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HttpComponents HttpClient - Cache
/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* 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
* disallowedWithNoCache =
Arrays.asList(HeaderConstants.CACHE_CONTROL_MIN_FRESH, HeaderConstants.CACHE_CONTROL_MAX_STALE, HeaderConstants.CACHE_CONTROL_MAX_AGE);
/**
* Test to see if the {@link HttpRequest} is HTTP1.1 compliant or not
* and if not, we can not continue.
*
* @param request the HttpRequest Object
* @return list of {@link RequestProtocolError}
*/
public List requestIsFatallyNonCompliant(HttpRequest request) {
List theErrors = new ArrayList();
RequestProtocolError anError = requestHasWeakETagAndRange(request);
if (anError != null) {
theErrors.add(anError);
}
anError = requestHasWeekETagForPUTOrDELETEIfMatch(request);
if (anError != null) {
theErrors.add(anError);
}
anError = requestContainsNoCacheDirectiveWithFieldName(request);
if (anError != null) {
theErrors.add(anError);
}
return theErrors;
}
/**
* If the {@link HttpRequest} is non-compliant but 'fixable' we go ahead and
* fix the request here. Returning the updated one.
*
* @param request the request to check for compliance
* @return the updated request
* @throws ClientProtocolException when we have trouble making the request compliant
*/
public HttpRequest makeRequestCompliant(HttpRequest request)
throws ClientProtocolException {
if (requestMustNotHaveEntity(request)) {
((HttpEntityEnclosingRequest) request).setEntity(null);
}
verifyRequestWithExpectContinueFlagHas100continueHeader(request);
verifyOPTIONSRequestWithBodyHasContentType(request);
decrementOPTIONSMaxForwardsIfGreaterThen0(request);
stripOtherFreshnessDirectivesWithNoCache(request);
if (requestVersionIsTooLow(request)) {
return upgradeRequestTo(request, HttpVersion.HTTP_1_1);
}
if (requestMinorVersionIsTooHighMajorVersionsMatch(request)) {
return downgradeRequestTo(request, HttpVersion.HTTP_1_1);
}
return request;
}
private void stripOtherFreshnessDirectivesWithNoCache(HttpRequest request) {
List outElts = new ArrayList();
boolean shouldStrip = false;
for(Header h : request.getHeaders(HeaderConstants.CACHE_CONTROL)) {
for(HeaderElement elt : h.getElements()) {
if (!disallowedWithNoCache.contains(elt.getName())) {
outElts.add(elt);
}
if (HeaderConstants.CACHE_CONTROL_NO_CACHE.equals(elt.getName())) {
shouldStrip = true;
}
}
}
if (!shouldStrip) return;
request.removeHeaders(HeaderConstants.CACHE_CONTROL);
request.setHeader(HeaderConstants.CACHE_CONTROL, buildHeaderFromElements(outElts));
}
private String buildHeaderFromElements(List outElts) {
StringBuilder newHdr = new StringBuilder("");
boolean first = true;
for(HeaderElement elt : outElts) {
if (!first) {
newHdr.append(",");
} else {
first = false;
}
newHdr.append(elt.toString());
}
return newHdr.toString();
}
private boolean requestMustNotHaveEntity(HttpRequest request) {
return HeaderConstants.TRACE_METHOD.equals(request.getRequestLine().getMethod())
&& request instanceof HttpEntityEnclosingRequest;
}
private void decrementOPTIONSMaxForwardsIfGreaterThen0(HttpRequest request) {
if (!HeaderConstants.OPTIONS_METHOD.equals(request.getRequestLine().getMethod())) {
return;
}
Header maxForwards = request.getFirstHeader(HeaderConstants.MAX_FORWARDS);
if (maxForwards == null) {
return;
}
request.removeHeaders(HeaderConstants.MAX_FORWARDS);
int currentMaxForwards = Integer.parseInt(maxForwards.getValue());
request.setHeader(HeaderConstants.MAX_FORWARDS, Integer.toString(currentMaxForwards - 1));
}
private void verifyOPTIONSRequestWithBodyHasContentType(HttpRequest request) {
if (!HeaderConstants.OPTIONS_METHOD.equals(request.getRequestLine().getMethod())) {
return;
}
if (!(request instanceof HttpEntityEnclosingRequest)) {
return;
}
addContentTypeHeaderIfMissing((HttpEntityEnclosingRequest) request);
}
private void addContentTypeHeaderIfMissing(HttpEntityEnclosingRequest request) {
if (request.getEntity().getContentType() == null) {
((AbstractHttpEntity) request.getEntity()).setContentType(
ContentType.APPLICATION_OCTET_STREAM.getMimeType());
}
}
private void verifyRequestWithExpectContinueFlagHas100continueHeader(HttpRequest request) {
if (request instanceof HttpEntityEnclosingRequest) {
if (((HttpEntityEnclosingRequest) request).expectContinue()
&& ((HttpEntityEnclosingRequest) request).getEntity() != null) {
add100ContinueHeaderIfMissing(request);
} else {
remove100ContinueHeaderIfExists(request);
}
} else {
remove100ContinueHeaderIfExists(request);
}
}
private void remove100ContinueHeaderIfExists(HttpRequest request) {
boolean hasHeader = false;
Header[] expectHeaders = request.getHeaders(HTTP.EXPECT_DIRECTIVE);
List expectElementsThatAreNot100Continue = new ArrayList();
for (Header h : expectHeaders) {
for (HeaderElement elt : h.getElements()) {
if (!(HTTP.EXPECT_CONTINUE.equalsIgnoreCase(elt.getName()))) {
