net-boot-server/DhcpServer/AppConfigs.cs

using System;
using System.IO;
using Newtonsoft.Json;

namespace DhcpServer
{
    internal static class AppConfigs
    {
        private const string DefaultConfigFileName = "Default.json";

        public static readonly string ConfigFileDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Configs");
        public static readonly string DefaultConfigFilePath = Path.Combine(ConfigFileDir, DefaultConfigFileName);

        public static string GetClientEntryPath(string mac)
        {
            return Path.Combine(ConfigFileDir, mac + ".json");
        }

        public static bool CreateDefaultClientEntryIfNoExist()
        {
            if (File.Exists(DefaultConfigFilePath)) return false;
            if (false == Directory.Exists(ConfigFileDir)) Directory.CreateDirectory(ConfigFileDir);
            File.WriteAllText(DefaultConfigFilePath, JsonConvert.SerializeObject(new ClientEntry(), Formatting.Indented));
            return true;
        }

        public static ClientEntry GetDefaultClientEntry()
        {
            return File.Exists(DefaultConfigFilePath)
                ? JsonConvert.DeserializeObject<ClientEntry>(File.ReadAllText(DefaultConfigFilePath))
                : null;
        }

        public static ClientEntry GetClientEntry(string mac)
        {
            var path = GetClientEntryPath(mac);
            if (File.Exists(path)) return JsonConvert.DeserializeObject<ClientEntry>(File.ReadAllText(path));

            var createNew = new ClientEntry();
            File.WriteAllText(path, JsonConvert.SerializeObject(new ClientEntry(), Formatting.Indented));
            return createNew;
        }
    }
}