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@ -1,10 +1,6 @@
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package com.ruoyi.common.core.utils.html;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.regex.Matcher;
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@ -15,8 +11,7 @@ import java.util.regex.Pattern;
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*
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* @author ruoyi
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*/
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public final class HTMLFilter
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{
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public final class HtmlFilter {
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/**
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* regex flag union representing /si modifiers in php
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**/
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@ -45,7 +40,9 @@ public final class HTMLFilter
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private static final Pattern P_RIGHT_ARROW = Pattern.compile(">");
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private static final Pattern P_BOTH_ARROWS = Pattern.compile("<>");
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// @xxx could grow large... maybe use sesat's ReferenceMap
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/**
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* @xxx could grow large... maybe use sesat's ReferenceMap
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*/
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private static final ConcurrentMap<String, Pattern> P_REMOVE_PAIR_BLANKS = new ConcurrentHashMap<>();
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private static final ConcurrentMap<String, Pattern> P_REMOVE_SELF_BLANKS = new ConcurrentHashMap<>();
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@ -100,8 +97,7 @@ public final class HTMLFilter
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/**
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* Default constructor.
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*/
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public HTMLFilter()
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{
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public HtmlFilter() {
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vAllowed = new HashMap<>();
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final ArrayList<String> aAtos = new ArrayList<>();
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@ -122,13 +118,13 @@ public final class HTMLFilter
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vAllowed.put("i", noAtts);
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vAllowed.put("em", noAtts);
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vSelfClosingTags = new String[] { "img" };
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vNeedClosingTags = new String[] { "a", "b", "strong", "i", "em" };
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vDisallowed = new String[] {};
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vAllowedProtocols = new String[] { "http", "mailto", "https" }; // no ftp.
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vProtocolAtts = new String[] { "src", "href" };
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vRemoveBlanks = new String[] { "a", "b", "strong", "i", "em" };
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vAllowedEntities = new String[] { "amp", "gt", "lt", "quot" };
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vSelfClosingTags = new String[]{"img"};
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vNeedClosingTags = new String[]{"a", "b", "strong", "i", "em"};
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vDisallowed = new String[]{};
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vAllowedProtocols = new String[]{"http", "mailto", "https"}; // no ftp.
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vProtocolAtts = new String[]{"src", "href"};
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vRemoveBlanks = new String[]{"a", "b", "strong", "i", "em"};
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vAllowedEntities = new String[]{"amp", "gt", "lt", "quot"};
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stripComment = true;
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encodeQuotes = true;
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alwaysMakeTags = false;
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@ -140,8 +136,7 @@ public final class HTMLFilter
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* @param conf map containing configuration. keys match field names.
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*/
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@SuppressWarnings("unchecked")
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public HTMLFilter(final Map<String, Object> conf)
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{
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public HtmlFilter(final Map<String, Object> conf) {
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assert conf.containsKey("vAllowed") : "configuration requires vAllowed";
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assert conf.containsKey("vSelfClosingTags") : "configuration requires vSelfClosingTags";
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@ -165,20 +160,22 @@ public final class HTMLFilter
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alwaysMakeTags = conf.containsKey("alwaysMakeTags") ? (Boolean) conf.get("alwaysMakeTags") : true;
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}
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private void reset()
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{
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private void reset() {
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vTagCounts.clear();
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}
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// ---------------------------------------------------------------
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// my versions of some PHP library functions
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public static String chr(final int decimal)
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{
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/**
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* my versions of some PHP library functions
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* @param decimal /
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* @return /
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*/
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public static String chr(final int decimal) {
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return String.valueOf((char) decimal);
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}
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public static String htmlSpecialChars(final String s)
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{
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public static String htmlSpecialChars(final String s) {
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String result = s;
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result = regexReplace(P_AMP, "&", result);
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result = regexReplace(P_QUOTE, """, result);
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@ -195,8 +192,7 @@ public final class HTMLFilter
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* @param input text (i.e. submitted by a user) than may contain html
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* @return "clean" version of input, with only valid, whitelisted html elements allowed
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*/
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public String filter(final String input)
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{
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public String filter(final String input) {
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reset();
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String s = input;
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@ -213,22 +209,18 @@ public final class HTMLFilter
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return s;
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}
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public boolean isAlwaysMakeTags()
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{
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public boolean isAlwaysMakeTags() {
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return alwaysMakeTags;
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}
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public boolean isStripComments()
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{
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public boolean isStripComments() {
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return stripComment;
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}
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private String escapeComments(final String s)
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{
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private String escapeComments(final String s) {
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final Matcher m = P_COMMENTS.matcher(s);
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final StringBuffer buf = new StringBuffer();
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if (m.find())
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{
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if (m.find()) {
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final String match = m.group(1); // (.*?)
