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/*
* Copyright 2008-2021 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright 2008-2021 Ping Identity Corporation
*
* Licensed 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.
*/
/*
* Copyright (C) 2008-2021 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.ldap.sdk.unboundidds.controls;
import java.util.ArrayList;
import com.unboundid.asn1.ASN1Boolean;
import com.unboundid.asn1.ASN1Element;
import com.unboundid.asn1.ASN1OctetString;
import com.unboundid.asn1.ASN1Sequence;
import com.unboundid.ldap.sdk.Control;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.util.Debug;
import com.unboundid.util.NotMutable;
import com.unboundid.util.NotNull;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import com.unboundid.util.Validator;
import static com.unboundid.ldap.sdk.unboundidds.controls.ControlMessages.*;
/**
* This class provides a request control which may be used to request that the
* associated request be routed to a specific server. It is primarily intended
* for use when the request will pass through a Directory Proxy Server to
* indicate that which backend server should be used to process the request.
* The server ID for the server to use may be obtained using the
* {@link GetServerIDRequestControl}.
*
*
* NOTE: This class, and other classes within the
* {@code com.unboundid.ldap.sdk.unboundidds} package structure, are only
* supported for use against Ping Identity, UnboundID, and
* Nokia/Alcatel-Lucent 8661 server products. These classes provide support
* for proprietary functionality or for external specifications that are not
* considered stable or mature enough to be guaranteed to work in an
* interoperable way with other types of LDAP servers.
*
*
* If the request is processed successfully, then the result should include a
* {@link GetServerIDResponseControl} with the server ID of the server that was
* used to process the request. It may or may not be the same as the server ID
* included in the request control, depending on whether an alternate server was
* determined to be better suited to handle the request.
*
* The criticality for this control may be either {@code true} or {@code false}.
* It must have a value with the following encoding:
*
* The following example demonstrates the process of performing a search to
* retrieve an entry using the get server ID request control and then sending a
* modify request to that same server using the route to server request control.
*
* // Perform a search to find an entry, and use the get server ID request
* // control to figure out which server actually processed the request.
* SearchRequest searchRequest = new SearchRequest("dc=example,dc=com",
* SearchScope.BASE, Filter.createPresenceFilter("objectClass"),
* "description");
* searchRequest.addControl(new GetServerIDRequestControl());
*
* SearchResultEntry entry = connection.searchForEntry(searchRequest);
* GetServerIDResponseControl serverIDControl =
* GetServerIDResponseControl.get(entry);
* String serverID = serverIDControl.getServerID();
*
* // Send a modify request to update the target entry, and include the route
* // to server request control to request that the change be processed on the
* // same server that processed the request.
* ModifyRequest modifyRequest = new ModifyRequest("dc=example,dc=com",
* new Modification(ModificationType.REPLACE, "description",
* "new description value"));
* modifyRequest.addControl(new RouteToServerRequestControl(false, serverID,
* true, true, true));
* LDAPResult modifyResult = connection.modify(modifyRequest);
*
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class RouteToServerRequestControl
extends Control
{
/**
* The OID (1.3.6.1.4.1.30221.2.5.16) for the route to server request control.
*/
@NotNull public static final String ROUTE_TO_SERVER_REQUEST_OID =
"1.3.6.1.4.1.30221.2.5.16";
/**
* The BER type for the server ID element.
*/
private static final byte TYPE_SERVER_ID = (byte) 0x80;
/**
* The BER type for the allow alternate server element.
*/
private static final byte TYPE_ALLOW_ALTERNATE_SERVER = (byte) 0x81;
/**
* The BER type for the prefer local server element.
*/
private static final byte TYPE_PREFER_LOCAL_SERVER = (byte) 0x82;
/**
* The BER type for the prefer non-degraded server element.
*/
private static final byte TYPE_PREFER_NON_DEGRADED_SERVER = (byte) 0x83;
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = 2100638364623466061L;
// Indicates whether the associated request may be processed by an alternate
// server if the server specified by the given server ID is not suitable for
// use.
private final boolean allowAlternateServer;
// Indicates whether the associated request should may be routed to an
// alternate server if the target server is more remote than an alternate
// server.
private final boolean preferLocalServer;
// Indicates whether the associated request should be routed to an alternate
// server if the target server is in a degraded state and an alternate server
// is not in a degraded state.
private final boolean preferNonDegradedServer;
// The server ID of the server to which the request should be sent.
