Java example source code file (DefaultRequestDirector.java)
The DefaultRequestDirector.java example source code/*
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* to you under the Apache License, Version 2.0 (the
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* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
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package org.apache.http.impl.client;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.apache.http.annotation.NotThreadSafe;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.ConnectionReuseStrategy;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.ProtocolException;
import org.apache.http.ProtocolVersion;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.AuthState;
import org.apache.http.auth.AuthenticationException;
import org.apache.http.auth.Credentials;
import org.apache.http.auth.MalformedChallengeException;
import org.apache.http.client.AuthenticationHandler;
import org.apache.http.client.RequestDirector;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.NonRepeatableRequestException;
import org.apache.http.client.RedirectException;
import org.apache.http.client.RedirectHandler;
import org.apache.http.client.UserTokenHandler;
import org.apache.http.client.methods.AbortableHttpRequest;
import org.apache.http.client.params.ClientPNames;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.client.utils.URIUtils;
import org.apache.http.conn.BasicManagedEntity;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.ClientConnectionRequest;
import org.apache.http.conn.ConnectionKeepAliveStrategy;
import org.apache.http.conn.ManagedClientConnection;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.routing.BasicRouteDirector;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.routing.HttpRouteDirector;
import org.apache.http.conn.routing.HttpRoutePlanner;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpProcessor;
import org.apache.http.protocol.HttpRequestExecutor;
/**
* Default implementation of {@link RequestDirector}.
* <p>
* The following parameters can be used to customize the behavior of this
* class:
* <ul>
* <li>{@link org.apache.http.params.CoreProtocolPNames#PROTOCOL_VERSION}
* <li>{@link org.apache.http.params.CoreProtocolPNames#STRICT_TRANSFER_ENCODING}
* <li>{@link org.apache.http.params.CoreProtocolPNames#HTTP_ELEMENT_CHARSET}
* <li>{@link org.apache.http.params.CoreProtocolPNames#USE_EXPECT_CONTINUE}
* <li>{@link org.apache.http.params.CoreProtocolPNames#WAIT_FOR_CONTINUE}
* <li>{@link org.apache.http.params.CoreProtocolPNames#USER_AGENT}
* <li>{@link org.apache.http.params.CoreConnectionPNames#SOCKET_BUFFER_SIZE}
* <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_LINE_LENGTH}
* <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_HEADER_COUNT}
* <li>{@link org.apache.http.params.CoreConnectionPNames#SO_TIMEOUT}
* <li>{@link org.apache.http.params.CoreConnectionPNames#SO_LINGER}
* <li>{@link org.apache.http.params.CoreConnectionPNames#TCP_NODELAY}
* <li>{@link org.apache.http.params.CoreConnectionPNames#CONNECTION_TIMEOUT}
* <li>{@link org.apache.http.params.CoreConnectionPNames#STALE_CONNECTION_CHECK}
* <li>{@link org.apache.http.conn.params.ConnRoutePNames#FORCED_ROUTE}
* <li>{@link org.apache.http.conn.params.ConnRoutePNames#LOCAL_ADDRESS}
* <li>{@link org.apache.http.conn.params.ConnRoutePNames#DEFAULT_PROXY}
* <li>{@link org.apache.http.conn.params.ConnManagerPNames#TIMEOUT}
* <li>{@link org.apache.http.conn.params.ConnManagerPNames#MAX_CONNECTIONS_PER_ROUTE}
* <li>{@link org.apache.http.conn.params.ConnManagerPNames#MAX_TOTAL_CONNECTIONS}
