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net.ymate.platform.webmvc.util.StringEscapeUtils Maven / Gradle / Ivy
/*
* Copyright 2007-2017 the original author or authors.
*
* Licensed 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 net.ymate.platform.webmvc.util;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.exception.NestableRuntimeException;
import org.apache.commons.lang.text.StrBuilder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.io.InputStream;
import java.util.*;
/**
* @author 刘镇 ([email protected] ) on 15/11/5 下午4:35
* @version 1.0
*/
public class StringEscapeUtils {
private static final Log __LOG = LogFactory.getLog(StringEscapeUtils.class);
private static final Map __HTML_TO_CHAR_MAPS = new HashMap();
private static final String[] __CHAR_TO_HTML_ARRAY = new String[3000];
private static final char REFERENCE_START = '&';
private static final String DECIMAL_REFERENCE_START = "&#";
private static final String HEX_REFERENCE_START = "&#x";
private static final char REFERENCE_END = ';';
private static final char CHAR_NULL = (char) -1;
private static final char CSV_DELIMITER = ',';
private static final char CSV_QUOTE = '"';
private static final String CSV_QUOTE_STR = String.valueOf(CSV_QUOTE);
private static final char CR = '\r';
private static final char LF = '\n';
private static final char[] CSV_SEARCH_CHARS = new char[]{CSV_DELIMITER, CSV_QUOTE, CR, LF};
static {
Properties _configs = new Properties();
InputStream _in = MimeTypeUtils.class.getClassLoader().getResourceAsStream("htmlchars-conf.properties");
if (_in == null) {
_in = MimeTypeUtils.class.getClassLoader().getResourceAsStream("META-INF/htmlchars-default-conf.properties");
}
if (_in != null) {
try {
_configs.load(_in);
} catch (IOException e) {
__LOG.warn("", e);
} finally {
try {
_in.close();
} catch (IOException e) {
__LOG.warn("", e);
}
}
}
//
Enumeration _names = _configs.propertyNames();
while (_names.hasMoreElements()) {
String _name = (String) _names.nextElement();
int _char = Integer.parseInt(_name);
int _idx = (_char < 1000 ? _char : _char - 7000);
String _ref = _configs.getProperty(_name);
__CHAR_TO_HTML_ARRAY[_idx] = REFERENCE_START + _ref + REFERENCE_END;
__HTML_TO_CHAR_MAPS.put(_ref, (char) _char);
}
}
private static String __doConvertToReference(char character) {
if (character < 1000 || (character >= 8000 && character < 10000)) {
int _idx = (character < 1000 ? character : character - 7000);
String _html = __CHAR_TO_HTML_ARRAY[_idx];
if (_html != null) {
return _html;
}
}
return null;
}
private static char __doConvertToCharacter(String entityReference) {
Character _char = __HTML_TO_CHAR_MAPS.get(entityReference);
if (_char != null) {
return _char;
}
return CHAR_NULL;
}
private static int __doGetSupportedReferenceCount() {
return __HTML_TO_CHAR_MAPS.size();
}
private static boolean __isMappedToReference(char character) {
return (__doConvertToReference(character) != null);
}
public static String escapeHtml(String input) {
if (input == null) {
return null;
}
StringBuilder escaped = new StringBuilder(input.length() * 2);
for (int i = 0; i < input.length(); i++) {
char character = input.charAt(i);
String reference = __doConvertToReference(character);
if (reference != null) {
escaped.append(reference);
} else {
escaped.append(character);
}
}
return escaped.toString();
}
public static String escapeHtmlDecimal(String input) {
if (input == null) {
return null;
}
StringBuilder escaped = new StringBuilder(input.length() * 2);
for (int i = 0; i < input.length(); i++) {
char character = input.charAt(i);
if (__isMappedToReference(character)) {
escaped.append(DECIMAL_REFERENCE_START);
escaped.append((int) character);
escaped.append(REFERENCE_END);
} else {
escaped.append(character);
}
}
return escaped.toString();
}
public static String escapeHtmlHex(String input) {
if (input == null) {
return null;
}
StringBuilder escaped = new StringBuilder(input.length() * 2);
for (int i = 0; i < input.length(); i++) {
char character = input.charAt(i);
if (__isMappedToReference(character)) {
escaped.append(HEX_REFERENCE_START);
escaped.append(Integer.toString((int) character, 16));
