/*
* 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.tomcat.util.http.fileupload;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import org.apache.tomcat.util.http.fileupload.impl.FileCountLimitExceededException;
import org.apache.tomcat.util.http.fileupload.impl.FileItemIteratorImpl;
import org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException;
import org.apache.tomcat.util.http.fileupload.impl.IOFileUploadException;
import org.apache.tomcat.util.http.fileupload.util.FileItemHeadersImpl;
import org.apache.tomcat.util.http.fileupload.util.Streams;
/**
* High level API for processing file uploads.
*
* <p>
* This class handles multiple files per single HTML widget, sent using
* {@code multipart/mixed} encoding type, as specified by
* <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>. Use {@link
* #parseRequest(RequestContext)} to acquire a list of {@link
* org.apache.tomcat.util.http.fileupload.FileItem}s associated with a given HTML
* widget.</p>
*
* <p>How the data for individual parts is stored is determined by the factory
* used to create them; a given part may be in memory, on disk, or somewhere
* else.</p>
*/
public abstract class FileUploadBase {
/**
* Line feed.
*/
private static final char LF = ' ';
/**
* Carriage return.
*/
private static final char CR = ' ';
/**
* HTTP content type header name.
*/
public static final String CONTENT_TYPE = "Content-type";
/**
* HTTP content disposition header name.
*/
public static final String CONTENT_DISPOSITION = "Content-disposition";
/**
* HTTP content length header name.
*/
public static final String CONTENT_LENGTH = "Content-length";
/**
* Content-disposition value for form data.
*/
public static final String FORM_DATA = "form-data";
/**
* Content-disposition value for file attachment.
*/
public static final String ATTACHMENT = "attachment";
/**
* Part of HTTP content type header.
*/
public static final String MULTIPART = "multipart/";
/**
* HTTP content type header for multipart forms.
*/
public static final String MULTIPART_FORM_DATA = "multipart/form-data";
/**
* HTTP content type header for multiple uploads.
*/
public static final String MULTIPART_MIXED = "multipart/mixed";
/**
* Default per part header size limit in bytes.
*
* @since FileUpload 1.6.0
*/
public static final int DEFAULT_PART_HEADER_SIZE_MAX = 512;
/**
* The maximum size permitted for the complete request, as opposed to
* {@link #fileSizeMax}. A value of -1 indicates no maximum.
*/
private long sizeMax = -1;
/**
* The maximum size permitted for a single uploaded file, as opposed
* to {@link #sizeMax}. A value of -1 indicates no maximum.
*/
private long fileSizeMax = -1;
/**
* The maximum permitted number of files that may be uploaded in a single
* request. A value of -1 indicates no maximum.
*/
private long fileCountMax = -1;
/**
* The maximum permitted size of the headers provided with a single part in bytes.
*/
private int partHeaderSizeMax = DEFAULT_PART_HEADER_SIZE_MAX;
/**
* The content encoding to use when reading part headers.
*/
private String headerEncoding;
/**
* The progress listener.
*/
private ProgressListener listener;
/**
* Constructs a new instance.
*/
public FileUploadBase() {
// empty
}
/**
* Gets the boundary from the {@code Content-type} header.
*
* @param contentType The value of the content type header from which to
* extract the boundary value.
*
* @return The boundary, as a byte array.
*/
public byte[] getBoundary(final String contentType) {
final ParameterParser parser = new ParameterParser();
parser.setLowerCaseNames(true);
// Parameter parser can handle null input
final Map<String, String> params = parser.parse(contentType, new char[] {';', ','});
final String boundaryStr = params.get("boundary");
if (boundaryStr == null) {
return null;
}
return boundaryStr.getBytes(StandardCharsets.ISO_8859_1);
}
/**
* Gets the field name from the {@code Content-disposition}
* header.
*
* @param headers A {@code Map} containing the HTTP request headers.
*
* @return The field name for the current {@code encapsulation}.
*/
public String getFieldName(final FileItemHeaders headers) {
return getFieldName(headers.getHeader(CONTENT_DISPOSITION));
}
/**
* Returns the field name, which is given by the content-disposition
* header.
* @param contentDisposition The content-dispositions header value.
* @return The field name.
*/
private String getFieldName(final String contentDisposition) {
String fieldName = null;
if (contentDisposition != null && contentDisposition.toLowerCase(Locale.ROOT).startsWith(FORM_DATA)) {
final ParameterParser parser = new ParameterParser();
parser.setLowerCaseNames(true);
// Parameter parser can handle null input
final Map<String, String> params = parser.parse(contentDisposition, ';');
fieldName = params.get("name");
if (fieldName != null) {
fieldName = fieldName.trim();
}
}
return fieldName;
}
/**
* Returns the maximum number of files allowed in a single request.
*
* @return The maximum number of files allowed in a single request.
*/
public long getFileCountMax() {
return fileCountMax;
}
/**
* Returns the factory class used when creating file items.
