t2-support-gists/Default.aspx

## README.txt
******************************************************************************************
* Licensed by AT&T under 'Software Development Kit Tools Agreement.' 2013
* Copyright 2013 AT&T Intellectual Property. All rights reserved. http://developer.att.com
* For more information contact developer.support@att.com<mailto:developer.support@att.com>
******************************************************************************************

  AT&T API Samples - Text To Speech app 1
 --------------------------------

This application allows the user to send an audio file for text to speech,
and get the transcribed text.

This file describes how to set up, configure and run the C# Applications of the
AT&T .Net Restful sample applications.
It covers all steps required to register the application on developer site and, based
on the generated API keys and secrets, create and run one's own full-fledged
sample applications.

  1. Configuration
  2. Installation
  3. Parameters
  4. Running the application


1. Configuration

  Configuration consists of a few steps necessary to get an application registered
  on developer site with the proper services and endpoints, depending on the type of
  client-side application (autonomous/non-autonomous).

  To register an application, go to https://developer.att.com/ and login with
  your valid username and password. Next, choose "My Apps" from the bar at the top
  of the page and click the "Setup a New Application" button.

  Fill in the form, in particular all fields marked as "required".

NOTE: You MUST select Text To Speech in the list of services under field 'Services' in
order to use this sample application code.

  Having your application registered, you will get back an important pair of data:
  an API key and Secret key. They are necessary to get your applications working
  with the AT&T Platform APIs.

  Initially your newly registered application is restricted to the "Sandbox"
  environment only. To move it to production, you may promote it by clicking the
  "Promote to production" button. Notice that you will get a different API key and
   secret, so these values in your application should be adjusted accordingly.

  Depending on the kind of authentication used, an application may be based on
  either the Autonomous Client or the Web-Server Client OAuth flow.


2. Installation

** Requirements

   To run the examples you need an IIS Server.

   Download the application files from the download link published in AT&T portal
   into webdomain of your IIS server.


3. Parameters

  Each sample application contains an web.config file. This file
  is located in the 'app' folder. This file holds configurable
  parameters described in an easy-to-read format. Please modify the
  web.config file using the comments specified within the file.

  Note: If your application is promoted from Sandbox environment to Production
  environment and you decide to use production application settings, you must
  update parameters as per production application details.


4. Running the application

Suppose you copied the sample app files in your IIS server webroot/texttospeech/app1/ folder.
In order to run the sample application, type in'http://IIS_HOSTNAME:8080/texttospeech/app1/Default.aspx'
(assuming you're using a HOSTNAME machine with IIS Server and have not changed the
default port number, otherwise adjust accordingly) on your browser.

## Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="TTS_App1" %>

<!DOCTYPE html>
<!--
Licensed by AT&T under 'Software Development Kit Tools Agreement.' 2013
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION: http://developer.att.com/sdk_agreement/
Copyright 2013 AT&T Intellectual Property. All rights reserved. http://developer.att.com
For more information contact developer.support@att.com
-->
<!--[if lt IE 7]> <html class="ie6" lang="en"> <![endif]-->
<!--[if IE 7]>    <html class="ie7" lang="en"> <![endif]-->
<!--[if IE 8]>    <html class="ie8" lang="en"> <![endif]-->
<!--[if gt IE 8]><!-->
<html lang="en">
<!--<![endif]-->
<head>
    <title>AT&amp;T Sample Speech Application - Text To Speech </title>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
    <meta id="viewport" name="viewport" content="width=device-width,minimum-scale=1,maximum-scale=1" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
    <link rel="stylesheet" type="text/css" href="style/common.css" />
    <script type="text/javascript">
        var _gaq = _gaq || [];
        _gaq.push(['_setAccount', 'UA-33466541-1']);
        _gaq.push(['_trackPageview']);

        (function () {
            var ga = document.createElement('script');
            ga.type = 'text/javascript';
            ga.async = true;
            ga.src = ('https:' == document.location.protocol ? 'https://ssl'
                                      : 'http://www')
                                      + '.google-analytics.com/ga.js';
            var s = document.getElementsByTagName('script')[0];
            s.parentNode.insertBefore(ga, s);
        })();
    </script>
</head>
<body>
    <div id="pageContainer" class="pageContainer">
        <div id="header">
            <div class="logo" id="top">
            </div>
            <div id="menuButton" class="hide">
                <a id="jump" href="#nav">Main Navigation</a>
            </div>
            <ul class="links" id="nav">

                <li><a id="SourceLink" runat="server" target="_blank">Source<img src="images/source.png"
                    alt="" />
                </a><span class="divider">|&nbsp;</span> </li>
                <li><a id="DownloadLink" runat="server" target="_blank">Download<img src="images/download.png"
                    alt="" />
                </a><span class="divider">|&nbsp;</span> </li>
                <li><a id="HelpLink" runat="server" target="_blank">Help </a></li>
                <li id="back"><a href="#top">Back to top</a></li>
            </ul>
        </div>
        <form id="form1" runat="server">
        <div class="content">
            <div class="contentHeading">
                <h1>
                    AT&amp;T Sample Application - Text To Speech</h1>
                <div id="introtext">
                    <div>
                        <b>Server Time:&nbsp;</b><%= String.Format("{0:ddd, MMMM dd, yyyy HH:mm:ss}", DateTime.UtcNow) + " UTC" %>
                    </div>
                    <div>
                        <b>Client Time:</b>
                        <script language="JavaScript" type="text/javascript">
                            var myDate = new Date();
                            document.write(myDate);
                        </script>
                    </div>
                    <div>
                        <b>User Agent:</b>
                        <script language="JavaScript" type="text/javascript">
                            document.write("" + navigator.userAgent);
                        </script>
                    </div>
                </div>
            </div>
            <div class="formBox" id="formBox">
                <div id="formContainer" class="formContainer">
                    <div id="formData">
                        <h3>
                            Content Type:
                        </h3>
                        <asp:DropDownList ID="ContentType" name="ContentType" runat="server">
                            <asp:ListItem value="text/plain" Selected="True" Text="text/plain" />
                            <asp:ListItem value="application/ssml+xml" Text="application/ssml+xml" />
                        </asp:DropDownList>
                        <h3>Content:</h3>
                          <label>text/plain</label><br/>
                          <asp:TextBox ID="plaintext" type="text" runat="server" name="plaintext" TextMode="MultiLine" Enabled="False" Rows="4"></asp:TextBox><br/>
                          <label>application/ssml</label><br/>
                          <asp:TextBox  ID="ssml" type="text" runat="server" name="ssml" TextMode="MultiLine" Enabled="False" Rows="4"></asp:TextBox >
                        <h3>
                            X-Arg:
                        </h3>
                        <asp:TextBox ID="x_arg" runat="server" TextMode="MultiLine" type="text" Enabled="False" Rows="4"></asp:TextBox>
                        <br />
                        <button id="btnSubmit" onserverclick="BtnSubmit_Click" runat="server" name="TextToSpeechButton"
                            type="submit">
                            Submit</button>
                        <% if (!string.IsNullOrEmpty(TTSSuccessMessage)){%>
                        <div class="successWide" align="left">
                            <strong>SUCCESS:</strong>
                            <audio controls="controls" autobuffer="autobuffer" autoplay="autoplay" runat="server" id="audioPlay">
                            </audio>
                        </div>
                        <% } %>
                        <% if (!string.IsNullOrEmpty(TTSErrorMessage)){%>
                        <div class="errorWide">
                            <strong>ERROR:</strong>
                            <br>
                            <%= TTSErrorMessage%>
                        </div>
                        <% } %>
                    </div>
                </div>
            </div>
        </div>
        </form>
        <div id="footer">
            <div id="ft">
                <div id="powered_by">
                    Powered by AT&amp;T Cloud Architecture
                </div>
                <p>
                    The Application hosted on this site are working examples intended to be used for
                    reference in creating products to consume AT&amp;T Services and not meant to be
                    used as part of your product. The data in these pages is for test purposes only
                    and intended only for use as a reference in how the services perform.
                    <br />
                    <br />
                    For download of tools and documentation, please go to <a href="https://developer.att.com/"
                        target="_blank">https://developer.att.com</a>
                    <br />
                    For more information contact <a href="mailto:developer.support@att.com">developer.support@att.com</a>
                    <br />
                    <br />
                    © 2014 AT&amp;T Intellectual Property. All rights reserved. <a href="https://developer.att.com/"
                        target="_blank">https://developer.att.com</a>
                </p>
            </div>
            <!-- end of ft -->
        </div>
        <!-- end of footer -->
    </div>
</body>
</html>

