Reverted removal of Jdk7HttpProxySocket to retain JDK 7 support for H…

…TTP CONNECT

src/main/java/com/hierynomus/sshj/backport/Jdk7HttpProxySocket.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.hierynomus.sshj.backport;
+
+import net.schmizz.sshj.common.IOUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.*;
+
+public class Jdk7HttpProxySocket extends Socket {
+
+    private Proxy httpProxy = null;
+
+    public Jdk7HttpProxySocket(Proxy proxy) {
+        super(proxy.type() == Proxy.Type.HTTP ? Proxy.NO_PROXY : proxy);
+        if (proxy.type() == Proxy.Type.HTTP) {
+            this.httpProxy = proxy;
+        }
+    }
+
+    @Override
+    public void connect(SocketAddress endpoint, int timeout) throws IOException {
+        if (httpProxy != null) {
+            connectHttpProxy(endpoint, timeout);
+        } else {
+            super.connect(endpoint, timeout);
+        }
+    }
+
+    private void connectHttpProxy(SocketAddress endpoint, int timeout) throws IOException {
+        super.connect(httpProxy.address(), timeout);
+
+        if (!(endpoint instanceof InetSocketAddress)) {
+            throw new SocketException("Expected an InetSocketAddress to connect to, got: " + endpoint);
+        }
+        InetSocketAddress isa = (InetSocketAddress) endpoint;
+        String httpConnect = "CONNECT " + isa.getHostName() + ":" + isa.getPort() + " HTTP/1.0\n\n";
+        getOutputStream().write(httpConnect.getBytes(IOUtils.UTF8));
+        checkAndFlushProxyResponse();
+    }
+
+    private void checkAndFlushProxyResponse()throws IOException {
+        InputStream socketInput = getInputStream();
+        byte[] tmpBuffer = new byte[512];
+        int len = socketInput.read(tmpBuffer, 0, tmpBuffer.length);
+
+        if (len == 0) {
+            throw new SocketException("Empty response from proxy");
+        }
+
+        String proxyResponse = new String(tmpBuffer, 0, len, IOUtils.UTF8);
+
+        // Expecting HTTP/1.x 200 OK
+        if (proxyResponse.contains("200")) {
+            // Flush any outstanding message in buffer
+            if (socketInput.available() > 0) {
+                socketInput.skip(socketInput.available());
+            }
+            // Proxy Connect Successful
+        } else {
+            throw new SocketException("Fail to create Socket\nResponse was:" + proxyResponse);
+        }
+    }
+}