Custom Content Type Permissions in Umbraco 7

create.html

<div class="umb-dialog-body with-footer" ng-controller="Project.ContentCreateController">

	<div class="umb-pane">
		<h5><localize key="create_createUnder">Create a page under</localize> {{currentNode.name}}</h5>

		<p class="abstract" ng-hide="allowedTypes">
			<localize key="create_noDocumentTypes" />
		</p>

		<ul class="umb-actions umb-actions-child">

			<li ng-repeat="docType in allowedTypes | filterDisallowedDocTypes: disallowedTypes | orderBy:'name':false">
				<a href="#content/content/edit/{{currentNode.id}}?doctype={{docType.alias}}&create=true" ng-click="nav.hideNavigation()">

					<i class="large {{docType.icon}}"></i>

					<span class="menu-label">
						{{docType.name}}
						<small>
							{{docType.description}}
						</small>
					</span>
				</a>
			</li>
		</ul>
	</div>
</div>

<div class="umb-dialog-footer btn-toolbar umb-btn-toolbar">
	<button class="btn" ng-click="nav.hideDialog(true)">
		<localize key="buttons_somethingElse">Do something else</localize>
	</button>
</div>

doctypepermissions.js

angular.module('umbraco.services').config([
	'$httpProvider',
	function ($httpProvider) {

		$httpProvider.interceptors.push(function ($q) {
			return {
				'request': function (request) {

					if (request.url.indexOf("views/content/create.html") > -1) {
						request.url = '/App_Plugins/DocTypePermissions/create.html';
					}

					return request || $q.when(request);
				}
			};
		});

	}]);

angular.module('umbraco').filter('filterDisallowedDocTypes', function () {
	return function (input, disallowed) {
		var inputArray = [];

		for (var item in input) {
			inputArray.push(input[item]);
		}

		return inputArray.filter(function (v) { return disallowed.indexOf(v.alias) < 0; });
	};
});

angular.module('umbraco').controller('Project.ContentCreateController',
	['$scope', '$controller', '$http',
		function ($scope, $controller, $http) {
			angular.extend(this, $controller('Umbraco.Editors.Content.CreateController', { $scope: $scope }));

			$http.get("/umbraco/backoffice/api/Permissions/GetDisallowedDocTypes?parentId=" + $scope.currentNode.id).then(function (r) {
				$scope.disallowedTypes = r.data;
			});

		}]);

package.manifest

{
	javascript: [
		"~/App_Plugins/DocTypePermissions/doctypepermissions.js"
	]
}

PermissionsController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Http;
using Umbraco.Core;
using Umbraco.Core.Models;
using Umbraco.Core.Services;
using Umbraco.Web.WebApi;

namespace Project.Controllers
{
    public class PermissionsController : UmbracoAuthorizedApiController
	{
		[HttpGet]
		public List<string> GetDisallowedDocTypes(int parentId)
		{ 
			var listOfAliases = new List<string>();
      
      // do the logic here, to find the content type aliases, that is NOT allowed
      // eg
      listOfAliases.Add("imNotAllowed");
      
      return listOfAliases;
		}

	}
}