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• MultipartUtility.java

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src.main.java.com.aceql.client.jdbc.http.MultipartUtility Maven / Gradle / Ivy

/*
 * This file is part of AceQL Client SDK.
 * AceQL Client SDK: Remote JDBC access over HTTP with AceQL HTTP.
 * Copyright (C) 2020,  KawanSoft SAS
 * (http://www.kawansoft.com). All rights reserved.
 *
 * 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 com.aceql.client.jdbc.http;

import static java.lang.System.currentTimeMillis;
import static java.net.URLConnection.guessContentTypeFromName;
import static java.util.logging.Logger.getLogger;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;

import org.apache.commons.io.IOUtils;

/**
 * @author Nicolas de Pomereu
 *
 */
class MultipartUtility {

    public boolean DEBUG = false;

    @SuppressWarnings("unused")
    private static final Logger log = getLogger(
	    MultipartUtility.class.getName());

    // Keep this! No System.getProperty("line.separator") that fails on
    // Android
    private static final String CRLF = "\r\n";

    private static final String CHARSET = "UTF-8";

    private HttpURLConnection connection;

    private final OutputStream outputStream;
    private final Writer writer;
    private final String boundary;

    private AtomicInteger progress;
    private AtomicBoolean cancelled;
    private long totalLength;

    public MultipartUtility(final URL url, HttpURLConnection connection,
	    int connectTimeout, AtomicInteger progress, AtomicBoolean cancelled,
	    long totalLength) throws IOException {

	if (url == null) {
	    Objects.requireNonNull(url, "url cannot be null!");
	}

	if (connection == null) {
	    Objects.requireNonNull(connection, "connection cannot be null!");
	}

	this.progress = progress;
	this.cancelled = cancelled;
	this.totalLength = totalLength;
	this.connection = connection;

	boundary = "---------------------------" + currentTimeMillis();

	this.connection.setRequestProperty("Accept-Charset", CHARSET);
	this.connection.setRequestProperty("Content-Type",
		"multipart/form-data; boundary=" + boundary);

	// outputStream = connection.getOutputStream();
	TimeoutConnector timeoutConnector = new TimeoutConnector(connection,
		connectTimeout);
	outputStream = timeoutConnector.getOutputStream();

	writer = new PrintWriter(new OutputStreamWriter(outputStream, CHARSET));
    }

    public void addFormField(final String name, final String value)
	    throws IOException {
	writer.append("--").append(boundary).append(CRLF)
		.append("Content-Disposition: form-data; name=\"").append(name)
		.append("\"").append(CRLF)
		.append("Content-Type: text/plain; charset=").append(CHARSET)
		.append(CRLF).append(CRLF).append(value).append(CRLF);
    }

    public void addFilePart(final String fieldName, InputStream inputStream,
	    String fileName) throws IOException, InterruptedException {
	// final String fileName = uploadFile.getName();
	writer.append("--").append(boundary).append(CRLF)
		.append("Content-Disposition: form-data; name=\"")
		.append(fieldName).append("\"; filename=\"").append(fileName)
		.append("\"").append(CRLF).append("Content-Type: ")
		.append(guessContentTypeFromName(fileName)).append(CRLF)
		.append("Content-Transfer-Encoding: binary").append(CRLF)
		.append(CRLF);

	writer.flush();
	// outputStream.flush();

	// InputStream inputStream = new BufferedInputStream(
	// new FileInputStream(uploadFile));

	uploadUsingInputStream(inputStream);

    }

    public void addFilePart(final String fieldName, final File uploadFile)
	    throws IOException, InterruptedException {
	final String fileName = uploadFile.getName();
	writer.append("--").append(boundary).append(CRLF)
		.append("Content-Disposition: form-data; name=\"")
		.append(fieldName).append("\"; filename=\"").append(fileName)
		.append("\"").append(CRLF).append("Content-Type: ")
		.append(guessContentTypeFromName(fileName)).append(CRLF)
		.append("Content-Transfer-Encoding: binary").append(CRLF)
		.append(CRLF);

	writer.flush();
	// outputStream.flush();

	InputStream inputStream = new BufferedInputStream(
		new FileInputStream(uploadFile));

	uploadUsingInputStream(inputStream);

    }

    private void uploadUsingInputStream(InputStream inputStream)
	    throws IOException, InterruptedException {
	try {
	    /*
	     * int readBufferSize = 4096;
	     *
	     * final byte[] buffer = new byte[readBufferSize]; int bytesRead;
	     * while ((bytesRead = inputStream.read(buffer)) != -1) {
	     * outputStream.write(buffer, 0, bytesRead); }
	     */

	    debug("totalLength: " + totalLength);
	    debug("progress   : " + progress);
	    debug("cancelled  : " + cancelled);

	    // Case no progress/cancelled/totaLenth set: direct copy
	    if (totalLength <= 0 || progress == null || cancelled == null) {
		IOUtils.copy(inputStream, outputStream);
		return;
	    }

	    int tempLen = 0;
	    byte[] buffer = new byte[1024 * 4];
	    int n = 0;

	    while ((n = inputStream.read(buffer)) != -1) {
		tempLen += n;

		if (totalLength > 0 && tempLen > totalLength / 100) {
		    tempLen = 0;
		    int cpt = progress.get();
		    cpt++;

		    // Update the progress value for progress
		    // indicator
		    progress.set(Math.min(99, cpt));
		    debug("progress   : " + progress);
		}

		// If progress indicator says that user has cancelled the
		// download, stop now!
		if (cancelled.get()) {
		    throw new InterruptedException(
			    "Blob upload cancelled by user.");
		}

		outputStream.write(buffer, 0, n);
	    }

	    // outputStream.flush();
	    // writer.append(CRLF); // No! will fail by adding it to the
	    // uploaded file
	} finally {

	    if (inputStream != null) {
		try {
		    inputStream.close();
		} catch (Exception ignore) {
		    // ignore
		}
	    }
	}
    }

    public void addHeaderField(String name, String value) throws IOException {
	writer.append(name).append(": ").append(value).append(CRLF);
    }

    public void finish() throws IOException {
	writer.append(CRLF).append("--").append(boundary).append("--")
		.append(CRLF);
	writer.close();

    }

    /**
     * Returns the current HttpUrlConnection in use.
     *
     * @return the current HttpUrlConnection in use
     */
    public HttpURLConnection getConnection() {
	return connection;
    }

    private void debug(String s) {
	if (DEBUG) {
	    System.out.println(new java.util.Date() + " " + s);
	}

    }
}