* <li>{@link org.apache.http.cookie.params.CookieSpecPNames#DATE_PATTERNS}
* <li>{@link org.apache.http.cookie.params.CookieSpecPNames#SINGLE_COOKIE_HEADER}
* <li>{@link org.apache.http.auth.params.AuthPNames#CREDENTIAL_CHARSET}
* <li>{@link org.apache.http.client.params.ClientPNames#COOKIE_POLICY}
* <li>{@link org.apache.http.client.params.ClientPNames#HANDLE_AUTHENTICATION}
* <li>{@link org.apache.http.client.params.ClientPNames#HANDLE_REDIRECTS}
* <li>{@link org.apache.http.client.params.ClientPNames#MAX_REDIRECTS}
* <li>{@link org.apache.http.client.params.ClientPNames#ALLOW_CIRCULAR_REDIRECTS}
* <li>{@link org.apache.http.client.params.ClientPNames#VIRTUAL_HOST}
* <li>{@link org.apache.http.client.params.ClientPNames#DEFAULT_HOST}
* <li>{@link org.apache.http.client.params.ClientPNames#DEFAULT_HEADERS}
* </ul>
*
* @since 4.0
*/
@NotThreadSafe // e.g. managedConn
public class DefaultRequestDirector implements RequestDirector {
private final Log log;
/** The connection manager. */
protected final ClientConnectionManager connManager;
/** The route planner. */
protected final HttpRoutePlanner routePlanner;
/** The connection re-use strategy. */
protected final ConnectionReuseStrategy reuseStrategy;
/** The keep-alive duration strategy. */
protected final ConnectionKeepAliveStrategy keepAliveStrategy;
/** The request executor. */
protected final HttpRequestExecutor requestExec;
/** The HTTP protocol processor. */
protected final HttpProcessor httpProcessor;
/** The request retry handler. */
protected final HttpRequestRetryHandler retryHandler;
/** The redirect handler. */
protected final RedirectHandler redirectHandler;
/** The target authentication handler. */
protected final AuthenticationHandler targetAuthHandler;
/** The proxy authentication handler. */
protected final AuthenticationHandler proxyAuthHandler;
/** The user token handler. */
protected final UserTokenHandler userTokenHandler;
/** The HTTP parameters. */
protected final HttpParams params;
/** The currently allocated connection. */
protected ManagedClientConnection managedConn;
protected final AuthState targetAuthState;
protected final AuthState proxyAuthState;
private int redirectCount;
private int maxRedirects;
private HttpHost virtualHost;
DefaultRequestDirector(
final Log log,
final HttpRequestExecutor requestExec,
final ClientConnectionManager conman,
final ConnectionReuseStrategy reustrat,
final ConnectionKeepAliveStrategy kastrat,
final HttpRoutePlanner rouplan,
final HttpProcessor httpProcessor,
final HttpRequestRetryHandler retryHandler,
final RedirectHandler redirectHandler,
final AuthenticationHandler targetAuthHandler,
final AuthenticationHandler proxyAuthHandler,
final UserTokenHandler userTokenHandler,
final HttpParams params) {
if (log == null) {
throw new IllegalArgumentException
("Log may not be null.");
}
if (requestExec == null) {
throw new IllegalArgumentException
("Request executor may not be null.");
}
if (conman == null) {
throw new IllegalArgumentException
("Client connection manager may not be null.");
}
if (reustrat == null) {
throw new IllegalArgumentException
("Connection reuse strategy may not be null.");
}
if (kastrat == null) {
throw new IllegalArgumentException
("Connection keep alive strategy may not be null.");
}
if (rouplan == null) {
throw new IllegalArgumentException
("Route planner may not be null.");
}
if (httpProcessor == null) {
throw new IllegalArgumentException
("HTTP protocol processor may not be null.");
}
if (retryHandler == null) {
throw new IllegalArgumentException
("HTTP request retry handler may not be null.");
}
if (redirectHandler == null) {
throw new IllegalArgumentException