*
* @return The factory class for new file items.
*/
public abstract FileItemFactory getFileItemFactory();
/**
* Gets the file name from the {@code Content-disposition}
* header.
*
* @param headers The HTTP headers object.
*
* @return The file name for the current {@code encapsulation}.
*/
public String getFileName(final FileItemHeaders headers) {
return getFileName(headers.getHeader(CONTENT_DISPOSITION));
}
/**
* Returns the given content-disposition headers file name.
* @param contentDisposition The content-disposition headers value.
* @return The file name
*/
private String getFileName(final String contentDisposition) {
String fileName = null;
if (contentDisposition != null) {
final String cdl = contentDisposition.toLowerCase(Locale.ROOT);
if (cdl.startsWith(FORM_DATA) || cdl.startsWith(ATTACHMENT)) {
final ParameterParser parser = new ParameterParser();
parser.setLowerCaseNames(true);
// Parameter parser can handle null input
final Map<String, String> params = parser.parse(contentDisposition, ';');
if (params.containsKey("filename")) {
fileName = params.get("filename");
if (fileName != null) {
fileName = fileName.trim();
} else {
// Even if there is no value, the parameter is present,
// so we return an empty file name rather than no file
// name.
fileName = "";
}
}
}
}
return fileName;
}
/**
* Returns the maximum allowed size of a single uploaded file,
* as opposed to {@link #getSizeMax()}.
*
* @see #setFileSizeMax(long)
* @return Maximum size of a single uploaded file.
*/
public long getFileSizeMax() {
return fileSizeMax;
}
/**
* Gets the character encoding used when reading the headers of an
* individual part. When not specified, or {@code null}, the request
* encoding is used. If that is also not specified, or {@code null},
* the platform default encoding is used.
*
* @return The encoding used to read part headers.
*/
public String getHeaderEncoding() {
return headerEncoding;
}
/**
* Processes an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>
* compliant {@code multipart/form-data} stream.
*
* @param ctx The context for the request to be parsed.
*
* @return An iterator to instances of {@code FileItemStream}
* parsed from the request, in the order that they were
* transmitted.
*
* @throws FileUploadException if there are problems reading/parsing
* the request or storing files.
* @throws IOException An I/O error occurred. This may be a network
* error while communicating with the client or a problem while
* storing the uploaded content.
*/
public FileItemIterator getItemIterator(final RequestContext ctx)
throws FileUploadException, IOException {
try {
return new FileItemIteratorImpl(this, ctx);
} catch (final FileUploadIOException e) {
// unwrap encapsulated SizeException
throw (FileUploadException) e.getCause();
}
}
/**
* <p> Parses the {@code header-part} and returns as key/value
* pairs.
*
* <p> If there are multiple headers of the same names, the name
* will map to a comma-separated list containing the values.
*
* @param headerPart The {@code header-part} of the current
* {@code encapsulation}.
*
* @return A {@code Map} containing the parsed HTTP request headers.
*/
public FileItemHeaders getParsedHeaders(final String headerPart) {
final int len = headerPart.length();
final FileItemHeadersImpl headers = newFileItemHeaders();
int start = 0;
for (;;) {
int end = parseEndOfLine(headerPart, start);
if (start == end) {
break;
}
final StringBuilder header = new StringBuilder(headerPart.substring(start, end));
start = end + 2;
while (start < len) {
int nonWs = start;
while (nonWs < len) {
final char c = headerPart.charAt(nonWs);
if (c != ' ' && c != ' ') {
break;
}
++nonWs;
}
if (nonWs == start) {
break;
}
// Continuation line found
end = parseEndOfLine(headerPart, nonWs);
header.append(' ').append(headerPart, nonWs, end);
start = end + 2;
}
parseHeaderLine(headers, header.toString());
}
return headers;
}
/**
* Obtain the per part size limit for headers.
*
* @return The maximum size of the headers for a single part in bytes.
*
* @since FileUpload 1.6.0
*/
public int getPartHeaderSizeMax() {
return partHeaderSizeMax;
}
/**
* Returns the progress listener.
*
* @return The progress listener, if any, or null.
*/
public ProgressListener getProgressListener() {
return listener;
}
/**
* Returns the maximum allowed size of a complete request, as opposed
* to {@link #getFileSizeMax()}.
*
* @return The maximum allowed size, in bytes. The default value of
* -1 indicates, that there is no limit.
*
* @see #setSizeMax(long)
*
*/
public long getSizeMax() {
return sizeMax;
}
/**
* Creates a new instance of {@link FileItemHeaders}.
* @return The new instance.
*/
protected FileItemHeadersImpl newFileItemHeaders() {
return new FileItemHeadersImpl();
}
/**
* Skips bytes until the end of the current line.
* @param headerPart The headers, which are being parsed.
* @param end Index of the last byte, which has yet been
* processed.
* @return Index of the sequence, which indicates
* end of line.
