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pjs/directory/java-sdk/ldapjdk/netscape/ldap/LDAPControl.java

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Java
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (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.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
package netscape.ldap;
import java.io.*;
import java.util.*;
import java.lang.reflect.*;
import netscape.ldap.ber.stream.*;
import netscape.ldap.client.*;
import netscape.ldap.util.*;
import netscape.ldap.controls.*;
/**
* Represents arbitrary control data that can be used with a
* a particular LDAP operation. LDAP controls are part of version 3
* of the LDAP protocol.
* <P>
*
* LDAP controls allow you to extend the functionality of
* an LDAP operation. For example, you can use an LDAP control
* for the search operation to sort search results on an LDAP server.
* <P>
*
* An LDAP control can be either a <B>server control</B> or
* a <B>client control</B>:
* <P>
* <UL>
* <LI><B>Server controls</B> can be sent to the LDAP server or returned
* by the server on any operation.
* <LI><B>Client controls</B> are intended to affect only the client side
* of the operation.
* </UL>
* <P>
*
* An LDAP control consists of the following information:
* <P>
* <UL>
* <LI>A unique object ID (OID) that identifies the control.<P>
* <LI>A &quot;criticality&quot; field, which indicates whether or
* not the control is critical to the operation. (If the control is
* critical to the operation and the server does not support the control,
* the server should not execute the operation.)<P>
* <LI>Data pertaining to the control.<P>
* </UL>
* <P>
*
* To determine which server controls are supported by a particular server,
* you need to search for the root DSE (DSA-specific entry, where DSA is
* another term for &quot;LDAP server&quot;) and find the values of the
* <CODE>supportedControl</CODE> attribute. This attribute contains the
* object IDs (OIDs) of the controls supported by this server.
* <P>
*
* The following section of code demonstrates how to get the list
* of the server controls supported by an LDAP server.
* <P>
*
* <PRE>
* public static void main( String[] args )
* {
* LDAPConnection ld = new LDAPConnection();
* try {
* String MY_HOST = "localhost";
* int MY_PORT = 389;
* ld.connect( MY_HOST, MY_PORT );
* try {
* ld.authenticate( 3, "cn=Directory Manager", "23skidoo" );
* } catch( LDAPException e ) {
* System.out.println( "LDAP server does not support v3." );
* ld.disconnect();
* System.exit(1);
* }
*
* String MY_FILT = "(objectclass=*)";
* String MY_BASE = "";
* String getAttrs[] = { "supportedControl" };
* LDAPSearchResults res = ld.search( MY_BASE,
* LDAPConnection.SCOPE_BASE, MY_FILT, getAttrs, false );
*
* while ( res.hasMoreElements() ) {
* LDAPEntry findEntry = (LDAPEntry)res.nextElement();
* LDAPAttributeSet findAttrs = findEntry.getAttributeSet();
* Enumeration enumAttrs = findAttrs.getAttributes();
*
* while ( enumAttrs.hasMoreElements() ) {
* LDAPAttribute anAttr = (LDAPAttribute)enumAttrs.nextElement();
* String attrName = anAttr.getName();
* System.out.println( attrName );
* Enumeration enumVals = anAttr.getStringValues();
*
* while ( enumVals.hasMoreElements() ) {
* String aVal = ( String )enumVals.nextElement();
* System.out.println( "\t" + aVal );
* }
* }
* }
* }
* catch( LDAPException e ) {
* System.out.println( "Error: " + e.toString() );
* }
* try {
* ld.disconnect();
* }
* catch( LDAPException e ) {
* System.exit(1);
* }
* System.exit(0);
* }
* </PRE>
* <P>
*
* If you compile and run this example against an LDAP server that
* supports v3 of the protocol, you might receive the following results:
* <P>
*
* <PRE>
* supportedcontrol
* 2.16.840.1.113730.3.4.2
* 2.16.840.1.113730.3.4.3
* 2.16.840.1.113730.3.4.4
* 2.16.840.1.113730.3.4.5
* 1.2.840.113556.1.4.473
* </PRE>
* <P>
*
* For more information on LDAP controls, see the Internet-Draft on
* the LDAP v3 protocol. (Note that this internet draft is still a
* work in progress. You can find the latest draft at the <A
* HREF="http://www.ietf.cnri.reston.va.us/html.charters/asid-charter.html"
* TARGET="_blank">ASID home page</A>.
