eu.unicore.uftp.server

Class SetUIDFileAccess

java.lang.Object

eu.unicore.uftp.server.SetUIDFileAccess

All Implemented Interfaces:

FileAccess

public class SetUIDFileAccess
extends Object
implements FileAccess

This implementation of FileAccess uses native code to switch to the required user ID before creating or reading a file.
Thread safety: since the user id of the process is mofified, all public methods of this class MUST be synchronized

Author:

schuller

Field Summary

Fields inherited from interface eu.unicore.uftp.server.FileAccess

DEFAULT_BUFFERSIZE

Constructor Summary

Constructors

Constructor and Description
SetUIDFileAccess()

Method Summary

Modifier and Type	Method and Description
void	asUser(Runnable runnable, String userID, String groupID) execute the given Runnable as given user
String	getHome(String userID) gets the user's home directory
RandomAccessFile	getRandomAccessFile(File file, String userID, String groupID, String mode) create a RandomAccessFile for accessing the given path
FileInfo[]	listFiles(File dir, String userID, String groupID) lists files in the given directory
void	mkdir(String path, String userID, String groupID) create a directory.
InputStream	readFile(String canonicalPath, String userID, String groupID, int bufferSize) create a InputStream for reading
void	rm(String path, String userID, String groupID) delete a file or directory
void	setUser(String canonicalPath, String user, String group) set user/group on the given file
FileInfo	stat(String path, String userID, String groupID) get info on a single file
OutputStream	writeFile(String canonicalPath, boolean append, String userID, String groupID, int bufferSize) create a OutputStream for writing

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SetUIDFileAccess

public SetUIDFileAccess()

Method Detail

readFile

public InputStream readFile(String canonicalPath,
                            String userID,
                            String groupID,
                            int bufferSize)
                     throws Exception

Description copied from interface: FileAccess

create a InputStream for reading

Specified by:

readFile in interface FileAccess

Parameters:

canonicalPath - - the canonical path to the file

userID - - the user id

groupID - - the group id

bufferSize - - the buffer size for reading from

Returns:

a InputStream

Throws:

Exception

writeFile

public OutputStream writeFile(String canonicalPath,
                              boolean append,
                              String userID,
                              String groupID,
                              int bufferSize)
                       throws Exception

Description copied from interface: FileAccess

create a OutputStream for writing

Specified by:

writeFile in interface FileAccess

Parameters:

canonicalPath - - the canonical path to the file

userID - - the user id

groupID - - the group id

bufferSize - - the buffer size for writing to disk

Returns:

OutputStream

Throws:

Exception

setUser

public void setUser(String canonicalPath,
                    String user,
                    String group)
             throws Exception

Description copied from interface: FileAccess

set user/group on the given file

Specified by:

setUser in interface FileAccess

Throws:

Exception

getRandomAccessFile

public RandomAccessFile getRandomAccessFile(File file,
                                            String userID,
                                            String groupID,
                                            String mode)
                                     throws IOException

Description copied from interface: FileAccess

create a RandomAccessFile for accessing the given path

Specified by:

getRandomAccessFile in interface FileAccess

Parameters:

file - - the path

userID - - the user id

groupID - - the group id

mode - - the mode (see RandomAccessFile.RandomAccessFile(java.io.File, String)

Returns:

RandomAccessFile

Throws:

IOException

listFiles

public FileInfo[] listFiles(File dir,
                            String userID,
                            String groupID)

Description copied from interface: FileAccess

lists files in the given directory

Specified by:

listFiles in interface FileAccess

userID - - the user id

groupID - - the group id

Returns:

list of FileInfo objects

stat

public FileInfo stat(String path,
                     String userID,
                     String groupID)

Description copied from interface: FileAccess

get info on a single file

Specified by:

stat in interface FileAccess

Parameters:

path - - the file

userID - - the user id

groupID - - the group id

mkdir

public void mkdir(String path,
                  String userID,
                  String groupID)
           throws IOException

Description copied from interface: FileAccess

create a directory. all parent directories must exist

Specified by:

mkdir in interface FileAccess

Parameters:

path - - the directory to create

userID - - user ID

groupID - - group IP

Throws:

IOException

rm

public void rm(String path,
               String userID,
               String groupID)
        throws IOException

Description copied from interface: FileAccess

delete a file or directory

Specified by:

rm in interface FileAccess

Parameters:

path - - the file/directory to delete

userID - - user ID

groupID - - group IP

Throws:

IOException

getHome

public String getHome(String userID)

Description copied from interface: FileAccess

gets the user's home directory

Specified by:

getHome in interface FileAccess

Returns:

user's home directory

asUser

public void asUser(Runnable runnable,
                   String userID,
                   String groupID)
            throws Exception

Description copied from interface: FileAccess

execute the given Runnable as given user

Specified by:

asUser in interface FileAccess

Parameters:

runnable - - a very SHORT task

userID - - user ID

groupID - - group ID

Throws:

Exception