("Redirect handler may not be null.");
}
if (targetAuthHandler == null) {
throw new IllegalArgumentException
("Target authentication handler may not be null.");
}
if (proxyAuthHandler == null) {
throw new IllegalArgumentException
("Proxy authentication handler may not be null.");
}
if (userTokenHandler == null) {
throw new IllegalArgumentException
("User token handler may not be null.");
}
if (params == null) {
throw new IllegalArgumentException
("HTTP parameters may not be null");
}
this.log = log;
this.requestExec = requestExec;
this.connManager = conman;
this.reuseStrategy = reustrat;
this.keepAliveStrategy = kastrat;
this.routePlanner = rouplan;
this.httpProcessor = httpProcessor;
this.retryHandler = retryHandler;
this.redirectHandler = redirectHandler;
this.targetAuthHandler = targetAuthHandler;
this.proxyAuthHandler = proxyAuthHandler;
this.userTokenHandler = userTokenHandler;
this.params = params;
this.managedConn = null;
this.redirectCount = 0;
this.maxRedirects = this.params.getIntParameter(ClientPNames.MAX_REDIRECTS, 100);
this.targetAuthState = new AuthState();
this.proxyAuthState = new AuthState();
} // constructor
public DefaultRequestDirector(
final HttpRequestExecutor requestExec,
final ClientConnectionManager conman,
final ConnectionReuseStrategy reustrat,
final ConnectionKeepAliveStrategy kastrat,
final HttpRoutePlanner rouplan,
final HttpProcessor httpProcessor,
final HttpRequestRetryHandler retryHandler,
final RedirectHandler redirectHandler,
final AuthenticationHandler targetAuthHandler,
final AuthenticationHandler proxyAuthHandler,
final UserTokenHandler userTokenHandler,
final HttpParams params) {
this(LogFactory.getLog(DefaultRequestDirector.class),
requestExec,
conman,
reustrat,
kastrat,
rouplan,
httpProcessor,
retryHandler,
redirectHandler,
targetAuthHandler,
proxyAuthHandler,
userTokenHandler,
params);
}
private RequestWrapper wrapRequest(
final HttpRequest request) throws ProtocolException {
if (request instanceof HttpEntityEnclosingRequest) {
return new EntityEnclosingRequestWrapper(
(HttpEntityEnclosingRequest) request);
} else {
return new RequestWrapper(
request);
}
}
protected void rewriteRequestURI(
final RequestWrapper request,
final HttpRoute route) throws ProtocolException {
try {
URI uri = request.getURI();
if (route.getProxyHost() != null && !route.isTunnelled()) {
// Make sure the request URI is absolute
if (!uri.isAbsolute()) {
HttpHost target = route.getTargetHost();
uri = URIUtils.rewriteURI(uri, target);
request.setURI(uri);
}
} else {
// Make sure the request URI is relative
if (uri.isAbsolute()) {
uri = URIUtils.rewriteURI(uri, null);
request.setURI(uri);
}
}
} catch (URISyntaxException ex) {
throw new ProtocolException("Invalid URI: " +
request.getRequestLine().getUri(), ex);
}
}
// non-javadoc, see interface ClientRequestDirector
public HttpResponse execute(HttpHost target, HttpRequest request,
HttpContext context)
throws HttpException, IOException {
HttpRequest orig = request;
RequestWrapper origWrapper = wrapRequest(orig);
origWrapper.setParams(params);
HttpRoute origRoute = determineRoute(target, origWrapper, context);
virtualHost = (HttpHost) orig.getParams().getParameter(
ClientPNames.VIRTUAL_HOST);
RoutedRequest roureq = new RoutedRequest(origWrapper, origRoute);
long timeout = ConnManagerParams.getTimeout(params);
int execCount = 0;
boolean reuse = false;
boolean done = false;
try {
HttpResponse response = null;
while (!done) {
// In this loop, the RoutedRequest may be replaced by a
// followup request and route. The request and route passed
// in the method arguments will be replaced. The original
// request is still available in 'orig'.
