Object Storage Service:Fazer upload de um objeto usando uma URL pré-assinada (Java SDK V1)

1. O proprietário do objeto gera uma URL pré-assinada para uma requisição PUT que inclui cabeçalhos de requisição especificados e metadados personalizados.

   import com.aliyun.oss.*;
   import com.aliyun.oss.common.auth.*;
   import com.aliyun.oss.common.comm.SignVersion;
   import com.aliyun.oss.internal.OSSHeaders;
   import com.aliyun.oss.model.GeneratePresignedUrlRequest;
   import com.aliyun.oss.model.StorageClass;
   
   import java.net.URL;
   import java.util.*;
   import java.util.Date;
   
   public class GetSignUrl {
       public static void main(String[] args) throws Throwable {
           // This example uses the public endpoint of the China (Hangzhou) region. Specify the actual endpoint.
           String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
           // 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.
           EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
           // Specify the bucket name, for example, examplebucket.
           String bucketName = "examplebucket";
           // Specify the full path of the object, for example, exampleobject.txt. The full path of the object cannot contain the bucket name.
           String objectName = "exampleobject.txt";
           // Specify the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the region to cn-hangzhou.
           String region = "cn-hangzhou";
   
           // Create an OSSClient instance.
           // When the OSSClient instance is no longer in use, call the shutdown method to release resources.
           ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
           clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
           OSS ossClient = OSSClientBuilder.create()
                   .endpoint(endpoint)
                   .credentialsProvider(credentialsProvider)
                   .clientConfiguration(clientBuilderConfiguration)
                   .region(region)
                   .build();
   
           // Set the request headers.
           Map<String, String> headers = new HashMap<String, String>();
           // Specify the StorageClass.
           headers.put(OSSHeaders.STORAGE_CLASS, StorageClass.Standard.toString());
           // Specify the ContentType.
           headers.put(OSSHeaders.CONTENT_TYPE, "text/plain; charset=utf8");
   
           // Set the custom user metadata.
           Map<String, String> userMetadata = new HashMap<String, String>();
           userMetadata.put("key1","value1");
           userMetadata.put("key2","value2");
   
           URL signedUrl = null;
           try {
               // Specify the expiration time of the generated presigned URL in milliseconds. This example sets the expiration time to 1 hour.
               Date expiration = new Date(new Date().getTime() + 3600 * 1000L);
   
               // Generate a presigned URL.
               GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucketName, objectName, HttpMethod.PUT);
               // Set the expiration time.
               request.setExpiration(expiration);
   
               // Add the request headers to the request.
               request.setHeaders(headers);
               // Add the custom user metadata.
               request.setUserMetadata(userMetadata);
   
               // Generate a presigned URL for an HTTP PUT request.
               signedUrl = ossClient.generatePresignedUrl(request);
               // Print the presigned URL.
               System.out.println("signed url for putObject: " + signedUrl);
   
           } 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 (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());
           }
       }
   }       

2. Outro usuário faz upload de um arquivo usando a URL pré-assinada para a requisição PUT.

   curl

   curl -X PUT \
        -H "Content-Type: text/plain;charset=utf8" \
        -H "x-oss-storage-class: Standard" \
        -H "x-oss-meta-key1: value1" \
        -H "x-oss-meta-key2: value2" \
        -T "C:\\Users\\demo.txt" \
        "https://exampleobject.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T083238Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI****************%2F20241112%2Fcn-hangzhou%2Foss%2Faliyun_v4_request&x-oss-signature=ed5a******************************************************"

   Java

   package com.aliyun.sample;
   
   import com.aliyun.oss.internal.OSSHeaders;
   import com.aliyun.oss.model.StorageClass;
   import org.apache.http.HttpEntity;
   import org.apache.http.client.methods.CloseableHttpResponse;
   import org.apache.http.client.methods.HttpPut;
   import org.apache.http.entity.FileEntity;
   import org.apache.http.impl.client.CloseableHttpClient;
   import org.apache.http.impl.client.HttpClients;
   import java.io.*;
   import java.net.URL;
   import java.util.*;
   
   public class SignUrlUpload {
       public static void main(String[] args) throws Throwable {
           CloseableHttpClient httpClient = null;
           CloseableHttpResponse response = null;
   
           // Replace <signedUrl> with the authorized URL.
           URL signedUrl = new URL("<signedUrl>");
   
           // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
           String pathName = "C:\\Users\\demo.txt";
   
           // Set the request headers. The request header information must be the same as the information used when the URL was generated.
           Map<String, String> headers = new HashMap<String, String>();
           //Specify the storage class of the object.
           headers.put(OSSHeaders.STORAGE_CLASS, StorageClass.Standard.toString());
           //Specify the ContentType.
           headers.put(OSSHeaders.CONTENT_TYPE, "text/plain;charset=utf8");
   
           // Set the custom user metadata. The custom user metadata must be the same as the information used when the URL was generated.
           Map<String, String> userMetadata = new HashMap<String, String>();
           userMetadata.put("key1","value1");
           userMetadata.put("key2","value2");
   
           try {
               HttpPut put = new HttpPut(signedUrl.toString());
               System.out.println(put);
               HttpEntity entity = new FileEntity(new File(pathName));
               put.setEntity(entity);
               // If you set header parameters, such as user metadata and storage class, when you generate the presigned URL, you must also send these parameters to the server when you use the presigned URL to upload the file. A signature error is reported if the parameters sent to the server are inconsistent with the signed parameters.
               for(Map.Entry<String, String> header: headers.entrySet()){
                   put.addHeader(header.getKey(), header.getValue());
               }
               for(Map.Entry<String, String> meta: userMetadata.entrySet()){
                   // If you use userMeta, the SDK internally adds the 'x-oss-meta-' prefix. When you use other methods to generate a presigned URL for an upload, you must also add the 'x-oss-meta-' prefix to the userMeta.
                   put.addHeader("x-oss-meta-"+meta.getKey(), meta.getValue());
               }
   
               httpClient = HttpClients.createDefault();
   
               response = httpClient.execute(put);
   