* <P>
*
* @version 1.0
* @see netscape.ldap.LDAPv3#CLIENTCONTROLS
* @see netscape.ldap.LDAPv3#SERVERCONTROLS
* @see netscape.ldap.LDAPConnection#search(java.lang.String, int, java.lang.String, java.lang.String[], boolean)
* @see netscape.ldap.LDAPConnection#getOption
* @see netscape.ldap.LDAPConnection#setOption
* @see netscape.ldap.LDAPConnection#getResponseControls
* @see netscape.ldap.LDAPConstraints#getClientControls
* @see netscape.ldap.LDAPConstraints#getServerControls
* @see netscape.ldap.LDAPConstraints#setClientControls
* @see netscape.ldap.LDAPConstraints#setServerControls
*/
public class LDAPControl implements Cloneable, java.io.Serializable {
static final long serialVersionUID = 5149887553272603753L;
public final static String MANAGEDSAIT = "2.16.840.1.113730.3.4.2";
/* Password information sent back to client */
public final static String PWEXPIRED = "2.16.840.1.113730.3.4.4";
public final static String PWEXPIRING = "2.16.840.1.113730.3.4.5";
/**
* Default constructor for the <CODE>LDAPControl</CODE> class.
*/
public LDAPControl()
{
}
/**
* Constructs a new <CODE>LDAPControl</CODE> object using the
* specified object ID (OID), &quot;criticality&quot; field, and
* data to be used by the control.
* <P>
*
* @param id the object ID (OID) identifying the control
* @param critical <CODE>true</CODE> if the LDAP operation should be
* cancelled when the server does not support this control (in other
* words, this control is critical to the LDAP operation)
* @param vals control-specific data
* @see netscape.ldap.LDAPConstraints#setClientControls
* @see netscape.ldap.LDAPConstraints#setServerControls
*/
public LDAPControl(String id,
boolean critical,
byte vals[]) {
m_oid = id;
m_critical = critical;
m_value = vals;
}
/**
* Gets the object ID (OID) of the control.
* @return object ID (OID) of the control.
*/
public String getID() {
return m_oid;
}
/**
* Specifies whether or not the control is critical to the LDAP operation.
* @return <CODE>true</CODE> if the LDAP operation should be cancelled when
* the server does not support this control.
*/
public boolean isCritical() {
return m_critical;
}
/**
* Gets the data in the control.
* @return the data in the control as a byte array.
*/
public byte[] getValue() {
return m_value;
}
/**
* Gets the ber representation of control.
* @return ber representation of control.
*/
BERElement getBERElement() {
BERSequence seq = new BERSequence();
seq.addElement(new BEROctetString (m_oid));
seq.addElement(new BERBoolean (m_critical));
if ( (m_value == null) || (m_value.length < 1) )
seq.addElement(new BEROctetString ((byte[])null));
else {
seq.addElement(new BEROctetString (m_value, 0, m_value.length));
}
return seq;
}
/**
* Associates a class with an oid. This class must be an extension of
* <CODE>LDAPControl</CODE>, and should implement the <CODE>LDAPControl(
* String oid, boolean critical, byte[] value)</CODE> constructor to
* instantiate the control.
* @param oid the string representation of the oid
* @param controlClass the class that instantatiates the control associated
* with oid
* @exception netscape.ldap.LDAPException If the class parameter is not
* a subclass of <CODE>LDAPControl</CODE> or the class parameter does not
* implement the <CODE>LDAPControl(String oid, boolean critical, byte[] value)
* </CODE> constructor.