RequestWrapper wrapper = roureq.getRequest();
HttpRoute route = roureq.getRoute();
response = null;
// See if we have a user token bound to the execution context
Object userToken = context.getAttribute(ClientContext.USER_TOKEN);
// Allocate connection if needed
if (managedConn == null) {
ClientConnectionRequest connRequest = connManager.requestConnection(
route, userToken);
if (orig instanceof AbortableHttpRequest) {
((AbortableHttpRequest) orig).setConnectionRequest(connRequest);
}
try {
managedConn = connRequest.getConnection(timeout, TimeUnit.MILLISECONDS);
} catch(InterruptedException interrupted) {
InterruptedIOException iox = new InterruptedIOException();
iox.initCause(interrupted);
throw iox;
}
if (HttpConnectionParams.isStaleCheckingEnabled(params)) {
// validate connection
if (managedConn.isOpen()) {
this.log.debug("Stale connection check");
if (managedConn.isStale()) {
this.log.debug("Stale connection detected");
managedConn.close();
}
}
}
}
if (orig instanceof AbortableHttpRequest) {
((AbortableHttpRequest) orig).setReleaseTrigger(managedConn);
}
// Reopen connection if needed
if (!managedConn.isOpen()) {
managedConn.open(route, context, params);
} else {
managedConn.setSocketTimeout(HttpConnectionParams.getSoTimeout(params));
}
try {
establishRoute(route, context);
} catch (TunnelRefusedException ex) {
if (this.log.isDebugEnabled()) {
this.log.debug(ex.getMessage());
}
response = ex.getResponse();
break;
}
// Reset headers on the request wrapper
wrapper.resetHeaders();
// Re-write request URI if needed
rewriteRequestURI(wrapper, route);
// Use virtual host if set
target = virtualHost;
if (target == null) {
target = route.getTargetHost();
}
HttpHost proxy = route.getProxyHost();
// Populate the execution context
context.setAttribute(ExecutionContext.HTTP_TARGET_HOST,
target);
context.setAttribute(ExecutionContext.HTTP_PROXY_HOST,
proxy);
context.setAttribute(ExecutionContext.HTTP_CONNECTION,
managedConn);
context.setAttribute(ClientContext.TARGET_AUTH_STATE,
targetAuthState);
context.setAttribute(ClientContext.PROXY_AUTH_STATE,
proxyAuthState);
// Run request protocol interceptors
requestExec.preProcess(wrapper, httpProcessor, context);
boolean retrying = true;
Exception retryReason = null;
while (retrying) {
// Increment total exec count (with redirects)
execCount++;
// Increment exec count for this particular request
wrapper.incrementExecCount();
if (!wrapper.isRepeatable()) {
this.log.debug("Cannot retry non-repeatable request");
if (retryReason != null) {
throw new NonRepeatableRequestException("Cannot retry request " +
"with a non-repeatable request entity. The cause lists the " +
"reason the original request failed.", retryReason);
} else {
throw new NonRepeatableRequestException("Cannot retry request " +
"with a non-repeatable request entity.");
}
}
try {
if (this.log.isDebugEnabled()) {
this.log.debug("Attempt " + execCount + " to execute request");
}
response = requestExec.execute(wrapper, managedConn, context);
retrying = false;
} catch (IOException ex) {
this.log.debug("Closing the connection.");
managedConn.close();
if (retryHandler.retryRequest(ex, wrapper.getExecCount(), context)) {
if (this.log.isInfoEnabled()) {
this.log.info("I/O exception ("+ ex.getClass().getName() +
") caught when processing request: "
+ ex.getMessage());
}
if (this.log.isDebugEnabled()) {
this.log.debug(ex.getMessage(), ex);
}
this.log.info("Retrying request");
retryReason = ex;
} else {
throw ex;
}
// If we have a direct route to the target host
// just re-open connection and re-try the request
if (!route.isTunnelled()) {
this.log.debug("Reopening the direct connection.");
managedConn.open(route, context, params);
} else {
// otherwise give up
this.log.debug("Proxied connection. Need to start over.");
retrying = false;
}
}
}
if (response == null) {
// Need to start over
continue;
}
// Run response protocol interceptors
response.setParams(params);
requestExec.postProcess(response, httpProcessor, context);
// The connection is in or can be brought to a re-usable state.
