org.apache.sshd.common.subsystem.sftp.SftpHelper Maven / Gradle / Ivy
/*
* 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.sshd.common.subsystem.sftp;
import java.io.EOFException;
import java.io.FileNotFoundException;
import java.net.UnknownServiceException;
import java.nio.channels.OverlappingFileLockException;
import java.nio.charset.StandardCharsets;
import java.nio.file.AccessDeniedException;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.FileSystemLoopException;
import java.nio.file.InvalidPathException;
import java.nio.file.NoSuchFileException;
import java.nio.file.NotDirectoryException;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclEntryFlag;
import java.nio.file.attribute.AclEntryPermission;
import java.nio.file.attribute.AclEntryType;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.PosixFilePermissions;
import java.nio.file.attribute.UserPrincipal;
import java.nio.file.attribute.UserPrincipalNotFoundException;
import java.security.Principal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.TimeUnit;
import org.apache.sshd.common.PropertyResolver;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.OsUtils;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.buffer.Buffer;
import org.apache.sshd.common.util.buffer.BufferUtils;
import org.apache.sshd.common.util.buffer.ByteArrayBuffer;
import org.apache.sshd.server.subsystem.sftp.DefaultGroupPrincipal;
import org.apache.sshd.server.subsystem.sftp.InvalidHandleException;
import org.apache.sshd.server.subsystem.sftp.UnixDateFormat;
/**
* @author Apache MINA SSHD Project
*/
public final class SftpHelper {
/**
* Used to control whether to append the end-of-list indicator for SSH_FXP_NAME responses via
* {@link #indicateEndOfNamesList(Buffer, int, PropertyResolver, boolean)} call, as indicated by
* SFTP v6 - section 9.4
*/
public static final String APPEND_END_OF_LIST_INDICATOR = "sftp-append-eol-indicator";
/**
* Default value for {@link #APPEND_END_OF_LIST_INDICATOR} if none configured
*/
public static final boolean DEFAULT_APPEND_END_OF_LIST_INDICATOR = true;
public static final Map DEFAULT_SUBSTATUS_MESSAGE;
static {
Map map = new TreeMap<>(Comparator.naturalOrder());
map.put(SftpConstants.SSH_FX_OK, "Success");
map.put(SftpConstants.SSH_FX_EOF, "End of file");
map.put(SftpConstants.SSH_FX_NO_SUCH_FILE, "No such file or directory");
map.put(SftpConstants.SSH_FX_PERMISSION_DENIED, "Permission denied");
map.put(SftpConstants.SSH_FX_FAILURE, "General failure");
map.put(SftpConstants.SSH_FX_BAD_MESSAGE, "Bad message data");
map.put(SftpConstants.SSH_FX_NO_CONNECTION, "No connection to server");
map.put(SftpConstants.SSH_FX_CONNECTION_LOST, "Connection lost");
map.put(SftpConstants.SSH_FX_OP_UNSUPPORTED, "Unsupported operation requested");
map.put(SftpConstants.SSH_FX_INVALID_HANDLE, "Invalid handle value");
map.put(SftpConstants.SSH_FX_NO_SUCH_PATH, "No such path");
map.put(SftpConstants.SSH_FX_FILE_ALREADY_EXISTS, "File/Directory already exists");
map.put(SftpConstants.SSH_FX_WRITE_PROTECT, "File/Directory is write-protected");
map.put(SftpConstants.SSH_FX_NO_MEDIA, "No such meadia");
map.put(SftpConstants.SSH_FX_NO_SPACE_ON_FILESYSTEM, "No space left on device");
map.put(SftpConstants.SSH_FX_QUOTA_EXCEEDED, "Quota exceeded");
map.put(SftpConstants.SSH_FX_UNKNOWN_PRINCIPAL, "Unknown user/group");
map.put(SftpConstants.SSH_FX_LOCK_CONFLICT, "Lock conflict");
map.put(SftpConstants.SSH_FX_DIR_NOT_EMPTY, "Directory not empty");
map.put(SftpConstants.SSH_FX_NOT_A_DIRECTORY, "Accessed location is not a directory");
map.put(SftpConstants.SSH_FX_INVALID_FILENAME, "Invalid filename");
map.put(SftpConstants.SSH_FX_LINK_LOOP, "Link loop");
map.put(SftpConstants.SSH_FX_CANNOT_DELETE, "Cannot remove");
map.put(SftpConstants.SSH_FX_INVALID_PARAMETER, "Invalid parameter");
map.put(SftpConstants.SSH_FX_FILE_IS_A_DIRECTORY, "Accessed location is a directory");
map.put(SftpConstants.SSH_FX_BYTE_RANGE_LOCK_CONFLICT, "Range lock conflict");
map.put(SftpConstants.SSH_FX_BYTE_RANGE_LOCK_REFUSED, "Range lock refused");
map.put(SftpConstants.SSH_FX_DELETE_PENDING, "Delete pending");
map.put(SftpConstants.SSH_FX_FILE_CORRUPT, "Corrupted file/directory");
map.put(SftpConstants.SSH_FX_OWNER_INVALID, "Invalid file/directory owner");
map.put(SftpConstants.SSH_FX_GROUP_INVALID, "Invalid file/directory group");
map.put(SftpConstants.SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK, "No matching byte range lock");
DEFAULT_SUBSTATUS_MESSAGE = Collections.unmodifiableMap(map);
}
private SftpHelper() {
throw new UnsupportedOperationException("No instance allowed");
}
/**
* Retrieves the end-of-file indicator for {@code SSH_FXP_DATA} responses, provided the version is at least 6, and
* the buffer has enough available data
*
* @param buffer The {@link Buffer} to retrieve the data from
* @param version The SFTP version being used
* @return The indicator value - {@code null} if none retrieved
