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PHP使用簽名URL上傳

默認情況下,OSS Bucket中的文件是私有的,僅文件擁有者可訪問。您可以使用OSS Java SDK生成帶有過期時間的GET方法簽名URL,以允許他人臨時下載文件。在有效期內可多次訪問,超期后需重新生成。

注意事項

  • 本文以華東1(杭州)外網Endpoint為例。如果您希望通過與OSS同地域的其他阿里云產品訪問OSS,請使用內網Endpoint。關于OSS支持的RegionEndpoint的對應關系,請參見OSS地域和訪問域名

  • 本文以從環境變量讀取訪問憑證為例。如何配置訪問憑證,請參見Java配置訪問憑證

  • 本文以OSS域名新建OSSClient為例。如果您希望通過自定義域名、STS等方式新建OSSClient,請參見新建OSSClient

  • 生成GET方法的簽名URL時,您必須具有oss:GetObject權限。具體操作,請參見RAM用戶授權自定義的權限策略

    說明

    生成簽名URL過程中,SDK利用本地存儲的密鑰信息,根據特定算法計算出簽名(signature),然后將其附加到URL上,以確保URL的有效性和安全性。這一系列計算和構造URL的操作都是在客戶端完成,不涉及網絡請求到服務端。因此,生成簽名URL時不需要授予調用者特定權限。但是,為避免第三方用戶無法對簽名URL授權的資源執行相關操作,需要確保調用生成簽名URL接口的身份主體被授予對應的權限。

  • 本文以V4簽名URL為例,有效期最大為7天。更多信息,請參見簽名版本4(推薦)

  • 通過以下示例生成的簽名URL中如果包含特殊符號+,可能出現無法正常訪問該簽名URL的現象。如需正常訪問該簽名URL,請將簽名URL中的+替換為%2B

  • 如果需要生成HTTPS協議的簽名URL,請將Endpoint中的通信協議設置為HTTPS。

使用過程

使用簽名URL下載文件的過程如下:

image

代碼示例

  1. 文件擁有者生成GET方法的簽名URL。

    <?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;
    
    // 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_IDOSS_ACCESS_KEY_SECRET。
    $accessKeyId = getenv("OSS_ACCESS_KEY_ID");
    $accessKeySecret = getenv("OSS_ACCESS_KEY_SECRET");
    // yourEndpoint填寫Bucket所在地域對應的Endpoint。以華東1(杭州)為例,Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。
    $endpoint = "yourEndpoint";
    // 填寫Bucket名稱。
    $bucket= "examplebucket";
    // 填寫不包含Bucket名稱在內的Object完整路徑。
    $object = "exampleobject.txt";
    // 指定簽名URL的過期時間為600s(最長可達32400s)。
    $timeout = 600;
    // 生成預覽的簽名URL,然后使用Bucket綁定的自定義域名進行訪問。
    $options= array(
        "response-content-disposition"=>"inline",);
    // 生成下載的簽名URL。
    /*$options = array(
        "response-content-disposition"=>"attachment",
    );*/
    try {
        $ossClient = new OssClient($accessKeyId, $accessKeySecret, $endpoint, false);
        $signedUrl = $ossClient->signUrl($bucket, $object, $timeout,'GET',$options);
    
    } catch (OssException $e) {
        printf(__FUNCTION__ . ": FAILED\n");
        printf($e->getMessage() . "\n");
        return;
    }
    print(__FUNCTION__ . ": signedUrl: " . $signedUrl . "\n");               
  2. 其他人使用GET方法的簽名URL下載文件。

    curl

    curl -SO "https://examplebucket.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T092756Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI5************/20241112/cn-hangzhou/oss/aliyun_v4_request&x-oss-signature=ed5a939feb8d79a389572719f7e2939939936d0**********"

    Java

    import java.io.BufferedInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    
    public class Demo {
        public static void main(String[] args) {
            // 替換為生成的GET方法的簽名URL。
            String fileURL = "https://examplebucket.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T092756Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI5************/20241112/cn-hangzhou/oss/aliyun_v4_request&x-oss-signature=ed5a939feb8d79a389572719f7e2939939936d0**********";
            // 填寫文件保存的目標路徑,包括文件名和擴展名。
            String savePath = "C:/downloads/myfile.txt";
    
            try {
                downloadFile(fileURL, savePath);
                System.out.println("Download completed!");
            } catch (IOException e) {
                System.err.println("Error during download: " + e.getMessage());
            }
        }
    
        private static void downloadFile(String fileURL, String savePath) throws IOException {
            URL url = new URL(fileURL);
            HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
            httpConn.setRequestMethod("GET");
    