reuse = reuseStrategy.keepAlive(response, context);
if (reuse) {
// Set the idle duration of this connection
long duration = keepAliveStrategy.getKeepAliveDuration(response, context);
managedConn.setIdleDuration(duration, TimeUnit.MILLISECONDS);
if (this.log.isDebugEnabled()) {
if (duration >= 0) {
this.log.debug("Connection can be kept alive for " + duration + " ms");
} else {
this.log.debug("Connection can be kept alive indefinitely");
}
}
}
RoutedRequest followup = handleResponse(roureq, response, context);
if (followup == null) {
done = true;
} else {
if (reuse) {
// Make sure the response body is fully consumed, if present
HttpEntity entity = response.getEntity();
if (entity != null) {
entity.consumeContent();
}
// entity consumed above is not an auto-release entity,
// need to mark the connection re-usable explicitly
managedConn.markReusable();
} else {
managedConn.close();
}
// check if we can use the same connection for the followup
if (!followup.getRoute().equals(roureq.getRoute())) {
releaseConnection();
}
roureq = followup;
}
if (managedConn != null && userToken == null) {
userToken = userTokenHandler.getUserToken(context);
context.setAttribute(ClientContext.USER_TOKEN, userToken);
if (userToken != null) {
managedConn.setState(userToken);
}
}
} // while not done
// check for entity, release connection if possible
if ((response == null) || (response.getEntity() == null) ||
!response.getEntity().isStreaming()) {
// connection not needed and (assumed to be) in re-usable state
if (reuse)
managedConn.markReusable();
releaseConnection();
} else {
// install an auto-release entity
HttpEntity entity = response.getEntity();
entity = new BasicManagedEntity(entity, managedConn, reuse);
response.setEntity(entity);
}
return response;
} catch (HttpException ex) {
abortConnection();
throw ex;
} catch (IOException ex) {
abortConnection();
throw ex;
} catch (RuntimeException ex) {
abortConnection();
throw ex;
}
} // execute
/**
* Returns the connection back to the connection manager
* and prepares for retrieving a new connection during
* the next request.
*/
protected void releaseConnection() {
// Release the connection through the ManagedConnection instead of the
// ConnectionManager directly. This lets the connection control how
// it is released.
try {
managedConn.releaseConnection();
} catch(IOException ignored) {
this.log.debug("IOException releasing connection", ignored);
}
managedConn = null;
}
/**
* Determines the route for a request.
* Called by {@link #execute}
* to determine the route for either the original or a followup request.
*
* @param target the target host for the request.
* Implementations may accept <code>null
* if they can still determine a route, for example
* to a default target or by inspecting the request.
* @param request the request to execute
* @param context the context to use for the execution,
* never <code>null
*
* @return the route the request should take
*
* @throws HttpException in case of a problem
*/
protected HttpRoute determineRoute(HttpHost target,
HttpRequest request,
HttpContext context)
throws HttpException {
if (target == null) {
target = (HttpHost) request.getParams().getParameter(
ClientPNames.DEFAULT_HOST);
}
if (target == null) {
throw new IllegalStateException
("Target host must not be null, or set in parameters.");
}
return this.routePlanner.determineRoute(target, request, context);
}
/**
* Establishes the target route.
*
* @param route the route to establish
* @param context the context for the request execution
*
* @throws HttpException in case of a problem
* @throws IOException in case of an IO problem
*/
protected void establishRoute(HttpRoute route, HttpContext context)
throws HttpException, IOException {
HttpRouteDirector rowdy = new BasicRouteDirector();
int step;
do {
HttpRoute fact = managedConn.getRoute();
step = rowdy.nextStep(route, fact);
switch (step) {
case HttpRouteDirector.CONNECT_TARGET:
case HttpRouteDirector.CONNECT_PROXY:
managedConn.open(route, context, this.params);
break;
case HttpRouteDirector.TUNNEL_TARGET: {
boolean secure = createTunnelToTarget(route, context);
this.log.debug("Tunnel to target created.");
managedConn.tunnelTarget(secure, this.params);
} break;
case HttpRouteDirector.TUNNEL_PROXY: {
// The most simple example for this case is a proxy chain
// of two proxies, where P1 must be tunnelled to P2.
// route: Source -> P1 -> P2 -> Target (3 hops)
// fact: Source -> P1 -> Target (2 hops)
final int hop = fact.getHopCount()-1; // the hop to establish
boolean secure = createTunnelToProxy(route, hop, context);
this.log.debug("Tunnel to proxy created.");
managedConn.tunnelProxy(route.getHopTarget(hop),
secure, this.params);
} break;
case HttpRouteDirector.LAYER_PROTOCOL:
managedConn.layerProtocol(context, this.params);
break;
case HttpRouteDirector.UNREACHABLE:
throw new IllegalStateException
("Unable to establish route." +
"\nplanned = " + route +
"\ncurrent = " + fact);
case HttpRouteDirector.COMPLETE:
// do nothing
break;
default:
throw new IllegalStateException
("Unknown step indicator "+step+" from RouteDirector.");
} // switch
} while (step > HttpRouteDirector.COMPLETE);
} // establishConnection
/**
* Creates a tunnel to the target server.
