/*
* Autopsy Forensic Browser
*
* Copyright 2011-2014 Basis Technology Corp.
* Contact: carrier <at> sleuthkit <dot> org
*
* 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.sleuthkit.autopsy.datamodel;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
import java.util.logging.Level;
import java.util.prefs.PreferenceChangeEvent;
import java.util.prefs.PreferenceChangeListener;
import org.openide.util.NbBundle;
import org.sleuthkit.autopsy.coreutils.Logger;
import javax.swing.SwingWorker;
import org.netbeans.api.progress.ProgressHandle;
import org.sleuthkit.autopsy.core.UserPreferences;
import org.sleuthkit.datamodel.AbstractFile;
import org.sleuthkit.datamodel.Content;
import org.sleuthkit.datamodel.ContentVisitor;
import org.sleuthkit.datamodel.DerivedFile;
import org.sleuthkit.datamodel.Directory;
import org.sleuthkit.datamodel.File;
import org.sleuthkit.datamodel.Image;
import org.sleuthkit.datamodel.LayoutFile;
import org.sleuthkit.datamodel.LocalFile;
import org.sleuthkit.datamodel.ReadContentInputStream;
import org.sleuthkit.datamodel.TskException;
import org.sleuthkit.datamodel.VirtualDirectory;
/**
* Static class of utility methods for Content objects
*/
public final class ContentUtils {
private final static Logger logger = Logger.getLogger(ContentUtils.class.getName());
private static boolean displayTimesInLocalTime = UserPreferences.displayTimesInLocalTime();
private static final SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z");
private static final SimpleDateFormat dateFormatterISO8601 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
static {
UserPreferences.addChangeListener(new PreferenceChangeListener() {
@Override
public void preferenceChange(PreferenceChangeEvent evt) {
if (evt.getKey().equals(UserPreferences.DISPLAY_TIMES_IN_LOCAL_TIME)) {
displayTimesInLocalTime = UserPreferences.displayTimesInLocalTime();
}
}
});
}
// don't instantiate
private ContentUtils() {
throw new AssertionError();
}
/**
* Convert epoch seconds to a string value in the given time zone
*
* @param epochSeconds
* @param tzone
* @return
*/
public static String getStringTime(long epochSeconds, TimeZone tzone) {
String time = "0000-00-00 00:00:00";
if (epochSeconds != 0) {
synchronized (dateFormatter) {
dateFormatter.setTimeZone(tzone);
time = dateFormatter.format(new java.util.Date(epochSeconds * 1000));
}
}
return time;
}
public static String getStringTimeISO8601(long epochSeconds, TimeZone tzone) {
String time = "0000-00-00T00:00:00Z"; //NON-NLS
if (epochSeconds != 0) {
synchronized (dateFormatterISO8601) {
dateFormatterISO8601.setTimeZone(tzone);
time = dateFormatterISO8601.format(new java.util.Date(epochSeconds * 1000));
}
}
return time;
}
/**
* Convert epoch seconds to a string value (convenience method)
*
* @param epochSeconds
* @param c
* @return
*/
public static String getStringTime(long epochSeconds, Content c) {
return getStringTime(epochSeconds, getTimeZone(c));
}
/**
* Convert epoch seconds to a string value (convenience method) in ISO8601
* format such as 2008-07-04T13:45:04Z
*
* @param epochSeconds
* @param c
* @return
*/
public static String getStringTimeISO8601(long epochSeconds, Content c) {
return getStringTimeISO8601(epochSeconds, getTimeZone(c));
}
public static TimeZone getTimeZone(Content c) {
try {
if (!shouldDisplayTimesInLocalTime()) {
return TimeZone.getTimeZone("GMT");
}
else {
final Content dataSource = c.getDataSource();
if ((dataSource != null) && (dataSource instanceof Image)) {
Image image = (Image)dataSource;
return TimeZone.getTimeZone(image.getTimeZone());
} else {
//case such as top level VirtualDirectory
return TimeZone.getDefault();
}
}
} catch (TskException ex) {
return TimeZone.getDefault();
}
}
private static final SystemNameVisitor systemName = new SystemNameVisitor();
public static String getSystemName(Content content) {
return content.accept(systemName);
}
private static class SystemNameVisitor extends ContentVisitor.Default<String> {
SystemNameVisitor() {
}
@Override
protected String defaultVisit(Content cntnt) {
return cntnt.getName() + ":" + Long.toString(cntnt.getId());
}
}
private static final int TO_FILE_BUFFER_SIZE = 8192;
/**
* Reads all the data from any content object and writes (extracts) it to a
* file.
*
* @param content Any content object.
