arrary
  policy_dict["expiration"] = expire
  policy = hash_to_jason(policy_dict)
  policy_encode = Base64.strict_encode64(policy).chomp;
  h = OpenSSL::HMAC.digest('sha1', $access_key_secret, policy_encode)
  hs = Digest::MD5.hexdigest(h)
  sign_result = Base64.strict_encode64(h).strip()
  token_dict = {}
  token_dict['ossAccessKeyId'] = $access_key_id
  token_dict['host'] = $host
  token_dict['policy'] = policy_encode
  token_dict['signature'] = sign_result 
  token_dict['expire'] = expire_syncpoint
  token_dict['dir'] = $upload_dir
  result = hash_to_jason(token_dict)
  result
end

set :bind, $server_ip
set :port, $server_port

get '/get_post_signature_for_oss_upload' do
  token = get_token()
  puts "Token: #{token}"
  token
end

get '/*' do
  puts "********************* GET "
  send_file File.join(settings.public_folder, 'index.html')
end

end

if ARGV.length == 1 
  $server_port = ARGV[0]
elsif ARGV.length == 2
  $server_ip = ARGV[0]
  $server_port = ARGV[1]
end

$server_ip = "0.0.0.0"
$server_port = 8000

puts "App server is running on: http://#{$server_ip}:#{$server_port}"

set :bind, $server_ip
set :port, $server_port

get '/get_sts_token_for_oss_upload' do
  token = get_sts_token_for_oss_upload()
  response = {
    "AccessKeyId" => token["Credentials"]["AccessKeyId"],
    "AccessKeySecret" => token["Credentials"]["AccessKeySecret"],
    "SecurityToken" => token["Credentials"]["SecurityToken"]
  }
  response.to_json
end

get '/*' do
  puts "********************* GET "
  send_file File.join(settings.public_folder, 'index.html')
end

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Http;
using System.IO;
using System.Collections.Generic;
using System;
using System.Globalization;
using System.Text;
using System.Security.Cryptography;
using Newtonsoft.Json;
using Microsoft.AspNetCore.Http.Extensions;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace YourNamespace
{
    public class Program
    {
        private ILogger<Program> _logger;
        // Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
        public string AccessKeyId { get; set; } = Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_ID");
        // Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable. 
        public string AccessKeySecret { get; set; } = Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
        // Specify the host. The host is in the BucketName.Endpoint format. Replace <YOUR-BUCKET> with the name of the bucket. Replace <YOUR-ENDPOINT> with the endpoint of the region in which the bucket is located, such as oss-cn-hangzhou.aliyuncs.com. 
        public string Host { get; set; } = "<YOUR-BUCKET>.<YOUR-ENDPOINT>";
        // Specify the prefix in the name of the object that you want to upload to OSS. 
        public string UploadDir { get; set; } = "user-dir-prefix/";
        // Specify the expiration time. Unit: seconds. 
        public int ExpireTime { get; set; } = 3600;
        public class PolicyConfig
        {
            public string expiration { get; set; }
            public List<List<object>> conditions { get; set; }
        }
        public class PolicyToken
        {
            public string Accessid { get; set; }
            public string Policy { get; set; }
            public string Signature { get; set; }
            public string Dir { get; set; }
            public string Host { get; set; }
            public string Expire { get; set; }
        }
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);
            var app = builder.Build();

            builder.Logging.AddConsole();
            var logger = builder.Services.BuildServiceProvider().GetRequiredService<ILogger<Program>>();

            app.UseStaticFiles(); 

            app.MapGet("/", async (context) =>
            {
                var filePath = Path.Combine(Directory.GetCurrentDirectory(), "templates/index.html");
                var htmlContent = await File.ReadAllTextAsync(filePath);
                await context.Response.WriteAsync(htmlContent);
                logger.LogInformation("GET request to root path");
            });

            app.MapGet("/get_post_signature_for_oss_upload", async (context) =>
            {
                var program = new Program(logger);
                var token = program.GetPolicyToken();

                logger.LogInformation($"Token: {token}");

                context.Response.ContentType = "application/json";
                await context.Response.WriteAsync(token);
            });

            app.Run();
        }

        public Program(ILogger<Program> logger)
        {
            _logger = logger;
        }

        private string ToUnixTime(DateTime dateTime)
        {
            return ((DateTimeOffset)dateTime).ToUnixTimeSeconds().ToString();
        }

        private string GetPolicyToken()
        {
            var expireDateTime = DateTime.Now.AddSeconds(ExpireTime);
            var config = new PolicyConfig
            {
                expiration = FormatIso8601Date(expireDateTime),
                conditions = new List<List<object>>()
            };
            config.conditions.Add(new List<object>
            {
                "content-length-range", 0, 1048576000
            });
            var policy = JsonConvert.SerializeObject(config);
            var policyBase64 = EncodeBase64("utf-8", policy);
            var signature = ComputeSignature(AccessKeySecret, policyBase64);
            var policyToken = new PolicyToken
            {
                Accessid = AccessKeyId,
                Host = Host,
                Policy = policyBase64,
                Signature = signature,
                Expire = ToUnixTime(expireDateTime),
                Dir = UploadDir
            };
            return JsonConvert.SerializeObject(policyToken);
        }

