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/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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:
*
* https://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.netty.handler.codec.http.multipart;
import io.netty.handler.codec.DecoderException;
import io.netty.handler.codec.http.HttpConstants;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.StringUtil;
import java.nio.charset.Charset;
import java.util.List;
/**
* This decoder will decode Body and can handle POST BODY.
*
* You MUST call {@link #destroy()} after completion to release all resources.
*
*/
public class HttpPostRequestDecoder implements InterfaceHttpPostRequestDecoder {
static final int DEFAULT_DISCARD_THRESHOLD = 10 * 1024 * 1024;
private final InterfaceHttpPostRequestDecoder decoder;
/**
*
* @param request
* the request to decode
* @throws NullPointerException
* for request
* @throws ErrorDataDecoderException
* if the default charset was wrong when decoding or other
* errors
*/
public HttpPostRequestDecoder(HttpRequest request) {
this(new DefaultHttpDataFactory(DefaultHttpDataFactory.MINSIZE), request, HttpConstants.DEFAULT_CHARSET);
}
/**
*
* @param factory
* the factory used to create InterfaceHttpData
* @param request
* the request to decode
* @throws NullPointerException
* for request or factory
* @throws ErrorDataDecoderException
* if the default charset was wrong when decoding or other
* errors
*/
public HttpPostRequestDecoder(HttpDataFactory factory, HttpRequest request) {
this(factory, request, HttpConstants.DEFAULT_CHARSET);
}
/**
*
* @param factory
* the factory used to create InterfaceHttpData
* @param request
* the request to decode
* @param charset
* the charset to use as default
* @throws NullPointerException
* for request or charset or factory
* @throws ErrorDataDecoderException
* if the default charset was wrong when decoding or other
* errors
*/
public HttpPostRequestDecoder(HttpDataFactory factory, HttpRequest request, Charset charset) {
ObjectUtil.checkNotNull(factory, "factory");
ObjectUtil.checkNotNull(request, "request");
ObjectUtil.checkNotNull(charset, "charset");
// Fill default values
if (isMultipart(request)) {
decoder = new HttpPostMultipartRequestDecoder(factory, request, charset);
} else {
decoder = new HttpPostStandardRequestDecoder(factory, request, charset);
}
}
/**
* states follow NOTSTARTED PREAMBLE ( (HEADERDELIMITER DISPOSITION (FIELD |
* FILEUPLOAD))* (HEADERDELIMITER DISPOSITION MIXEDPREAMBLE (MIXEDDELIMITER
* MIXEDDISPOSITION MIXEDFILEUPLOAD)+ MIXEDCLOSEDELIMITER)* CLOSEDELIMITER)+
* EPILOGUE
*
* First getStatus is: NOSTARTED
*
* Content-type: multipart/form-data, boundary=AaB03x => PREAMBLE in Header
*
* --AaB03x => HEADERDELIMITER content-disposition: form-data; name="field1"
* => DISPOSITION
*
* Joe Blow => FIELD --AaB03x => HEADERDELIMITER content-disposition:
* form-data; name="pics" => DISPOSITION Content-type: multipart/mixed,
* boundary=BbC04y
*
* --BbC04y => MIXEDDELIMITER Content-disposition: attachment;
* filename="file1.txt" => MIXEDDISPOSITION Content-Type: text/plain
*
* ... contents of file1.txt ... => MIXEDFILEUPLOAD --BbC04y =>
* MIXEDDELIMITER Content-disposition: file; filename="file2.gif" =>
* MIXEDDISPOSITION Content-type: image/gif Content-Transfer-Encoding:
* binary
*
* ...contents of file2.gif... => MIXEDFILEUPLOAD --BbC04y-- =>
* MIXEDCLOSEDELIMITER --AaB03x-- => CLOSEDELIMITER
*
* Once CLOSEDELIMITER is found, last getStatus is EPILOGUE
*/
protected enum MultiPartStatus {
NOTSTARTED, PREAMBLE, HEADERDELIMITER, DISPOSITION, FIELD, FILEUPLOAD, MIXEDPREAMBLE, MIXEDDELIMITER,
MIXEDDISPOSITION, MIXEDFILEUPLOAD, MIXEDCLOSEDELIMITER, CLOSEDELIMITER, PREEPILOGUE, EPILOGUE
}
/**
* Check if the given request is a multipart request
* @return True if the request is a Multipart request
*/
public static boolean isMultipart(HttpRequest request) {
String mimeType = request.headers().get(HttpHeaderNames.CONTENT_TYPE);
if (mimeType != null && mimeType.startsWith(HttpHeaderValues.MULTIPART_FORM_DATA.toString())) {
return getMultipartDataBoundary(mimeType) != null;
}
return false;
}
/**
* Check from the request ContentType if this request is a Multipart request.