* @param outputFile Will be created if it doesn't exist, and overwritten if
* it does
* @param progress progress bar handle to update, if available. null
* otherwise
* @param worker the swing worker background thread the process runs within,
* or null, if in the main thread, used to handle task cancellation
* @param source true if source file
* @return number of bytes extracted
* @throws IOException if file could not be written
*/
public static <T,V> long writeToFile(Content content, java.io.File outputFile,
ProgressHandle progress, SwingWorker<T,V> worker, boolean source) throws IOException {
InputStream in = new ReadContentInputStream(content);
boolean append = false;
FileOutputStream out = new FileOutputStream(outputFile, append);
// Get the unit size for a progress bar
int unit = (int) (content.getSize() / 100);
long totalRead = 0;
try {
byte[] buffer = new byte[TO_FILE_BUFFER_SIZE];
int len = in.read(buffer);
while (len != -1) {
// If there is a worker, check for a cancelation
if (worker != null && worker.isCancelled()) {
break;
}
out.write(buffer, 0, len);
len = in.read(buffer);
totalRead += len;
// If there is a progress bar and this is the source file,
// report any progress
if (progress != null && source && totalRead >= TO_FILE_BUFFER_SIZE) {
int totalProgress = (int) (totalRead / unit);
progress.progress(content.getName(), totalProgress);
// If it's not the source, just update the file being processed
} else if (progress != null && !source) {
progress.progress(content.getName());
}
}
} finally {
out.close();
}
return totalRead;
}
public static void writeToFile(Content content, java.io.File outputFile) throws IOException {
writeToFile(content, outputFile, null, null, false);
}
/**
* Helper to ignore the '.' and '..' directories
*/
public static boolean isDotDirectory(AbstractFile dir) {
String name = dir.getName();
return name.equals(".") || name.equals("..");
}
/**
* Extracts file/folder as given destination file, recursing into folders.
* Assumes there will be no collisions with existing directories/files, and
* that the directory to contain the destination file already exists.
*/
public static class ExtractFscContentVisitor<T,V> extends ContentVisitor.Default<Void> {
java.io.File dest;
ProgressHandle progress;
SwingWorker<T,V> worker;
boolean source = false;
/**
* Make new extractor for a specific destination
*
* @param dest The file/folder visited will be extracted as this file
* @param progress progress bar handle to update, if available. null
* otherwise
* @param worker the swing worker background thread the process runs
* within, or null, if in the main thread, used to handle task
* cancellation
* @param source true if source file
*/
public ExtractFscContentVisitor(java.io.File dest,
ProgressHandle progress, SwingWorker<T,V> worker, boolean source) {
this.dest = dest;
this.progress = progress;
this.worker = worker;
this.source = source;
}
public ExtractFscContentVisitor(java.io.File dest) {
this.dest = dest;
}
/**
* Convenience method to make a new instance for given destination and
* extract given content
*/
public static <T,V> void extract(Content cntnt, java.io.File dest, ProgressHandle progress, SwingWorker<T,V> worker) {
cntnt.accept(new ExtractFscContentVisitor<>(dest, progress, worker, true));
}
@Override
public Void visit(File f) {
try {
ContentUtils.writeToFile(f, dest, progress, worker, source);
} catch (IOException ex) {
logger.log(Level.SEVERE,
"Trouble extracting file to " + dest.getAbsolutePath(), //NON-NLS
ex);
}
return null;
}
@Override
public Void visit(LayoutFile f) {
try {
ContentUtils.writeToFile(f, dest, progress, worker, source);
} catch (IOException ex) {
logger.log(Level.SEVERE,
"Trouble extracting unallocated content file to " + dest.getAbsolutePath(), //NON-NLS
ex);
}
return null;
}
@Override
public Void visit(DerivedFile df) {
try {
ContentUtils.writeToFile(df, dest, progress, worker, source);
} catch (IOException ex) {
logger.log(Level.SEVERE,
"Error extracting derived file to " + dest.getAbsolutePath(), //NON-NLS
ex);
}
return null;
}
@Override
public Void visit(LocalFile lf) {
try {
ContentUtils.writeToFile(lf, dest, progress, worker, source);
} catch (IOException ex) {
logger.log(Level.SEVERE,
"Error extracting local file to " + dest.getAbsolutePath(), //NON-NLS
ex);
}
return null;
}
@Override
public Void visit(Directory dir) {
return visitDir(dir);
}
@Override
public Void visit(VirtualDirectory dir) {
return visitDir(dir);
}
private java.io.File getFsContentDest(Content fsc) {
String path = dest.getAbsolutePath() + java.io.File.separator
+ fsc.getName();
return new java.io.File(path);
}
public Void visitDir(AbstractFile dir) {
// don't extract . and .. directories
if (isDotDirectory(dir)) {
return null;
}
dest.mkdir();
try {
int numProcessed = 0;
// recurse on children
for (Content child : dir.getChildren()) {
java.io.File childFile = getFsContentDest(child);
ExtractFscContentVisitor<T,V> childVisitor =
new ExtractFscContentVisitor<>(childFile, progress, worker, false);
// If this is the source directory of an extract it
// will have a progress and worker, and will keep track
// of the progress bar's progress
if (worker != null && worker.isCancelled()) {
break;
}
if (progress != null && source) {
progress.progress(child.getName(), numProcessed);
}
child.accept(childVisitor);
numProcessed++;
}
} catch (TskException ex) {
logger.log(Level.SEVERE,
"Trouble fetching children to extract.", ex); //NON-NLS
}
return null;
}
@Override
protected Void defaultVisit(Content cntnt) {
throw new UnsupportedOperationException(NbBundle.getMessage(this.getClass(),
"ContentUtils.exception.msg",
cntnt.getClass().getSimpleName()));
}
}
/**
* Indicates whether or not times should be displayed using local time.
*
* @return True or false.
*/
public static boolean shouldDisplayTimesInLocalTime(){
return displayTimesInLocalTime;
}
}