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package com.unboundid.directory.sdk.examples;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.regex.Pattern;
import com.unboundid.directory.sdk.sync.api.LDAPSyncDestinationPlugin;
import com.unboundid.directory.sdk.sync.config.LDAPSyncDestinationPluginConfig;
import com.unboundid.directory.sdk.sync.types.PostStepResult;
import com.unboundid.directory.sdk.sync.types.PreStepResult;
import com.unboundid.directory.sdk.sync.types.SyncOperation;
import com.unboundid.directory.sdk.sync.types.SyncServerContext;
import com.unboundid.ldap.sdk.Attribute;
import com.unboundid.ldap.sdk.DN;
import com.unboundid.ldap.sdk.DeleteRequest;
import com.unboundid.ldap.sdk.Entry;
import com.unboundid.ldap.sdk.Filter;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPInterface;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.ldap.sdk.SearchRequest;
import com.unboundid.ldap.sdk.SearchResult;
import com.unboundid.ldap.sdk.SearchResultEntry;
import com.unboundid.ldap.sdk.SearchScope;
import com.unboundid.ldap.sdk.Modification;
import com.unboundid.ldap.sdk.UpdatableLDAPRequest;
import com.unboundid.ldap.sdk.unboundidds.controls.SoftDeleteRequestControl;
import com.unboundid.util.args.ArgumentException;
import com.unboundid.util.args.ArgumentParser;
import com.unboundid.util.args.DNArgument;
import com.unboundid.util.args.StringArgument;
/**
* This class provides a simple example of an LDAP sync destination plugin
* which manipulates an attribute that stores a reference to another entry.
* In the LDAP destination server, the reference is stored as a DN, but the
* source instance (possible a relational database) stores the reference
* using a key for the referenced entry (e.g. uid).
* <UL>
* <LI>{@code postFetch} -- After an entry is returned from the source, the
* key value in the referenced attribute must be retrieved by doing
* a search for the referenced entry.
* </LI>
* <LI>{@code preCreate} -- When an entry is created at the destination,
* the key attribute values in the reference attribute must be replaced
* with DNs (i.e. the reverse of what happens in {@code postFetch} by
* retrieving the referenced entries from the destination server using
* the key attribute value.
* </LI>
* <LI>{@code preModify} -- If the reference attribute is modified,
* the key attribute values in the reference attribute must be replaced
* with DNs (i.e. the reverse of what happens in {@code postFetch} by
* retrieving the referenced entries from the destination server using
* the key attribute value.
* </LI>
* </UL>
* In addition, {@code transformRequest} has been implemented to convert
* hard deletes into soft deletes.
*
* It takes the following arguments:
* <UL>
* <LI>reference-attribute -- The destination attribute that stores the
* DN of the referenced entry.</LI>
* <LI>referenced-entry-key-attribute -- The key attribute on the referenced
* entry that is used to find the entry, e.g.
* uid.</LI>
* <LI>search-base-dn -- The base DN to search for referenced entries using
* the key.</LI>
* </UL>
*/
public class ExampleLDAPSyncDestinationPlugin
extends LDAPSyncDestinationPlugin
{
private static final String ARG_NAME_REFERENCE_ATTRIBUTE =
"reference-attribute";
private static final String ARG_NAME_REFERENCED_ENTRY_KEY_ATTRIBUTE =
"referenced-entry-key-attribute";
private static final String ARG_NAME_SEARCH_BASE_DN = "search-base-dn";
// The server context for the server in which this extension is running.
private SyncServerContext serverContext;
// This lock ensures that the configuration is updated atomically and safely.
private final ReadWriteLock configLock = new ReentrantReadWriteLock();
private final Lock configReadLock = configLock.readLock();
private final Lock configWriteLock = configLock.writeLock();
private String referenceAttribute;
private String referencedEntryKeyAttribute;
private DN searchBaseDn;
/**
* Retrieves a human-readable name for this extension.
*
* @return A human-readable name for this extension.
*/
@Override()
public String getExtensionName()
{
return "Example LDAP Sync Destination Plugin";
}
/**
* Retrieves a human-readable description for this extension. Each element
* of the array that is returned will be considered a separate paragraph in
* generated documentation.
*
* @return A human-readable description for this extension, or {@code null}
* or an empty array if no description should be available.
*/
@Override()
public String[] getExtensionDescription()
{
return new String[]
{
"This is simple example of an LDAP sync destination plugin which " +
"manipulates an attribute that stores a reference to another entry. " +
"In the LDAP destination server, the reference attribute is stored as " +
"the DN of the referenced entry, but in the sync source (possibly a " +
"relational database, the reference is stored as a key of the " +
"referenced entry, e.g. the equivalent of uid. In addition, this " +
"extension converts deletes from the source into soft deletes " +
"on the destination."
};
}
/**
* Updates the provided argument parser to define any configuration arguments
* which may be used by this sync pipe plugin. The argument parser may
* also be updated to define relationships between arguments (e.g., to specify
* required, exclusive, or dependent argument sets).
