/*
* 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.catalina.webresources;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.attribute.BasicFileAttributes;
import java.security.cert.Certificate;
import java.util.concurrent.locks.Lock;
import java.util.jar.Manifest;
import org.apache.catalina.WebResourceLockSet;
import org.apache.catalina.WebResourceRoot;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Represents a single resource (file or directory) that is located on a file system.
*/
public class FileResource extends AbstractResource {
private static final Log log = LogFactory.getLog(FileResource.class);
private static final boolean PROPERTIES_NEED_CONVERT;
static {
boolean isEBCDIC = false;
try {
String encoding = Charset.defaultCharset().displayName();
if (encoding.contains("EBCDIC")) {
isEBCDIC = true;
}
} catch (SecurityException e) {
// Ignore
}
PROPERTIES_NEED_CONVERT = isEBCDIC;
}
private final File resource;
private final String name;
private final boolean readOnly;
private final Manifest manifest;
private final boolean needConvert;
private final WebResourceLockSet lockSet;
private final String lockKey;
public FileResource(WebResourceRoot root, String webAppPath, File resource, boolean readOnly, Manifest manifest) {
this(root, webAppPath, resource, readOnly, manifest, null, null);
}
public FileResource(WebResourceRoot root, String webAppPath, File resource, boolean readOnly, Manifest manifest,
WebResourceLockSet lockSet, String lockKey) {
super(root, webAppPath);
this.resource = resource;
this.lockSet = lockSet;
this.lockKey = lockKey;
if (webAppPath.charAt(webAppPath.length() - 1) == '/') {
String realName = resource.getName() + '/';
if (webAppPath.endsWith(realName)) {
name = resource.getName();
} else {
// This is the root directory of a mounted ResourceSet
// Need to return the mounted name, not the real name
int endOfName = webAppPath.length() - 1;
name = webAppPath.substring(webAppPath.lastIndexOf('/', endOfName - 1) + 1, endOfName);
}
} else {
// Must be a file
name = resource.getName();
}
this.readOnly = readOnly;
this.manifest = manifest;
this.needConvert = PROPERTIES_NEED_CONVERT && name.endsWith(".properties");
}
@Override
public long getLastModified() {
return resource.lastModified();
}
@Override
public boolean exists() {
return resource.exists();
}
@Override
public boolean isVirtual() {
return false;
}
@Override
public boolean isDirectory() {
return resource.isDirectory();
}
@Override
public boolean isFile() {
return resource.isFile();
}
@Override
public boolean delete() {
if (readOnly) {
return false;
}
/*
* Lock the path for writing until the delete is complete. The lock prevents concurrent reads and writes (e.g.
* HTTP GET and PUT / DELETE) for the same path causing corruption of the FileResource where some of the fields
* are set as if the file exists and some as set as if it does not.
*/
Lock writeLock = null;
if (lockSet != null) {
writeLock = lockSet.getLock(lockKey).writeLock();
writeLock.lock();
}
try {
return resource.delete();
} finally {
if (writeLock != null) {
writeLock.unlock();
}
}
}
@Override
public String getName() {
return name;
}
@Override
public long getContentLength() {
return getContentLengthInternal(needConvert);
}
private long getContentLengthInternal(boolean convert) {
if (convert) {
byte[] content = getContent();
if (content == null) {
return -1;
} else {
return content.length;
}
}
if (isDirectory()) {
return -1;
}
return resource.length();
}
@Override
public String getCanonicalPath() {
try {
return resource.getCanonicalPath();
} catch (IOException ioe) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("fileResource.getCanonicalPathFail", resource.getPath()), ioe);
}
return null;
}
}
@Override
public boolean canRead() {
return resource.canRead();
}
@Override
protected InputStream doGetInputStream() {
if (needConvert) {
byte[] content = getContent();
if (content == null) {
return null;
} else {
return new ByteArrayInputStream(content);
}
}
try {
return new FileInputStream(resource);
} catch (FileNotFoundException fnfe) {
// Race condition (file has been deleted) - not an error
return null;
}
}
@Override
public final byte[] getContent() {
// Use internal version to avoid loop when needConvert is true
long len = getContentLengthInternal(false);
if (len > Integer.MAX_VALUE) {
// Can't create an array that big
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractResource.getContentTooLarge", getWebappPath(), Long.valueOf(len)));
}
return null;
}
if (len < 0) {
// Content is not applicable here (e.g. is a directory)
return null;
}
int size = (int) len;
byte[] result = new byte[size];
int pos = 0;
try (InputStream is = new FileInputStream(resource)) {
while (pos < size) {
int n = is.read(result, pos, size - pos);
if (n < 0) {
break;
}
pos += n;
}
} catch (IOException ioe) {
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractResource.getContentFail", getWebappPath()), ioe);
}
return null;
}
if (needConvert) {
// Workaround for certain files on platforms that use
// EBCDIC encoding, when they are read through FileInputStream.
// See commit message of rev.303915 for original details
// https://svn.apache.org/viewvc?view=revision&revision=303915
String str = new String(result);
try {
result = str.getBytes(StandardCharsets.UTF_8);
} catch (Exception e) {
result = null;
}
}
return result;
}
@Override
public long getCreation() {
try {
BasicFileAttributes attrs = Files.readAttributes(resource.toPath(), BasicFileAttributes.class);
return attrs.creationTime().toMillis();
} catch (IOException ioe) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("fileResource.getCreationFail", resource.getPath()), ioe);
}
return 0;
}
}
@Override
public URL getURL() {
if (resource.exists()) {
try {
return resource.toURI().toURL();
} catch (MalformedURLException e) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("fileResource.getUrlFail", resource.getPath()), e);
}
return null;
}
} else {
return null;
}
}
@Override
public URL getCodeBase() {
if (getWebappPath().startsWith("/WEB-INF/classes/") && name.endsWith(".class")) {
return getWebResourceRoot().getResource("/WEB-INF/classes/").getURL();
} else {
return getURL();
}
}
@Override
public Certificate[] getCertificates() {
return null;
}
@Override
public Manifest getManifest() {
return manifest;
}
@Override
protected Log getLog() {
return log;
}
}