Os objetos do OSS são privados por padrão. Gere uma URL pré-assinada com o OSS SDK for PHP para permitir que terceiros façam o upload de objetos no seu bucket dentro de um período de validade especificado. A URL permite vários uploads durante sua validade, e o objeto enviado pode ser sobrescrito. Após o término da validade, gere uma nova URL pré-assinada.
Observações
Este tópico usa o endpoint público da região China (Hangzhou). Para acessar o OSS a partir de outros serviços da Alibaba Cloud na mesma região, use um endpoint interno. Para obter detalhes sobre as regiões e os endpoints compatíveis, consulte Regions and endpoints.
Este tópico usa credenciais de acesso de variáveis de ambiente. Para obter mais informações sobre como configurar credenciais de acesso, consulte Configure access credentials (PHP SDK V1).
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Para gerar uma URL pré-assinada para upload de objetos, é necessária a permissão
oss:PutObject. Para obter mais informações, consulte Grant a custom policy.NotaO SDK gera URLs pré-assinadas localmente no cliente, sem enviar solicitações ao servidor. Portanto, não são necessárias permissões especiais para gerar a URL. No entanto, o chamador precisa ter as permissões exigidas pelas operações autorizadas pela URL pré-assinada.
Este tópico usa URLs pré-assinadas V4 com validade de até sete dias. Para obter mais informações, consulte (Recommended) V4 signatures in presigned URLs.
A URL pré-assinada gerada pode conter um sinal de mais (
+). Substitua o sinal de mais (+) na URL por%2B. Caso contrário, a URL pode não funcionar conforme o esperado.Para gerar uma URL pré-assinada HTTPS, defina o protocolo do endpoint como HTTPS.
Processo
O fluxograma a seguir mostra como fazer o upload de um objeto para o OSS por meio de uma URL pré-assinada com HTTP PUT.
Código de exemplo
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O proprietário do objeto gera uma URL pré-assinada que permite solicitações HTTP PUT.
<?php if (is_file(__DIR__ . '/../autoload.php')) { require_once __DIR__ . '/../autoload.php'; } if (is_file(__DIR__ . '/../vendor/autoload.php')) { require_once __DIR__ . '/../vendor/autoload.php'; } use OSS\OssClient; use OSS\Core\OssException; use OSS\Http\RequestCore; use OSS\Http\ResponseCore; use OSS\Credentials\EnvironmentVariableCredentialsProvider; // Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. $provider = new EnvironmentVariableCredentialsProvider(); // Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. $endpoint = "yourEndpoint"; // Specify the name of the bucket. $bucket= "examplebucket"; // Specify the full path of the object. Do not include the bucket name in the full path of the object. $object = "exampleobject.txt"; // Set the validity period of the presigned URL to 600 seconds. Maximum value: 32400. $timeout = 600; try { $config = array( "provider" => $provider, "endpoint" => $endpoint, 'signatureVersion'=>OssClient::OSS_SIGNATURE_VERSION_V4, "region"=> "cn-hangzhou" ); $ossClient = new OssClient($config); // Generate the presigned URL. $signedUrl = $ossClient->signUrl($bucket, $object, $timeout, "PUT"); print_r($signedUrl); } catch (OssException $e) { printf(__FUNCTION__ . ": FAILED\n"); printf($e->getMessage() . "\n"); return; } -
Faça o upload de um objeto usando a URL pré-assinada.
curl
curl -X PUT -T /path/to/local/file "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
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"; try { HttpPut put = new HttpPut(signedUrl.toString()); System.out.println(put); HttpEntity entity = new FileEntity(new File(pathName)); put.setEntity(entity); 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 ( "fmt" "io" "net/http" "os" ) func uploadFile(signedUrl, filePath string) error { // Open the file. file, err := os.Open(filePath) if err != nil { return fmt.Errorf("Unable to open file: %w", err) } defer file.Close() // Create a new HTTP client. client := &http.Client{} // Create a PUT request. req, err := http.NewRequest("PUT", signedUrl, file) if err != nil { return fmt.Errorf("Failed to create request: %w", err) } // Send the request. resp, err := client.Do(req) if err != nil { return fmt.Errorf("Failed to send request: %w", err) } defer resp.Body.Close() // Read the response. body, err := io.ReadAll(resp.Body) if err != nil { return fmt.Errorf("Failed to read response: %w", err) } fmt.Printf("Status code returned for the upload: %d\n", resp.StatusCode) if resp.StatusCode == 200 { fmt.Println("Upload successful using network library.") } 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" err := uploadFile(signedUrl, filePath) if err != nil { fmt.Println("An error occurred:", err) } }python
import requests def upload_file(signed_url, file_path): try: # Open the file. with open(file_path, 'rb') as file: # Send a PUT request to upload the file. response = requests.put(signed_url, data=file) print(f"Status code returned for the upload: {response.status_code}") if response.status_code == 200: print("Upload successful using network library.") 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 project path of the sample program by default. file_path = "C:\\Users\\demo.txt" upload_file(signed_url, file_path)Node.js
ImportanteAo usar o Node.js para fazer o upload de um arquivo, um erro 403 de incompatibilidade de assinatura geralmente ocorre se o cabeçalho de solicitação Content-Type estiver definido explicitamente no upload, mas não tiver sido incluído na geração da URL pré-assinada. Isso causa falha na verificação da assinatura. Para resolver, não defina o cabeçalho Content-Type na solicitação de upload ou especifique-o ao gerar a URL pré-assinada.
