Object Storage Service:Upload an object by using a presigned URL (Python SDK V2)

1. El propietario del archivo genera una URL prefirmada para el método PUT con los encabezados de solicitud y los metadatos personalizados especificados.

   import argparse
   import requests
   import alibabacloud_oss_v2 as oss
   
   from datetime import datetime, timedelta
   
   # Create a command-line argument parser and describe the script's purpose: to generate a presigned PUT request URL for an object (Presign Put Object).
   parser = argparse.ArgumentParser(description="presign put object sample")
   
   # Define command-line arguments, including the required region, bucket name, endpoint, and object key.
   parser.add_argument('--region', help='The region in which the bucket is located.', required=True)
   parser.add_argument('--bucket', help='The name of the bucket.', required=True)
   parser.add_argument('--endpoint', help='The domain names that other services can use to access OSS')
   parser.add_argument('--key', help='The name of the object.', required=True)
   
   def main():
       # Parse command-line arguments to get user-provided values.
       args = parser.parse_args()
   
       # Load access credential information from environment variables for identity verification.
       credentials_provider = oss.credentials.EnvironmentVariableCredentialsProvider()
   
       # Create a configuration object using the SDK's default settings and set the authentication provider.
       cfg = oss.config.load_default()
       cfg.credentials_provider = credentials_provider
   
       # Set the region property of the configuration object based on the command-line arguments.
       cfg.region = args.region
   
       # If a custom endpoint is provided, update the endpoint property in the configuration object.
       if args.endpoint is not None:
           cfg.endpoint = args.endpoint
   
       # Initialize the OSS client with the above configuration to interact with OSS.
       client = oss.Client(cfg)
   
       # Send a request to generate a presigned PUT request for the specified object.
       pre_result = client.presign(oss.PutObjectRequest(
           bucket=args.bucket,  # Bucket name
           key=args.key,  # Object key
           content_type='text/plain;charset=utf8',  # Specify the content type.
           storage_class='Standard',  # Specify the storage class.
           metadata={
               'key1': 'value1',   # Specify the metadata.
               'key2': 'value2'    # Specify the metadata.
           }
       ),expires=timedelta(seconds=3600)) # Set the expiration time in seconds. Here, it is set to 3600 seconds.
   
       # Print the method, expiration time, and URL of the presigned request to confirm the validity of the link.
       print(f'method: {pre_result.method},'
             f' expiration: {pre_result.expiration.strftime("%Y-%m-%dT%H:%M:%S.000Z")},'
             f' url: {pre_result.url}'
             )
   
       # Print the signed header information of the presigned request. This information will be included in the HTTP headers when the actual request is sent.
       for key, value in pre_result.signed_headers.items():
           print(f'signed headers key: {key}, signed headers value: {value}')
   
   # When this script is executed directly, call the main function to start the processing logic.
   if __name__ == "__main__":
       main()  # Script entry point. The program flow starts here.

2. Otro usuario carga un archivo mediante la URL prefirmada para el método 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

   Si se presenta un error 403 de discrepancia de firma al cargar un archivo con Browser.js, generalmente se debe a que el navegador agrega automáticamente el encabezado de solicitud Content-Type. Este encabezado no se incluyó cuando se generó la URL prefirmada, lo que provoca un fallo en la verificación de la firma. Para resolver este problema, especifique el encabezado de solicitud Content-Type al generar la URL prefirmada.

   <!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 ejecutar una carga multiparte mediante una URL prefirmada, configure el tamaño de cada parte y genere una URL prefirmada por cada una de ellas. A continuación se muestra un ejemplo de código:

import argparse
import os
import requests
import alibabacloud_oss_v2 as oss

# Create a command-line argument parser and describe the script's purpose: to generate a presigned multipart upload request sample.
parser = argparse.ArgumentParser(description="presign multipart upload sample")

# Add the --region command-line argument, which indicates the region where the bucket is located. This is a required parameter.
parser.add_argument('--region', help='The region in which the bucket is located.', required=True)
# Add the --bucket command-line argument, which indicates the name of the bucket to which you want to upload the object. This is a required parameter.
parser.add_argument('--bucket', help='The name of the bucket.', required=True)
# Add the --endpoint command-line argument, which indicates the domain name that other services can use to access OSS. This is an optional parameter.
parser.add_argument('--endpoint', help='The domain names that other services can use to access OSS')
# Add the --key command-line argument, which indicates the key (file name) of the object in OSS. This is a required parameter.
parser.add_argument('--key', help='The name of the object.', required=True)
# Add the --file_path command-line argument, which indicates the path of the file to upload. This is a required parameter.
parser.add_argument('--file_path', help='The path of Upload file.', required=True)

def main():
    # Parse the command-line arguments to get the user-provided values.
    args = parser.parse_args()

