btcpayserver/BTCPayServer/Controllers/InvoiceController.cs

using BTCPayServer.Authentication;
using System.Reflection;
using System.Linq;
using Microsoft.Extensions.Logging;
using BTCPayServer.Logging;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using NBitpayClient;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using BTCPayServer.Models;
using Newtonsoft.Json;
using System.Globalization;
using NBitcoin;
using NBitcoin.DataEncoders;
using BTCPayServer.Filters;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using System.Net;
using Microsoft.AspNetCore.Identity;
using Newtonsoft.Json.Linq;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using NBitcoin.Payment;
using BTCPayServer.Data;
using BTCPayServer.Models.InvoicingModels;
using System.Security.Claims;
using BTCPayServer.Services;
using System.ComponentModel.DataAnnotations;
using System.Text.RegularExpressions;
using BTCPayServer.Services.Stores;
using BTCPayServer.Servcices.Invoices;
using BTCPayServer.Services.Rates;
using BTCPayServer.Services.Wallets;
using BTCPayServer.Validations;

using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Mvc.Routing;
using NBXplorer.DerivationStrategy;
using NBXplorer;

namespace BTCPayServer.Controllers
{
	public partial class InvoiceController : Controller
	{
		TokenRepository _TokenRepository;
		InvoiceRepository _InvoiceRepository;
		BTCPayWallet _Wallet;
		IRateProvider _RateProvider;
		private InvoiceWatcher _Watcher;
		StoreRepository _StoreRepository;
		Network _Network;
		UserManager<ApplicationUser> _UserManager;
		IFeeProvider _FeeProvider;
		ExplorerClient _Explorer;

		public InvoiceController(
			Network network,
			InvoiceRepository invoiceRepository,
			UserManager<ApplicationUser> userManager,
			TokenRepository tokenRepository,
			BTCPayWallet wallet,
			IRateProvider rateProvider,
			StoreRepository storeRepository,
			InvoiceWatcher watcher,
			ExplorerClient explorerClient,
			IFeeProvider feeProvider)
		{
			_Explorer = explorerClient ?? throw new ArgumentNullException(nameof(explorerClient));
			_StoreRepository = storeRepository ?? throw new ArgumentNullException(nameof(storeRepository));
			_Network = network ?? throw new ArgumentNullException(nameof(network));
			_TokenRepository = tokenRepository ?? throw new ArgumentNullException(nameof(tokenRepository));
			_InvoiceRepository = invoiceRepository ?? throw new ArgumentNullException(nameof(invoiceRepository));
			_Wallet = wallet ?? throw new ArgumentNullException(nameof(wallet));
			_RateProvider = rateProvider ?? throw new ArgumentNullException(nameof(rateProvider));
			_Watcher = watcher ?? throw new ArgumentNullException(nameof(watcher));
			_UserManager = userManager;
			_FeeProvider = feeProvider ?? throw new ArgumentNullException(nameof(feeProvider));
		}

		private async Task<DataWrapper<InvoiceResponse>> CreateInvoiceCore(Invoice invoice, StoreData store)
		{
			var derivationStrategy = store.DerivationStrategy;
			var entity = new InvoiceEntity
			{
				InvoiceTime = DateTimeOffset.UtcNow,
				DerivationStrategy = derivationStrategy ?? throw new BitpayHttpException(400, "This store has not configured the derivation strategy")
			};
			Uri notificationUri = Uri.IsWellFormedUriString(invoice.NotificationURL, UriKind.Absolute) ? new Uri(invoice.NotificationURL, UriKind.Absolute) : null;
			if(notificationUri == null || (notificationUri.Scheme != "http" && notificationUri.Scheme != "https")) //TODO: Filer non routable addresses ?
				notificationUri = null;
			EmailAddressAttribute emailValidator = new EmailAddressAttribute();
			entity.ExpirationTime = entity.InvoiceTime + TimeSpan.FromMinutes(15.0);
			entity.ServerUrl = HttpContext.Request.GetAbsoluteRoot();
			entity.FullNotifications = invoice.FullNotifications;
			entity.NotificationURL = notificationUri?.AbsoluteUri;
			entity.BuyerInformation = Map<Invoice, BuyerInformation>(invoice);
			//Another way of passing buyer info to support
			FillBuyerInfo(invoice.Buyer, entity.BuyerInformation);

			entity.RefundMail = EmailValidator.IsEmail(entity?.BuyerInformation?.BuyerEmail) ? entity.BuyerInformation.BuyerEmail : null;
			entity.ProductInformation = Map<Invoice, ProductInformation>(invoice);
			entity.RedirectURL = invoice.RedirectURL ?? store.StoreWebsite;
			entity.Status = "new";
			entity.SpeedPolicy = store.SpeedPolicy;
			entity.TxFee = (await _FeeProvider.GetFeeRateAsync()).GetFee(100); // assume price for 100 bytes
			entity.Rate = (double)await _RateProvider.GetRateAsync(invoice.Currency);
			entity.PosData = invoice.PosData;
			entity.DepositAddress = await _Wallet.ReserveAddressAsync(ParseDerivationStrategy(derivationStrategy));

			entity = await _InvoiceRepository.CreateInvoiceAsync(store.Id, entity);
			await _Wallet.MapAsync(entity.DepositAddress.ScriptPubKey, entity.Id);
			await _Watcher.WatchAsync(entity.Id);
			var resp = entity.EntityToDTO();
			return new DataWrapper<InvoiceResponse>(resp) { Facade = "pos/invoice" };
		}

		private void FillBuyerInfo(Buyer buyer, BuyerInformation buyerInformation)
		{
			if(buyer == null)
				return;
			buyerInformation.BuyerAddress1 = buyerInformation.BuyerAddress1 ?? buyer.Address1;
			buyerInformation.BuyerAddress2 = buyerInformation.BuyerAddress2 ?? buyer.Address2;
			buyerInformation.BuyerCity = buyerInformation.BuyerCity ?? buyer.City;
			buyerInformation.BuyerCountry = buyerInformation.BuyerCountry ?? buyer.country;
			buyerInformation.BuyerEmail = buyerInformation.BuyerEmail ?? buyer.email;
			buyerInformation.BuyerName = buyerInformation.BuyerName ?? buyer.Name;
			buyerInformation.BuyerPhone = buyerInformation.BuyerPhone ?? buyer.phone;
			buyerInformation.BuyerState = buyerInformation.BuyerState ?? buyer.State;
			buyerInformation.BuyerZip = buyerInformation.BuyerZip ?? buyer.zip;
		}

		private DerivationStrategyBase ParseDerivationStrategy(string derivationStrategy)
		{
			return new DerivationStrategyFactory(_Network).Parse(derivationStrategy);
		}

		private TDest Map<TFrom, TDest>(TFrom data)
		{
			return JsonConvert.DeserializeObject<TDest>(JsonConvert.SerializeObject(data));
		}
	}
}