/*
 * Copyright (C) 2013 Square, Inc.
 *
 * 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.squareup.okhttp.internal.framed;

import com.squareup.okhttp.Cache;
import com.squareup.okhttp.ConnectionPool;
import com.squareup.okhttp.HttpUrl;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.OkUrlFactory;
import com.squareup.okhttp.Protocol;
import com.squareup.okhttp.internal.RecordingAuthenticator;
import com.squareup.okhttp.internal.SslContextBuilder;
import com.squareup.okhttp.internal.Util;
import com.squareup.okhttp.mockwebserver.MockResponse;
import com.squareup.okhttp.mockwebserver.MockWebServer;
import com.squareup.okhttp.mockwebserver.RecordedRequest;
import com.squareup.okhttp.mockwebserver.SocketPolicy;
import com.squareup.okhttp.testing.RecordingHostnameVerifier;
import java.io.IOException;
import java.io.InputStream;
import java.net.Authenticator;
import java.net.CookieManager;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import okio.Buffer;
import okio.BufferedSink;
import okio.GzipSink;
import okio.Okio;
import org.junit.After;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.fail;

/** Test how SPDY interacts with HTTP features. */
public abstract class HttpOverSpdyTest {
  @Rule public final TemporaryFolder tempDir = new TemporaryFolder();
  @Rule public final MockWebServer server = new MockWebServer();

  /** Protocol to test, for example {@link com.squareup.okhttp.Protocol#SPDY_3} */
  private final Protocol protocol;
  protected String hostHeader = ":host";

  protected SSLContext sslContext = SslContextBuilder.localhost();
  protected HostnameVerifier hostnameVerifier = new RecordingHostnameVerifier();
  protected final OkUrlFactory client = new OkUrlFactory(new OkHttpClient());
  protected HttpURLConnection connection;
  protected Cache cache;

  protected HttpOverSpdyTest(Protocol protocol){
    this.protocol = protocol;
  }

  @Before public void setUp() throws Exception {
    server.useHttps(sslContext.getSocketFactory(), false);
    client.client().setProtocols(Arrays.asList(protocol, Protocol.HTTP_1_1));
    client.client().setSslSocketFactory(sslContext.getSocketFactory());
    client.client().setHostnameVerifier(hostnameVerifier);
    cache = new Cache(tempDir.getRoot(), Integer.MAX_VALUE);
  }

  @After public void tearDown() throws Exception {
    Authenticator.setDefault(null);
  }

  @Test public void get() throws Exception {
    MockResponse response = new MockResponse().setBody("ABCDE").setStatus("HTTP/1.1 200 Sweet");
    server.enqueue(response);

    connection = client.open(server.getUrl("/foo"));
    assertContent("ABCDE", connection, Integer.MAX_VALUE);
    assertEquals(200, connection.getResponseCode());
    assertEquals("Sweet", connection.getResponseMessage());

    RecordedRequest request = server.takeRequest();
    assertEquals("GET /foo HTTP/1.1", request.getRequestLine());
    assertEquals("https", request.getHeader(":scheme"));
    assertEquals(server.getHostName() + ":" + server.getPort(), request.getHeader(hostHeader));
  }

  @Test public void emptyResponse() throws IOException {
    server.enqueue(new MockResponse());

    connection = client.open(server.getUrl("/foo"));
    assertEquals(-1, connection.getInputStream().read());
  }

  byte[] postBytes = "FGHIJ".getBytes(Util.UTF_8);

  @Test public void noDefaultContentLengthOnStreamingPost() throws Exception {
    server.enqueue(new MockResponse().setBody("ABCDE"));

    connection = client.open(server.getUrl("/foo"));
    connection.setDoOutput(true);
    connection.setChunkedStreamingMode(0);
    connection.getOutputStream().write(postBytes);
    assertContent("ABCDE", connection, Integer.MAX_VALUE);

    RecordedRequest request = server.takeRequest();
    assertEquals("POST /foo HTTP/1.1", request.getRequestLine());
    assertArrayEquals(postBytes, request.getBody().readByteArray());
    assertNull(request.getHeader("Content-Length"));
  }

  @Test public void userSuppliedContentLengthHeader() throws Exception {
    server.enqueue(new MockResponse().setBody("ABCDE"));

    connection = client.open(server.getUrl("/foo"));
    connection.setRequestProperty("Content-Length", String.valueOf(postBytes.length));
    connection.setDoOutput(true);
    connection.getOutputStream().write(postBytes);
    assertContent("ABCDE", connection, Integer.MAX_VALUE);

