C# 调用unicloud

UniCloud 是一种基于云计算的云存储服务，您可以使用 C# 通过 HTTP 请求调用 UniCloud API 实现云存储的相关操作。以下是使用 C# 调用 UniCloud 的简单示例：

using System;
using System.IO;
using System.Net;
using System.Text;

public class UniCloudClient
{
    private string AccessKey;
    private string SecretKey;

    public UniCloudClient(string accessKey, string secretKey)
    {
        this.AccessKey = accessKey;
        this.SecretKey = secretKey;
    }

    private string GetAuthorization(string method, string path, string date)
    {
        string signStr = string.Format("{0}\n\n\n{1}\n{2}", method, date, path);
        byte[] signBytes = Encoding.UTF8.GetBytes(signStr);
        byte[] keyBytes = Encoding.UTF8.GetBytes(SecretKey);
        var hmac = new System.Security.Cryptography.HMACSHA1(keyBytes);
        byte[] hashBytes = hmac.ComputeHash(signBytes);
        return "UNICLOUD " + AccessKey + ":" + Convert.ToBase64String(hashBytes);
    }

    private HttpWebRequest CreateRequest(string method, string url)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = method;
        request.Headers.Add("X-UniCloud-Date", DateTime.UtcNow.ToString("r"));
        request.Headers.Add("Authorization", GetAuthorization(method, request.RequestUri.PathAndQuery, request.Headers["X-UniCloud-Date"]));
        return request;
    }

    public string UploadFile(string bucketName, string objectKey, string filePath)
    {
        string url = string.Format("https://{0}.unicloudsrv.com/{1}", bucketName, objectKey);
        HttpWebRequest request = CreateRequest("PUT", url);
        using (Stream requestStream = request.GetRequestStream())
        {
            using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
            {
                byte[] buffer = new byte[8192];
                int bytesRead;
                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    requestStream.Write(buffer, 0, bytesRead);
                }
            }
        }
        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        {
            return response.Headers["ETag"];
        }
    }

    public void DownloadFile(string bucketName, string objectKey, string filePath)
    {
        string url = string.Format("https://{0}.unicloudsrv.com/{1}", bucketName, objectKey);
        HttpWebRequest request = CreateRequest("GET", url);
        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        {
            using (Stream responseStream = response.GetResponseStream())
            {
                using (FileStream fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
                {
                    byte[] buffer = new byte[8192];
                    int bytesRead;
                    while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        fileStream.Write(buffer, 0, bytesRead);
                    }
                }
            }
        }
    }
}

在上面的代码中，UniCloudClient 类封装了调用 UniCloud API 的相关方法，其中 UploadFile 方法可以将本地文件上传到 UniCloud 云存储中，DownloadFile 方法可以将 UniCloud 中的文件下载到本地文件系统中。

你需要将代码中的 AccessKey 和 SecretKey 替换为你自己的 UniCloud 访问密钥，同时还需要根据具体的业务需求修改代码中的 bucketName、objectKey 和 filePath 等参数。