Drop main arguments --proxyHost, --proxyPort, --proxyUser, --proxyPass

src/main/java/moe/yushi/authlibinjector/AuthlibInjector.java

@@ -56,6 +56,7 @@ import moe.yushi.authlibinjector.transform.support.ConstantURLTransformUnit;
 import moe.yushi.authlibinjector.transform.support.MC52974Workaround;
 import moe.yushi.authlibinjector.transform.support.MC52974_1710Workaround;
 import moe.yushi.authlibinjector.transform.support.MainArgumentsTransformer;
+import moe.yushi.authlibinjector.transform.support.ProxyParameterWorkaround;
 import moe.yushi.authlibinjector.transform.support.SkinWhitelistTransformUnit;
 import moe.yushi.authlibinjector.transform.support.YggdrasilKeyTransformUnit;
 import moe.yushi.authlibinjector.yggdrasil.CustomYggdrasilAPIProvider;
@@ -90,6 +91,7 @@ public final class AuthlibInjector {
 		classTransformer = createTransformer(apiMetadata);
 		instrumentation.addTransformer(classTransformer, retransformSupported);
 
+		ProxyParameterWorkaround.init();
 		MC52974Workaround.init();
 		MC52974_1710Workaround.init();
 	}

src/main/java/moe/yushi/authlibinjector/transform/support/MainArgumentsTransformer.java

@@ -75,12 +75,13 @@ public class MainArgumentsTransformer implements TransformUnit {
 
 	@CallbackMethod
 	public static String[] processMainArguments(String[] args) {
-		log(DEBUG, "Main arguments: " + Stream.of(args).collect(joining(" ")));
+		log(DEBUG, "Original main arguments: " + Stream.of(args).collect(joining(" ")));
 
 		String[] result = args;
 		for (Function<String[], String[]> listener : ARGUMENTS_LISTENERS) {
 			result = listener.apply(result);
 		}
+		log(DEBUG, "Transformed main arguments: " + Stream.of(result).collect(joining(" ")));
 		return result;
 	}
 

src/main/java/moe/yushi/authlibinjector/transform/support/ProxyParameterWorkaround.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2020  Haowei Wen <yushijinhun@gmail.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package moe.yushi.authlibinjector.transform.support;
+
+import static moe.yushi.authlibinjector.util.Logging.log;
+import static moe.yushi.authlibinjector.util.Logging.Level.WARNING;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+public final class ProxyParameterWorkaround {
+	private ProxyParameterWorkaround() {}
+
+	private static final Set<String> PROXY_PARAMETERS = new HashSet<>(Arrays.asList(
+			"--proxyHost", "--proxyPort", "--proxyUser", "--proxyPass"
+	));
+
+	public static void init() {
+		MainArgumentsTransformer.getArgumentsListeners().add(args -> {
+			boolean proxyDetected = false;
+			List<String> filtered = new ArrayList<>();
+			for (int i = 0; i < args.length; i++) {
+				if (i + 1 < args.length && PROXY_PARAMETERS.contains(args[i])) {
+					proxyDetected = true;
+					log(WARNING, "Dropping main argument " + args[i] + " " + args[i + 1]);
+					i++;
+					continue;
+				}
+				filtered.add(args[i]);
+			}
+			if (proxyDetected) {
+				log(WARNING, "--proxyHost parameter conflicts with authlib-injector, therefore proxy is disabled.");
+			}
+			return filtered.toArray(new String[filtered.size()]);
+		});
+	}
+}