/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * under the terms of the GNU General Public License version 2 only, as

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 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/*

 * @test

 * @summary Basic test for redirect and redirect policies

 * @modules java.base/sun.net.www.http

 *          java.net.http/jdk.internal.net.http.common

 *          java.net.http/jdk.internal.net.http.frame

 *          java.net.http/jdk.internal.net.http.hpack

 *          java.logging

 *          jdk.httpserver

 * @library /lib/testlibrary /test/lib http2/server

 * @build Http2TestServer

 * @build jdk.testlibrary.SimpleSSLContext

 * @run testng/othervm

 *       -Djdk.httpclient.HttpClient.log=trace,headers,requests

 *       BasicRedirectTest

 */

import com.sun.net.httpserver.HttpServer;

import com.sun.net.httpserver.HttpsConfigurator;

import com.sun.net.httpserver.HttpsServer;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpClient.Redirect;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpResponse.BodyHandlers;

import javax.net.ssl.SSLContext;

import jdk.testlibrary.SimpleSSLContext;

import org.testng.annotations.AfterTest;

import org.testng.annotations.BeforeTest;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

import static java.lang.System.out;

import static java.nio.charset.StandardCharsets.UTF_8;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertFalse;

import static org.testng.Assert.assertTrue;

public class BasicRedirectTest implements HttpServerAdapters {

    SSLContext sslContext;

    HttpTestServer httpTestServer;        // HTTP/1.1    [ 4 servers ]

    HttpTestServer httpsTestServer;       // HTTPS/1.1

    HttpTestServer http2TestServer;       // HTTP/2 ( h2c )

    HttpTestServer https2TestServer;      // HTTP/2 ( h2  )

    String httpURI;

    String httpURIToMoreSecure; // redirects HTTP to HTTPS

    String httpsURI;

    String httpsURIToLessSecure; // redirects HTTPS to HTTP

    String http2URI;

    String http2URIToMoreSecure; // redirects HTTP to HTTPS

    String https2URI;

    String https2URIToLessSecure; // redirects HTTPS to HTTP

    static final String MESSAGE = "Is fearr Gaeilge briste, na Bearla cliste";

    static final int ITERATIONS = 3;

    @DataProvider(name = "positive")

    public Object[][] positive() {

        return new Object[][] {

                { httpURI,               Redirect.ALWAYS        },

                { httpsURI,              Redirect.ALWAYS        },

                { http2URI,              Redirect.ALWAYS        },

                { https2URI,             Redirect.ALWAYS        },

                { httpURIToMoreSecure,   Redirect.ALWAYS        },

                { http2URIToMoreSecure,  Redirect.ALWAYS        },

                { httpsURIToLessSecure,  Redirect.ALWAYS        },

                { https2URIToLessSecure, Redirect.ALWAYS        },

                { httpURI,               Redirect.NORMAL        },

                { httpsURI,              Redirect.NORMAL        },

                { http2URI,              Redirect.NORMAL        },

                { https2URI,             Redirect.NORMAL        },

                { httpURIToMoreSecure,   Redirect.NORMAL        },

                { http2URIToMoreSecure,  Redirect.NORMAL        },

        };

    }

    @Test(dataProvider = "positive")

    void test(String uriString, Redirect redirectPolicy) throws Exception {

        out.printf("%n---- starting positive (%s, %s) ----%n", uriString, redirectPolicy);

        HttpClient client = HttpClient.newBuilder()

                .followRedirects(redirectPolicy)

                .sslContext(sslContext)

                .build();

        URI uri = URI.create(uriString);

        HttpRequest request = HttpRequest.newBuilder(uri).build();

        out.println("Initial request: " + request.uri());

        for (int i=0; i< ITERATIONS; i++) {

            out.println("iteration: " + i);

            HttpResponse<String> response = client.send(request, BodyHandlers.ofString());

            out.println("  Got response: " + response);

            out.println("  Got body Path: " + response.body());

            out.println("  Got response.request: " + response.request());

            assertEquals(response.statusCode(), 200);

            assertEquals(response.body(), MESSAGE);

            // asserts redirected URI in response.request().uri()

            assertTrue(response.uri().getPath().endsWith("message"));

            assertPreviousRedirectResponses(request, response);

        }

    }

    static void assertPreviousRedirectResponses(HttpRequest initialRequest,

                                                HttpResponse<?> finalResponse) {

        // there must be at least one previous response

        finalResponse.previousResponse()

                .orElseThrow(() -> new RuntimeException("no previous response"));