## Default.aspx.cs
// <copyright file="Default.aspx.cs" company="AT&amp;T">
// Licensed by AT&amp;T under 'Software Development Kit Tools Agreement.' 2013
// TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION: http://developer.att.com/sdk_agreement/
// Copyright 2013 AT&amp;T Intellectual Property. All rights reserved. http://developer.att.com
// For more information contact developer.support@att.com
// </copyright>

#region References

using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Web;
using System.Web.Script.Serialization;
using System.Web.UI.HtmlControls;


#endregion

/// <summary>
/// Speech application
/// </summary>
public partial class TTS_App1 : System.Web.UI.Page
{
    #region Class variables and Data structures
    /// <summary>
    /// Temporary variables for processing
    /// </summary>
    private string fqdn, accessTokenFilePath;

    /// <summary>
    /// Temporary variables for processing
    /// </summary>
    private string apiKey, secretKey, accessToken, scope, refreshToken, refreshTokenExpiryTime, accessTokenExpiryTime, bypassSSL;

    /// <summary>
    /// variable for having the posted file.
    /// </summary>
    private string TTSPlainText = string.Empty;
    private string TTSSSML = string.Empty;

    /// <summary>
    /// Gets or sets the value of refreshTokenExpiresIn
    /// </summary>
    private int refreshTokenExpiresIn;

    string xArgsData = string.Empty;

    public string TTSErrorMessage = string.Empty;
    public string TTSSuccessMessage = string.Empty;
    public byte[] receivedBytes = null;

    /// <summary>
    /// Access Token Types
    /// </summary>
    public enum AccessType
    {
        /// <summary>
        /// Access Token Type is based on Client Credential Mode
        /// </summary>
        ClientCredential,

        /// <summary>
        /// Access Token Type is based on Refresh Token
        /// </summary>
        RefreshToken
    }
    #endregion

    #region Events

    /// <summary>
    /// This function is called when the applicaiton page is loaded into the browser.
    /// This function reads the web.config and gets the values of the attributes
    /// </summary>
    /// <param name="sender">Button that caused this event</param>
    /// <param name="e">Event that invoked this function</param>
    protected void Page_Load(object sender, EventArgs e)
    {
        BypassCertificateError();

        this.ReadConfigFile();

        this.SetContent();
    }

    private void SetContent()
    {
        StreamReader streamReaderPlain = new StreamReader(this.TTSPlainText);
        plaintext.Text = streamReaderPlain.ReadToEnd();
        streamReaderPlain.Close();
        StreamReader streamReaderSSML = new StreamReader(this.TTSSSML);
        ssml.Text = streamReaderSSML.ReadToEnd();
        streamReaderSSML.Close();
    }

    /// <summary>
    /// Method that calls SpeechToText api when user clicked on submit button
    /// </summary>
    /// <param name="sender">sender that invoked this event</param>
    /// <param name="e">eventargs of the button</param>
    protected void BtnSubmit_Click(object sender, EventArgs e)
    {
        try
        {
            bool IsValid = true;

            IsValid = this.ReadAndGetAccessToken(ref TTSErrorMessage);
            if (IsValid == false)
            {
                TTSErrorMessage = "Unable to get access token";
                return;
            }
            string content = string.Empty;
            if (string.Compare(ContentType.SelectedValue, "text/plain") == 0)
            {
                content = plaintext.Text;
            }
            else
            {
                content = ssml.Text;
            }

            this.TextToSpeech(this.fqdn, "/speech/v3/textToSpeech", this.accessToken, x_arg.Text, ContentType.SelectedValue, content);
            /*
            this.ConvertToSpeech(this.fqdn + "/rest/2/SpeechToText",
                this.accessToken, SpeechContext.SelectedValue.ToString(), x_arg.Text, speechFile, chunkValue);
             */
        }
        catch (Exception ex)
        {
            TTSErrorMessage = ex.Message;
            return;
        }
    }

    #endregion

    #region Access Token Related Functions

    /// <summary>
    /// Read parameters from configuraton file
    /// </summary>
    /// <returns>true/false; true if all required parameters are specified, else false</returns>
    private bool ReadConfigFile()
    {
        this.accessTokenFilePath = ConfigurationManager.AppSettings["AccessTokenFilePath"];
        if (string.IsNullOrEmpty(this.accessTokenFilePath))
        {
            this.accessTokenFilePath = "~\\SpeechApp1AccessToken.txt";
        }

        this.fqdn = ConfigurationManager.AppSettings["FQDN"];
        if (string.IsNullOrEmpty(this.fqdn))
        {
            TTSErrorMessage = "FQDN is not defined in configuration file";
            return false;
        }

        this.apiKey = ConfigurationManager.AppSettings["api_key"];
        if (string.IsNullOrEmpty(this.apiKey))
        {
            TTSErrorMessage = "api_key is not defined in configuration file";
            return false;
        }

        this.secretKey = ConfigurationManager.AppSettings["secret_key"];
        if (string.IsNullOrEmpty(this.secretKey))
        {
            TTSErrorMessage = "secret_key is not defined in configuration file";
            return false;
        }

        this.scope = ConfigurationManager.AppSettings["scope"];
        if (string.IsNullOrEmpty(this.scope))
        {
            this.scope = "TTS";
        }

        string refreshTokenExpires = ConfigurationManager.AppSettings["refreshTokenExpiresIn"];
        if (!string.IsNullOrEmpty(refreshTokenExpires))
        {
            this.refreshTokenExpiresIn = Convert.ToInt32(refreshTokenExpires);
        }
        else
        {
            this.refreshTokenExpiresIn = 24;
        }
        if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["SourceLink"]))
        {
            SourceLink.HRef = ConfigurationManager.AppSettings["SourceLink"];
        }
        else
        {
            SourceLink.HRef = "#"; // Default value
        }

        if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["DownloadLink"]))
        {
            DownloadLink.HRef = ConfigurationManager.AppSettings["DownloadLink"];
        }
        else
        {
            DownloadLink.HRef = "#"; // Default value
        }

        if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["HelpLink"]))
        {
            HelpLink.HRef = ConfigurationManager.AppSettings["HelpLink"];
        }
        else
        {
            HelpLink.HRef = "#"; // Default value
        }

        if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["TTSPlainText"]))
        {
            this.TTSPlainText = Request.MapPath(ConfigurationManager.AppSettings["TTSPlainText"]);
        }

        if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["TTSSSML"]))
        {
            this.TTSSSML = Request.MapPath(ConfigurationManager.AppSettings["TTSSSML"]);
        }

        if (!IsPostBack)
        {
            if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["X-Arg"]))
            {
                xArgsData = HttpUtility.UrlEncode(ConfigurationManager.AppSettings["X-Arg"]);
                x_arg.Text = ConfigurationManager.AppSettings["X-Arg"];
            }
        }

        return true;
    }


    /// <summary>
    /// This function reads the Access Token File and stores the values of access token, expiry seconds
    /// refresh token, last access token time and refresh token expiry time
    /// This funciton returns true, if access token file and all others attributes read successfully otherwise returns false
    /// </summary>
    /// <param name="panelParam">Panel Details</param>
    /// <returns>Returns boolean</returns>
    private bool ReadAccessTokenFile(ref string message)
    {
        FileStream fileStream = null;
        StreamReader streamReader = null;
        try
        {
            fileStream = new FileStream(Request.MapPath(this.accessTokenFilePath), FileMode.OpenOrCreate, FileAccess.Read);
            streamReader = new StreamReader(fileStream);
            this.accessToken = streamReader.ReadLine();
            this.accessTokenExpiryTime = streamReader.ReadLine();
            this.refreshToken = streamReader.ReadLine();
            this.refreshTokenExpiryTime = streamReader.ReadLine();
        }
        catch (Exception ex)
        {
            message = ex.Message;
            return false;
        }
        finally
        {
            if (null != streamReader)
            {
                streamReader.Close();
            }

            if (null != fileStream)
            {
                fileStream.Close();
            }
        }

        if ((this.accessToken == null) || (this.accessTokenExpiryTime == null) || (this.refreshToken == null) || (this.refreshTokenExpiryTime == null))
        {
            return false;
        }

        return true;
    }

    /// <summary>
    /// This function validates the expiry of the access token and refresh token.
    /// function compares the current time with the refresh token taken time, if current time is greater then returns INVALID_REFRESH_TOKEN
    /// function compares the difference of last access token taken time and the current time with the expiry seconds, if its more, returns INVALID_ACCESS_TOKEN
    /// otherwise returns VALID_ACCESS_TOKEN
    /// </summary>
    /// <returns>string, which specifies the token validity</returns>
    private string IsTokenValid()
    {
        try
        {
            DateTime currentServerTime = DateTime.UtcNow.ToLocalTime();
            if (currentServerTime >= DateTime.Parse(this.accessTokenExpiryTime))
            {
                if (currentServerTime >= DateTime.Parse(this.refreshTokenExpiryTime))
                {
                    return "INVALID_ACCESS_TOKEN";
                }
                else
                {
                    return "REFRESH_TOKEN";
                }
            }
            else
            {
                return "VALID_ACCESS_TOKEN";
            }
        }
        catch
        {
            return "INVALID_ACCESS_TOKEN";
        }
    }

