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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and
asynchronously process the HTTP responses.
/*
* Copyright (c) 2014-2015 AsyncHttpClient Project. All rights reserved.
*
* This program is licensed to you under the Apache License Version 2.0,
* and you may not use this file except in compliance with the Apache License Version 2.0.
* You may obtain a copy of the Apache License Version 2.0 at
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the Apache License Version 2.0 is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
*/
package com.ning.http.client.providers.netty.handler;
import static com.ning.http.util.AsyncHttpProviderUtils.getNTLM;
import static com.ning.http.util.AsyncHttpProviderUtils.getDefaultPort;
import static com.ning.http.util.MiscUtils.isNonEmpty;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.OK;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.PROXY_AUTHENTICATION_REQUIRED;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.UNAUTHORIZED;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.handler.codec.http.HttpChunk;
import org.jboss.netty.handler.codec.http.HttpChunkTrailer;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpResponse;
import com.ning.http.client.AsyncHandler;
import com.ning.http.client.AsyncHandler.STATE;
import com.ning.http.client.AsyncHttpClientConfig;
import com.ning.http.client.FluentCaseInsensitiveStringsMap;
import com.ning.http.client.ProxyServer;
import com.ning.http.client.Realm;
import com.ning.http.client.Realm.AuthScheme;
import com.ning.http.client.Request;
import com.ning.http.client.RequestBuilder;
import com.ning.http.client.ntlm.NTLMEngine;
import com.ning.http.client.ntlm.NTLMEngineException;
import com.ning.http.client.providers.netty.NettyAsyncHttpProviderConfig;
import com.ning.http.client.providers.netty.channel.ChannelManager;
import com.ning.http.client.providers.netty.future.NettyResponseFuture;
import com.ning.http.client.providers.netty.request.NettyRequestSender;
import com.ning.http.client.providers.netty.response.NettyResponseBodyPart;
import com.ning.http.client.providers.netty.response.NettyResponseHeaders;
import com.ning.http.client.providers.netty.response.NettyResponseStatus;
import com.ning.http.client.spnego.SpnegoEngine;
import com.ning.http.client.uri.Uri;
import java.io.IOException;
import java.util.List;
public final class HttpProtocol extends Protocol {
private final ConnectionStrategy connectionStrategy;
public HttpProtocol(ChannelManager channelManager, AsyncHttpClientConfig config, NettyAsyncHttpProviderConfig nettyConfig,
NettyRequestSender requestSender) {
super(channelManager, config, nettyConfig, requestSender);
connectionStrategy = nettyConfig.getConnectionStrategy();
}
private Realm kerberosChallenge(Channel channel,//
List authHeaders,//
Request request,//
FluentCaseInsensitiveStringsMap headers,//
Realm realm,//
NettyResponseFuture future) throws NTLMEngineException {
Uri uri = request.getUri();
String host = request.getVirtualHost() == null ? uri.getHost() : request.getVirtualHost();
try {
String challengeHeader = SpnegoEngine.INSTANCE.generateToken(host);
headers.remove(HttpHeaders.Names.AUTHORIZATION);
headers.add(HttpHeaders.Names.AUTHORIZATION, "Negotiate " + challengeHeader);
return new Realm.RealmBuilder().clone(realm)//
.setUri(uri)//
.setMethodName(request.getMethod())//
.setScheme(Realm.AuthScheme.KERBEROS)//
.build();
} catch (Throwable throwable) {
String ntlmAuthenticate = getNTLM(authHeaders);
if (ntlmAuthenticate != null) {
return ntlmChallenge(ntlmAuthenticate, request, headers, realm, future);
}
requestSender.abort(channel, future, throwable);
return null;
}
}
private Realm kerberosProxyChallenge(Channel channel,//
List proxyAuth,//
Request request,//
ProxyServer proxyServer,//
FluentCaseInsensitiveStringsMap headers,//
NettyResponseFuture future) throws NTLMEngineException {
Uri uri = request.getUri();
try {
String challengeHeader = SpnegoEngine.INSTANCE.generateToken(proxyServer.getHost());
headers.remove(HttpHeaders.Names.AUTHORIZATION);
headers.add(HttpHeaders.Names.AUTHORIZATION, "Negotiate " + challengeHeader);
return proxyServer.realmBuilder()//
.setUri(uri)//
.setMethodName(request.getMethod())//
.setScheme(Realm.AuthScheme.KERBEROS)//
.build();
} catch (Throwable throwable) {
String ntlmAuthenticate = getNTLM(proxyAuth);
if (ntlmAuthenticate != null) {
return ntlmProxyChallenge(ntlmAuthenticate, request, proxyServer, headers, future);
}
requestSender.abort(channel, future, throwable);
return null;
}
}
private String authorizationHeaderName(boolean proxyInd) {
return proxyInd ? HttpHeaders.Names.PROXY_AUTHORIZATION : HttpHeaders.Names.AUTHORIZATION;
}