escaped.append(REFERENCE_END);
} else {
escaped.append(character);
}
}
return escaped.toString();
}
public static String escapeXml(String input) {
if (input == null) {
return null;
}
StringBuilder escaped = new StringBuilder(input.length() * 2);
for (int i = 0; i < input.length(); i++) {
char character = input.charAt(i);
switch (character) {
case 34:
case 38:
case 60:
case 62:
case 39:
String _char = __doConvertToReference(character);
if (_char != null) {
escaped.append(_char);
} else {
escaped.append(character);
}
break;
default:
escaped.append(character);
}
}
return escaped.toString();
}
public static String unescapeHtml(String input) {
if (input == null) {
return null;
}
return new HtmlCharacterEntityDecoder(input).decode();
}
public static String unescapeXml(String input) {
if (input == null) {
return null;
}
return new HtmlCharacterEntityDecoder(input).decode();
}
public static String escapeJavaScript(String input) {
StringBuilder writer = new StringBuilder();
escapeJavaStyleString(writer, input, true, true);
return writer.toString();
}
public static String escapeJava(String input) {
StringBuilder writer = new StringBuilder();
escapeJavaStyleString(writer, input, false, false);
return writer.toString();
}
private static String hex(char ch) {
return Integer.toHexString(ch).toUpperCase(Locale.ENGLISH);
}
private static void escapeJavaStyleString(StringBuilder out, String str, boolean escapeSingleQuote, boolean escapeForwardSlash) {
if (out == null) {
throw new IllegalArgumentException("The Writer must not be null");
}
if (str == null) {
return;
}
int sz = str.length();
for (int i = 0; i < sz; i++) {
char ch = str.charAt(i);
if (ch > 0xfff) {
out.append("\\u").append(hex(ch));
} else if (ch > 0xff) {
out.append("\\u0").append(hex(ch));
} else if (ch > 0x7f) {
out.append("\\u00").append(hex(ch));
} else if (ch < 32) {
switch (ch) {
case '\b':
out.append('\\');
out.append('b');
break;
case '\n':
out.append('\\');
out.append('n');
break;
case '\t':
out.append('\\');
out.append('t');
break;
case '\f':
out.append('\\');
out.append('f');
break;
case '\r':
out.append('\\');
out.append('r');
break;
default:
if (ch > 0xf) {
out.append("\\u00").append(hex(ch));
} else {
out.append("\\u000").append(hex(ch));
}
break;
}
} else {
switch (ch) {
case '\'':
if (escapeSingleQuote) {
out.append('\\');
}
out.append('\'');
break;
case '"':
out.append('\\');
out.append('"');
break;
case '\\':
out.append('\\');
out.append('\\');
break;
case '/':
if (escapeForwardSlash) {
out.append('\\');
}
out.append('/');
break;
default:
out.append(ch);
break;
}
}
}
}
public static String unescapeJava(String str) {
if (str == null) {
return null;
}
int sz = str.length();
StringBuilder out = new StringBuilder();
StrBuilder unicode = new StrBuilder(4);
boolean hadSlash = false;
boolean inUnicode = false;
for (int i = 0; i < sz; i++) {
char ch = str.charAt(i);
if (inUnicode) {
unicode.append(ch);
if (unicode.length() == 4) {
try {
int value = Integer.parseInt(unicode.toString(), 16);
out.append((char) value);
unicode.setLength(0);
inUnicode = false;
hadSlash = false;
} catch (NumberFormatException nfe) {
throw new NestableRuntimeException("Unable to parse unicode value: " + unicode, nfe);
}
}
continue;
}
if (hadSlash) {
hadSlash = false;
switch (ch) {
case '\\':
out.append('\\');
break;
case '\'':
out.append('\'');
break;
case '\"':
out.append('"');
break;
case 'r':
out.append('\r');
break;
case 'f':
out.append('\f');
break;
case 't':
out.append('\t');
break;
case 'n':
out.append('\n');
break;
case 'b':
out.append('\b');
break;
case 'u': {
inUnicode = true;
break;
}
default:
out.append(ch);
break;
}
continue;
} else if (ch == '\\') {
hadSlash = true;
continue;
}
out.append(ch);
}
if (hadSlash) {
out.append('\\');
}
return out.toString();
}
public static String unescapeJavaScript(String str) {
return unescapeJava(str);
}
public static String escapeSql(String str) {
if (str == null) {
return null;
}
return StringUtils.replace(str, "'", "''");
}
public static String escapeCsv(String str) {
if (StringUtils.containsNone(str, CSV_SEARCH_CHARS)) {
if (str != null) {
return str;
}
return null;