*
* @param parser The argument parser to be updated with the configuration
* arguments which may be used by this sync pipe plugin.
*
* @throws ArgumentException If a problem is encountered while updating the
* provided argument parser.
*/
@Override()
public void defineConfigArguments(final ArgumentParser parser)
throws ArgumentException
{
// Add an argument that allows you to specify the source attribute.
Character shortIdentifier = null;
String longIdentifier = ARG_NAME_REFERENCE_ATTRIBUTE;
boolean required = true;
int maxOccurrences = 1;
String placeholder = "{attr}";
String description = "The name of the destination attribute that " +
"stores a reference to another entry as a DN.";
StringArgument arg = new StringArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description);
arg.setValueRegex(Pattern.compile("^[a-zA-Z][a-zA-Z0-9\\\\-]*$"),
"A valid attribute name is required.");
parser.addArgument(arg);
shortIdentifier = null;
longIdentifier = ARG_NAME_REFERENCED_ENTRY_KEY_ATTRIBUTE;
required = true;
maxOccurrences = 1;
placeholder = "{attr}";
description = "The name of the key attribute on the destination " +
"entry that is referenced by the entry being synchronized. For " +
"instance, this could be 'uid' if the referring entry stored the " +
"value of the uid attribute in the referenced entry.";
arg = new StringArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description);
arg.setValueRegex(Pattern.compile("^[a-zA-Z][a-zA-Z0-9\\\\-]*$"),
"A valid attribute name is required.");
parser.addArgument(arg);
shortIdentifier = null;
longIdentifier = ARG_NAME_SEARCH_BASE_DN;
required = true;
maxOccurrences = 1;
placeholder = "{base-dn}";
description = "The base DN to use when searching for referenced " +
"entries. A subtree search will be issued with a base of the DN " +
"specified here to find the referenced entries.";
parser.addArgument(new DNArgument(shortIdentifier, longIdentifier, required,
maxOccurrences, placeholder, description));
}
/**
* Initializes this LDAP sync destination plugin. This method will be called
* before any other methods in the class.
*
* @param serverContext A handle to the server context for the
* Data Sync Server in which this extension is
* running. Extensions should typically store this
* in a class member.
* @param config The general configuration for this proxy
* transformation.
* @param parser The argument parser which has been initialized from
* the configuration for this LDAP sync destination
* plugin.
*
* @throws LDAPException If a problem occurs while initializing this ldap
* sync destination plugin.
*/
@Override
public void initializeLDAPSyncDestinationPlugin(
final SyncServerContext serverContext,
final LDAPSyncDestinationPluginConfig config,
final ArgumentParser parser)
throws LDAPException
{
this.serverContext = serverContext;
setConfig(config, parser);
}
/**
* Indicates whether the configuration contained in the provided argument
* parser represents a valid configuration for this extension.
*
* @param config The general configuration for this LDAP sync
* destination plugin.
* @param parser The argument parser which has been
* initialized with the proposed configuration.
* @param unacceptableReasons A list that can be updated with reasons that
* the proposed configuration is not acceptable.
*
* @return {@code true} if the proposed configuration is acceptable, or
* {@code false} if not.
*/
@Override
public boolean isConfigurationAcceptable(
final LDAPSyncDestinationPluginConfig config,
final ArgumentParser parser,
final List<String> unacceptableReasons)
{
// The built-in ArgumentParser validation does all of the validation that
// we need.
return true;
}
/**
* Attempts to apply the configuration contained in the provided argument
* parser.
*
* @param config The general configuration for this LDAP sync
* destination.
* @param parser The argument parser which has been
* initialized with the new configuration.
* @param adminActionsRequired A list that can be updated with information
* about any administrative actions that may be
* required before one or more of the
* configuration changes will be applied.
* @param messages A list that can be updated with information
* about the result of applying the new
* configuration.
*
* @return A result code that provides information about the result of
* attempting to apply the configuration change.
*/
@Override()
public ResultCode applyConfiguration(
final LDAPSyncDestinationPluginConfig config,
final ArgumentParser parser,
final List<String> adminActionsRequired,
final List<String> messages)
{
setConfig(config, parser);
return ResultCode.SUCCESS;
}
/**
* Sets the configuration for this plugin. This is a centralized place
* where the configuration is initialized or updated.
*
* @param config The general configuration for this LDAP sync
* destination plugin.
* @param parser The argument parser which has been initialized from
* the configuration for this LDAP sync destination
* plugin.
