com.jcabi.http.request.Boundary Maven / Gradle / Ivy

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/*
 * Copyright (c) 2011-2017, jcabi.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 1) Redistributions of source code must retain the above
 * copyright notice, this list of conditions and the following
 * disclaimer. 2) Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided
 * with the distribution. 3) Neither the name of the jcabi.com nor
 * the names of its contributors may be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.jcabi.http.request;

import com.jcabi.aspects.Immutable;
import com.jcabi.aspects.Loggable;
import java.util.Random;

/**
 * Boundary for content-type multipart/form-data.
 * This is a copy of boundary created by Apache HttpComponents HttpClient 4.5.
 *
 * @since 1.0
 */
@Immutable
@Loggable(Loggable.DEBUG)
public final class Boundary {
    /**
     * The pool of ASCII chars to be used for generating a multipart boundary.
     */
    private static final char[] MULTIPART_CHARS =
        "-_1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
            .toCharArray();

    /**
     * Generation of pseudorandom numbers.
     */
    private final transient Random rand;

    /**
     * Constructor with new random number generation.
     */
    public Boundary() {
        this(new Random());
    }

    /**
     * Ctor.
     * @param random Random number generation.
     */
    public Boundary(final Random random) {
        this.rand = random;
    }

    /**
     * Generates random boundary with random size from 30 to 40.
     * @return Boundary value.
     */
    public String value() {
        final StringBuilder buffer = new StringBuilder();
        final int count = this.rand.nextInt(11) + 30;
        for (int index = 0; index < count; ++index) {
            buffer.append(
                Boundary.MULTIPART_CHARS[
                    this.rand.nextInt(MULTIPART_CHARS.length)
                    ]
            );
        }
        return buffer.toString();
    }
}