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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.logging.log4j.core.layout;
import java.nio.charset.Charset;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
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.PluginFactory;
import org.apache.logging.log4j.core.net.Facility;
import org.apache.logging.log4j.core.net.Priority;
import org.apache.logging.log4j.core.util.NetUtils;
import org.apache.logging.log4j.util.Chars;
/**
* Formats a log event as a BSD Log record.
*/
@Plugin(name = "SyslogLayout", category = Node.CATEGORY, elementType = Layout.ELEMENT_TYPE, printObject = true)
public final class SyslogLayout extends AbstractStringLayout {
/**
* Match newlines in a platform-independent manner.
*/
public static final Pattern NEWLINE_PATTERN = Pattern.compile("\\r?\\n");
private final Facility facility;
private final boolean includeNewLine;
private final String escapeNewLine;
/**
* Date format used if header = true.
*/
private final SimpleDateFormat dateFormat = new SimpleDateFormat("MMM dd HH:mm:ss", Locale.ENGLISH);
/**
* Host name used to identify messages from this appender.
*/
private final String localHostname = NetUtils.getLocalHostname();
protected SyslogLayout(final Facility facility, final boolean includeNL, final String escapeNL, final Charset charset) {
super(charset);
this.facility = facility;
this.includeNewLine = includeNL;
this.escapeNewLine = escapeNL == null ? null : Matcher.quoteReplacement(escapeNL);
}
/**
* Formats a {@link org.apache.logging.log4j.core.LogEvent} in conformance with the BSD Log record format.
*
* @param event The LogEvent
* @return the event formatted as a String.
*/
@Override
public String toSerializable(final LogEvent event) {
final StringBuilder buf = getStringBuilder();
buf.append('<');
buf.append(Priority.getPriority(facility, event.getLevel()));
buf.append('>');
addDate(event.getTimeMillis(), buf);
buf.append(Chars.SPACE);
buf.append(localHostname);
buf.append(Chars.SPACE);
String message = event.getMessage().getFormattedMessage();
if (null != escapeNewLine) {
message = NEWLINE_PATTERN.matcher(message).replaceAll(escapeNewLine);
}
buf.append(message);
if (includeNewLine) {
buf.append('\n');
}
return buf.toString();
}
private synchronized void addDate(final long timestamp, final StringBuilder buf) {
final int index = buf.length() + 4;
buf.append(dateFormat.format(new Date(timestamp)));
// RFC 3164 says leading space, not leading zero on days 1-9
if (buf.charAt(index) == '0') {
buf.setCharAt(index, Chars.SPACE);
}
}
/**
* Gets this SyslogLayout's content format. Specified by:
*
Key: "formatType" Value: "logfilepatternreceiver" (format uses the keywords supported by
* LogFilePatternReceiver)
*
*
* @return Map of content format keys supporting SyslogLayout
*/
@Override
public Map getContentFormat() {
final Map result = new HashMap<>();
result.put("structured", "false");
result.put("formatType", "logfilepatternreceiver");
result.put("dateFormat", dateFormat.toPattern());
result.put("format", "TIMESTAMP PROP(HOSTNAME) MESSAGE");
return result;
}
/**
* Create a SyslogLayout.
* @param facility The Facility is used to try to classify the message.
* @param includeNewLine If true a newline will be appended to the result.
* @param escapeNL Pattern to use for replacing newlines.
* @param charset The character set.
* @return A SyslogLayout.
*/
@PluginFactory
public static SyslogLayout createLayout(
@PluginAttribute(value = "facility", defaultString = "LOCAL0") final Facility facility,
@PluginAttribute(value = "newLine", defaultBoolean = false) final boolean includeNewLine,
@PluginAttribute("newLineEscape") final String escapeNL,
@PluginAttribute(value = "charset", defaultString = "UTF-8") final Charset charset) {
return new SyslogLayout(facility, includeNewLine, escapeNL, charset);
}
}