expectElementsThatAreNot100Continue.add(elt);
} else {
hasHeader = true;
}
}
if (hasHeader) {
request.removeHeader(h);
for (HeaderElement elt : expectElementsThatAreNot100Continue) {
BasicHeader newHeader = new BasicHeader(HTTP.EXPECT_DIRECTIVE, elt.getName());
request.addHeader(newHeader);
}
return;
} else {
expectElementsThatAreNot100Continue = new ArrayList();
}
}
}
private void add100ContinueHeaderIfMissing(HttpRequest request) {
boolean hasHeader = false;
for (Header h : request.getHeaders(HTTP.EXPECT_DIRECTIVE)) {
for (HeaderElement elt : h.getElements()) {
if (HTTP.EXPECT_CONTINUE.equalsIgnoreCase(elt.getName())) {
hasHeader = true;
}
}
}
if (!hasHeader) {
request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
}
}
private HttpRequest upgradeRequestTo(HttpRequest request, ProtocolVersion version)
throws ClientProtocolException {
RequestWrapper newRequest;
try {
newRequest = new RequestWrapper(request);
} catch (ProtocolException pe) {
throw new ClientProtocolException(pe);
}
newRequest.setProtocolVersion(version);
return newRequest;
}
private HttpRequest downgradeRequestTo(HttpRequest request, ProtocolVersion version)
throws ClientProtocolException {
RequestWrapper newRequest;
try {
newRequest = new RequestWrapper(request);
} catch (ProtocolException pe) {
throw new ClientProtocolException(pe);
}
newRequest.setProtocolVersion(version);
return newRequest;
}
protected boolean requestMinorVersionIsTooHighMajorVersionsMatch(HttpRequest request) {
ProtocolVersion requestProtocol = request.getProtocolVersion();
if (requestProtocol.getMajor() != HttpVersion.HTTP_1_1.getMajor()) {
return false;
}
if (requestProtocol.getMinor() > HttpVersion.HTTP_1_1.getMinor()) {
return true;
}
return false;
}
protected boolean requestVersionIsTooLow(HttpRequest request) {
return request.getProtocolVersion().compareToVersion(HttpVersion.HTTP_1_1) < 0;
}
/**
* Extract error information about the {@link HttpRequest} telling the 'caller'
* that a problem occured.
*
* @param errorCheck What type of error should I get
* @return The {@link HttpResponse} that is the error generated
*/
public HttpResponse getErrorForRequest(RequestProtocolError errorCheck) {
switch (errorCheck) {
case BODY_BUT_NO_LENGTH_ERROR:
return new BasicHttpResponse(new BasicStatusLine(HttpVersion.HTTP_1_1,
HttpStatus.SC_LENGTH_REQUIRED, ""));
case WEAK_ETAG_AND_RANGE_ERROR:
return new BasicHttpResponse(new BasicStatusLine(HttpVersion.HTTP_1_1,
HttpStatus.SC_BAD_REQUEST, "Weak eTag not compatible with byte range"));
case WEAK_ETAG_ON_PUTDELETE_METHOD_ERROR:
return new BasicHttpResponse(new BasicStatusLine(HttpVersion.HTTP_1_1,
HttpStatus.SC_BAD_REQUEST,
"Weak eTag not compatible with PUT or DELETE requests"));
case NO_CACHE_DIRECTIVE_WITH_FIELD_NAME:
return new BasicHttpResponse(new BasicStatusLine(HttpVersion.HTTP_1_1,
HttpStatus.SC_BAD_REQUEST,
"No-Cache directive MUST NOT include a field name"));
default:
throw new IllegalStateException(
"The request was compliant, therefore no error can be generated for it.");
}
}
private RequestProtocolError requestHasWeakETagAndRange(HttpRequest request) {
// TODO: Should these be looking at all the headers marked as Range?
String method = request.getRequestLine().getMethod();
if (!(HeaderConstants.GET_METHOD.equals(method))) {
return null;
}
Header range = request.getFirstHeader(HeaderConstants.RANGE);
if (range == null)
return null;
Header ifRange = request.getFirstHeader(HeaderConstants.IF_RANGE);
if (ifRange == null)
return null;
String val = ifRange.getValue();
if (val.startsWith("W/")) {
return RequestProtocolError.WEAK_ETAG_AND_RANGE_ERROR;
}
return null;
}
private RequestProtocolError requestHasWeekETagForPUTOrDELETEIfMatch(HttpRequest request) {
// TODO: Should these be looking at all the headers marked as If-Match/If-None-Match?
String method = request.getRequestLine().getMethod();
if (!(HeaderConstants.PUT_METHOD.equals(method) || HeaderConstants.DELETE_METHOD
.equals(method))) {
return null;
}
Header ifMatch = request.getFirstHeader(HeaderConstants.IF_MATCH);
if (ifMatch != null) {
String val = ifMatch.getValue();
if (val.startsWith("W/")) {
return RequestProtocolError.WEAK_ETAG_ON_PUTDELETE_METHOD_ERROR;
}
} else {
Header ifNoneMatch = request.getFirstHeader(HeaderConstants.IF_NONE_MATCH);
if (ifNoneMatch == null)
return null;
String val2 = ifNoneMatch.getValue();
if (val2.startsWith("W/")) {
return RequestProtocolError.WEAK_ETAG_ON_PUTDELETE_METHOD_ERROR;
}
}
return null;
}
private RequestProtocolError requestContainsNoCacheDirectiveWithFieldName(HttpRequest request) {
for(Header h : request.getHeaders(HeaderConstants.CACHE_CONTROL)) {
for(HeaderElement elt : h.getElements()) {
if (HeaderConstants.CACHE_CONTROL_NO_CACHE.equalsIgnoreCase(elt.getName())
&& elt.getValue() != null) {
return RequestProtocolError.NO_CACHE_DIRECTIVE_WITH_FIELD_NAME;
}
}
}
return null;
}
}