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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.http;
import com.squareup.okhttp.Headers;
import com.squareup.okhttp.Protocol;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import com.squareup.okhttp.ResponseBody;
import com.squareup.okhttp.internal.Util;
import com.squareup.okhttp.internal.spdy.ErrorCode;
import com.squareup.okhttp.internal.spdy.Header;
import com.squareup.okhttp.internal.spdy.SpdyConnection;
import com.squareup.okhttp.internal.spdy.SpdyStream;
import java.io.IOException;
import java.net.ProtocolException;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import okio.ByteString;
import okio.Okio;
import okio.Sink;
import static com.squareup.okhttp.internal.spdy.Header.RESPONSE_STATUS;
import static com.squareup.okhttp.internal.spdy.Header.TARGET_AUTHORITY;
import static com.squareup.okhttp.internal.spdy.Header.TARGET_HOST;
import static com.squareup.okhttp.internal.spdy.Header.TARGET_METHOD;
import static com.squareup.okhttp.internal.spdy.Header.TARGET_PATH;
import static com.squareup.okhttp.internal.spdy.Header.TARGET_SCHEME;
import static com.squareup.okhttp.internal.spdy.Header.VERSION;
public final class SpdyTransport implements Transport {
/** See http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3-1#TOC-3.2.1-Request. */
private static final List SPDY_3_PROHIBITED_HEADERS = Util.immutableList(
ByteString.encodeUtf8("connection"),
ByteString.encodeUtf8("host"),
ByteString.encodeUtf8("keep-alive"),
ByteString.encodeUtf8("proxy-connection"),
ByteString.encodeUtf8("transfer-encoding"));
/** See http://tools.ietf.org/html/draft-ietf-httpbis-http2-09#section-8.1.3. */
private static final List HTTP_2_PROHIBITED_HEADERS = Util.immutableList(
ByteString.encodeUtf8("connection"),
ByteString.encodeUtf8("host"),
ByteString.encodeUtf8("keep-alive"),
ByteString.encodeUtf8("proxy-connection"),
ByteString.encodeUtf8("te"),
ByteString.encodeUtf8("transfer-encoding"),
ByteString.encodeUtf8("encoding"),
ByteString.encodeUtf8("upgrade"));
private final HttpEngine httpEngine;
private final SpdyConnection spdyConnection;
private SpdyStream stream;
public SpdyTransport(HttpEngine httpEngine, SpdyConnection spdyConnection) {
this.httpEngine = httpEngine;
this.spdyConnection = spdyConnection;
}
@Override public Sink createRequestBody(Request request, long contentLength) throws IOException {
return stream.getSink();
}
@Override public void writeRequestHeaders(Request request) throws IOException {
if (stream != null) return;
httpEngine.writingRequestHeaders();
boolean permitsRequestBody = httpEngine.permitsRequestBody();
boolean hasResponseBody = true;
String version = RequestLine.version(httpEngine.getConnection().getProtocol());
stream = spdyConnection.newStream(
writeNameValueBlock(request, spdyConnection.getProtocol(), version), permitsRequestBody,
hasResponseBody);
stream.readTimeout().timeout(httpEngine.client.getReadTimeout(), TimeUnit.MILLISECONDS);
}
@Override public void writeRequestBody(RetryableSink requestBody) throws IOException {
requestBody.writeToSocket(stream.getSink());
}
@Override public void finishRequest() throws IOException {
stream.getSink().close();
}
@Override public Response.Builder readResponseHeaders() throws IOException {
return readNameValueBlock(stream.getResponseHeaders(), spdyConnection.getProtocol());
}
/**
* Returns a list of alternating names and values containing a SPDY request.
* Names are all lowercase. No names are repeated. If any name has multiple
* values, they are concatenated using "\0" as a delimiter.
