fix: allow pre/post-2024.3 proxy settings (#242)

Signed-off-by: Andre Dietisheim <[email protected]>

src/main/java/com/redhat/devtools/intellij/common/utils/IdeProxyAdapter.java

@@ -0,0 +1,355 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Red Hat, Inc.
+ * Distributed under license by Red Hat, Inc. All rights reserved.
+ * This program is made available under the terms of the
+ * Eclipse Public License v2.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v20.html
+ *
+ * Contributors:
+ * Red Hat, Inc. - initial API and implementation
+ ******************************************************************************/
+package com.redhat.devtools.intellij.common.utils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+import java.net.Authenticator;
+import java.net.InetAddress;
+import java.net.PasswordAuthentication;
+import java.net.Proxy;
+import java.net.ProxySelector;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class IdeProxyAdapter {
+
+    public static ProxySelector getProxySelector() {
+        ProxySelector selector = Pre243.getProxySelector();
+        if (selector != null) {
+            return selector;
+        } else {
+            return Post243.getProxySelector();
+        }
+    }
+
+    public static Authenticator getAuthenticator() {
+        Authenticator authenticator = Pre243.getAuthenticator();
+        if (authenticator != null) {
+            return authenticator;
+        } else {
+            return Post243.getAuthenticator();
+        }
+    }
+
+    /**
+     *
+     * Returns the proxies that exist for the given url.
+     *
+     * @param url the url to get proxies for
+     * @return the proxies for the given url
+     *
+     */
+    public static List<Proxy> getProxies(String url) {
+        List<Proxy> proxies = Pre243.getProxies(url);
+        if (proxies != null
+                && !proxies.isEmpty()) {
+            return proxies;
+        } else {
+            return Post243.getProxies(url);
+        }
+    }
+
+    public static PasswordAuthentication getPasswordAuthentication() {
+        PasswordAuthentication authentication = Pre243.getPasswordAuthentication();
+        if (authentication != null) {
+            return authentication;
+        } else {
+            return Post243.getPasswordAuthentication();
+        }
+    }
+
+    private static class Pre243 {
+
+        static ProxySelector getProxySelector() {
+            Object httpConfigurable = httpConfigurable_getInstance();
+            if (httpConfigurable == null) {
+                return null;
+            }
+            return (ProxySelector) ideaWideProxySelector_newInstance(httpConfigurable);
+        }
+
+        /**
+         * <code>
+         *  new IdeaWideAuthenticator(HttpConfigurable)
+         * </code>
+         */
+        static Authenticator getAuthenticator() {
+            Object httpConfigurable = httpConfigurable_getInstance();
+            if (httpConfigurable == null) {
+                return null;
+            }
+            return (Authenticator) ideaWideAuthenticator_newInstance(httpConfigurable);
+        }
+
+        static List<Proxy> getProxies(String url) {
+            List<Proxy> proxies = new ArrayList<>();
+            try {
+                Object httpConfigurable = httpConfigurable_getInstance();
+                if (httpConfigurable != null) {
+                    Object ideaWideProxySelector = ideaWideProxySelector_newInstance(httpConfigurable);
+                    if (ideaWideProxySelector != null) {
+                        proxies = ideaWideProxySelector_select(ideaWideProxySelector, new URI(url));
+                    }
+                }
+            } catch (URISyntaxException e) {
+                // swallow only
+            }
+            return proxies;
+        }
+
+        /**
+         * <code>
+         *  new IdeaWideAuthenticator(HttpConfigurable.getInstance()).getPasswordAuthentication()
+         * </code>
+         */
+        static private PasswordAuthentication getPasswordAuthentication() {
+            PasswordAuthentication authentication = null;
+            Object httpConfigurable = httpConfigurable_getInstance();
+            if (httpConfigurable != null) {
+                authentication = httpConfigurable_getPromptedAuthentication("*", httpConfigurable);
+            }
+            return authentication;
+        }
+
+        /**
+         * <code>
+         *  IdeaWideProxySelector.select(URI)
+         * </code>
+         */
+        @SuppressWarnings("unchecked")
+        private static List<Proxy> ideaWideProxySelector_select(Object ideaWideProxySelector, URI uri) {
+            try {
+                Method method = ideaWideProxySelector.getClass().getDeclaredMethod("select", URI.class);
+                return (List<Proxy>) method.invoke(ideaWideProxySelector, uri);
+            } catch (ReflectiveOperationException | IllegalArgumentException e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *  new IdeaWideProxySelector()
+         * </code>
+         */
+        @SuppressWarnings("JavaReflectionMemberAccess")
+        private static Object ideaWideProxySelector_newInstance(Object httpConfigurable) {
+            try {
+                Class<?> clazz = Class.forName("com.intellij.util.net.IdeaWideProxySelector");
+                Constructor<?> constructor = clazz.getConstructor(httpConfigurable.getClass());
+                return constructor.newInstance(httpConfigurable);
+            } catch (ReflectiveOperationException | IllegalArgumentException e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *  new IdeaWideAuthenticator(HttpConfigurable)
+         * </code>
+         */
+        @SuppressWarnings("JavaReflectionMemberAccess")
+        private static Object ideaWideAuthenticator_newInstance(Object httpConfigurable) {
+            try {
+                Class<?> clazz = Class.forName("com.intellij.util.net.IdeaWideAuthenticator");
+                Constructor<?> constructor = clazz.getConstructor(httpConfigurable.getClass());
+                return constructor.newInstance(httpConfigurable);
+            } catch (Exception e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *  HttpConfigurable.getPromptedAuthentication(String host, String prompt)
