public class SharePointProvider : ChatProvider
    {
        public string GetCurrentSiteURL()
        {
            return "http://" + HttpContext.Current.Request.Url.Host + HttpContext.Current.Request.ApplicationPath;

        }
        public override string GetConnectionString()
        {
            string connectonString = "Server=(local);integrated security=true;database=sharepoint";
            return connectonString;
        }
        public override string FindUserLoginName(string nickName)
        {

            string loginName = null; ;
            using (SPSite mSite = new SPSite(GetCurrentSiteURL()))
            {
                SPWeb rootWeb = mSite.RootWeb;
                for (int i = 0; i < rootWeb.AllUsers.Count; i++)
                {
                    if (nickName == rootWeb.AllUsers[i].LoginName)
                    {
                        loginName = rootWeb.AllUsers[i].LoginName;
                    }
                }
            }
            return loginName;

        }
        public override AppChatIdentity GetLogonIdentity()
        {
            using (SPSite mSite = new SPSite(GetCurrentSiteURL()))
            {
                SPWeb rootWeb = mSite.RootWeb;
                SPUser mSPUser = rootWeb.CurrentUser;
                string loginName = mSPUser.LoginName;
                string nickName = mSPUser.LoginName;
                //string name = mSPUser.LoginName.Remove(0, mSPUser.LoginName.IndexOf("\\") + 1);

                return new AppChatIdentity(nickName, false, ToUserId(loginName), HttpContext.Current.Request.UserHostAddress);

            }
        }
        public override bool GetUserInfo(string loginName, ref string nickName, ref bool isAdmin)
        {
            using (SPSite mSite = new SPSite(GetCurrentSiteURL()))
            {
                SPWeb rootWeb = mSite.RootWeb;

                for (int i = 0; i < rootWeb.AllUsers.Count; i++)
                {
                    if (loginName == rootWeb.AllUsers[i].LoginName)
                    {
                        nickName = rootWeb.AllUsers[i].LoginName;
                        isAdmin = rootWeb.AllUsers[i].IsSiteAdmin;
                        return true;
                    }
                }
            }
            return false;
        }
        public override bool ValidateUser(string loginName, string password)
        {

            //if (!Membership.ValidateUser(loginName, password))
            //{
            //    return false;
            //}
            //System.Web.Security.FormsAuthentication.SetAuthCookie(loginName, false, "/");

            return true;
        }

    }