* The connection must be established to the (last) proxy.
* A CONNECT request for tunnelling through the proxy will
* be created and sent, the response received and checked.
* This method does <i>not update the connection with
* information about the tunnel, that is left to the caller.
*
* @param route the route to establish
* @param context the context for request execution
*
* @return <code>true if the tunnelled route is secure,
* <code>false otherwise.
* The implementation here always returns <code>false,
* but derived classes may override.
*
* @throws HttpException in case of a problem
* @throws IOException in case of an IO problem
*/
protected boolean createTunnelToTarget(HttpRoute route,
HttpContext context)
throws HttpException, IOException {
HttpHost proxy = route.getProxyHost();
HttpHost target = route.getTargetHost();
HttpResponse response = null;
boolean done = false;
while (!done) {
done = true;
if (!this.managedConn.isOpen()) {
this.managedConn.open(route, context, this.params);
}
HttpRequest connect = createConnectRequest(route, context);
connect.setParams(this.params);
// Populate the execution context
context.setAttribute(ExecutionContext.HTTP_TARGET_HOST,
target);
context.setAttribute(ExecutionContext.HTTP_PROXY_HOST,
proxy);
context.setAttribute(ExecutionContext.HTTP_CONNECTION,
managedConn);
context.setAttribute(ClientContext.TARGET_AUTH_STATE,
targetAuthState);
context.setAttribute(ClientContext.PROXY_AUTH_STATE,
proxyAuthState);
context.setAttribute(ExecutionContext.HTTP_REQUEST,
connect);
this.requestExec.preProcess(connect, this.httpProcessor, context);
response = this.requestExec.execute(connect, this.managedConn, context);
response.setParams(this.params);
this.requestExec.postProcess(response, this.httpProcessor, context);
int status = response.getStatusLine().getStatusCode();
if (status < 200) {
throw new HttpException("Unexpected response to CONNECT request: " +
response.getStatusLine());
}
CredentialsProvider credsProvider = (CredentialsProvider)
context.getAttribute(ClientContext.CREDS_PROVIDER);
if (credsProvider != null && HttpClientParams.isAuthenticating(params)) {
if (this.proxyAuthHandler.isAuthenticationRequested(response, context)) {
this.log.debug("Proxy requested authentication");
Map<String, Header> challenges = this.proxyAuthHandler.getChallenges(
response, context);
try {
processChallenges(
challenges, this.proxyAuthState, this.proxyAuthHandler,
response, context);
} catch (AuthenticationException ex) {
if (this.log.isWarnEnabled()) {
this.log.warn("Authentication error: " + ex.getMessage());
break;
}
}
updateAuthState(this.proxyAuthState, proxy, credsProvider);
if (this.proxyAuthState.getCredentials() != null) {
done = false;
// Retry request
if (this.reuseStrategy.keepAlive(response, context)) {
this.log.debug("Connection kept alive");
// Consume response content
HttpEntity entity = response.getEntity();
if (entity != null) {
entity.consumeContent();
}
} else {
this.managedConn.close();
}
}
} else {
// Reset proxy auth scope
this.proxyAuthState.setAuthScope(null);
}
}
}
int status = response.getStatusLine().getStatusCode(); // can't be null
if (status > 299) {
// Buffer response content
HttpEntity entity = response.getEntity();
if (entity != null) {
response.setEntity(new BufferedHttpEntity(entity));
}
this.managedConn.close();
throw new TunnelRefusedException("CONNECT refused by proxy: " +
response.getStatusLine(), response);
}
this.managedConn.markReusable();
// How to decide on security of the tunnelled connection?
// The socket factory knows only about the segment to the proxy.
// Even if that is secure, the hop to the target may be insecure.
// Leave it to derived classes, consider insecure by default here.
return false;
} // createTunnelToTarget
/**
* Creates a tunnel to an intermediate proxy.
* This method is <i>not implemented in this class.
* It just throws an exception here.
*
* @param route the route to establish
* @param hop the hop in the route to establish now.
* <code>route.getHopTarget(hop)
* will return the proxy to tunnel to.
* @param context the context for request execution
*
* @return <code>true if the partially tunnelled connection
* is secure, <code>false otherwise.
