MVC Authentication

/* Authentication: Viewmodels */

public class VMChangePassword
{
    [DisplayName("User name")]
    public string Username { get; set; }
    [DisplayName("Password")]
    public string Password { get; set; }
    [DisplayName("Confirm Password")]
    public string Password2 { get; set; }
}

public class VMLogin
{
    [DisplayName("User name")]
    public string Username { get; set; }
    [DisplayName("Password")]
    public string Password { get; set; }
    [DisplayName("Stay Signed-in")]
    public bool StaySignedIn { get; set; }
    public string? RedirectUrl { get; set; }
}

public class VMRegister
{
    [DisplayName("User name")]
    public string Username { get; set; }
    [DisplayName("E-mail")]
    public string Email { get; set; }
    [DisplayName("Confirm e-mail")]
    public string Email2 { get; set; }
    [DisplayName("First name")]
    public string FirstName { get; set; }
    [DisplayName("Last name")]
    public string LastName { get; set; }
    [DisplayName("Password")]
    public string Password { get; set; }
    [DisplayName("Repeat password")]
    public string Password2 { get; set; }
}

public class VMValidateEmail
{
    public string Email { get; set; }
    public string SecurityToken { get; set; }
}

/* Authentication: index action */
public IActionResult Index()
{
    return View();
}

/* Authentication: Index.cshtml view */
<a asp-action="register" class="btn btn-outline-primary">Register</a>
<a asp-action="validateEmail" asp-route-email="test@test.info" class="btn btn-outline-primary">Validate E-mail</a>
<a asp-action="login" class="btn btn-outline-primary">Login</a>
<form asp-action="logout">
    <button type="submit" class="btn btn-outline-primary">Logout</button>
</form>
<a asp-action="changepassword" class="btn btn-outline-primary">Change Password</a>

/* Authentication: register actions */
public IActionResult Register()
{
    return View();
}

[HttpPost]
public IActionResult Register(VMRegister register)
{
    if(!ModelState.IsValid)
        return View(register);

    // TODO: Save user to database

    return RedirectToAction("Index");
}

/* Authentication: Register.cshtml view */
@using Task12.Models.User;
@model VMRegister
@{
}
<form asp-action="Register">
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Username" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="text" asp-for="Username" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Username" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Email" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="text" asp-for="Email" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Email" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Email2" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="text" asp-for="Email2" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Email2" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="FirstName" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="text" asp-for="FirstName" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="FirstName" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="LastName" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="text" asp-for="LastName" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="LastName" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Password" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="password" asp-for="Password" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Password" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Password2" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="password" asp-for="Password2" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Password2" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3">
        <div class="col-2"></div>
        <div class="col-3">
            <input type="submit" value="Register" class="btn btn-primary" />
        </div>
    </div>
</form>
@section Scripts {
    @{
        await Html.RenderPartialAsync("_ValidationScriptsPartial");
    }
}

/* Authentication: validate e-mail action */
public IActionResult ValidateEmail(VMValidateEmail validateEmail)
{
    // TODO: Update user: e-mail validated

    return View(validateEmail);
}

/* Authentication: ValidateEmail.cshtml view */
@using Task12.Models.User;
@model VMValidateEmail
@{
}
<h2>Thank you @Model?.Email</h2>
<div>Your e-mail has been validated. You may login now.</div>

/* Authentication: login actions */
public IActionResult Login()
{
    return View();
}

[HttpPost]
public IActionResult Login(VMLogin login)
{
    if (!ModelState.IsValid)
        return View(login);

    // TODO: Check user credentials

    if(login.RedirectUrl != null)
        return Redirect(login.RedirectUrl);
    else
        return RedirectToAction("Login");
}

/* Authentication: Login.cshtml view */
@using Task12.Models.User;
@model VMLogin
@{
}
<form asp-action="Login">
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Username" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="text" asp-for="Username" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Username" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Password" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="password" asp-for="Password" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Password" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="StaySignedIn" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <div class="form-check form-switch">
                <input type="checkbox" asp-for="StaySignedIn" class="form-check-input">
            </div>
        </div>
        <div class="col-3">
        </div>
    </div>
    <div class="row g-3">
        <div class="col-2"></div>
        <div class="col-3">
            <input type="hidden" asp-for="RedirectUrl" class="form-check-input">
            <input type="submit" value="Login" class="btn btn-primary" />
        </div>
    </div>
</form>
@section Scripts {
    @{
        await Html.RenderPartialAsync("_ValidationScriptsPartial");
    }
}

/* Authentication: logout action */
[HttpPost]
public IActionResult Logout()
{
    if (!ModelState.IsValid)
        return View();

    // TODO: Logout user

    return RedirectToAction("Login");
}

/* Authentication: change password actions */
public IActionResult ChangePassword()
{
    return View();
}

[HttpPost]
public IActionResult ChangePassword(VMChangePassword changePassword)
{
    if (!ModelState.IsValid)
        return View(changePassword);

    // TODO: Change user password

    return RedirectToAction("Index");
}

/* Authentication: ChangePassword.cshtml view */
@using Task12.Models.User;
@model VMChangePassword
@{
}
<form asp-action="ChangePassword">
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Username" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="text" asp-for="Username" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Username" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Password" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="password" asp-for="Password" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Password" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3 align-items-center">
        <div class="col-2">
            <label asp-for="Password2" class="col-form-label"></label>
        </div>
        <div class="col-3">
            <input type="password" asp-for="Password2" class="form-control">
        </div>
        <div class="col-3">
            <span asp-validation-for="Password2" class="text-danger"></span>
        </div>
    </div>
    <div class="row g-3">
        <div class="col-2"></div>
        <div class="col-3">
            <input type="submit" value="Change password" class="btn btn-primary" />
        </div>
    </div>
</form>
@section Scripts {
    @{
        await Html.RenderPartialAsync("_ValidationScriptsPartial");
    }
}