               System.out.println("Status code returned for the upload:"+response.getStatusLine().getStatusCode());
               if(response.getStatusLine().getStatusCode() == 200){
                   System.out.println("Upload successful using network library.");
               }
               System.out.println(response.toString());
           } catch (Exception e){
               e.printStackTrace();
           } finally {
               if (response != null) {
                   response.close();
               }
               if (httpClient != null) {
                   httpClient.close();
               }
           }
       }
   }

   Go

   package main
   
   import (
   	"bytes"
   	"fmt"
   	"io/ioutil"
   	"net/http"
   	"os"
   )
   
   func uploadFile(signedUrl string, filePath string, headers map[string]string, metadata map[string]string) error {
   	// Open the file.
   	file, err := os.Open(filePath)
   	if err != nil {
   		return err
   	}
   	defer file.Close()
   
   	// Read the file content.
   	fileBytes, err := ioutil.ReadAll(file)
   	if err != nil {
   		return err
   	}
   
   	// Create a request.
   	req, err := http.NewRequest("PUT", signedUrl, bytes.NewBuffer(fileBytes))
   	if err != nil {
   		return err
   	}
   
   	// Set the request headers.
   	for key, value := range headers {
   		req.Header.Set(key, value)
   	}
   
   	// Set the custom user metadata.
   	for key, value := range metadata {
   		req.Header.Set(fmt.Sprintf("x-oss-meta-%s", key), value)
   	}
   
   	// Send the request.
   	client := &http.Client{}
   	resp, err := client.Do(req)
   	if err != nil {
   		return err
   	}
   	defer resp.Body.Close()
   
   	// Process the response.
   	fmt.Printf("Status code returned for the upload: %d\n", resp.StatusCode)
   	if resp.StatusCode == 200 {
   		fmt.Println("Upload successful using network library.")
   	} else {
   		fmt.Println("Upload failed.")
   	}
   	body, _ := ioutil.ReadAll(resp.Body)
   	fmt.Println(string(body))
   
   	return nil
   }
   
   func main() {
   	// Replace <signedUrl> with the authorized URL.
   	signedUrl := "<signedUrl>"
   
   	// Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
   	filePath := "C:\\Users\\demo.txt"
   
   	// Set the request headers. The request header information must be the same as the information used when the URL was generated.
   	headers := map[string]string{
   		"Content-Type": "text/plain;charset=utf8",
   		"x-oss-storage-class": "Standard",
   	}
   
   	// Set the custom user metadata. The custom user metadata must be the same as the information used when the URL was generated.
   	metadata := map[string]string{
   		"key1": "value1",
   		"key2": "value2",
   	}
   
   	err := uploadFile(signedUrl, filePath, headers, metadata)
   	if err != nil {
   		fmt.Printf("An error occurred: %v\n", err)
   	}
   }
   

   Python

   import requests
   from requests.auth import HTTPBasicAuth
   import os
   
   def upload_file(signed_url, file_path, headers=None, metadata=None):
       """
       Use a presigned URL to upload a file to OSS.
   
       :param signed_url: The presigned URL.
       :param file_path: The full path of the file to upload.
       :param headers: Optional. Custom HTTP headers.
       :param metadata: Optional. Custom metadata.
       :return: None
       """
       if not headers:
           headers = {}
       if not metadata:
           metadata = {}
   
       # Update headers and add the metadata prefix.
       for key, value in metadata.items():
           headers[f'x-oss-meta-{key}'] = value
   
       try:
           with open(file_path, 'rb') as file:
               response = requests.put(signed_url, data=file, headers=headers)
               print(f"Status code returned for the upload: {response.status_code}")
               if response.status_code == 200:
                   print("Upload successful using network library.")
               else:
                   print("Upload failed.")
               print(response.text)
       except Exception as e:
           print(f"An error occurred: {e}")
   
   if __name__ == "__main__":
       # Replace <signedUrl> with the authorized URL.
       signed_url = "<signedUrl>"
      
       # Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the directory where the script is located by default.
       file_path = "C:\\Users\\demo.txt"
   
       # Set the request headers. The request header information must be the same as the information used when the URL was generated.
       headers = {
            "Content-Type": "text/plain;charset=utf8",
            "x-oss-storage-class": "Standard"
       }
   
       # Set the custom user metadata. The custom user metadata must be the same as the information used when the URL was generated.
       metadata = {
            "key1": "value1",
            "key2": "value2"
       }
   
       upload_file(signed_url, file_path, headers, metadata)
   

   Node.js

   const fs = require('fs');
   const axios = require('axios');
   
   async function uploadFile(signedUrl, filePath, headers = {}, metadata = {}) {
       try {
           // Update headers and add the metadata prefix.
           for (const [key, value] of Object.entries(metadata)) {
               headers[`x-oss-meta-${key}`] = value;
           }
   
           // Read the file stream.
           const fileStream = fs.createReadStream(filePath);
   
           // Send a PUT request.
           const response = await axios.put(signedUrl, fileStream, {
               headers: headers
           });
   
           console.log(`Status code returned for the upload: ${response.status}`);
           if (response.status === 200) {
               console.log("Upload successful using network library.");
           } else {
               console.log("Upload failed.");
           }
           console.log(response.data);
       } catch (error) {
           console.error(`An error occurred: ${error.message}`);
       }
   }
   
