/*
    * Copyright (C) 2017 Thomas Wolf <thomas.wolf@paranor.ch> 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.http.test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.io.IOException;
  import java.util.EnumSet;
  import java.util.List;
  
  import javax.servlet.DispatcherType;
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.eclipse.jetty.servlet.FilterHolder;
  import org.eclipse.jetty.servlet.ServletContextHandler;
  import org.eclipse.jetty.servlet.ServletHolder;
  import org.eclipse.jgit.errors.TransportException;
  import org.eclipse.jgit.errors.UnsupportedCredentialItem;
  import org.eclipse.jgit.http.server.GitServlet;
  import org.eclipse.jgit.junit.TestRepository;
  import org.eclipse.jgit.junit.http.AccessEvent;
  import org.eclipse.jgit.junit.http.AppServer;
  import org.eclipse.jgit.lib.ConfigConstants;
  import org.eclipse.jgit.lib.NullProgressMonitor;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.revwalk.RevBlob;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.transport.CredentialItem;
  import org.eclipse.jgit.transport.CredentialsProvider;
  import org.eclipse.jgit.transport.Transport;
  import org.eclipse.jgit.transport.URIish;
  import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider;
  import org.eclipse.jgit.transport.http.HttpConnectionFactory;
  import org.eclipse.jgit.util.HttpSupport;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  
  @RunWith(Parameterized.class)
  public class SmartClientSmartServerSslTest extends AllFactoriesHttpTestCase {
  
  	// We run these tests with a server on localhost with a self-signed
  	// certificate. We don't do authentication tests here, so there's no need
  	// for username and password.
  	//
  	// But the server certificate will not validate. We know that Transport will
  	// ask whether we trust the server all the same. This credentials provider
  	// blindly trusts the self-signed certificate by answering "Yes" to all
  	// questions.
  	private CredentialsProvider testCredentials = new CredentialsProvider() {
  
  		@Override
  		public boolean isInteractive() {
  			return false;
  		}
  
  		@Override
  		public boolean supports(CredentialItem... items) {
  			for (CredentialItem item : items) {
  				if (item instanceof CredentialItem.InformationalMessage) {
  					continue;
  				}
  				if (item instanceof CredentialItem.YesNoType) {
  					continue;
  				}
  				return false;
  			}
  			return true;
  		}
  
  		@Override
  		public boolean get(URIish uri, CredentialItem... items)
  				throws UnsupportedCredentialItem {
  			for (CredentialItem item : items) {
  				if (item instanceof CredentialItem.InformationalMessage) {
  					continue;
  				}
  				if (item instanceof CredentialItem.YesNoType) {
  					((CredentialItem.YesNoType) item).setValue(true);
  					continue;
 				}
 				return false;
 			}
 			return true;
 		}
 	};
 
 	private URIish remoteURI;
 
 	private URIish secureURI;
 
 	private RevBlob A_txt;
 
 	private RevCommit A, B;
 
 	public SmartClientSmartServerSslTest(HttpConnectionFactory cf) {
 		super(cf);
 	}
 
 	@Override
 	protected AppServer createServer() {
 		return new AppServer(0, 0);
 	}
 
 	@Override
 	@Before
 	public void setUp() throws Exception {
 		super.setUp();
 
 		final TestRepository<Repository> src = createTestRepository();
 		final String srcName = src.getRepository().getDirectory().getName();
 		src.getRepository()
 				.getConfig()
 				.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null,
 						ConfigConstants.CONFIG_KEY_LOGALLREFUPDATES, true);
 
 		GitServlet gs = new GitServlet();
 
 		ServletContextHandler app = addNormalContext(gs, src, srcName);
 
 		server.setUp();
 
 		remoteURI = toURIish(app, srcName);
 		secureURI = new URIish(rewriteUrl(remoteURI.toString(), "https",
 				server.getSecurePort()));
 
 		A_txt = src.blob("A");
 		A = src.commit().add("A_txt", A_txt).create();
 		B = src.commit().parent(A).add("A_txt", "C").add("B", "B").create();
 		src.update(master, B);
 
 		src.update("refs/garbage/a/very/long/ref/name/to/compress", B);
 	}
 
 	private ServletContextHandler addNormalContext(GitServlet gs, TestRepository<Repository> src, String srcName) {
 		ServletContextHandler app = server.addContext("/git");
 		app.addFilter(new FilterHolder(new Filter() {
 
 			@Override
 			public void init(FilterConfig filterConfig)
 					throws ServletException {
 				// empty
 			}
 