private void addNTLMAuthorizationHeader(FluentCaseInsensitiveStringsMap headers, String challengeHeader, boolean proxyInd) {
headers.add(authorizationHeaderName(proxyInd), "NTLM " + challengeHeader);
}
private Realm ntlmChallenge(String wwwAuth, Request request, FluentCaseInsensitiveStringsMap headers,
Realm realm, NettyResponseFuture future) throws NTLMEngineException {
Uri uri = request.getUri();
if (wwwAuth.equals("NTLM")) {
// server replied bare NTLM => we didn't preemptively sent Type1Msg
String challengeHeader = NTLMEngine.INSTANCE.generateType1Msg();
addNTLMAuthorizationHeader(headers, challengeHeader, false);
future.getAndSetAuth(false);
} else {
// probably receiving Type2Msg, so we issue Type3Msg
addType3NTLMAuthorizationHeader(wwwAuth, headers, realm, false);
}
return new Realm.RealmBuilder().clone(realm)//
.setUri(uri)//
.setMethodName(request.getMethod())//
.build();
}
private Realm ntlmProxyChallenge(String wwwAuth, Request request, ProxyServer proxyServer, FluentCaseInsensitiveStringsMap headers,
NettyResponseFuture future) throws NTLMEngineException {
future.getAndSetAuth(false);
headers.remove(HttpHeaders.Names.PROXY_AUTHORIZATION);
Realm realm = proxyServer.realmBuilder()//
.setScheme(AuthScheme.NTLM)//
.setUri(request.getUri())//
.setMethodName(request.getMethod()).build();
addType3NTLMAuthorizationHeader(wwwAuth, headers, realm, true);
return realm;
}
private void addType3NTLMAuthorizationHeader(String auth, FluentCaseInsensitiveStringsMap headers, Realm realm, boolean proxyInd) throws NTLMEngineException {
headers.remove(authorizationHeaderName(proxyInd));
if (isNonEmpty(auth) && auth.startsWith("NTLM ")) {
String serverChallenge = auth.substring("NTLM ".length()).trim();
String challengeHeader = NTLMEngine.INSTANCE.generateType3Msg(realm.getPrincipal(), realm.getPassword(), realm.getNtlmDomain(), realm.getNtlmHost(), serverChallenge);
addNTLMAuthorizationHeader(headers, challengeHeader, proxyInd);
}
}
private void finishUpdate(final NettyResponseFuture future, Channel channel, boolean expectOtherChunks) throws IOException {
// cancel timeouts asap so they don't trigger while draining the channel or offering to the pool
future.cancelTimeouts();
boolean keepAlive = future.isKeepAlive();
if (expectOtherChunks && keepAlive)
channelManager.drainChannelAndOffer(channel, future);
else
channelManager.tryToOfferChannelToPool(channel, keepAlive, future.getPartitionKey());
try {
future.done();
} catch (Throwable t) {
// Never propagate exception once we know we are done.
logger.debug(t.getMessage(), t);
}
}
private boolean updateBodyAndInterrupt(NettyResponseFuture future, AsyncHandler handler, NettyResponseBodyPart bodyPart)
throws Exception {
boolean interrupt = handler.onBodyPartReceived(bodyPart) != STATE.CONTINUE;
if (bodyPart.isUnderlyingConnectionToBeClosed())
future.setKeepAlive(false);
return interrupt;
}
private boolean exitAfterHandling401(//
final Channel channel,//
final NettyResponseFuture future,//
HttpResponse response,//
final Request request,//
int statusCode,//
Realm realm) throws Exception {
if (statusCode == UNAUTHORIZED.getCode() && realm != null && !future.getAndSetAuth(true)) {
List authHeaders = response.headers().getAll(HttpHeaders.Names.WWW_AUTHENTICATE);
if (!authHeaders.isEmpty()) {
future.setState(NettyResponseFuture.STATE.NEW);
Realm newRealm = null;
boolean negociate = authHeaders.contains("Negotiate");
String ntlmAuthenticate = getNTLM(authHeaders);
if (!authHeaders.contains("Kerberos") && ntlmAuthenticate != null) {
// NTLM
newRealm = ntlmChallenge(ntlmAuthenticate, request, request.getHeaders(), realm, future);
} else if (negociate) {
// SPNEGO KERBEROS
newRealm = kerberosChallenge(channel, authHeaders, request, request.getHeaders(), realm, future);
if (newRealm == null)
return true;
} else {
// BASIC or DIGEST
newRealm = new Realm.RealmBuilder().clone(realm)//
.setUri(request.getUri())//
.setMethodName(request.getMethod())//
.setUsePreemptiveAuth(true)//
.parseWWWAuthenticateHeader(authHeaders.get(0))//
.build();
}
final Request nextRequest = new RequestBuilder(future.getRequest()).setHeaders(request.getHeaders()).setRealm(newRealm).build();
logger.debug("Sending authentication to {}", request.getUri());
if (future.isKeepAlive() && !HttpHeaders.isTransferEncodingChunked(response) && !response.isChunked()) {
future.setReuseChannel(true);
} else {
channelManager.closeChannel(channel);
}
requestSender.sendNextRequest(nextRequest, future);
return true;
}
}
return false;
}
private boolean exitAfterHandling100(final Channel channel, final NettyResponseFuture future, int statusCode) {
if (statusCode == CONTINUE.getCode()) {
future.setHeadersAlreadyWrittenOnContinue(true);
future.setDontWriteBodyBecauseExpectContinue(false);
// FIXME why not reuse the channel?