*/
private int parseEndOfLine(final String headerPart, final int end) {
int index = end;
for (;;) {
final int offset = headerPart.indexOf(CR, index);
if (offset == -1 || offset + 1 >= headerPart.length()) {
throw new IllegalStateException(
"Expected headers to be terminated by an empty line.");
}
if (headerPart.charAt(offset + 1) == LF) {
return offset;
}
index = offset + 1;
}
}
/**
* Reads the next header line.
* @param headers String with all headers.
* @param header Map where to store the current header.
*/
private void parseHeaderLine(final FileItemHeadersImpl headers, final String header) {
final int colonOffset = header.indexOf(':');
if (colonOffset == -1) {
// This header line is malformed, skip it.
return;
}
final String headerName = header.substring(0, colonOffset).trim();
final String headerValue = header.substring(colonOffset + 1).trim();
headers.addHeader(headerName, headerValue);
}
/**
* Processes an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>
* compliant {@code multipart/form-data} stream.
*
* @param ctx The context for the request to be parsed.
*
* @return A list of {@code FileItem} instances parsed from the
* request, in the order that they were transmitted.
*
* @throws FileUploadException if there are problems reading/parsing
* the request or storing files.
*/
public List<FileItem> parseRequest(final RequestContext ctx) throws FileUploadException {
final List<FileItem> items = new ArrayList<>();
boolean successful = false;
try {
final FileItemIterator iter = getItemIterator(ctx);
final FileItemFactory fileItemFactory = getFileItemFactory();
Objects.requireNonNull(fileItemFactory, "getFileItemFactory()");
final byte[] buffer = new byte[Streams.DEFAULT_BUFFER_SIZE];
while (iter.hasNext()) {
if (items.size() == fileCountMax) {
// The next item will exceed the limit.
throw new FileCountLimitExceededException(ATTACHMENT, getFileCountMax());
}
final FileItemStream item = iter.next();
// Don't use getName() here to prevent an InvalidFileNameException.
final String fileName = item.getName();
final FileItem fileItem = fileItemFactory.createItem(item.getFieldName(), item.getContentType(),
item.isFormField(), fileName);
items.add(fileItem);
try {
Streams.copy(item.openStream(), fileItem.getOutputStream(), true, buffer);
} catch (final FileUploadIOException e) {
throw (FileUploadException) e.getCause();
} catch (final IOException e) {
throw new IOFileUploadException(String.format("Processing of %s request failed. %s",
MULTIPART_FORM_DATA, e.getMessage()), e);
}
final FileItemHeaders fih = item.getHeaders();
fileItem.setHeaders(fih);
}
successful = true;
return items;
} catch (final FileUploadException e) {
throw e;
} catch (final IOException e) {
throw new FileUploadException(e.getMessage(), e);
} finally {
if (!successful) {
for (final FileItem fileItem : items) {
try {
fileItem.delete();
} catch (final Exception ignored) {
// ignored TODO perhaps add to tracker delete failure list somehow?
}
}
}
}
}
/**
* Sets the maximum number of files allowed per request.
*
* @param fileCountMax The new limit. {@code -1} means no limit.
*/
public void setFileCountMax(final long fileCountMax) {
this.fileCountMax = fileCountMax;
}
/**
* Sets the factory class to use when creating file items.
*
* @param factory The factory class for new file items.
*/
public abstract void setFileItemFactory(FileItemFactory factory);
/**
* Sets the maximum allowed size of a single uploaded file,
* as opposed to {@link #getSizeMax()}.
*
* @see #getFileSizeMax()
* @param fileSizeMax Maximum size of a single uploaded file.
*/
public void setFileSizeMax(final long fileSizeMax) {
this.fileSizeMax = fileSizeMax;
}
/**
* Specifies the character encoding to be used when reading the headers of
* individual part. When not specified, or {@code null}, the request
* encoding is used. If that is also not specified, or {@code null},
* the platform default encoding is used.
*
* @param encoding The encoding used to read part headers.
*/
public void setHeaderEncoding(final String encoding) {
headerEncoding = encoding;
}
/**
* Sets the per part size limit for headers.
*
* @param partHeaderSizeMax The maximum size of the headers in bytes.
*
* @since FileUpload 1.6.0
*/
public void setPartHeaderSizeMax(final int partHeaderSizeMax) {
this.partHeaderSizeMax = partHeaderSizeMax;
}
/**
* Sets the progress listener.
*
* @param listener The progress listener, if any. Defaults to null.
*/
public void setProgressListener(final ProgressListener listener) {
this.listener = listener;
}
/**
* Sets the maximum allowed size of a complete request, as opposed
* to {@link #setFileSizeMax(long)}.
*
* @param sizeMax The maximum allowed size, in bytes. The default value of
* -1 indicates, that there is no limit.
*
* @see #getSizeMax()
*
*/
public void setSizeMax(final long sizeMax) {
this.sizeMax = sizeMax;
}
}