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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.
* ====================================================================
*
* 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
* .
*
*/
package org.apache.hc.client5.http.protocol;
import java.io.IOException;
import java.time.Instant;
import org.apache.hc.client5.http.utils.DateUtils;
import org.apache.hc.client5.http.validator.ETag;
import org.apache.hc.client5.http.validator.ValidatorType;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpHeaders;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpRequestInterceptor;
import org.apache.hc.core5.http.ProtocolException;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.util.Args;
/**
*
* The {@code RequestIfRange} interceptor ensures that the request adheres to the RFC guidelines for the 'If-Range' header.
* The "If-Range" header field is used in conjunction with the Range header to conditionally request parts of a representation.
* If the validator given in the "If-Range" header matches the current validator for the representation, then the server should respond with the specified range of the document.
* If they do not match, the server should return the entire representation.
*
*
*
* Key points:
*
*
* - A client MUST NOT generate an If-Range header field in a request that does not contain a Range header field.
* - An origin server MUST ignore an If-Range header field received in a request for a target resource that does not support Range requests.
* - A client MUST NOT generate an If-Range header field containing an entity tag that is marked as weak.
* - A client MUST NOT generate an If-Range header field containing an HTTP-date unless the client has no entity tag for the corresponding representation and the date is a strong validator.
* - A server that receives an If-Range header field on a Range request MUST evaluate the condition before performing the method.
*
*
* @since 5.4
*/
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class RequestIfRange implements HttpRequestInterceptor {
/**
* Default instance of {@link RequestIfRange}.
*
* @since 5.4
*/
public static final RequestIfRange INSTANCE = new RequestIfRange();
public RequestIfRange() {
super();
}
/**
* Processes the given request to ensure it adheres to the RFC guidelines for the 'If-Range' header.
*
* @param request The HTTP request to be processed.
* @param entity The entity details of the request.
* @param context The HTTP context.
* @throws HttpException If the request does not adhere to the RFC guidelines.
* @throws IOException If an I/O error occurs.
*/
@Override
public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context)
throws HttpException, IOException {
Args.notNull(request, "HTTP request");
final Header ifRangeHeader = request.getFirstHeader(HttpHeaders.IF_RANGE);
// If there's no If-Range header, just return
if (ifRangeHeader == null) {
return;
}
// If there's an If-Range header but no Range header, throw an exception
if (!request.containsHeader(HttpHeaders.RANGE)) {
throw new ProtocolException("Request with 'If-Range' header must also contain a 'Range' header.");
}
final ETag eTag = ETag.get(request);
// If there's a weak ETag in the If-Range header, throw an exception
if (eTag != null && eTag.getType() == ValidatorType.WEAK) {
throw new ProtocolException("'If-Range' header must not contain a weak entity tag.");
}
final Instant dateInstant = DateUtils.parseStandardDate(request, HttpHeaders.DATE);
if (dateInstant == null) {
return;
}
final Instant lastModifiedInstant = DateUtils.parseStandardDate(request, HttpHeaders.LAST_MODIFIED);
if (lastModifiedInstant == null) {
// If there's no Last-Modified header, we exit early because we can't deduce that it is strong.
return;
}
// If the difference between the Last-Modified and Date headers is less than 1 second, throw an exception
if (lastModifiedInstant.plusSeconds(1).isAfter(dateInstant) && eTag != null) {
throw new ProtocolException("'If-Range' header with a Date must be a strong validator.");
}
}
}
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