*/
public static void register(String oid, Class controlClass) throws
LDAPException {
if (controlClass == null) {
return;
}
// 1. make sure controlClass is a subclass of LDAPControl
Class superClass = controlClass;
while (superClass != LDAPControl.class && superClass != null) {
superClass = superClass.getSuperclass();
}
if (superClass == null)
throw new LDAPException("controlClass must be a subclass of " +
"LDAPControl", LDAPException.PARAM_ERROR);
// 2. make sure controlClass has the proper constructor
Class[] cparams = { String.class, boolean.class, byte[].class };
try {
controlClass.getConstructor(cparams);
} catch (NoSuchMethodException e) {
throw new LDAPException("controlClass does not implement the " +
"correct contstructor",
LDAPException.PARAM_ERROR);
}
// 3. check if the hash table exists
if (m_controlClassHash == null) {
m_controlClassHash = new Hashtable();
}
// 4. add the controlClass
m_controlClassHash.put(oid, controlClass);
}
/**
* Returns the <CODE>Class</CODE> that has been registered to oid.
* @param oid a String that associates the control class to a control
* @return a <CODE>Class</CODE> that can instantiate a control of the
* type specified by oid.
* @see netscape.ldap.LDAPControl#register
*
*/
protected static Class lookupControlClass(String oid) {
if (m_controlClassHash == null) {
return null;
}
return (Class)m_controlClassHash.get(oid);
}
/**
* Returns a <CODE>LDAPControl</CODE> object instantiated by the Class
* associated by <CODE>LDAPControl.register</CODE> to the oid. If
* no Class is found for the given control, or an exception occurs when
* attempting to instantiate the control, a basic <CODE>LDAPControl</CODE>
* is instantiated using the parameters.
* @param oid the oid of the control to instantiate
* @param critical <CODE>true</CODE> if this is a critical control
* @param value the byte value for the control
* @return a newly instantiated <CODE>LDAPControl</CODE>.
* @see netscape.ldap.LDAPControl#register
*/
protected static LDAPControl createControl(String oid, boolean critical,
byte[] value) {
Class controlClass = lookupControlClass(oid);
if (controlClass == null) {
return new LDAPControl(oid, critical, value);
}
Class[] cparams = { String.class, boolean.class, byte[].class };
Constructor creator = null;
try {
creator = controlClass.getConstructor(cparams);
} catch (NoSuchMethodException e) {
//shouldn't happen, but...
System.err.println("Caught java.lang.NoSuchMethodException while" +
" attempting to instantiate a control of type " +
oid);
return new LDAPControl(oid, critical, value);
}
Object[] oparams = { oid, new Boolean(critical), value } ;
LDAPControl returnControl = null;
try {
returnControl = (LDAPControl)creator.newInstance(oparams);
} catch (Exception e) {
String eString = null;
if (e instanceof InvocationTargetException) {
eString = ((InvocationTargetException)
e).getTargetException().toString();
} else {
eString = e.toString();
}
System.err.println("Caught " + eString + " while attempting to" +
" instantiate a control of type " +
oid);
returnControl = new LDAPControl(oid, critical, value);
}
return returnControl;
}
/**
* Returns a <CODE>LDAPControl</CODE> object instantiated by the Class
* associated by <CODE>LDAPControl.register</CODE> to the oid. If
* no Class is found for the given control, or an exception occurs when
* attempting to instantiate the control, a basic <CODE>LDAPControl</CODE>
* is instantiated using the parameters.
* @param el the <CODE>BERElement</CODE> containing the control
* @return a newly instantiated <CODE>LDAPControl</CODE>.
* @see netscape.ldap.LPAPControl#register
*
* Note:
* This code was extracted from <CODE>JDAPControl(BERElement el)</CODE>
* constructor.