   // Main function.
   (async () => {
       // Replace <signedUrl> with the authorized URL.
       const signedUrl = "<signedUrl>";
   
       // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the directory where the script is located by default.
       const filePath = "C:\\Users\\demo.txt";
   
       // Set the request headers. The request header information must be the same as the information used when the URL was generated.
       const headers = {
            "Content-Type": "text/plain;charset=utf8",
            "x-oss-storage-class": "Standard"
       };
   
       // Set the custom user metadata. The custom user metadata must be the same as the information used when the URL was generated.
       const metadata = {
            "key1": "value1",
            "key2": "value2"
       };
   
       await uploadFile(signedUrl, filePath, headers, metadata);
   })();
   

   Browser.js

   Importante

   Se você encontrar um erro 403 de incompatibilidade de assinatura ao usar o Browser.js para fazer upload de um arquivo, isso geralmente ocorre porque o navegador adiciona automaticamente o cabeçalho de requisição Content-Type, e esse cabeçalho não foi incluído quando a URL pré-assinada foi gerada. Essa incompatibilidade causa uma falha na verificação de assinatura. Para resolver esse problema, especifique o cabeçalho de requisição Content-Type ao gerar a URL pré-assinada.

   <!DOCTYPE html>
   <html lang="en">
   <head>
       <meta charset="UTF-8">
       <meta name="viewport" content="width=device-width, initial-scale=1.0">
       <title>File Upload Example</title>
   </head>
   <body>
       <h1>File Upload Example (Java SDK)</h1>
   
       <input type="file" id="fileInput" />
       <button id="uploadButton">Upload File</button>
   
       <script>
           // Replace this with the actual presigned URL.
           const signedUrl = "<signedUrl>"; 
   
           document.getElementById('uploadButton').addEventListener('click', async () => {
               const fileInput = document.getElementById('fileInput');
               const file = fileInput.files[0];
   
               if (file) {
                   try {
                       await upload(file, signedUrl);
                   } catch (error) {
                       console.error('Error during upload:', error);
                       alert('Upload failed: ' + error.message);
                   }
               } else {
                   alert('Please select a file to upload.');
               }
           });
   
           const upload = async (file, presignedUrl) => {
               const headers = {
                   "Content-Type": "text/plain;charset=utf8",
                   'x-oss-storage-class': 'Standard',
                   'x-oss-meta-key1': 'value1',
                   'x-oss-meta-key2': 'value2'
               };
   
               const response = await fetch(presignedUrl, {
                   method: 'PUT',
                   headers: headers,
                   body: file
               });
   
               if (!response.ok) {
                   throw new Error(`Upload failed, status: ${response.status}`);
               }
   
               alert('File uploaded successfully');
               console.log('File uploaded successfully');
           };
       </script>
   </body>
   </html>

   C#

   using System.Net.Http.Headers;
   
   // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
   var filePath = "C:\\Users\\demo.txt";
   // Replace <signedUrl> with the authorized URL.
   var presignedUrl = "<signedUrl>";
   
   // Create an HTTP client and open the local file stream.
   using var httpClient = new HttpClient(); 
   using var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
   using var content = new StreamContent(fileStream);
               
   // Create a PUT request.
   var request = new HttpRequestMessage(HttpMethod.Put, presignedUrl);
   request.Content = content;
   
   // If you set header parameters, such as user metadata and storage class, when you generate the presigned URL, you must also send these parameters to the server when you use the presigned URL to upload the file. A signature error is reported if the parameters sent to the server are inconsistent with the signed parameters.
   // Set the request headers. The request header information must be the same as the information used when the URL was generated.
   request.Content.Headers.ContentType = new MediaTypeHeaderValue("text/plain") { CharSet = "utf8" };  // Specify the ContentType.       
   // Set the custom user metadata. The custom user metadata must be the same as the information used when the URL was generated.
   request.Content.Headers.Add("x-oss-meta-key1", "value1");
   request.Content.Headers.Add("x-oss-meta-key2", "value2");
   // Specify the storage class of the object.
   request.Content.Headers.Add("x-oss-storage-class", "Standard");
   
   // Print the request headers.
   Console.WriteLine("Request headers:");
   foreach (var header in request.Content.Headers)
   {
       Console.WriteLine($"{header.Key}: {string.Join(", ", header.Value)}");
   }
   
   // Send the request.
   var response = await httpClient.SendAsync(request);
   
   // Process the response.
   if (response.IsSuccessStatusCode)
   {
       Console.WriteLine($"Upload successful! Status code: {response.StatusCode}");
       Console.WriteLine("Response headers:");
       foreach (var header in response.Headers)
       {
           Console.WriteLine($"{header.Key}: {string.Join(", ", header.Value)}");
       }
   }
   else
   {
       string responseContent = await response.Content.ReadAsStringAsync();
       Console.WriteLine($"Upload failed! Status code: {response.StatusCode}");
       Console.WriteLine("Response content: " + responseContent);
   }

   C++

   #include <iostream>
   #include <fstream>
   #include <curl/curl.h>
   #include <map>
   #include <string>
   
   // Callback function to handle the HTTP response.
   size_t WriteCallback(void* contents, size_t size, size_t nmemb, std::string* output) {
       size_t totalSize = size * nmemb;
       output->append((char*)contents, totalSize);
       return totalSize;
   }
   
   void uploadFile(const std::string& signedUrl, const std::string& filePath, const std::map<std::string, std::string>& headers, const std::map<std::string, std::string>& metadata) {
       CURL* curl;
       CURLcode res;
       std::string readBuffer;
   
       curl_global_init(CURL_GLOBAL_DEFAULT);
       curl = curl_easy_init();
   
       if (curl) {
           // Set the URL.
           curl_easy_setopt(curl, CURLOPT_URL, signedUrl.c_str());
   