    /// <summary>
    /// This function get the access token based on the type parameter type values.
    /// If type value is 1, access token is fetch for client credential flow
    /// If type value is 2, access token is fetch for client credential flow based on the exisiting refresh token
    /// </summary>
    /// <param name="type">Type as integer</param>
    /// <param name="panelParam">Panel details</param>
    /// <returns>Return boolean</returns>
    private bool GetAccessToken(AccessType type, ref string message)
    {
        FileStream fileStream = null;
        Stream postStream = null;
        StreamWriter streamWriter = null;

        // This is client credential flow
        if (type == AccessType.ClientCredential)
        {
            try
            {
                DateTime currentServerTime = DateTime.UtcNow.ToLocalTime();

                WebRequest accessTokenRequest = System.Net.HttpWebRequest.Create(string.Empty + this.fqdn + "/oauth/v4/token");
                accessTokenRequest.Method = "POST";
                string oauthParameters = string.Empty;
                if (type == AccessType.ClientCredential)
                {
                    oauthParameters = "client_id=" + this.apiKey + "&client_secret=" + this.secretKey + "&grant_type=client_credentials&scope=" + this.scope;
                }
                else
                {
                    oauthParameters = "grant_type=refresh_token&client_id=" + this.apiKey + "&client_secret=" + this.secretKey + "&refresh_token=" + this.refreshToken;
                }

                accessTokenRequest.ContentType = "application/x-www-form-urlencoded";

                UTF8Encoding encoding = new UTF8Encoding();
                byte[] postBytes = encoding.GetBytes(oauthParameters);
                accessTokenRequest.ContentLength = postBytes.Length;

                postStream = accessTokenRequest.GetRequestStream();
                postStream.Write(postBytes, 0, postBytes.Length);

                WebResponse accessTokenResponse = accessTokenRequest.GetResponse();
                using (StreamReader accessTokenResponseStream = new StreamReader(accessTokenResponse.GetResponseStream()))
                {
                    string jsonAccessToken = accessTokenResponseStream.ReadToEnd().ToString();
                    JavaScriptSerializer deserializeJsonObject = new JavaScriptSerializer();

                    AccessTokenResponse deserializedJsonObj = (AccessTokenResponse)deserializeJsonObject.Deserialize(jsonAccessToken, typeof(AccessTokenResponse));

                    this.accessToken = deserializedJsonObj.access_token;
                    this.accessTokenExpiryTime = currentServerTime.AddSeconds(Convert.ToDouble(deserializedJsonObj.expires_in)).ToString();
                    this.refreshToken = deserializedJsonObj.refresh_token;

                    DateTime refreshExpiry = currentServerTime.AddHours(this.refreshTokenExpiresIn);

                    if (deserializedJsonObj.expires_in.Equals("0"))
                    {
                        int defaultAccessTokenExpiresIn = 100; // In Yearsint yearsToAdd = 100;
                        this.accessTokenExpiryTime = currentServerTime.AddYears(defaultAccessTokenExpiresIn).ToLongDateString() + " " + currentServerTime.AddYears(defaultAccessTokenExpiresIn).ToLongTimeString();
                    }

                    this.refreshTokenExpiryTime = refreshExpiry.ToLongDateString() + " " + refreshExpiry.ToLongTimeString();

                    fileStream = new FileStream(Request.MapPath(this.accessTokenFilePath), FileMode.OpenOrCreate, FileAccess.Write);
                    streamWriter = new StreamWriter(fileStream);
                    streamWriter.WriteLine(this.accessToken);
                    streamWriter.WriteLine(this.accessTokenExpiryTime);
                    streamWriter.WriteLine(this.refreshToken);
                    streamWriter.WriteLine(this.refreshTokenExpiryTime);

                    // Close and clean up the StreamReader
                    accessTokenResponseStream.Close();
                    return true;
                }
            }
            catch (WebException we)
            {
                string errorResponse = string.Empty;

                try
                {
                    using (StreamReader sr2 = new StreamReader(we.Response.GetResponseStream()))
                    {
                        errorResponse = sr2.ReadToEnd();
                        sr2.Close();
                    }
                }
                catch
                {
                    errorResponse = "Unable to get response";
                }

                message = errorResponse + Environment.NewLine + we.ToString();
            }
            catch (Exception ex)
            {
                message = ex.Message;
                return false;
            }
            finally
            {
                if (null != postStream)
                {
                    postStream.Close();
                }

                if (null != streamWriter)
                {
                    streamWriter.Close();
                }

                if (null != fileStream)
                {
                    fileStream.Close();
                }
            }
        }
        else if (type == AccessType.RefreshToken)
        {
            try
            {
                DateTime currentServerTime = DateTime.UtcNow.ToLocalTime();

                WebRequest accessTokenRequest = System.Net.HttpWebRequest.Create(string.Empty + this.fqdn + "/oauth/v4/token");
                accessTokenRequest.Method = "POST";

                string oauthParameters = "grant_type=refresh_token&client_id=" + this.apiKey + "&client_secret=" + this.secretKey + "&refresh_token=" + this.refreshToken;
                accessTokenRequest.ContentType = "application/x-www-form-urlencoded";

                UTF8Encoding encoding = new UTF8Encoding();
                byte[] postBytes = encoding.GetBytes(oauthParameters);
                accessTokenRequest.ContentLength = postBytes.Length;

                postStream = accessTokenRequest.GetRequestStream();
                postStream.Write(postBytes, 0, postBytes.Length);

                WebResponse accessTokenResponse = accessTokenRequest.GetResponse();
                using (StreamReader accessTokenResponseStream = new StreamReader(accessTokenResponse.GetResponseStream()))
                {
                    string accessTokenJSon = accessTokenResponseStream.ReadToEnd().ToString();
                    JavaScriptSerializer deserializeJsonObject = new JavaScriptSerializer();

                    AccessTokenResponse deserializedJsonObj = (AccessTokenResponse)deserializeJsonObject.Deserialize(accessTokenJSon, typeof(AccessTokenResponse));
                    this.accessToken = deserializedJsonObj.access_token.ToString();
                    DateTime accessTokenExpiryTime = currentServerTime.AddMilliseconds(Convert.ToDouble(deserializedJsonObj.expires_in.ToString()));
                    this.refreshToken = deserializedJsonObj.refresh_token.ToString();

                    fileStream = new FileStream(Request.MapPath(this.accessTokenFilePath), FileMode.OpenOrCreate, FileAccess.Write);
                    streamWriter = new StreamWriter(fileStream);
                    streamWriter.WriteLine(this.accessToken);
                    streamWriter.WriteLine(this.accessTokenExpiryTime);
                    streamWriter.WriteLine(this.refreshToken);

                    // Refresh token valids for 24 hours
                    DateTime refreshExpiry = currentServerTime.AddHours(24);
                    this.refreshTokenExpiryTime = refreshExpiry.ToLongDateString() + " " + refreshExpiry.ToLongTimeString();
                    streamWriter.WriteLine(refreshExpiry.ToLongDateString() + " " + refreshExpiry.ToLongTimeString());

                    accessTokenResponseStream.Close();
                    return true;
                }
            }
            catch (WebException we)
            {
                string errorResponse = string.Empty;

                try
                {
                    using (StreamReader sr2 = new StreamReader(we.Response.GetResponseStream()))
                    {
                        errorResponse = sr2.ReadToEnd();
                        sr2.Close();
                    }
                }
                catch
                {
                    errorResponse = "Unable to get response";
                }

                message = errorResponse + Environment.NewLine + we.ToString();
            }
            catch (Exception ex)
            {
                message = ex.Message;
                return false;
            }
            finally
            {
                if (null != postStream)
                {
                    postStream.Close();
                }

                if (null != streamWriter)
                {
                    streamWriter.Close();
                }

                if (null != fileStream)
                {
                    fileStream.Close();
                }
            }
        }

        return false;
    }

    /// <summary>
    /// Neglect the ssl handshake error with authentication server
    /// </summary>
    private static void BypassCertificateError()
    {
        string bypassSSL = ConfigurationManager.AppSettings["IgnoreSSL"];

        if ((!string.IsNullOrEmpty(bypassSSL))
            && (string.Equals(bypassSSL, "true", StringComparison.OrdinalIgnoreCase)))
        {
            ServicePointManager.ServerCertificateValidationCallback +=
                delegate(Object sender1, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
                {
                    return true;
                };
        }
    }


