C# Sample for Rackspace Email & Apps REST API

Here is working version of C# Sample for the Rackspace Email & Apps REST API. I had to make a couple of tweaks to the original original to get it to work. One of the easiest ways to work with the API is to fire it up in LINQPad. This can also be used in PowerShell via the Add-Type functionality.

//using System;
//using System.Collections.Specialized;
//using System.Security.Cryptography;
//using System.Text;
//using System.Net;
static void Main()
{
    // see: http://api-wiki.apps.rackspace.com/api-wiki/index.php/Main_Page
    var apiKey = "";
    var secretKey = "";
    var wm = new WebMethods(new System.Net.WebClient(), "https://api.emailsrvr.com/v0/", apiKey, secretKey);
    Console.Write(wm.Get("domains")); // Get list of Domains
    Console.Write(wm.Get("domains/example.com")); // Get summary of services in Domain
    Console.Write(wm.Get("domains/example.com/ex/mailboxes")); // Get Rackpsace Email Mailboxes for Domain
    Console.Write(wm.Get("domains/example.com/rs/mailboxes")); // Get Microsoft Exchange Mailboxes for Domain
}
public class WebMethods
{
    private WebClient client;
    private string baseUrl;
    private string apiKey;
    private string secretKey;
    private string format;

    public WebMethods(WebClient client, string baseUrl, string apiKey, string secretKey, string format = "text/xml")
    {
        this.client = client;
        this.baseUrl = baseUrl;
        this.apiKey = apiKey;
        this.secretKey = secretKey;
        this.format = format;
    }

    public virtual string Get(string url)
    {
        return MakeRemoteCall((client) =>
        {
            return client.DownloadString(baseUrl + url);
        },
        format);
    }

    public virtual string Post(string url, System.Collections.Specialized.NameValueCollection data)
    {
        return MakeRemoteCall((client) =>
        {
            var bytes = client.UploadValues(baseUrl + url, data);
            return Encoding.UTF8.GetString(bytes);
        },
        format);
    }

    private void SignMessage()
    {
        var userAgent = "C# Client Library";
        client.Headers["User-Agent"] = userAgent;

        var dateTime = DateTime.UtcNow.ToString("yyyyMMddHHmmss");

        var dataToSign = apiKey + userAgent + dateTime + secretKey;
        var hash = System.Security.Cryptography.SHA1.Create();
        var signedBytes = hash.ComputeHash(Encoding.UTF8.GetBytes(dataToSign));
        var signature = Convert.ToBase64String(signedBytes);

        client.Headers["X-Api-Signature"] = apiKey + ":" + dateTime + ":" + signature;
    }

    private void AssignFormat(string format)
    {
        client.Headers["Accept"] = format;
    }

    private string MakeRemoteCall(Func remoteCall, string format)
    {
        SignMessage();
        AssignFormat(format);
        return remoteCall.Invoke(client);
    }
}