com.clarifai.api.Multipart Maven / Gradle / Ivy
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package com.clarifai.api;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.Random;
class Multipart {
private static final Charset UTF8 = Charset.forName("UTF-8");
private static final int BUFFER_SIZE = 4096;
private OutputStream out;
private final String boundary;
public Multipart() {
boundary = Long.toHexString(new Random().nextLong());
}
public String getBoundary() {
return boundary;
}
public void start(OutputStream out) {
this.out = out;
}
public void finish() throws IOException {
out.write(("--" + boundary + "--\r\n").getBytes(UTF8));
out.flush();
}
public void writeParameter(String name, String value) throws IOException {
writeBoundary();
String payload = "Content-Disposition: form-data; " +
"name=\"" + name + "\"\r\n\r\n" + value + "\r\n";
out.write(payload.getBytes(UTF8));
}
/** Writes media from the input stream. Does not close the input stream. */
public void writeMedia(String name, String filename, InputStream in) throws IOException {
writeBoundary();
String header = "Content-Disposition: form-data;" +
" name=\"" + name + "\";" +
" filename=\"" + filename + "\"\r\n" +
"Content-Type: application/octet-stream\r\n\r\n";
out.write(header.getBytes(UTF8));
byte[] buf = new byte[BUFFER_SIZE];
while (true) {
int numRead = in.read(buf);
if (numRead < 0) {
break;
}
out.write(buf, 0, numRead);
}
out.write("\r\n".getBytes(UTF8));
}
private void writeBoundary() throws IOException {
out.write(("--" + boundary + "\r\n").getBytes(UTF8));
}
}