    /// <summary>
    /// This function is used to read access token file and validate the access token
    /// this function returns true if access token is valid, or else false is returned
    /// </summary>
    /// <param name="panelParam">Panel Details</param>
    /// <returns>Returns Boolean</returns>
    private bool ReadAndGetAccessToken(ref string responseString)
    {
        bool result = true;
        if (this.ReadAccessTokenFile(ref responseString) == false)
        {
            result = this.GetAccessToken(AccessType.ClientCredential, ref responseString);
        }
        else
        {
            string tokenValidity = this.IsTokenValid();
            if (tokenValidity == "REFRESH_TOKEN")
            {
                result = this.GetAccessToken(AccessType.RefreshToken, ref responseString);
            }
            else if (string.Compare(tokenValidity, "INVALID_ACCESS_TOKEN") == 0)
            {
                result = this.GetAccessToken(AccessType.ClientCredential, ref responseString);
            }
        }

        if (this.accessToken == null || this.accessToken.Length <= 0)
        {
            return false;
        }
        else
        {
            return result;
        }
    }
    #endregion


    #region Speech Service Functions


    /// <summary>
    /// This function invokes api SpeechToText to convert the given wav amr file and displays the result.
    /// </summary>
    private void TextToSpeech(string parEndPoint, string parURI, string parAccessToken, string parXarg, string parContentType, string parContent)
    {
        try
        {

            HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(string.Empty + parEndPoint + parURI);
            httpRequest.Headers.Add("Authorization", "Bearer " + parAccessToken);
            httpRequest.Headers.Add("X-SpeechContext", parXarg);
            httpRequest.ContentLength = parContent.Length;
            httpRequest.ContentType = parContentType;
            httpRequest.Accept = "audio/x-wav";
            httpRequest.Method = "POST";
            httpRequest.KeepAlive = true;

            UTF8Encoding encoding = new UTF8Encoding();
            byte[] postBytes = encoding.GetBytes(parContent);
            httpRequest.ContentLength = postBytes.Length;

            using (Stream writeStream = httpRequest.GetRequestStream())
            {
                writeStream.Write(postBytes, 0, postBytes.Length);
                writeStream.Close();
            }
            HttpWebResponse speechResponse = (HttpWebResponse)httpRequest.GetResponse();
            int offset = 0;
            int remaining = Convert.ToInt32(speechResponse.ContentLength);
            using (var stream = speechResponse.GetResponseStream())
            {
                receivedBytes = new byte[speechResponse.ContentLength];
                while (remaining > 0)
                {
                    int read = stream.Read(receivedBytes, offset, remaining);
                    if (read <= 0)
                    {
                        TTSErrorMessage = String.Format("End of stream reached with {0} bytes left to read", remaining);
                        return;
                    }

                    remaining -= read;
                    offset += read;
                }
                audioPlay.Attributes.Add("src", "data:audio/wav;base64," + Convert.ToBase64String(receivedBytes, Base64FormattingOptions.None));
                TTSSuccessMessage = "Success";
            }
        }
        catch (WebException we)
        {
            string errorResponse = string.Empty;
            try
            {
                using (StreamReader sr2 = new StreamReader(we.Response.GetResponseStream()))
                {
                    errorResponse = sr2.ReadToEnd();
                    sr2.Close();
                }
                TTSErrorMessage = errorResponse;
            }
            catch
            {
                errorResponse = "Unable to get response";
                TTSErrorMessage = errorResponse;
            }
        }
        catch (Exception ex)
        {
            TTSErrorMessage = ex.Message;
            return;
        }

    }


    #endregion
}

#region Access Token and Speech Response Data Structures

/// <summary>
/// Access Token Data Structure
/// </summary>
public class AccessTokenResponse
{
    /// <summary>
    /// Gets or sets Access Token ID
    /// </summary>
    public string access_token
    {
        get;
        set;
    }

    /// <summary>
    /// Gets or sets Refresh Token ID
    /// </summary>
    public string refresh_token
    {
        get;
        set;
    }

    /// <summary>
    /// Gets or sets Expires in milli seconds
    /// </summary>
    public string expires_in
    {
        get;
        set;
    }
}
#endregion

## MSRestfulV2_1_CsharpSpeechApp1.sln

Microsoft Visual Studio Solution File, Format Version 11.00
# Visual Studio 2010
Project("{E24C65DC-7377-472B-9ABA-BC803B73C61A}") = "app1", ".", "{07391EF4-B2EF-44A2-89EE-EC7E491EA534}"
	ProjectSection(WebsiteProperties) = preProject
		TargetFrameworkMoniker = ".NETFramework,Version%3Dv4.0"
		Debug.AspNetCompiler.VirtualPath = "/app1"
		Debug.AspNetCompiler.PhysicalPath = "..\app1\"
		Debug.AspNetCompiler.TargetPath = "PrecompiledWeb\app1\"
		Debug.AspNetCompiler.Updateable = "true"
		Debug.AspNetCompiler.ForceOverwrite = "true"
		Debug.AspNetCompiler.FixedNames = "false"
		Debug.AspNetCompiler.Debug = "True"
		Release.AspNetCompiler.VirtualPath = "/app1"
		Release.AspNetCompiler.PhysicalPath = "..\app1\"
		Release.AspNetCompiler.TargetPath = "PrecompiledWeb\app1\"
		Release.AspNetCompiler.Updateable = "true"
		Release.AspNetCompiler.ForceOverwrite = "true"
		Release.AspNetCompiler.FixedNames = "false"
		Release.AspNetCompiler.Debug = "False"
		VWDPort = "64812"
	EndProjectSection
EndProject
Global
	GlobalSection(SolutionConfigurationPlatforms) = preSolution
		Debug|Any CPU = Debug|Any CPU
	EndGlobalSection
	GlobalSection(ProjectConfigurationPlatforms) = postSolution
		{07391EF4-B2EF-44A2-89EE-EC7E491EA534}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{07391EF4-B2EF-44A2-89EE-EC7E491EA534}.Debug|Any CPU.Build.0 = Debug|Any CPU
	EndGlobalSection
	GlobalSection(SolutionProperties) = preSolution
		HideSolutionNode = FALSE
	EndGlobalSection
EndGlobal

## Web.config
<?xml version="1.0"?>
<!-- For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433 -->

<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0"/>
    <customErrors mode="Off"></customErrors>
  </system.web>
  <appSettings>
	  <!-- Set this parameter value to "true", if you need to bypass the SSL certificate. Default FALSE -->
	  <add key="IgnoreSSL" value="false"/>

	  <!-- This is mandatory parameter, set the value as per your registered application
    'API key' field value. -->
    <add key="api_key" value=""/>

    <!-- This is mandatory parameter, set the value as per your registered application
    'Secret key' field value. -->
    <add key="secret_key" value=""/>

    <!-- This is mandatory parameter, set it to the end point URI of AT&T Service. -->
    <add key="FQDN" value=""></add>

    <!-- Scope of the ATT service that will be invoked by the Application -->
    <add key="scope" value="TTS"/>

    <!-- This is optional parameter, which points to the file path, where application
    stores access token information. If the parameter is not configured, it will take
    the default value as ~\\SpeechApp1AccessToken.txt)
	  example: value="~\\Token.txt" -->
    <add key="AccessTokenFilePath" value =""/>

    <!-- This is mandatory parameter, which points to the directory which contains
    only speech files.  The filenames of this directory will be listed in drop down list.
	  example: value="~\\<TTSFilesDirPath>\\" -->
    <add key="TTSPlainText" value =""/>
    <add key="TTSSSML" value =""/>

    <!-- This is optional key, which specifies the expiry time of refresh token in Hrs. Default value is 24Hrs.
         example: value="24"-->
    <add key="refreshTokenExpiresIn" value=""/>

    <!-- This is optional key, the value of the this key is sent as a X-Agr hearder.
    which should contain name value pair separated by semicolan Ex: name=value,name1=value1 -->
    <add key="X-Arg" value="ClientApp=C#ClientApp,ClientVersion=2_2,ClientScreen=Browser,ClientSdk=C#Restful,DeviceType=WebServer,DeviceOs=Windows"/>


    <!-- These are optional keys.  the values are used for hyperlink -->
    <add key="SourceLink" value=""/>
    <add key="DownloadLink" value=""/>
    <add key="HelpLink" value=""/>

  </appSettings>
</configuration>
	******************************************************************************************
	* Licensed by AT&T under 'Software Development Kit Tools Agreement.' 2013
	* Copyright 2013 AT&T Intellectual Property. All rights reserved. http://developer.att.com
	* For more information contact developer.support@att.com<mailto:developer.support@att.com>
	******************************************************************************************

	AT&T API Samples - Text To Speech app 1
	--------------------------------

	This application allows the user to send an audio file for text to speech,
	and get the transcribed text.

