Account Email Support (#1000)

* Moved the Server Settings out into a button on nav header

* Refactored Mange Users page to the new design (skeleton). Implemented skeleton code for Invite User.

* Hashed out more of the code, but need to move all the email code to a Kavita controlled API server due to password credentials.

* Cleaned up some warnings

* When no user exists for an api key in Plugin controller, throw 401.

* Hooked in the ability to check if the Kavita instance can be accessed externally so we can determine if the user can invite or not.

* Hooked up some logic if the user's server isn't accessible, then default to old flow

* Basic flow is working for confirm email. Needs validation, error handling, etc.

* Refactored Password validation to account service

* Cleaned up the code in confirm-email to work much better.

* Refactored the login page to have a container functionality, so we can reuse the styles on multiple pages (registration pages). Hooked up the code for confirm email.

* Messy code, but making progress. Refactored Register to be used only for first time user registration. Added a new register component to handle first time flow only.

* Invite works much better, still needs a bit of work for non-accessible server setup. Started work on underlying manage users page to meet new design.

* Changed (you) to a star to indicate who you're logged in as.

* Inviting a user is now working and tested fully.

* Removed the register member component as we now have invite and confirm components.

* Editing a user is now working. Username change and Role/Library access from within one screen. Email changing is on hold.

* Cleaned up code for edit user and disabled email field for now.

* Cleaned up the code to indicate changing a user's email is not possible.

* Implemented a migration for existing accounts so they can validate their emails and still login.

* Change url for email server

* Implemented the ability to resend an email confirmation code (or regenerate for non accessible servers). Fixed an overflow on the confirm dialog.

* Took care of some code cleanup

* Removed 3 db calls from cover refresh and some misc cleanup

* Fixed a broken test

API/Services/AccountService.cs

@@ -1,9 +1,12 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using API.Data;
 using API.Entities;
 using API.Errors;
 using Microsoft.AspNetCore.Identity;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 
 namespace API.Services
@@ -11,30 +14,29 @@ namespace API.Services
     public interface IAccountService
     {
         Task<IEnumerable<ApiException>> ChangeUserPassword(AppUser user, string newPassword);
+        Task<IEnumerable<ApiException>> ValidatePassword(AppUser user, string password);
+        Task<IEnumerable<ApiException>> ValidateUsername(string username);
+        Task<IEnumerable<ApiException>> ValidateEmail(string email);
     }
 
     public class AccountService : IAccountService
     {
         private readonly UserManager<AppUser> _userManager;
         private readonly ILogger<AccountService> _logger;
+        private readonly IUnitOfWork _unitOfWork;
         public const string DefaultPassword = "[k.2@RZ!mxCQkJzE";
 
-        public AccountService(UserManager<AppUser> userManager, ILogger<AccountService> logger)
+        public AccountService(UserManager<AppUser> userManager, ILogger<AccountService> logger, IUnitOfWork unitOfWork)
         {
             _userManager = userManager;
             _logger = logger;
+            _unitOfWork = unitOfWork;
         }
 
         public async Task<IEnumerable<ApiException>> ChangeUserPassword(AppUser user, string newPassword)
         {
-            foreach (var validator in _userManager.PasswordValidators)
-            {
-                var validationResult = await validator.ValidateAsync(_userManager, user, newPassword);
-                if (!validationResult.Succeeded)
-                {
-                    return validationResult.Errors.Select(e => new ApiException(400, e.Code, e.Description));
-                }
-            }
+            var passwordValidationIssues = (await ValidatePassword(user, newPassword)).ToList();
+            if (passwordValidationIssues.Any()) return passwordValidationIssues;
 
             var result = await _userManager.RemovePasswordAsync(user);
             if (!result.Succeeded)
@@ -53,5 +55,42 @@ namespace API.Services
 
             return new List<ApiException>();
         }
+
+        public async Task<IEnumerable<ApiException>> ValidatePassword(AppUser user, string password)
+        {
+            foreach (var validator in _userManager.PasswordValidators)
+            {
+                var validationResult = await validator.ValidateAsync(_userManager, user, password);
+                if (!validationResult.Succeeded)
+                {
+                    return validationResult.Errors.Select(e => new ApiException(400, e.Code, e.Description));
+                }
+            }
+
+            return Array.Empty<ApiException>();
+        }
+        public async Task<IEnumerable<ApiException>> ValidateUsername(string username)
+        {
+            if (await _userManager.Users.AnyAsync(x => x.NormalizedUserName == username.ToUpper()))
+            {
+                return new List<ApiException>()
+                {
+                    new ApiException(400, "Username is already taken")
+                };
+            }
+
+            return Array.Empty<ApiException>();
+        }
+
+        public async Task<IEnumerable<ApiException>> ValidateEmail(string email)
+        {
+            var user = await _unitOfWork.UserRepository.GetUserByEmailAsync(email);
+            if (user == null) return Array.Empty<ApiException>();
+
+            return new List<ApiException>()
+            {
+                new ApiException(400, "Email is already registered")
+            };
+        }
     }
 }