            // 檢查響應代碼
            int responseCode = httpConn.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 輸入流
                InputStream inputStream = new BufferedInputStream(httpConn.getInputStream());
                // 輸出流
                FileOutputStream outputStream = new FileOutputStream(savePath);
    
                byte[] buffer = new byte[4096]; // 緩沖區
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
    
                outputStream.close();
                inputStream.close();
            } else {
                System.out.println("No file to download. Server replied HTTP code: " + responseCode);
            }
            httpConn.disconnect();
        }
    }

    Node.js

    const https = require('https');
    const fs = require('fs');
    
    const fileURL = "https://examplebucket.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T092756Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI5************/20241112/cn-hangzhou/oss/aliyun_v4_request&x-oss-signature=ed5a939feb8d79a389572719f7e2939939936d0**********";
    const savePath = "C:/downloads/myfile.txt";
    
    https.get(fileURL, (response) => {
        if (response.statusCode === 200) {
            const fileStream = fs.createWriteStream(savePath);
            response.pipe(fileStream);
            
            fileStream.on('finish', () => {
                fileStream.close();
                console.log("Download completed!");
            });
        } else {
            console.error(`Download failed. Server responded with code: ${response.statusCode}`);
        }
    }).on('error', (err) => {
        console.error("Error during download:", err.message);
    });

    Python

    import requests
    
    file_url = "https://examplebucket.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T092756Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI5************/20241112/cn-hangzhou/oss/aliyun_v4_request&x-oss-signature=ed5a939feb8d79a389572719f7e2939939936d0**********"
    save_path = "C:/downloads/myfile.txt"
    
    try:
        response = requests.get(file_url, stream=True)
        if response.status_code == 200:
            with open(save_path, 'wb') as f:
                for chunk in response.iter_content(4096):
                    f.write(chunk)
            print("Download completed!")
        else:
            print(f"No file to download. Server replied HTTP code: {response.status_code}")
    except Exception as e:
        print("Error during download:", e)

    Go

    package main
    
    import (
        "io"
        "net/http"
        "os"
    )
    
    func main() {
        fileURL := "https://examplebucket.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T092756Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI5************/20241112/cn-hangzhou/oss/aliyun_v4_request&x-oss-signature=ed5a939feb8d79a389572719f7e2939939936d0**********"
        savePath := "C:/downloads/myfile.txt"
    
        response, err := http.Get(fileURL)
        if err != nil {
            panic(err)
        }
        defer response.Body.Close()
    
        if response.StatusCode == http.StatusOK {
            outFile, err := os.Create(savePath)
            if err != nil {
                panic(err)
            }
            defer outFile.Close()
    
            _, err = io.Copy(outFile, response.Body)
            if err != nil {
                panic(err)
            }
            println("Download completed!")
        } else {
            println("No file to download. Server replied HTTP code:", response.StatusCode)
        }
    }

    JavaScript

    const fileURL = "https://examplebucket.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T092756Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI5************/20241112/cn-hangzhou/oss/aliyun_v4_request&x-oss-signature=ed5a939feb8d79a389572719f7e2939939936d0**********";
    const savePath = "C:/downloads/myfile.txt"; // 文件將在下載時使用的文件名
    
    fetch(fileURL)
        .then(response => {
            if (!response.ok) {
                throw new Error(`Server replied HTTP code: ${response.status}`);
            }
            return response.blob(); // 將響應轉換為 blob
        })
        .then(blob => {
            const link = document.createElement('a');
            link.href = window.URL.createObjectURL(blob);
            link.download = savePath; // 設置下載文件的名字
            document.body.appendChild(link); // 此步驟確保鏈接存在于文檔中
            link.click(); // 模擬點擊下載鏈接
            link.remove(); // 完成后移除鏈接
            console.log("Download completed!");
        })
        .catch(error => {
            console.error("Error during download:", error);
        });

