org.apache.catalina.util.URLEncoder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.catalina.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.BitSet;
/**
*
* This class is very similar to the java.net.URLEncoder class.
*
* Unfortunately, with java.net.URLEncoder there is no way to specify to the
* java.net.URLEncoder which characters should NOT be encoded.
*
* This code was moved from DefaultServlet.java
*
* @author Craig R. McClanahan
* @author Remy Maucherat
*/
public class URLEncoder {
protected static final char[] hexadecimal =
{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'};
//Array containing the safe characters set.
protected BitSet safeCharacters = new BitSet(256);
public URLEncoder() {
for (char i = 'a'; i <= 'z'; i++) {
addSafeCharacter(i);
}
for (char i = 'A'; i <= 'Z'; i++) {
addSafeCharacter(i);
}
for (char i = '0'; i <= '9'; i++) {
addSafeCharacter(i);
}
}
public void addSafeCharacter( char c ) {
safeCharacters.set( c );
}
public String encode( String path ) {
int maxBytesPerChar = 10;
StringBuilder rewrittenPath = new StringBuilder(path.length());
ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar);
OutputStreamWriter writer = null;
try {
writer = new OutputStreamWriter(buf, "UTF8");
} catch (Exception e) {
e.printStackTrace();
writer = new OutputStreamWriter(buf);
}
for (int i = 0; i < path.length(); i++) {
int c = path.charAt(i);
if (safeCharacters.get(c)) {
rewrittenPath.append((char)c);
} else {
// convert to external encoding before hex conversion
try {
writer.write((char)c);
writer.flush();
} catch(IOException e) {
buf.reset();
continue;
}
byte[] ba = buf.toByteArray();
for (int j = 0; j < ba.length; j++) {
// Converting each byte in the buffer
byte toEncode = ba[j];
rewrittenPath.append('%');
int low = toEncode & 0x0f;
int high = (toEncode & 0xf0) >> 4;
rewrittenPath.append(hexadecimal[high]);
rewrittenPath.append(hexadecimal[low]);
}
buf.reset();
}
}
return rewrittenPath.toString();
}
}