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package com.earth2me.essentials.update;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.X509EncodedKeySpec;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.bukkit.Bukkit;
import org.bukkit.plugin.Plugin;
import org.bukkit.configuration.file.YamlConfiguration;
public class UpdateFile
{
private final static Logger LOGGER = Bukkit.getLogger();
private final static String UPDATE_URL = "http://goo.gl/67jev";
private final static BigInteger PUBLIC_KEY = new BigInteger("5ha6a2d4qdy17ttkg8evh74sl5a87djojwenu12k1lvy8ui6003e6l06rntczpoh99mhc3txj8mqlxw111oyy9yl7s7qpyluyzix3j1odxrxx4u52gxvyu6qiteapczkzvi7rxgeqsozz7b19rdx73a7quo9ybwpz1cr82r7x5k0pg2a73pjjsv2j1awr13azo7klrcxp9y5xxwf5qv1s3tw4zqftli18u0ek5qkbzfbgk1v5n2f11pkwwk6p0mibrn26wnjbv11vyiqgu95o7busmt6vf5q7grpcenl637w83mbin56s3asj1131b2mscj9xep3cbj7la9tgsxl5bj87vzy8sk2d34kzwqdqgh9nry43nqqus12l1stmiv184r8r3jcy8w43e8h1u1mzklldb5eytkuhayqik8l3ns04hwt8sgacvw534be8sx26qrn5s1", 36);
private final transient File file;
private transient YamlConfiguration updateConfig;
private final transient Plugin plugin;
private final transient TreeMap<Version, VersionInfo> versions = new TreeMap<Version, VersionInfo>();
public UpdateFile(final Plugin plugin)
{
this.plugin = plugin;
final long lastUpdate = Long.parseLong(plugin.getConfig().getString("lastupdate", "0"));
file = new File(plugin.getDataFolder(), "update.yml");
if (lastUpdate < System.currentTimeMillis() - 1000 * 60 * 60 * 6 || !file.exists())
{
if (file.exists() && !file.delete())
{
LOGGER.log(Level.SEVERE, "Could not delete file update.yml!");
return;
}
if (!downloadFile() || !checkFile())
{
LOGGER.log(Level.SEVERE, "Could not download and verify file update.yml!");
return;
}
}
try
{
readVersions();
}
catch (Exception ex)
{
LOGGER.log(Level.SEVERE, "Could not load update.yml!");
return;
}
}
private boolean downloadFile()
{
GetFile getFile;
try
{
getFile = new GetFile(UPDATE_URL);
getFile.saveTo(file);
plugin.getConfig().set("lastupdate", System.currentTimeMillis());
plugin.getConfig().save(new File(plugin.getDataFolder(),"config.yml"));
return true;
}
catch (IOException ex)
{
LOGGER.log(Level.SEVERE, "Error while downloading update.yml", ex);
return false;
}
}
private boolean checkFile()
{
BufferedInputStream bis = null;
try
{
bis = new BufferedInputStream(new FileInputStream(file));
if (bis.read() != '#')
{
throw new IOException("File has to start with #");
}
final StringBuilder length = new StringBuilder();
final StringBuilder signature = new StringBuilder();
boolean isSignature = false;
do
{
final int cur = bis.read();
if (cur == -1)
{
break;
}
if (cur == ':')
{
isSignature = true;
}
else if (cur == '\n')
{
break;
}
else if ((cur >= '0' && cur <= '9')
|| (cur >= 'a' && cur <= 'z'))
{
if (isSignature)
{
signature.append((char)cur);
}
else
{
length.append((char)cur);
}
}
else
{
throw new IOException("Illegal character in signature!");
}
}
while (true);
if (length.length() == 0 || signature.length() == 0)
{
throw new IOException("Broken signature!");
}
final int sigLength = new BigInteger(length.toString(), 36).intValue();
if (sigLength < 0 || sigLength > 2048)
{
throw new IOException("Invalid signature length!");
}
final byte[] sigBytes = new BigInteger(signature.toString(), 36).toByteArray();
if (sigLength < sigBytes.length)
{
throw new IOException("Length is less then available bytes.");
}
byte[] realBytes;
if (sigLength == sigBytes.length)
{
realBytes = sigBytes;
}
else
{
realBytes = new byte[sigLength];
System.arraycopy(sigBytes, 0, realBytes, sigLength - sigBytes.length, sigBytes.length);
}
final X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(PUBLIC_KEY.toByteArray());
final KeyFactory keyFactory = KeyFactory.getInstance("RSA");
final PublicKey pubKey = keyFactory.generatePublic(pubKeySpec);
final Signature rsa = Signature.getInstance("SHA256withRSA");
rsa.initVerify(pubKey);
final byte[] buffer = new byte[2048];
int readLength;
do
{
readLength = bis.read(buffer);
if (readLength >= 0)
{
rsa.update(buffer, 0, readLength);
}
}
while (readLength >= 0);
return rsa.verify(realBytes);
}
catch (Exception ex)
{
LOGGER.log(Level.SEVERE, ex.getMessage(), ex);
}
finally
{
try
{
if (bis != null)
{
bis.close();
}
}
catch (IOException ex)
{
LOGGER.log(Level.SEVERE, ex.getMessage(), ex);
}
}
return false;
}
private void readVersions() throws Exception
{
updateConfig = new YamlConfiguration();
updateConfig.load(file);
versions.clear();
for (String versionString : updateConfig.getKeys(false))
{
final Version version = new Version(versionString);
final VersionInfo info = new VersionInfo(updateConfig, versionString);
versions.put(version, info);
}
}
public Map<Version, VersionInfo> getVersions()
{
return Collections.unmodifiableMap(versions.descendingMap());
}
}
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