requestSender.writeRequest(future, channel);
return true;
}
return false;
}
private boolean exitAfterHandling407(//
final Channel channel,//
final NettyResponseFuture future,//
HttpResponse response,//
Request request,//
int statusCode,//
ProxyServer proxyServer) throws Exception {
if (statusCode == PROXY_AUTHENTICATION_REQUIRED.getCode() && proxyServer != null && !future.getAndSetAuth(true)) {
List proxyAuthHeaders = response.headers().getAll(HttpHeaders.Names.PROXY_AUTHENTICATE);
if (!proxyAuthHeaders.isEmpty()) {
logger.debug("Sending proxy authentication to {}", request.getUri());
future.setState(NettyResponseFuture.STATE.NEW);
Realm newRealm = null;
FluentCaseInsensitiveStringsMap requestHeaders = request.getHeaders();
boolean negociate = proxyAuthHeaders.contains("Negotiate");
String ntlmAuthenticate = getNTLM(proxyAuthHeaders);
if (!proxyAuthHeaders.contains("Kerberos") && ntlmAuthenticate != null) {
// NTLM
newRealm = ntlmProxyChallenge(ntlmAuthenticate, request, proxyServer, requestHeaders, future);
} else if (negociate) {
// SPNEGO KERBEROS
newRealm = kerberosProxyChallenge(channel, proxyAuthHeaders, request, proxyServer, requestHeaders, future);
if (newRealm == null)
return true;
} else {
// BASIC or DIGEST
newRealm = proxyServer.realmBuilder()
.setUri(request.getUri())//
.setOmitQuery(true)//
.setMethodName(request.getMethod())//
.setUsePreemptiveAuth(true)//
.parseProxyAuthenticateHeader(proxyAuthHeaders.get(0))//
.build();
}
final Request nextRequest = new RequestBuilder(future.getRequest()).setHeaders(request.getHeaders()).setRealm(newRealm).build();
logger.debug("Sending proxy authentication to {}", request.getUri());
if (future.isKeepAlive() && !HttpHeaders.isTransferEncodingChunked(response) && !response.isChunked()) {
future.setConnectAllowed(true);
future.setReuseChannel(true);
} else {
channelManager.closeChannel(channel);
}
requestSender.sendNextRequest(nextRequest, future);
return true;
}
}
return false;
}
private boolean exitAfterHandlingConnect(//
final Channel channel,//
final NettyResponseFuture future,//
final Request request,//
ProxyServer proxyServer,//
int statusCode,//
HttpRequest httpRequest) throws IOException {
if (statusCode == OK.getCode() && httpRequest.getMethod() == HttpMethod.CONNECT) {
if (future.isKeepAlive())
future.attachChannel(channel, true);
try {
Uri requestUri = request.getUri();
String scheme = requestUri.getScheme();
String host = requestUri.getHost();
int port = getDefaultPort(requestUri);
logger.debug("Connecting to proxy {} for scheme {}", proxyServer, scheme);
channelManager.upgradeProtocol(channel.getPipeline(), scheme, host, port);
} catch (Throwable ex) {
requestSender.abort(channel, future, ex);
}
future.setReuseChannel(true);
future.setConnectAllowed(false);
requestSender.sendNextRequest(new RequestBuilder(future.getRequest()).build(), future);
return true;
}
return false;
}
private boolean exitAfterHandlingStatus(Channel channel, NettyResponseFuture future, HttpResponse response, AsyncHandler handler,
NettyResponseStatus status) throws IOException, Exception {
if (!future.getAndSetStatusReceived(true) && handler.onStatusReceived(status) != STATE.CONTINUE) {
finishUpdate(future, channel, HttpHeaders.isTransferEncodingChunked(response));
return true;
}
return false;
}
private boolean exitAfterHandlingHeaders(Channel channel, NettyResponseFuture future, HttpResponse response,
AsyncHandler handler, NettyResponseHeaders responseHeaders) throws IOException, Exception {
if (!response.headers().isEmpty() && handler.onHeadersReceived(responseHeaders) != STATE.CONTINUE) {
finishUpdate(future, channel, HttpHeaders.isTransferEncodingChunked(response));
return true;
}
return false;
}
// Netty 3: if the response is not chunked, the full body comes with the response
private boolean exitAfterHandlingBody(Channel channel, NettyResponseFuture future, HttpResponse response, AsyncHandler handler)
throws Exception {
if (!response.isChunked()) {
// no chunks expected, exiting
if (response.getContent().readableBytes() > 0)
// FIXME no need to notify an empty bodypart?
