﻿/*
 The MIT License (MIT)

Copyright (c) 2015 Microsoft Corporation

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
// The following using statements were added for this sample.
using System.Collections.Concurrent;
using System.Security.Claims;
using TodoListService.Models;

namespace TodoListService.Controllers
{
    [Authorize]
    public class TodoListController : ApiController
    {
        //
        // To Do items list for all users.  Since the list is stored in memory, it will go away if the service is cycled.
        //
        static ConcurrentBag<TodoItem> todoBag = new ConcurrentBag<TodoItem>();

        // GET api/todolist
        public IEnumerable<TodoItem> Get()
        {
            ValidateAppRole();

            // A user's To Do list is keyed off of the NameIdentifier claim, which contains an immutable, unique identifier for the user.
            Claim subject = ClaimsPrincipal.Current.FindFirst(ClaimTypes.NameIdentifier);

            return from todo in todoBag
                   where todo.Owner == subject.Value
                   select todo;
        }

        // POST api/todolist
        public void Post(TodoItem todo)
        {
            ValidateAppRole();

            if (todo != null && !string.IsNullOrWhiteSpace(todo.Title))
            {
                todoBag.Add(new TodoItem { Title = todo.Title, Owner = ClaimsPrincipal.Current.FindFirst(ClaimTypes.NameIdentifier).Value });
            }
        }

        private void ValidateAppRole()
        {
            //
            // The `role` claim tells you what permissions the client application has in the service.
            // In this case we look for a `role` value of `access_as_application`
            //
            Claim scopeClaim = ClaimsPrincipal.Current.FindFirst("roles");
            if (scopeClaim == null || (scopeClaim.Value != "access_as_application"))
            {
                throw new HttpResponseException(new HttpResponseMessage { StatusCode = HttpStatusCode.Unauthorized, ReasonPhrase = "The 'roles' claim does not contain 'access_as_application'or was not found" });
            }
        }
    }
}