           // Set the request method to PUT.
           curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
   
           // Open the file.
           FILE* file = fopen(filePath.c_str(), "rb");
           if (!file) {
               std::cerr << "Unable to open file: " << filePath << std::endl;
               return;
           }
   
           // Set the file size.
           fseek(file, 0, SEEK_END);
           long fileSize = ftell(file);
           rewind(file);
   
           // Set the file read callback.
           curl_easy_setopt(curl, CURLOPT_READDATA, file);
           curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)fileSize);
   
           // Set the request headers.
           struct curl_slist* chunk = nullptr;
           for (const auto& header : headers) {
               std::string headerStr = header.first + ": " + header.second;
               chunk = curl_slist_append(chunk, headerStr.c_str());
           }
           for (const auto& meta : metadata) {
               std::string metaStr = "x-oss-meta-" + meta.first + ": " + meta.second;
               chunk = curl_slist_append(chunk, metaStr.c_str());
           }
           curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
   
           // Set the response handling callback.
           curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
           curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
   
           // Execute the request.
           res = curl_easy_perform(curl);
   
           // Check the response.
           if (res != CURLE_OK) {
               std::cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << std::endl;
           } else {
               long responseCode;
               curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &responseCode);
               std::cout << "Status code returned for the upload: " << responseCode << std::endl;
               if (responseCode == 200) {
                   std::cout << "Upload successful using network library." << std::endl;
               } else {
                   std::cout << "Upload failed." << std::endl;
               }
               std::cout << readBuffer << std::endl;
           }
   
           // Clean up.
           fclose(file);
           curl_slist_free_all(chunk);
           curl_easy_cleanup(curl);
       }
   
       curl_global_cleanup();
   }
   
   int main() {
       // Replace <signedUrl> with the authorized URL.
       std::string signedUrl = "<signedUrl>";
   
       // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
       std::string filePath = "C:\\Users\\demo.txt";
   
       // Set the request headers. The request header information must be the same as the information used when the URL was generated.
       std::map<std::string, std::string> headers = {
            {"Content-Type", "text/plain;charset=utf8"},
            {"x-oss-storage-class", "Standard"}
       };
   
       // Set the custom user metadata. The custom user metadata must be the same as the information used when the URL was generated.
       std::map<std::string, std::string> metadata = {
            {"key1", "value1"},
            {"key2", "value2"}
       };
   
       uploadFile(signedUrl, filePath, headers, metadata);
   
       return 0;
   }
   

   Android

   import android.os.AsyncTask;
   import android.util.Log;
   
   import java.io.DataOutputStream;
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.IOException;
   import java.io.InputStream;
   import java.net.HttpURLConnection;
   import java.net.URL;
   import java.util.HashMap;
   import java.util.Map;
   import java.util.Map.Entry;
   
   public class SignUrlUploadActivity extends AppCompatActivity {
   
       private static final String TAG = "SignUrlUploadActivity";
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
   
           // Replace <signedUrl> with the authorized URL.
           String signedUrl = "<signedUrl>";
   
           // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
           String pathName = "/storage/emulated/0/demo.txt";
   
           // Set the request headers. The request header information must be the same as the information used when the URL was generated.
           Map<String, String> headers = new HashMap<>();
           headers.put("Content-Type", "text/plain;charset=utf8");
           headers.put("x-oss-storage-class", "Standard");
   
           // Set the custom user metadata. The custom user metadata must be the same as the information used when the URL was generated.
           Map<String, String> userMetadata = new HashMap<>();
           userMetadata.put("key1", "value1");
           userMetadata.put("key2", "value2");
   
           new UploadTask().execute(signedUrl, pathName, headers, userMetadata);
       }
   
       private class UploadTask extends AsyncTask<Object, Void, Integer> {
           @Override
           protected Integer doInBackground(Object... params) {
               String signedUrl = (String) params[0];
               String pathName = (String) params[1];
               Map<String, String> headers = (Map<String, String>) params[2];
               Map<String, String> userMetadata = (Map<String, String>) params[3];
   
               try {
                   URL url = new URL(signedUrl);
                   HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                   connection.setRequestMethod("PUT");
                   connection.setDoOutput(true);
                   connection.setUseCaches(false);
   
                   // Set the request headers.
                   for (Entry<String, String> header : headers.entrySet()) {
                       connection.setRequestProperty(header.getKey(), header.getValue());
                   }
   
                   // Set the custom user metadata.
                   for (Entry<String, String> meta : userMetadata.entrySet()) {
                       connection.setRequestProperty("x-oss-meta-" + meta.getKey(), meta.getValue());
                   }
   
                   // Read the file.
                   File file = new File(pathName);
                   FileInputStream fileInputStream = new FileInputStream(file);
                   DataOutputStream dos = new DataOutputStream(connection.getOutputStream());
   
                   byte[] buffer = new byte[1024];
                   int count;
                   while ((count = fileInputStream.read(buffer)) != -1) {
                       dos.write(buffer, 0, count);
                   }
   
                   fileInputStream.close();
                   dos.flush();
                   dos.close();
   
                   // Get the response.
                   int responseCode = connection.getResponseCode();
                   Log.d(TAG, "Status code returned for the upload: " + responseCode);
                   if (responseCode == 200) {
                       Log.d(TAG, "Upload successful using network library.");
                   } else {
                       Log.d(TAG, "Upload failed.");
                   }
   
