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package net.ess3.update;
import java.io.*;
import java.math.BigInteger;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.logging.Level;
import org.bukkit.Bukkit;
public class GetFile
{
private URLConnection connection;
private MessageDigest digest;
public GetFile(final String urlString) throws MalformedURLException, IOException
{
this(new URL(urlString));
}
public GetFile(final URL url) throws IOException
{
this.connection = url.openConnection();
this.connection.setConnectTimeout(1000);
this.connection.setReadTimeout(5000);
this.connection.setUseCaches(false);
this.connection.connect();
final int respCode = ((HttpURLConnection)this.connection).getResponseCode();
if (respCode >= 300 && respCode < 400 && this.connection.getHeaderField("Location") != null)
{
connection.getInputStream().close();
final URL redirect = new URL(this.connection.getHeaderField("Location"));
this.connection = redirect.openConnection();
this.connection.setConnectTimeout(1000);
this.connection.setReadTimeout(5000);
this.connection.setUseCaches(false);
this.connection.connect();
}
}
public void saveTo(final File file) throws IOException
{
try
{
saveTo(file, null);
}
catch (NoSuchAlgorithmException ex)
{
throw new RuntimeException(ex);
}
}
public void saveTo(final File file, final String key) throws IOException, NoSuchAlgorithmException
{
if (key != null)
{
digest = MessageDigest.getInstance("SHA256");
}
final byte[] buffer = new byte[1024 * 8];
boolean brokenFile = false;
final BufferedInputStream input = new BufferedInputStream(connection.getInputStream());
try
{
final BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream(file));
try
{
int length;
do
{
length = input.read(buffer);
if (length >= 0)
{
if (key != null)
{
digest.update(buffer, 0, length);
}
output.write(buffer, 0, length);
}
}
while (length >= 0);
if (key != null)
{
final byte[] checksum = digest.digest();
final String checksumString = new BigInteger(checksum).toString(36);
if (!checksumString.equals(key))
{
brokenFile = true;
}
}
}
finally
{
output.close();
}
if (brokenFile && !file.delete())
{
Bukkit.getLogger().log(Level.SEVERE, "Could not delete file {0}", file.getPath());
}
}
finally
{
input.close();
}
if (brokenFile)
{
throw new IOException("Checksum check failed.");
}
}
}
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