*/
public static List writeNameValueBlock(Request request, Protocol protocol,
String version) {
Headers headers = request.headers();
List result = new ArrayList<>(headers.size() + 10);
result.add(new Header(TARGET_METHOD, request.method()));
result.add(new Header(TARGET_PATH, RequestLine.requestPath(request.url())));
String host = HttpEngine.hostHeader(request.url());
if (Protocol.SPDY_3 == protocol) {
result.add(new Header(VERSION, version));
result.add(new Header(TARGET_HOST, host));
} else if (Protocol.HTTP_2 == protocol) {
result.add(new Header(TARGET_AUTHORITY, host)); // Optional in HTTP/2
} else {
throw new AssertionError();
}
result.add(new Header(TARGET_SCHEME, request.url().getProtocol()));
Set names = new LinkedHashSet();
for (int i = 0, size = headers.size(); i < size; i++) {
// header names must be lowercase.
ByteString name = ByteString.encodeUtf8(headers.name(i).toLowerCase(Locale.US));
String value = headers.value(i);
// Drop headers that are forbidden when layering HTTP over SPDY.
if (isProhibitedHeader(protocol, name)) continue;
// They shouldn't be set, but if they are, drop them. We've already written them!
if (name.equals(TARGET_METHOD)
|| name.equals(TARGET_PATH)
|| name.equals(TARGET_SCHEME)
|| name.equals(TARGET_AUTHORITY)
|| name.equals(TARGET_HOST)
|| name.equals(VERSION)) {
continue;
}
// If we haven't seen this name before, add the pair to the end of the list...
if (names.add(name)) {
result.add(new Header(name, value));
continue;
}
// ...otherwise concatenate the existing values and this value.
for (int j = 0; j < result.size(); j++) {
if (result.get(j).name.equals(name)) {
String concatenated = joinOnNull(result.get(j).value.utf8(), value);
result.set(j, new Header(name, concatenated));
break;
}
}
}
return result;
}
private static String joinOnNull(String first, String second) {
return new StringBuilder(first).append('\0').append(second).toString();
}
/** Returns headers for a name value block containing a SPDY response. */
public static Response.Builder readNameValueBlock(List headerBlock,
Protocol protocol) throws IOException {
String status = null;
String version = "HTTP/1.1"; // :version present only in spdy/3.
Headers.Builder headersBuilder = new Headers.Builder();
headersBuilder.set(OkHeaders.SELECTED_PROTOCOL, protocol.toString());
for (int i = 0, size = headerBlock.size(); i < size; i++) {
ByteString name = headerBlock.get(i).name;
String values = headerBlock.get(i).value.utf8();
for (int start = 0; start < values.length(); ) {
int end = values.indexOf('\0', start);
if (end == -1) {
end = values.length();
}
String value = values.substring(start, end);
if (name.equals(RESPONSE_STATUS)) {
status = value;
} else if (name.equals(VERSION)) {
version = value;
} else if (!isProhibitedHeader(protocol, name)) { // Don't write forbidden headers!
headersBuilder.add(name.utf8(), value);
}
start = end + 1;
}
}
if (status == null) throw new ProtocolException("Expected ':status' header not present");
StatusLine statusLine = StatusLine.parse(version + " " + status);
return new Response.Builder()
.protocol(protocol)
.code(statusLine.code)
.message(statusLine.message)
.headers(headersBuilder.build());
}
@Override public ResponseBody openResponseBody(Response response) throws IOException {
return new RealResponseBody(response.headers(), Okio.buffer(stream.getSource()));
}
@Override public void releaseConnectionOnIdle() {
}
@Override public void disconnect(HttpEngine engine) throws IOException {
if (stream != null) stream.close(ErrorCode.CANCEL);
}
@Override public boolean canReuseConnection() {
return true; // TODO: spdyConnection.isClosed() ?
}
/** When true, this header should not be emitted or consumed. */
private static boolean isProhibitedHeader(Protocol protocol, ByteString name) {
if (protocol == Protocol.SPDY_3) {
return SPDY_3_PROHIBITED_HEADERS.contains(name);
} else if (protocol == Protocol.HTTP_2) {
return HTTP_2_PROHIBITED_HEADERS.contains(name);
} else {
throw new AssertionError(protocol);
}
}
}
