package com.earth2me.essentials.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 transient URLConnection connection; private transient 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."); } } }