预签名的 URL（.NET SDK）--对象存储-火山引擎

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预签名的 URL（.NET SDK）

TosClient 在向服务端发起请求时，默认会对请求 header 里包含签名。SDK 也支持构造带签名的 URL，用户可直接使用该 URL 发起 HTTP 请求，也可以将该 URL 共享给第三方实现访问授权。本文介绍预签名 URL 的 SDK 示例。

使用预签名 URL 上传对象

以下代码用于生成预签名的 URL，然后使用预签名的 URL 向指定桶中上传对象。

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using TOS;
using TOS.Error;
using TOS.Model;

namespace ConsoleApp
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
            var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
            // endpoint 若没有指定HTTP协议（HTTP/HTTPS），默认使用 HTTPS
            // Bucket 的 Endpoint，以华北2（北京）为例：https://tos-cn-beijing.volces.com
            var endpoint = "https://tos-cn-beijing.volces.com";
            var region = "cn-beijing";
            // 填写 BucketName
            var bucketName = "*** Provide your bucket name ***";
            // 填写对象名
            var objectKey = "*** Provide your object key ***";
            var data = "Hello TOS";

            // 创建TOSClient实例
            var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();

            try
            {
                var preSignedURLInput = new PreSignedURLInput()
                {
                    Bucket = bucketName,
                    Key = objectKey,
                    HttpMethod = HttpMethodType.HttpMethodPut,
                    Header = new Dictionary<string, string>() { { "Content-Type", "text/plain" } }
                };
                var preSignedURLOutput = client.PreSignedURL(preSignedURLInput);

                // 上传对象
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(preSignedURLOutput.SignedUrl);
                request.Method = WebRequestMethods.Http.Put;
                var body = System.Text.Encoding.UTF8.GetBytes(data);
                request.ContentLength = data.Length;
                request.ContentType = "text/plain";
                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(body, 0, data.Length);
                }

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Console.WriteLine("PreSignedURL Put Object Status Code {0}", response.StatusCode);
                response.Close();
            }
            catch (TosServerException ex)
            {
                Console.WriteLine("PreSignedURL failed, Request ID {0}", ex.RequestID);
                Console.WriteLine("PreSignedURL failed, Status Code {0}", ex.StatusCode);
                Console.WriteLine("PreSignedURL failed, Response Error Code {0}", ex.Code);
                Console.WriteLine("PreSignedURL failed, Response Error Message {0}", ex.Message);
            }
            catch (TosClientException ex)
            {
                Console.WriteLine("PreSignedURL failed, Error Message {0}", ex.Message);
            }
            catch (Exception ex)
            {
                Console.WriteLine("PreSignedURL failed, {0}", ex.Message);
            }
        }
    }
}

使用预签名的 URL 下载对象

以下代码用于生成预签名的 URL ，然后使用预签名的 URL 向指定桶中下载对象。

using System;
using System.Net;
using TOS;
using TOS.Error;
using TOS.Model;

namespace ConsoleApp
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
            var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
            // endpoint 若没有指定HTTP协议（HTTP/HTTPS），默认使用 HTTPS
            // Bucket 的 Endpoint，以华北2（北京）为例：https://tos-cn-beijing.volces.com
            var endpoint = "https://tos-cn-beijing.volces.com";
            var region = "cn-beijing";
            // 填写 BucketName
            var bucketName = "*** Provide your bucket name ***";
            // 填写对象名
            var objectKey = "*** Provide your object key ***";
            var data = "Hello TOS";

            // 创建TOSClient实例
            var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();

            try
            {
                var preSignedURLInput = new PreSignedURLInput()
                {
                    Bucket = bucketName,
                    Key = objectKey,
                    HttpMethod = HttpMethodType.HttpMethodGet,
                };
                var preSignedURLOutput = client.PreSignedURL(preSignedURLInput);

                // 获取对象
                var request = (HttpWebRequest)WebRequest.Create(preSignedURLOutput.SignedUrl);
                request.Method = WebRequestMethods.Http.Get;
                var response = (HttpWebResponse)request.GetResponse();
                Console.WriteLine("PreSignedURL Get Object Status Code {0}", response.StatusCode);
                response.Close();
            }
            catch (TosServerException ex)
            {
                Console.WriteLine("PreSignedURL failed, Request ID {0}", ex.RequestID);
                Console.WriteLine("PreSignedURL failed, Status Code {0}", ex.StatusCode);
                Console.WriteLine("PreSignedURL failed, Response Error Code {0}", ex.Code);
                Console.WriteLine("PreSignedURL failed, Response Error Message {0}", ex.Message);
            }
            catch (TosClientException ex)
            {
                Console.WriteLine("PreSignedURL failed, Error Message {0}", ex.Message);
            }
            catch (Exception ex)
            {
                Console.WriteLine("PreSignedURL failed, {0}", ex.Message);
            }
        }
    }
}

使用预签名的 URL 删除对象

以下代码用于生成预签名的 URL，然后使用预签名的 URL 在指定桶中删除对象。

using System;
using System.Net;
using TOS;
using TOS.Error;
using TOS.Model;

namespace ConsoleApp
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
            var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
            // endpoint 若没有指定HTTP协议（HTTP/HTTPS），默认使用 HTTPS
            // Bucket 的 Endpoint，以华北2（北京）为例：https://tos-cn-beijing.volces.com
            var endpoint = "https://tos-cn-beijing.volces.com";
            var region = "cn-beijing";
            // 填写 BucketName
            var bucketName = "*** Provide your bucket name ***";
            // 填写对象名
            var objectKey = "*** Provide your object key ***";
            var data = "Hello TOS";

            // 创建TOSClient实例
            var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();

            try
            {
                var preSignedURLInput = new PreSignedURLInput()
                {
                    Bucket = bucketName,
                    Key = objectKey,
                    HttpMethod = HttpMethodType.HttpMethodDelete,
                };
                var preSignedURLOutput = client.PreSignedURL(preSignedURLInput);

                // 删除对象
                var request = (HttpWebRequest)WebRequest.Create(preSignedURLOutput.SignedUrl);
                request.Method = "DELETE";
                var response = (HttpWebResponse)request.GetResponse();
                Console.WriteLine("PreSignedURL Delete Object Status Code {0}", response.StatusCode);
                response.Close();
            }
            catch (TosServerException ex)
            {
                Console.WriteLine("PreSignedURL failed, Request ID {0}", ex.RequestID);
                Console.WriteLine("PreSignedURL failed, Status Code {0}", ex.StatusCode);
                Console.WriteLine("PreSignedURL failed, Response Error Code {0}", ex.Code);
                Console.WriteLine("PreSignedURL failed, Response Error Message {0}", ex.Message);
            }
            catch (TosClientException ex)
            {
                Console.WriteLine("PreSignedURL failed, Error Message {0}", ex.Message);
            }
            catch (Exception ex)
            {
                Console.WriteLine("PreSignedURL failed, {0}", ex.Message);
            }
        }
    }
}

对象存储

使用预签名 URL 上传对象

使用预签名的 URL 下载对象

使用预签名的 URL 删除对象

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