}
StringBuilder _out = new StringBuilder();
_out.append(CSV_QUOTE);
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
if (c == CSV_QUOTE) {
_out.append(CSV_QUOTE);
}
_out.append(c);
}
return _out.append(CSV_QUOTE).toString();
}
public static String unescapeCsv(String str) {
if (str == null) {
return null;
}
if (str.length() < 2) {
return str;
}
if (str.charAt(0) != CSV_QUOTE || str.charAt(str.length() - 1) != CSV_QUOTE) {
return str;
}
String quoteless = str.substring(1, str.length() - 1);
if (StringUtils.containsAny(quoteless, CSV_SEARCH_CHARS)) {
str = StringUtils.replace(quoteless, CSV_QUOTE_STR + CSV_QUOTE_STR, CSV_QUOTE_STR);
}
return str;
}
static class HtmlCharacterEntityDecoder {
private static final int MAX_REFERENCE_SIZE = 10;
private final String originalMessage;
private final StringBuilder decodedMessage;
private int currentPosition = 0;
private int nextPotentialReferencePosition = -1;
private int nextSemicolonPosition = -2;
public HtmlCharacterEntityDecoder(String original) {
this.originalMessage = original;
this.decodedMessage = new StringBuilder(originalMessage.length());
}
public String decode() {
while (currentPosition < originalMessage.length()) {
findNextPotentialReference(currentPosition);
copyCharactersTillPotentialReference();
processPossibleReference();
}
return decodedMessage.toString();
}
private void findNextPotentialReference(int startPosition) {
nextPotentialReferencePosition = Math.max(startPosition, nextSemicolonPosition - MAX_REFERENCE_SIZE);
do {
nextPotentialReferencePosition =
originalMessage.indexOf('&', nextPotentialReferencePosition);
if (nextSemicolonPosition != -1 &&
nextSemicolonPosition < nextPotentialReferencePosition) {
nextSemicolonPosition = originalMessage.indexOf(';', nextPotentialReferencePosition + 1);
}
boolean isPotentialReference =
nextPotentialReferencePosition != -1
&& nextSemicolonPosition != -1
&& nextPotentialReferencePosition - nextSemicolonPosition < MAX_REFERENCE_SIZE;
if (isPotentialReference) {
break;
}
if (nextPotentialReferencePosition == -1) {
break;
}
if (nextSemicolonPosition == -1) {
nextPotentialReferencePosition = -1;
break;
}
nextPotentialReferencePosition = nextPotentialReferencePosition + 1;
}
while (nextPotentialReferencePosition != -1);
}
private void copyCharactersTillPotentialReference() {
if (nextPotentialReferencePosition != currentPosition) {
int skipUntilIndex = nextPotentialReferencePosition != -1 ?
nextPotentialReferencePosition : originalMessage.length();
if (skipUntilIndex - currentPosition > 3) {
decodedMessage.append(originalMessage.substring(currentPosition, skipUntilIndex));
currentPosition = skipUntilIndex;
} else {
while (currentPosition < skipUntilIndex) {
decodedMessage.append(originalMessage.charAt(currentPosition++));
}
}
}
}
private void processPossibleReference() {
if (nextPotentialReferencePosition != -1) {
boolean isNumberedReference = originalMessage.charAt(currentPosition + 1) == '#';
boolean wasProcessable = isNumberedReference ? processNumberedReference() : processNamedReference();
if (wasProcessable) {
currentPosition = nextSemicolonPosition + 1;
} else {
char currentChar = originalMessage.charAt(currentPosition);
decodedMessage.append(currentChar);
currentPosition++;
}
}
}
private boolean processNumberedReference() {
boolean isHexNumberedReference =
originalMessage.charAt(nextPotentialReferencePosition + 2) == 'x' ||
originalMessage.charAt(nextPotentialReferencePosition + 2) == 'X';
try {
int value = (!isHexNumberedReference) ?
Integer.parseInt(getReferenceSubstring(2)) :
Integer.parseInt(getReferenceSubstring(3), 16);
decodedMessage.append((char) value);
return true;
} catch (NumberFormatException ex) {
return false;
}
}
private boolean processNamedReference() {
String referenceName = getReferenceSubstring(1);
char mappedCharacter = __doConvertToCharacter(referenceName);
if (mappedCharacter != CHAR_NULL) {
decodedMessage.append(mappedCharacter);
return true;
}
return false;
}
private String getReferenceSubstring(int referenceOffset) {
return originalMessage.substring(nextPotentialReferencePosition + referenceOffset, nextSemicolonPosition);
}
}
}