* @see SFTP v6 - section
* 9.3
*/
public static Boolean getEndOfFileIndicatorValue(Buffer buffer, int version) {
return (version < SftpConstants.SFTP_V6) || (buffer.available() < 1) ? null : buffer.getBoolean();
}
/**
* Retrieves the end-of-list indicator for {@code SSH_FXP_NAME} responses, provided the version is at least 6, and
* the buffer has enough available data
*
* @param buffer The {@link Buffer} to retrieve the data from
* @param version The SFTP version being used
* @return The indicator value - {@code null} if none retrieved
* @see SFTP v6 - section
* 9.4
* @see #indicateEndOfNamesList(Buffer, int, PropertyResolver, boolean)
*/
public static Boolean getEndOfListIndicatorValue(Buffer buffer, int version) {
return (version < SftpConstants.SFTP_V6) || (buffer.available() < 1) ? null : buffer.getBoolean();
}
/**
* Appends the end-of-list={@code TRUE} indicator for {@code SSH_FXP_NAME} responses, provided the version is at
* least 6 and the feature is enabled
*
* @param buffer The {@link Buffer} to append the indicator
* @param version The SFTP version being used
* @param resolver The {@link PropertyResolver} to query whether to enable the feature
* @return The actual indicator value used - {@code null} if none appended
* @see #indicateEndOfNamesList(Buffer, int, PropertyResolver, boolean)
*/
public static Boolean indicateEndOfNamesList(Buffer buffer, int version, PropertyResolver resolver) {
return indicateEndOfNamesList(buffer, version, resolver, true);
}
/**
* Appends the end-of-list indicator for {@code SSH_FXP_NAME} responses, provided the version is at least 6, the
* feature is enabled and the indicator value is not {@code null}
*
* @param buffer The {@link Buffer} to append the indicator
* @param version The SFTP version being used
* @param resolver The {@link PropertyResolver} to query whether to enable the feature
* @param indicatorValue The indicator value - {@code null} means don't append the indicator
* @return The actual indicator value used - {@code null} if none appended
* @see SFTP v6 -
* section 9.4
* @see #APPEND_END_OF_LIST_INDICATOR
* @see #DEFAULT_APPEND_END_OF_LIST_INDICATOR
*/
public static Boolean indicateEndOfNamesList(
Buffer buffer, int version, PropertyResolver resolver, boolean indicatorValue) {
if (version < SftpConstants.SFTP_V6) {
return null;
}
if (!resolver.getBooleanProperty(APPEND_END_OF_LIST_INDICATOR, DEFAULT_APPEND_END_OF_LIST_INDICATOR)) {
return null;
}
buffer.putBoolean(indicatorValue);
return indicatorValue;
}
/**
* Writes a file / folder's attributes to a buffer
*
* @param Type of {@link Buffer} being updated
* @param buffer The target buffer instance
* @param version The output encoding version
* @param attributes The {@link Map} of attributes
* @return The updated buffer
* @see #writeAttrsV3(Buffer, int, Map)
* @see #writeAttrsV4(Buffer, int, Map)
*/
public static B writeAttrs(B buffer, int version, Map attributes) {
if (version == SftpConstants.SFTP_V3) {
return writeAttrsV3(buffer, version, attributes);
} else if (version >= SftpConstants.SFTP_V4) {
return writeAttrsV4(buffer, version, attributes);
} else {
throw new IllegalStateException("Unsupported SFTP version: " + version);
}
}
/**
* Writes the retrieved file / directory attributes in V3 format
*
* @param Type of {@link Buffer} being updated
* @param buffer The target buffer instance
* @param version The actual version - must be {@link SftpConstants#SFTP_V3}
* @param attributes The {@link Map} of attributes
* @return The updated buffer
*/
public static B writeAttrsV3(B buffer, int version, Map attributes) {
ValidateUtils.checkTrue(version == SftpConstants.SFTP_V3, "Illegal version: %d", version);
boolean isReg = getBool((Boolean) attributes.get("isRegularFile"));
boolean isDir = getBool((Boolean) attributes.get("isDirectory"));
boolean isLnk = getBool((Boolean) attributes.get("isSymbolicLink"));
@SuppressWarnings("unchecked")
Collection perms = (Collection) attributes.get("permissions");
Number size = (Number) attributes.get("size");
FileTime lastModifiedTime = (FileTime) attributes.get("lastModifiedTime");
FileTime lastAccessTime = (FileTime) attributes.get("lastAccessTime");
Map extensions = (Map) attributes.get("extended");
int flags = ((isReg || isLnk) && (size != null) ? SftpConstants.SSH_FILEXFER_ATTR_SIZE : 0)
| (attributes.containsKey("uid") && attributes.containsKey("gid")
? SftpConstants.SSH_FILEXFER_ATTR_UIDGID : 0)
| ((perms != null) ? SftpConstants.SSH_FILEXFER_ATTR_PERMISSIONS : 0)
| (((lastModifiedTime != null) && (lastAccessTime != null)) ? SftpConstants.SSH_FILEXFER_ATTR_ACMODTIME : 0)
| ((extensions != null) ? SftpConstants.SSH_FILEXFER_ATTR_EXTENDED : 0);
buffer.putInt(flags);
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_SIZE) != 0) {
buffer.putLong(size.longValue());
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_UIDGID) != 0) {
buffer.putInt(((Number) attributes.get("uid")).intValue());
