Automatic Updater & Downloader of updates for BungeeTheAPI (Proxy version)

# AUTOMATIC UPDATER & DOWNLOADER OF BUNGEE-THEAPI
# Our discord: https://discord.gg/8YtfC234dA

public void onLoad() {
    downloadAndUpdate();
}

public static void downloadAndUpdate() {
    if(ProxyServer.getInstance().getPluginManager().getPlugin("BungeeTheAPI")==null) {
        try {
            HttpURLConnection conn = (HttpURLConnection)new URL("https://api.spiget.org/v2/resources/87143/download").openConnection();
            conn.setRequestProperty("User-Agent", "DevTec-JavaClient");
            conn.setRequestProperty("Accept-Encoding", "gzip");
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(20000);
            conn.setReadTimeout(20000);
            conn.connect();
            File f = new File("plugins/BungeeTheAPI.jar");
            if(!f.exists()) {
                f.getParentFile().mkdirs();
                f.createNewFile();
            }
            ReadableByteChannel rbc = Channels.newChannel(conn.getInputStream());
            FileOutputStream fos = new FileOutputStream(f);
            fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
            fos.close();
            rbc.close();
            //load TheAPI
            File file = new File("plugins/BungeeTheAPI.jar");
            try (JarFile jar = new JarFile(file)) {
              JarEntry pdf = jar.getJarEntry("bungee.yml");
              if (pdf == null)
                pdf = jar.getJarEntry("plugin.yml");
              try (InputStream in = jar.getInputStream(pdf)) {
                PluginDescription desc = (PluginDescription)((Yaml)Ref.get(ProxyServer.getInstance().getPluginManager(), "yaml")).loadAs(in, PluginDescription.class);
                desc.setFile(file);
                if (!(boolean)Ref.invoke(ProxyServer.getInstance().getPluginManager(), Ref.method(PluginManager.class, "enablePlugin", Map.class, Stack.class, PluginDescription.class), new HashMap<>(), new Stack<>(), desc))
                    ProxyServer.getInstance().getLogger().log(Level.WARNING, "Failed to enable {0}", desc.getName());
                else {
                    Plugin plugin = ProxyServer.getInstance().getPluginManager().getPlugin("BungeeTheAPI");
                    try {
                        plugin.onEnable();
                        ProxyServer.getInstance().getLogger().log(Level.INFO, "Enabled plugin {0} version {1} by {2}", new Object[] { plugin.getDescription().getName(), plugin.getDescription().getVersion(), plugin.getDescription().getAuthor() });
                      } catch (Throwable t) {
                        ProxyServer.getInstance().getLogger().log(Level.WARNING, "Exception encountered when loading plugin: " + plugin.getDescription().getName(), t);
                      }
                }
              }
            } catch (Exception ex) {
              ProxyServer.getInstance().getLogger().log(Level.WARNING, "Could not load plugin from file " + file, ex);
            }
        }catch(Exception e) {

        }
    } //else download update if needed
    else {
        try {
            if(new SpigotUpdateChecker(ProxyServer.getInstance().getPluginManager().getPlugin("BukkitTheAPI").getDescription().getVersion(), 87143).checkForUpdates()==Version.NEW) {
                try {
                    HttpURLConnection conn = (HttpURLConnection)new URL("https://api.spiget.org/v2/resources/87143/download").openConnection();
                    conn.setRequestProperty("User-Agent", "DevTec-JavaClient");
                    conn.setRequestProperty("Accept-Encoding", "gzip");
                    conn.setRequestMethod("GET");
                    conn.setConnectTimeout(20000);
                    conn.setReadTimeout(20000);
                    conn.connect();
                    File f = new File("plugins/update/BungeeTheAPI.jar");
                    if(!f.exists()) {
                        f.getParentFile().mkdirs();
                        f.createNewFile();
                    }
                    ReadableByteChannel rbc = Channels.newChannel(conn.getInputStream());
                    FileOutputStream fos = new FileOutputStream(f);
                    fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
                    fos.close();
                    rbc.close();
                }catch(Exception e) {

                }
            }
        }catch(Exception e) {

        }
    }
}

public static String fromStream(InputStream stream) {
    try {
        BufferedReader br = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8), 8192);
        StringBuilder sb = new StringBuilder(512);
        String content;
        while ((content = br.readLine()) != null)
            sb.append(content).append(System.lineSeparator());
        br.close();
        return sb.toString();
    } catch (Exception e) {
        return null;
    }
}