                   InputStream is = connection.getInputStream();
                   byte[] responseBuffer = new byte[1024];
                   StringBuilder responseStringBuilder = new StringBuilder();
                   while ((count = is.read(responseBuffer)) != -1) {
                       responseStringBuilder.append(new String(responseBuffer, 0, count));
                   }
                   Log.d(TAG, responseStringBuilder.toString());
   
                   return responseCode;
               } catch (IOException e) {
                   e.printStackTrace();
                   return -1;
               }
           }
   
           @Override
           protected void onPostExecute(Integer result) {
               super.onPostExecute(result);
               if (result == 200) {
                   Toast.makeText(SignUrlUploadActivity.this, "Upload successful.", Toast.LENGTH_SHORT).show();
               } else {
                   Toast.makeText(SignUrlUploadActivity.this, "Upload failed.", Toast.LENGTH_SHORT).show();
               }
           }
       }
   }
   

Para realizar um upload multipart usando uma URL pré-assinada, configure o tamanho de cada parte e gere uma URL pré-assinada para cada parte. O código de exemplo a seguir ilustra esse processo:

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.common.utils.CRC64;
import com.aliyun.oss.internal.Mimetypes;
import com.aliyun.oss.model.*;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClients;
import java.io.*;
import java.net.URL;
import java.util.*;
import java.util.Date;

public class MultipartUrl {
    public static void main(String[] args) throws Throwable {
        // This example uses the public endpoint of the China (Hangzhou) region. Specify the actual endpoint.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 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.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the bucket name, for example, examplebucket.
        String bucketName = "examplebucket";
        // Specify the full path of the object, for example, exampleobject.txt. The full path of the object cannot contain the bucket name.
        String objectName = "exampleobject.txt";
        // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
        String pathName = "D:\\localpath\\examplefile.txt";
        // Specify the expiration time of the generated presigned URL in milliseconds. This example sets the expiration time to 1 hour.
        long expireTime = 3600*1000L;
        // Specify the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        // When the OSSClient instance is no longer in use, call the shutdown method to release resources.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(credentialsProvider)
                .clientConfiguration(clientBuilderConfiguration)
                .region(region)
                .build();

        // Create an InitiateMultipartUploadRequest object.
        InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest(bucketName, objectName);
        ObjectMetadata metadata = new ObjectMetadata();
        // Automatically set the ContentType based on the file. If this parameter is not set, the ContentType defaults to application/octet-stream.
        if (metadata.getContentType() == null) {
            metadata.setContentType(Mimetypes.getInstance().getMimetype(new File(pathName), objectName));
        }

        initRequest.setObjectMetadata(metadata);
        // Initialize the multipart upload.
        InitiateMultipartUploadResult upResult = ossClient.initiateMultipartUpload(initRequest);
        // The uploadId is returned. The uploadId is the unique identifier for the multipart upload event. You can use this uploadId to perform related operations, such as canceling or querying the multipart upload.
        String uploadId = upResult.getUploadId();

        // partETags is a collection of PartETags. A PartETag consists of the ETag and part number of a part.
        List<PartETag> partETags =  new ArrayList<PartETag>();
        // The size of each part in bytes, which is used to calculate the number of parts for the file.
        long partSize = 1 * 100 * 1024L;   // 100 KB.

        // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default.
        File sampleFile = new File(pathName);
        long fileLength = sampleFile.length();
        // If you want to have only one part, set the part size to the file size.
        // long fileLength = sampleFile.length();
        int partCount = (int) (fileLength / partSize);
        if (fileLength % partSize != 0) {
            partCount++;
        }

        // Set the request headers for the presigned URL.
        Map<String, String> headers = new HashMap<String, String>();
        // Specify the ContentType.
        // headers.put(OSSHeaders.CONTENT_TYPE, "text/plain");

        // Traverse the parts to obtain the signature for each part and upload the parts.
        // You can also return the presigned URLs for all parts at once and then upload them sequentially. This example shows how to return a single presigned URL and upload a single part using the presigned URL.
        for (int i = 0; i < partCount; i++) {
            long startPos = i * partSize;
            long curPartSize = (i + 1 == partCount) ? (fileLength - startPos) : partSize;

            /*// Set MD5 verification. MD5 verification is supported only for a single part.
            FileInputStream inStream = new FileInputStream(pathName);
            // Skip the uploaded parts.
            inStream.skip(startPos);
            BoundedInputStream entity = new BoundedInputStream(inStream, partSize);
            String md5 = BinaryUtil.toBase64String(DigestUtils.md5(entity));
            headers.put("Content-MD5", md5);*/

            String signUrl = getSignUrl(ossClient, bucketName, objectName, HttpMethod.PUT, expireTime, i + 1, uploadId, headers);

            // Upload the file using the presigned URL. This example uses HttpClients.
            putObjectWithHttp(signUrl, pathName, startPos, curPartSize, headers);
        }

        // Assume that when you merge the parts, you are on a different system from the one used to upload the parts. In this case, you must first list the parts and then merge them.
        // List the uploaded parts.
        ListPartsRequest listPartsRequest = new ListPartsRequest(bucketName, objectName, uploadId);
        PartListing partListing = ossClient.listParts(listPartsRequest);

        // Traverse the parts and populate partETags.
        for (PartSummary part : partListing.getParts()) {
            PartETag partETag = new PartETag(part.getPartNumber(), part.getETag());
            partETags.add(partETag);
        }

        // Merge the parts.
        CompleteMultipartUploadRequest completeMultipartUploadRequest =
                new CompleteMultipartUploadRequest(bucketName, objectName, uploadId, partETags);
        // String md5 = BinaryUtil.toBase64String(BinaryUtil.calculateMd5("aaa".getBytes()));
        // Forbid overwriting an object that has the same name.
        // completeMultipartUploadRequest.addHeader("x-oss-forbid-overwrite", "true");

