contact/Pages/Contact.cshtml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Mvc;
using System.Net.Mail;
using System.Net;
//for captcha:
using System.Net.Http;
using System.Net.Http.Headers;
using Newtonsoft.Json.Linq;
using Microsoft.Extensions.Configuration;

namespace contact.Pages
{

    public class ContactFormModel
    {
        [Required]
        public string Name { get; set; }
        [Required]
        public string Company { get; set; }
        [Required, EmailAddress]
        public string Email { get; set; }
        [Required]
        public string Message { get; set; }
    }

    public class ContactModel : PageModel
    {
        public string Message { get; set; }
        [BindProperty]
        public ContactFormModel Contact { get; set; }

        private readonly IConfiguration _configuration;
        public ContactModel(IConfiguration configuration)
        {
            _configuration = configuration;
        }

        public ActionResult OnPost()
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }


            if (!ReCaptchaPassed(
                        Request.Form["g-recaptcha-response"], // that's how you get it from the Request object
                        _configuration.GetSection("GoogleReCaptcha:secret").Value
                        ))
            {
                //ModelState.AddModelError(string.Empty, "You failed the CAPTCHA, stupid robot. Go play some 1x1 on SFs instead.");
                return StatusCode(400);
            }



            //fuck those Russian spammers
            if (Contact.Company.ToLowerInvariant() != "google")
                SendMail();

            //TODO: go to a successful submit page on the ayanova site            
            //return Redirect("/confirm.html");//sample quickie page I made up
            return Redirect("https://ayanova.com/confirmed.htm");
        }


        private void SendMail()
        {
            var MessageBody = $"Name:\r\n{Contact.Name}\r\n\r\nCompany:\r\n{Contact.Company}\r\n\r\nMessage:\r\n{Contact.Message}";

            //SEND TO US
            using (var message = new MailMessage())
            {
                message.To.Add(new MailAddress("support@ayanova.com"));
                message.From = new MailAddress(Contact.Email);
                message.Subject = $"Question about AyaNova from {Contact.Company}";
                message.Body = MessageBody;
                using (var smtpClient = new SmtpClient("mail.ayanova.com"))
                {

                    smtpClient.Host = "mail.ayanova.com";
                    smtpClient.Port = 2525;
                    smtpClient.UseDefaultCredentials = false;
                    //testing
                    // smtpClient.EnableSsl=true;
                    // smtpClient.Port=465;
                    // smtpClient.DeliveryMethod= SmtpDeliveryMethod.Network;



                    //NOTE: Do not use the noreply email address to send mail, it crashes the server somehow

                    //******************************************************************************************************************
                    //******************************************************************************************************************
                    //TEST CRASH
                    // smtpClient.Credentials = new System.Net.NetworkCredential("noreply@ayanova.com", "91768700489f8edd28aa71e3e0f4073eba54ce83c4c1a6a910700fa94094ddfd");                    

                    smtpClient.Credentials = new System.Net.NetworkCredential("webmaster@ayanova.com", "c63c17add818fca81cae71a241ea1b552675a86280b7e7e45d36cbf2e8f3bc0e");
                    //******************************************************************************************************************
                    //******************************************************************************************************************

                    smtpClient.Send(message);
                }
            }

            //SEND COPY TO CLIENT
            using (var message = new MailMessage())
            {
                message.To.Add(new MailAddress(Contact.Email));
                message.From = new MailAddress("support@ayanova.com");
                message.Subject = $"Confirmation that your question about AyaNova has been received from {Contact.Company}";
                message.Body = MessageBody;

                using (var smtpClient = new SmtpClient("mail.ayanova.com"))
                {

                    smtpClient.Host = "mail.ayanova.com";
                    smtpClient.Port = 2525;
                    smtpClient.UseDefaultCredentials = false;
                    //NOTE: Do not use the noreply email address to send mail, it crashes the server somehow
                    smtpClient.Credentials = new System.Net.NetworkCredential("webmaster@ayanova.com", "c63c17add818fca81cae71a241ea1b552675a86280b7e7e45d36cbf2e8f3bc0e");
                    smtpClient.Send(message);
                }
            }

        }

        public void OnGet()
        {
            Message = "Your contact page.";
        }



        public static bool ReCaptchaPassed(string gRecaptchaResponse, string secret)
        {
            HttpClient httpClient = new HttpClient();
            var res = httpClient.GetAsync($"https://www.google.com/recaptcha/api/siteverify?secret={secret}&response={gRecaptchaResponse}").Result;
            if (res.StatusCode != HttpStatusCode.OK)
            {
                // logger.LogError("Error while sending request to ReCaptcha");
                return false;
            }

            string JSONres = res.Content.ReadAsStringAsync().Result;
            dynamic JSONdata = JObject.Parse(JSONres);
            if (JSONdata.success != "true")
            {
                return false;
            }

            return true;
        }


    }
}