com.switchfly.inputvalidation.canonicalizer.HtmlAndQueryStringCanonicalizer.java Source code

Introduction

Here is the source code for com.switchfly.inputvalidation.canonicalizer.HtmlAndQueryStringCanonicalizer.java

Source

/*
 * Copyright 2012 Switchfly
 *
 * 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 com.switchfly.inputvalidation.canonicalizer;

import java.net.URLDecoder;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.commons.lang.StringUtils;

/**
 * Canonicalize content to decomposed Unicode. Decode HTML and URL entities.
 */
public class HtmlAndQueryStringCanonicalizer extends StringCanonicalizer {

    @Override
    public String execute(String content) {
        if (StringUtils.isBlank(content)) {
            return content;
        }
        String s = super.execute(content);
        try {
            s = StringEscapeUtils.unescapeHtml(s);
        } catch (Exception e) {
            throw new IllegalArgumentException("Canonicalization error", e);
        }
        try {
            s = URLDecoder.decode(s, "UTF-8");
        } catch (Exception e) {
            // ignore and move on
        }
        return s;
    }
}