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m.appendReplacement(buf, Matcher.quoteReplacement("<!--" + htmlSpecialChars(match) + "-->"));
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}
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@ -237,10 +229,8 @@ public final class HTMLFilter
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return buf.toString();
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}
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private String balancehtml(String s)
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{
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if (alwaysMakeTags)
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{
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private String balancehtml(String s) {
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if (alwaysMakeTags) {
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//
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// try and form html
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//
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@ -249,9 +239,7 @@ public final class HTMLFilter
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s = regexReplace(P_BODY_TO_END, "<$1>", s);
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s = regexReplace(P_XML_CONTENT, "$1<$2", s);
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}
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else
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{
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} else {
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//
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// escape stray brackets
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//
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@ -269,13 +257,11 @@ public final class HTMLFilter
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return s;
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}
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private String checkTags(String s)
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{
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private String checkTags(String s) {
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Matcher m = P_TAGS.matcher(s);
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final StringBuffer buf = new StringBuffer();
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while (m.find())
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{
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while (m.find()) {
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String replaceStr = m.group(1);
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replaceStr = processTag(replaceStr);
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m.appendReplacement(buf, Matcher.quoteReplacement(replaceStr));
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@ -285,10 +271,8 @@ public final class HTMLFilter
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// these get tallied in processTag
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// (remember to reset before subsequent calls to filter method)
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final StringBuilder sBuilder = new StringBuilder(buf.toString());
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for (String key : vTagCounts.keySet())
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{
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for (int ii = 0; ii < vTagCounts.get(key); ii++)
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{
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for (String key : vTagCounts.keySet()) {
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for (int ii = 0; ii < vTagCounts.get(key); ii++) {
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sBuilder.append("</").append(key).append(">");
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}
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}
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@ -297,18 +281,14 @@ public final class HTMLFilter
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return s;
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}
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private String processRemoveBlanks(final String s)
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{
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private String processRemoveBlanks(final String s) {
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String result = s;
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for (String tag : vRemoveBlanks)
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{
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if (!P_REMOVE_PAIR_BLANKS.containsKey(tag))
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{
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for (String tag : vRemoveBlanks) {
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if (!P_REMOVE_PAIR_BLANKS.containsKey(tag)) {
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P_REMOVE_PAIR_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?></" + tag + ">"));
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}
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result = regexReplace(P_REMOVE_PAIR_BLANKS.get(tag), "", result);
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if (!P_REMOVE_SELF_BLANKS.containsKey(tag))
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{
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if (!P_REMOVE_SELF_BLANKS.containsKey(tag)) {
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P_REMOVE_SELF_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?/>"));
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}
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result = regexReplace(P_REMOVE_SELF_BLANKS.get(tag), "", result);
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@ -317,136 +297,93 @@ public final class HTMLFilter
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return result;
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}
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private static String regexReplace(final Pattern regexPattern, final String replacement, final String s)
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{
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private static String regexReplace(final Pattern regexPattern, final String replacement, final String s) {
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Matcher m = regexPattern.matcher(s);
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return m.replaceAll(replacement);
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}
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private String processTag(final String s)
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{
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// ending tags
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private String processTag(final String s) {
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Matcher m = P_END_TAG.matcher(s);
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if (m.find())
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{
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if (m.find()) {
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final String name = m.group(1).toLowerCase();
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if (allowed(name))
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{
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if (false == inArray(name, vSelfClosingTags))
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{
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if (vTagCounts.containsKey(name))
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{
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if (allowed(name)) {
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if (false == inArray(name, vSelfClosingTags)) {
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if (vTagCounts.containsKey(name)) {
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vTagCounts.put(name, vTagCounts.get(name) - 1);
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return "</" + name + ">";
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}
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}
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}
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}
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// starting tags
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m = P_START_TAG.matcher(s);
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if (m.find())
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{
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if (m.find()) {
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final String name = m.group(1).toLowerCase();
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final String body = m.group(2);
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String ending = m.group(3);
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// debug( "in a starting tag, name='" + name + "'; body='" + body + "'; ending='" + ending + "'" );
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if (allowed(name))
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{
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if (allowed(name)) {
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final StringBuilder params = new StringBuilder();
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final Matcher m2 = P_QUOTED_ATTRIBUTES.matcher(body);
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final Matcher m3 = P_UNQUOTED_ATTRIBUTES.matcher(body);
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final List<String> paramNames = new ArrayList<>();
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final List<String> paramValues = new ArrayList<>();
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while (m2.find())
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{
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while (m2.find()) {
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paramNames.add(m2.group(1)); // ([a-z0-9]+)
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paramValues.add(m2.group(3)); // (.*?)