        HttpResponse<?> response = finalResponse;

        do {

            URI uri = response.uri();

            response = response.previousResponse().get();

            assertTrue(300 <= response.statusCode() && response.statusCode() <= 309,

                       "Expected 300 <= code <= 309, got:" + response.statusCode());

            assertEquals(response.body(), null, "Unexpected body: " + response.body());

            String locationHeader = response.headers().firstValue("Location")

                      .orElseThrow(() -> new RuntimeException("no previous Location"));

            assertTrue(uri.toString().endsWith(locationHeader),

                      "URI: " + uri + ", Location: " + locationHeader);

        } while (response.previousResponse().isPresent());

        // initial

        assertEquals(initialRequest, response.request(),

                String.format("Expected initial request [%s] to equal last prev req [%s]",

                              initialRequest, response.request()));

    }

    // --  negatives

    @DataProvider(name = "negative")

    public Object[][] negative() {

        return new Object[][] {

                { httpURI,               Redirect.NEVER         },

                { httpsURI,              Redirect.NEVER         },

                { http2URI,              Redirect.NEVER         },

                { https2URI,             Redirect.NEVER         },

                { httpURIToMoreSecure,   Redirect.NEVER         },

                { http2URIToMoreSecure,  Redirect.NEVER         },

                { httpsURIToLessSecure,  Redirect.NEVER         },

                { https2URIToLessSecure, Redirect.NEVER         },

                { httpsURIToLessSecure,  Redirect.NORMAL        },

                { https2URIToLessSecure, Redirect.NORMAL        },

        };

    }

    @Test(dataProvider = "negative")

    void testNegatives(String uriString,Redirect redirectPolicy) throws Exception {

        out.printf("%n---- starting negative (%s, %s) ----%n", uriString, redirectPolicy);

        HttpClient client = HttpClient.newBuilder()

                .followRedirects(redirectPolicy)

                .sslContext(sslContext)

                .build();

        URI uri = URI.create(uriString);

        HttpRequest request = HttpRequest.newBuilder(uri).build();

        out.println("Initial request: " + request.uri());

        for (int i=0; i< ITERATIONS; i++) {

            out.println("iteration: " + i);

            HttpResponse<String> response = client.send(request, BodyHandlers.ofString());

            out.println("  Got response: " + response);

            out.println("  Got body Path: " + response.body());

            out.println("  Got response.request: " + response.request());

            assertEquals(response.statusCode(), 302);

            assertEquals(response.body(), "XY");

            // asserts original URI in response.request().uri()

            assertTrue(response.uri().equals(uri));

            assertFalse(response.previousResponse().isPresent());

        }

    }

    // -- Infrastructure

    @BeforeTest

    public void setup() throws Exception {

        sslContext = new SimpleSSLContext().get();

        if (sslContext == null)

            throw new AssertionError("Unexpected null sslContext");

        InetSocketAddress sa = new InetSocketAddress(InetAddress.getLoopbackAddress(), 0);

        httpTestServer = HttpTestServer.of(HttpServer.create(sa, 0));

        httpTestServer.addHandler(new BasicHttpRedirectHandler(), "/http1/same/");

        httpURI = "http://" + httpTestServer.serverAuthority() + "/http1/same/redirect";

        HttpsServer httpsServer = HttpsServer.create(sa, 0);

        httpsServer.setHttpsConfigurator(new HttpsConfigurator(sslContext));

        httpsTestServer = HttpTestServer.of(httpsServer);

        httpsTestServer.addHandler(new BasicHttpRedirectHandler(),"/https1/same/");

        httpsURI = "https://" + httpsTestServer.serverAuthority() + "/https1/same/redirect";

        http2TestServer = HttpTestServer.of(new Http2TestServer("localhost", false, 0));

        http2TestServer.addHandler(new BasicHttpRedirectHandler(), "/http2/same/");

        http2URI = "http://" + http2TestServer.serverAuthority() + "/http2/same/redirect";

        https2TestServer.addHandler(new BasicHttpRedirectHandler(), "/https2/same/");

        https2URI = "https://" + https2TestServer.serverAuthority() + "/https2/same/redirect";

        // HTTP to HTTPS redirect handler

        httpTestServer.addHandler(new ToSecureHttpRedirectHandler(httpsURI), "/http1/toSecure/");

        httpURIToMoreSecure = "http://" + httpTestServer.serverAuthority()+ "/http1/toSecure/redirect";

