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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.common.util;
import org.apache.commons.lang3.StringEscapeUtils;
import javax.swing.text.html.HTML;
import javax.swing.text.html.HTML.Tag;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class HtmlCleaner {
private static Set<String> htmlTags = new HashSet<>();
private static String patternHtmlFullTagStr = "</?\\w+((\\s+\\w+(\\s*=\\s*(?:\".*?\"|'.*?'|[\\^'\">\\s]+))?)+\\s*|\\s*)/?>";
private static String patternHtmlTagOnlyStr = "</?(\\w+)[^>]*/?>";
private static Pattern onlyTagPattern = Pattern.compile(patternHtmlTagOnlyStr);
private static Pattern fullTagPattern = Pattern.compile(patternHtmlFullTagStr);
static {
Tag[] allTags = HTML.getAllTags();
for (Tag tag : allTags) {
htmlTags.add(tag.toString().toLowerCase());
}
}
public static String stripHtml(String input) {
return stripHtml(input, false);
}
public static String stripHtml(String input, boolean toEscape) {
if (input == null || input.isEmpty()) {
return input;
}
Matcher matcher = onlyTagPattern.matcher(input);
Set<String> tagsToRemove = new HashSet<>();
while (matcher.find()) {
int start = matcher.start();
int end = matcher.end();
String matchTag = input.substring(start, end);
int groupCount = matcher.groupCount();
if (groupCount > 0) {
String tag = matcher.group(1);
if (tag != null && htmlTags.contains(tag.toLowerCase())) {
if (!tagsToRemove.contains(matchTag)) {
tagsToRemove.add(matchTag);
}
}
}
}
String stripHtmlStr = removeTagsFromString(tagsToRemove, input);
if (stripHtmlStr != null) {
if (toEscape) {
stripHtmlStr = StringEscapeUtils.escapeHtml4(stripHtmlStr);
}
}
return stripHtmlStr;
}
private static String removeTagsFromString(Set<String> tagsToRemove, String input) {
String stripStr = input;
if (input == null || tagsToRemove.isEmpty()) {
return input;
}
for (String tag : tagsToRemove) {
stripStr = stripStr.replaceAll(tag, "");
}
return stripStr;
}
}
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