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}
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while (m3.find())
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{
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while (m3.find()) {
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paramNames.add(m3.group(1)); // ([a-z0-9]+)
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paramValues.add(m3.group(3)); // ([^\"\\s']+)
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}
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String paramName, paramValue;
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for (int ii = 0; ii < paramNames.size(); ii++)
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{
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for (int ii = 0; ii < paramNames.size(); ii++) {
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paramName = paramNames.get(ii).toLowerCase();
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paramValue = paramValues.get(ii);
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// debug( "paramName='" + paramName + "'" );
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// debug( "paramValue='" + paramValue + "'" );
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// debug( "allowed? " + vAllowed.get( name ).contains( paramName ) );
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if (allowedAttribute(name, paramName))
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{
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if (inArray(paramName, vProtocolAtts))
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{
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if (allowedAttribute(name, paramName)) {
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if (inArray(paramName, vProtocolAtts)) {
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paramValue = processParamProtocol(paramValue);
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}
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params.append(' ').append(paramName).append("=\\\"").append(paramValue).append("\"");
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}
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}
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if (inArray(name, vSelfClosingTags))
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{
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if (inArray(name, vSelfClosingTags)) {
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ending = " /";
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}
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if (inArray(name, vNeedClosingTags))
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{
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if (inArray(name, vNeedClosingTags)) {
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ending = "";
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}
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if (ending == null || ending.length() < 1)
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{
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if (vTagCounts.containsKey(name))
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{
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if (ending == null || ending.length() < 1) {
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if (vTagCounts.containsKey(name)) {
|
|
|
|
|
vTagCounts.put(name, vTagCounts.get(name) + 1);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
} else {
|
|
|
|
|
vTagCounts.put(name, 1);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
} else {
|
|
|
|
|
ending = " /";
|
|
|
|
|
}
|
|
|
|
|
return "<" + name + params + ending + ">";
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
} else {
|
|
|
|
|
return "";
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// comments
|
|
|
|
|
m = P_COMMENT.matcher(s);
|
|
|
|
|
if (!stripComment && m.find())
|
|
|
|
|
{
|
|
|
|
|
if (!stripComment && m.find()) {
|
|
|
|
|
return "<" + m.group() + ">";
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return "";
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private String processParamProtocol(String s)
|
|
|
|
|
{
|
|
|
|
|
private String processParamProtocol(String s) {
|
|
|
|
|
s = decodeEntities(s);
|
|
|
|
|
