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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// 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.
//
// 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 jodd.net;
import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
/**
* URL decoder.
*/
public class URLDecoder {
/**
* Decodes URL elements.
*/
public static String decode(final String url) {
return decode(url, StandardCharsets.UTF_8, false);
}
/**
* Decodes URL elements. This method may be used for all
* parts of URL, except for the query parts, since it does
* not decode the '+' character.
* @see #decodeQuery(String, Charset)
*/
public static String decode(final String source, final Charset encoding) {
return decode(source, encoding, false);
}
/**
* Decodes query name or value.
*/
public static String decodeQuery(final String source) {
return decode(source, StandardCharsets.UTF_8, true);
}
/**
* Decodes query name or value.
*/
public static String decodeQuery(final String source, final Charset encoding) {
return decode(source, encoding, true);
}
private static String decode(final String source, final Charset encoding, final boolean decodePlus) {
final int length = source.length();
final ByteArrayOutputStream bos = new ByteArrayOutputStream(length);
boolean changed = false;
for (int i = 0; i < length; i++) {
int ch = source.charAt(i);
switch (ch) {
case '%':
if ((i + 2) < length) {
final char hex1 = source.charAt(i + 1);
final char hex2 = source.charAt(i + 2);
final int u = Character.digit(hex1, 16);
final int l = Character.digit(hex2, 16);
if (u == -1 || l == -1) {
throw new IllegalArgumentException("Invalid sequence: " + source.substring(i));
}
bos.write((char) ((u << 4) + l));
i += 2;
changed = true;
} else {
throw new IllegalArgumentException("Invalid sequence: " + source.substring(i));
}
break;
case '+':
if (decodePlus) {
ch = ' ';
changed = true;
}
default:
bos.write(ch);
}
}
return changed ? new String(bos.toByteArray(), encoding) : source;
}
}