        private string FormatIso8601Date(DateTime dtime)
        {
            return dtime.ToUniversalTime().ToString("yyyy-MM-dd'T'HH:mm:ss.fff'Z'",
                                    CultureInfo.CurrentCulture);
        }

        private string EncodeBase64(string codeType, string code)
        {
            string encode = "";
            byte[] bytes = Encoding.GetEncoding(codeType).GetBytes(code);
            try
            {
                encode = Convert.ToBase64String(bytes);
            }
            catch
            {
                encode = code;
            }
            return encode;
        }

        private string ComputeSignature(string key, string data)
        {
            using (var algorithm = new HMACSHA1(Encoding.UTF8.GetBytes(key)))
            {
                return Convert.ToBase64String(algorithm.ComputeHash(Encoding.UTF8.GetBytes(data)));
            }
        }
    }
}

const form = document.querySelector('form');
const fileInput = document.querySelector('#file');
form.addEventListener('submit', (event) => {
  event.preventDefault();
  let file = fileInput.files[0];
  let filename = fileInput.files[0].name;
  fetch('/get_post_signature_for_oss_upload', { method: 'GET' })
    .then(response => response.json())
    .then(data => {
      const formData = new FormData();
      formData.append('name',filename);
      formData.append('policy', data.policy);
      formData.append('OSSAccessKeyId', data.ossAccessKeyId);
      formData.append('success_action_status', '200');
      formData.append('signature', data.signature);
      formData.append('key', data.dir + filename);
      // file must be the last form field. No particular order is required for other form fields. 
      formData.append('file', file);
      fetch(data.host, { method: 'POST', body: formData },).then((res) => {
        console.log(res);
        alert ('Object Uploaded');
      });
    })
    .catch(error => {
      console.log('Error occurred while getting OSS upload parameters:', error);
    });
});

import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider

# Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
auth = oss2.ProviderAuth(EnvironmentVariableCredentialsProvider())
# Replace <YOUR_ENDPOINT> with the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
# Replace <YOUR_BUCKET> with the name of the bucket. 
bucket = oss2.Bucket(auth, '<YOUR_ENDPOINT>', '<YOUR_BUCKET>')
# Specify the validity period. Unit: seconds. 
expire_time = 3600
# Specify the full path of the object. Example: exampledir/exampleobject.png. Do not include the bucket name in the full path. 
object_name = 'exampledir/exampleobject.png'

def generate_presigned_url():
    # Specify headers. 
    headers = dict()
    # Specify the Content-Type header. 
    headers['Content-Type'] = 'image/png'
    # Specify the storage class. 
    # headers["x-oss-storage-class"] = "Standard"
    # By default, OSS identifies the forward slashes (/) in the full path of an object as escape characters when a signed URL is generated. Therefore, you cannot use the signed URL directly. 
    # Set the slash_safe parameter to True. This way, OSS does not identify the forward slashes (/) in the full path of the object as escape characters. In this case, you can use the generated signed URL. 
    url = bucket.sign_url('PUT', object_name, expire_time, slash_safe=True, headers=headers)
    return url

import com.aliyun.oss.HttpMethod;
import com.aliyun.oss.OSS;
import com.aliyun.oss.model.GeneratePresignedUrlRequest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.aliyun.oss.OSSClientBuilder;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Bean;

import javax.annotation.PreDestroy;
import java.net.URL;
import java.util.Date;

/**
 * Applicationx
 *
 * @author peiyu
 * @date 2023/10/24
 */
@Controller
public class PresignedURLController {

    /**
     * Replace <YOUR-BUCKET> with the name of the bucket. 
     * Specify the prefix in the name of the object that you want to upload to OSS. 
     * Replace <YOUR-OBJECT> with the full path of the object. Example: exampleobject.txt. Do not include the bucket name in the full path. 
     * Specify the expiration time. Unit: milliseconds. 
     */
    private static final String BUCKET_NAME = "<YOUR-BUCKET>";
    private static final String OBJECT_NAME = "<YOUR-OBJECT>";
    private static final long EXPIRE_TIME = 3600 * 1000L;

    @Autowired
    private OSS ossClient;

    @GetMapping("/get_presigned_url_for_oss_upload")
    @ResponseBody
    public String generatePresignedURL() {

        try {
            GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(BUCKET_NAME, OBJECT_NAME, HttpMethod.PUT);
            Date expiration = new Date(System.currentTimeMillis() + EXPIRE_TIME);
            request.setExpiration(expiration);
            request.setContentType("image/png");
            URL signedUrl = ossClient.generatePresignedUrl(request);
            return signedUrl.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

