/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.undertow.server.handlers.accesslog;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import io.undertow.attribute.ExchangeAttribute;
import io.undertow.attribute.ExchangeAttributes;
import io.undertow.attribute.SubstituteEmptyWrapper;
import io.undertow.predicate.Predicate;
import io.undertow.predicate.Predicates;
import io.undertow.server.ExchangeCompletionListener;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.builder.HandlerBuilder;
/**
* Access log handler. This handler will generate access log messages based on the provided format string,
* and pass these messages into the provided {@link AccessLogReceiver}.
* <p>
* This handler can log any attribute that is provides via the {@link io.undertow.attribute.ExchangeAttribute}
* mechanism. A general guide to the most common attribute is provided before, however this mechanism is extensible.
* <p>
* <p>
* <p>This factory produces token handlers for the following patterns</p>
* <ul>
* <li><b>%a</b> - Remote IP address
* <li><b>%A</b> - Local IP address
* <li><b>%b</b> - Bytes sent, excluding HTTP headers, or '-' if no bytes
* were sent
* <li><b>%B</b> - Bytes sent, excluding HTTP headers
* <li><b>%h</b> - Remote host name
* <li><b>%H</b> - Request protocol
* <li><b>%l</b> - Remote logical username from identd (always returns '-')
* <li><b>%m</b> - Request method
* <li><b>%p</b> - Local port
* <li><b>%q</b> - Query string (excluding the '?' character)
* <li><b>%r</b> - First line of the request
* <li><b>%s</b> - HTTP status code of the response
* <li><b>%t</b> - Date and time, in Common Log Format format
* <li><b>%u</b> - Remote user that was authenticated
* <li><b>%U</b> - Requested URL path
* <li><b>%v</b> - Local server name
* <li><b>%D</b> - Time taken to process the request, in millis
* <li><b>%T</b> - Time taken to process the request, in seconds
* <li><b>%I</b> - current Request thread name (can compare later with stacktraces)
* </ul>
* <p>In addition, the caller can specify one of the following aliases for
* commonly utilized patterns:</p>
* <ul>
* <li><b>common</b> - <code>%h %l %u %t "%r" %s %b</code>
* <li><b>combined</b> -
* <code>%h %l %u %t "%r" %s %b "%{i,Referer}" "%{i,User-Agent}"</code>
* </ul>
* <p>
* <p>
* There is also support to write information from the cookie, incoming
* header, or the session<br>
* It is modeled after the apache syntax:
* <ul>
* <li><code>%{i,xxx}</code> for incoming headers
* <li><code>%{o,xxx}</code> for outgoing response headers
* <li><code>%{c,xxx}</code> for a specific cookie
* <li><code>%{r,xxx}</code> xxx is an attribute in the ServletRequest
* <li><code>%{s,xxx}</code> xxx is an attribute in the HttpSession
* </ul>
*
* @author Stuart Douglas
*/
public class AccessLogHandler implements HttpHandler {
private final HttpHandler next;
private final AccessLogReceiver accessLogReceiver;
private final String formatString;
private final ExchangeAttribute tokens;
private final ExchangeCompletionListener exchangeCompletionListener = new AccessLogCompletionListener();
private final Predicate predicate;
public AccessLogHandler(final HttpHandler next, final AccessLogReceiver accessLogReceiver, final String formatString, ClassLoader classLoader) {
this(next, accessLogReceiver, formatString, classLoader, Predicates.truePredicate());
}
public AccessLogHandler(final HttpHandler next, final AccessLogReceiver accessLogReceiver, final String formatString, ClassLoader classLoader, Predicate predicate) {
this.next = next;
this.accessLogReceiver = accessLogReceiver;
this.predicate = predicate;
this.formatString = handleCommonNames(formatString);
this.tokens = ExchangeAttributes.parser(classLoader, new SubstituteEmptyWrapper("-")).parse(this.formatString);
}
public AccessLogHandler(final HttpHandler next, final AccessLogReceiver accessLogReceiver, String formatString, final ExchangeAttribute attribute) {
this(next, accessLogReceiver, formatString, attribute, Predicates.truePredicate());
}
public AccessLogHandler(final HttpHandler next, final AccessLogReceiver accessLogReceiver, String formatString, final ExchangeAttribute attribute, Predicate predicate) {
this.next = next;
this.accessLogReceiver = accessLogReceiver;
this.predicate = predicate;
this.formatString = handleCommonNames(formatString);
this.tokens = attribute;
}
private static String handleCommonNames(String formatString) {
if(formatString.equals("common")) {
return "%h %l %u %t \"%r\" %s %b";
} else if (formatString.equals("combined")) {
return "%h %l %u %t \"%r\" %s %b \"%{i,Referer}\" \"%{i,User-Agent}\"";
}
return formatString;
}
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
exchange.addExchangeCompleteListener(exchangeCompletionListener);
next.handleRequest(exchange);
}
private class AccessLogCompletionListener implements ExchangeCompletionListener {
@Override
public void exchangeEvent(final HttpServerExchange exchange, final NextListener nextListener) {
try {
if(predicate == null || predicate.resolve(exchange)) {
accessLogReceiver.logMessage(tokens.readAttribute(exchange));
}
} finally {
nextListener.proceed();
}
}
}
@Override
public String toString() {
return "AccessLogHandler{" +
"formatString='" + formatString + '\'' +
'}';
}
public static class Builder implements HandlerBuilder {
@Override
public String name() {
return "access-log";
}
@Override
public Map<String, Class<?>> parameters() {
return Collections.<String, Class<?>>singletonMap("format", String.class);
}
@Override
public Set<String> requiredParameters() {
return Collections.singleton("format");
}
@Override
public String defaultParameter() {
return "format";
}
@Override
public HandlerWrapper build(Map<String, Object> config) {
return new Wrapper((String) config.get("format"));
}
}
private static class Wrapper implements HandlerWrapper {
private final String format;
private Wrapper(String format) {
this.format = format;
}
@Override
public HttpHandler wrap(HttpHandler handler) {
return new AccessLogHandler(handler, new JBossLoggingAccessLogReceiver(), format, Wrapper.class.getClassLoader());
}
}
}