buffer.putInt(((Number) attributes.get("gid")).intValue());
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_PERMISSIONS) != 0) {
buffer.putInt(attributesToPermissions(isReg, isDir, isLnk, perms));
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_ACMODTIME) != 0) {
buffer = writeTime(buffer, version, flags, lastAccessTime);
buffer = writeTime(buffer, version, flags, lastModifiedTime);
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_EXTENDED) != 0) {
buffer = writeExtensions(buffer, extensions);
}
return buffer;
}
/**
* Writes the retrieved file / directory attributes in V4+ format
*
* @param Type of {@link Buffer} being updated
* @param buffer The target buffer instance
* @param version The actual version - must be at least {@link SftpConstants#SFTP_V4}
* @param attributes The {@link Map} of attributes
* @return The updated buffer
*/
public static B writeAttrsV4(B buffer, int version, Map attributes) {
ValidateUtils.checkTrue(version >= SftpConstants.SFTP_V4, "Illegal version: %d", version);
boolean isReg = getBool((Boolean) attributes.get("isRegularFile"));
boolean isDir = getBool((Boolean) attributes.get("isDirectory"));
boolean isLnk = getBool((Boolean) attributes.get("isSymbolicLink"));
@SuppressWarnings("unchecked")
Collection perms = (Collection) attributes.get("permissions");
Number size = (Number) attributes.get("size");
FileTime lastModifiedTime = (FileTime) attributes.get("lastModifiedTime");
FileTime lastAccessTime = (FileTime) attributes.get("lastAccessTime");
FileTime creationTime = (FileTime) attributes.get("creationTime");
@SuppressWarnings("unchecked")
Collection acl = (Collection) attributes.get("acl");
Map extensions = (Map) attributes.get("extended");
int flags = (((isReg || isLnk) && (size != null)) ? SftpConstants.SSH_FILEXFER_ATTR_SIZE : 0)
| ((attributes.containsKey("owner") && attributes.containsKey("group"))
? SftpConstants.SSH_FILEXFER_ATTR_OWNERGROUP : 0)
| ((perms != null) ? SftpConstants.SSH_FILEXFER_ATTR_PERMISSIONS : 0)
| ((lastModifiedTime != null) ? SftpConstants.SSH_FILEXFER_ATTR_MODIFYTIME : 0)
| ((creationTime != null) ? SftpConstants.SSH_FILEXFER_ATTR_CREATETIME : 0)
| ((lastAccessTime != null) ? SftpConstants.SSH_FILEXFER_ATTR_ACCESSTIME : 0)
| ((acl != null) ? SftpConstants.SSH_FILEXFER_ATTR_ACL : 0)
| ((extensions != null) ? SftpConstants.SSH_FILEXFER_ATTR_EXTENDED : 0);
buffer.putInt(flags);
buffer.putByte((byte) (isReg ? SftpConstants.SSH_FILEXFER_TYPE_REGULAR
: isDir ? SftpConstants.SSH_FILEXFER_TYPE_DIRECTORY
: isLnk ? SftpConstants.SSH_FILEXFER_TYPE_SYMLINK
: SftpConstants.SSH_FILEXFER_TYPE_UNKNOWN));
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_SIZE) != 0) {
buffer.putLong(size.longValue());
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_OWNERGROUP) != 0) {
buffer.putString(Objects.toString(attributes.get("owner"), SftpUniversalOwnerAndGroup.Owner.getName()));
buffer.putString(Objects.toString(attributes.get("group"), SftpUniversalOwnerAndGroup.Group.getName()));
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_PERMISSIONS) != 0) {
buffer.putInt(attributesToPermissions(isReg, isDir, isLnk, perms));
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_ACCESSTIME) != 0) {
buffer = writeTime(buffer, version, flags, lastAccessTime);
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_CREATETIME) != 0) {
buffer = writeTime(buffer, version, flags, lastAccessTime);
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_MODIFYTIME) != 0) {
buffer = writeTime(buffer, version, flags, lastModifiedTime);
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_ACL) != 0) {
buffer = writeACLs(buffer, version, acl);
}
// TODO: ctime
// TODO: bits
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_EXTENDED) != 0) {
buffer = writeExtensions(buffer, extensions);
}
return buffer;
}
/**
* @param bool The {@link Boolean} value
* @return {@code true} it the argument is non-{@code null} and its {@link Boolean#booleanValue()} is
* {@code true}
*/
public static boolean getBool(Boolean bool) {
return bool != null && bool;
}
/**
* Converts a file / folder's attributes into a mask
*
* @param isReg {@code true} if this is a normal file
* @param isDir {@code true} if this is a directory
* @param isLnk {@code true} if this is a symbolic link
* @param perms The file / folder's access {@link PosixFilePermission}s
* @return A mask encoding the file / folder's attributes
*/
public static int attributesToPermissions(
boolean isReg, boolean isDir, boolean isLnk, Collection perms) {
int pf = 0;
if (perms != null) {
for (PosixFilePermission p : perms) {
switch (p) {
case OWNER_READ:
pf |= SftpConstants.S_IRUSR;
break;
case OWNER_WRITE:
pf |= SftpConstants.S_IWUSR;
break;
case OWNER_EXECUTE:
pf |= SftpConstants.S_IXUSR;
break;
case GROUP_READ:
pf |= SftpConstants.S_IRGRP;
break;
case GROUP_WRITE:
pf |= SftpConstants.S_IWGRP;
break;
case GROUP_EXECUTE:
pf |= SftpConstants.S_IXGRP;
break;
case OTHERS_READ:
pf |= SftpConstants.S_IROTH;
break;
case OTHERS_WRITE:
pf |= SftpConstants.S_IWOTH;
break;
case OTHERS_EXECUTE:
pf |= SftpConstants.S_IXOTH;
break;
default: // ignored
}
}
}
pf |= isReg ? SftpConstants.S_IFREG : 0;
pf |= isDir ? SftpConstants.S_IFDIR : 0;
pf |= isLnk ? SftpConstants.S_IFLNK : 0;
return pf;
}
/**
* Converts a POSIX permissions mask to a file type value
*
* @param perms The POSIX permissions mask
* @return The file type - see {@code SSH_FILEXFER_TYPE_xxx} values
*/
public static int permissionsToFileType(int perms) {
if ((SftpConstants.S_IFLNK & perms) == SftpConstants.S_IFLNK) {
return SftpConstants.SSH_FILEXFER_TYPE_SYMLINK;
} else if ((SftpConstants.S_IFREG & perms) == SftpConstants.S_IFREG) {
return SftpConstants.SSH_FILEXFER_TYPE_REGULAR;
} else if ((SftpConstants.S_IFDIR & perms) == SftpConstants.S_IFDIR) {
return SftpConstants.SSH_FILEXFER_TYPE_DIRECTORY;
} else if ((SftpConstants.S_IFSOCK & perms) == SftpConstants.S_IFSOCK) {
return SftpConstants.SSH_FILEXFER_TYPE_SOCKET;
} else if ((SftpConstants.S_IFBLK & perms) == SftpConstants.S_IFBLK) {
return SftpConstants.SSH_FILEXFER_TYPE_BLOCK_DEVICE;
} else if ((SftpConstants.S_IFCHR & perms) == SftpConstants.S_IFCHR) {
return SftpConstants.SSH_FILEXFER_TYPE_CHAR_DEVICE;
} else if ((SftpConstants.S_IFIFO & perms) == SftpConstants.S_IFIFO) {
return SftpConstants.SSH_FILEXFER_TYPE_FIFO;
} else {
return SftpConstants.SSH_FILEXFER_TYPE_UNKNOWN;
}
}
/**
* Converts a file type into a POSIX permission mask value
*
* @param type File type - see {@code SSH_FILEXFER_TYPE_xxx} values
* @return The matching POSIX permission mask value
*/
public static int fileTypeToPermission(int type) {
switch (type) {
case SftpConstants.SSH_FILEXFER_TYPE_REGULAR:
return SftpConstants.S_IFREG;
case SftpConstants.SSH_FILEXFER_TYPE_DIRECTORY:
return SftpConstants.S_IFDIR;
case SftpConstants.SSH_FILEXFER_TYPE_SYMLINK:
return SftpConstants.S_IFLNK;
case SftpConstants.SSH_FILEXFER_TYPE_SOCKET:
return SftpConstants.S_IFSOCK;
case SftpConstants.SSH_FILEXFER_TYPE_BLOCK_DEVICE:
return SftpConstants.S_IFBLK;
case SftpConstants.SSH_FILEXFER_TYPE_CHAR_DEVICE:
return SftpConstants.S_IFCHR;
case SftpConstants.SSH_FILEXFER_TYPE_FIFO:
return SftpConstants.S_IFIFO;
default:
return 0;
}
}
/**
* Translates a mask of permissions into its enumeration values equivalents
*
* @param perms The permissions mask
* @return A {@link Set} of the equivalent {@link PosixFilePermission}s
*/
public static Set permissionsToAttributes(int perms) {
Set p = EnumSet.noneOf(PosixFilePermission.class);
if ((perms & SftpConstants.S_IRUSR) != 0) {
p.add(PosixFilePermission.OWNER_READ);
}
if ((perms & SftpConstants.S_IWUSR) != 0) {
p.add(PosixFilePermission.OWNER_WRITE);
}
if ((perms & SftpConstants.S_IXUSR) != 0) {
p.add(PosixFilePermission.OWNER_EXECUTE);
}
if ((perms & SftpConstants.S_IRGRP) != 0) {
p.add(PosixFilePermission.GROUP_READ);
}
if ((perms & SftpConstants.S_IWGRP) != 0) {
p.add(PosixFilePermission.GROUP_WRITE);
}
if ((perms & SftpConstants.S_IXGRP) != 0) {
p.add(PosixFilePermission.GROUP_EXECUTE);
}
if ((perms & SftpConstants.S_IROTH) != 0) {
p.add(PosixFilePermission.OTHERS_READ);
}
if ((perms & SftpConstants.S_IWOTH) != 0) {
p.add(PosixFilePermission.OTHERS_WRITE);
}
if ((perms & SftpConstants.S_IXOTH) != 0) {
p.add(PosixFilePermission.OTHERS_EXECUTE);
}
return p;
}
/**
* Returns the most adequate sub-status for the provided exception
*
* @param t The thrown {@link Throwable}
* @return The matching sub-status
*/
@SuppressWarnings("checkstyle:ReturnCount")
public static int resolveSubstatus(Throwable t) {
if ((t instanceof NoSuchFileException) || (t instanceof FileNotFoundException)) {
return SftpConstants.SSH_FX_NO_SUCH_FILE;
} else if (t instanceof InvalidHandleException) {
return SftpConstants.SSH_FX_INVALID_HANDLE;
} else if (t instanceof FileAlreadyExistsException) {
return SftpConstants.SSH_FX_FILE_ALREADY_EXISTS;
} else if (t instanceof DirectoryNotEmptyException) {
return SftpConstants.SSH_FX_DIR_NOT_EMPTY;
} else if (t instanceof NotDirectoryException) {
return SftpConstants.SSH_FX_NOT_A_DIRECTORY;
} else if (t instanceof AccessDeniedException) {
return SftpConstants.SSH_FX_PERMISSION_DENIED;
} else if (t instanceof EOFException) {
return SftpConstants.SSH_FX_EOF;
} else if (t instanceof OverlappingFileLockException) {
return SftpConstants.SSH_FX_LOCK_CONFLICT;
} else if ((t instanceof UnsupportedOperationException)
|| (t instanceof UnknownServiceException)) {
return SftpConstants.SSH_FX_OP_UNSUPPORTED;
} else if (t instanceof InvalidPathException) {
return SftpConstants.SSH_FX_INVALID_FILENAME;
} else if (t instanceof IllegalArgumentException) {
return SftpConstants.SSH_FX_INVALID_PARAMETER;
} else if (t instanceof UserPrincipalNotFoundException) {
return SftpConstants.SSH_FX_UNKNOWN_PRINCIPAL;
} else if (t instanceof FileSystemLoopException) {
return SftpConstants.SSH_FX_LINK_LOOP;
