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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license
/*
* 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 io.milton.http.http11;
import io.milton.common.ContentTypeUtils;
import io.milton.common.LogUtils;
import io.milton.common.Path;
import io.milton.http.HttpManager;
import io.milton.http.Range;
import io.milton.http.Request;
import io.milton.http.exceptions.BadRequestException;
import io.milton.http.exceptions.ConflictException;
import io.milton.http.exceptions.NotAuthorizedException;
import io.milton.http.exceptions.NotFoundException;
import io.milton.resource.CollectionResource;
import io.milton.resource.GetableResource;
import io.milton.resource.Resource;
import java.io.IOException;
import java.io.OutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A collection of utility methods for PutHandler
*
*/
public class PutHelper {
private static final Logger log = LoggerFactory.getLogger( PutHelper.class );
/**
* Largly copied from tomcat
*
* See the spec
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*
* @param r
* @param request
* @return
* @throws IOException
* @throws BadRequestException - if the range header is invalid
*/
public Range parseContentRange(Resource r, Request request) throws IOException, BadRequestException {
// Retrieving the content-range header (if any is specified
String rangeHeader = request.getContentRangeHeader();
if (rangeHeader == null) {
return null;
}
// bytes is the only range unit supported
if (!rangeHeader.startsWith("bytes")) {
log.warn("Invalid range header, does not start with 'bytes': " + rangeHeader);
throw new BadRequestException(r);
}
rangeHeader = rangeHeader.substring(6).trim();
int dashPos = rangeHeader.indexOf('-');
int slashPos = rangeHeader.indexOf('/');
if (dashPos == -1) {
log.warn("Invalid range header, dash not found: " + rangeHeader);
throw new BadRequestException(r);
}
if (slashPos == -1) {
log.warn("Invalid range header, slash not found: " + rangeHeader);
throw new BadRequestException(r);
}
String s;
long start;
s = rangeHeader.substring(0, dashPos);
try {
start = Long.parseLong(s);
} catch (NumberFormatException e) {
log.warn("Invalid range header, start is not a valid number: " + s + " Raw header:" + rangeHeader);
throw new BadRequestException(r);
}
long finish;
s = rangeHeader.substring(dashPos + 1, slashPos);
try {
finish = Long.parseLong(s);
} catch (NumberFormatException e) {
log.warn("Invalid range header, finish is not a valid number: " + s + " Raw header:" + rangeHeader);
throw new BadRequestException(r);
}
Range range = new Range(start, finish);
if (!validate(range)) {
throw new BadRequestException(r);
}
return range;
}
private boolean validate(Range r) {
if( r.getStart() < 0 ) {
log.warn("invalid range, start is negative");
return false;
} else if( r.getFinish() < 0 ) {
log.warn("invalid range, finish is negative");
return false;
} else if( r.getStart() > r.getFinish()) {
log.warn("invalid range, start is greater then finish");
return false;
} else {
return true;
}
}
public Long getContentLength( Request request ) throws BadRequestException {
Long l = request.getContentLengthHeader();
if( l == null ) {
String s = request.getRequestHeader( Request.Header.X_EXPECTED_ENTITY_LENGTH );
if( s != null && s.length() > 0 ) {
log.debug( "no content-length given, but founhd non-standard length header: " + s );
try {
l = Long.parseLong( s );
} catch( NumberFormatException e ) {
throw new BadRequestException( null, "invalid length for header: " + Request.Header.X_EXPECTED_ENTITY_LENGTH.code + ". value is: " + s );
}
}
}
return l;
}
/**
* returns a textual representation of the list of content types for the
* new resource. This will be the content type header if there is one,
* otherwise it will be determined by the file name
*
* @param request
* @param newName
* @return
*/
public String findContentTypes( Request request, String newName ) {
// String ct = request.getContentTypeHeader();
// if( ct != null ) {
// LogUtils.trace(log, "findContentTypes: got header: " + ct);
// return ct;
// }
String s = ContentTypeUtils.findContentTypes( newName );
LogUtils.trace(log, "findContentTypes: got type from name. Type: " + s);
return s;
}
public CollectionResource findNearestParent( HttpManager manager, String host, Path path ) throws NotAuthorizedException, ConflictException, BadRequestException {
if( path == null ) {
return null;
}
Resource thisResource = manager.getResourceFactory().getResource( host, path.toString() );
if( thisResource != null ) {
if( thisResource instanceof CollectionResource ) {
return (CollectionResource) thisResource;
} else {
log.warn( "parent is not a collection: " + path );
return null;
}
}
return findNearestParent( manager, host, path.getParent() );
}
/**
* Copy the current content of the resource to the outputstream, except
* writing the new partial update for the given range.
*
*
* @param replacee - the resource to get the content for and to update
* @param request
* @param range
* @param tempOut
*/
public void applyPartialUpdate(GetableResource replacee, Request request, Range range, OutputStream tempOut) throws NotAuthorizedException, BadRequestException, NotFoundException {
try {
replacee.sendContent(tempOut, null, null, null);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
}