const fs = require('fs'); const axios = require('axios'); async function uploadFile(signedUrl, filePath) { try { // Create a read stream. const fileStream = fs.createReadStream(filePath); // Send a PUT request to upload the file. const response = await axios.put(signedUrl, fileStream); console.log(`Status code returned for the upload: ${response.status}`); if (response.status === 200) { console.log('Upload successful using network library.'); } 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 project path of the sample program by default. const filePath = 'C:\\Users\\demo.txt'; await uploadFile(signedUrl, filePath); })();browser.js
ImportanteAo usar o Browser.js para fazer o upload de um arquivo, um erro 403 de incompatibilidade de assinatura geralmente ocorre porque o navegador adiciona automaticamente o cabeçalho de solicitação Content-Type, o qual não foi incluído na geração da URL pré-assinada. Isso causa falha na verificação da assinatura. Para resolver, especifique o cabeçalho 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</h1> <!-- Select a file --> <input type="file" id="fileInput" /> <button id="uploadButton">Upload File</button> <script> // Replace this with the presigned URL generated in Step 1. const signedUrl = "<signedUrl>"; document.getElementById('uploadButton').addEventListener('click', async () => { const fileInput = document.getElementById('fileInput'); const file = fileInput.files[0]; if (!file) { alert('Please select a file to upload.'); return; } try { await upload(file, signedUrl); alert('File uploaded successfully!'); } catch (error) { console.error('Error during upload:', error); alert('Upload failed: ' + error.message); } }); /** * Upload the file to OSS. * @param {File} file - The file to upload. * @param {string} presignedUrl - The presigned URL. */ const upload = async (file, presignedUrl) => { const response = await fetch(presignedUrl, { method: 'PUT', body: file, // Upload the entire file directly. }); if (!response.ok) { throw new Error(`Upload failed, status: ${response.status}`); } console.log('File uploaded successfully'); }; </script> </body> </html>C#
using System.Net.Http.Headers; // Specify the full path of the local file. If you do not specify a local path, the file is uploaded from the project path of the sample program by default. var filePath = "C:\\Users\\demo.txt"; // Replace <signedUrl> with the authorized URL. var presignedUrl = "<signedUrl>"; // Create an HTTP client and open the local file stream. using var httpClient = new HttpClient(); using var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read); using var content = new StreamContent(fileStream); // Create a PUT request. var request = new HttpRequestMessage(HttpMethod.Put, presignedUrl); request.Content = content; // Send the request. var response = await httpClient.SendAsync(request); // Process the response. if (response.IsSuccessStatusCode) { Console.WriteLine($"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> void uploadFile(const std::string& signedUrl, const std::string& filePath) { CURL *curl; CURLcode res; 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; } // Get the file size. fseek(file, 0, SEEK_END); long fileSize = ftell(file); fseek(file, 0, SEEK_SET); // Set the file size. curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)fileSize); // Set the input file handle. curl_easy_setopt(curl, CURLOPT_READDATA, file); // Execute the request. res = curl_easy_perform(curl); if (res != CURLE_OK) { std::cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << std::endl; } else { long httpCode = 0; curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpCode); std::cout << "Status code returned for the upload: " << httpCode << std::endl; if (httpCode == 200) { std::cout << "Upload successful using network library." << std::endl; } } // Close the file. fclose(file); // Clean up. 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"; uploadFile(signedUrl, filePath); return 0; }Android
package com.example.signurlupload; import android.os.AsyncTask; import android.util.Log; import java.io.DataOutputStream; import java.io.FileInputStream; import java.io.IOException; import java.net.HttpURLConnection; import java.net.URL; public class SignUrlUploadActivity { private static final String TAG = "SignUrlUploadActivity"; public void uploadFile(String signedUrl, String filePath) { new UploadTask().execute(signedUrl, filePath); } private class UploadTask extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... params) { String signedUrl = params[0]; String filePath = params[1]; HttpURLConnection connection = null; DataOutputStream dos = null; FileInputStream fis = null; try { URL url = new URL(signedUrl); connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("PUT"); connection.setDoOutput(true); connection.setRequestProperty("Content-Type", "application/octet-stream"); fis = new FileInputStream(filePath); dos = new DataOutputStream(connection.getOutputStream()); byte[] buffer = new byte[1024]; int length; while ((length = fis.read(buffer)) != -1) { dos.write(buffer, 0, length); } dos.flush(); dos.close(); fis.close(); 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."); } return "Upload complete. Status code: " + responseCode; } catch (IOException e) { e.printStackTrace(); return "Upload failed: " + e.getMessage(); } finally { if (connection != null) { connection.disconnect(); } } } @Override protected void onPostExecute(String result) { Log.d(TAG, result); } } public static void main(String[] args) { SignUrlUploadActivity activity = new SignUrlUploadActivity(); // 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 filePath = "C:\\Users\\demo.txt"; activity.uploadFile(signedUrl, filePath); } }