*
* @throws HttpException in case of a problem
* @throws IOException in case of an IO problem
*/
protected boolean createTunnelToProxy(HttpRoute route, int hop,
HttpContext context)
throws HttpException, IOException {
// Have a look at createTunnelToTarget and replicate the parts
// you need in a custom derived class. If your proxies don't require
// authentication, it is not too hard. But for the stock version of
// HttpClient, we cannot make such simplifying assumptions and would
// have to include proxy authentication code. The HttpComponents team
// is currently not in a position to support rarely used code of this
// complexity. Feel free to submit patches that refactor the code in
// createTunnelToTarget to facilitate re-use for proxy tunnelling.
throw new UnsupportedOperationException
("Proxy chains are not supported.");
}
/**
* Creates the CONNECT request for tunnelling.
* Called by {@link #createTunnelToTarget createTunnelToTarget}.
*
* @param route the route to establish
* @param context the context for request execution
*
* @return the CONNECT request for tunnelling
*/
protected HttpRequest createConnectRequest(HttpRoute route,
HttpContext context) {
// see RFC 2817, section 5.2 and
// INTERNET-DRAFT: Tunneling TCP based protocols through
// Web proxy servers
HttpHost target = route.getTargetHost();
String host = target.getHostName();
int port = target.getPort();
if (port < 0) {
Scheme scheme = connManager.getSchemeRegistry().
getScheme(target.getSchemeName());
port = scheme.getDefaultPort();
}
StringBuilder buffer = new StringBuilder(host.length() + 6);
buffer.append(host);
buffer.append(':');
buffer.append(Integer.toString(port));
String authority = buffer.toString();
ProtocolVersion ver = HttpProtocolParams.getVersion(params);
HttpRequest req = new BasicHttpRequest
("CONNECT", authority, ver);
return req;
}
/**
* Analyzes a response to check need for a followup.
*
* @param roureq the request and route.
* @param response the response to analayze
* @param context the context used for the current request execution
*
* @return the followup request and route if there is a followup, or
* <code>null if the response should be returned as is
*
* @throws HttpException in case of a problem
* @throws IOException in case of an IO problem
*/
protected RoutedRequest handleResponse(RoutedRequest roureq,
HttpResponse response,
HttpContext context)
throws HttpException, IOException {
HttpRoute route = roureq.getRoute();
RequestWrapper request = roureq.getRequest();
HttpParams params = request.getParams();
if (HttpClientParams.isRedirecting(params) &&
this.redirectHandler.isRedirectRequested(response, context)) {
if (redirectCount >= maxRedirects) {
throw new RedirectException("Maximum redirects ("
+ maxRedirects + ") exceeded");
}
redirectCount++;
// Virtual host cannot be used any longer
virtualHost = null;
URI uri = this.redirectHandler.getLocationURI(response, context);
HttpHost newTarget = new HttpHost(
uri.getHost(),
uri.getPort(),
uri.getScheme());
// Unset auth scope
targetAuthState.setAuthScope(null);
proxyAuthState.setAuthScope(null);
// Invalidate auth states if redirecting to another host
if (!route.getTargetHost().equals(newTarget)) {
targetAuthState.invalidate();
AuthScheme authScheme = proxyAuthState.getAuthScheme();
if (authScheme != null && authScheme.isConnectionBased()) {
proxyAuthState.invalidate();
}
}
HttpRedirect redirect = new HttpRedirect(request.getMethod(), uri);
HttpRequest orig = request.getOriginal();
redirect.setHeaders(orig.getAllHeaders());
RequestWrapper wrapper = new RequestWrapper(redirect);
wrapper.setParams(params);
HttpRoute newRoute = determineRoute(newTarget, wrapper, context);
RoutedRequest newRequest = new RoutedRequest(wrapper, newRoute);
if (this.log.isDebugEnabled()) {
this.log.debug("Redirecting to '" + uri + "' via " + newRoute);
}
return newRequest;
}
CredentialsProvider credsProvider = (CredentialsProvider)
context.getAttribute(ClientContext.CREDS_PROVIDER);
if (credsProvider != null && HttpClientParams.isAuthenticating(params)) {
if (this.targetAuthHandler.isAuthenticationRequested(response, context)) {
HttpHost target = (HttpHost)
