io.dataapps.chlorine.mask.Redactor.java Source code

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Here is the source code for io.dataapps.chlorine.mask.Redactor.java

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/*
 * Copyright 2016, DataApps Corporation (http://dataApps.io) .
 * 
 * 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 io.dataapps.chlorine.mask;

import io.dataapps.chlorine.finder.Finder;
import io.dataapps.chlorine.finder.FinderEngine;
import io.dataapps.chlorine.finder.FinderResult;
import io.dataapps.chlorine.pattern.FinderUtil;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Implements the Masker.
 * Accepts a replacement string for each finder element.
 * Detects the data using the FinderEngine.
 * Substitutes any element detected by the finder using 
 * the replacement text. 
 * If the Finder implements Replacer, then it invokes
 * replace on the Finder.
 */

public class Redactor implements Masker {
    private static final Log LOG = LogFactory.getLog(Redactor.class);

    Map<String, String> replacements;
    FinderEngine engine;

    public void init(FinderEngine engine, Map<String, String> replacements) {
        this.engine = engine;
        this.replacements = replacements;
    }

    public void init(FinderEngine engine, String configurationFileName) {
        init(engine, readReplacements(configurationFileName));
    }

    private static Map<String, String> readReplacements(String configurationFileName) {
        Properties properties = new Properties();
        Map<String, String> map = new HashMap<>();
        try (final InputStream stream = MaskFactory.class.getClassLoader()
                .getResourceAsStream(configurationFileName)) {
            properties.load(stream);
            for (final String name : properties.stringPropertyNames()) {
                map.put(name, properties.getProperty(name));
            }
        } catch (IOException e) {
            LOG.error(e);
        }
        return map;
    }

    @Override
    public String mask(String input) {
        String temp = input;
        String masked = input;
        List<Finder> finders = engine.getFinders();
        for (Finder finder : finders) {
            String replacement = replacements.get(finder.getName());
            if (replacement != null) {
                FinderResult result = finder.find(temp);
                masked = FinderUtil.replaceMatches(masked, result.getMatches(), replacement);
                temp = result.getMatchesRemoved();
            }
        }
        return masked;
    }

    public Map<String, String> getReplacements() {
        return replacements;
    }

    public void setReplacements(Map<String, String> replacements) {
        this.replacements = replacements;
    }

    public FinderEngine getEngine() {
        return engine;
    }

    public void setEngine(FinderEngine engine) {
        this.engine = engine;
    }

}