@Configuration
public class OssConfig {

    /**
     * Specify the endpoint of the region in which the bucket is located. Example: oss-cn-hangzhou.aliyuncs.com. 
     */
    private static final String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";

    /**
     * Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable.
     */
    @Value("${ALIBABA_CLOUD_ACCESS_KEY_ID}")
    private String accessKeyId;

    /**
     * Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable.
     */
    @Value("${ALIBABA_CLOUD_ACCESS_KEY_SECRET}")
    private String accessKeySecret;

    private OSS ossClient;


    @Bean
    public OSS getSssClient() {
        ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        return ossClient;
    }

    @PreDestroy
    public void onDestroy() {
        ossClient.shutdown();
    }
}

package main

import (
	"fmt"
	"net/http"
	"os"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func getURL() string {
	// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
	endpoint := "https://oss-cn-beijing.aliyuncs.com"
	// Specify the name of the bucket. Example: examplebucket. 
	bucketName := "examplebucket"
	// Specify the full path of the object. Example: exampledir/exampleobject.txt. Do not include the bucket name in the full path of the object. 
	objectName := "exampledir/exampleobject.txt"
	// Obtain access credentials from environment variables. Before you run the sample code, make sure that the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variables are configured. 
	accessKeyID := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_ID")
	accessKeySecret := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")

	client, err := oss.New(endpoint, accessKeyID, accessKeySecret)
	if err != nil {
		fmt.Println("json err:", err)
	}
	bucket, err := client.Bucket(bucketName)
	if err != nil {
		fmt.Println("json err:", err)
	}
	options := []oss.Option{
		oss.ContentType("image/png"),
	}
	signedURL, err := bucket.SignURL(objectName, oss.HTTPPut, 60, options...)
	if err != nil {
		fmt.Println("json err:", err)
	}

	return signedURL
}

func handler(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path == "/" {
		http.ServeFile(w, r, "templates/index.html")
		return
	} else if r.URL.Path == "/get_presigned_url_for_oss_upload" {
		url := getURL()
		fmt.Fprintf(w, "%s", url)
		return
	}
	http.NotFound(w, r)
}
func main() {
	http.HandleFunc("/", handler)
	http.ListenAndServe(":8080", nil)
}

<?php
require_once __DIR__ . '/vendor/autoload.php';
use OSS\OssClient;
use OSS\Core\OssException;
use OSS\Http\RequestCore;
use OSS\Http\ResponseCore;
// Before you run the sample code, make sure that the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variables are configured. 
$accessKeyId = getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
$accessKeySecret = getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
$endpoint = "<YOUR-ENDPOINT>";
// Specify the name of the bucket. 
$bucket= "<YOUR-BUCKET>";
// Specify the full path of the object. Do not include the bucket name in the full path. 
$object = "test.png";
// Set the validity period of the signed URL to 3600. Unit: seconds. 
$timeout = 3600;
try {
    $ossClient = new OssClient($accessKeyId, $accessKeySecret, $endpoint, false);
    // Generate the signed URL. 
    $signedUrl = $ossClient->signUrl($bucket, $object, $timeout, "PUT", array('Content-Type' => 'image/png'));
    // Print the returned data.
    echo $signedUrl;
} catch (OssException $e) {
    printf($e->getMessage() . "\n");
    return;
}

const express = require("express");
const { Buffer } = require("buffer");
const OSS = require("ali-oss");
const app = express();
const path = require("path");
const fs = require("fs");
const axios = require("axios");

const config = {
  // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to oss-cn-hangzhou. 
  region: '<YOURREGION>',
  // Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
  accessKeyId: process.env.ALIBABA_CLOUD_ACCESS_KEY_ID,
  // Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable. 
  accessKeySecret: process.env.ALIBABA_CLOUD_ACCESS_KEY_SECRET,
  // Replace <YOUR-BUCKET> with the name of the bucket. 
  bucket: "<YOUR-BUCKET>",
}
const object = "examplefile.png";

app.use(express.static(path.join(__dirname, "templates")));

app.get("/get_presigned_url_for_oss_upload", async (req, res) => {
    const client = new OSS(config);
    const url = client.signatureUrl(object, {
        method: "PUT",
        "Content-Type": "application/x-www-form-urlencoded",
    });
    res.send(url); 
    console.log(url);
  });

app.listen(8000, () => {
  console.log("http://127.0.0.1:8000");
});

require 'sinatra'
require 'base64'
require 'open-uri'
require 'cgi'
require 'openssl'
require 'json'
require 'sinatra/reloader'
require 'sinatra/content_for'
require 'aliyun/oss'
include Aliyun::OSS