 			// Redirects http to https for requests containing "/https/".
 			@Override
 			public void doFilter(ServletRequest request,
 					ServletResponse response, FilterChain chain)
 					throws IOException, ServletException {
 				final HttpServletResponse httpServletResponse = (HttpServletResponse) response;
 				final HttpServletRequest httpServletRequest = (HttpServletRequest) request;
 				final StringBuffer fullUrl = httpServletRequest.getRequestURL();
 				if (httpServletRequest.getQueryString() != null) {
 					fullUrl.append("?")
 							.append(httpServletRequest.getQueryString());
 				}
 				String urlString = rewriteUrl(fullUrl.toString(), "https",
 						server.getSecurePort());
 				httpServletResponse
 						.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
 				httpServletResponse.setHeader(HttpSupport.HDR_LOCATION,
 						urlString.replace("/https/", "/"));
 			}
 
 			@Override
 			public void destroy() {
 				// empty
 			}
 		}), "/https/*", EnumSet.of(DispatcherType.REQUEST));
 		app.addFilter(new FilterHolder(new Filter() {
 
 			@Override
 			public void init(FilterConfig filterConfig)
 					throws ServletException {
 				// empty
 			}
 
 			// Redirects https back to http for requests containing "/back/".
 			@Override
 			public void doFilter(ServletRequest request,
 					ServletResponse response, FilterChain chain)
 					throws IOException, ServletException {
 				final HttpServletResponse httpServletResponse = (HttpServletResponse) response;
 				final HttpServletRequest httpServletRequest = (HttpServletRequest) request;
 				final StringBuffer fullUrl = httpServletRequest.getRequestURL();
 				if (httpServletRequest.getQueryString() != null) {
 					fullUrl.append("?")
 							.append(httpServletRequest.getQueryString());
 				}
 				String urlString = rewriteUrl(fullUrl.toString(), "http",
 						server.getPort());
 				httpServletResponse
 						.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
 				httpServletResponse.setHeader(HttpSupport.HDR_LOCATION,
 						urlString.replace("/back/", "/"));
 			}
 
 			@Override
 			public void destroy() {
 				// empty
 			}
 		}), "/back/*", EnumSet.of(DispatcherType.REQUEST));
 		gs.setRepositoryResolver(new TestRepositoryResolver(src, srcName));
 		app.addServlet(new ServletHolder(gs), "/*");
 		return app;
 	}
 
 	@Test
 	public void testInitialClone_ViaHttps() throws Exception {
 		Repository dst = createBareRepository();
 		assertFalse(dst.getObjectDatabase().has(A_txt));
 
 		try (Transport t = Transport.open(dst, secureURI)) {
 			t.setCredentialsProvider(testCredentials);
 			t.fetch(NullProgressMonitor.INSTANCE, mirror(master));
 		}
 		assertTrue(dst.getObjectDatabase().has(A_txt));
 		assertEquals(B, dst.exactRef(master).getObjectId());
 		fsck(dst, B);
 
 		List<AccessEvent> requests = getRequests();
 		assertEquals(2, requests.size());
 	}
 
 	@Test
 	public void testInitialClone_RedirectToHttps() throws Exception {
 		Repository dst = createBareRepository();
 		assertFalse(dst.getObjectDatabase().has(A_txt));
 
 		URIish cloneFrom = extendPath(remoteURI, "/https");
 		try (Transport t = Transport.open(dst, cloneFrom)) {
 			t.setCredentialsProvider(testCredentials);
 			t.fetch(NullProgressMonitor.INSTANCE, mirror(master));
 		}
 		assertTrue(dst.getObjectDatabase().has(A_txt));
 		assertEquals(B, dst.exactRef(master).getObjectId());
 		fsck(dst, B);
 
 		List<AccessEvent> requests = getRequests();
 		assertEquals(3, requests.size());
 	}
 
 	@Test
 	public void testInitialClone_RedirectBackToHttp() throws Exception {
 		Repository dst = createBareRepository();
 		assertFalse(dst.getObjectDatabase().has(A_txt));
 
 		URIish cloneFrom = extendPath(secureURI, "/back");
 		try (Transport t = Transport.open(dst, cloneFrom)) {
 			t.setCredentialsProvider(testCredentials);
 			t.fetch(NullProgressMonitor.INSTANCE, mirror(master));
 			fail("Should have failed (redirect from https to http)");
 		} catch (TransportException e) {
 			assertTrue(e.getMessage().contains("not allowed"));
 		}
 	}
 
 	@Test
 	public void testInitialClone_SslFailure() throws Exception {
 		Repository dst = createBareRepository();
 		assertFalse(dst.getObjectDatabase().has(A_txt));
 
 		try (Transport t = Transport.open(dst, secureURI)) {
 			// Set a credentials provider that doesn't handle questions
 			t.setCredentialsProvider(
 					new UsernamePasswordCredentialsProvider("any", "anypwd"));
 			t.fetch(NullProgressMonitor.INSTANCE, mirror(master));
 			fail("Should have failed (SSL certificate not trusted)");
 		} catch (TransportException e) {
 			assertTrue(e.getMessage().contains("Secure connection"));
 		}
 	}
 
 }