} else if (t instanceof SftpException) {
return ((SftpException) t).getStatus();
} else {
return SftpConstants.SSH_FX_FAILURE;
}
}
public static String resolveStatusMessage(int subStatus) {
String message = DEFAULT_SUBSTATUS_MESSAGE.get(subStatus);
return GenericUtils.isEmpty(message) ? ("Unknown error: " + subStatus) : message;
}
public static NavigableMap readAttrs(Buffer buffer, int version) {
NavigableMap attrs = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
int flags = buffer.getInt();
if (version >= SftpConstants.SFTP_V4) {
int type = buffer.getUByte();
switch (type) {
case SftpConstants.SSH_FILEXFER_TYPE_REGULAR:
attrs.put("isRegular", Boolean.TRUE);
break;
case SftpConstants.SSH_FILEXFER_TYPE_DIRECTORY:
attrs.put("isDirectory", Boolean.TRUE);
break;
case SftpConstants.SSH_FILEXFER_TYPE_SYMLINK:
attrs.put("isSymbolicLink", Boolean.TRUE);
break;
case SftpConstants.SSH_FILEXFER_TYPE_SOCKET:
case SftpConstants.SSH_FILEXFER_TYPE_CHAR_DEVICE:
case SftpConstants.SSH_FILEXFER_TYPE_BLOCK_DEVICE:
case SftpConstants.SSH_FILEXFER_TYPE_FIFO:
attrs.put("isOther", Boolean.TRUE);
break;
default: // ignored
}
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_SIZE) != 0) {
attrs.put("size", buffer.getLong());
}
if (version == SftpConstants.SFTP_V3) {
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_UIDGID) != 0) {
attrs.put("uid", buffer.getInt());
attrs.put("gid", buffer.getInt());
}
} else {
if ((version >= SftpConstants.SFTP_V6) && ((flags & SftpConstants.SSH_FILEXFER_ATTR_ALLOCATION_SIZE) != 0)) {
@SuppressWarnings("unused")
long allocSize = buffer.getLong(); // TODO handle allocation size
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_OWNERGROUP) != 0) {
attrs.put("owner", new DefaultGroupPrincipal(buffer.getString()));
attrs.put("group", new DefaultGroupPrincipal(buffer.getString()));
}
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_PERMISSIONS) != 0) {
attrs.put("permissions", permissionsToAttributes(buffer.getInt()));
}
if (version == SftpConstants.SFTP_V3) {
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_ACMODTIME) != 0) {
attrs.put("lastAccessTime", readTime(buffer, version, flags));
attrs.put("lastModifiedTime", readTime(buffer, version, flags));
}
} else if (version >= SftpConstants.SFTP_V4) {
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_ACCESSTIME) != 0) {
attrs.put("lastAccessTime", readTime(buffer, version, flags));
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_CREATETIME) != 0) {
attrs.put("creationTime", readTime(buffer, version, flags));
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_MODIFYTIME) != 0) {
attrs.put("lastModifiedTime", readTime(buffer, version, flags));
}
if ((version >= SftpConstants.SFTP_V6) && (flags & SftpConstants.SSH_FILEXFER_ATTR_CTIME) != 0) {
attrs.put("ctime", readTime(buffer, version, flags));
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_ACL) != 0) {
attrs.put("acl", readACLs(buffer, version));
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_BITS) != 0) {
@SuppressWarnings("unused")
int bits = buffer.getInt();
@SuppressWarnings("unused")
int valid = 0xffffffff;
if (version >= SftpConstants.SFTP_V6) {
valid = buffer.getInt();
}
// TODO: handle attrib bits
}
if (version >= SftpConstants.SFTP_V6) {
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_TEXT_HINT) != 0) {
@SuppressWarnings("unused")
boolean text = buffer.getBoolean(); // TODO: handle text
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_MIME_TYPE) != 0) {
@SuppressWarnings("unused")
String mimeType = buffer.getString(); // TODO: handle mime-type
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_LINK_COUNT) != 0) {
@SuppressWarnings("unused")
int nlink = buffer.getInt(); // TODO: handle link-count
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_UNTRANSLATED_NAME) != 0) {
@SuppressWarnings("unused")
String untranslated = buffer.getString(); // TODO: handle untranslated-name
}
}
}
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_EXTENDED) != 0) {
attrs.put("extended", readExtensions(buffer));
}
return attrs;
}
public static NavigableMap readExtensions(Buffer buffer) {
int count = buffer.getInt();
// Protect against malicious or malformed packets
if ((count < 0) || (count > SshConstants.SSH_REQUIRED_PAYLOAD_PACKET_LENGTH_SUPPORT)) {
throw new IndexOutOfBoundsException("Illogical extensions count: " + count);
}
// NOTE
NavigableMap extended = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
for (int i = 1; i <= count; i++) {
String key = buffer.getString();
byte[] val = buffer.getBytes();
byte[] prev = extended.put(key, val);
ValidateUtils.checkTrue(prev == null, "Duplicate values for extended key=%s", key);
}
return extended;
}
public static B writeExtensions(B buffer, Map extensions) {
int numExtensions = GenericUtils.size(extensions);
buffer.putInt(numExtensions);
if (numExtensions <= 0) {
return buffer;
}