@NotNull private final String serverID;
/**
* Creates a new route to server request control with the provided
* information.
*
* @param isCritical Indicates whether this control should be
* considered critical.
* @param serverID The server ID for the server to which the
* request should be sent. It must not be
* {@code null}.
* @param allowAlternateServer Indicates whether the request may be
* routed to an alternate server in the
* event that the target server is not known,
* is not available, or is otherwise unsuited
* for use. If this has a value of
* {@code false} and the target server is
* unknown or unavailable, then the
* associated operation will be rejected. If
* this has a value of {@code true}, then an
* intermediate Directory Proxy Server may be
* allowed to route the request to a
* different server if deemed desirable or
* necessary.
* @param preferLocalServer Indicates whether the associated request
* may be routed to an alternate server if
* the target server is in a remote location
* and a suitable alternate server is
* available locally. This will only be used
* if {@code allowAlternateServer} is
* {@code true}.
* @param preferNonDegradedServer Indicates whether the associated request
* may be routed to an alternate server if
* the target server is in a degraded state
* and an alternate server is not in a
* degraded state. This will only be used if
* {@code allowAlternateServer} is
* {@code true}.
*/
public RouteToServerRequestControl(final boolean isCritical,
@NotNull final String serverID,
final boolean allowAlternateServer,
final boolean preferLocalServer,
final boolean preferNonDegradedServer)
{
super(ROUTE_TO_SERVER_REQUEST_OID, isCritical,
encodeValue(serverID, allowAlternateServer, preferLocalServer,
preferNonDegradedServer));
this.serverID = serverID;
this.allowAlternateServer = allowAlternateServer;
this.preferLocalServer = (allowAlternateServer && preferLocalServer);
this.preferNonDegradedServer =
(allowAlternateServer && preferNonDegradedServer);
}
/**
* Creates a new route to server request control which is decoded from the
* provided generic control.
*
* @param control The generic control to be decoded as a route to server
* request control.
*
* @throws LDAPException If the provided control cannot be decoded as a
* route to server request control.
*/
public RouteToServerRequestControl(@NotNull final Control control)
throws LDAPException
{
super(control);
final ASN1OctetString value = control.getValue();
if (value == null)
{
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_ROUTE_TO_SERVER_REQUEST_MISSING_VALUE.get());
}
final ASN1Sequence valueSequence;
try
{
valueSequence = ASN1Sequence.decodeAsSequence(value.getValue());
}
catch (final Exception e)
{
Debug.debugException(e);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_ROUTE_TO_SERVER_REQUEST_VALUE_NOT_SEQUENCE.get(
StaticUtils.getExceptionMessage(e)), e);
}
try
{
final ASN1Element[] elements = valueSequence.elements();
serverID = ASN1OctetString.decodeAsOctetString(elements[0]).stringValue();
allowAlternateServer =
ASN1Boolean.decodeAsBoolean(elements[1]).booleanValue();
boolean preferLocal = allowAlternateServer;
boolean preferNonDegraded = allowAlternateServer;
for (int i=2; i < elements.length; i++)
{
switch (elements[i].getType())
{
case TYPE_PREFER_LOCAL_SERVER:
preferLocal = allowAlternateServer &&
ASN1Boolean.decodeAsBoolean(elements[i]).booleanValue();
break;
case TYPE_PREFER_NON_DEGRADED_SERVER:
preferNonDegraded = allowAlternateServer &&
ASN1Boolean.decodeAsBoolean(elements[i]).booleanValue();
break;
default:
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_ROUTE_TO_SERVER_REQUEST_INVALID_VALUE_TYPE.get(
StaticUtils.toHex(elements[i].getType())));
}
}
preferLocalServer = preferLocal;
preferNonDegradedServer = preferNonDegraded;
}
catch (final LDAPException le)
{
Debug.debugException(le);
throw le;
}
catch (final Exception e)
{
Debug.debugException(e);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_ROUTE_TO_SERVER_REQUEST_ERROR_PARSING_VALUE.get(
StaticUtils.getExceptionMessage(e)), e);
}
}
/**
* Encodes the provided information into a form suitable for use as the value
* of this control.
