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/*
* Copyright 2014 Groupon, Inc
* Copyright 2014 The Billing Project, LLC
*
* The Billing Project licenses this file to you 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 org.killbill.billing.plugin.util.http;
/**
* Convenience class that encapsulates details of "percent encoding"
* (as per RFC-3986, see [http://www.ietf.org/rfc/rfc3986.txt]).
*/
public final class UTF8UrlEncoder {
/**
* Encoding table used for figuring out ascii characters that must be escaped
* (all non-Ascii characters need to be encoded anyway)
*/
private static final boolean[] SAFE_ASCII = new boolean[128];
static {
for (int i = 'a'; i <= 'z'; ++i) {
SAFE_ASCII[i] = true;
}
for (int i = 'A'; i <= 'Z'; ++i) {
SAFE_ASCII[i] = true;
}
for (int i = '0'; i <= '9'; ++i) {
SAFE_ASCII[i] = true;
}
SAFE_ASCII['-'] = true;
SAFE_ASCII['.'] = true;
SAFE_ASCII['_'] = true;
SAFE_ASCII['~'] = true;
}
private static final char[] HEX = "0123456789ABCDEF".toCharArray();
private UTF8UrlEncoder() {
}
public static String encode(final CharSequence input) {
return encode(input, false);
}
public static String encode(final CharSequence input, final boolean encodeSpaceUsingPlus) {
final StringBuilder sb = new StringBuilder(input.length() + 16);
appendEncoded(sb, input, encodeSpaceUsingPlus);
return sb.toString();
}
public static StringBuilder appendEncoded(final StringBuilder sb, final CharSequence input) {
return appendEncoded(sb, input, false);
}
public static StringBuilder appendEncoded(final StringBuilder sb, final CharSequence input, final boolean encodeSpaceUsingPlus) {
int c;
for (int i = 0; i < input.length(); i += Character.charCount(c)) {
c = Character.codePointAt(input, i);
if (c <= 127) {
if (SAFE_ASCII[c]) {
sb.append((char) c);
} else {
appendSingleByteEncoded(sb, c, encodeSpaceUsingPlus);
}
} else {
appendMultiByteEncoded(sb, c, encodeSpaceUsingPlus);
}
}
return sb;
}
private static void appendSingleByteEncoded(final StringBuilder sb, final int value, final boolean encodeSpaceUsingPlus) {
if (encodeSpaceUsingPlus && value == 32) {
sb.append('+');
return;
}
sb.append('%');
sb.append(HEX[value >> 4]);
sb.append(HEX[value & 0xF]);
}
private static void appendMultiByteEncoded(final StringBuilder sb, final int value, final boolean encodeSpaceUsingPlus) {
if (value < 0x800) {
appendSingleByteEncoded(sb, (0xc0 | (value >> 6)), encodeSpaceUsingPlus);
appendSingleByteEncoded(sb, (0x80 | (value & 0x3f)), encodeSpaceUsingPlus);
} else if (value < 0x10000) {
appendSingleByteEncoded(sb, (0xe0 | (value >> 12)), encodeSpaceUsingPlus);
appendSingleByteEncoded(sb, (0x80 | ((value >> 6) & 0x3f)), encodeSpaceUsingPlus);
appendSingleByteEncoded(sb, (0x80 | (value & 0x3f)), encodeSpaceUsingPlus);
} else {
appendSingleByteEncoded(sb, (0xf0 | (value >> 18)), encodeSpaceUsingPlus);
appendSingleByteEncoded(sb, (0x80 | (value >> 12) & 0x3f), encodeSpaceUsingPlus);
appendSingleByteEncoded(sb, (0x80 | (value >> 6) & 0x3f), encodeSpaceUsingPlus);
appendSingleByteEncoded(sb, (0x80 | (value & 0x3f)), encodeSpaceUsingPlus);
}
}
}
