marechai/cicm_web/Areas/Identity/Pages/Account/Manage/DownloadPersonalData.cshtml.cs

/******************************************************************************
// Canary Islands Computer Museum Website
// ----------------------------------------------------------------------------
//
// Filename       : DownloadPersonalData.cshtml.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// --[ Description ] ----------------------------------------------------------
//
//     ASP.NET Identify management
//
// --[ License ] --------------------------------------------------------------
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as
//     published by the Free Software Foundation, either version 3 of the
//     License, or (at your option) any later version.
//
//     This program is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2003-2018 Natalia Portillo
*******************************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;

namespace cicm_web.Areas.Identity.Pages.Account.Manage
{
    public class DownloadPersonalDataModel : PageModel
    {
        readonly ILogger<DownloadPersonalDataModel> _logger;
        readonly UserManager<IdentityUser>          _userManager;

        public DownloadPersonalDataModel(UserManager<IdentityUser>          userManager,
                                         ILogger<DownloadPersonalDataModel> logger)
        {
            _userManager = userManager;
            _logger      = logger;
        }

        public async Task<IActionResult> OnPostAsync()
        {
            IdentityUser user = await _userManager.GetUserAsync(User);
            if(user == null) return NotFound($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");

            _logger.LogInformation("User with ID '{UserId}' asked for their personal data.",
                                   _userManager.GetUserId(User));

            // Only include personal data for download
            Dictionary<string, string> personalData = new Dictionary<string, string>();
            IEnumerable<PropertyInfo> personalDataProps = typeof(IdentityUser)
                                                         .GetProperties()
                                                         .Where(prop =>
                                                                    Attribute.IsDefined(prop,
                                                                                        typeof(PersonalDataAttribute)));
            foreach(PropertyInfo p in personalDataProps)
                personalData.Add(p.Name, p.GetValue(user)?.ToString() ?? "null");

            Response.Headers.Add("Content-Disposition", "attachment; filename=PersonalData.json");
            return new FileContentResult(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(personalData)),
                                         "text/json");
        }
    }
}