	This file describes how to set up, configure and run the C# Applications of the
	AT&T .Net Restful sample applications.
	It covers all steps required to register the application on developer site and, based
	on the generated API keys and secrets, create and run one's own full-fledged
	sample applications.

	1. Configuration
	2. Installation
	3. Parameters
	4. Running the application


	1. Configuration

	Configuration consists of a few steps necessary to get an application registered
	on developer site with the proper services and endpoints, depending on the type of
	client-side application (autonomous/non-autonomous).

	To register an application, go to https://developer.att.com/ and login with
	your valid username and password. Next, choose "My Apps" from the bar at the top
	of the page and click the "Setup a New Application" button.

	Fill in the form, in particular all fields marked as "required".

	NOTE: You MUST select Text To Speech in the list of services under field 'Services' in
	order to use this sample application code.

	Having your application registered, you will get back an important pair of data:
	an API key and Secret key. They are necessary to get your applications working
	with the AT&T Platform APIs.

	Initially your newly registered application is restricted to the "Sandbox"
	environment only. To move it to production, you may promote it by clicking the
	"Promote to production" button. Notice that you will get a different API key and
	secret, so these values in your application should be adjusted accordingly.

	Depending on the kind of authentication used, an application may be based on
	either the Autonomous Client or the Web-Server Client OAuth flow.



	2. Installation

	** Requirements

	To run the examples you need an IIS Server.

	Download the application files from the download link published in AT&T portal
	into webdomain of your IIS server.



	3. Parameters

	Each sample application contains an web.config file. This file
	is located in the 'app' folder. This file holds configurable
	parameters described in an easy-to-read format. Please modify the
	web.config file using the comments specified within the file.

	Note: If your application is promoted from Sandbox environment to Production
	environment and you decide to use production application settings, you must
	update parameters as per production application details.



	4. Running the application

	Suppose you copied the sample app files in your IIS server webroot/texttospeech/app1/ folder.
	In order to run the sample application, type in'http://IIS_HOSTNAME:8080/texttospeech/app1/Default.aspx'
	(assuming you're using a HOSTNAME machine with IIS Server and have not changed the
	default port number, otherwise adjust accordingly) on your browser.
	<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="TTS_App1" %>

	<!DOCTYPE html>
	<!--
	Licensed by AT&T under 'Software Development Kit Tools Agreement.' 2013
	TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION: http://developer.att.com/sdk_agreement/
	Copyright 2013 AT&T Intellectual Property. All rights reserved. http://developer.att.com
	For more information contact developer.support@att.com
	-->
	<!--[if lt IE 7]> <html class="ie6" lang="en"> <![endif]-->
	<!--[if IE 7]> <html class="ie7" lang="en"> <![endif]-->
	<!--[if IE 8]> <html class="ie8" lang="en"> <![endif]-->
	<!--[if gt IE 8]><!-->
	<html lang="en">
	<!--<![endif]-->
	<head>
	<title>AT&T Sample Speech Application - Text To Speech </title>
	<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
	<meta id="viewport" name="viewport" content="width=device-width,minimum-scale=1,maximum-scale=1" />
	<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
	<link rel="stylesheet" type="text/css" href="style/common.css" />
	<script type="text/javascript">
	var _gaq = _gaq \|\| [];
	_gaq.push(['_setAccount', 'UA-33466541-1']);
	_gaq.push(['_trackPageview']);

	(function () {
	var ga = document.createElement('script');
	ga.type = 'text/javascript';
	ga.async = true;
	ga.src = ('https:' == document.location.protocol ? 'https://ssl'
	: 'http://www')
	+ '.google-analytics.com/ga.js';
	var s = document.getElementsByTagName('script')[0];
	s.parentNode.insertBefore(ga, s);
	})();
	</script>
	</head>
	<body>
	<div id="pageContainer" class="pageContainer">
	<div id="header">
	<div class="logo" id="top">
	</div>
	<div id="menuButton" class="hide">
	<a id="jump" href="#nav">Main Navigation</a>
	</div>
	<ul class="links" id="nav">

	<li><a id="SourceLink" runat="server" target="_blank">Source<img src="images/source.png"
	alt="" />
	</a><span class="divider">\| </span> </li>
	<li><a id="DownloadLink" runat="server" target="_blank">Download<img src="images/download.png"
	alt="" />
	</a><span class="divider">\| </span> </li>
	<li><a id="HelpLink" runat="server" target="_blank">Help </a></li>
	<li id="back"><a href="#top">Back to top</a></li>
	</ul>
	</div>
	<form id="form1" runat="server">
	<div class="content">
	<div class="contentHeading">
	<h1>
	AT&T Sample Application - Text To Speech</h1>
	<div id="introtext">
	<div>
	<b>Server Time: </b><%= String.Format("{0:ddd, MMMM dd, yyyy HH:mm:ss}", DateTime.UtcNow) + " UTC" %>
	</div>
	<div>
	<b>Client Time:</b>
	<script language="JavaScript" type="text/javascript">
	var myDate = new Date();
	document.write(myDate);
	</script>
	</div>
	<div>
	<b>User Agent:</b>
	<script language="JavaScript" type="text/javascript">
	document.write("" + navigator.userAgent);
	</script>
	</div>
	</div>
	</div>
	<div class="formBox" id="formBox">
	<div id="formContainer" class="formContainer">
	<div id="formData">
	<h3>
	Content Type:
	</h3>
	<asp:DropDownList ID="ContentType" name="ContentType" runat="server">
	<asp:ListItem value="text/plain" Selected="True" Text="text/plain" />
	<asp:ListItem value="application/ssml+xml" Text="application/ssml+xml" />
	</asp:DropDownList>
	<h3>Content:</h3>
	<label>text/plain</label><br/>
	<asp:TextBox ID="plaintext" type="text" runat="server" name="plaintext" TextMode="MultiLine" Enabled="False" Rows="4"></asp:TextBox><br/>
	<label>application/ssml</label><br/>
	<asp:TextBox ID="ssml" type="text" runat="server" name="ssml" TextMode="MultiLine" Enabled="False" Rows="4"></asp:TextBox >
	<h3>
	X-Arg:
	</h3>
	<asp:TextBox ID="x_arg" runat="server" TextMode="MultiLine" type="text" Enabled="False" Rows="4"></asp:TextBox>
	<br />
	<button id="btnSubmit" onserverclick="BtnSubmit_Click" runat="server" name="TextToSpeechButton"
	type="submit">
	Submit</button>
	<% if (!string.IsNullOrEmpty(TTSSuccessMessage)){%>
	<div class="successWide" align="left">
	<strong>SUCCESS:</strong>
	<audio controls="controls" autobuffer="autobuffer" autoplay="autoplay" runat="server" id="audioPlay">
	</audio>
	</div>
	<% } %>
	<% if (!string.IsNullOrEmpty(TTSErrorMessage)){%>
	<div class="errorWide">
	<strong>ERROR:</strong>
	<br>
	<%= TTSErrorMessage%>
	</div>
	<% } %>
	</div>
	</div>
	</div>
	</div>
	</form>
	<div id="footer">
	<div id="ft">
	<div id="powered_by">
	Powered by AT&T Cloud Architecture
	</div>
	<p>
	The Application hosted on this site are working examples intended to be used for
	reference in creating products to consume AT&T Services and not meant to be
	used as part of your product. The data in these pages is for test purposes only
	and intended only for use as a reference in how the services perform.
	<br />
	<br />
	For download of tools and documentation, please go to <a href="https://developer.att.com/"
	target="_blank">https://developer.att.com</a>
	<br />
	For more information contact <a href="mailto:developer.support@att.com">developer.support@att.com</a>
	<br />
	<br />
	© 2014 AT&T Intellectual Property. All rights reserved. <a href="https://developer.att.com/"
	target="_blank">https://developer.att.com</a>
	</p>
	</div>
	<!-- end of ft -->
	</div>
	<!-- end of footer -->
	</div>
	</body>
	</html>
	// <copyright file="Default.aspx.cs" company="AT&T">
	// Licensed by AT&T under 'Software Development Kit Tools Agreement.' 2013
	// TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION: http://developer.att.com/sdk_agreement/
	// Copyright 2013 AT&T Intellectual Property. All rights reserved. http://developer.att.com
	// For more information contact developer.support@att.com
	// </copyright>