    RecordedRequest request = server.takeRequest();
    assertEquals("POST /foo HTTP/1.1", request.getRequestLine());
    assertArrayEquals(postBytes, request.getBody().readByteArray());
    assertEquals(postBytes.length, Integer.parseInt(request.getHeader("Content-Length")));
  }

  @Test public void closeAfterFlush() throws Exception {
    server.enqueue(new MockResponse().setBody("ABCDE"));

    connection = client.open(server.getUrl("/foo"));
    connection.setRequestProperty("Content-Length", String.valueOf(postBytes.length));
    connection.setDoOutput(true);
    connection.getOutputStream().write(postBytes); // push bytes into SpdyDataOutputStream.buffer
    connection.getOutputStream().flush(); // FramedConnection.writeData subject to write window
    connection.getOutputStream().close(); // FramedConnection.writeData empty frame
    assertContent("ABCDE", connection, Integer.MAX_VALUE);

    RecordedRequest request = server.takeRequest();
    assertEquals("POST /foo HTTP/1.1", request.getRequestLine());
    assertArrayEquals(postBytes, request.getBody().readByteArray());
    assertEquals(postBytes.length, Integer.parseInt(request.getHeader("Content-Length")));
  }

  @Test public void setFixedLengthStreamingModeSetsContentLength() throws Exception {
    server.enqueue(new MockResponse().setBody("ABCDE"));

    connection = client.open(server.getUrl("/foo"));
    connection.setFixedLengthStreamingMode(postBytes.length);
    connection.setDoOutput(true);
    connection.getOutputStream().write(postBytes);
    assertContent("ABCDE", connection, Integer.MAX_VALUE);

    RecordedRequest request = server.takeRequest();
    assertEquals("POST /foo HTTP/1.1", request.getRequestLine());
    assertArrayEquals(postBytes, request.getBody().readByteArray());
    assertEquals(postBytes.length, Integer.parseInt(request.getHeader("Content-Length")));
  }

  @Test public void spdyConnectionReuse() throws Exception {
    server.enqueue(new MockResponse().setBody("ABCDEF"));
    server.enqueue(new MockResponse().setBody("GHIJKL"));

    HttpURLConnection connection1 = client.open(server.getUrl("/r1"));
    HttpURLConnection connection2 = client.open(server.getUrl("/r2"));
    assertEquals("ABC", readAscii(connection1.getInputStream(), 3));
    assertEquals("GHI", readAscii(connection2.getInputStream(), 3));
    assertEquals("DEF", readAscii(connection1.getInputStream(), 3));
    assertEquals("JKL", readAscii(connection2.getInputStream(), 3));
    assertEquals(0, server.takeRequest().getSequenceNumber());
    assertEquals(1, server.takeRequest().getSequenceNumber());
  }

  @Test @Ignore public void synchronousSpdyRequest() throws Exception {
    server.enqueue(new MockResponse().setBody("A"));
    server.enqueue(new MockResponse().setBody("A"));

    ExecutorService executor = Executors.newCachedThreadPool();
    CountDownLatch countDownLatch = new CountDownLatch(2);
    executor.execute(new SpdyRequest("/r1", countDownLatch));
    executor.execute(new SpdyRequest("/r2", countDownLatch));
    countDownLatch.await();
    assertEquals(0, server.takeRequest().getSequenceNumber());
    assertEquals(1, server.takeRequest().getSequenceNumber());
  }

  @Test public void gzippedResponseBody() throws Exception {
    server.enqueue(
        new MockResponse().addHeader("Content-Encoding: gzip").setBody(gzip("ABCABCABC")));
    assertContent("ABCABCABC", client.open(server.getUrl("/r1")), Integer.MAX_VALUE);
  }

  @Test public void authenticate() throws Exception {
    server.enqueue(new MockResponse().setResponseCode(HttpURLConnection.HTTP_UNAUTHORIZED)
        .addHeader("www-authenticate: Basic realm=\"protected area\"")
        .setBody("Please authenticate."));
    server.enqueue(new MockResponse().setBody("Successful auth!"));

    Authenticator.setDefault(new RecordingAuthenticator());
    connection = client.open(server.getUrl("/"));
    assertEquals("Successful auth!", readAscii(connection.getInputStream(), Integer.MAX_VALUE));

    RecordedRequest denied = server.takeRequest();
    assertNull(denied.getHeader("Authorization"));
    RecordedRequest accepted = server.takeRequest();
    assertEquals("GET / HTTP/1.1", accepted.getRequestLine());
    assertEquals("Basic " + RecordingAuthenticator.BASE_64_CREDENTIALS,
        accepted.getHeader("Authorization"));
  }