* @return an array of String if multipartDataBoundary exists with the multipartDataBoundary
* as first element, charset if any as second (missing if not set), else null
*/
protected static String[] getMultipartDataBoundary(String contentType) {
// Check if Post using "multipart/form-data; boundary=--89421926422648 [; charset=xxx]"
String[] headerContentType = splitHeaderContentType(contentType);
final String multiPartHeader = HttpHeaderValues.MULTIPART_FORM_DATA.toString();
if (headerContentType[0].regionMatches(true, 0, multiPartHeader, 0 , multiPartHeader.length())) {
int mrank;
int crank;
final String boundaryHeader = HttpHeaderValues.BOUNDARY.toString();
if (headerContentType[1].regionMatches(true, 0, boundaryHeader, 0, boundaryHeader.length())) {
mrank = 1;
crank = 2;
} else if (headerContentType[2].regionMatches(true, 0, boundaryHeader, 0, boundaryHeader.length())) {
mrank = 2;
crank = 1;
} else {
return null;
}
String boundary = StringUtil.substringAfter(headerContentType[mrank], '=');
if (boundary == null) {
throw new ErrorDataDecoderException("Needs a boundary value");
}
if (boundary.charAt(0) == '"') {
String bound = boundary.trim();
int index = bound.length() - 1;
if (bound.charAt(index) == '"') {
boundary = bound.substring(1, index);
}
}
final String charsetHeader = HttpHeaderValues.CHARSET.toString();
if (headerContentType[crank].regionMatches(true, 0, charsetHeader, 0, charsetHeader.length())) {
String charset = StringUtil.substringAfter(headerContentType[crank], '=');
if (charset != null) {
return new String[] {"--" + boundary, charset};
}
}
return new String[] {"--" + boundary};
}
return null;
}
@Override
public boolean isMultipart() {
return decoder.isMultipart();
}
@Override
public void setDiscardThreshold(int discardThreshold) {
decoder.setDiscardThreshold(discardThreshold);
}
@Override
public int getDiscardThreshold() {
return decoder.getDiscardThreshold();
}
@Override
public List getBodyHttpDatas() {
return decoder.getBodyHttpDatas();
}
@Override
public List getBodyHttpDatas(String name) {
return decoder.getBodyHttpDatas(name);
}
@Override
public InterfaceHttpData getBodyHttpData(String name) {
return decoder.getBodyHttpData(name);
}
@Override
public InterfaceHttpPostRequestDecoder offer(HttpContent content) {
return decoder.offer(content);
}
@Override
public boolean hasNext() {
return decoder.hasNext();
}
@Override
public InterfaceHttpData next() {
return decoder.next();
}
@Override
public InterfaceHttpData currentPartialHttpData() {
return decoder.currentPartialHttpData();
}
@Override
public void destroy() {
decoder.destroy();
}
@Override
public void cleanFiles() {
decoder.cleanFiles();
}
@Override
public void removeHttpDataFromClean(InterfaceHttpData data) {
decoder.removeHttpDataFromClean(data);
}
/**
* Split the very first line (Content-Type value) in 3 Strings
*
* @return the array of 3 Strings
*/
private static String[] splitHeaderContentType(String sb) {
int aStart;
int aEnd;
int bStart;
int bEnd;
int cStart;
int cEnd;
aStart = HttpPostBodyUtil.findNonWhitespace(sb, 0);
aEnd = sb.indexOf(';');
if (aEnd == -1) {
return new String[] { sb, "", "" };
}
bStart = HttpPostBodyUtil.findNonWhitespace(sb, aEnd + 1);
if (sb.charAt(aEnd - 1) == ' ') {
aEnd--;
}
bEnd = sb.indexOf(';', bStart);
if (bEnd == -1) {
bEnd = HttpPostBodyUtil.findEndOfString(sb);
return new String[] { sb.substring(aStart, aEnd), sb.substring(bStart, bEnd), "" };
}
cStart = HttpPostBodyUtil.findNonWhitespace(sb, bEnd + 1);
if (sb.charAt(bEnd - 1) == ' ') {
bEnd--;
}
cEnd = HttpPostBodyUtil.findEndOfString(sb);
return new String[] { sb.substring(aStart, aEnd), sb.substring(bStart, bEnd), sb.substring(cStart, cEnd) };
}
/**
* Exception when try reading data from request in chunked format, and not
* enough data are available (need more chunks)
*/
public static class NotEnoughDataDecoderException extends DecoderException {
private static final long serialVersionUID = -7846841864603865638L;
public NotEnoughDataDecoderException() {
}
public NotEnoughDataDecoderException(String msg) {
super(msg);
}
public NotEnoughDataDecoderException(Throwable cause) {
super(cause);
}
public NotEnoughDataDecoderException(String msg, Throwable cause) {
super(msg, cause);
}
}
/**
* Exception when the body is fully decoded, even if there is still data
*/
public static class EndOfDataDecoderException extends DecoderException {
private static final long serialVersionUID = 1336267941020800769L;
}
/**
* Exception when an error occurs while decoding
*/
public static class ErrorDataDecoderException extends DecoderException {
private static final long serialVersionUID = 5020247425493164465L;
public ErrorDataDecoderException() {
}
public ErrorDataDecoderException(String msg) {
super(msg);
}
public ErrorDataDecoderException(Throwable cause) {
super(cause);
}
public ErrorDataDecoderException(String msg, Throwable cause) {
super(msg, cause);
}
}
}
