/*
* ====================================================================
* 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
* <http://www.apache.org/>.
*
*/
package org.apache.http.entity.mime;
import java.io.File;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import org.apache.http.HttpEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.content.ByteArrayBody;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.InputStreamBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.util.Args;
/**
* Builder for multipart {@link HttpEntity}s.
*
* @since 4.3
*/
public class MultipartEntityBuilder {
/**
* The pool of ASCII chars to be used for generating a multipart boundary.
*/
private final static char[] MULTIPART_CHARS =
"-_1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
.toCharArray();
private final static String DEFAULT_SUBTYPE = "form-data";
private String subType = DEFAULT_SUBTYPE;
private HttpMultipartMode mode = HttpMultipartMode.STRICT;
private String boundary = null;
private Charset charset = null;
private List<FormBodyPart> bodyParts = null;
public static MultipartEntityBuilder create() {
return new MultipartEntityBuilder();
}
MultipartEntityBuilder() {
super();
}
public MultipartEntityBuilder setMode(final HttpMultipartMode mode) {
this.mode = mode;
return this;
}
public MultipartEntityBuilder setLaxMode() {
this.mode = HttpMultipartMode.BROWSER_COMPATIBLE;
return this;
}
public MultipartEntityBuilder setStrictMode() {
this.mode = HttpMultipartMode.STRICT;
return this;
}
public MultipartEntityBuilder setBoundary(final String boundary) {
this.boundary = boundary;
return this;
}
public MultipartEntityBuilder setCharset(final Charset charset) {
this.charset = charset;
return this;
}
MultipartEntityBuilder addPart(final FormBodyPart bodyPart) {
if (bodyPart == null) {
return this;
}
if (this.bodyParts == null) {
this.bodyParts = new ArrayList<FormBodyPart>();
}
this.bodyParts.add(bodyPart);
return this;
}
public MultipartEntityBuilder addPart(final String name, final ContentBody contentBody) {
Args.notNull(name, "Name");
Args.notNull(contentBody, "Content body");
return addPart(new FormBodyPart(name, contentBody));
}
public MultipartEntityBuilder addTextBody(
final String name, final String text, final ContentType contentType) {
return addPart(name, new StringBody(text, contentType));
}
public MultipartEntityBuilder addTextBody(
final String name, final String text) {
return addTextBody(name, text, ContentType.DEFAULT_TEXT);
}
public MultipartEntityBuilder addBinaryBody(
final String name, final byte[] b, final ContentType contentType, final String filename) {
return addPart(name, new ByteArrayBody(b, contentType, filename));
}
public MultipartEntityBuilder addBinaryBody(
final String name, final byte[] b) {
return addBinaryBody(name, b, ContentType.DEFAULT_BINARY, null);
}
public MultipartEntityBuilder addBinaryBody(
final String name, final File file, final ContentType contentType, final String filename) {
return addPart(name, new FileBody(file, contentType, filename));
}
public MultipartEntityBuilder addBinaryBody(
final String name, final File file) {
return addBinaryBody(name, file, ContentType.DEFAULT_BINARY, file != null ? file.getName() : null);
}
public MultipartEntityBuilder addBinaryBody(
final String name, final InputStream stream, final ContentType contentType,
final String filename) {
return addPart(name, new InputStreamBody(stream, contentType, filename));
}
public MultipartEntityBuilder addBinaryBody(final String name, final InputStream stream) {
return addBinaryBody(name, stream, ContentType.DEFAULT_BINARY, null);
}
private String generateContentType(
final String boundary,
final Charset charset) {
final StringBuilder buffer = new StringBuilder();
buffer.append("multipart/form-data; boundary=");
buffer.append(boundary);
if (charset != null) {
buffer.append("; charset=");
buffer.append(charset.name());
}
return buffer.toString();
}
private String generateBoundary() {
final StringBuilder buffer = new StringBuilder();
final Random rand = new Random();
final int count = rand.nextInt(11) + 30; // a random size from 30 to 40
for (int i = 0; i < count; i++) {
buffer.append(MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)]);
}
return buffer.toString();
}
MultipartFormEntity buildEntity() {
final String st = subType != null ? subType : DEFAULT_SUBTYPE;
final Charset cs = charset;
final String b = boundary != null ? boundary : generateBoundary();
final List<FormBodyPart> bps = bodyParts != null ? new ArrayList<FormBodyPart>(bodyParts) :
Collections.<FormBodyPart>emptyList();
final HttpMultipartMode m = mode != null ? mode : HttpMultipartMode.STRICT;
final AbstractMultipartForm form;
switch (m) {
case BROWSER_COMPATIBLE:
form = new HttpBrowserCompatibleMultipart(st, cs, b, bps);
break;
case RFC6532:
form = new HttpRFC6532Multipart(st, cs, b, bps);
break;
default:
form = new HttpStrictMultipart(st, cs, b, bps);
}
return new MultipartFormEntity(form, generateContentType(b, cs), form.getTotalLength());
}
public HttpEntity build() {
return buildEntity();
}
}