EnvelopeGenerator/EnvelopeGenerator.GeneratorAPI/Controllers/LocalizationController.cs

using DigitalData.Core.API;
using EnvelopeGenerator.Application.Resources;
using Microsoft.AspNetCore.Localization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Localization;

namespace EnvelopeGenerator.GeneratorAPI.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class LocalizationController : ControllerBase
    {
        private static readonly Guid L_KEY = Guid.NewGuid(); 

        private readonly ILogger<LocalizationController> _logger;
        private readonly IStringLocalizer<Resource> _localizer;
        private readonly IMemoryCache _cache; 
        public LocalizationController(ILogger<LocalizationController> logger, IStringLocalizer<Resource> localizer, IMemoryCache memoryCache)
        {
            _logger = logger;
            _localizer = localizer;
            _cache = memoryCache;
        }

        [HttpGet]
        public IActionResult GetAll() => Ok(_cache.GetOrCreate(L_KEY, _ => _localizer.ToDictionary()));

        [HttpGet("lang")]
        public IActionResult GetLanguage() => Language is null ? NotFound() : Ok(Language);

        [HttpPost("lang")]
        public IActionResult SetLanguage([FromQuery] string language)
        {
            if (string.IsNullOrEmpty(language))
                return BadRequest();

            Language = language;
            return Ok();
        }

        [HttpDelete("lang")]
        public IActionResult DeleteLanguage()
        {
            Language = null;
            return Ok();
        }

        private string? Language
        {
            get
            {
                var cookieValue = Request.Cookies[CookieRequestCultureProvider.DefaultCookieName];

                if (string.IsNullOrEmpty(cookieValue))
                    return null;

                var culture = CookieRequestCultureProvider.ParseCookieValue(cookieValue)?.Cultures[0];
                return culture?.Value ?? null;
            }
            set
            {
                if (value is null)
                    Response.Cookies.Delete(CookieRequestCultureProvider.DefaultCookieName);
                else
                {
                    var cookieOptions = new CookieOptions()
                    {
                        Expires = DateTimeOffset.UtcNow.AddYears(1),
                        Secure = false,
                        SameSite = SameSiteMode.Strict,
                        HttpOnly = true
                    };

                    Response.Cookies.Append(
                        CookieRequestCultureProvider.DefaultCookieName,
                        CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(value)),
                        cookieOptions);
                }
            }
        }
    }
}