updateBodyAndInterrupt(future, handler, new NettyResponseBodyPart(response, null, true));
finishUpdate(future, channel, false);
return true;
}
return false;
}
private boolean handleHttpResponse(final HttpResponse response,//
final Channel channel,//
final NettyResponseFuture future,//
AsyncHandler handler) throws Exception {
HttpRequest httpRequest = future.getNettyRequest().getHttpRequest();
ProxyServer proxyServer = future.getProxyServer();
logger.debug("\n\nRequest {}\n\nResponse {}\n", httpRequest, response);
// store the original headers so we can re-send all them to
// the handler in case of trailing headers
future.setHttpHeaders(response.headers());
future.setKeepAlive(connectionStrategy.keepAlive(httpRequest, response));
NettyResponseStatus status = new NettyResponseStatus(future.getUri(), config, response);
int statusCode = response.getStatus().getCode();
Request request = future.getRequest();
Realm realm = request.getRealm() != null ? request.getRealm() : config.getRealm();
NettyResponseHeaders responseHeaders = new NettyResponseHeaders(response.headers());
return exitAfterProcessingFilters(channel, future, handler, status, responseHeaders)
|| exitAfterHandling401(channel, future, response, request, statusCode, realm) || //
exitAfterHandling407(channel, future, response, request, statusCode, proxyServer) || //
exitAfterHandling100(channel, future, statusCode) || //
exitAfterHandlingRedirect(channel, future, response, request, statusCode, realm) || //
exitAfterHandlingConnect(channel, future, request, proxyServer, statusCode, httpRequest) || //
exitAfterHandlingStatus(channel, future, response, handler, status) || //
exitAfterHandlingHeaders(channel, future, response, handler, responseHeaders) || //
exitAfterHandlingBody(channel, future, response, handler);
}
private void handleChunk(HttpChunk chunk,//
final Channel channel,//
final NettyResponseFuture future,//
AsyncHandler handler) throws IOException, Exception {
boolean last = chunk.isLast();
// we don't notify updateBodyAndInterrupt with the last chunk as it's empty
if (last || updateBodyAndInterrupt(future, handler, new NettyResponseBodyPart(null, chunk, last))) {
// only possible if last is true
if (chunk instanceof HttpChunkTrailer) {
HttpChunkTrailer chunkTrailer = (HttpChunkTrailer) chunk;
if (!chunkTrailer.trailingHeaders().isEmpty()) {
NettyResponseHeaders responseHeaders = new NettyResponseHeaders(future.getHttpHeaders(), chunkTrailer.trailingHeaders());
handler.onHeadersReceived(responseHeaders);
}
}
finishUpdate(future, channel, !chunk.isLast());
}
}
@Override
public void handle(final Channel channel, final NettyResponseFuture future, final Object e) throws Exception {
future.touch();
// future is already done because of an exception or a timeout
if (future.isDone()) {
// FIXME isn't the channel already properly closed?
channelManager.closeChannel(channel);
return;
}
AsyncHandler handler = future.getAsyncHandler();
try {
if (e instanceof HttpResponse) {
if (handleHttpResponse((HttpResponse) e, channel, future, handler))
return;
} else if (e instanceof HttpChunk)
handleChunk((HttpChunk) e, channel, future, handler);
} catch (Exception t) {
// e.g. an IOException when trying to open a connection and send the next request
if (hasIOExceptionFilters//
&& t instanceof IOException//
&& requestSender.applyIoExceptionFiltersAndReplayRequest(future, IOException.class.cast(t), channel)) {
return;
}
// FIXME Weird: close channel in abort, then close again
try {
requestSender.abort(channel, future, t);
} catch (Exception abortException) {
logger.debug("Abort failed", abortException);
} finally {
finishUpdate(future, channel, false);
}
throw t;
}
}
public void onError(NettyResponseFuture future, Throwable e) {
}
public void onClose(NettyResponseFuture future) {
}
}
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