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LogCensor.scala
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Sun, Sep 8, 08:23

LogCensor.scala
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package net.shrine.log
/**
* Censors out things inappropriate for logs, such as i2b2's password element.
*
* @author david
* @since 8/4/15
*/
object LogCensor {
/**
* Matches for things like
* <password is_token="false" token_ms_timeout="1800000">kapow</password>
*/
val i2b2PasswordRegex = """(<password.*>).*(</password>)""".r
/**
* Matches Base64 strings.
* From http://stackoverflow.com/questions/475074/regex-to-parse-or-validate-base64-data .
*/
val base64String = """(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?"""
/**
* Matches for things like
*
* Authorization: Basic cWVwOnRydXN0bWU=, and Authorization: Basic cWVwOnRydXN0bWU=)
*/
val basicAuthRegex = s"""(Authorization: Basic )$base64String([,)].*)""".r
//todo match and replace basic auth in headers
def censor(target:String):String = {
val noIb2Passwords = i2b2PasswordRegex.replaceAllIn(target,"$1REDACTED$2")
basicAuthRegex.replaceAllIn(noIb2Passwords,"$1REDACTED$2")
}
}
import org.apache.log4j.PatternLayout
import org.apache.log4j.helpers.PatternParser
import org.apache.log4j.pattern.{FormattingInfo, LiteralPatternConverter, LoggingEventPatternConverter, PatternConverter}
import org.apache.log4j.spi.LoggingEvent
class PasswordCensorMessagePatternConverter extends LoggingEventPatternConverter("PasswordCensorMessage","noPasswordsInMessage") {
override def format(event: LoggingEvent, toAppendTo: StringBuffer): Unit = {
val message = LogCensor.censor(event.getRenderedMessage)
toAppendTo.append(message)
}
override def handlesThrowable = true
}
object PasswordCensorMessagePatternConverter {
def newInstance(options:Array[String]):PasswordCensorMessagePatternConverter = new PasswordCensorMessagePatternConverter
}
class PasswordCensorThrowablePatternConverter extends LoggingEventPatternConverter("PasswordCensorThrowable","noPasswordsInThrowable") {
override def format(event: LoggingEvent, toAppendTo: StringBuffer): Unit = {
val throwableInformation = Option(event.getThrowableInformation)
throwableInformation.fold(()){information =>
val strings: Array[String] = information.getThrowableStrRep
strings.map(LogCensor.censor).foreach(toAppendTo.append(_).append("\n"))
}
}
override def handlesThrowable = true
}
object PasswordCensorThrowablePatternConverter {
def newInstance(options:Array[String]):PasswordCensorThrowablePatternConverter = new PasswordCensorThrowablePatternConverter
}
/**
* A custom PatternConverter based on BridgePatternConverter to replace the message and throwable sections of pattern.PatternParser
*
*/
class CustomPatternConverter(pattern:String) extends org.apache.log4j.helpers.PatternConverter {
import java.util.ArrayList
import org.apache.log4j.pattern.{PatternParser => ConverterSelector}
import scala.collection.JavaConverters.{collectionAsScalaIterableConverter, mapAsJavaMapConverter}
val converterRegistry = {
val customRules = Map("m" -> classOf[PasswordCensorMessagePatternConverter],
"message" -> classOf[PasswordCensorMessagePatternConverter],
"throwable" -> classOf[PasswordCensorThrowablePatternConverter]
)
customRules.asJava
}
val converters = new ArrayList[PatternConverter]()
val fields = new ArrayList[FormattingInfo]()
//parse() fills up converters and fields based on the pattern. Very 1999
ConverterSelector.parse(pattern,converters,fields,converterRegistry,ConverterSelector.getPatternLayoutRules)
val patternConverters: Array[PatternConverter] = converters.asScala.map{
case lepc:LoggingEventPatternConverter => lepc
case _ => new LiteralPatternConverter("")
}.toArray[PatternConverter]
val patternFields: Array[FormattingInfo] = fields.asScala.toArray.padTo(patternConverters.length,FormattingInfo.getDefault)
val handlesExceptions = true
val convertersAndFields = patternConverters.zip(patternFields)
protected def convert(event: LoggingEvent): String = {
val sbuf: StringBuffer = new StringBuffer
format(sbuf, event)
sbuf.toString
}
override def format(sbuf: StringBuffer, e: LoggingEvent):Unit = {
convertersAndFields.foreach{ converterAndField =>
val startField = sbuf.length()
converterAndField._1.format(e,sbuf)
converterAndField._2.format(startField,sbuf)
}
}
def ignoresThrowable: Boolean = {
!handlesExceptions
}
}
class CustomPatternParser(pattern:String) extends PatternParser(pattern) {
override def parse = new CustomPatternConverter(pattern)
}
class CustomPatternLayout extends PatternLayout {
protected override def createPatternParser(pattern:String):PatternParser = new CustomPatternParser(pattern)
override def ignoresThrowable(): Boolean = false
override def activateOptions(): Unit = {}
}

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