	#region References

	using System;
	using System.Collections.Generic;
	using System.Configuration;
	using System.IO;
	using System.Net;
	using System.Net.Security;
	using System.Security.Cryptography.X509Certificates;
	using System.Text;
	using System.Web;
	using System.Web.Script.Serialization;
	using System.Web.UI.HtmlControls;


	#endregion

	/// <summary>
	/// Speech application
	/// </summary>
	public partial class TTS_App1 : System.Web.UI.Page
	{
	#region Class variables and Data structures
	/// <summary>
	/// Temporary variables for processing
	/// </summary>
	private string fqdn, accessTokenFilePath;

	/// <summary>
	/// Temporary variables for processing
	/// </summary>
	private string apiKey, secretKey, accessToken, scope, refreshToken, refreshTokenExpiryTime, accessTokenExpiryTime, bypassSSL;

	/// <summary>
	/// variable for having the posted file.
	/// </summary>
	private string TTSPlainText = string.Empty;
	private string TTSSSML = string.Empty;

	/// <summary>
	/// Gets or sets the value of refreshTokenExpiresIn
	/// </summary>
	private int refreshTokenExpiresIn;

	string xArgsData = string.Empty;

	public string TTSErrorMessage = string.Empty;
	public string TTSSuccessMessage = string.Empty;
	public byte[] receivedBytes = null;

	/// <summary>
	/// Access Token Types
	/// </summary>
	public enum AccessType
	{
	/// <summary>
	/// Access Token Type is based on Client Credential Mode
	/// </summary>
	ClientCredential,

	/// <summary>
	/// Access Token Type is based on Refresh Token
	/// </summary>
	RefreshToken
	}
	#endregion

	#region Events

	/// <summary>
	/// This function is called when the applicaiton page is loaded into the browser.
	/// This function reads the web.config and gets the values of the attributes
	/// </summary>
	/// <param name="sender">Button that caused this event</param>
	/// <param name="e">Event that invoked this function</param>
	protected void Page_Load(object sender, EventArgs e)
	{
	BypassCertificateError();

	this.ReadConfigFile();

	this.SetContent();
	}

	private void SetContent()
	{
	StreamReader streamReaderPlain = new StreamReader(this.TTSPlainText);
	plaintext.Text = streamReaderPlain.ReadToEnd();
	streamReaderPlain.Close();
	StreamReader streamReaderSSML = new StreamReader(this.TTSSSML);
	ssml.Text = streamReaderSSML.ReadToEnd();
	streamReaderSSML.Close();
	}

	/// <summary>
	/// Method that calls SpeechToText api when user clicked on submit button
	/// </summary>
	/// <param name="sender">sender that invoked this event</param>
	/// <param name="e">eventargs of the button</param>
	protected void BtnSubmit_Click(object sender, EventArgs e)
	{
	try
	{
	bool IsValid = true;

	IsValid = this.ReadAndGetAccessToken(ref TTSErrorMessage);
	if (IsValid == false)
	{
	TTSErrorMessage = "Unable to get access token";
	return;
	}
	string content = string.Empty;
	if (string.Compare(ContentType.SelectedValue, "text/plain") == 0)
	{
	content = plaintext.Text;
	}
	else
	{
	content = ssml.Text;
	}

	this.TextToSpeech(this.fqdn, "/speech/v3/textToSpeech", this.accessToken, x_arg.Text, ContentType.SelectedValue, content);
	/*
	this.ConvertToSpeech(this.fqdn + "/rest/2/SpeechToText",
	this.accessToken, SpeechContext.SelectedValue.ToString(), x_arg.Text, speechFile, chunkValue);
	*/
	}
	catch (Exception ex)
	{
	TTSErrorMessage = ex.Message;
	return;
	}
	}

	#endregion

	#region Access Token Related Functions

	/// <summary>
	/// Read parameters from configuraton file
	/// </summary>
	/// <returns>true/false; true if all required parameters are specified, else false</returns>
	private bool ReadConfigFile()
	{
	this.accessTokenFilePath = ConfigurationManager.AppSettings["AccessTokenFilePath"];
	if (string.IsNullOrEmpty(this.accessTokenFilePath))
	{
	this.accessTokenFilePath = "~\\SpeechApp1AccessToken.txt";
	}

	this.fqdn = ConfigurationManager.AppSettings["FQDN"];
	if (string.IsNullOrEmpty(this.fqdn))
	{
	TTSErrorMessage = "FQDN is not defined in configuration file";
	return false;
	}

	this.apiKey = ConfigurationManager.AppSettings["api_key"];
	if (string.IsNullOrEmpty(this.apiKey))
	{
	TTSErrorMessage = "api_key is not defined in configuration file";
	return false;
	}

	this.secretKey = ConfigurationManager.AppSettings["secret_key"];
	if (string.IsNullOrEmpty(this.secretKey))
	{
	TTSErrorMessage = "secret_key is not defined in configuration file";
	return false;
	}

	this.scope = ConfigurationManager.AppSettings["scope"];
	if (string.IsNullOrEmpty(this.scope))
	{
	this.scope = "TTS";
	}

	string refreshTokenExpires = ConfigurationManager.AppSettings["refreshTokenExpiresIn"];
	if (!string.IsNullOrEmpty(refreshTokenExpires))
	{
	this.refreshTokenExpiresIn = Convert.ToInt32(refreshTokenExpires);
	}
	else
	{
	this.refreshTokenExpiresIn = 24;
	}
	if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["SourceLink"]))
	{
	SourceLink.HRef = ConfigurationManager.AppSettings["SourceLink"];
	}
	else
	{
	SourceLink.HRef = "#"; // Default value
	}

	if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["DownloadLink"]))
	{
	DownloadLink.HRef = ConfigurationManager.AppSettings["DownloadLink"];
	}
	else
	{
	DownloadLink.HRef = "#"; // Default value
	}

	if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["HelpLink"]))
	{
	HelpLink.HRef = ConfigurationManager.AppSettings["HelpLink"];
	}
	else
	{
	HelpLink.HRef = "#"; // Default value
	}

	if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["TTSPlainText"]))
	{
	this.TTSPlainText = Request.MapPath(ConfigurationManager.AppSettings["TTSPlainText"]);
	}

	if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["TTSSSML"]))
	{
	this.TTSSSML = Request.MapPath(ConfigurationManager.AppSettings["TTSSSML"]);
	}

	if (!IsPostBack)
	{
	if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["X-Arg"]))
	{
	xArgsData = HttpUtility.UrlEncode(ConfigurationManager.AppSettings["X-Arg"]);
	x_arg.Text = ConfigurationManager.AppSettings["X-Arg"];
	}
	}

	return true;
	}


	/// <summary>
	/// This function reads the Access Token File and stores the values of access token, expiry seconds
	/// refresh token, last access token time and refresh token expiry time
	/// This funciton returns true, if access token file and all others attributes read successfully otherwise returns false
	/// </summary>
	/// <param name="panelParam">Panel Details</param>
	/// <returns>Returns boolean</returns>
	private bool ReadAccessTokenFile(ref string message)
	{
	FileStream fileStream = null;
	StreamReader streamReader = null;
	try
	{
	fileStream = new FileStream(Request.MapPath(this.accessTokenFilePath), FileMode.OpenOrCreate, FileAccess.Read);
	streamReader = new StreamReader(fileStream);
	this.accessToken = streamReader.ReadLine();
	this.accessTokenExpiryTime = streamReader.ReadLine();
	this.refreshToken = streamReader.ReadLine();
	this.refreshTokenExpiryTime = streamReader.ReadLine();
	}
	catch (Exception ex)
	{
	message = ex.Message;
	return false;
	}
	finally
	{
	if (null != streamReader)
	{
	streamReader.Close();
	}

	if (null != fileStream)
	{
	fileStream.Close();
	}
	}

	if ((this.accessToken == null) \|\| (this.accessTokenExpiryTime == null) \|\| (this.refreshToken == null) \|\| (this.refreshTokenExpiryTime == null))
	{
	return false;
	}

	return true;
	}

	/// <summary>
	/// This function validates the expiry of the access token and refresh token.
	/// function compares the current time with the refresh token taken time, if current time is greater then returns INVALID_REFRESH_TOKEN
	/// function compares the difference of last access token taken time and the current time with the expiry seconds, if its more, returns INVALID_ACCESS_TOKEN
	/// otherwise returns VALID_ACCESS_TOKEN
	/// </summary>
	/// <returns>string, which specifies the token validity</returns>
	private string IsTokenValid()
	{
	try
	{
	DateTime currentServerTime = DateTime.UtcNow.ToLocalTime();
	if (currentServerTime >= DateTime.Parse(this.accessTokenExpiryTime))
	{
	if (currentServerTime >= DateTime.Parse(this.refreshTokenExpiryTime))
	{
	return "INVALID_ACCESS_TOKEN";
	}
	else
	{
	return "REFRESH_TOKEN";
	}
	}
	else
	{
	return "VALID_ACCESS_TOKEN";
	}
	}
	catch
	{
	return "INVALID_ACCESS_TOKEN";
	}
	}

