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/*
* Copyright (C) 2013 Square, Inc.
*
* Licensed 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 retrofit.mime;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
public final class MultipartTypedOutput implements TypedOutput {
public static final String DEFAULT_TRANSFER_ENCODING = "binary";
private static final class MimePart {
private final TypedOutput body;
private final String name;
private final String transferEncoding;
private final boolean isFirst;
private final String boundary;
private byte[] partBoundary;
private byte[] partHeader;
private boolean isBuilt;
public MimePart(String name, String transferEncoding, TypedOutput body, String boundary,
boolean isFirst) {
this.name = name;
this.transferEncoding = transferEncoding;
this.body = body;
this.isFirst = isFirst;
this.boundary = boundary;
}
public void writeTo(OutputStream out) throws IOException {
build();
out.write(partBoundary);
out.write(partHeader);
body.writeTo(out);
}
public long size() {
build();
if (body.length() > -1) {
return body.length() + partBoundary.length + partHeader.length;
} else {
return -1;
}
}
private void build() {
if (isBuilt) return;
partBoundary = buildBoundary(boundary, isFirst, false);
partHeader = buildHeader(name, transferEncoding, body);
isBuilt = true;
}
}
private final List mimeParts = new LinkedList();
private final byte[] footer;
private final String boundary;
private long length;
public MultipartTypedOutput() {
this(UUID.randomUUID().toString());
}
MultipartTypedOutput(String boundary) {
this.boundary = boundary;
footer = buildBoundary(boundary, false, true);
length = footer.length;
}
List getParts() throws IOException {
List parts = new ArrayList(mimeParts.size());
for (MimePart part : mimeParts) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
part.writeTo(bos);
parts.add(bos.toByteArray());
}
return parts;
}
public void addPart(String name, TypedOutput body) {
addPart(name, DEFAULT_TRANSFER_ENCODING, body);
}
public void addPart(String name, String transferEncoding, TypedOutput body) {
if (name == null) {
throw new NullPointerException("Part name must not be null.");
}
if (transferEncoding == null) {
throw new NullPointerException("Transfer encoding must not be null.");
}
if (body == null) {
throw new NullPointerException("Part body must not be null.");
}
MimePart part = new MimePart(name, transferEncoding, body, boundary, mimeParts.isEmpty());
mimeParts.add(part);
long size = part.size();
if (size == -1) {
length = -1;
} else if (length != -1) {
length += size;
}
}
public int getPartCount() {
return mimeParts.size();
}
@Override public String fileName() {
return null;
}
@Override public String mimeType() {
return "multipart/form-data; boundary=" + boundary;
}
@Override public long length() {
return length;
}
@Override public void writeTo(OutputStream out) throws IOException {
for (MimePart part : mimeParts) {
part.writeTo(out);
}
out.write(footer);
}
private static byte[] buildBoundary(String boundary, boolean first, boolean last) {
try {
// Pre-size for the last boundary, the worst case scenario.
StringBuilder sb = new StringBuilder(boundary.length() + 8);
if (!first) {
sb.append("\r\n");
}
sb.append("--");
sb.append(boundary);
if (last) {
sb.append("--");
}
sb.append("\r\n");
return sb.toString().getBytes("UTF-8");
} catch (IOException ex) {
throw new RuntimeException("Unable to write multipart boundary", ex);
}
}
private static byte[] buildHeader(String name, String transferEncoding, TypedOutput value) {
try {
// Initial size estimate based on always-present strings and conservative value lengths.
StringBuilder headers = new StringBuilder(128);
headers.append("Content-Disposition: form-data; name=\"");
headers.append(name);
String fileName = value.fileName();
if (fileName != null) {
headers.append("\"; filename=\"");
headers.append(fileName);
}
headers.append("\"\r\nContent-Type: ");
headers.append(value.mimeType());
long length = value.length();
if (length != -1) {
headers.append("\r\nContent-Length: ").append(length);
}
headers.append("\r\nContent-Transfer-Encoding: ");
headers.append(transferEncoding);
headers.append("\r\n\r\n");
return headers.toString().getBytes("UTF-8");
} catch (IOException ex) {
throw new RuntimeException("Unable to write multipart header", ex);
}
}
}