122 lines
5.0 KiB
Java
122 lines
5.0 KiB
Java
// SPDX-License-Identifier: GPL-3.0-only
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/*
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* Prism Launcher - Minecraft Launcher
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* Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Linking this library statically or dynamically with other modules is
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* making a combined work based on this library. Thus, the terms and
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* conditions of the GNU General Public License cover the whole
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* combination.
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*
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* As a special exception, the copyright holders of this library give
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* you permission to link this library with independent modules to
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* produce an executable, regardless of the license terms of these
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* independent modules, and to copy and distribute the resulting
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* executable under terms of your choice, provided that you also meet,
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* for each linked independent module, the terms and conditions of the
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* license of that module. An independent module is a module which is
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* not derived from or based on this library. If you modify this
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* library, you may extend this exception to your version of the
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* library, but you are not obliged to do so. If you do not wish to do
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* so, delete this exception statement from your version.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.prismlauncher.utils;
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import java.io.IOException;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.reflect.Method;
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import java.net.Proxy;
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import java.net.URL;
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import java.net.URLConnection;
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import java.net.URLStreamHandler;
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import org.prismlauncher.utils.logging.Log;
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/**
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* A utility class for URLs which uses reflection to access hidden methods.
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* Unfortunately not supported on newer Java versions.
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*/
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public final class UrlUtils {
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private static URLStreamHandler http;
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private static MethodHandle openConnection;
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private static MethodHandle openConnectionProxied;
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static {
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try {
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// invoke URL.getURLStreamHandler to obtain some of the default handlers before
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// they are overridden
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Method getURLStreamHandler = URL.class.getDeclaredMethod("getURLStreamHandler", String.class);
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getURLStreamHandler.setAccessible(true);
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http = (URLStreamHandler) getURLStreamHandler.invoke(null, "http");
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// reflection is required due to not having access
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// unreflect is used due to the potential frequency of calls
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Method openConnectionReflect = URLStreamHandler.class.getDeclaredMethod("openConnection", URL.class);
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openConnectionReflect.setAccessible(true);
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openConnection = MethodHandles.lookup().unreflect(openConnectionReflect);
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// a second method which takes in a proxy is required for a fully-functional
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// URLStreamHandler
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Method openConnectionReflectProxied = URLStreamHandler.class.getDeclaredMethod("openConnection", URL.class,
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Proxy.class);
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openConnectionReflectProxied.setAccessible(true);
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openConnectionProxied = MethodHandles.lookup().unreflect(openConnectionReflectProxied);
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} catch (Throwable e) {
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Log.error("URL reflection failed - some features may not work", e);
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}
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}
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/**
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* Determines whether all the features of this class are available.
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*
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* @return <code>true</code> if all features can be used
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*/
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public static boolean isSupported() {
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return http != null && openConnection != null && openConnectionProxied != null;
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}
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public static URLConnection openHttpConnection(URL url) throws IOException {
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return openConnection(http, url);
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}
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public static URLConnection openHttpConnection(URL url, Proxy proxy) throws IOException {
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return openConnection(http, url, proxy);
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}
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public static URLConnection openConnection(URLStreamHandler handler, URL url) throws IOException {
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try {
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return (URLConnection) openConnection.invokeExact(handler, url);
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} catch (IOException | Error | RuntimeException e) {
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throw e; // rethrow if possible
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} catch (Throwable e) {
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throw new Error(e); // otherwise, wrap in Error
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}
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}
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public static URLConnection openConnection(URLStreamHandler handler, URL url, Proxy proxy) throws IOException {
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try {
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return (URLConnection) openConnectionProxied.invokeExact(handler, url, proxy);
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} catch (IOException | Error | RuntimeException e) {
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throw e;
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} catch (Throwable e) {
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throw new Error(e);
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}
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}
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}
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