# Specify the path of the public-folder folder to the templates subfolder within the current folder.
set :public_folder, File.dirname(__FILE__) + '/templates'

# Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
$access_key_id = ENV['ALIBABA_CLOUD_ACCESS_KEY_ID']
# Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_SECRET environment variable. 
$access_key_secret = ENV['ALIBABA_CLOUD_ACCESS_KEY_SECRET']

# Specify the full path of the object. Example: exampledir/exampleobject.png. Do not include the bucket name in the full path. 
object_key = 'exampledir/exampleobject.png'

def get_presigned_url(client, object_key)
  # Replace <YOUR-BUCKET> with the name of the bucket. 
  bucket = client.get_bucket('<YOUR-BUCKET>')
  # Generate a signed URL and set the validity period of the URL to 3600. Unit: seconds. 
  bucket.object_url(object_key, 3600)
end

client = Aliyun::OSS::Client.new(
  # Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
  endpoint: '<YOUR-ENDPOINT>',
  # Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
  access_key_id: $access_key_id,
  access_key_secret: $access_key_secret
)


if ARGV.length == 1 
  $server_port = ARGV[0]
elsif ARGV.length == 2
  $server_ip = ARGV[0]
  $server_port = ARGV[1]
end

$server_ip = "0.0.0.0"
$server_port = 8000

puts "App server is running on: http://#{$server_ip}:#{$server_port}"

set :bind, $server_ip
set :port, $server_port

get '/get_presigned_url_for_oss_upload' do
  url = get_presigned_url(client, object_key.to_s)
  puts "Token: #{url}"
  url
end

get '/*' do
  puts "********************* GET "
  send_file File.join(settings.public_folder, 'index.html')
end

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Http;
using System.IO;
using System;
using Microsoft.Extensions.Logging;
using Aliyun.OSS;

namespace YourNamespace
{
    public class Program
    {
        private ILogger<Program> _logger;

        // Obtain the AccessKey ID from the ALIBABA_CLOUD_ACCESS_KEY_ID environment variable. 
        public string AccessKeyId { get; set; } = Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_ID");
        // Obtain the AccessKey secret from the ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variable. 
        public string AccessKeySecret { get; set; } = Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
        // Replace <YOUR-ENDPOINT> with the endpoint of the region where the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
        private string EndPoint { get; set; } = "<YOUR-ENDPOINT>";
        // Replace <YOUR-BUCKET> with the name of the bucket. 
        private string BucketName { get; set; } = "<YOUR-BUCKET>";
        private string ObjectName { get; set; } = "exampledir/exampleobject2.png";

        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);
            var app = builder.Build();

            // Specify logging.
            builder.Logging.AddConsole();
            var logger = builder.Services.BuildServiceProvider().GetRequiredService<ILogger<Program>>();

            app.UseStaticFiles(); // Add this line to enable static file middleware

            app.MapGet("/", async (context) =>
            {
                var filePath = Path.Combine(Directory.GetCurrentDirectory(), "templates/index.html");
                var htmlContent = await File.ReadAllTextAsync(filePath);
                await context.Response.WriteAsync(htmlContent);

                // Print logs.
                logger.LogInformation("GET request to root path");
            });

            app.MapGet("/get_presigned_url_for_oss_upload", async (context) =>
            {
                var program = new Program(logger);
                var signedUrl = program.GetSignedUrl();

                logger.LogInformation($"SignedUrl: {signedUrl}"); // Print the value of the token.
                await context.Response.WriteAsync(signedUrl);
            });

            app.Run();
        }

        // Inject the ILogger.
        public Program(ILogger<Program> logger)
        {
            _logger = logger;
        }

        private string GetSignedUrl()
        {
            // Create an OSSClient instance.
            var ossClient = new OssClient(EndPoint, AccessKeyId, AccessKeySecret);

            // Create a request to generate the signed URL.
            var generatePresignedUriRequest = new GeneratePresignedUriRequest(BucketName, ObjectName, SignHttpMethod.Put)
            {
                Expiration = DateTime.Now.AddHours(1),
                ContentType = "image/png"
            };
            var signedUrl = ossClient.GeneratePresignedUri(generatePresignedUriRequest);

            return signedUrl.ToString();
        }
    }
}

const form = document.querySelector("form");
form.addEventListener("submit", (event) => {
  event.preventDefault();
  const fileInput = document.querySelector("#file");
  const file = fileInput.files[0];
  fetch(`/get_presigned_url_for_oss_upload?filename=${file.name}`, { method: "GET" })
    .then((response) => {
        return response.text();
     })
    .then((url) => {
      fetch(url, {
        method: "PUT",
        headers: new Headers({
          'Content-Type': 'image/png',
        }),
        body: file,
       }).then((res) => {
            console.log(res);
            alert ('Object Uploaded');
       });
   });
});