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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing,
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
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*
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package org.apache.http.impl.execchain;
import java.io.IOException;
import java.net.URI;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.ProtocolException;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.auth.AuthState;
import org.apache.http.client.RedirectException;
import org.apache.http.client.RedirectStrategy;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpExecutionAware;
import org.apache.http.client.methods.HttpRequestWrapper;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.client.utils.URIUtils;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.routing.HttpRoutePlanner;
import org.apache.http.util.Args;
import org.apache.http.util.EntityUtils;
Request executor in the request execution chain that is responsible
for handling of request redirects.
Further responsibilities such as communication with the opposite
endpoint is delegated to the next executor in the request execution
chain.
Since: 4.3
/**
* Request executor in the request execution chain that is responsible
* for handling of request redirects.
* <p>
* Further responsibilities such as communication with the opposite
* endpoint is delegated to the next executor in the request execution
* chain.
* </p>
*
* @since 4.3
*/
@Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL)
public class RedirectExec implements ClientExecChain {
private final Log log = LogFactory.getLog(getClass());
private final ClientExecChain requestExecutor;
private final RedirectStrategy redirectStrategy;
private final HttpRoutePlanner routePlanner;
public RedirectExec(
final ClientExecChain requestExecutor,
final HttpRoutePlanner routePlanner,
final RedirectStrategy redirectStrategy) {
super();
Args.notNull(requestExecutor, "HTTP client request executor");
Args.notNull(routePlanner, "HTTP route planner");
Args.notNull(redirectStrategy, "HTTP redirect strategy");
this.requestExecutor = requestExecutor;
this.routePlanner = routePlanner;
this.redirectStrategy = redirectStrategy;
}
@Override
public CloseableHttpResponse execute(
final HttpRoute route,
final HttpRequestWrapper request,
final HttpClientContext context,
final HttpExecutionAware execAware) throws IOException, HttpException {
Args.notNull(route, "HTTP route");
Args.notNull(request, "HTTP request");
Args.notNull(context, "HTTP context");
final List<URI> redirectLocations = context.getRedirectLocations();
if (redirectLocations != null) {
redirectLocations.clear();
}
final RequestConfig config = context.getRequestConfig();
final int maxRedirects = config.getMaxRedirects() > 0 ? config.getMaxRedirects() : 50;
HttpRoute currentRoute = route;
HttpRequestWrapper currentRequest = request;
for (int redirectCount = 0;;) {
final CloseableHttpResponse response = requestExecutor.execute(
currentRoute, currentRequest, context, execAware);
try {
if (config.isRedirectsEnabled() &&
this.redirectStrategy.isRedirected(currentRequest.getOriginal(), response, context)) {
if (redirectCount >= maxRedirects) {
throw new RedirectException("Maximum redirects ("+ maxRedirects + ") exceeded");
}
redirectCount++;
final HttpRequest redirect = this.redirectStrategy.getRedirect(
currentRequest.getOriginal(), response, context);
if (!redirect.headerIterator().hasNext()) {
final HttpRequest original = request.getOriginal();
redirect.setHeaders(original.getAllHeaders());
}
currentRequest = HttpRequestWrapper.wrap(redirect);
if (currentRequest instanceof HttpEntityEnclosingRequest) {
RequestEntityProxy.enhance((HttpEntityEnclosingRequest) currentRequest);
}
final URI uri = currentRequest.getURI();
final HttpHost newTarget = URIUtils.extractHost(uri);
if (newTarget == null) {
throw new ProtocolException("Redirect URI does not specify a valid host name: " +
uri);
}
// Reset virtual host and auth states if redirecting to another host
if (!currentRoute.getTargetHost().equals(newTarget)) {
final AuthState targetAuthState = context.getTargetAuthState();
if (targetAuthState != null) {
this.log.debug("Resetting target auth state");
targetAuthState.reset();
}
final AuthState proxyAuthState = context.getProxyAuthState();
if (proxyAuthState != null && proxyAuthState.isConnectionBased()) {
this.log.debug("Resetting proxy auth state");
proxyAuthState.reset();
}
}
currentRoute = this.routePlanner.determineRoute(newTarget, currentRequest, context);
if (this.log.isDebugEnabled()) {
this.log.debug("Redirecting to '" + uri + "' via " + currentRoute);
}
EntityUtils.consume(response.getEntity());
response.close();
} else {
return response;
}
} catch (final RuntimeException ex) {
response.close();
throw ex;
} catch (final IOException ex) {
response.close();
throw ex;
} catch (final HttpException ex) {
// Protocol exception related to a direct.
// The underlying connection may still be salvaged.
try {
EntityUtils.consume(response.getEntity());
} catch (final IOException ioex) {
this.log.debug("I/O error while releasing connection", ioex);
} finally {
response.close();
}
throw ex;
}
}
}
}