using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace VirusCheckTester
{
	class Program
	{
		static void Main(string[] args)
		{
			try
			{
				// Create temp file
				string tmpFileName = Path.GetTempFileName();

				Console.WriteLine(string.Format("Step 1: Creating test file with EICAR virus text in it. File = {0}", tmpFileName));

				// Write EICAR virus test text to file
				using (StreamWriter outfile = new StreamWriter(tmpFileName))
				{
					outfile.Write(@"X5O!P%@AP[4\PZX54(P^)7CC)7}");
					outfile.Write(@"$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*");
				}

				Console.WriteLine("Step 2: Virus EICAR file created.");				

				// Virus detection check
				Console.WriteLine("Step 3: Determining if EICAR virus was detected by opening test file.");
				VirusCheck(tmpFileName, tmpFileName);
				Console.WriteLine("Step 4: Test file was successfully opened. EICAR virus was not detected!");
			}
			catch(Exception exc)
			{
				Console.WriteLine(exc.ToString());
			}
		}

		public static void VirusCheck(
			string serverFilename,
			string clientFilename)
		{
			try
			{
				// Attempt to open the file.
				using(FileStream tmpFileStream = new FileStream(serverFilename, FileMode.Open))
				{
				}
			}
			catch(Exception exc)
			{
				// Treat any encountered error as the content containing a virus. All other possible errors would 
				// be severe errors which would manifest in other areas. For example: a disk full condition would
				// trigger a server error, an access denied error would be caught on first content virus check during 
				// testing, etc.
				throw new Exception(
					string.Format("The file open failed because a virus was detected in the content. Filename: '{0}'", clientFilename),
					exc);
			}
		}
	}
}