Logger.cs

// Copyright 2021-2023 Uwe Gradenegger <uwe@gradenegger.eu>

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

using System.Diagnostics;
using System.Security;
using TameMyCerts.Enums;
using TameMyCerts.Models;

namespace TameMyCerts
{
    internal class Logger
    {
        private readonly EventLog _eventLog;
        private readonly int _logLevel;

        public Logger(string eventSource, int logLevel = CertSrv.CERTLOG_WARNING)
        {
            const string logName = "Application";

            _logLevel = logLevel;

            _eventLog = new EventLog(logName)
            {
                Source = CreateEventSource(eventSource, logName)
            };
        }

        public void Log(Event logEvent, params object[] args)
        {
            if (_logLevel >= logEvent.LogLevel)
            {
                _eventLog.WriteEntry(string.Format(logEvent.MessageText, args), logEvent.Type, logEvent.Id);
            }
        }

        private static string CreateEventSource(string currentAppName, string logName)
        {
            var eventSource = currentAppName;

            try
            {
                if (!EventLog.SourceExists(eventSource))
                {
                    EventLog.CreateEventSource(eventSource, logName);
                }
            }
            catch (SecurityException)
            {
                eventSource = "Application";
            }

            return eventSource;
        }
    }
}