C# 直接使用HTTP访问阿里云OSS

前言

    相信大家在使用阿里云OSS进行文件上传到时候，基本都是直接采用了阿里云提供的SDK；嗯，确实是简单方便，而且提供了各种语言、各种版本。但是偶尔会涉及到一些小众语言或者不方便集成SDK的项目，所以就需要直接采用Http进行上传。以下示例采用C#语言实现，若有其他语言参考即可：

开发环境：.NET Framework版本：4.8

开发工具：Visual Studio 2022

 

实现步骤

1. 定义OSS的基础信息

  readonly string endpoint = "";  readonly string accessKeyId = "";  readonly string accessKeySecret = "";  readonly string bucketName = "";

2. 参数加密算法

  private string HmacSha1(string data)  {      var hmacsha1 = new HMACSHA1(Encoding.UTF8.GetBytes(accessKeySecret));      var dataBuffer = Encoding.UTF8.GetBytes(data);      var hashBytes = hmacsha1.ComputeHash(dataBuffer);      return Convert.ToBase64String(hashBytes);  }

3. 对数据进行签名

private string Sign(string uploadName){    string data = $"PUT\n\ntext/plain\n{DateTime.Now.ToUniversalTime().ToString("r")}/{bucketName}/{uploadName}";    return HmacSha1(data);}

4. 上传调用

        public async Task<string> Upload()        {            string uploadName = "test/123.txt";            string uploadPath = "d:\\123.txt";
            string sign = Sign(uploadName);            string authorization = "OSS " + accessKeyId + ":" + sign;            HttpClient client = new HttpClient();            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Authorization", authorization);            byte[] bytes = System.IO.File.ReadAllBytes(uploadPath);            HttpContent content = new ByteArrayContent(bytes);            content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("text/plain");            var res = client.PutAsync(bucketEndpoint + uploadName, content).Result;            string result = await res.Content.ReadAsStringAsync();            return result;        }

5. 若以上基础信息放在前端怕被暴露，可考虑将签名封装为接口供前端调用或者做中转调用(浪费资源)。 

 

实现效果

 

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