net.duckling.falcon.xss.JSONConfig.java Source code

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Here is the source code for net.duckling.falcon.xss.JSONConfig.java

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/*
 * Copyright (c) 2008-2016 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 * 
 * This file is part of Duckling project.
 *
 * 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.duckling.falcon.xss;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import org.jsoup.safety.Whitelist;

class JSONConfig {
    public static Whitelist parse(String filename) throws IOException, ParseException {
        String jsonString = FileUtils.readFileToString(new File(filename), "UTF-8");
        JSONParser parser = new JSONParser();
        Object obj = parser.parse(jsonString);
        if (obj instanceof JSONObject) {
            Whitelist whitelist = new Whitelist();
            JSONObject config = (JSONObject) obj;
            addTags(whitelist, config);
            addProtocols(whitelist, config);
            return whitelist;
        }
        return Whitelist.none();
    }

    private static void addProtocols(Whitelist whitelist, JSONObject config) {
        JSONObject protocolsJson = (JSONObject) config.get("protocols");
        for (String key : protocolsJson.keySet()) {
            String[] pair = key.split("\\.");
            if (pair.length == 2) {
                JSONArray protocols = (JSONArray) protocolsJson.get(key);
                for (Object p : protocols) {
                    whitelist.addProtocols(pair[0], pair[1], (String) p);
                }
            }
        }
    }

    private static void addTags(Whitelist whitelist, JSONObject config) {
        JSONObject whiteListJson = (JSONObject) config.get("whiteList");
        for (String tagname : whiteListJson.keySet()) {
            whitelist.addTags(tagname);
            JSONArray attributes = (JSONArray) whiteListJson.get(tagname);
            for (Object attribute : attributes) {
                whitelist.addAttributes(tagname, (String) attribute);
            }
        }
    }
}