	/// <summary>
	/// This function get the access token based on the type parameter type values.
	/// If type value is 1, access token is fetch for client credential flow
	/// If type value is 2, access token is fetch for client credential flow based on the exisiting refresh token
	/// </summary>
	/// <param name="type">Type as integer</param>
	/// <param name="panelParam">Panel details</param>
	/// <returns>Return boolean</returns>
	private bool GetAccessToken(AccessType type, ref string message)
	{
	FileStream fileStream = null;
	Stream postStream = null;
	StreamWriter streamWriter = null;

	// This is client credential flow
	if (type == AccessType.ClientCredential)
	{
	try
	{
	DateTime currentServerTime = DateTime.UtcNow.ToLocalTime();

	WebRequest accessTokenRequest = System.Net.HttpWebRequest.Create(string.Empty + this.fqdn + "/oauth/v4/token");
	accessTokenRequest.Method = "POST";
	string oauthParameters = string.Empty;
	if (type == AccessType.ClientCredential)
	{
	oauthParameters = "client_id=" + this.apiKey + "&client_secret=" + this.secretKey + "&grant_type=client_credentials&scope=" + this.scope;
	}
	else
	{
	oauthParameters = "grant_type=refresh_token&client_id=" + this.apiKey + "&client_secret=" + this.secretKey + "&refresh_token=" + this.refreshToken;
	}

	accessTokenRequest.ContentType = "application/x-www-form-urlencoded";

	UTF8Encoding encoding = new UTF8Encoding();
	byte[] postBytes = encoding.GetBytes(oauthParameters);
	accessTokenRequest.ContentLength = postBytes.Length;

	postStream = accessTokenRequest.GetRequestStream();
	postStream.Write(postBytes, 0, postBytes.Length);

	WebResponse accessTokenResponse = accessTokenRequest.GetResponse();
	using (StreamReader accessTokenResponseStream = new StreamReader(accessTokenResponse.GetResponseStream()))
	{
	string jsonAccessToken = accessTokenResponseStream.ReadToEnd().ToString();
	JavaScriptSerializer deserializeJsonObject = new JavaScriptSerializer();

	AccessTokenResponse deserializedJsonObj = (AccessTokenResponse)deserializeJsonObject.Deserialize(jsonAccessToken, typeof(AccessTokenResponse));

	this.accessToken = deserializedJsonObj.access_token;
	this.accessTokenExpiryTime = currentServerTime.AddSeconds(Convert.ToDouble(deserializedJsonObj.expires_in)).ToString();
	this.refreshToken = deserializedJsonObj.refresh_token;

	DateTime refreshExpiry = currentServerTime.AddHours(this.refreshTokenExpiresIn);

	if (deserializedJsonObj.expires_in.Equals("0"))
	{
	int defaultAccessTokenExpiresIn = 100; // In Yearsint yearsToAdd = 100;
	this.accessTokenExpiryTime = currentServerTime.AddYears(defaultAccessTokenExpiresIn).ToLongDateString() + " " + currentServerTime.AddYears(defaultAccessTokenExpiresIn).ToLongTimeString();
	}

	this.refreshTokenExpiryTime = refreshExpiry.ToLongDateString() + " " + refreshExpiry.ToLongTimeString();

	fileStream = new FileStream(Request.MapPath(this.accessTokenFilePath), FileMode.OpenOrCreate, FileAccess.Write);
	streamWriter = new StreamWriter(fileStream);
	streamWriter.WriteLine(this.accessToken);
	streamWriter.WriteLine(this.accessTokenExpiryTime);
	streamWriter.WriteLine(this.refreshToken);
	streamWriter.WriteLine(this.refreshTokenExpiryTime);

	// Close and clean up the StreamReader
	accessTokenResponseStream.Close();
	return true;
	}
	}
	catch (WebException we)
	{
	string errorResponse = string.Empty;

	try
	{
	using (StreamReader sr2 = new StreamReader(we.Response.GetResponseStream()))
	{
	errorResponse = sr2.ReadToEnd();
	sr2.Close();
	}
	}
	catch
	{
	errorResponse = "Unable to get response";
	}

	message = errorResponse + Environment.NewLine + we.ToString();
	}
	catch (Exception ex)
	{
	message = ex.Message;
	return false;
	}
	finally
	{
	if (null != postStream)
	{
	postStream.Close();
	}

	if (null != streamWriter)
	{
	streamWriter.Close();
	}

	if (null != fileStream)
	{
	fileStream.Close();
	}
	}
	}
	else if (type == AccessType.RefreshToken)
	{
	try
	{
	DateTime currentServerTime = DateTime.UtcNow.ToLocalTime();

	WebRequest accessTokenRequest = System.Net.HttpWebRequest.Create(string.Empty + this.fqdn + "/oauth/v4/token");
	accessTokenRequest.Method = "POST";

	string oauthParameters = "grant_type=refresh_token&client_id=" + this.apiKey + "&client_secret=" + this.secretKey + "&refresh_token=" + this.refreshToken;
	accessTokenRequest.ContentType = "application/x-www-form-urlencoded";

	UTF8Encoding encoding = new UTF8Encoding();
	byte[] postBytes = encoding.GetBytes(oauthParameters);
	accessTokenRequest.ContentLength = postBytes.Length;

	postStream = accessTokenRequest.GetRequestStream();
	postStream.Write(postBytes, 0, postBytes.Length);

	WebResponse accessTokenResponse = accessTokenRequest.GetResponse();
	using (StreamReader accessTokenResponseStream = new StreamReader(accessTokenResponse.GetResponseStream()))
	{
	string accessTokenJSon = accessTokenResponseStream.ReadToEnd().ToString();
	JavaScriptSerializer deserializeJsonObject = new JavaScriptSerializer();

	AccessTokenResponse deserializedJsonObj = (AccessTokenResponse)deserializeJsonObject.Deserialize(accessTokenJSon, typeof(AccessTokenResponse));
	this.accessToken = deserializedJsonObj.access_token.ToString();
	DateTime accessTokenExpiryTime = currentServerTime.AddMilliseconds(Convert.ToDouble(deserializedJsonObj.expires_in.ToString()));
	this.refreshToken = deserializedJsonObj.refresh_token.ToString();

	fileStream = new FileStream(Request.MapPath(this.accessTokenFilePath), FileMode.OpenOrCreate, FileAccess.Write);
	streamWriter = new StreamWriter(fileStream);
	streamWriter.WriteLine(this.accessToken);
	streamWriter.WriteLine(this.accessTokenExpiryTime);
	streamWriter.WriteLine(this.refreshToken);

	// Refresh token valids for 24 hours
	DateTime refreshExpiry = currentServerTime.AddHours(24);
	this.refreshTokenExpiryTime = refreshExpiry.ToLongDateString() + " " + refreshExpiry.ToLongTimeString();
	streamWriter.WriteLine(refreshExpiry.ToLongDateString() + " " + refreshExpiry.ToLongTimeString());

	accessTokenResponseStream.Close();
	return true;
	}
	}
	catch (WebException we)
	{
	string errorResponse = string.Empty;

	try
	{
	using (StreamReader sr2 = new StreamReader(we.Response.GetResponseStream()))
	{
	errorResponse = sr2.ReadToEnd();
	sr2.Close();
	}
	}
	catch
	{
	errorResponse = "Unable to get response";
	}

	message = errorResponse + Environment.NewLine + we.ToString();
	}
	catch (Exception ex)
	{
	message = ex.Message;
	return false;
	}
	finally
	{
	if (null != postStream)
	{
	postStream.Close();
	}

	if (null != streamWriter)
	{
	streamWriter.Close();
	}

	if (null != fileStream)
	{
	fileStream.Close();
	}
	}
	}

	return false;
	}

	/// <summary>
	/// Neglect the ssl handshake error with authentication server
	/// </summary>
	private static void BypassCertificateError()
	{
	string bypassSSL = ConfigurationManager.AppSettings["IgnoreSSL"];

	if ((!string.IsNullOrEmpty(bypassSSL))
	&& (string.Equals(bypassSSL, "true", StringComparison.OrdinalIgnoreCase)))
	{
	ServicePointManager.ServerCertificateValidationCallback +=
	delegate(Object sender1, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
	{
	return true;
	};
	}
	}