        // Complete the multipart upload.
        CompleteMultipartUploadResult completeMultipartUploadResult = ossClient.completeMultipartUpload(completeMultipartUploadRequest);
        System.out.println("The parts are merged and the multipart upload is complete.");

        // Verify the integrity of the uploaded file.
        CRC64 crc = new CRC64();
        InputStream inStream = new FileInputStream(pathName);
        byte[] bytes = new byte[1024];
        int cnt;
        while ((cnt = inStream.read(bytes)) != -1) {
            crc.update(bytes, 0, cnt);
        }

        if(crc.getValue() == completeMultipartUploadResult.getServerCRC()){
            System.out.println("The uploaded file is complete.");
        } else {
            System.out.println("The uploaded file is incomplete. Handle the exception.");
        }
    }

    public static void putObjectWithHttp(String signedUrl, String pathName, long startPos, long partSize, Map<String, String> headers) throws IOException {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        try {
            HttpPut put = new HttpPut(signedUrl);

            FileInputStream inStream = new FileInputStream(pathName);
            // Skip the uploaded parts.
            inStream.skip(startPos);
            InputStreamEntity entity = new InputStreamEntity(inStream, partSize);
            BufferedHttpEntity byteArrayEntity = new BufferedHttpEntity(entity);
            put.setEntity(byteArrayEntity);

            // If you set header parameters, such as user metadata and storage class, when you generate the presigned URL, you must also send these parameters to the server when you use the presigned URL to upload the file. A signature error is reported if the parameters sent to the server are inconsistent with the signed parameters.
            for(Map.Entry header: headers.entrySet()){
                put.addHeader(header.getKey().toString(),header.getValue().toString());
            }

            // Add a retry mechanism. The number of retries is set to 3. This is just an example. Set the number of retries as needed for your business.
            httpClient = HttpClients.custom().setRetryHandler(new DefaultHttpRequestRetryHandler(3, true)).build();

            response = httpClient.execute(put);

            System.out.println("Status code returned for the upload:"+response.getStatusLine().getStatusCode());
            if(response.getStatusLine().getStatusCode() == 200){
                System.out.println("Upload successful using network library.");
            }
            System.out.println(response.toString());
        } catch (Exception e){
            e.printStackTrace();
        } finally {
            if(response != null){
                response.close();
            }
            if(httpClient != null){
                httpClient.close();
            }
        }
    }

    public static String getSignUrl(OSS ossClient, String bucketName, String objectName, HttpMethod method, long expireTime, int partNum, String uploadId, Map<String, String> headers){
        // Specify the expiration time of the generated presigned URL in milliseconds.
        Date expiration = new Date(new Date().getTime() + expireTime);

        // Generate a presigned URL.
        GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucketName, objectName, method);
        // Set the expiration time.
        request.setExpiration(expiration);

        // Add the request headers to the request.
        request.setHeaders(headers);

        request.addQueryParameter("partNumber", String.valueOf(partNum));

        request.addQueryParameter("uploadId", uploadId);

        // Generate a presigned URL for an HTTP method request.
        URL signedUrl = ossClient.generatePresignedUrl(request);
        // Print the presigned URL.
        System.out.println("signed url: " + signedUrl);
        return signedUrl.toString();
    }
}

1. O proprietário do objeto gera uma URL pré-assinada para uma requisição PUT com parâmetros de callback de upload especificados.

   import com.aliyun.oss.*;
   import com.aliyun.oss.common.auth.CredentialsProviderFactory;
   import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;
   import com.aliyun.oss.common.comm.SignVersion;
   import com.aliyun.oss.internal.OSSHeaders;
   import com.aliyun.oss.model.GeneratePresignedUrlRequest;
   
   import java.net.URL;
   import java.text.SimpleDateFormat;
   import java.util.*;
   
   public class OssPresignExample {
       public static void main(String[] args) throws Throwable {
           // This example uses the public endpoint of the China (Hangzhou) region. Specify the actual endpoint.
           String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
           // 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.
           EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
           // Specify the bucket name, for example, examplebucket.
           String bucketName = "examplebucket";
           // Specify the full path of the object, for example, exampleobject.txt. The full path of the object cannot contain the bucket name.
           String objectName = "exampleobject.txt";
           // Specify the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the region to cn-hangzhou.
           String region = "cn-hangzhou";
   
           // Create an OSSClient instance.
           // When the OSSClient instance is no longer in use, call the shutdown method to release resources.
           ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
           clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
           OSS ossClient = OSSClientBuilder.create()
                   .endpoint(endpoint)
                   .credentialsProvider(credentialsProvider)
                   .clientConfiguration(clientBuilderConfiguration)
                   .region(region)
                   .build();
   
           URL signedUrl = null;
           try {
               // Construct the callback parameters.
               String callbackUrl = "http://www.example.com/callback";
               String callbackBody = "{\"callbackUrl\":\"" + callbackUrl + "\",\"callbackBody\":\"bucket=${bucket}&object=${object}&my_var_1=${x:var1}&my_var_2=${x:var2}\"}";
               String callbackBase64 = Base64.getEncoder().encodeToString(callbackBody.getBytes());
   
               String callbackVarJson = "{\"x:var1\":\"value1\",\"x:var2\":\"value2\"}";
               String callbackVarBase64 = Base64.getEncoder().encodeToString(callbackVarJson.getBytes());
               // Set the request headers.
               Map<String, String> headers = new HashMap<String, String>();
               // Specify CALLBACK.
               headers.put(OSSHeaders.OSS_HEADER_CALLBACK, callbackBase64);
               // Specify CALLBACK-VAR.
               headers.put(OSSHeaders.OSS_HEADER_CALLBACK_VAR, callbackVarBase64);
   
