/*
* Copyright 2012-2016 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.springframework.boot.actuate.endpoint.mvc;
import java.io.File;
import java.io.IOException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.logging.LogFile;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.resource.ResourceHttpRequestHandler;
/**
* Controller that provides an API for logfiles, i.e. downloading the main logfile
* configured in environment property 'logging.file' that is standard, but optional
* property for spring-boot applications.
*
* @author Johannes Edmeier
* @author Phillip Webb
* @since 1.3.0
*/
@ConfigurationProperties(prefix = "endpoints.logfile")
public class LogFileMvcEndpoint extends AbstractNamedMvcEndpoint {
private static final Log logger = LogFactory.getLog(LogFileMvcEndpoint.class);
/**
* External Logfile to be accessed. Can be used if the logfile is written by output
* redirect and not by the logging-system itself.
*/
private File externalFile;
public LogFileMvcEndpoint() {
super("logfile", "/logfile", true);
}
public File getExternalFile() {
return this.externalFile;
}
public void setExternalFile(File externalFile) {
this.externalFile = externalFile;
}
@RequestMapping(method = { RequestMethod.GET, RequestMethod.HEAD })
public void invoke(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (!isEnabled()) {
response.setStatus(HttpStatus.NOT_FOUND.value());
return;
}
Resource resource = getLogFileResource();
if (resource != null && !resource.exists()) {
if (logger.isDebugEnabled()) {
logger.debug("Log file '" + resource + "' does not exist");
}
resource = null;
}
Handler handler = new Handler(resource, request.getServletContext());
handler.handleRequest(request, response);
}
private Resource getLogFileResource() {
if (this.externalFile != null) {
return new FileSystemResource(this.externalFile);
}
LogFile logFile = LogFile.get(getEnvironment());
if (logFile == null) {
logger.debug("Missing 'logging.file' or 'logging.path' properties");
return null;
}
return new FileSystemResource(logFile.toString());
}
/**
* {@link ResourceHttpRequestHandler} to send the log file.
*/
private static class Handler extends ResourceHttpRequestHandler {
private final Resource resource;
Handler(Resource resource, ServletContext servletContext) {
this.resource = resource;
getLocations().add(resource);
try {
setServletContext(servletContext);
afterPropertiesSet();
}
catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
@Override
protected void initAllowedLocations() {
this.getLocations().clear();
}
@Override
protected Resource getResource(HttpServletRequest request) throws IOException {
return this.resource;
}
@Override
protected MediaType getMediaType(HttpServletRequest request, Resource resource) {
return MediaType.TEXT_PLAIN;
}
}
}