context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
if (target == null) {
target = route.getTargetHost();
}
this.log.debug("Target requested authentication");
Map<String, Header> challenges = this.targetAuthHandler.getChallenges(
response, context);
try {
processChallenges(challenges,
this.targetAuthState, this.targetAuthHandler,
response, context);
} catch (AuthenticationException ex) {
if (this.log.isWarnEnabled()) {
this.log.warn("Authentication error: " + ex.getMessage());
return null;
}
}
updateAuthState(this.targetAuthState, target, credsProvider);
if (this.targetAuthState.getCredentials() != null) {
// Re-try the same request via the same route
return roureq;
} else {
return null;
}
} else {
// Reset target auth scope
this.targetAuthState.setAuthScope(null);
}
if (this.proxyAuthHandler.isAuthenticationRequested(response, context)) {
HttpHost proxy = route.getProxyHost();
this.log.debug("Proxy requested authentication");
Map<String, Header> challenges = this.proxyAuthHandler.getChallenges(
response, context);
try {
processChallenges(challenges,
this.proxyAuthState, this.proxyAuthHandler,
response, context);
} catch (AuthenticationException ex) {
if (this.log.isWarnEnabled()) {
this.log.warn("Authentication error: " + ex.getMessage());
return null;
}
}
updateAuthState(this.proxyAuthState, proxy, credsProvider);
if (this.proxyAuthState.getCredentials() != null) {
// Re-try the same request via the same route
return roureq;
} else {
return null;
}
} else {
// Reset proxy auth scope
this.proxyAuthState.setAuthScope(null);
}
}
return null;
} // handleResponse
/**
* Shuts down the connection.
* This method is called from a <code>catch block in
* {@link #execute execute} during exception handling.
*/
private void abortConnection() {
ManagedClientConnection mcc = managedConn;
if (mcc != null) {
// we got here as the result of an exception
// no response will be returned, release the connection
managedConn = null;
try {
mcc.abortConnection();
} catch (IOException ex) {
if (this.log.isDebugEnabled()) {
this.log.debug(ex.getMessage(), ex);
}
}
// ensure the connection manager properly releases this connection
try {
mcc.releaseConnection();
} catch(IOException ignored) {
this.log.debug("Error releasing connection", ignored);
}
}
} // abortConnection
private void processChallenges(
final Map<String, Header> challenges,
final AuthState authState,
final AuthenticationHandler authHandler,
final HttpResponse response,
final HttpContext context)
throws MalformedChallengeException, AuthenticationException {
AuthScheme authScheme = authState.getAuthScheme();
if (authScheme == null) {
// Authentication not attempted before
authScheme = authHandler.selectScheme(challenges, response, context);
authState.setAuthScheme(authScheme);
}
String id = authScheme.getSchemeName();
Header challenge = challenges.get(id.toLowerCase(Locale.ENGLISH));
if (challenge == null) {
throw new AuthenticationException(id +
" authorization challenge expected, but not found");
}
authScheme.processChallenge(challenge);
this.log.debug("Authorization challenge processed");
}
private void updateAuthState(
final AuthState authState,
final HttpHost host,
final CredentialsProvider credsProvider) {
if (!authState.isValid()) {
return;
}
String hostname = host.getHostName();
int port = host.getPort();
if (port < 0) {
Scheme scheme = connManager.getSchemeRegistry().getScheme(host);
port = scheme.getDefaultPort();
}
AuthScheme authScheme = authState.getAuthScheme();
AuthScope authScope = new AuthScope(
hostname,
port,
authScheme.getRealm(),
authScheme.getSchemeName());
if (this.log.isDebugEnabled()) {
this.log.debug("Authentication scope: " + authScope);
}
Credentials creds = authState.getCredentials();
if (creds == null) {
creds = credsProvider.getCredentials(authScope);
if (this.log.isDebugEnabled()) {
if (creds != null) {
this.log.debug("Found credentials");
} else {
this.log.debug("Credentials not found");
}
}
} else {
if (authScheme.isComplete()) {
this.log.debug("Authentication failed");
creds = null;
}
}
authState.setAuthScope(authScope);
authState.setCredentials(creds);
}
} // class DefaultClientRequestDirector
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