package org.apache.logging.log4j.core.filter;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.Comparator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.Logger;
import org.apache.logging.log4j.core.config.Node;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.message.Message;
@Plugin(name = "RegexFilter", category = Node.CATEGORY, elementType = Filter.ELEMENT_TYPE, printObject = true)
public final class RegexFilter extends AbstractFilter {
private static final int DEFAULT_PATTERN_FLAGS = 0;
private final Pattern pattern;
private final boolean useRawMessage;
private RegexFilter(final boolean raw, final Pattern pattern, final Result onMatch, final Result onMismatch) {
super(onMatch, onMismatch);
this.pattern = pattern;
this.useRawMessage = raw;
}
@Override
public Result filter(final Logger logger, final Level level, final Marker marker, final String msg,
final Object... params) {
return filter(msg);
}
@Override
public Result filter(final Logger logger, final Level level, final Marker marker, final Object msg,
final Throwable t) {
if (msg == null) {
return onMismatch;
}
return filter(msg.toString());
}
@Override
public Result filter(final Logger logger, final Level level, final Marker marker, final Message msg,
final Throwable t) {
if (msg == null) {
return onMismatch;
}
final String text = useRawMessage ? msg.getFormat() : msg.getFormattedMessage();
return filter(text);
}
@Override
public Result filter(final LogEvent event) {
final String text = useRawMessage ? event.getMessage().getFormat() : event.getMessage().getFormattedMessage();
return filter(text);
}
private Result filter(final String msg) {
if (msg == null) {
return onMismatch;
}
final Matcher m = pattern.matcher(msg);
return m.matches() ? onMatch : onMismatch;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("useRaw=").append(useRawMessage);
sb.append(", pattern=").append(pattern.toString());
return sb.toString();
}
@PluginFactory
public static RegexFilter createFilter(
@PluginAttribute("regex") final String regex,
@PluginElement("PatternFlags") final String[] patternFlags,
@PluginAttribute("useRawMsg") final Boolean useRawMsg,
@PluginAttribute("onMatch") final Result match,
@PluginAttribute("onMismatch") final Result mismatch)
throws IllegalArgumentException, IllegalAccessException {
if (regex == null) {
LOGGER.error("A regular expression must be provided for RegexFilter");
return null;
}
return new RegexFilter(useRawMsg, Pattern.compile(regex, toPatternFlags(patternFlags)), match, mismatch);
}
private static int toPatternFlags(final String[] patternFlags) throws IllegalArgumentException,
IllegalAccessException {
if (patternFlags == null || patternFlags.length == 0) {
return DEFAULT_PATTERN_FLAGS;
}
final Field[] fields = Pattern.class.getDeclaredFields();
final Comparator<Field> comparator = new Comparator<Field>() {
@Override
public int compare(final Field f1, final Field f2) {
return f1.getName().compareTo(f2.getName());
}
};
Arrays.sort(fields, comparator);
final String[] fieldNames = new String[fields.length];
for (int i = 0; i < fields.length; i++) {
fieldNames[i] = fields[i].getName();
}
int flags = DEFAULT_PATTERN_FLAGS;
for (final String test : patternFlags) {
final int index = Arrays.binarySearch(fieldNames, test);
if (index >= 0) {
final Field field = fields[index];
flags |= field.getInt(Pattern.class);
}
}
return flags;
}
}