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/**
* 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.
*/
package org.apache.cxf.jaxrs.impl;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import javax.ws.rs.core.EntityTag;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;
import javax.ws.rs.core.Variant;
import org.apache.cxf.jaxrs.utils.HttpUtils;
import org.apache.cxf.jaxrs.utils.JAXRSUtils;
import org.apache.cxf.message.Message;
/**
* TODO : deal with InvalidStateExceptions
*
*/
public class RequestImpl implements Request {
private final Message m;
private final HttpHeaders headers;
public RequestImpl(Message m) {
this.m = m;
this.headers = new HttpHeadersImpl(m);
}
public Variant selectVariant(List vars) throws IllegalArgumentException {
if (vars == null || vars.isEmpty()) {
throw new IllegalArgumentException("List of Variants is either null or empty");
}
MediaType inMediaType = headers.getMediaType();
Locale inLang = headers.getLanguage();
String inEnc = headers.getRequestHeaders().getFirst(HttpHeaders.CONTENT_ENCODING);
List matchingVars = new LinkedList();
for (Variant var : vars) {
MediaType mt = var.getMediaType();
Locale lang = var.getLanguage();
String enc = var.getEncoding();
boolean mtMatched = mt == null || inMediaType == null
|| JAXRSUtils.intersectMimeTypes(Collections.singletonList(inMediaType), mt).size() != 0;
boolean encMatched = inEnc == null || enc == null || inEnc.equalsIgnoreCase(enc);
boolean langMatched = inLang == null || lang == null || inLang.equals(lang);
if (mtMatched && encMatched && langMatched) {
matchingVars.add(var);
}
}
if (matchingVars.size() > 1) {
Collections.sort(matchingVars, new VariantComparator());
}
return matchingVars.isEmpty() ? null : matchingVars.get(0);
}
public ResponseBuilder evaluatePreconditions(EntityTag eTag) {
ResponseBuilder rb = evaluateIfMatch(eTag);
if (rb == null) {
rb = evaluateIfNonMatch(eTag);
}
return rb;
}
private ResponseBuilder evaluateIfMatch(EntityTag eTag) {
List ifMatch = headers.getRequestHeader(HttpHeaders.IF_MATCH);
if (ifMatch == null || ifMatch.size() == 0) {
return null;
}
try {
for (String value : ifMatch) {
if ("*".equals(value)) {
return null;
}
EntityTag requestTag = EntityTag.valueOf(value);
// must be a strong comparison
if (!requestTag.isWeak() && !eTag.isWeak() && requestTag.equals(eTag)) {
return null;
}
}
} catch (IllegalArgumentException ex) {
// ignore
}
return Response.status(Response.Status.PRECONDITION_FAILED).tag(eTag);
}
private ResponseBuilder evaluateIfNonMatch(EntityTag eTag) {
List ifNonMatch = headers.getRequestHeader(HttpHeaders.IF_NONE_MATCH);
if (ifNonMatch == null || ifNonMatch.size() == 0) {
return null;
}
String method = getMethod();
boolean getOrHead = "GET".equals(method) || "HEAD".equals(method);
try {
for (String value : ifNonMatch) {
boolean result = "*".equals(value);
if (!result) {
EntityTag requestTag = EntityTag.valueOf(value);
result = getOrHead ? requestTag.equals(eTag)
: !requestTag.isWeak() && !eTag.isWeak() && requestTag.equals(eTag);
}
if (result) {
Response.Status status = getOrHead ? Response.Status.NOT_MODIFIED
: Response.Status.PRECONDITION_FAILED;
return Response.status(status).tag(eTag);
}
}
} catch (IllegalArgumentException ex) {
// ignore
}
return null;
}
public ResponseBuilder evaluatePreconditions(Date lastModified) {
List ifModifiedSince = headers.getRequestHeader(HttpHeaders.IF_MODIFIED_SINCE);
if (ifModifiedSince == null || ifModifiedSince.size() == 0) {
return evaluateIfNotModifiedSince(lastModified);
}
SimpleDateFormat dateFormat = HttpUtils.getHttpDateFormat();
dateFormat.setLenient(false);
Date dateSince = null;
try {
dateSince = dateFormat.parse(ifModifiedSince.get(0));
} catch (ParseException ex) {
// invalid header value, request should continue
return Response.status(Response.Status.PRECONDITION_FAILED);
}
if (dateSince.before(lastModified)) {
// request should continue
return null;
}
return Response.status(Response.Status.NOT_MODIFIED);
}
public ResponseBuilder evaluateIfNotModifiedSince(Date lastModified) {
List ifNotModifiedSince = headers.getRequestHeader(HttpHeaders.IF_UNMODIFIED_SINCE);
if (ifNotModifiedSince == null || ifNotModifiedSince.size() == 0) {
return null;
}
SimpleDateFormat dateFormat = HttpUtils.getHttpDateFormat();
dateFormat.setLenient(false);
Date dateSince = null;
try {
dateSince = dateFormat.parse(ifNotModifiedSince.get(0));
} catch (ParseException ex) {
// invalid header value, request should continue
return Response.status(Response.Status.PRECONDITION_FAILED);
}
if (dateSince.before(lastModified)) {
return Response.status(Response.Status.PRECONDITION_FAILED);
}
return null;
}
public ResponseBuilder evaluatePreconditions(Date lastModified, EntityTag eTag) {
final ResponseBuilder rb = evaluatePreconditions(eTag);
if (rb != null) {
// the ETag conditions match; so now conditions for last modified must match
return evaluatePreconditions(lastModified);
} else {
// the ETag conditions do not match, so last modified should be ignored
// see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html (section 14.26 for
// "If-None-Match", behavior not specified for "If-Match", section 14.24)
return null;
}
}
public String getMethod() {
return m.get(Message.HTTP_REQUEST_METHOD).toString();
}
public ResponseBuilder evaluatePreconditions() {
List ifMatch = headers.getRequestHeader(HttpHeaders.IF_MATCH);
if (ifMatch != null) {
for (String value : ifMatch) {
if (!"*".equals(value)) {
return Response.status(Response.Status.PRECONDITION_FAILED).tag(EntityTag.valueOf(value));
}
}
}
return null;
}
private static class VariantComparator implements Comparator {
public int compare(Variant v1, Variant v2) {
int result = compareMediaTypes(v1.getMediaType(), v2.getMediaType());
if (result != 0) {
return result;
}
result = compareLanguages(v1.getLanguage(), v2.getLanguage());
if (result == 0) {
result = compareEncodings(v1.getEncoding(), v2.getEncoding());
}
return result;
}
private static int compareMediaTypes(MediaType mt1, MediaType mt2) {
if (mt1 != null && mt2 == null) {
return -1;
} else if (mt1 == null && mt2 != null) {
return 1;
}
return JAXRSUtils.compareMediaTypes(mt1, mt2);
}
private static int compareLanguages(Locale l1, Locale l2) {
if (l1 != null && l2 == null) {
return -1;
} else if (l1 == null && l2 != null) {
return 1;
}
return 0;
}
private static int compareEncodings(String enc1, String enc2) {
if (enc1 != null && enc2 == null) {
return -1;
} else if (enc1 == null && enc2 != null) {
return 1;
}
return 0;
}
}
}