	/// <summary>
	/// This function is used to read access token file and validate the access token
	/// this function returns true if access token is valid, or else false is returned
	/// </summary>
	/// <param name="panelParam">Panel Details</param>
	/// <returns>Returns Boolean</returns>
	private bool ReadAndGetAccessToken(ref string responseString)
	{
	bool result = true;
	if (this.ReadAccessTokenFile(ref responseString) == false)
	{
	result = this.GetAccessToken(AccessType.ClientCredential, ref responseString);
	}
	else
	{
	string tokenValidity = this.IsTokenValid();
	if (tokenValidity == "REFRESH_TOKEN")
	{
	result = this.GetAccessToken(AccessType.RefreshToken, ref responseString);
	}
	else if (string.Compare(tokenValidity, "INVALID_ACCESS_TOKEN") == 0)
	{
	result = this.GetAccessToken(AccessType.ClientCredential, ref responseString);
	}
	}

	if (this.accessToken == null \|\| this.accessToken.Length <= 0)
	{
	return false;
	}
	else
	{
	return result;
	}
	}
	#endregion


	#region Speech Service Functions


	/// <summary>
	/// This function invokes api SpeechToText to convert the given wav amr file and displays the result.
	/// </summary>
	private void TextToSpeech(string parEndPoint, string parURI, string parAccessToken, string parXarg, string parContentType, string parContent)
	{
	try
	{

	HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(string.Empty + parEndPoint + parURI);
	httpRequest.Headers.Add("Authorization", "Bearer " + parAccessToken);
	httpRequest.Headers.Add("X-SpeechContext", parXarg);
	httpRequest.ContentLength = parContent.Length;
	httpRequest.ContentType = parContentType;
	httpRequest.Accept = "audio/x-wav";
	httpRequest.Method = "POST";
	httpRequest.KeepAlive = true;

	UTF8Encoding encoding = new UTF8Encoding();
	byte[] postBytes = encoding.GetBytes(parContent);
	httpRequest.ContentLength = postBytes.Length;

	using (Stream writeStream = httpRequest.GetRequestStream())
	{
	writeStream.Write(postBytes, 0, postBytes.Length);
	writeStream.Close();
	}
	HttpWebResponse speechResponse = (HttpWebResponse)httpRequest.GetResponse();
	int offset = 0;
	int remaining = Convert.ToInt32(speechResponse.ContentLength);
	using (var stream = speechResponse.GetResponseStream())
	{
	receivedBytes = new byte[speechResponse.ContentLength];
	while (remaining > 0)
	{
	int read = stream.Read(receivedBytes, offset, remaining);
	if (read <= 0)
	{
	TTSErrorMessage = String.Format("End of stream reached with {0} bytes left to read", remaining);
	return;
	}

	remaining -= read;
	offset += read;
	}
	audioPlay.Attributes.Add("src", "data:audio/wav;base64," + Convert.ToBase64String(receivedBytes, Base64FormattingOptions.None));
	TTSSuccessMessage = "Success";
	}
	}
	catch (WebException we)
	{
	string errorResponse = string.Empty;
	try
	{
	using (StreamReader sr2 = new StreamReader(we.Response.GetResponseStream()))
	{
	errorResponse = sr2.ReadToEnd();
	sr2.Close();
	}
	TTSErrorMessage = errorResponse;
	}
	catch
	{
	errorResponse = "Unable to get response";
	TTSErrorMessage = errorResponse;
	}
	}
	catch (Exception ex)
	{
	TTSErrorMessage = ex.Message;
	return;
	}

	}


	#endregion
	}

	#region Access Token and Speech Response Data Structures

	/// <summary>
	/// Access Token Data Structure
	/// </summary>
	public class AccessTokenResponse
	{
	/// <summary>
	/// Gets or sets Access Token ID
	/// </summary>
	public string access_token
	{
	get;
	set;
	}

	/// <summary>
	/// Gets or sets Refresh Token ID
	/// </summary>
	public string refresh_token
	{
	get;
	set;
	}

	/// <summary>
	/// Gets or sets Expires in milli seconds
	/// </summary>
	public string expires_in
	{
	get;
	set;
	}
	}
	#endregion

	Microsoft Visual Studio Solution File, Format Version 11.00
	# Visual Studio 2010
	Project("{E24C65DC-7377-472B-9ABA-BC803B73C61A}") = "app1", ".", "{07391EF4-B2EF-44A2-89EE-EC7E491EA534}"
	ProjectSection(WebsiteProperties) = preProject
	TargetFrameworkMoniker = ".NETFramework,Version%3Dv4.0"
	Debug.AspNetCompiler.VirtualPath = "/app1"
	Debug.AspNetCompiler.PhysicalPath = "..\app1\"
	Debug.AspNetCompiler.TargetPath = "PrecompiledWeb\app1\"
	Debug.AspNetCompiler.Updateable = "true"
	Debug.AspNetCompiler.ForceOverwrite = "true"
	Debug.AspNetCompiler.FixedNames = "false"
	Debug.AspNetCompiler.Debug = "True"
	Release.AspNetCompiler.VirtualPath = "/app1"
	Release.AspNetCompiler.PhysicalPath = "..\app1\"
	Release.AspNetCompiler.TargetPath = "PrecompiledWeb\app1\"
	Release.AspNetCompiler.Updateable = "true"
	Release.AspNetCompiler.ForceOverwrite = "true"
	Release.AspNetCompiler.FixedNames = "false"
	Release.AspNetCompiler.Debug = "False"
	VWDPort = "64812"
	EndProjectSection
	EndProject
	Global
	GlobalSection(SolutionConfigurationPlatforms) = preSolution
	Debug\|Any CPU = Debug\|Any CPU
	EndGlobalSection
	GlobalSection(ProjectConfigurationPlatforms) = postSolution
	{07391EF4-B2EF-44A2-89EE-EC7E491EA534}.Debug\|Any CPU.ActiveCfg = Debug\|Any CPU
	{07391EF4-B2EF-44A2-89EE-EC7E491EA534}.Debug\|Any CPU.Build.0 = Debug\|Any CPU
	EndGlobalSection
	GlobalSection(SolutionProperties) = preSolution
	HideSolutionNode = FALSE
	EndGlobalSection
	EndGlobal
	<?xml version="1.0"?>
	<!-- For more information on how to configure your ASP.NET application, please visit
	http://go.microsoft.com/fwlink/?LinkId=169433 -->

	<configuration>
	<system.web>
	<compilation debug="true" targetFramework="4.0"/>
	<customErrors mode="Off"></customErrors>
	</system.web>
	<appSettings>
	<!-- Set this parameter value to "true", if you need to bypass the SSL certificate. Default FALSE -->
	<add key="IgnoreSSL" value="false"/>

	<!-- This is mandatory parameter, set the value as per your registered application
	'API key' field value. -->
	<add key="api_key" value=""/>

	<!-- This is mandatory parameter, set the value as per your registered application
	'Secret key' field value. -->
	<add key="secret_key" value=""/>

	<!-- This is mandatory parameter, set it to the end point URI of AT&T Service. -->
	<add key="FQDN" value=""></add>

	<!-- Scope of the ATT service that will be invoked by the Application -->
	<add key="scope" value="TTS"/>

	<!-- This is optional parameter, which points to the file path, where application
	stores access token information. If the parameter is not configured, it will take
	the default value as ~\\SpeechApp1AccessToken.txt)
	example: value="~\\Token.txt" -->
	<add key="AccessTokenFilePath" value =""/>

	<!-- This is mandatory parameter, which points to the directory which contains
	only speech files. The filenames of this directory will be listed in drop down list.
	example: value="~\\<TTSFilesDirPath>\\" -->
	<add key="TTSPlainText" value =""/>
	<add key="TTSSSML" value =""/>

	<!-- This is optional key, which specifies the expiry time of refresh token in Hrs. Default value is 24Hrs.
	example: value="24"-->
	<add key="refreshTokenExpiresIn" value=""/>

	<!-- This is optional key, the value of the this key is sent as a X-Agr hearder.
	which should contain name value pair separated by semicolan Ex: name=value,name1=value1 -->
	<add key="X-Arg" value="ClientApp=C#ClientApp,ClientVersion=2_2,ClientScreen=Browser,ClientSdk=C#Restful,DeviceType=WebServer,DeviceOs=Windows"/>


	<!-- These are optional keys. the values are used for hyperlink -->
	<add key="SourceLink" value=""/>
	<add key="DownloadLink" value=""/>
	<add key="HelpLink" value=""/>

	</appSettings>
	</configuration>