public async Task<IActionResult> Index(ConsentInputModel model)
        {
            // parse the return URL back to an AuthorizeRequest object
            var request = await _interaction.GetAuthorizationContextAsync(model.ReturnUrl);
            ConsentResponse response = null;

            // user clicked 'no' - send back the standard 'access_denied' response
            if (model.Button == "no")
            {
                response = ConsentResponse.Denied;
            }
            // user clicked 'yes' - validate the data
            else if (model.Button == "yes" && model != null)
            {
                // if the user consented to some scope, build the response model
                if (model.ScopesConsented != null && model.ScopesConsented.Any())
                {
                    response = new ConsentResponse
                    {
                        RememberConsent = model.RememberConsent,
                        ScopesConsented = model.ScopesConsented
                    };
                }
                else
                {
                    ModelState.AddModelError("", "You must pick at least one permission.");
                }
            }
            else
            {
                ModelState.AddModelError("", "Invalid Selection");
            }

            if (response != null)
            {
                // communicate outcome of consent back to identityserver
                await _interaction.GrantConsentAsync(request, response);

                // redirect back to authorization endpoint
                return Redirect(model.ReturnUrl);
            }

            var vm = await BuildViewModelAsync(model.ReturnUrl, model);
            if (vm != null)
            {
                return View("Index", vm);
            }

            return View("Error");
        }
        public ConsentViewModel(ConsentInputModel model, string returnUrl, AuthorizationRequest request, Client client, Resources resources)
        {
            RememberConsent = model?.RememberConsent ?? true;
            ScopesConsented = model?.ScopesConsented ?? Enumerable.Empty<string>();

            ReturnUrl = returnUrl;

            ClientName = client.ClientName;
            ClientUrl = client.ClientUri;
            ClientLogoUrl = client.LogoUri;
            AllowRememberConsent = client.AllowRememberConsent;

            IdentityScopes = resources.IdentityResources.Select(x => new ScopeViewModel(x, ScopesConsented.Contains(x.Name) || model == null)).ToArray();
            ResourceScopes = resources.ApiResources.SelectMany(x=>x.Scopes).Select(x => new ScopeViewModel(x, ScopesConsented.Contains(x.Name) || model == null)).ToArray();
            if (resources.OfflineAccess)
            {
                ResourceScopes = ResourceScopes.Union(new ScopeViewModel[] {
                    ScopeViewModel.GetOfflineAccess(ScopesConsented.Contains(IdentityServerConstants.StandardScopes.OfflineAccess) || model == null)
                });
            }
        }
        async Task<ConsentViewModel> BuildViewModelAsync(string returnUrl, ConsentInputModel model = null)
        {
            var request = await _interaction.GetAuthorizationContextAsync(returnUrl);
            if (request != null)
            {
                var client = await _clientStore.FindEnabledClientByIdAsync(request.ClientId);
                if (client != null)
                {
                    var resources = await _resourceStore.FindEnabledResourcesByScopeAsync(request.ScopesRequested);
                    if (resources != null && (resources.IdentityResources.Any() || resources.ApiResources.Any()))
                    {
                        return new ConsentViewModel(model, returnUrl, request, client, resources);
                    }
                    else
                    {
                        _logger.LogError("No scopes matching: {0}", request.ScopesRequested.Aggregate((x, y) => x + ", " + y));
                    }
                }
                else
                {
                    _logger.LogError("Invalid client id: {0}", request.ClientId);
                }
            }
            else
            {
                _logger.LogError("No consent request matching request: {0}", returnUrl);
            }

            return null;
        }