  @Test public void redirect() throws Exception {
    server.enqueue(new MockResponse().setResponseCode(HttpURLConnection.HTTP_MOVED_TEMP)
        .addHeader("Location: /foo")
        .setBody("This page has moved!"));
    server.enqueue(new MockResponse().setBody("This is the new location!"));

    connection = client.open(server.getUrl("/"));
    assertContent("This is the new location!", connection, Integer.MAX_VALUE);

    RecordedRequest request1 = server.takeRequest();
    assertEquals("/", request1.getPath());
    RecordedRequest request2 = server.takeRequest();
    assertEquals("/foo", request2.getPath());
  }

  @Test public void readAfterLastByte() throws Exception {
    server.enqueue(new MockResponse().setBody("ABC"));

    connection = client.open(server.getUrl("/"));
    InputStream in = connection.getInputStream();
    assertEquals("ABC", readAscii(in, 3));
    assertEquals(-1, in.read());
    assertEquals(-1, in.read());
  }

  @Ignore // See https://github.com/square/okhttp/issues/578
  @Test(timeout = 3000) public void readResponseHeaderTimeout() throws Exception {
    server.enqueue(new MockResponse().setSocketPolicy(SocketPolicy.NO_RESPONSE));
    server.enqueue(new MockResponse().setBody("A"));

    connection = client.open(server.getUrl("/"));
    connection.setReadTimeout(1000);
    assertContent("A", connection, Integer.MAX_VALUE);
  }

  /**
   * Test to ensure we don't  throw a read timeout on responses that are
   * progressing.  For this case, we take a 4KiB body and throttle it to
   * 1KiB/second.  We set the read timeout to two seconds.  If our
   * implementation is acting correctly, it will not throw, as it is
   * progressing.
   */
  @Test public void readTimeoutMoreGranularThanBodySize() throws Exception {
    char[] body = new char[4096]; // 4KiB to read
    Arrays.fill(body, 'y');
    server.enqueue(new MockResponse().setBody(new String(body)).throttleBody(1024, 1, SECONDS)); // slow connection 1KiB/second

    connection = client.open(server.getUrl("/"));
    connection.setReadTimeout(2000); // 2 seconds to read something.
    assertContent(new String(body), connection, Integer.MAX_VALUE);
  }

  /**
   * Test to ensure we throw a read timeout on responses that are progressing
   * too slowly.  For this case, we take a 2KiB body and throttle it to
   * 1KiB/second.  We set the read timeout to half a second.  If our
   * implementation is acting correctly, it will throw, as a byte doesn't
   * arrive in time.
   */
  @Test public void readTimeoutOnSlowConnection() throws Exception {
    char[] body = new char[2048]; // 2KiB to read
    Arrays.fill(body, 'y');
    server.enqueue(new MockResponse()
        .setBody(new String(body))
        .throttleBody(1024, 1, SECONDS)); // slow connection 1KiB/second

    connection = client.open(server.getUrl("/"));
    connection.setReadTimeout(500); // half a second to read something
    connection.connect();
    try {
      readAscii(connection.getInputStream(), Integer.MAX_VALUE);
      fail("Should have timed out!");
    } catch (SocketTimeoutException expected) {
      assertEquals("timeout", expected.getMessage());
    }
  }

  @Test public void spdyConnectionTimeout() throws Exception {
    MockResponse response = new MockResponse().setBody("A");
    response.setBodyDelay(1, TimeUnit.SECONDS);
    server.enqueue(response);

    HttpURLConnection connection1 = client.open(server.getUrl("/"));
    connection1.setReadTimeout(2000);
    HttpURLConnection connection2 = client.open(server.getUrl("/"));
    connection2.setReadTimeout(200);
    connection1.connect();
    connection2.connect();
    assertContent("A", connection1, Integer.MAX_VALUE);
  }

  @Test public void responsesAreCached() throws IOException {
    client.client().setCache(cache);

    server.enqueue(new MockResponse().addHeader("cache-control: max-age=60").setBody("A"));

    assertContent("A", client.open(server.getUrl("/")), Integer.MAX_VALUE);
    assertEquals(1, cache.getRequestCount());
    assertEquals(1, cache.getNetworkCount());
    assertEquals(0, cache.getHitCount());
    assertContent("A", client.open(server.getUrl("/")), Integer.MAX_VALUE);
    assertContent("A", client.open(server.getUrl("/")), Integer.MAX_VALUE);
    assertEquals(3, cache.getRequestCount());
    assertEquals(1, cache.getNetworkCount());
    assertEquals(2, cache.getHitCount());
  }