    Android-Java

    import android.os.AsyncTask;
    import android.os.Environment;
    import java.io.BufferedInputStream;
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    
    public class DownloadTask extends AsyncTask<String, String, String> {
        @Override
        protected String doInBackground(String... params) {
            String fileURL = params[0];
            String savePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/myfile.txt"; // 修改后的保存路徑
            try {
                URL url = new URL(fileURL);
                HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
                httpConn.setRequestMethod("GET");
                int responseCode = httpConn.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    InputStream inputStream = new BufferedInputStream(httpConn.getInputStream());
                    FileOutputStream outputStream = new FileOutputStream(savePath);
                    byte[] buffer = new byte[4096];
                    int bytesRead;
                    while ((bytesRead = inputStream.read(buffer)) != -1) {
                        outputStream.write(buffer, 0, bytesRead);
                    }
                    outputStream.close();
                    inputStream.close();
                    return "Download completed!";
                } else {
                    return "No file to download. Server replied HTTP code: " + responseCode;
                }
            } catch (Exception e) {
                return "Error during download: " + e.getMessage();
            }
        }
    }

    Objective-C

    #import <Foundation/Foundation.h>
    
    int main(int argc, const char * argv[]) {
        @autoreleasepool {
            // 定義文件 URL 和保存路徑(修改為有效的路徑)
            NSString *fileURL = @"https://examplebucket.oss-cn-hangzhou.aliyuncs.com/exampleobject.txt?x-oss-date=20241112T092756Z&x-oss-expires=3599&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=LTAI5************/20241112/cn-hangzhou/oss/aliyun_v4_request&x-oss-signature=ed5a939feb8d79a389572719f7e2939939936d0**********";
            NSString *savePath = @"/Users/your_username/Desktop/myfile.txt"; // 請替換為您的用戶名
            
            // 創建 URL 對象
            NSURL *url = [NSURL URLWithString:fileURL];
            
            // 創建下載任務
            NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                // 錯誤處理
                if (error) {
                    NSLog(@"Error during download: %@", error.localizedDescription);
                    return;
                }
                
                // 檢查數據
                if (!data) {
                    NSLog(@"No data received.");
                    return;
                }
                
                // 保存文件
                NSError *writeError = nil;
                BOOL success = [data writeToURL:[NSURL fileURLWithPath:savePath] options:NSDataWritingAtomic error:&writeError];
                if (success) {
                    NSLog(@"Download completed!");
                } else {
                    NSLog(@"Error saving file: %@", writeError.localizedDescription);
                }
            }];
            
            // 啟動任務
            [task resume];
            
            // 讓主線程繼續運行以便異步請求能夠完成
            [[NSRunLoop currentRunLoop] run];
        }
        return 0;
    }

其他場景

生成帶versionId的簽名URL

以下代碼用于生成帶versionId的簽名URL。

<?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;

// 從環境變量中獲取訪問憑證。運行本代碼示例之前,請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
$accessKeyId = getenv("OSS_ACCESS_KEY_ID");
$accessKeySecret = getenv("OSS_ACCESS_KEY_SECRET");
// yourEndpoint填寫Bucket所在地域對應的Endpoint。以華東1(杭州)為例,Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。
$endpoint = "yourEndpoint";
// 填寫Bucket名稱。
$bucket= "examplebucket";
// 填寫不包含Bucket名稱在內的Object完整路徑。
$object = "exampleobject.txt";
// 指定簽名URL的過期時間為600s(最長可達32400s)。
$timeout = 600;
try{
  $ossClient = new OssClient($accessKeyId, $accessKeySecret, $endpoint);
  $options = array(
      // 填寫Object的versionId。
      $ossClient::OSS_VERSION_ID=>"CAEQEhiBgIDmgPf8mxgiIDA1YjZlNDIxY2ZmMzQ1MmU5MTM1Y2M4Yzk4NjIx****"
  );
  // 生成簽名URL。
  $signedUrl = $ossClient->signUrl($bucket, $object, $timeout, "GET", $options);
  printf('Sign Url:'.$signedUrl. "\n");
} catch(OssException $e) {
  printf($e->getMessage() . "\n");
}

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