com.novell.ldap.LDAPControl Maven / Gradle / Ivy
/* **************************************************************************
* $OpenLDAP: pkg/jldap/com/novell/ldap/LDAPControl.java,v 1.41 2004/08/25 07:39:50 sunilk Exp $
*
* Copyright (C) 1999, 2000, 2001 Novell, Inc. All Rights Reserved.
*
* THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND
* TREATIES. USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT
* TO VERSION 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS
* AVAILABLE AT HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE"
* IN THE TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION
* OF THIS WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP
* PUBLIC LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT
* THE PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
******************************************************************************/
package com.novell.ldap;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.Externalizable;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import com.novell.ldap.asn1.ASN1Boolean;
import com.novell.ldap.asn1.ASN1OctetString;
import com.novell.ldap.client.RespControlVector;
import com.novell.ldap.rfc2251.RfcControl;
import com.novell.ldap.rfc2251.RfcLDAPOID;
import com.novell.ldap.util.Base64;
import com.novell.ldap.util.LDAPXMLHandler;
import com.novell.ldap.util.SAXEventMultiplexer;
import com.novell.ldap.util.ValueXMLhandler;
/**
* Encapsulates optional additional parameters or constraints to be applied to
* an LDAP operation.
*
* When included with LDAPConstraints or LDAPSearchConstraints
* on an LDAPConnection or with a specific operation request, it is
* sent to the server along with operation requests.
*
* @see LDAPConnection#getResponseControls
* @see LDAPSearchConstraints#getControls
* @see LDAPSearchConstraints#setControls
*/
public class LDAPControl implements Cloneable,Externalizable {
private static RespControlVector registeredControls =
new RespControlVector(5, 5);
private RfcControl control; // An RFC 2251 Control
/**
* This constructor was added to support default Serialization
*
*/
public LDAPControl()
{
super();
}
/**
* Constructs a new LDAPControl object using the specified values.
*
* @param oid The OID of the control, as a dotted string.
*
* @param critical True if the LDAP operation should be discarded if
* the control is not supported. False if
* the operation can be processed without the control.
*
* @param values The control-specific data.
*/
public LDAPControl(String oid, boolean critical, byte[] values)
{
if( oid == null) {
throw new IllegalArgumentException("An OID must be specified");
}
if( values == null) {
control = new RfcControl( new RfcLDAPOID(oid),
new ASN1Boolean(critical));
} else {
control = new RfcControl( new RfcLDAPOID(oid),
new ASN1Boolean(critical),
new ASN1OctetString(values));
}
return;
}
/**
* Create an LDAPControl from an existing control.
*/
protected LDAPControl(RfcControl control)
{
this.control = control;
return;
}
/**
* Returns a copy of the current LDAPControl object.
*
* @return A copy of the current LDAPControl object.
*/
public Object clone()
{
LDAPControl cont;
try {
cont = (LDAPControl)super.clone();
} catch( CloneNotSupportedException ce) {
throw new RuntimeException("Internal error, cannot create clone");
}
byte[] vals = this.getValue();
byte[] twin = null;
if( vals != null) {
//is this necessary?
// Yes even though the contructor above allocates a
// new ASN1OctetString, vals in that constuctor
// is only copied by reference
twin = new byte[vals.length];
for(int i = 0; i < vals.length; i++){
twin[i]=vals[i];
}
cont.control = new RfcControl( new RfcLDAPOID(getID()),
new ASN1Boolean(isCritical()),
new ASN1OctetString(twin));
}
return cont;
}
/**
* Returns the identifier of the control.
*
* @return The object ID of the control.
*/
public String getID()
{
return new String(control.getControlType().stringValue());
}
/**
* Returns the control-specific data of the object.
*
* @return The control-specific data of the object as a byte array,
* or null if the control has no data.
*/
public byte[] getValue()
{
byte[] result = null;
ASN1OctetString val = control.getControlValue();
if( val != null) {
result = val.byteValue();
}
return result;
}
/**
* Sets the control-specific data of the object. This method is for
* use by an extension of LDAPControl.
*/
protected void setValue(byte[] controlValue)
{
control.setControlValue(new ASN1OctetString(controlValue));
return;
}
/**
* Returns whether the control is critical for the operation.
*
* @return Returns true if the control must be supported for an associated
* operation to be executed, and false if the control is not required for
* the operation.
*/
public boolean isCritical()
{
return control.getCriticality().booleanValue();
}
/**
* Registers a class to be instantiated on receipt of a control with the
* given OID.
*
* Any previous registration for the OID is overridden. The
* controlClass must be an extension of LDAPControl.
*
* @param oid The object identifier of the control.
*
* @param controlClass A class which can instantiate an LDAPControl.
*/
public static void register(String oid, Class controlClass)
{
registeredControls.registerResponseControl(oid, controlClass);
return;
}
/* package */
static RespControlVector getRegisteredControls()
{
return registeredControls;
}
/**
* Returns the RFC 2251 Control object.
*
* @return An ASN.1 RFC 2251 Control.
*/
/*package*/ final RfcControl getASN1Object()
{
return control;
}
void newLine(int indentTabs,java.io.Writer out) throws IOException
{
String tabString = " ";
out.write("\n");
for (int i=0; i< indentTabs; i++){
out.write(tabString);
}
return;
}
/**
* This method does DSML serialization of the instance.
