com.compoze.util
Class TemporaryFileClient

java.lang.Object
  com.compoze.util.TemporaryFileClient

public class TemporaryFileClient
extends java.lang.Object

This is a client that connects to a temporary file server to write some data. It may be used to gain access to a file on the machine where the temporary file server is running, which is useful when you wish to pass data to a program running on another machine that may only read from local resources. The process for connecting to the server is as follows:

1. Open the connection.
2. Read the header from the server and pass it an SHA digest of the password plus the 64 byte random challenge that it presents.
3. Tell the server whether we want to use a specific filename or if a generated name is OK.
4. Get the full filename from the server.
5. Write the data to the server.
6. Do any processing required with the remote file.
7. Optionally read data back from the server (in case the server wrote to it).
8. Notify the server that we're done with the file.
9. Close the connection.

Methods should be called in this order:

1. connect()
2. write()
3. ...(do any processing required with the remote file)
4. dataComplete();
5. getInputStream(); // optional to read data from server, close() in InputStream // closes the connection to the server
6. close(); // only if getInputStream was not used

When running the main() method in this class (primarily just for testing purposes), Java system properties may be specified to configure the client. The following table describes the effect of the different properties:

Property	Description	Required?	Default
password	Sets the password that the client uses to gain access to the server.	Yes	N/A
file	Sets a local file to send to the server.	Yes	N/A
ip	Sets the IP address of the server.	Yes	N/A
port	Sets the port of the server.	No	2112

See Also:

TemporaryFileServer

Field Summary

static int	COMMAND_ACCOUNTTOSID
static int	COMMAND_SIDTOACCOUNT
static int	COMMAND_TEMPFILE

Constructor Summary

TemporaryFileClient(java.net.InetAddress address, int iPort, java.lang.String sPassword, boolean bSSL)
Constructor.

TemporaryFileClient(java.net.InetAddress address, int iPort, java.lang.String sPassword, java.lang.String sRequestedFilename, boolean bSSL)
Constructor.

Method Summary

void	close() Closes the connection to the server, and indicates that the temporary file on the server is no longer in use.
void	connect() Connects to the server.
void	connect(int iCommand, java.lang.String sArgument) Connects to the server.
java.lang.String	dataComplete() Indicates that all data has been written and gets the filename on the server.
java.io.InputStream	getInputStream() Gets an InputStream to the data on the server.
static void	main(java.lang.String[] args) Main.
void	write(byte[] array) Writes a byte array (flush is performed).
void	write(byte[] array, int iOffset, int iLength) Writes a byte array (flush is performed).
void	write(java.io.File file) Writes data from a file.
void	write(java.io.InputStream is) Writes data from an InputStream.

Methods inherited from class java.lang.Object

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

Field Detail

COMMAND_TEMPFILE

public static final int COMMAND_TEMPFILE

See Also:

Constant Field Values

COMMAND_ACCOUNTTOSID

public static final int COMMAND_ACCOUNTTOSID

See Also:

Constant Field Values

COMMAND_SIDTOACCOUNT

public static final int COMMAND_SIDTOACCOUNT

See Also:

Constant Field Values

Constructor Detail

TemporaryFileClient

public TemporaryFileClient(java.net.InetAddress address,
                           int iPort,
                           java.lang.String sPassword,
                           boolean bSSL)
                    throws java.security.NoSuchAlgorithmException,
                           java.io.UnsupportedEncodingException

Constructor. Uses a default filename on the server.

Parameters:

address - the IP address of the server

iPort - the server port

sPassword - the server password

Throws:

java.security.NoSuchAlgorithmException - if algorithm not supported

java.io.UnsupportedEncodingException - if UTF-8 not supported

TemporaryFileClient

public TemporaryFileClient(java.net.InetAddress address,
                           int iPort,
                           java.lang.String sPassword,
                           java.lang.String sRequestedFilename,
                           boolean bSSL)
                    throws java.security.NoSuchAlgorithmException,
                           java.io.UnsupportedEncodingException

Constructor.

Parameters:

address - the IP address of the server

iPort - the server port

sPassword - the server password

sRequestedFilename - the filename to request that the server use

Throws:

java.security.NoSuchAlgorithmException - if algorithm not supported

java.io.UnsupportedEncodingException - if UTF-8 not supported

Method Detail

connect

public void connect()
             throws java.io.IOException,
                    java.security.NoSuchAlgorithmException,
                    java.lang.ClassNotFoundException

Connects to the server.

Parameters:

iCommand - the command

Throws:

java.io.IOException - if an i/o error occurred

java.security.NoSuchAlgorithmException - if the algorithm does not exist

java.lang.ClassNotFoundException - if the server sent an invalid class (should never happen)

connect

public void connect(int iCommand,
                    java.lang.String sArgument)
             throws java.io.IOException,
                    java.security.NoSuchAlgorithmException,
                    java.lang.ClassNotFoundException

Connects to the server.

Parameters:

iCommand - the command

sArgument - argument to the command

Throws:

java.io.IOException - if an i/o error occurred

java.security.NoSuchAlgorithmException - if the algorithm does not exist

java.lang.ClassNotFoundException - if the server sent an invalid class (should never happen)

write

public void write(java.io.File file)
           throws java.io.IOException

Writes data from a file. Must be connected.

Parameters:

file - the file to write

Throws:

java.io.IOException - if an i/o error occurred

write

public void write(java.io.InputStream is)
           throws java.io.IOException

Writes data from an InputStream. Must be connected.

Parameters:

is - the InputStream to read data from

Throws:

java.io.IOException - if an i/o error occurred

write

public void write(byte[] array)
           throws java.io.IOException

Writes a byte array (flush is performed). Must be connected.

Parameters:

array - the array to write, or null to write no data

Throws:

java.io.IOException - if an i/o error occurred

write

public void write(byte[] array,
                  int iOffset,
                  int iLength)
           throws java.io.IOException

Writes a byte array (flush is performed). Must be connected.

Parameters:

array - the array to write, or null to write no data

iOffset - the offset in the array to write from

iLength - the number of bytes to write

Throws:

java.io.IOException - if an i/o error occurred

dataComplete

public java.lang.String dataComplete()
                              throws java.io.IOException

Indicates that all data has been written and gets the filename on the server.

Returns:

the name of the file on the server for the TEMPFILE command, or some other response for another command

Throws:

java.io.IOException - if an i/o error occurred, or the server command failed for some other reason

getInputStream

public java.io.InputStream getInputStream()
                                   throws java.io.IOException

Gets an InputStream to the data on the server. This method may be called after dataComplete to get the data from the server. However, when the InputStream is closed the connection to the server is closed, so close must be called.

Returns:

an InputStream to the data

Throws:

java.io.IOException - if an i/o error occurred

close

public void close()

Closes the connection to the server, and indicates that the temporary file on the server is no longer in use.

main

public static void main(java.lang.String[] args)

Main.

Parameters:

args - command line arguments