               // Set the expiration time (3600 seconds later).
               Date expiration = new Date(new Date().getTime() + 3600 * 1000);
   
               // Format the expiration time.
               SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
               dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
               String expirationStr = dateFormat.format(expiration);
   
               // Construct the request.
               GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucketName, objectName);
               request.setMethod(HttpMethod.PUT);
               request.setExpiration(expiration);
               // Add the request headers to the request.
               request.setHeaders(headers);
   
               // Print the callback and callback-var parameters.
               System.out.println("callback:"+callbackBase64);
               System.out.println("callback-var:"+callbackVarBase64);
   
               // Generate the presigned URL.
               URL url = ossClient.generatePresignedUrl(request);
   
               // Print the result.
               System.out.println("method: PUT,");
               System.out.println(" expiration: " + expirationStr + ",");
               System.out.println(" url: " + url);
   
           } 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 (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());
           }
       }
   }

2. Outro usuário faz upload de um arquivo usando a URL pré-assinada para a requisição PUT.

   curl

   curl -X PUT \
        -H "x-oss-callback: eyJjYWxsYmFja1VybCI6Imh0dHA6Ly93d3cuZXhhbXBsZS5jb20vY2FsbGJhY2siLCJjYWxsYmFja0JvZHkiOiJidWNrZXQ9JHtidWNrZXR9Jm9iamVjdD0ke29iamVjdH0mbXlfdmFyXzE9JHt4OnZhcjF9Jm15X3Zhcl8yPSR7eDp2YXIyfSJ9" \
        -H "x-oss-callback-var: eyJ4OnZhcjEiOiJ2YWx1ZTEiLCJ4OnZhcjIiOiJ2YWx1ZTIifQ==" \
        -T "C:\\Users\\demo.txt" \
        "https://exampleobject.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T083238Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI****************%2F20241112%2Fcn-hangzhou%2Foss%2Faliyun_v4_request&x-oss-signature=ed5a******************************************************"

   Python

   import requests
   
   def upload_file(signed_url, file_path, headers=None):
       """
       Upload a file to OSS using a presigned URL.
   
       :param signed_url: The presigned URL.
       :param file_path: The full path of the file to upload.
       :param headers: Optional. Custom HTTP headers.
       :return: None
       """
       if not headers:
           headers = {}
   
       try:
           with open(file_path, 'rb') as file:
               response = requests.put(signed_url, data=file, headers=headers)
               print(f"Upload status code returned: {response.status_code}")
               if response.status_code == 200:
                   print("Upload successful using the network library.")
               else:
                   print("Upload failed.")
               print(response.text)
       except Exception as e:
           print(f"An error occurred: {e}")
   
   if __name__ == "__main__":
       # Replace <signedUrl> with the authorized URL.
       signed_url = "<signedUrl>"
   
       # Enter the full path of the local file. If you do not specify a local path, the file is uploaded from the directory where the script is located by default.
       file_path = "C:\\Users\\demo.txt"
   
       headers = {
           "x-oss-callback": "eyJjYWxsYmFja1VybCI6Imh0dHA6Ly93d3cuZXhhbXBsZS5jb20vY2FsbGJhY2siLCJjYWxsYmFja0JvZHkiOiJidWNrZXQ9JHtidWNrZXR9Jm9iamVjdD0ke29iamVjdH0mbXlfdmFyXzE9JHt4OnZhcjF9Jm15X3Zhcl8yPSR7eDp2YXIyfSJ9",
           "x-oss-callback-var": "eyJ4OnZhcjEiOiJ2YWx1ZTEiLCJ4OnZhcjIiOiJ2YWx1ZTIifQ==",
       }
   
       upload_file(signed_url,  file_path, headers)

   Go

   package main
   
   import (
       "bytes"
       "fmt"
       "io"
       "net/http"
       "os"
   )
   
   func uploadFile(signedUrl string, filePath string, headers map[string]string) error {
       // Open the file.
       file, err := os.Open(filePath)
       if err != nil {
           return err
       }
       defer file.Close()
   
       // Read the file content.
       fileBytes, err := io.ReadAll(file)
       if err != nil {
           return err
       }
   
       // Create a request.
       req, err := http.NewRequest("PUT", signedUrl, bytes.NewBuffer(fileBytes))
       if err != nil {
           return err
       }
   
       // Set request headers.
       for key, value := range headers {
           req.Header.Add(key, value)
       }
   
       // Send the request.
       client := &http.Client{}
       resp, err := client.Do(req)
       if err != nil {
           return err
       }
       defer resp.Body.Close()
   
       // Process the response.
       fmt.Printf("Upload status code returned: %d\n", resp.StatusCode)
       if resp.StatusCode == 200 {
           fmt.Println("Upload successful using the network library.")
       } else {
           fmt.Println("Upload failed.")
       }
       body, _ := io.ReadAll(resp.Body)
       fmt.Println(string(body))
   
       return nil
   }
   
   func main() {
       // Replace <signedUrl> with the authorized URL.
       signedUrl := "<signedUrl>"
       // Enter the full path of the local file. If you do not specify a local path, the file is uploaded from the project's corresponding local path by default.
       filePath := "C:\\Users\\demo.txt"
   