+         * </code>
+         */
+        private static PasswordAuthentication httpConfigurable_getPromptedAuthentication(String url, Object httpConfigurable) {
+            try {
+                Method method = httpConfigurable.getClass().getMethod("getPromptedAuthentication", String.class, String.class);
+                return (PasswordAuthentication) method.invoke(httpConfigurable, url, null);
+            } catch (Exception e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *  HttpConfigurable.getInstance()
+         * </code>
+         */
+        private static Object httpConfigurable_getInstance() {
+            try {
+                Class<?> clazz = Class.forName("com.intellij.util.net.HttpConfigurable");
+                Method getInstanceMethod = clazz.getDeclaredMethod("getInstance");
+                return getInstanceMethod.invoke(null);
+            } catch (ReflectiveOperationException e) {
+                return null;
+            }
+        }
+    }
+
+    private static class Post243 {
+
+        /**
+         * <code>
+         *  JdkProxyProvider.getInstance().getProxySelector()
+         * </code>
+         */
+        static ProxySelector getProxySelector() {
+            Object provider = jdkProxyProvider_getInstance();
+            if (provider == null) {
+                return null;
+            }
+            return (ProxySelector) jdkProxyProvider_getProxySelector(provider);
+        }
+
+        /**
+         * <code>
+         *  JdkProxyProvider.getInstance().getAuthenticator()
+         * </code>
+         */
+        public static Authenticator getAuthenticator() {
+            Object proxyAuthentication = jdkProxyProvider_getInstance();
+            if (proxyAuthentication == null) {
+                return null;
+            }
+            return (Authenticator) jdkProxyProvider_getAuthenticator(proxyAuthentication);
+        }
+
+        /**
+         * <code>
+         *  JdkProxyProvider.getInstance().getProxySelector().select(URI.create(url))
+         * </code>
+         */
+        static List<Proxy> getProxies(String url) {
+            List<Proxy> proxies = new ArrayList<>();
+            try {
+                ProxySelector selector = getProxySelector();
+                if (selector != null) {
+                    proxies = proxySelector_select(selector, new URI(url));
+                }
+            } catch (Exception e) {
+                // swallow only
+            }
+            return proxies;
+        }
+
+        /**
+         * <code>
+         *  JdkProxyProvider.getInstance().getAuthenticator().requestPasswordAuthentication(
+         *      null,
+         *      0,
+         *      null,
+         *      null,
+         *      null
+         *  );
+         * </code>
+         */
+        private static PasswordAuthentication getPasswordAuthentication() {
+            PasswordAuthentication authentication = null;
+            Object provider = jdkProxyProvider_getInstance();
+            if (provider != null) {
+                Object authenticator = jdkProxyProvider_getAuthenticator(provider);
+                if (authenticator != null) {
+                    authentication = authenticator_requestPasswordAuthentication(authenticator);
+                }
+            }
+            return authentication;
+        }
+
+        /**
+         * <code>
+         *  ProxySelector.select(URI)
+         * <code>
+         */
+        @SuppressWarnings("unchecked")
+        private static List<Proxy> proxySelector_select(Object proxySelector, URI uri) {
+            try {
+                Method method = proxySelector.getClass().getDeclaredMethod("select", URI.class);
+                method.setAccessible(true);
+                return (List<Proxy>) method.invoke(proxySelector, uri);
+            } catch (Exception e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *  Authenticator.requestPasswordAuthentication(InetAddress addr, int port, String protocol, String prompt, String scheme)
+         * </code>
+         */
+        private static PasswordAuthentication authenticator_requestPasswordAuthentication(Object authenticator) {
+            try {
+                Method method = authenticator.getClass().getMethod("requestPasswordAuthentication",
+                        InetAddress.class,
+                        Integer.TYPE,
+                        String.class,
+                        String.class,
+                        String.class);
+                return (PasswordAuthentication) method.invoke(authenticator,
+                        null,
+                        0,
+                        null,
+                        null,
+                        null
+                );
+            } catch (Exception e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *     JdkProxyProvider.getProxySelector()
+         * </code>
+         */
+        private static Object jdkProxyProvider_getProxySelector(Object jdkProxyProvider) {
+            try {
+                Method getInstanceMethod = jdkProxyProvider.getClass().getDeclaredMethod("getProxySelector");
+                return getInstanceMethod.invoke(jdkProxyProvider);
+            } catch (Exception e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *  JdkProxyProvider.getAuthenticator()
+         * </code>
+         */
+        private static Object jdkProxyProvider_getAuthenticator(Object jdkProxyProvider) {
+            try {
+                Method getAuthenticatorMethod = jdkProxyProvider.getClass().getDeclaredMethod("getAuthenticator");
+                return getAuthenticatorMethod.invoke(jdkProxyProvider);
+            } catch (Exception e) {
+                return null;
+            }
+        }
+
+        /**
+         * <code>
+         *  JdkProxyProvider.getInstance()
+         * </code>
+         */
+        private static Object jdkProxyProvider_getInstance() {
+            try {
+                Class<?> clazz = Class.forName("com.intellij.util.net.JdkProxyProvider");
+                Method getInstanceMethod = clazz.getDeclaredMethod("getInstance");
+                return getInstanceMethod.invoke(null);
+            } catch (Exception e) {
+                return null;
+            }
+        }
+    }
+}