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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.http.entity.mime;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.util.ByteArrayBuffer;
/**
* HttpMultipart represents a collection of MIME multipart encoded content bodies. This class is
* capable of operating either in the strict (RFC 822, RFC 2045, RFC 2046 compliant) or
* the browser compatible modes.
*
* @since 4.0
*/
public class HttpMultipart {
private static ByteArrayBuffer encode(
final Charset charset, final String string) {
ByteBuffer encoded = charset.encode(CharBuffer.wrap(string));
ByteArrayBuffer bab = new ByteArrayBuffer(encoded.remaining());
bab.append(encoded.array(), encoded.position(), encoded.remaining());
return bab;
}
private static void writeBytes(
final ByteArrayBuffer b, final OutputStream out) throws IOException {
out.write(b.buffer(), 0, b.length());
}
private static void writeBytes(
final String s, final Charset charset, final OutputStream out) throws IOException {
ByteArrayBuffer b = encode(charset, s);
writeBytes(b, out);
}
private static void writeBytes(
final String s, final OutputStream out) throws IOException {
ByteArrayBuffer b = encode(MIME.DEFAULT_CHARSET, s);
writeBytes(b, out);
}
private static void writeField(
final MinimalField field, final OutputStream out) throws IOException {
writeBytes(field.getName(), out);
writeBytes(FIELD_SEP, out);
writeBytes(field.getBody(), out);
writeBytes(CR_LF, out);
}
private static void writeField(
final MinimalField field, final Charset charset, final OutputStream out) throws IOException {
writeBytes(field.getName(), charset, out);
writeBytes(FIELD_SEP, out);
writeBytes(field.getBody(), charset, out);
writeBytes(CR_LF, out);
}
private static final ByteArrayBuffer FIELD_SEP = encode(MIME.DEFAULT_CHARSET, ": ");
private static final ByteArrayBuffer CR_LF = encode(MIME.DEFAULT_CHARSET, "\r\n");
private static final ByteArrayBuffer TWO_DASHES = encode(MIME.DEFAULT_CHARSET, "--");
private final String subType;
private final Charset charset;
private final String boundary;
private final List parts;
private final HttpMultipartMode mode;
/**
* Creates an instance with the specified settings.
*
* @param subType mime subtype - must not be {@code null}
* @param charset the character set to use. May be {@code null}, in which case {@link MIME#DEFAULT_CHARSET} - i.e. US-ASCII - is used.
* @param boundary to use - must not be {@code null}
* @param mode the mode to use
* @throws IllegalArgumentException if charset is null or boundary is null
*/
public HttpMultipart(final String subType, final Charset charset, final String boundary, HttpMultipartMode mode) {
super();
if (subType == null) {
throw new IllegalArgumentException("Multipart subtype may not be null");
}
if (boundary == null) {
throw new IllegalArgumentException("Multipart boundary may not be null");
}
this.subType = subType;
this.charset = charset != null ? charset : MIME.DEFAULT_CHARSET;
this.boundary = boundary;
this.parts = new ArrayList();
this.mode = mode;
}
/**
* Creates an instance with the specified settings.
* Mode is set to {@link HttpMultipartMode#STRICT}
*
* @param subType mime subtype - must not be {@code null}
* @param charset the character set to use. May be {@code null}, in which case {@link MIME#DEFAULT_CHARSET} - i.e. US-ASCII - is used.
* @param boundary to use - must not be {@code null}
* @throws IllegalArgumentException if charset is null or boundary is null
*/
public HttpMultipart(final String subType, final Charset charset, final String boundary) {
this(subType, charset, boundary, HttpMultipartMode.STRICT);
}
public HttpMultipart(final String subType, final String boundary) {
this(subType, null, boundary);
}
public String getSubType() {
return this.subType;
}
public Charset getCharset() {
return this.charset;
}
public HttpMultipartMode getMode() {
return this.mode;
}
public List getBodyParts() {
return this.parts;
}
public void addBodyPart(final FormBodyPart part) {
if (part == null) {
return;
}
this.parts.add(part);
}
public String getBoundary() {
return this.boundary;
}
private void doWriteTo(
final HttpMultipartMode mode,
final OutputStream out,
boolean writeContent) throws IOException {
ByteArrayBuffer boundary = encode(this.charset, getBoundary());
for (FormBodyPart part: this.parts) {
writeBytes(TWO_DASHES, out);
writeBytes(boundary, out);
writeBytes(CR_LF, out);
Header header = part.getHeader();
switch (mode) {
case STRICT:
for (MinimalField field: header) {
writeField(field, out);
}
break;
case BROWSER_COMPATIBLE:
// Only write Content-Disposition
// Use content charset
MinimalField cd = part.getHeader().getField(MIME.CONTENT_DISPOSITION);
writeField(cd, this.charset, out);
String filename = part.getBody().getFilename();
if (filename != null) {
MinimalField ct = part.getHeader().getField(MIME.CONTENT_TYPE);
writeField(ct, this.charset, out);
}
break;
}
writeBytes(CR_LF, out);
if (writeContent) {
part.getBody().writeTo(out);
}
writeBytes(CR_LF, out);
}
writeBytes(TWO_DASHES, out);
writeBytes(boundary, out);
writeBytes(TWO_DASHES, out);
writeBytes(CR_LF, out);
}
/**
* Writes out the content in the multipart/form encoding. This method
* produces slightly different formatting depending on its compatibility
* mode.
*
* @see #getMode()
*/
public void writeTo(final OutputStream out) throws IOException {
doWriteTo(this.mode, out, true);
}
/**
* Determines the total length of the multipart content (content length of
* individual parts plus that of extra elements required to delimit the parts
* from one another). If any of the @{link BodyPart}s contained in this object
* is of a streaming entity of unknown length the total length is also unknown.
*
* This method buffers only a small amount of data in order to determine the
* total length of the entire entity. The content of individual parts is not
* buffered.
*
* @return total length of the multipart entity if known, -1
* otherwise.
*/
public long getTotalLength() {
long contentLen = 0;
for (FormBodyPart part: this.parts) {
ContentBody body = part.getBody();
long len = body.getContentLength();
if (len >= 0) {
contentLen += len;
} else {
return -1;
}
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
doWriteTo(this.mode, out, false);
byte[] extra = out.toByteArray();
return contentLen + extra.length;
} catch (IOException ex) {
// Should never happen
return -1;
}
}
}
