Azure REST API (2) Azure Storage

　　《Windows Azure Platform 系列文章目录》

　　注意：本文适用于国内由世纪互联运维的Azure China。

　　本文将会介绍如何使用REST API来直接访问Storage Service。

　　项目文件在这里下载

　　1.首先我们以管理员身份，创建一个Windows Console项目

　　2.在Program.cs中，增加如下代码

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace AzureStorageRestAPI
{
    class Program
    {

        internal class CanonicalizedString
        {

            private StringBuilder canonicalizedString = new StringBuilder();

            internal CanonicalizedString(string initialElement)
            {

                this.canonicalizedString.Append(initialElement);
            }


            internal void AppendCanonicalizedElement(string element)
            {

                this.canonicalizedString.Append("
");
                this.canonicalizedString.Append(element);
            }

            internal string Value
            {
                get
                {
                    return this.canonicalizedString.ToString();

                }
            }

        }

        const string bloburi = @"https://leidemo.blob.core.chinacloudapi.cn";
        const string accountname = "leidemo";
        const string key = "EZNbnhPJ7+Fv6X5k9OW36ece5WflDJaUvGjdVpdwxEXsKVzEa18/Rw2f30d6ASELNYE7XlvFs78nfCw+UIs3kQ==";
        const string method = "GET";

        static void Main(string[] args)
        {
            string AccountName = accountname;
            string AccountSharedKey = key;
            string Address = bloburi;
            string container = "public";


            // 创建请求字符串
            string QueryString = "?restype=container&comp=list";
            Uri requesturi = new Uri(Address + "/" + container + QueryString);
            string MessageSignature = "";



            // 创建HttpWebRequest类

            HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(requesturi.AbsoluteUri);

            Request.Method = method;

            Request.ContentLength = 0;

            Request.Headers.Add("x-ms-date", DateTime.UtcNow.ToString("R"));

            Request.Headers.Add("x-ms-version", "2009-09-19");



            // 开始创建签名

            MessageSignature += "GET
"; // Verb

            MessageSignature += "
"; // Content-Encoding

            MessageSignature += "
"; // Content-Language

            MessageSignature += "
"; // Content-Length

            MessageSignature += "
"; // Content-MD5

            MessageSignature += "
"; // Content-Type

            MessageSignature += "
"; // Date

            MessageSignature += "
"; // If-Modified-Since

            MessageSignature += "
"; // If-Match

            MessageSignature += "
"; // If-None-Match

            MessageSignature += "
"; // If-Unmodified-Since

            MessageSignature += "
"; // Range



            // CanonicalizedHeaders

            ArrayList list = new ArrayList();

            foreach (string str in Request.Headers.Keys)
            {

                if (str.ToLowerInvariant().StartsWith("x-ms-", StringComparison.Ordinal))
                {

                    list.Add(str.ToLowerInvariant());

                }

            }

            list.Sort();

            foreach (string str2 in list)
            {

                StringBuilder builder = new StringBuilder(str2);

                string str3 = ":";

                foreach (string str4 in GetHeaderValues(Request.Headers, str2))
                {

                    string str5 = str4.Replace("
", string.Empty);

                    builder.Append(str3);

                    builder.Append(str5);

                    str3 = ",";

                }

                MessageSignature += builder.ToString() + "
";

            }

            MessageSignature += GetCanonicalizedResourceVersion2(requesturi, AccountName);



            // 开始创建签名

            byte[] SignatureBytes = System.Text.Encoding.UTF8.GetBytes(MessageSignature);

            System.Security.Cryptography.HMACSHA256 SHA256 = new System.Security.Cryptography.HMACSHA256(Convert.FromBase64String(AccountSharedKey));



            // 创建Authorization HTTP消息头的值

            String AuthorizationHeader = "SharedKey " + AccountName + ":" + Convert.ToBase64String(SHA256.ComputeHash(SignatureBytes));



            // 把编码后的签名加入到Authorization HTTP消息头中

            Request.Headers.Add("Authorization", AuthorizationHeader);



            // 获取返回消息

            using (HttpWebResponse response = (HttpWebResponse)Request.GetResponse())
            {

                if (response.StatusCode == HttpStatusCode.OK)
                {

                    // 服务器返回成功消息

                    using (Stream stream = response.GetResponseStream())
                    {

                        using (StreamReader sr = new StreamReader(stream))
                        {



                            var s = sr.ReadToEnd();

                            // 输出返回消息

                            Console.WriteLine(s);

                        }



                    }

                }

                else
                {

                    // 这里可以抛出异常信息

                }

            }

            Console.ReadLine();

        }


        static ArrayList GetHeaderValues(NameValueCollection headers, string headerName)
        {

            ArrayList list = new ArrayList();

            string[] values = headers.GetValues(headerName);

            if (values != null)
            {

                foreach (string str in values)
                {

                    list.Add(str.TrimStart(new char[0]));

                }

            }

            return list;

        }



        static string GetCanonicalizedResourceVersion2(Uri address, string accountName)
        {

            StringBuilder builder = new StringBuilder("/");

            builder.Append(accountName);

            builder.Append(address.AbsolutePath);

            CanonicalizedString str = new CanonicalizedString(builder.ToString());

            NameValueCollection values = HttpUtility.ParseQueryString(address.Query);

            NameValueCollection values2 = new NameValueCollection();

            foreach (string str2 in values.Keys)
            {

                ArrayList list = new ArrayList(values.GetValues(str2));

                list.Sort();

                StringBuilder builder2 = new StringBuilder();

                foreach (object obj2 in list)
                {

                    if (builder2.Length > 0)
                    {

                        builder2.Append(",");

                    }

                    builder2.Append(obj2.ToString());

                }

                values2.Add((str2 == null) ? str2 : str2.ToLowerInvariant(), builder2.ToString());

            }

            ArrayList list2 = new ArrayList(values2.AllKeys);

            list2.Sort();

            foreach (string str3 in list2)
            {

                StringBuilder builder3 = new StringBuilder(string.Empty);

                builder3.Append(str3);

                builder3.Append(":");

                builder3.Append(values2[str3]);

                str.AppendCanonicalizedElement(builder3.ToString());

            }

            return str.Value;

        }

    }
}

　　

　　3.在调试项目的时候，注意修改以下参数：

　　const string bloburi = @"https://leidemo.blob.core.chinacloudapi.cn";  　　　　　//修改为Storage Endpoint

　　const string accountname = "leidemo";  　　　　　　　　　　　　　　　　　　　　 //修改为你的存储账号名称

　　const string key = "[YourStorageAccountKey]";   　　　　　　　　　　　　　　　　//修改为你的存储账号Key

　　string container = "public";      　　　　　　　　  　　　　　　　　　　　　　　　　//修改为存储账号的Container Name        

　　4.运行成功，你将会看到Console程序输出如下信息，内容为名为存储账号leidemo，Container为public中所有Blob的信息：

　　参考资料:http://blogs.msdn.com/b/azchina/archive/2010/03/19/windows-azure-rest-api-storage-service.aspx