final Matcher m = P_PROTOCOL.matcher(s);
|
|
|
|
|
if (m.find())
|
|
|
|
|
{
|
|
|
|
|
if (m.find()) {
|
|
|
|
|
final String protocol = m.group(1);
|
|
|
|
|
if (!inArray(protocol, vAllowedProtocols))
|
|
|
|
|
{
|
|
|
|
|
if (!inArray(protocol, vAllowedProtocols)) {
|
|
|
|
|
// bad protocol, turn into local anchor link instead
|
|
|
|
|
s = "#" + s.substring(protocol.length() + 1);
|
|
|
|
|
if (s.startsWith("#//"))
|
|
|
|
|
{
|
|
|
|
|
if (s.startsWith("#//")) {
|
|
|
|
|
s = "#" + s.substring(3);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
@ -455,13 +392,11 @@ public final class HTMLFilter
|
|
|
|
|
return s;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private String decodeEntities(String s)
|
|
|
|
|
{
|
|
|
|
|
private String decodeEntities(String s) {
|
|
|
|
|
StringBuffer buf = new StringBuffer();
|
|
|
|
|
|
|
|
|
|
Matcher m = P_ENTITY.matcher(s);
|
|
|
|
|
while (m.find())
|
|
|
|
|
{
|
|
|
|
|
while (m.find()) {
|
|
|
|
|
final String match = m.group(1);
|
|
|
|
|
final int decimal = Integer.decode(match).intValue();
|
|
|
|
|
m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
|
|
|
|
|
@ -471,8 +406,7 @@ public final class HTMLFilter
|
|
|
|
|
|
|
|
|
|
buf = new StringBuffer();
|
|
|
|
|
m = P_ENTITY_UNICODE.matcher(s);
|
|
|
|
|
while (m.find())
|
|
|
|
|
{
|
|
|
|
|
while (m.find()) {
|
|
|
|
|
final String match = m.group(1);
|
|
|
|
|
final int decimal = Integer.valueOf(match, 16).intValue();
|
|
|
|
|
m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
|
|
|
|
|
@ -482,8 +416,7 @@ public final class HTMLFilter
|
|
|
|
|
|
|
|
|
|
buf = new StringBuffer();
|
|
|
|
|
m = P_ENCODE.matcher(s);
|
|
|
|
|
while (m.find())
|
|
|
|
|
{
|
|
|
|
|
while (m.find()) {
|
|
|
|
|
final String match = m.group(1);
|
|
|
|
|
final int decimal = Integer.valueOf(match, 16).intValue();
|
|
|
|
|
m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
|
|
|
|
|
@ -495,14 +428,12 @@ public final class HTMLFilter
|
|
|
|
|
return s;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private String validateEntities(final String 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())
|
|
|
|
|
{
|
|
|
|
|
while (m.find()) {
|
|
|
|
|
final String one = m.group(1); // ([^&;]*)
|
|
|
|
|
final String two = m.group(2); // (?=(;|&|$))
|
|
|
|
|
m.appendReplacement(buf, Matcher.quoteReplacement(checkEntity(one, two)));
|
|
|
|
|
@ -512,14 +443,11 @@ public final class HTMLFilter
|
|
|
|
|
return encodeQuotes(buf.toString());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private String encodeQuotes(final String s)
|
|
|
|
|
{
|
|
|
|
|
if (encodeQuotes)
|
|
|
|
|
{
|
|
|
|
|
private String encodeQuotes(final String s) {
|
|
|
|
|
if (encodeQuotes) {
|
|
|
|
|
StringBuffer buf = new StringBuffer();
|
|
|
|
|
Matcher m = P_VALID_QUOTES.matcher(s);
|
|
|
|
|
while (m.find())
|
|
|
|
|
{
|
|
|
|
|
while (m.find()) {
|
|
|
|
|
final String one = m.group(1); // (>|^)
|
|
|
|
|
final String two = m.group(2); // ([^<]+?)
|
|
|
|
|
final String three = m.group(3); // (<|$)
|
|
|
|
|
@ -528,43 +456,34 @@ public final class HTMLFilter
|
|
|
|
|
}
|
|
|
|
|
m.appendTail(buf);
|
|
|
|
|
return buf.toString();
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
} else {
|
|
|
|
|
return s;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private String checkEntity(final String preamble, final String term)
|
|
|
|
|
{
|
|
|
|
|
private String checkEntity(final String preamble, final String term) {
|
|
|
|
|
|
|
|
|
|
return ";".equals(term) && isValidEntity(preamble) ? '&' + preamble : "&" + preamble;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private boolean isValidEntity(final String entity)
|
|
|
|
|
{
|
|
|
|
|
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))
|
|
|
|
|
{
|
|
|
|
|
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)
|
|
|
|
|
{
|
|
|
|
|
private boolean allowed(final String name) {
|
|
|
|
|
return (vAllowed.isEmpty() || vAllowed.containsKey(name)) && !inArray(name, vDisallowed);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private boolean allowedAttribute(final String name, final String paramName)
|
|
|
|
|
{
|
|
|
|
|
private boolean allowedAttribute(final String name, final String paramName) {
|
|
|
|
|
return allowed(name) && (vAllowed.isEmpty() || vAllowed.get(name).contains(paramName));
|
|
|
|
|
}
|
|
|
|
|
}
|
1332987
3 years ago