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LogViewer.java
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LogViewer.java
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/*
* Copyright 2011-2022 the original author or authors.
*
* 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 org.appng.application.manager.business.webservice;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Properties;
import java.util.regex.Pattern;
import org.apache.commons.lang3.StringUtils;
import org.appng.api.BusinessException;
import org.appng.api.Environment;
import org.appng.api.Platform;
import org.appng.api.Request;
import org.appng.api.Webservice;
import org.appng.api.model.Application;
import org.appng.api.model.Site;
import org.appng.api.model.Subject;
import org.appng.application.manager.business.LogConfig;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
/**
* A {@link Webservice} for displaying the current logfile.<br/>
* Usage:<br/>
* http://localhost:8080/service/appng/appng-manager/webservice/logViewer<br/>
* limit lines:<br/>
* http://localhost:8080/service/appng/appng-manager/webservice/logViewer?lines=100
*
* @author Matthias Müller
*/
@Component
public class LogViewer implements Webservice, InitializingBean {
private static final String WEBAPP_ROOT = "${webapp.root}";
private static final String APPNG_APPENDER = "log4j.appender.appng.File";
protected static final String PERM_LOG_VIEWER = "platform.logfile";
@Value("${platform." + Platform.Property.PLATFORM_ROOT_PATH + "}")
private String rootPath;
private String logFileLocation;
public void afterPropertiesSet() throws Exception {
try (InputStream propsIs = new FileInputStream(new File(rootPath, LogConfig.LOG4J_PROPS))) {
Properties log4jProps = new Properties();
log4jProps.load(propsIs);
logFileLocation = log4jProps.getProperty(APPNG_APPENDER);
logFileLocation = logFileLocation.replace(WEBAPP_ROOT, rootPath);
}
}
public byte[] processRequest(Site site, Application application, Environment environment, Request request)
throws BusinessException {
StringBuilder result = new StringBuilder();
Subject subject = environment.getSubject();
if (subject != null && subject.isAuthenticated()
&& request.getPermissionProcessor().hasPermission(PERM_LOG_VIEWER)) {
File logFile = getLogfile();
int maxLines = 1000;
String parameter = request.getParameter("lines");
String find = request.getParameter("find");
Pattern pattern = StringUtils.isBlank(find) ? null : Pattern.compile(find);
if (null != parameter && parameter.matches("\\d+")) {
maxLines = Integer.parseInt(parameter);
}
try {
Iterator<String> lines = new FastAccessFile(logFile).tail(maxLines - 1);
while (lines.hasNext()) {
String line = lines.next();
if (null == pattern || pattern.matcher(line).find()) {
result.append(line);
if (lines.hasNext()) {
result.append(FastAccessFile.LF);
}
}
}
} catch (
IOException e) {
throw new BusinessException(e);
}
}
return result.toString().getBytes();
}
File getLogfile() {
return new File(logFileLocation);
}
public String getContentType() {
return "text/plain";
}
}