Scaffold all ASP.NET Identity pages.

Marechai/Areas/Identity/Pages/Account/Manage/DownloadPersonalData.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Marechai.Database.Models;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Logging;
+
+namespace Marechai.Areas.Identity.Pages.Account.Manage
+{
+    public class DownloadPersonalDataModel : PageModel
+    {
+        readonly ILogger<DownloadPersonalDataModel> _logger;
+        readonly UserManager<ApplicationUser>       _userManager;
+
+        public DownloadPersonalDataModel(UserManager<ApplicationUser> userManager,
+                                         ILogger<DownloadPersonalDataModel> logger)
+        {
+            _userManager = userManager;
+            _logger      = logger;
+        }
+
+        public async Task<IActionResult> OnPostAsync()
+        {
+            ApplicationUser user = await _userManager.GetUserAsync(User);
+
+            if(user == null)
+            {
+                return NotFound($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");
+            }
+
+            _logger.LogInformation("User with ID '{UserId}' asked for their personal data.",
+                                   _userManager.GetUserId(User));
+
+            // Only include personal data for download
+            Dictionary<string, string> personalData = new Dictionary<string, string>();
+
+            IEnumerable<PropertyInfo> personalDataProps = typeof(ApplicationUser).
+                                                          GetProperties().
+                                                          Where(prop =>
+                                                                    Attribute.IsDefined(prop,
+                                                                                        typeof(PersonalDataAttribute)));
+
+            foreach(PropertyInfo p in personalDataProps)
+            {
+                personalData.Add(p.Name, p.GetValue(user)?.ToString() ?? "null");
+            }
+
+            IList<UserLoginInfo> logins = await _userManager.GetLoginsAsync(user);
+
+            foreach(UserLoginInfo l in logins)
+            {
+                personalData.Add($"{l.LoginProvider} external login provider key", l.ProviderKey);
+            }
+
+            Response.Headers.Add("Content-Disposition", "attachment; filename=PersonalData.json");
+
+            return new FileContentResult(JsonSerializer.SerializeToUtf8Bytes(personalData), "application/json");
+        }
+    }
+}