using Microsoft.JSInterop;

​

namespace MyProject.Utils

{

    public interface ICookie

    {

        public Task SetValue(string key, string value, int? days = null);

        public Task<string> GetValue(string key, string def = "");

    }

​

    public class Cookie : ICookie

    {

        readonly IJSRuntime JSRuntime;

        string expires = "";

​

        public Cookie(IJSRuntime jsRuntime)

        {

            JSRuntime = jsRuntime;

            ExpireDays = 300;

        }

​

        public async Task SetValue(string key, string value, int? days = null)

        {

            var curExp = (days != null) ? (days > 0 ? DateToUTC(days.Value) : "") : expires;

            await SetCookie($"{key}={value}; expires={curExp}; path=/");

        }

​

        public async Task<string> GetValue(string key, string def = "")

        {

            var cValue = await GetCookie();

            if (string.IsNullOrEmpty(cValue)) return def;                

​

            var vals = cValue.Split(';');

            foreach (var val in vals)

                if(!string.IsNullOrEmpty(val) && val.IndexOf('=') > 0)

                    if(val.Substring(1, val.IndexOf('=') - 1).Trim().Equals(key, StringComparison.OrdinalIgnoreCase))

                        return val.Substring(val.IndexOf('=') + 1);

            return def;

        }

​

        private async Task SetCookie(string value)

        {

            await JSRuntime.InvokeVoidAsync("eval", $"document.cookie = \"{value}\"");

        }

​

        private async Task<string> GetCookie()

        {

            return await JSRuntime.InvokeAsync<string>("eval", $"document.cookie");

        }

​

        public int ExpireDays

        {

            set => expires = DateToUTC(value);

        }

​

        private static string DateToUTC(int days) => DateTime.Now.AddDays(days).ToUniversalTime().ToString("R");

    }

}