    # Load the authentication information required to access OSS from environment variables for identity verification.
    credentials_provider = oss.credentials.EnvironmentVariableCredentialsProvider()

    # Create a configuration object using the SDK's default settings and set the authentication provider.
    cfg = oss.config.load_default()
    cfg.credentials_provider = credentials_provider

    # Set the region property of the configuration object based on the command-line arguments.
    cfg.region = args.region

    # If a custom endpoint is provided, update the endpoint property in the configuration object.
    if args.endpoint is not None:
        cfg.endpoint = args.endpoint

    # Initialize the OSS client with the above configuration to interact with OSS.
    client = oss.Client(cfg)

    # Part size is 1 MB.
    part_size = 1024 * 1024
    # Get the file size.
    data_size = os.path.getsize(args.file_path)
    part_number = 1
    upload_parts = []

    # Initialize the multipart upload request.
    init_pre_result = client.presign(oss.InitiateMultipartUploadRequest(
        bucket=args.bucket,
        key=args.key,
    ))

    # Initiate the request.
    with requests.post(init_pre_result.url, headers=init_pre_result.signed_headers) as resp:
        obj = oss.InitiateMultipartUploadResult()
        oss.serde.deserialize_xml(xml_data=resp.content, obj=obj)

        # Open the file for reading.
        with open(args.file_path, 'rb') as f:
            for start in range(0, data_size, part_size):
                n = part_size
                if start + n > data_size:
                    n = data_size - start
                reader = oss.io_utils.SectionReader(oss.io_utils.ReadAtReader(f), start, n)

                # Generate a presigned request to upload a part.
                up_pre_result = client.presign(oss.UploadPartRequest(
                    bucket=args.bucket,
                    key=args.key,
                    upload_id=obj.upload_id,
                    part_number=part_number,
                ))

                # Upload the part data.
                with requests.put(up_pre_result.url, headers=up_pre_result.signed_headers, data=reader) as up_result:
                    print(f'status code: {up_result.status_code},'
                          f' request id: {up_result.headers.get("x-oss-request-id")},'
                          f' part number: {part_number},'
                          f' hash crc64: {up_result.headers.get("x-oss-hash-crc64ecma")},'
                          f' content md5: {up_result.headers.get("Content-MD5")},'
                          f' etag: {up_result.headers.get("ETag")},'
                          f' server time: {up_result.headers.get("x-oss-server-time")}'
                    )

                    # Record the ETag and number of each part.
                    upload_parts.append(oss.UploadPart(part_number=part_number, etag=up_result.headers.get("ETag")))
                part_number += 1

        # Sort the parts by part number.
        parts = sorted(upload_parts, key=lambda p: p.part_number)

        # Complete the multipart upload request.
        request = oss.CompleteMultipartUploadRequest(
            bucket=args.bucket,
            key=args.key,
            upload_id=obj.upload_id,
            complete_multipart_upload=oss.CompleteMultipartUpload(
                parts=parts
            )
        )

        # Serialize the input for the complete request.
        op_input = oss.serde.serialize_input(request, oss.OperationInput(
            op_name='CompleteMultipartUpload',
            method='POST',
            bucket=request.bucket,
        ))

        # Generate a presigned request to complete the upload.
        complete_pre_result = client.presign(request)

        # Send the request to complete the upload.
        with requests.post(complete_pre_result.url, headers=complete_pre_result.signed_headers, data=op_input.body) as complete_resp:
            result = oss.CompleteMultipartUploadResult()
            oss.serde.deserialize_xml(xml_data=complete_resp.content, obj=result)
            print(f'status code: {complete_resp.status_code},'
                  f' request id: {complete_resp.headers.get("x-oss-request-id")},'
                  f' hash crc64: {complete_resp.headers.get("x-oss-hash-crc64ecma")},'
                  f' content md5: {complete_resp.headers.get("Content-MD5")},'
                  f' etag: {complete_resp.headers.get("ETag")},'
                  f' content length: {complete_resp.headers.get("content-length")},'
                  f' content type: {complete_resp.headers.get("Content-Type")},'
                  f' url: {result.location},'
                  f' encoding type: {result.encoding_type},'
                  f' server time: {complete_resp.headers.get("x-oss-server-time")}'
            )