       // Set request headers. The header information here must be consistent with the information used to generate the URL.
       headers := map[string]string{
           "x-oss-callback":     "eyJjYWxsYmFja0JvZHkiOiJidWNrZXQ9JHtidWNrZXR9XHUwMDI2b2JqZWN0PSR7b2JqZWN0fVx1MDAyNnNpemU9JHtzaXplfVx1MDAyNm15X3Zhcl8xPSR7eDpteV92YXIxfVx1MDAyNm15X3Zhcl8yPSR7eDpteV92YXIyfSIsImNhbGxiYWNrQm9keVR5cGUiOiJhcHBsaWNhdGlvbi94LXd3dy1mb3JtLXVybGVuY29kZWQiLCJjYWxsYmFja1VybCI6Imh0dHA6Ly9leGFtcGxlLmNvbToyMzQ1MCJ9",
           "x-oss-callback-var": "eyJ4Om15X3ZhcjEiOiJ0aGkgaXMgdmFyIDEiLCJ4Om15X3ZhcjIiOiJ0aGkgaXMgdmFyIDIifQ==",
       }
   
       err := uploadFile(signedUrl, filePath, headers)
       if err != nil {
           fmt.Printf("An error occurred: %v\n", err)
       }
   }

   Java

   import org.apache.http.HttpEntity;
   import org.apache.http.client.methods.CloseableHttpResponse;
   import org.apache.http.client.methods.HttpPut;
   import org.apache.http.entity.FileEntity;
   import org.apache.http.impl.client.CloseableHttpClient;
   import org.apache.http.impl.client.HttpClients;
   import java.io.*;
   import java.net.URL;
   import java.util.*;
   
   public class SignUrlUpload {
     public static void main(String[] args) throws IOException {
       CloseableHttpClient httpClient = null;
       CloseableHttpResponse response = null;
   
       // Replace <signedUrl> with the authorized URL.
       URL signedUrl = new URL("<signedUrl>");
   
       // Enter the full path of the local file. If you do not specify a local path, the file is uploaded from the project's corresponding local path by default.
       String pathName = "C:\\Users\\demo.txt";
   
       // Set request headers, including x-oss-callback and x-oss-callback-var.
       Map<String, String> headers = new HashMap<String, String>();
       headers.put("x-oss-callback", "eyJjYWxsYmFja1VybCI6Imh0dHA6Ly93d3cuZXhhbXBsZS5jb20vY2FsbGJhY2siLCJjYWxsYmFja0JvZHkiOiJidWNrZXQ9JHtidWNrZXR9Jm9iamVjdD0ke29iamVjdH0mbXlfdmFyXzE9JHt4OnZhcjF9Jm15X3Zhcl8yPSR7eDp2YXIyfSJ9");
       headers.put("x-oss-callback-var", "eyJ4OnZhcjEiOiJ2YWx1ZTEiLCJ4OnZhcjIiOiJ2YWx1ZTIifQ==");
   
       try {
         HttpPut put = new HttpPut(signedUrl.toString());
         System.out.println(put);
         HttpEntity entity = new FileEntity(new File(pathName));
         put.setEntity(entity);
         // If header parameters were set when generating the presigned URL, these parameters must also be sent to the server when using the presigned URL to upload the file. If the signature and the parameters sent to the server do not match, a signature error will occur.
         for(Map.Entry<String, String> header: headers.entrySet()){
           put.addHeader(header.getKey(),header.getValue());
         }
   
         httpClient = HttpClients.createDefault();
   
         response = httpClient.execute(put);
   
         System.out.println("Upload status code returned:"+response.getStatusLine().getStatusCode());
         if(response.getStatusLine().getStatusCode() == 200){
           System.out.println("Upload successful using the network library.");
         }
         System.out.println(response.toString());
       } catch (Exception e){
         e.printStackTrace();
       } finally {
         if (response != null) {
           response.close();
         }
         if (httpClient != null) {
           httpClient.close();
         }
       }
     }
   }       

   PHP

   <?php
   
   function uploadFile($signedUrl, $filePath, $headers = []) {
       // Check if the file exists.
       if (!file_exists($filePath)) {
           echo "File does not exist: $filePath\n";
           return;
       }
   
       // Initialize cURL session.
       $ch = curl_init();
   
       // Set cURL options.
       curl_setopt($ch, CURLOPT_URL, $signedUrl);
       curl_setopt($ch, CURLOPT_PUT, true);
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
       curl_setopt($ch, CURLOPT_INFILE, fopen($filePath, 'rb'));
       curl_setopt($ch, CURLOPT_INFILESIZE, filesize($filePath));
       curl_setopt($ch, CURLOPT_HTTPHEADER, array_map(function($key, $value) {
           return "$key: $value";
       }, array_keys($headers), $headers));
   
       // Execute cURL request.
       $response = curl_exec($ch);
   
       // Get HTTP status code.
       $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
   
       // Close cURL session.
       curl_close($ch);
   
       // Output the result.
       echo "Upload status code returned: $httpCode\n";
       if ($httpCode == 200) {
           echo "Upload successful using the network library.\n";
       } else {
           echo "Upload failed.\n";
       }
       echo $response . "\n";
   }
   
   // Replace <signedUrl> with the authorized URL.
   $signedUrl = "<signedUrl>";
   
   // Enter the full path of the local file. If you do not specify a local path, the file is uploaded from the directory where the script is located by default.
   $filePath = "C:\\Users\\demo.txt";
   
   $headers = [
       "x-oss-callback" => "eyJjYWxsYmFja1VybCI6Imh0dHA6Ly93d3cuZXhhbXBsZS5jb20vY2FsbGJhY2siLCJjYWxsYmFja0JvZHkiOiJidWNrZXQ9JHtidWNrZXR9Jm9iamVjdD0ke29iamVjdH0mbXlfdmFyXzE9JHt4OnZhcjF9Jm15X3Zhcl8yPSR7eDp2YXIyfSJ9",
       "x-oss-callback-var" => "eyJ4OnZhcjEiOiJ2YWx1ZTEiLCJ4OnZhcjIiOiJ2YWx1ZTIifQ==",
   ];
   
   uploadFile($signedUrl, $filePath, $headers);
   
   ?>