*/
static LDAPControl parseControl(BERElement el) {
BERSequence s = (BERSequence)el;
String oid = null;
boolean critical = false;
byte[] value = null;
try{
oid = new String(((BEROctetString)s.elementAt(0)).getValue(), "UTF8");
} catch(Throwable x) {}
Object obj = s.elementAt(1);
if (obj instanceof BERBoolean) {
critical = ((BERBoolean)obj).getValue();
}
else {
value = ((BEROctetString)obj).getValue();
}
if (s.size() >= 3) {
value = ((BEROctetString)s.elementAt(2)).getValue();
}
return createControl(oid, critical, value);
}
/**
* Instantiates all of the controls contained within the LDAP message
* fragment specified by data and returns them in an <CODE>LDAPControl</CODE>
* array. This fragment can be either the entire LDAP message or just the
* control section of the message.
* <P>
* If an exception occurs when instantiating a control, that control is
* returned as a basic <CODE>LDAPControl</CODE>.
* @param data the LDAP message fragment in raw BER format
* @return an <CODE>LDAPControl</CODE> array containing all of the controls
* from the message fragment.
* @exception java.lang.IOException If the data passed to this method
* is not a valid LDAP message fragment.
* @see netscape.ldap.LDAPControl#register
*/
public static LDAPControl[] newInstance(byte[] data) throws IOException {
int[] bread = { 0 };
BERElement el = BERElement.getElement(new JDAPBERTagDecoder(),
new ByteArrayInputStream(data),
bread);
LDAPControl[] jc = null;
try {
// see if data is a LDAP message
LDAPMessage msg = LDAPMessage.parseMessage(el);
return msg.getControls();
} catch (IOException e) {
// that didn't work; let's see if its just the controls
BERTag tag = (BERTag)el;
if ( tag.getTag() == (BERTag.CONSTRUCTED|BERTag.CONTEXT|0) ) {
BERSequence controls = (BERSequence)tag.getValue();
jc = new LDAPControl[controls.size()];
for (int i = 0; i < controls.size(); i++) {
jc[i] = parseControl(controls.elementAt(i));
}
}
}
return jc;
}
/**
* Creates a copy of the control.
* @return copy of the control.
*/
public Object clone() {
byte[] vals = null;
if ( m_value != null ) {
vals = new byte[m_value.length];
for( int i = 0; i < m_value.length; i++ )
vals[i] = m_value[i];
}
LDAPControl control = new LDAPControl( m_oid, m_critical, vals );
return control;
}
/**
* Create a "flattened" BER encoding from a BER,
* and return it as a byte array.
* @param ber a BER encoded sequence
* @return the byte array of encoded data.
*/
protected byte[] flattenBER( BERSequence ber ) {
/* Suck out the data and return it */
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
try {
ber.write( outStream );
} catch ( IOException e ) {
return null;
}
return outStream.toByteArray();
}
/**
* Return a string representation of the control for debugging
*
* @return a string representation of the control.
*/
public String toString() {
String s = getID() + ' ' + isCritical();
if ( m_value != null ) {
s += ' ' + LDIF.toPrintableString( m_value );
}
return "LDAPControl {" + s + '}';
}
private String m_oid;
protected boolean m_critical = false;
protected byte[] m_value = null;
static private Hashtable m_controlClassHash = null;
static {
try {
LDAPControl.register( LDAPPasswordExpiringControl.EXPIRING,
LDAPPasswordExpiringControl.class );
LDAPControl.register( LDAPPasswordExpiredControl.EXPIRED,
LDAPPasswordExpiredControl.class );
LDAPControl.register( LDAPEntryChangeControl.ENTRYCHANGED,
LDAPEntryChangeControl.class );
LDAPControl.register( LDAPSortControl.SORTRESPONSE,
LDAPSortControl.class );
LDAPControl.register( LDAPVirtualListResponse.VIRTUALLISTRESPONSE,
LDAPVirtualListResponse.class );
} catch (LDAPException e) {
}
}
}
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