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package com.earth2me.essentials;
import static com.earth2me.essentials.I18n.tl;
import java.io.*;
import java.math.BigInteger;
import java.security.DigestInputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import net.ess3.api.IEssentials;
import org.bukkit.Bukkit;
public class ManagedFile
{
private static final int BUFFERSIZE = 1024 * 8;
private final transient File file;
public ManagedFile(final String filename, final IEssentials ess)
{
file = new File(ess.getDataFolder(), filename);
if (file.exists())
{
try
{
if (checkForVersion(file, ess.getDescription().getVersion()) && !file.delete())
{
throw new IOException("Could not delete file " + file.toString());
}
}
catch (IOException ex)
{
Bukkit.getLogger().log(Level.SEVERE, ex.getMessage(), ex);
}
}
if (!file.exists())
{
try
{
copyResourceAscii("/" + filename, file);
}
catch (IOException ex)
{
Bukkit.getLogger().log(Level.SEVERE, tl("itemsCsvNotLoaded"), ex);
}
}
}
public static void copyResourceAscii(final String resourceName, final File file) throws IOException
{
final InputStreamReader reader = new InputStreamReader(ManagedFile.class.getResourceAsStream(resourceName));
try
{
final MessageDigest digest = getDigest();
final DigestOutputStream digestStream = new DigestOutputStream(new FileOutputStream(file), digest);
try
{
final OutputStreamWriter writer = new OutputStreamWriter(digestStream);
try
{
final char[] buffer = new char[BUFFERSIZE];
do
{
final int length = reader.read(buffer);
if (length >= 0)
{
writer.write(buffer, 0, length);
}
else
{
break;
}
}
while (true);
writer.write("\n");
writer.flush();
final BigInteger hashInt = new BigInteger(1, digest.digest());
digestStream.on(false);
digestStream.write('#');
digestStream.write(hashInt.toString(16).getBytes());
}
finally
{
writer.close();
}
}
finally
{
digestStream.close();
}
}
finally
{
reader.close();
}
}
public static boolean checkForVersion(final File file, final String version) throws IOException
{
if (file.length() < 33)
{
return false;
}
final BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
try
{
final byte[] buffer = new byte[(int)file.length()];
int position = 0;
do
{
final int length = bis.read(buffer, position, Math.min((int)file.length() - position, BUFFERSIZE));
if (length < 0)
{
break;
}
position += length;
}
while (position < file.length());
final ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
if (bais.skip(file.length() - 33) != file.length() - 33)
{
return false;
}
final BufferedReader reader = new BufferedReader(new InputStreamReader(bais));
try
{
String hash = reader.readLine();
if (hash != null && hash.matches("#[a-f0-9]{32}"))
{
hash = hash.substring(1);
bais.reset();
final String versionline = reader.readLine();
if (versionline != null && versionline.matches("#version: .+"))
{
final String versioncheck = versionline.substring(10);
if (!versioncheck.equalsIgnoreCase(version))
{
bais.reset();
final MessageDigest digest = getDigest();
final DigestInputStream digestStream = new DigestInputStream(bais, digest);
try
{
final byte[] bytes = new byte[(int)file.length() - 33];
digestStream.read(bytes);
final BigInteger correct = new BigInteger(hash, 16);
final BigInteger test = new BigInteger(1, digest.digest());
if (correct.equals(test))
{
return true;
}
else
{
Bukkit.getLogger().warning("File " + file.toString() + " has been modified by user and file version differs, please update the file manually.");
}
}
finally
{
digestStream.close();
}
}
}
}
}
finally
{
reader.close();
}
}
finally
{
bis.close();
}
return false;
}
public static MessageDigest getDigest() throws IOException
{
try
{
return MessageDigest.getInstance("MD5");
}
catch (NoSuchAlgorithmException ex)
{
throw new IOException(ex);
}
}
public List<String> getLines()
{
try
{
final BufferedReader reader = new BufferedReader(new FileReader(file));
try
{
final List<String> lines = new ArrayList<String>();
do
{
final String line = reader.readLine();
if (line == null)
{
break;
}
else
{
lines.add(line);
}
}
while (true);
return lines;
}
finally
{
reader.close();
}
}
catch (IOException ex)
{
Bukkit.getLogger().log(Level.SEVERE, ex.getMessage(), ex);
return Collections.emptyList();
}
}
}
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