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