Add U2f Login Support (#787)

* init u2f

* ux fixes

* Cleanup Manage Controller

* final changes

* remove logs

* remove console log

* fix text for u2f

* Use Is Secure instead of IsHttps

* add some basic u2f tests

* move loaders to before title

* missing commit

* refactor after nicolas wtf moment

BTCPayServer/Controllers/ManageController.U2F.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Threading.Tasks;
+using BTCPayServer.Models;
+using BTCPayServer.Services.U2F.Models;
+using Microsoft.AspNetCore.Mvc;
+
+namespace BTCPayServer.Controllers
+{
+    public partial class ManageController
+    {
+        [HttpGet]
+        public async Task<IActionResult> U2FAuthentication(string statusMessage = null)
+        {
+            return View(new U2FAuthenticationViewModel()
+            {
+                StatusMessage = statusMessage,
+                Devices = await _u2FService.GetDevices(_userManager.GetUserId(User))
+            });
+        }
+
+        [HttpGet]
+        public async Task<IActionResult> RemoveU2FDevice(string id)
+        {
+            await _u2FService.RemoveDevice(id, _userManager.GetUserId(User));
+            return RedirectToAction("U2FAuthentication", new
+            {
+                StatusMessage = "Device removed"
+            });
+        }
+
+        [HttpGet]
+        public IActionResult AddU2FDevice(string name)
+        {
+            if (!_btcPayServerEnvironment.IsSecure)
+            {
+                return RedirectToAction("U2FAuthentication", new
+                {
+                    StatusMessage = new StatusMessageModel()
+                    {
+                        Severity = StatusMessageModel.StatusSeverity.Error,
+                        Message = "Cannot register U2F device while not on https or tor"
+                    }
+                });
+            }
+
+            var serverRegisterResponse = _u2FService.StartDeviceRegistration(_userManager.GetUserId(User),
+                Request.GetAbsoluteUriNoPathBase().ToString().TrimEnd('/'));
+
+            return View(new AddU2FDeviceViewModel()
+            {
+                AppId = serverRegisterResponse.AppId,
+                Challenge = serverRegisterResponse.Challenge,
+                Version = serverRegisterResponse.Version,
+                Name = name
+            });
+        }
+
+        [HttpPost]
+        public async Task<IActionResult> AddU2FDevice(AddU2FDeviceViewModel viewModel)
+        {
+            try
+            {
+                if (await _u2FService.CompleteRegistration(_userManager.GetUserId(User), viewModel.DeviceResponse,
+                    string.IsNullOrEmpty(viewModel.Name) ? "Unlabelled U2F Device" : viewModel.Name))
+                {
+                    return RedirectToAction("U2FAuthentication", new
+                    {
+                        StatusMessage = "Device added!"
+                    });
+                }
+
+                throw new Exception("Could not add device.");
+            }
+            catch (Exception e)
+            {
+                return RedirectToAction("U2FAuthentication", new
+                {
+                    StatusMessage = new StatusMessageModel()
+                    {
+                        Severity = StatusMessageModel.StatusSeverity.Error,
+                        Message = e.Message
+                    }
+                });
+            }
+        }
+    }
+}