UserController.cs

using Coscine.Api.User.Models;
using Coscine.Api.User.ReturnObjects;
using Coscine.ApiCommons;
using Coscine.ApiCommons.Factories;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Linq;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Authorization;

namespace Coscine.Api.User.Controllers
{
    [Authorize]
    public class UserController : Controller
    {
        private readonly Authenticator _authenticator;
        private readonly UserModel _userModel;

        public UserController()
        {
            _authenticator = new Authenticator(this, Program.Configuration);
            _userModel = new UserModel();
        }

        [HttpPost("[controller]/email")]
        public IActionResult ChangeContactMail()
        {
            var user = _authenticator.GetUser();

            UserObject userObject = ObjectFactory<UserObject>.DeserializeFromStream(Request.Body);
            if (new EmailAddressAttribute().IsValid(userObject.EmailAddress))
            {
                user.EmailAddress = userObject.EmailAddress;
                return Ok(_userModel.Update(user));
            }
            else
            {
                throw new FormatException("Incorrect E-Mail format!");
            }
        }

        [HttpGet("[controller]/user")]
        public IActionResult GetUser()
        {
            var user = _authenticator.GetUser();
            return Ok(new UserObject(user.Id, user.DisplayName, user.EmailAddress));
        }

        [HttpGet("[controller]/query/{queryString}/project/{projectId}")]
        public IActionResult Query(string queryString, string projectId)
        {
            var user = _authenticator.GetUser();
            string lowerQueryString = queryString.ToLower();
            Guid.TryParse(projectId, out Guid projectIdGuid);
            ProjectModel projectModel = new ProjectModel();

            if (projectModel.HasAccess(user, projectModel.GetById(projectIdGuid)))
            {
                return Ok(_userModel.GetAllWhere((dbUser) =>
                    (dbUser.DisplayName.ToLower().Contains(lowerQueryString)
                    || dbUser.EmailAddress.ToLower().Contains(lowerQueryString))
                    && !((from projectRole in dbUser.ProjectRolesUserIdIds
                          where projectRole.ProjectId == projectIdGuid
                          select projectRole).Any()))
                        .Take(10)
                        .Select((dbUser) => new UserObject(dbUser.Id, dbUser.DisplayName, null)));
            }
            else
            {
                throw new UnauthorizedAccessException("User is not allowed to query users with respect to given project!");
            }
        }

    }
}