*
* @param serverID The server ID for the server to which the
* request should be sent. It must not be
* {@code null}.
* @param allowAlternateServer Indicates whether the request may be
* routed to an alternate server in the
* event that the target server is not known,
* is not available, or is otherwise unsuited
* for use. If this has a value of
* {@code false} and the target server is
* unknown or unavailable, then the
* associated operation will be rejected. If
* this has a value of {@code true}, then an
* intermediate Directory Proxy Server may be
* allowed to route the request to a
* different server if deemed desirable or
* necessary.
* @param preferLocalServer Indicates whether the associated request
* may be routed to an alternate server if
* the target server is in a remote location
* and a suitable alternate server is
* available locally. This will only be used
* if {@code allowAlternateServer} is
* {@code true}.
* @param preferNonDegradedServer Indicates whether the associated request
* may be routed to an alternate server if
* the target server is in a degraded state
* and an alternate server is not in a
* degraded state. This will only be used if
* {@code allowAlternateServer} is
* {@code true}.
*
* @return The encoded value for this control.
*/
@NotNull()
private static ASN1OctetString encodeValue(@NotNull final String serverID,
final boolean allowAlternateServer,
final boolean preferLocalServer,
final boolean preferNonDegradedServer)
{
Validator.ensureNotNull(serverID);
final ArrayList elements = new ArrayList<>(4);
elements.add(new ASN1OctetString(TYPE_SERVER_ID, serverID));
elements.add(
new ASN1Boolean(TYPE_ALLOW_ALTERNATE_SERVER, allowAlternateServer));
if (allowAlternateServer && (! preferLocalServer))
{
elements.add(new ASN1Boolean(TYPE_PREFER_LOCAL_SERVER, false));
}
if (allowAlternateServer && (! preferNonDegradedServer))
{
elements.add(new ASN1Boolean(TYPE_PREFER_NON_DEGRADED_SERVER, false));
}
return new ASN1OctetString(new ASN1Sequence(elements).encode());
}
/**
* Retrieves the server ID for the server to which the request should be sent.
*
* @return The server ID for the server to which the request should be sent.
*/
@NotNull()
public String getServerID()
{
return serverID;
}
/**
* Indicates whether the request may be routed to an alternate server if the
* target server is unknown, unavailable, or otherwise unsuited for use.
*
* @return {@code true} if the request may be routed to an alternate server
* if the target server is not suitable for use, or {@code false} if
* the operation should be rejected if it cannot be routed to the
* target server.
*/
public boolean allowAlternateServer()
{
return allowAlternateServer;
}
/**
* Indicates whether the request may be routed to an alternate server if the
* target server is nonlocal and a suitable server is available locally. This
* will only return {@code true} if {@link #allowAlternateServer} also returns
* {@code true}.
*
* @return {@code true} if the request may be routed to a suitable local
* server if the target server is nonlocal, or {@code false} if the
* nonlocal target server should still be used.
*/
public boolean preferLocalServer()
{
return preferLocalServer;
}
/**
* Indicates whether the request may be routed to an alternate server if the
* target server is in a degraded state and a suitable non-degraded server is
* available. This will only return {@code true} if
* {@link #allowAlternateServer} also returns {@code true}.
*
* @return {@code true} if the request may be routed to a suitable
* non-degraded server if the target server is degraded, or
* {@code false} if the degraded target server should still be used.
*/
public boolean preferNonDegradedServer()
{
return preferNonDegradedServer;
}
/**
* {@inheritDoc}
*/
@Override()
@NotNull()
public String getControlName()
{
return INFO_CONTROL_NAME_ROUTE_TO_SERVER_REQUEST.get();
}
/**
* {@inheritDoc}
*/
@Override()
public void toString(@NotNull final StringBuilder buffer)
{
buffer.append("RouteToServerRequestControl(isCritical=");
buffer.append(isCritical());
buffer.append(", serverID='");
buffer.append(serverID);
buffer.append("', allowAlternateServer=");
buffer.append(allowAlternateServer);
buffer.append(", preferLocalServer=");
buffer.append(preferLocalServer);
buffer.append(", preferNonDegradedServer=");
buffer.append(preferNonDegradedServer);
buffer.append(')');
}
}
