EnvelopeGenerator/EnvelopeGenerator.Web/Extensions/WebExtensions.cs

using EnvelopeGenerator.Application.Common.Dto.EnvelopeReceiver;
using EnvelopeGenerator.Application.Common.Dto.Receiver;
using EnvelopeGenerator.Web.Models;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.AspNetCore.Localization;
using Microsoft.AspNetCore.Mvc;
using System.Globalization;
using System.Security.Claims;

namespace EnvelopeGenerator.Web.Extensions;

public static class WebExtensions
{
    #region Auth
    public static string? GetClaimValue(this ClaimsPrincipal user, string claimType) => user.FindFirstValue(claimType);

    public static string? GetAuthEnvelopeUuid(this ClaimsPrincipal user) => user.FindFirstValue(ClaimTypes.NameIdentifier);

    public static string? GetAuthReceiverSignature(this ClaimsPrincipal user) => user.FindFirstValue(ClaimTypes.Hash);

    public static string? GetAuthReceiverName(this ClaimsPrincipal user) => user.FindFirstValue(ClaimTypes.Name);

    public static string? GetAuthReceiverMail(this ClaimsPrincipal user) => user.FindFirstValue(ClaimTypes.Email);

    public static string? GetAuthEnvelopeTitle(this ClaimsPrincipal user) => user.FindFirstValue(EnvelopeClaimTypes.Title);

    public static int? GetAuthEnvelopeId(this ClaimsPrincipal user)
    {
        var env_id_str = user.FindFirstValue(EnvelopeClaimTypes.Id);
        return int.TryParse(env_id_str, out int env_id) ? env_id : null;
    }
    
    public static async Task SignInEnvelopeAsync(this HttpContext context, EnvelopeReceiverDto er, string receiverRole)
    {
        var claims = new List<Claim> {
        new(ClaimTypes.NameIdentifier, er.Envelope!.Uuid),
        new(ClaimTypes.Hash, er.Receiver!.Signature),
        new(ClaimTypes.Name, er.Name ?? string.Empty),
        new(ClaimTypes.Email, er.Receiver.EmailAddress),
        new(EnvelopeClaimTypes.Title, er.Envelope.Title),
        new(EnvelopeClaimTypes.Id, er.Envelope.Id.ToString()),
        new(ClaimTypes.Role, receiverRole)
    };

        var claimsIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);

        var authProperties = new AuthenticationProperties
        {
            AllowRefresh = false,
            IsPersistent = false
        };

        await context.SignInAsync(
            CookieAuthenticationDefaults.AuthenticationScheme,
            new ClaimsPrincipal(claimsIdentity),
            authProperties);
    }
    #endregion

    #region Cookie
    public static string? GetCulture(this IRequestCookieCollection cookies)
    {
        if (cookies[CookieRequestCultureProvider.DefaultCookieName] is string cookieValue)
            return CookieRequestCultureProvider.ParseCookieValue(cookieValue)?.Cultures.FirstOrDefault().Value;
        else
            return null;
    }

    public static string GetCultureOrDefault(this IRequestCookieCollection cookies) => GetCulture(cookies) ?? CultureInfo.CurrentCulture.Name;

    public static void SetCulture(this IResponseCookies cookies, string culture)
    {
        var cookieOptions = new CookieOptions
        {
            Secure = false,
            SameSite = SameSiteMode.Strict,
            HttpOnly = true
        };
        cookies.Append(
            CookieRequestCultureProvider.DefaultCookieName,
            CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(culture)),
            cookieOptions);
    }
    #endregion

    #region View error
    //TODO: integrate localizer for ready-to-use views
    //TODO: integrate to global exception handler middleware
    public static ViewResult ViewError(this Controller controller, ErrorViewModel errorViewModel) => controller.View("_Error", errorViewModel);

    public static ViewResult ViewError404(this Controller controller) => controller.ViewError(new()
    {
        Title = "404",
        Subtitle = "Die von Ihnen gesuchte Seite ist nicht verfügbar",
        Body = "Sie können derzeit nur an Sie gerichtete Briefe einsehen und unterschreiben.",
    });

    public static ViewResult ViewEnvelopeNotFound(this Controller controller) => controller.ViewError(new()
    {
        Title = "404",
        Subtitle = "Document not found",
        Body = "Wenn Sie diese URL in Ihrer E-Mail erhalten haben, wenden Sie sich bitte an das IT-Team."
    });

    public static ViewResult ViewDocumentNotFound(this Controller controller) => controller.ViewError(new()
    {
        Title = "404",
        Subtitle = "Umschlag nicht gefunden",
        Body = "Wenn Sie diese URL in Ihrer E-Mail erhalten haben, wenden Sie sich bitte an das IT-Team."
    });

		public static ViewResult ViewAccessCodeNotSent(this Controller controller) => controller.ViewError(new()
		{
			Title = "500",
			Subtitle = "Der Zugangscode konnte nicht gesendet werden",
			Body = "Bitte kontaktieren Sie das IT-Team."
		});

		public static ViewResult ViewInnerServiceError(this Controller controller) => controller.ViewError(new()
    {
        Title = "500",
        Subtitle = "Ein unerwarteter Fehler ist aufgetreten",
        Body = "Bitte kontaktieren Sie das IT-Team."
    });
    #endregion

    #region HttpContext
    public static CultureInfo? GetCultureByAcceptLanguage(this HttpContext context)
    {
        var acceptLanguage = context.Request.Headers.AcceptLanguage.ToString();
        if (string.IsNullOrWhiteSpace(acceptLanguage))
            return null;

        foreach (var value in acceptLanguage.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
        {
            var cultureName = value.Split(';', 2)[0];
            if (string.IsNullOrWhiteSpace(cultureName))
                continue;

            try
            {
                return new CultureInfo(cultureName);
            }
            catch (CultureNotFoundException)
            {
                // ignore invalid cultures and continue
            }
        }

        return null;
    }
    #endregion
}