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/**
* 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.hadoop.http;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
/**
* This class is responsible for quoting HTML characters.
*/
public class HtmlQuoting {
private static final byte[] AMP_BYTES =
"&".getBytes(StandardCharsets.UTF_8);
private static final byte[] APOS_BYTES =
"'".getBytes(StandardCharsets.UTF_8);
private static final byte[] GT_BYTES =
">".getBytes(StandardCharsets.UTF_8);
private static final byte[] LT_BYTES =
"<".getBytes(StandardCharsets.UTF_8);
private static final byte[] QUOT_BYTES =
""".getBytes(StandardCharsets.UTF_8);
/**
* Does the given string need to be quoted?
* @param data the string to check
* @param off the starting position
* @param len the number of bytes to check
* @return does the string contain any of the active html characters?
*/
public static boolean needsQuoting(byte[] data, int off, int len) {
for(int i=off; i< off+len; ++i) {
switch(data[i]) {
case '&':
case '<':
case '>':
case '\'':
case '"':
return true;
default:
break;
}
}
return false;
}
/**
* Does the given string need to be quoted?
* @param str the string to check
* @return does the string contain any of the active html characters?
*/
public static boolean needsQuoting(String str) {
if (str == null) {
return false;
}
byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
return needsQuoting(bytes, 0 , bytes.length);
}
/**
* Quote all of the active HTML characters in the given string as they
* are added to the buffer.
* @param output the stream to write the output to
* @param buffer the byte array to take the characters from
* @param off the index of the first byte to quote
* @param len the number of bytes to quote
*/
public static void quoteHtmlChars(OutputStream output, byte[] buffer,
int off, int len) throws IOException {
for(int i=off; i < off+len; i++) {
switch (buffer[i]) {
case '&':
output.write(AMP_BYTES);
break;
case '<':
output.write(LT_BYTES);
break;
case '>':
output.write(GT_BYTES);
break;
case '\'':
output.write(APOS_BYTES);
break;
case '"':
output.write(QUOT_BYTES);
break;
default: output.write(buffer, i, 1);
}
}
}
/**
* Quote the given item to make it html-safe.
* @param item the string to quote
* @return the quoted string
*/
public static String quoteHtmlChars(String item) {
if (item == null) {
return null;
}
byte[] bytes = item.getBytes(StandardCharsets.UTF_8);
if (needsQuoting(bytes, 0, bytes.length)) {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
try {
quoteHtmlChars(buffer, bytes, 0, bytes.length);
return buffer.toString("UTF-8");
} catch (IOException ioe) {
// Won't happen, since it is a bytearrayoutputstream
return null;
}
} else {
return item;
}
}
/**
* Return an output stream that quotes all of the output.
* @param out the stream to write the quoted output to
* @return a new stream that the application show write to
* @throws IOException if the underlying output fails
*/
public static OutputStream quoteOutputStream(final OutputStream out
) throws IOException {
return new OutputStream() {
private byte[] data = new byte[1];
@Override
public void write(byte[] data, int off, int len) throws IOException {
quoteHtmlChars(out, data, off, len);
}
@Override
public void write(int b) throws IOException {
data[0] = (byte) b;
quoteHtmlChars(out, data, 0, 1);
}
@Override
public void flush() throws IOException {
out.flush();
}
@Override
public void close() throws IOException {
out.close();
}
};
}
/**
* Remove HTML quoting from a string.
* @param item the string to unquote
* @return the unquoted string
*/
public static String unquoteHtmlChars(String item) {
if (item == null) {
return null;
}
int next = item.indexOf('&');
// nothing was quoted
if (next == -1) {
return item;
}
int len = item.length();
int posn = 0;
StringBuilder buffer = new StringBuilder();
while (next != -1) {
buffer.append(item.substring(posn, next));
if (item.startsWith("&", next)) {
buffer.append('&');
next += 5;
} else if (item.startsWith("'", next)) {
buffer.append('\'');
next += 6;
} else if (item.startsWith(">", next)) {
buffer.append('>');
next += 4;
} else if (item.startsWith("<", next)) {
buffer.append('<');
next += 4;
} else if (item.startsWith(""", next)) {
buffer.append('"');
next += 6;
} else {
int end = item.indexOf(';', next)+1;
if (end == 0) {
end = len;
}
throw new IllegalArgumentException("Bad HTML quoting for " +
item.substring(next,end));
}
posn = next;
next = item.indexOf('&', posn);
}
buffer.append(item.substring(posn, len));
return buffer.toString();
}
public static void main(String[] args) throws Exception {
for(String arg:args) {
System.out.println("Original: " + arg);
String quoted = quoteHtmlChars(arg);
System.out.println("Quoted: "+ quoted);
String unquoted = unquoteHtmlChars(quoted);
System.out.println("Unquoted: " + unquoted);
System.out.println();
}
}
}
