feat(auth): add register

src/RookieShop.IdentityService/Pages/Account/Login/Index.cshtml

@@ -46,6 +46,7 @@
 
                             <button class="btn btn-primary" name="Input.Button" value="login">Login</button>
                             <button class="btn btn-secondary" name="Input.Button" value="cancel">Cancel</button>
+                            <button class="btn btn-secondary" name="Input.Button" value="register">Register</button>
                         </form>
                     </div>
                 </div>

src/RookieShop.IdentityService/Pages/Account/Login/Index.cshtml.cs

@@ -45,6 +45,9 @@ public async Task<IActionResult> OnPost()
         // check if we are in the context of an authorization request
         var context = await interaction.GetAuthorizationContextAsync(Input.ReturnUrl);
 
+        if (Input.Button == "register")
+            return RedirectToPage("/Account/Register/Index", new { returnUrl = Input.ReturnUrl });
+
         // the user clicked the "cancel" button
         if (Input.Button != "login")
         {
@@ -136,7 +139,7 @@ private async Task BuildModelAsync(string? returnUrl)
 
             Input.Username = context.LoginHint;
 
-            if (!local) View.ExternalProviders = new[] { new ViewModel.ExternalProvider(context.IdP) };
+            if (!local) View.ExternalProviders = [new(context.IdP)];
 
             return;
         }

src/RookieShop.IdentityService/Pages/Account/Login/ViewModel.cs

@@ -8,7 +8,7 @@ public sealed class ViewModel
     public bool AllowRememberLogin { get; set; } = true;
     public bool EnableLocalLogin { get; set; } = true;
 
-    public IEnumerable<ExternalProvider> ExternalProviders { get; set; } = Enumerable.Empty<ExternalProvider>();
+    public IEnumerable<ExternalProvider> ExternalProviders { get; set; } = [];
 
     public IEnumerable<ExternalProvider> VisibleExternalProviders =>
         ExternalProviders.Where(x => !string.IsNullOrWhiteSpace(x.DisplayName));

src/RookieShop.IdentityService/Pages/Account/Register/Index.cshtml

@@ -0,0 +1,49 @@
+@page
+@model RookieShop.IdentityService.Pages.Account.Register.Index
+
+<div class="register-page">
+    <div class="lead">
+        <h1>Create a new account</h1>
+    </div>
+
+    <partial name="_ValidationSummary"/>
+
+    <form asp-page="/Account/Register/Index">
+        <input type="hidden" asp-for="Input.ReturnUrl"/>
+        <div class="form-group">
+            <label asp-for="Input.Username" class="col-md-2 control-label">Username</label>
+            <div class="col-md-10">
+                <input asp-for="Input.Username" placeholder="example@gmail.com" class="form-control" autofocus/>
+                <span asp-validation-for="Input.Username" class="text-danger"></span>
+            </div>
+        </div>
+        <div class="form-group">
+            <label asp-for="Input.PhoneNumber" class="col-md-2 control-label">Confirm Password</label>
+            <div class="col-md-10">
+                <input asp-for="Input.PhoneNumber" placeholder="0123456789" class="form-control"/>
+                <span asp-validation-for="Input.PhoneNumber" class="text-danger"></span>
+            </div>
+        </div>
+        <div class="form-group">
+            <label asp-for="Input.Password" class="col-md-2 control-label">Password</label>
+            <div class="col-md-10">
+                <input asp-for="Input.Password" class="form-control"/>
+                <span asp-validation-for="Input.Password" class="text-danger"></span>
+            </div>
+        </div>
+        <div class="form-group">
+            <label asp-for="Input.ConfirmPassword" class="col-md-2 control-label">Confirm Password</label>
+            <div class="col-md-10">
+                <input asp-for="Input.ConfirmPassword" class="form-control"/>
+                <span asp-validation-for="Input.ConfirmPassword" class="text-danger"></span>
+            </div>
+        </div>
+        <div class="form-group">
+            <div class="col-md-offset-2 col-md-10">
+                <button class="btn btn-primary" name="Input.Button" value="register">Register</button>
+                <button class="btn btn-secondary" name="Input.Button" value="cancel">Cancel</button>
+            </div>
+        </div>
+    </form>
+
+</div>

src/RookieShop.IdentityService/Pages/Account/Register/Index.cshtml.cs

@@ -0,0 +1,66 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using RookieShop.IdentityService.Models;
+
+namespace RookieShop.IdentityService.Pages.Account.Register;
+
+[SecurityHeaders]
+[AllowAnonymous]
+public sealed class Index(UserManager<ApplicationUser> userManager) : PageModel
+{
+    [BindProperty] public InputModel Input { get; set; } = default!;
+
+    public async Task<IActionResult> OnGet(string? returnUrl)
+    {
+        Input = new()
+        {
+            ReturnUrl = returnUrl
+        };
+
+        return Page();
+    }
+
+    public async Task<IActionResult> OnPost()
+    {
+        if (Input.Button != "register")
+            return RedirectToPage("/Account/Login/Index", new { returnUrl = Input.ReturnUrl });
+
+        if (!ModelState.IsValid)
+            return Page();
+
+        if (Input.Username is null || Input.Password is null || Input.PhoneNumber is null)
+            return Page();
+
+        var user = await userManager.FindByNameAsync(Input.Username);
+
+        if (user is not null)
+        {
+            ModelState.AddModelError("Username", "Username is already taken");
+            return Page();
+        }
+
+        user = new()
+        {
+            UserName = Input.Username,
+            PhoneNumber = Input.PhoneNumber
+        };
+
+        var result = await userManager.CreateAsync(user, Input.Password);
+
+        if (!result.Succeeded)
+        {
+            foreach (var error in result.Errors)
+            {
+                ModelState.AddModelError(string.Empty, error.Description);
+            }
+
+            return Page();
+        }
+
+        await userManager.AddToRoleAsync(user, "user");
+
+        return RedirectToPage("/Account/Login/Index", new { returnUrl = Input.ReturnUrl });
+    }
+}

src/RookieShop.IdentityService/Pages/Account/Register/InputModel.cs

@@ -0,0 +1,29 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace RookieShop.IdentityService.Pages.Account.Register;
+
+public sealed class InputModel
+{
+    [Required]
+    [EmailAddress]
+    [MaxLength(50)]
+    public string? Username { get; set; }
+
+    [Required]
+    [RegularExpression(@"^\d{8,16}$", ErrorMessage = "Phone number must be 8-16 digits.")]
+    public string? PhoneNumber { get; set; }
+
+    [Required]
+    [RegularExpression(@"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,15}$",
+        ErrorMessage =
+            "Password must be 8-15 characters and contain at least one uppercase letter, one lowercase letter, and one digit.")]
+    public string? Password { get; set; }
+
+    [Required]
+    [Compare(nameof(Password))]
+    public string? ConfirmPassword { get; set; }
+
+    public string? ReturnUrl { get; set; }
+
+    public string? Button { get; set; }
+}