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 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

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

 *

 * This code is free software; you can redistribute it and/or modify it

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

 * published by the Free Software Foundation.

 *

 * 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 Tests response body subscribers's onNext's Lists are unmodifiable,

 *          and that the buffers are read-only

 * @library /lib/testlibrary http2/server

 * @build jdk.testlibrary.SimpleSSLContext

 * @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

 * @run testng/othervm ImmutableFlowItems

 */

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.nio.ByteBuffer;

import java.util.List;

import java.util.concurrent.CompletionStage;

import java.util.concurrent.Flow;

import com.sun.net.httpserver.HttpExchange;

import com.sun.net.httpserver.HttpHandler;

import com.sun.net.httpserver.HttpServer;

import com.sun.net.httpserver.HttpsConfigurator;

import com.sun.net.httpserver.HttpsServer;

import java.net.http.HttpClient;

import java.net.http.HttpHeaders;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpResponse.BodyHandler;

import java.net.http.HttpResponse.BodySubscriber;

import java.net.http.HttpResponse.BodySubscribers;

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.*;

public class ImmutableFlowItems {

    SSLContext sslContext;

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

    HttpsServer httpsTestServer;       // HTTPS/1.1

    Http2TestServer http2TestServer;   // HTTP/2 ( h2c )

    Http2TestServer https2TestServer;  // HTTP/2 ( h2  )

    String httpURI_fixed;

    String httpURI_chunk;

    String httpsURI_fixed;

    String httpsURI_chunk;

    String http2URI_fixed;

    String http2URI_chunk;

    String https2URI_fixed;

    String https2URI_chunk;

    @DataProvider(name = "variants")

    public Object[][] variants() {

        return new Object[][]{

                { httpURI_fixed   },

                { httpURI_chunk   },

                { httpsURI_fixed  },

                { httpsURI_chunk  },

                { http2URI_fixed  },

                { http2URI_chunk  },

                { https2URI_fixed },

                { https2URI_chunk },

        };

    }

    static final String BODY = "You'll never plough a field by turning it over in your mind.";

    HttpClient newHttpClient() {

        return HttpClient.newBuilder()

                .sslContext(sslContext)

                .build();

    }

    @Test(dataProvider = "variants")

    public void testAsString(String uri) throws Exception {

        HttpClient client = newHttpClient();

        HttpRequest req = HttpRequest.newBuilder(URI.create(uri))

                .build();

        BodyHandler<String> handler = new CRSBodyHandler();

        client.sendAsync(req, handler)

                .thenApply(HttpResponse::body)

                .thenAccept(body -> assertEquals(body, BODY))

                .join();

    }

    static class CRSBodyHandler implements BodyHandler<String> {

        @Override

            return new CRSBodySubscriber();

        }

    }

    static class CRSBodySubscriber implements BodySubscriber<String> {

        private final BodySubscriber<String> ofString = BodySubscribers.ofString(UTF_8);

        @Override

        public void onSubscribe(Flow.Subscription subscription) {

            ofString.onSubscribe(subscription);

        }

        @Override

        public void onNext(List<ByteBuffer> item) {

            assertUnmodifiableList(item);

            long c = item.stream().filter(ByteBuffer::isReadOnly).count();

            assertEquals(c, item.size(), "Unexpected writable buffer in: " +item);

            ofString.onNext(item);

        }

        @Override

        public void onError(Throwable throwable) {

            ofString.onError(throwable);

        }

        @Override

        public void onComplete() {

            ofString.onComplete();

        }

        @Override

        public CompletionStage<String> getBody() {

            return ofString.getBody();

        }

    }

    static final Class<UnsupportedOperationException> UOE = UnsupportedOperationException.class;

    static void assertUnmodifiableList(List<ByteBuffer> list) {

        assertNotNull(list);

        ByteBuffer b = list.get(0);

        assertNotNull(b);

        assertThrows(UOE, () -> list.add(ByteBuffer.wrap(new byte[0])));

        assertThrows(UOE, () -> list.remove(b));

    }

    static String serverAuthority(HttpServer server) {

        return InetAddress.getLoopbackAddress().getHostName() + ":"

                + server.getAddress().getPort();