        # Print the method, expiration time, and URL of the complete request.
        print(f'method: {complete_pre_result.method},'
              f' expiration: {complete_pre_result.expiration.strftime("%Y-%m-%dT%H:%M:%S.000Z")},'
              f' url: {complete_pre_result.url}'
        )

        # Print the signed header information of the complete request.
        for key, value in complete_pre_result.signed_headers.items():
            print(f'signed headers key: {key}, signed headers value: {value}')

# When this script is executed directly, call the main function to start the processing logic.
if __name__ == "__main__":
    main()  # Script entry point. The program flow starts here.

1. El propietario del archivo genera una URL prefirmada para el método PUT con los parámetros de devolución de llamada de carga especificados.

   import argparse
   import base64
   import requests
   import alibabacloud_oss_v2 as oss
   
   from datetime import datetime, timedelta
   
   # Create a command-line argument parser and describe the script's purpose: to generate a presigned PUT request URL for an object (Presign Put Object).
   parser = argparse.ArgumentParser(description="presign put object sample")
   
   # Define command-line arguments, including the required region, bucket name, endpoint, and object key.
   parser.add_argument('--region', help='The region in which the bucket is located.', required=True)
   parser.add_argument('--bucket', help='The name of the bucket.', required=True)
   parser.add_argument('--endpoint', help='The domain names that other services can use to access OSS')
   parser.add_argument('--key', help='The name of the object.', required=True)
   
   def main():
       # Parse command-line arguments to get user-provided values.
       args = parser.parse_args()
   
       # Load access credential information from environment variables for identity verification.
       credentials_provider = oss.credentials.EnvironmentVariableCredentialsProvider()
   
       # Create a configuration object using the SDK's default settings and set the authentication provider.
       cfg = oss.config.load_default()
       cfg.credentials_provider = credentials_provider
   
       # Set the region property of the configuration object based on the command-line arguments.
       cfg.region = args.region
   
       # If a custom endpoint is provided, update the endpoint property in the configuration object.
       if args.endpoint is not None:
           cfg.endpoint = args.endpoint
   
       # Initialize the OSS client with the above configuration to interact with OSS.
       client = oss.Client(cfg)
   
       # Enter your custom webhook address.
       call_back_url = "http://www.example.com/callback"
       # Construct the callback parameter (callback): specify the webhook address and the callback request body, encoded in Base64.
       callback=base64.b64encode(str('{\"callbackUrl\":\"' + call_back_url + '\",\"callbackBody\":\"bucket=${bucket}&object=${object}&my_var_1=${x:var1}&my_var_2=${x:var2}\"}').encode()).decode()
       # Construct the custom variables (callback-var), encoded in Base64.
       callback_var=base64.b64encode('{\"x:var1\":\"value1\",\"x:var2\":\"value2\"}'.encode()).decode()
   
       # Send a request to generate a presigned PUT request for the specified object.
       pre_result = client.presign(oss.PutObjectRequest(
           bucket=args.bucket,  # Bucket name
           key=args.key,  # Object key
           callback=callback,
           callback_var=callback_var,
       ),expires=timedelta(seconds=3600)) # Set the expiration time in seconds. Here, it is set to 3600 seconds.
   
       # Print the method, expiration time, and URL of the presigned request to confirm the validity of the link.
       print(f'method: {pre_result.method},'
             f' expiration: {pre_result.expiration.strftime("%Y-%m-%dT%H:%M:%S.000Z")},'
             f' url: {pre_result.url}'
             )
   
       # Print the signed header information of the presigned request. This information will be included in the HTTP headers when the actual request is sent.
       for key, value in pre_result.signed_headers.items():
           print(f'signed headers key: {key}, signed headers value: {value}')
   
   # When this script is executed directly, call the main function to start the processing logic.
   if __name__ == "__main__":
       main()  # Script entry point. The program flow starts here.

2. Otro usuario carga un archivo mediante la URL prefirmada para el método 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);
   
   ?>

La carga se completará de forma exitosa.

Se utiliza una URL prefirmada para las cargas. Esta URL sigue siendo válida durante el menor de estos dos periodos: el periodo de validez del token o su propio periodo de validez.

No es obligatorio configurarlos.

Los encabezados de solicitud y los metadatos personalizados son parámetros opcionales. Si no los establece al generar la URL, tampoco necesita incluirlos en la solicitud de carga.