/*
    * Copyright (C) 2013, 2020 Christian Halstrick <christian.halstrick@sap.com> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  package org.eclipse.jgit.transport.http;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.HttpURLConnection;
  import java.net.MalformedURLException;
  import java.net.ProtocolException;
  import java.net.Proxy;
  import java.net.URL;
  import java.security.KeyManagementException;
  import java.security.NoSuchAlgorithmException;
  import java.security.SecureRandom;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  
  import javax.net.ssl.HostnameVerifier;
  import javax.net.ssl.HttpsURLConnection;
  import javax.net.ssl.KeyManager;
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLSocket;
  import javax.net.ssl.TrustManager;
  
  import org.eclipse.jgit.annotations.NonNull;
  import org.eclipse.jgit.internal.transport.http.DelegatingSSLSocketFactory;
  import org.eclipse.jgit.util.HttpSupport;
  /**
   * A {@link org.eclipse.jgit.transport.http.HttpConnection} which simply
   * delegates every call to a {@link java.net.HttpURLConnection}. This is the
   * default implementation used by JGit
   *
   * @since 3.3
   */
  public class JDKHttpConnection implements HttpConnection {
  	HttpURLConnection wrappedUrlConnection;
  
  	// used for mock testing
  	JDKHttpConnection(HttpURLConnection urlConnection) {
  		this.wrappedUrlConnection = urlConnection;
  	}
  
  	/**
  	 * Constructor for JDKHttpConnection.
  	 *
  	 * @param url
  	 *            a {@link java.net.URL} object.
  	 * @throws java.net.MalformedURLException
  	 * @throws java.io.IOException
  	 */
  	protected JDKHttpConnection(URL url)
  			throws MalformedURLException,
  			IOException {
  		this.wrappedUrlConnection = (HttpURLConnection) url.openConnection();
  	}
  
  	/**
  	 * Constructor for JDKHttpConnection.
  	 *
  	 * @param url
  	 *            a {@link java.net.URL} object.
  	 * @param proxy
  	 *            a {@link java.net.Proxy} object.
  	 * @throws java.net.MalformedURLException
  	 * @throws java.io.IOException
  	 */
  	protected JDKHttpConnection(URL url, Proxy proxy)
  			throws MalformedURLException, IOException {
  		this.wrappedUrlConnection = (HttpURLConnection) url
  				.openConnection(proxy);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public int getResponseCode() throws IOException {
  		return wrappedUrlConnection.getResponseCode();
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public URL getURL() {
  		return wrappedUrlConnection.getURL();
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public String getResponseMessage() throws IOException {
  		return wrappedUrlConnection.getResponseMessage();
  	}
  
 	/** {@inheritDoc} */
 	@Override
 	public Map<String, List<String>> getHeaderFields() {
 		return wrappedUrlConnection.getHeaderFields();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setRequestProperty(String key, String value) {
 		wrappedUrlConnection.setRequestProperty(key, value);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setRequestMethod(String method) throws ProtocolException {
 		wrappedUrlConnection.setRequestMethod(method);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setUseCaches(boolean usecaches) {
 		wrappedUrlConnection.setUseCaches(usecaches);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setConnectTimeout(int timeout) {
 		wrappedUrlConnection.setConnectTimeout(timeout);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setReadTimeout(int timeout) {
 		wrappedUrlConnection.setReadTimeout(timeout);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public String getContentType() {
 		return wrappedUrlConnection.getContentType();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public InputStream getInputStream() throws IOException {
 		return wrappedUrlConnection.getInputStream();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public String getHeaderField(@NonNull String name) {
 		return wrappedUrlConnection.getHeaderField(name);
 	}
 
 	@Override
 	public List<String> getHeaderFields(@NonNull String name) {
 		Map<String, List<String>> m = wrappedUrlConnection.getHeaderFields();
 		List<String> fields = mapValuesToListIgnoreCase(name, m);
 		return fields;
 	}
 
 	private static List<String> mapValuesToListIgnoreCase(String keyName,
 			Map<String, List<String>> m) {
 		List<String> fields = new LinkedList<>();
 		m.entrySet().stream().filter(e -> keyName.equalsIgnoreCase(e.getKey()))
 				.filter(e -> e.getValue() != null)
 				.forEach(e -> fields.addAll(e.getValue()));
 		return fields;
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public int getContentLength() {
 		return wrappedUrlConnection.getContentLength();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setInstanceFollowRedirects(boolean followRedirects) {
 		wrappedUrlConnection.setInstanceFollowRedirects(followRedirects);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setDoOutput(boolean dooutput) {
 		wrappedUrlConnection.setDoOutput(dooutput);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setFixedLengthStreamingMode(int contentLength) {
 		wrappedUrlConnection.setFixedLengthStreamingMode(contentLength);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public OutputStream getOutputStream() throws IOException {
 		return wrappedUrlConnection.getOutputStream();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setChunkedStreamingMode(int chunklen) {
 		wrappedUrlConnection.setChunkedStreamingMode(chunklen);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public String getRequestMethod() {
 		return wrappedUrlConnection.getRequestMethod();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public boolean usingProxy() {
 		return wrappedUrlConnection.usingProxy();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void connect() throws IOException {
 		wrappedUrlConnection.connect();
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void setHostnameVerifier(HostnameVerifier hostnameverifier) {
 		((HttpsURLConnection) wrappedUrlConnection)
 				.setHostnameVerifier(hostnameverifier);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public void configure(KeyManager[] km, TrustManager[] tm,
 			SecureRandom random) throws NoSuchAlgorithmException,
 			KeyManagementException {
 		SSLContext ctx = SSLContext.getInstance("TLS"); //$NON-NLS-1$
 		ctx.init(km, tm, random);
 		((HttpsURLConnection) wrappedUrlConnection).setSSLSocketFactory(
 				new DelegatingSSLSocketFactory(ctx.getSocketFactory()) {
 
 					@Override
 					protected void configure(SSLSocket socket)
 							throws IOException {
 						HttpSupport.configureTLS(socket);
 					}
 				});
 	}
 
 }