    }

    @BeforeTest

    public void setup() throws Exception {

        sslContext = new SimpleSSLContext().get();

        if (sslContext == null)

            throw new AssertionError("Unexpected null sslContext");

        // HTTP/1.1

        HttpHandler h1_fixedLengthHandler = new HTTP1_FixedLengthHandler();

        HttpHandler h1_chunkHandler = new HTTP1_ChunkedHandler();

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

        httpTestServer = HttpServer.create(sa, 0);

        httpTestServer.createContext("/http1/fixed", h1_fixedLengthHandler);

        httpTestServer.createContext("/http1/chunk", h1_chunkHandler);

        httpURI_fixed = "http://" + serverAuthority(httpTestServer) + "/http1/fixed";

        httpURI_chunk = "http://" + serverAuthority(httpTestServer) + "/http1/chunk";

        httpsTestServer = HttpsServer.create(sa, 0);

        httpsTestServer.setHttpsConfigurator(new HttpsConfigurator(sslContext));

        httpsTestServer.createContext("/https1/fixed", h1_fixedLengthHandler);

        httpsTestServer.createContext("/https1/chunk", h1_chunkHandler);

        httpsURI_fixed = "https://" + serverAuthority(httpsTestServer) + "/https1/fixed";

        httpsURI_chunk = "https://" + serverAuthority(httpsTestServer) + "/https1/chunk";

        // HTTP/2

        Http2Handler h2_fixedLengthHandler = new HTTP2_FixedLengthHandler();

        Http2Handler h2_chunkedHandler = new HTTP2_VariableHandler();

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

        http2TestServer.addHandler(h2_fixedLengthHandler, "/http2/fixed");

        http2TestServer.addHandler(h2_chunkedHandler, "/http2/chunk");

        http2URI_fixed = "http://" + http2TestServer.serverAuthority() + "/http2/fixed";

        http2URI_chunk = "http://" + http2TestServer.serverAuthority() + "/http2/chunk";

        https2TestServer = new Http2TestServer("localhost", true, 0);

        https2TestServer.addHandler(h2_fixedLengthHandler, "/https2/fixed");

        https2TestServer.addHandler(h2_chunkedHandler, "/https2/chunk");

        https2URI_fixed = "https://" + https2TestServer.serverAuthority() + "/https2/fixed";

        https2URI_chunk = "https://" + https2TestServer.serverAuthority() + "/https2/chunk";

        httpTestServer.start();

        httpsTestServer.start();

        http2TestServer.start();

        https2TestServer.start();

    }

    @AfterTest

    public void teardown() throws Exception {

        httpTestServer.stop(0);

        httpsTestServer.stop(0);

        http2TestServer.stop();

        https2TestServer.stop();

    }

    static class HTTP1_FixedLengthHandler implements HttpHandler {

        @Override

        public void handle(HttpExchange t) throws IOException {

            out.println("HTTP1_FixedLengthHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody();

                 OutputStream os = t.getResponseBody()) {

                is.readAllBytes();

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

                t.sendResponseHeaders(200, bytes.length);

                os.write(bytes);

            }

        }

    }

    static class HTTP1_ChunkedHandler implements HttpHandler {

        @Override

        public void handle(HttpExchange t) throws IOException {

            out.println("HTTP1_ChunkedHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody();

                 OutputStream os = t.getResponseBody()) {

                is.readAllBytes();

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

                t.sendResponseHeaders(200, 0);

                os.write(bytes);

            }

        }

    }

    static class HTTP2_FixedLengthHandler implements Http2Handler {

        @Override

        public void handle(Http2TestExchange t) throws IOException {

            out.println("HTTP2_FixedLengthHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody();

                 OutputStream os = t.getResponseBody()) {

                is.readAllBytes();

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

                t.sendResponseHeaders(200, bytes.length);

                os.write(bytes);

            }

        }

    }

    static class HTTP2_VariableHandler implements Http2Handler {

        @Override

        public void handle(Http2TestExchange t) throws IOException {

            out.println("HTTP2_VariableHandler received request to " + t.getRequestURI());

            try (InputStream is = t.getRequestBody();

                 OutputStream os = t.getResponseBody()) {

                is.readAllBytes();

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

                t.sendResponseHeaders(200, 0); // variable

                os.write(bytes);

            }

        }

    }

}