for (Map.Entry ee : extensions.entrySet()) {
Object key = Objects.requireNonNull(ee.getKey(), "No extension type");
Object value = Objects.requireNonNull(ee.getValue(), "No extension value");
buffer.putString(key.toString());
if (value instanceof byte[]) {
buffer.putBytes((byte[]) value);
} else {
buffer.putString(value.toString());
}
}
return buffer;
}
public static NavigableMap toStringExtensions(Map extensions) {
if (GenericUtils.isEmpty(extensions)) {
return Collections.emptyNavigableMap();
}
// NOTE: even though extensions are probably case sensitive we do not allow duplicate name that differs only in
// case
NavigableMap map = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
for (Map.Entry ee : extensions.entrySet()) {
Object key = Objects.requireNonNull(ee.getKey(), "No extension type");
Object value = ValidateUtils.checkNotNull(ee.getValue(), "No value for extension=%s", key);
String prev = map.put(key.toString(),
(value instanceof byte[]) ? new String((byte[]) value, StandardCharsets.UTF_8) : value.toString());
ValidateUtils.checkTrue(prev == null, "Multiple values for extension=%s", key);
}
return map;
}
public static NavigableMap toBinaryExtensions(Map extensions) {
if (GenericUtils.isEmpty(extensions)) {
return Collections.emptyNavigableMap();
}
// NOTE: even though extensions are probably case sensitive we do not allow duplicate name that differs only in
// case
NavigableMap map = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
extensions.forEach((key, value) -> {
ValidateUtils.checkNotNull(value, "No value for extension=%s", key);
byte[] prev = map.put(key, value.getBytes(StandardCharsets.UTF_8));
ValidateUtils.checkTrue(prev == null, "Multiple values for extension=%s", key);
});
return map;
}
// for v4,5 see https://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#page-15
// for v6 see https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#page-21
public static List readACLs(Buffer buffer, int version) {
int aclSize = buffer.getInt();
// Protect against malicious or malformed packets
if ((aclSize < 0) || (aclSize > (2 * SshConstants.SSH_REQUIRED_PAYLOAD_PACKET_LENGTH_SUPPORT))) {
throw new IndexOutOfBoundsException("Illogical ACL entries size: " + aclSize);
}
int startPos = buffer.rpos();
Buffer aclBuffer = new ByteArrayBuffer(buffer.array(), startPos, aclSize, true);
List acl = decodeACLs(aclBuffer, version);
buffer.rpos(startPos + aclSize);
return acl;
}
public static List decodeACLs(Buffer buffer, int version) {
@SuppressWarnings("unused")
int aclFlags = 0; // TODO handle ACL flags
if (version >= SftpConstants.SFTP_V6) {
aclFlags = buffer.getInt();
}
int count = buffer.getInt();
/*
* NOTE: although the value is defined as UINT32 we do not expected a count greater than several hundreds +
* protect against malicious or corrupted packets
*/
if ((count < 0) || (count > SshConstants.SSH_REQUIRED_PAYLOAD_PACKET_LENGTH_SUPPORT)) {
throw new IndexOutOfBoundsException("Illogical ACL entries count: " + count);
}
ValidateUtils.checkTrue(count >= 0, "Invalid ACL entries count: %d", count);
if (count == 0) {
return Collections.emptyList();
}
List acls = new ArrayList<>(count);
for (int i = 1; i <= count; i++) {
int aclType = buffer.getInt();
int aclFlag = buffer.getInt();
int aclMask = buffer.getInt();
String aclWho = buffer.getString();
acls.add(buildAclEntry(aclType, aclFlag, aclMask, aclWho));
}
return acls;
}
public static AclEntry buildAclEntry(int aclType, int aclFlag, int aclMask, String aclWho) {
UserPrincipal who = new DefaultGroupPrincipal(aclWho);
return AclEntry.newBuilder()
.setType(ValidateUtils.checkNotNull(decodeAclEntryType(aclType), "Unknown ACL type: %d", aclType))
.setFlags(decodeAclFlags(aclFlag))
.setPermissions(decodeAclMask(aclMask))
.setPrincipal(who)
.build();
}
/**
* @param aclType The {@code ACE4_ACCESS_xxx_ACE_TYPE} value
* @return The matching {@link AclEntryType} or {@code null} if unknown value
*/
public static AclEntryType decodeAclEntryType(int aclType) {
switch (aclType) {
case SftpConstants.ACE4_ACCESS_ALLOWED_ACE_TYPE:
return AclEntryType.ALLOW;
case SftpConstants.ACE4_ACCESS_DENIED_ACE_TYPE:
return AclEntryType.DENY;
case SftpConstants.ACE4_SYSTEM_AUDIT_ACE_TYPE:
return AclEntryType.AUDIT;
case SftpConstants.ACE4_SYSTEM_ALARM_ACE_TYPE:
return AclEntryType.ALARM;
default:
return null;
}
}
public static Set decodeAclFlags(int aclFlag) {
Set flags = EnumSet.noneOf(AclEntryFlag.class);
if ((aclFlag & SftpConstants.ACE4_FILE_INHERIT_ACE) != 0) {
flags.add(AclEntryFlag.FILE_INHERIT);
}
if ((aclFlag & SftpConstants.ACE4_DIRECTORY_INHERIT_ACE) != 0) {
flags.add(AclEntryFlag.DIRECTORY_INHERIT);
}
if ((aclFlag & SftpConstants.ACE4_NO_PROPAGATE_INHERIT_ACE) != 0) {
flags.add(AclEntryFlag.NO_PROPAGATE_INHERIT);
}
if ((aclFlag & SftpConstants.ACE4_INHERIT_ONLY_ACE) != 0) {
flags.add(AclEntryFlag.INHERIT_ONLY);
}
return flags;
}
public static Set decodeAclMask(int aclMask) {