  @Test public void conditionalCache() throws IOException {
    client.client().setCache(cache);

    server.enqueue(new MockResponse().addHeader("ETag: v1").setBody("A"));
    server.enqueue(new MockResponse().setResponseCode(HttpURLConnection.HTTP_NOT_MODIFIED));

    assertContent("A", client.open(server.getUrl("/")), Integer.MAX_VALUE);
    assertEquals(1, cache.getRequestCount());
    assertEquals(1, cache.getNetworkCount());
    assertEquals(0, cache.getHitCount());
    assertContent("A", client.open(server.getUrl("/")), Integer.MAX_VALUE);
    assertEquals(2, cache.getRequestCount());
    assertEquals(2, cache.getNetworkCount());
    assertEquals(1, cache.getHitCount());
  }

  @Test public void responseCachedWithoutConsumingFullBody() throws IOException {
    client.client().setCache(cache);

    server.enqueue(new MockResponse().addHeader("cache-control: max-age=60").setBody("ABCD"));
    server.enqueue(new MockResponse().addHeader("cache-control: max-age=60").setBody("EFGH"));

    HttpURLConnection connection1 = client.open(server.getUrl("/"));
    InputStream in1 = connection1.getInputStream();
    assertEquals("AB", readAscii(in1, 2));
    in1.close();

    HttpURLConnection connection2 = client.open(server.getUrl("/"));
    InputStream in2 = connection2.getInputStream();
    assertEquals("ABCD", readAscii(in2, Integer.MAX_VALUE));
    in2.close();
  }

  @Test public void acceptAndTransmitCookies() throws Exception {
    CookieManager cookieManager = new CookieManager();
    client.client().setCookieHandler(cookieManager);

    server.enqueue(new MockResponse()
        .addHeader("set-cookie: c=oreo; domain=" + server.getCookieDomain())
        .setBody("A"));
    server.enqueue(new MockResponse()
        .setBody("B"));

    HttpUrl url = server.url("/");
    assertContent("A", client.open(url.url()), Integer.MAX_VALUE);
    Map<String, List<String>> requestHeaders = Collections.emptyMap();
    assertEquals(Collections.singletonMap("Cookie", Arrays.asList("c=oreo")),
        cookieManager.get(url.uri(), requestHeaders));

    assertContent("B", client.open(url.url()), Integer.MAX_VALUE);
    RecordedRequest requestA = server.takeRequest();
    assertNull(requestA.getHeader("Cookie"));
    RecordedRequest requestB = server.takeRequest();
    assertEquals("c=oreo", requestB.getHeader("Cookie"));
  }

  /** https://github.com/square/okhttp/issues/1191 */
  @Test public void disconnectWithStreamNotEstablished() throws Exception {
    ConnectionPool connectionPool = new ConnectionPool(5, 5000);
    client.client().setConnectionPool(connectionPool);

    server.enqueue(new MockResponse().setBody("abc"));

    // Disconnect before the stream is created. A connection is still established!
    HttpURLConnection connection1 = client.open(server.getUrl("/"));
    connection1.connect();
    connection1.disconnect();

    // That connection is pooled, and it works.
    assertEquals(1, connectionPool.getSpdyConnectionCount());
    HttpURLConnection connection2 = client.open(server.getUrl("/"));
    assertContent("abc", connection2, 3);
    assertEquals(0, server.takeRequest().getSequenceNumber());
  }

  void assertContent(String expected, HttpURLConnection connection, int limit)
      throws IOException {
    connection.connect();
    assertEquals(expected, readAscii(connection.getInputStream(), limit));
  }

  private String readAscii(InputStream in, int count) throws IOException {
    StringBuilder result = new StringBuilder();
    for (int i = 0; i < count; i++) {
      int value = in.read();
      if (value == -1) {
        in.close();
        break;
      }
      result.append((char) value);
    }
    return result.toString();
  }

  public Buffer gzip(String bytes) throws IOException {
    Buffer bytesOut = new Buffer();
    BufferedSink sink = Okio.buffer(new GzipSink(bytesOut));
    sink.writeUtf8(bytes);
    sink.close();
    return bytesOut;
  }

  class SpdyRequest implements Runnable {
    String path;
    CountDownLatch countDownLatch;
    public SpdyRequest(String path, CountDownLatch countDownLatch) {
      this.path = path;
      this.countDownLatch = countDownLatch;
    }

    @Override public void run() {
      try {
        HttpURLConnection conn = client.open(server.getUrl(path));
        assertEquals("A", readAscii(conn.getInputStream(), 1));
        countDownLatch.countDown();
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  }
}