        // HTTP2 to HTTP2S redirect handler

        http2TestServer.addHandler(new ToSecureHttpRedirectHandler(https2URI), "/http2/toSecure/");

        http2URIToMoreSecure = "http://" + http2TestServer.serverAuthority() + "/http2/toSecure/redirect";

        // HTTPS to HTTP redirect handler

        httpsTestServer.addHandler(new ToLessSecureRedirectHandler(httpURI), "/https1/toLessSecure/");

        httpsURIToLessSecure = "https://" + httpsTestServer.serverAuthority() + "/https1/toLessSecure/redirect";

        // HTTPS2 to HTTP2 redirect handler

        https2TestServer.addHandler(new ToLessSecureRedirectHandler(http2URI), "/https2/toLessSecure/");

        https2URIToLessSecure = "https://" + https2TestServer.serverAuthority() + "/https2/toLessSecure/redirect";

        httpTestServer.start();

        httpsTestServer.start();

        http2TestServer.start();

        https2TestServer.start();

    }

    @AfterTest

    public void teardown() throws Exception {

        httpTestServer.stop();

        httpsTestServer.stop();

        http2TestServer.stop();

        https2TestServer.stop();

    }

    // Redirects to same protocol

    static class BasicHttpRedirectHandler implements HttpTestHandler {

        // flip-flop between chunked/variable and fixed length redirect responses

        volatile int count;

        @Override

        public void handle(HttpTestExchange t) throws IOException {

            System.out.println("BasicHttpRedirectHandler for: " + t.getRequestURI());

            readAllRequestData(t);

            if (t.getRequestURI().getPath().endsWith("redirect")) {

                String url = t.getRequestURI().resolve("message").toString();

                t.getResponseHeaders().addHeader("Location", url);

                int len = count % 2 == 0 ? 2 : -1;

                t.sendResponseHeaders(302, len);

                try (OutputStream os = t.getResponseBody()) {

                    os.write(new byte[]{'X', 'Y'});  // stuffing some response body

                }

            } else {

                try (OutputStream os = t.getResponseBody()) {

                    byte[] bytes = MESSAGE.getBytes(UTF_8);

                    t.sendResponseHeaders(200, bytes.length);

                    os.write(bytes);

                }

            }

        }

    }

    // Redirects to a, possibly, more secure protocol, (HTTP to HTTPS)

    static class ToSecureHttpRedirectHandler implements HttpTestHandler {

        final String targetURL;

        ToSecureHttpRedirectHandler(String targetURL) {

            this.targetURL = targetURL;

        }

        @Override

        public void handle(HttpTestExchange t) throws IOException {

            System.out.println("ToSecureHttpRedirectHandler for: " + t.getRequestURI());

            readAllRequestData(t);

            if (t.getRequestURI().getPath().endsWith("redirect")) {

                t.getResponseHeaders().addHeader("Location", targetURL);

                System.out.println("ToSecureHttpRedirectHandler redirecting to: " + targetURL);

                t.sendResponseHeaders(302, 2); // fixed-length

                try (OutputStream os = t.getResponseBody()) {

                    os.write(new byte[]{'X', 'Y'});

                }

            } else {

                Throwable ex = new RuntimeException("Unexpected request");

                ex.printStackTrace();

                t.sendResponseHeaders(500, 0);

            }

        }

    }

    // Redirects to a, possibly, less secure protocol (HTTPS to HTTP)

    static class ToLessSecureRedirectHandler implements HttpTestHandler {

        final String targetURL;

        ToLessSecureRedirectHandler(String targetURL) {

            this.targetURL = targetURL;

        }

        @Override

        public void handle(HttpTestExchange t) throws IOException {

            System.out.println("ToLessSecureRedirectHandler for: " + t.getRequestURI());

            readAllRequestData(t);

            if (t.getRequestURI().getPath().endsWith("redirect")) {

                t.getResponseHeaders().addHeader("Location", targetURL);

                System.out.println("ToLessSecureRedirectHandler redirecting to: " + targetURL);

                t.sendResponseHeaders(302, -1);  // chunked/variable

                try (OutputStream os = t.getResponseBody()) {

                    os.write(new byte[]{'X', 'Y'});

                }

            } else {

                Throwable ex = new RuntimeException("Unexpected request");

                ex.printStackTrace();

                t.sendResponseHeaders(500, 0);

            }

        }

    }

    static void readAllRequestData(HttpTestExchange t) throws IOException {

        try (InputStream is = t.getRequestBody()) {

            is.readAllBytes();

        }

    }

}