Set mask = EnumSet.noneOf(AclEntryPermission.class);
if ((aclMask & SftpConstants.ACE4_READ_DATA) != 0) {
mask.add(AclEntryPermission.READ_DATA);
}
if ((aclMask & SftpConstants.ACE4_LIST_DIRECTORY) != 0) {
mask.add(AclEntryPermission.LIST_DIRECTORY);
}
if ((aclMask & SftpConstants.ACE4_WRITE_DATA) != 0) {
mask.add(AclEntryPermission.WRITE_DATA);
}
if ((aclMask & SftpConstants.ACE4_ADD_FILE) != 0) {
mask.add(AclEntryPermission.ADD_FILE);
}
if ((aclMask & SftpConstants.ACE4_APPEND_DATA) != 0) {
mask.add(AclEntryPermission.APPEND_DATA);
}
if ((aclMask & SftpConstants.ACE4_ADD_SUBDIRECTORY) != 0) {
mask.add(AclEntryPermission.ADD_SUBDIRECTORY);
}
if ((aclMask & SftpConstants.ACE4_READ_NAMED_ATTRS) != 0) {
mask.add(AclEntryPermission.READ_NAMED_ATTRS);
}
if ((aclMask & SftpConstants.ACE4_WRITE_NAMED_ATTRS) != 0) {
mask.add(AclEntryPermission.WRITE_NAMED_ATTRS);
}
if ((aclMask & SftpConstants.ACE4_EXECUTE) != 0) {
mask.add(AclEntryPermission.EXECUTE);
}
if ((aclMask & SftpConstants.ACE4_DELETE_CHILD) != 0) {
mask.add(AclEntryPermission.DELETE_CHILD);
}
if ((aclMask & SftpConstants.ACE4_READ_ATTRIBUTES) != 0) {
mask.add(AclEntryPermission.READ_ATTRIBUTES);
}
if ((aclMask & SftpConstants.ACE4_WRITE_ATTRIBUTES) != 0) {
mask.add(AclEntryPermission.WRITE_ATTRIBUTES);
}
if ((aclMask & SftpConstants.ACE4_DELETE) != 0) {
mask.add(AclEntryPermission.DELETE);
}
if ((aclMask & SftpConstants.ACE4_READ_ACL) != 0) {
mask.add(AclEntryPermission.READ_ACL);
}
if ((aclMask & SftpConstants.ACE4_WRITE_ACL) != 0) {
mask.add(AclEntryPermission.WRITE_ACL);
}
if ((aclMask & SftpConstants.ACE4_WRITE_OWNER) != 0) {
mask.add(AclEntryPermission.WRITE_OWNER);
}
if ((aclMask & SftpConstants.ACE4_SYNCHRONIZE) != 0) {
mask.add(AclEntryPermission.SYNCHRONIZE);
}
return mask;
}
public static B writeACLs(B buffer, int version, Collection acl) {
int lenPos = buffer.wpos();
buffer.putInt(0); // length placeholder
buffer = encodeACLs(buffer, version, acl);
BufferUtils.updateLengthPlaceholder(buffer, lenPos);
return buffer;
}
public static B encodeACLs(B buffer, int version, Collection acl) {
Objects.requireNonNull(acl, "No ACL");
if (version >= SftpConstants.SFTP_V6) {
buffer.putInt(0); // TODO handle ACL flags
}
int numEntries = GenericUtils.size(acl);
buffer.putInt(numEntries);
if (numEntries > 0) {
for (AclEntry e : acl) {
buffer = writeAclEntry(buffer, e);
}
}
return buffer;
}
public static B writeAclEntry(B buffer, AclEntry acl) {
Objects.requireNonNull(acl, "No ACL");
AclEntryType type = acl.type();
int aclType = encodeAclEntryType(type);
ValidateUtils.checkTrue(aclType >= 0, "Unknown ACL type: %s", type);
buffer.putInt(aclType);
buffer.putInt(encodeAclFlags(acl.flags()));
buffer.putInt(encodeAclMask(acl.permissions()));
Principal user = acl.principal();
buffer.putString(user.getName());
return buffer;
}
/**
* Returns the equivalent SFTP value for the ACL type
*
* @param type The {@link AclEntryType}
* @return The equivalent {@code ACE_SYSTEM_xxx_TYPE} or negative if {@code null} or unknown type
*/
public static int encodeAclEntryType(AclEntryType type) {
if (type == null) {
return Integer.MIN_VALUE;
}
switch (type) {
case ALARM:
return SftpConstants.ACE4_SYSTEM_ALARM_ACE_TYPE;
case ALLOW:
return SftpConstants.ACE4_ACCESS_ALLOWED_ACE_TYPE;
case AUDIT:
return SftpConstants.ACE4_SYSTEM_AUDIT_ACE_TYPE;
case DENY:
return SftpConstants.ACE4_ACCESS_DENIED_ACE_TYPE;
default:
return -1;
}
}
public static long encodeAclFlags(Collection flags) {
if (GenericUtils.isEmpty(flags)) {
return 0L;
}
long aclFlag = 0L;
if (flags.contains(AclEntryFlag.FILE_INHERIT)) {
aclFlag |= SftpConstants.ACE4_FILE_INHERIT_ACE;
}
if (flags.contains(AclEntryFlag.DIRECTORY_INHERIT)) {
aclFlag |= SftpConstants.ACE4_DIRECTORY_INHERIT_ACE;
}
if (flags.contains(AclEntryFlag.NO_PROPAGATE_INHERIT)) {
aclFlag |= SftpConstants.ACE4_NO_PROPAGATE_INHERIT_ACE;
}
if (flags.contains(AclEntryFlag.INHERIT_ONLY)) {
aclFlag |= SftpConstants.ACE4_INHERIT_ONLY_ACE;
}
return aclFlag;
}
public static long encodeAclMask(Collection mask) {
if (GenericUtils.isEmpty(mask)) {
return 0L;
}
long aclMask = 0L;
if (mask.contains(AclEntryPermission.READ_DATA)) {
aclMask |= SftpConstants.ACE4_READ_DATA;
}
if (mask.contains(AclEntryPermission.LIST_DIRECTORY)) {
aclMask |= SftpConstants.ACE4_LIST_DIRECTORY;
}
if (mask.contains(AclEntryPermission.WRITE_DATA)) {
aclMask |= SftpConstants.ACE4_WRITE_DATA;
}
if (mask.contains(AclEntryPermission.ADD_FILE)) {
aclMask |= SftpConstants.ACE4_ADD_FILE;
}
if (mask.contains(AclEntryPermission.APPEND_DATA)) {
aclMask |= SftpConstants.ACE4_APPEND_DATA;
}
if (mask.contains(AclEntryPermission.ADD_SUBDIRECTORY)) {
aclMask |= SftpConstants.ACE4_ADD_SUBDIRECTORY;
}
if (mask.contains(AclEntryPermission.READ_NAMED_ATTRS)) {
aclMask |= SftpConstants.ACE4_READ_NAMED_ATTRS;
}
if (mask.contains(AclEntryPermission.WRITE_NAMED_ATTRS)) {
aclMask |= SftpConstants.ACE4_WRITE_NAMED_ATTRS;
}
if (mask.contains(AclEntryPermission.EXECUTE)) {
