EnvelopeGenerator/EnvelopeGenerator.Web/Controllers/Test/TestLocalizerController.cs

using AngleSharp.Common;
using DigitalData.Core.API;
using EnvelopeGenerator.Application.Resources;
using EnvelopeGenerator.Web.Extensions;
using EnvelopeGenerator.Web.Models;
using Microsoft.AspNetCore.Localization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Localization;
using System.Globalization;

namespace EnvelopeGenerator.Web.Controllers.Test
{
    [ApiController]
    [Route("api/test/[controller]")]
    public class TestLocalizerController : ControllerBase
    {
        private readonly IStringLocalizer _localizer;
        private readonly MultiCulture _cultures;

        public TestLocalizerController(IStringLocalizer<Resource> localizer, MultiCulture cultures)
        {
            _localizer = localizer;
            _cultures = cultures;
        }

        [HttpGet("{key}")]
        public IActionResult Localize([FromRoute] string key) => Ok(_localizer[key]);

        [HttpGet("fi-class")]
        public IActionResult GetFIClass(string? lang = null) => lang is null ? Ok(_cultures.FIClasses) : Ok(_cultures[lang]?.FIClass);

        [HttpGet("culture")]
        public IActionResult GetCultures(string? lang = null) => lang is null ? Ok(_cultures) : Ok(_cultures[lang]);

        [HttpGet("culture/accept-language")]
        public IActionResult GetCultureByAcceptLanguage()
            => HttpContext.GetCultureByAcceptLanguage()?.Name is string culture 
            ? Ok(culture)
            : NotFound();

        [HttpGet("culture/user")]
        public IActionResult GetUserCulture() => Request.Cookies.GetCulture() is string cult ? Ok(cult) : NotFound();
    }
}