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/*-
* ============LICENSE_START=======================================================
* 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.
* ============LICENSE_END=========================================================
*/
package com.woorea.openstack.connector;
import java.net.URI;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.ProtocolException;
import org.apache.http.annotation.Immutable;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.methods.RequestBuilder;
import org.apache.http.impl.client.DefaultRedirectStrategy;
import org.apache.http.protocol.HttpContext;
/**
* Custom {@link org.apache.http.client.RedirectStrategy} implementation
* that automatically redirects all HEAD, GET and DELETE requests.
* The {@link org.apache.http.client.DefaultRedirectStrategy} only
* redirects GET and HEAD automatically, per the HTTP specification
* (POST and PUT typically have bodies and thus cannot be redirected).
*
* A custom strategy is needed for the Openstack API, which can also send
* 302 on a DELETE (by name) request, expecting the client to follow the
* redirect to perform the actual deletion.
*/
@Immutable
public class HttpClientRedirectStrategy extends DefaultRedirectStrategy {
/**
* Redirectable methods.
*/
private static final String[] REDIRECT_METHODS = new String[] {
HttpGet.METHOD_NAME,
HttpDelete.METHOD_NAME,
HttpHead.METHOD_NAME
};
/**
* Determine if the request should be redirected.
* This may not actually be needed, since the REDIRECT_METHODS
* array has been updated with the DELETE.
*/
@Override
protected boolean isRedirectable(final String method) {
for (final String m: REDIRECT_METHODS) {
if (m.equalsIgnoreCase(method)) {
return true;
}
}
return false;
}
/**
* Override the default redirect handling method. As implemented
* in HttpClient, it does not preserve the method on 301 or 302
* responses, always redirecting to a GET.
*/
@Override
public HttpUriRequest getRedirect(
final HttpRequest request,
final HttpResponse response,
final HttpContext context) throws ProtocolException {
final URI uri = getLocationURI(request, response, context);
final String method = request.getRequestLine().getMethod();
if (method.equalsIgnoreCase(HttpHead.METHOD_NAME)) {
return new HttpHead(uri);
} else if (method.equalsIgnoreCase(HttpGet.METHOD_NAME)) {
return new HttpGet(uri);
} else {
final int status = response.getStatusLine().getStatusCode();
HttpUriRequest newRequest;
if (status == HttpStatus.SC_TEMPORARY_REDIRECT || status == HttpStatus.SC_MOVED_TEMPORARILY) {
newRequest = RequestBuilder.copy(request).setUri(uri).build();
} else {
newRequest = new HttpGet(uri);
}
return newRequest;
}
}
}
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