aclMask |= SftpConstants.ACE4_EXECUTE;
}
if (mask.contains(AclEntryPermission.DELETE_CHILD)) {
aclMask |= SftpConstants.ACE4_DELETE_CHILD;
}
if (mask.contains(AclEntryPermission.READ_ATTRIBUTES)) {
aclMask |= SftpConstants.ACE4_READ_ATTRIBUTES;
}
if (mask.contains(AclEntryPermission.WRITE_ATTRIBUTES)) {
aclMask |= SftpConstants.ACE4_WRITE_ATTRIBUTES;
}
if (mask.contains(AclEntryPermission.DELETE)) {
aclMask |= SftpConstants.ACE4_DELETE;
}
if (mask.contains(AclEntryPermission.READ_ACL)) {
aclMask |= SftpConstants.ACE4_READ_ACL;
}
if (mask.contains(AclEntryPermission.WRITE_ACL)) {
aclMask |= SftpConstants.ACE4_WRITE_ACL;
}
if (mask.contains(AclEntryPermission.WRITE_OWNER)) {
aclMask |= SftpConstants.ACE4_WRITE_OWNER;
}
if (mask.contains(AclEntryPermission.SYNCHRONIZE)) {
aclMask |= SftpConstants.ACE4_SYNCHRONIZE;
}
return aclMask;
}
/**
* Encodes a {@link FileTime} value into a buffer
*
* @param Type of {@link Buffer} being updated
* @param buffer The target buffer instance
* @param version The encoding version
* @param flags The encoding flags
* @param time The value to encode
* @return The updated buffer
*/
public static B writeTime(B buffer, int version, int flags, FileTime time) {
// for v3 see https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#page-8
// for v6 see https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#page-16
if (version >= SftpConstants.SFTP_V4) {
buffer.putLong(time.to(TimeUnit.SECONDS));
if ((flags & SftpConstants.SSH_FILEXFER_ATTR_SUBSECOND_TIMES) != 0) {
long nanos = time.to(TimeUnit.NANOSECONDS);
nanos = nanos % TimeUnit.SECONDS.toNanos(1);
buffer.putInt((int) nanos);
}
} else {
buffer.putInt(time.to(TimeUnit.SECONDS));
}
return buffer;
}
/**
* Decodes a {@link FileTime} value from a buffer
*
* @param buffer The source {@link Buffer}
* @param version The encoding version
* @param flags The encoding flags
* @return The decoded value
*/
public static FileTime readTime(Buffer buffer, int version, int flags) {
// for v3 see https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#page-8
// for v6 see https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#page-16
long secs = (version >= SftpConstants.SFTP_V4) ? buffer.getLong() : buffer.getUInt();
long millis = TimeUnit.SECONDS.toMillis(secs);
if ((version >= SftpConstants.SFTP_V4) && ((flags & SftpConstants.SSH_FILEXFER_ATTR_SUBSECOND_TIMES) != 0)) {
long nanoseconds = buffer.getUInt();
millis += TimeUnit.NANOSECONDS.toMillis(nanoseconds);
}
return FileTime.from(millis, TimeUnit.MILLISECONDS);
}
/**
* Creates an "ls -l" compatible long name string
*
* @param shortName The short file name - can also be "." or ".."
* @param attributes The file's attributes - e.g., size, owner, permissions, etc.
* @return A {@link String} representing the "long" file name as per
* SFTP version 3 - section
* 7
*/
public static String getLongName(String shortName, Map attributes) {
String owner = Objects.toString(attributes.get("owner"), null);
String username = OsUtils.getCanonicalUser(owner);
if (GenericUtils.isEmpty(username)) {
username = SftpUniversalOwnerAndGroup.Owner.getName();
}
String group = Objects.toString(attributes.get("group"), null);
group = OsUtils.resolveCanonicalGroup(group, owner);
if (GenericUtils.isEmpty(group)) {
group = SftpUniversalOwnerAndGroup.Group.getName();
}
Number length = (Number) attributes.get("size");
if (length == null) {
length = 0L;
}
String lengthString = String.format("%1$8s", length);
String linkCount = Objects.toString(attributes.get("nlink"), null);
if (GenericUtils.isEmpty(linkCount)) {
linkCount = "1";
}
Boolean isDirectory = (Boolean) attributes.get("isDirectory");
Boolean isLink = (Boolean) attributes.get("isSymbolicLink");
@SuppressWarnings("unchecked")
Set perms = (Set) attributes.get("permissions");
if (perms == null) {
perms = EnumSet.noneOf(PosixFilePermission.class);
}
String permsString = PosixFilePermissions.toString(perms);
String timeStamp = UnixDateFormat.getUnixDate((FileTime) attributes.get("lastModifiedTime"));
StringBuilder sb = new StringBuilder(
GenericUtils.length(linkCount) + GenericUtils.length(username) + GenericUtils.length(group)
+ GenericUtils.length(timeStamp) + GenericUtils.length(lengthString)
+ GenericUtils.length(permsString) + GenericUtils.length(shortName)
+ Integer.SIZE);
sb.append(SftpHelper.getBool(isDirectory) ? 'd' : (SftpHelper.getBool(isLink) ? 'l' : '-')).append(permsString);
sb.append(' ');
for (int index = linkCount.length(); index < 3; index++) {
sb.append(' ');
}
sb.append(linkCount);
sb.append(' ').append(username);
for (int index = username.length(); index < 8; index++) {
sb.append(' ');
}
sb.append(' ').append(group);
for (int index = group.length(); index < 8; index++) {
sb.append(' ');
}
sb.append(' ').append(lengthString).append(' ').append(timeStamp).append(' ').append(shortName);
return sb.toString();
}
}
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