*
* @param oout Outputstream where the serialzed data has to be written
*
* @throws IOException if write fails on OutputStream
*/
public void writeDSML(java.io.OutputStream oout) throws IOException
{
java.io.Writer out=new java.io.OutputStreamWriter(oout,"UTF-8");
int indent=0;
// newLine(indent,out);
out.write("");
out.write(Base64.encode(value));
out.write(" ");
newLine(indent,out);
out.write("");
}
out.close();
}
/**
* This method is used to deserialize the DSML encoded representation of
* this class.
* @param input InputStream for the DSML formatted data.
* @return Deserialized form of this class.
* @throws IOException when serialization fails.
*/
public static Object readDSML(InputStream input) throws IOException {
SAXEventMultiplexer xmlreader = new SAXEventMultiplexer();
xmlreader.setLDAPXMLHandler(getXMLHandler("control", null));
return (LDAPControl) xmlreader.parseXML(input);
}
/**
* This method return the LDAPHandler which handles the XML (DSML) tags
* for this class
* @param tagname Name of the Root tag used to represent this class.
* @param parenthandler Parent LDAPXMLHandler for this tag.
* @return LDAPXMLHandler to handle this element.
*/
static LDAPXMLHandler getXMLHandler(
String tagname,
LDAPXMLHandler parenthandler) {
return new LDAPXMLHandler(tagname, parenthandler) {
String oid;
boolean critical;
byte[] controlvalue;
protected void initHandler() {
//set value handler.
setchildelement(new ValueXMLhandler("controlValue", this));
}
protected void endElement() {
LDAPControl control = new LDAPControl(oid, critical, controlvalue);
setObject(control);
}
protected void addValue(String tag, Object value) {
if (tag.equals("controlValue")) {
controlvalue = (byte[]) value;
}
}
protected void handleAttributes(Attributes attributes)
throws SAXException {
oid = attributes.getValue("type");
if (oid == null) {
//Oid is mandatory.
throw new SAXException("type is mandatory for a Control");
}
critical = "true".equalsIgnoreCase(attributes.getValue("criticality"));
}
};
}
/**
* Returns a string representation of this class.
*
* @return The string representation of this class.
*/
public String toString()
{
StringBuffer result = new StringBuffer("LDAPControl: ");
result.append("((oid="+getID()+"");
result.append(",critical="+isCritical()+")");
result.append("(value="+getValue()+"))");
return result.toString();
}
/**
* Writes the object state to a stream in XML format
* @param out The ObjectOutput stream where the Object in XML format
* is being written to
* @throws IOException - If I/O errors occur
*/
public void writeExternal(ObjectOutput out) throws IOException
{
StringBuffer buff = new StringBuffer();
buff.append(ValueXMLhandler.newLine(0));
buff.append(ValueXMLhandler.newLine(0));
String header = "";
header += "*************************************************************************\n";
header += "** The encrypted data above and below is the Class definition and ******\n";
header += "** other data specific to Java Serialization Protocol. The data ********\n";
header += "** which is of most application specific interest is as follows... ******\n";
header += "*************************************************************************\n";
header += "****************** Start of application data ****************************\n";
header += "*************************************************************************\n";
buff.append(header);
buff.append(ValueXMLhandler.newLine(0));
buff.append("");
buff.append(Base64.encode(value));
buff.append(" ");
buff.append(ValueXMLhandler.newLine(0));
buff.append("");
}
buff.append(ValueXMLhandler.newLine(0));
buff.append(ValueXMLhandler.newLine(0));
String tail = "";
tail += "*************************************************************************\n";
tail += "****************** End of application data ******************************\n";
tail += "*************************************************************************\n";
buff.append(tail);
buff.append(ValueXMLhandler.newLine(0));
out.writeUTF(buff.toString());
}
/**
* Reads the serialized object from the underlying input stream.
* @param in The ObjectInput stream where the Serialized Object is being read from
* @throws IOException - If I/O errors occur
* @throws ClassNotFoundException - If the class for an object being restored
* cannot be found.
*/
public void readExternal(ObjectInput in)
throws IOException, ClassNotFoundException
{
String readData = in.readUTF();
String readProperties = readData.substring(readData.indexOf('<'),
(readData.lastIndexOf('>') + 1));
//Insert parsing logic here for separating whitespaces in non-text nodes
StringBuffer parsedBuff = new StringBuffer();
ValueXMLhandler.parseInput(readProperties, parsedBuff);
BufferedInputStream istream =
new BufferedInputStream(
new ByteArrayInputStream((parsedBuff.toString()).getBytes()));
LDAPControl readObject =
(LDAPControl)LDAPControl.readDSML(istream);
byte[] vals = readObject.getValue();
if( vals == null) {
this.control = new RfcControl( new RfcLDAPOID(readObject.getID()),
new ASN1Boolean(readObject.isCritical()));
} else {
control = new RfcControl( new RfcLDAPOID(readObject.getID()),
new ASN1Boolean(readObject.isCritical()),
new ASN1OctetString(vals));
}
//Garbage collect the readObject from readDSML()..
readObject = null;
}
}
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