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| 1 | +package net.authorize.util; |
| 2 | + |
| 3 | +import java.io.BufferedReader; |
| 4 | +import java.io.FileNotFoundException; |
| 5 | +import java.io.IOException; |
| 6 | +import java.io.InputStream; |
| 7 | +import java.io.InputStreamReader; |
| 8 | +import java.io.UnsupportedEncodingException; |
| 9 | +import java.util.regex.Pattern; |
| 10 | + |
| 11 | +import org.apache.log4j.PatternLayout; |
| 12 | +import org.apache.log4j.spi.LoggingEvent; |
| 13 | +import org.apache.log4j.Logger; |
| 14 | + |
| 15 | +import com.google.gson.Gson; |
| 16 | +import com.google.gson.GsonBuilder; |
| 17 | + |
| 18 | +public class SensitiveFilterLayout extends PatternLayout{ |
| 19 | + |
| 20 | + private static Pattern[] cardPatterns; |
| 21 | + |
| 22 | + private static Pattern[] tagPatterns; |
| 23 | + private static String[] tagReplacements; |
| 24 | + private static Gson gson; |
| 25 | + |
| 26 | + public SensitiveFilterLayout() throws UnsupportedEncodingException, FileNotFoundException, IOException { |
| 27 | + GsonBuilder gsonBuilder = new GsonBuilder(); |
| 28 | + gsonBuilder.registerTypeAdapter(SensitiveDataConfigType.class, new SensitiveTagsDeserializer()); |
| 29 | + gson = gsonBuilder.create(); |
| 30 | + |
| 31 | + InputStream in = getClass().getResourceAsStream("/AuthorizedNetSensitiveTagsConfig.json"); |
| 32 | + BufferedReader reader = new BufferedReader(new InputStreamReader(in)); |
| 33 | + SensitiveDataConfigType configType = gson.fromJson(reader, SensitiveDataConfigType.class); |
| 34 | + cardPatterns = new Pattern[configType.sensitiveStringRegexes.length]; |
| 35 | + |
| 36 | + for(int i = 0; i < configType.sensitiveStringRegexes.length; i++) { |
| 37 | + cardPatterns[i] = Pattern.compile(configType.sensitiveStringRegexes[i]); |
| 38 | + } |
| 39 | + |
| 40 | + int noOfSensitiveTags = configType.sensitiveTags.length; |
| 41 | + tagPatterns = new Pattern[noOfSensitiveTags]; |
| 42 | + tagReplacements = new String[noOfSensitiveTags]; |
| 43 | + |
| 44 | + for(int j=0; j<noOfSensitiveTags; j++) { |
| 45 | + String tagName = configType.sensitiveTags[j].tagName; |
| 46 | + String pattern = configType.sensitiveTags[j].pattern; |
| 47 | + String replacement = configType.sensitiveTags[j].replacement; |
| 48 | + |
| 49 | + if(pattern != null && !pattern.isEmpty()) |
| 50 | + tagPatterns[j] = Pattern.compile("<"+tagName+">"+pattern+"</"+tagName+">"); |
| 51 | + else |
| 52 | + tagPatterns[j] = Pattern.compile("<"+tagName+">"+".+"+"</"+tagName+">"); |
| 53 | + tagReplacements[j] = "<"+tagName+">"+replacement+"</"+tagName+">"; |
| 54 | + } |
| 55 | + if(reader!=null) |
| 56 | + reader.close(); |
| 57 | + } |
| 58 | + |
| 59 | + @Override |
| 60 | + public String format(LoggingEvent event) { |
| 61 | + if(event.getMessage() instanceof String) { |
| 62 | + String message = event.getRenderedMessage(); |
| 63 | + String maskXmlMessage = SensitiveFilterLayout.maskSensitiveXmlString(message); |
| 64 | + String maskCardNumber = SensitiveFilterLayout.maskCreditCards(maskXmlMessage); |
| 65 | + |
| 66 | + Throwable throwable = event.getThrowableInformation() != null ? event.getThrowableInformation().getThrowable() : null; |
| 67 | + LoggingEvent maskedEvent = new LoggingEvent(event.fqnOfCategoryClass, Logger.getLogger(event.getLoggerName()), event.timeStamp, event.getLevel(), maskCardNumber, throwable); |
| 68 | + return super.format(maskedEvent); |
| 69 | + } |
| 70 | + return null; |
| 71 | + } |
| 72 | + |
| 73 | + public static String maskCreditCards(String str) { |
| 74 | + for (int i = 0; i < cardPatterns.length; i++) { |
| 75 | + str = cardPatterns[i].matcher(str).replaceAll("XXXX"); |
| 76 | + } |
| 77 | + return str; |
| 78 | + } |
| 79 | + |
| 80 | + public static String maskSensitiveXmlString(String str) { |
| 81 | + for (int i = 0; i < tagPatterns.length; i++) { |
| 82 | + str = tagPatterns[i].matcher(str).replaceAll(tagReplacements[i]); |
| 83 | + } |
| 84 | + return str; |
| 85 | + } |
| 86 | +} |
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