Zeep Mobile: SMS with Ads

I recently started working on integrating Zeep Mobile into an app. The documentation provided by Zeep is not the best or accurate but they do provide source code examples in…python, pearl, java. I asked about c# and the response was “i’m sure someone has posted something, search the group”. Well, no-one posted a solution so I went about coding and iteratively developing the code to send an SMS. Running into an issue, I even tried StackOverflow but that wasn’t too helpful either.

Well I finally managed to get my code working. Here is some sample c# code to send messages using the zeep framework.

I hope you all looking for c# code find this helpful.

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Net.Security;
using System.Web;
using System.Web.Handlers;
using System.IO;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;


namespace ConsoleApplication1
{
    class Program
    {
        public static string API_KEY = "YOUR_API_KEY_GOES_HERE! INCLUDE DASHES!";
        public static string SECRET_ACCESS_KEY = "YOUR_SECRET_KEY_GOES_HERE!";

        static void Main(string[] args)
        {
            Console.WriteLine("BLAST - \r\n\r\n");
            BlastTcpPost();

            Console.WriteLine("SEND - \r\n\r\n");
            SendTcpPost();
        }

        /// <summary>
        /// Send a BLAST to all users in your ZEEP account.
        /// </summary>
        public static void BlastTcpPost()
        {
            SendSMS(
                "https://api.zeepmobile.com/messaging/2008-07-14/blast_message",    // URL for Send_Message 
                "You are on blast",                                                 // Message to send
                string.Empty                                                        // No UserId to send.
                );
        }

        /// <summary>
        /// Send a single message to a user in your ZEEP account.
        /// </summary>
        public static void SendTcpPost()
        {
            // Note:- 22 I use for the UserId is just a user I have signed up. Yours may be different and you 
            // might want to pass that in as a parameter.

            SendSMS(
                "https://api.zeepmobile.com/messaging/2008-07-14/send_message",     // URL for Send_Message
                "You are a user...good job!",                                       // Message to send
                "22"                                                                // User Id in your system.
                );

        }

        /// <summary>
        /// Uses a TCPClient and SSLStream to perform a POST.
        /// </summary>
        /// <param name="requestUrl">URL that the POST must be directed to.</param>
        /// <param name="body">Message that is to be sent.</param>
        /// <param name="user">UserId in your Zeep System. Only required if your sending a Single Message to a User. 
        /// Otherwise, just send a string.Empty.</param>
        /// <returns>Response from the server. (although it will write the response to console)</returns>
        public static string SendSMS(string requestUrl, string body, string user)
        {
            string parameters = "";
            string requestHeaders = "";
            string responseData = "";

            // FORMAT must be Sun, 06 Nov 1994 08:49:37 GMT
            string http_date = DateTime.UtcNow.ToString("r");

            // Clean the text to send
            body = HttpUtility.UrlEncode(body, System.Text.Encoding.UTF8);

            if (user.Length > 0) parameters += "user_id=" + user + "&";
            if (body.Length > 0) parameters += "body=" + body;


            // String that will be converted into a signature.
            string canonicalString = API_KEY + http_date + parameters;


            //------------START HASH COMPUTATION---------------------
            // Compute the Base64 HMACSHA1 value
            HMACSHA1 hmacsha1 = new HMACSHA1(SECRET_ACCESS_KEY.ToByteArray());

            // Compute the hash of the input file.
            byte[] hashValue = hmacsha1.ComputeHash(canonicalString.ToByteArray());

            String b64Mac = hashValue.ToBase64String();
            String authentication = String.Format("Zeep {0}:{1}", API_KEY, b64Mac);
            //-----------END HASH COMPUTATION------------------------


            string auth = String.Format("Zeep {0}:{1}", API_KEY, b64Mac);


            System.Uri uri = new Uri(requestUrl);
            System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient(uri.Host, uri.Port);
            string requestMethod = "POST " + uri.LocalPath + " HTTP/1.1\r\n";

            // Set Headers for the POST message
            requestHeaders += "Host: api.zeepmobile.com\r\n";
            requestHeaders += "Authorization: " + auth + "\r\n";
            requestHeaders += "Date: " + http_date + "\r\n";
            requestHeaders += "Content-Type: application/x-www-form-urlencoded\r\n";
            requestHeaders += "Content-Length: " + parameters.ToByteArray().Length + "\r\n";
            requestHeaders += "\r\n";


            // Get the data to be sent as a byte array.
            Byte[] data = System.Text.Encoding.UTF8.GetBytes(requestMethod + requestHeaders + parameters + "\r\n");
            // Send the message to the connected TcpServer.
            NetworkStream stream = client.GetStream();


            // SSL Authentication is used because the Server requires https.
            System.Net.Security.SslStream sslStream = new System.Net.Security.SslStream(
                stream,
                false,
                new System.Net.Security.RemoteCertificateValidationCallback(ValidateServerCertificate));
            sslStream.AuthenticateAsClient(uri.Host);

            // Send the data over the SSL stream.
            sslStream.Write(data, 0, data.Length);
            sslStream.Flush();


            // Receive the TcpServer.response.
            for (int i = 0; i < 100; i++)
            {
                if (stream.DataAvailable)
                {
                    break;
                }
                System.Threading.Thread.Sleep(100);
            }

            Byte[] bytes = new byte[1024];
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            while (stream.DataAvailable)
            {
                int count = sslStream.Read(bytes, 0, 1024);
                if (count == 0)
                {
                    break;
                }
                sb.Append(System.Text.Encoding.UTF8.GetString(bytes, 0, count));
            }

            responseData = sb.ToString();
            Console.WriteLine(responseData);
            // Close everything.
            client.Close();

            return responseData;
        }



        // The following method is invoked by the RemoteCertificateValidationDelegate.
        // We want to make sure the SSL has no Policy errors and is safe.
        public static bool ValidateServerCertificate(
              object sender,
              X509Certificate certificate,
              X509Chain chain,
              SslPolicyErrors sslPolicyErrors)
        {
            // Somehow the cert always has PolicyErrors so I am returning true regardless.
            return true;
            //if (sslPolicyErrors == SslPolicyErrors.None)
            //    return true;

            //Console.WriteLine("Certificate error: {0}", sslPolicyErrors);

            //// Do not allow this client to communicate with unauthenticated servers.
            //return false;
        }
    }

    public static class Extensions
    {
        public static byte[] ToByteArray(this string input)
        {
            UTF8Encoding encoding = new UTF8Encoding();
            return encoding.GetBytes(input);
        }

        public static string ToBase64String(this byte[] input)
        {
            return Convert.ToBase64String(input);
        }
    }
}