*/
private void setConfig(
final LDAPSyncDestinationPluginConfig config,
final ArgumentParser parser)
{
configWriteLock.lock();
try
{
this.referenceAttribute =((StringArgument)parser.getNamedArgument(
ARG_NAME_REFERENCE_ATTRIBUTE)).getValue();
this.referencedEntryKeyAttribute =
((StringArgument)parser.getNamedArgument(
ARG_NAME_REFERENCED_ENTRY_KEY_ATTRIBUTE)).getValue();
this.searchBaseDn = ((DNArgument)parser.getNamedArgument(
ARG_NAME_SEARCH_BASE_DN)).getValue();
}
finally
{
configWriteLock.unlock();
}
}
/**
* Retrieves a map containing examples of configurations that may be used for
* this extension. The map key should be a list of sample arguments, and the
* corresponding value should be a description of the behavior that will be
* exhibited by the extension when used with that configuration.
*
* @return A map containing examples of configurations that may be used for
* this extension. It may be {@code null} or empty if there should
* not be any example argument sets.
*/
@Override
public Map<List<String>, String> getExamplesArgumentSets()
{
final LinkedHashMap<List<String>,String> exampleMap =
new LinkedHashMap<List<String>,String>(1);
exampleMap.put(
Arrays.asList(
ARG_NAME_REFERENCE_ATTRIBUTE + "=manager",
ARG_NAME_REFERENCED_ENTRY_KEY_ATTRIBUTE + "=employeeNumber",
ARG_NAME_SEARCH_BASE_DN + "=dc=example,dc=com"),
"Converts between a DN and employeeNumber representation of the " +
"manager attribute at the destination");
return exampleMap;
}
/**
* This method is called after an attempt to fetch a destination entry. An
* connection to the destination server is provided along with the
* {@code SearchRequest} that was sent to the server. This method is
* overridden by plugins that need to manipulate the search results that
* are returned to the Sync Pipe. This can include filtering out certain
* entries, remove information from the entries, or adding additional
* information, possibly by doing a followup LDAP search.
* <p>
* This method might be called multiple times for a single synchronization
* operation, specifically when there are multiple search criteria or
* multiple base DNs defined for the Sync Destination.
* <p>
* This method will not be called if the search fails, for instance, if
* the base DN of the search does not exist.
*
* @param destinationConnection A connection to the destination server.
* @param searchRequest The search request that the LDAP Sync
* Destination used to fetch the entry.
* @param fetchedEntries A list of entries that have been fetched.
* When the search criteria matches multiple
* entries, they will all be returned. Entries
* in this list can be edited directly, and the
* list can be edited as well.
* @param operation The synchronization operation for this
* change.
*
* @return The result of the plugin processing.
*
* @throws LDAPException In general subclasses should not catch
* LDAPExceptions that are thrown when
* using the LDAPInterface unless there
* are specific exceptions that are
* expected. The Data Sync Server
* will handle LDAPExceptions in an
* appropriate way based on the specific
* cause of the exception. For example,
* some errors will result in the
* SyncOperation being retried, and others
* will trigger fail over to a different
* server. Plugins should only throw
* LDAPException for errors related to
* communication with the LDAP server.
* Use the return code to indicate other
* types of errors, which might require
* retry.
*/
@Override
public PostStepResult postFetch(final LDAPInterface destinationConnection,
final SearchRequest searchRequest,
final List<Entry> fetchedEntries,
final SyncOperation operation)
throws LDAPException
{
configReadLock.lock();
try
{
for (Entry entry: fetchedEntries)
{
String[] referenceDns = entry.getAttributeValues(referenceAttribute);
if (referenceDns == null)
{
serverContext.debugInfo("Entry " + entry.getDN() + " does not have " +
"any values for the " + referencedEntryKeyAttribute +
"attribute.");
continue;
}
List<String> keyValues = new ArrayList<String>(referenceDns.length);
for (int i = 0; i < referenceDns.length; i++)
{
String referenceDn = referenceDns[i];
Entry referencedEntry = destinationConnection.getEntry(referenceDn,
referencedEntryKeyAttribute);
if (referencedEntry != null)
{
String keyValue =
referencedEntry.getAttributeValue(referencedEntryKeyAttribute);
if (keyValue != null)
{
keyValues.add(keyValue);
}
else
{
operation.logError("For fetched entry '" + entry.getDN() + "', " +
"the example plugin could not find a corresponding " +
referencedEntryKeyAttribute + " value for referenced entry " +
referenceDn + " but the referenced entry does exist.");
}
}
else
{
operation.logError("For fetched entry '" + entry.getDN() + "', " +
"the example plugin could not find the entry, " +
referenceDn + ", which is referenced by " + referenceAttribute +
".");
}
}
if (keyValues.isEmpty())
{
operation.logInfo("Example plugin removed the " + referenceAttribute +
" attribute because no entries could be found to match the list " +
"DNs: " + Arrays.asList(referenceDns));
entry.removeAttribute(referenceAttribute);
}
else
{
operation.logInfo("Example plugin replacing DN(s)=" +
Arrays.asList(referenceDns) + " in attribute " +
referenceAttribute + " with " + referencedEntryKeyAttribute +
" value(s)=" + keyValues);
entry.setAttribute(new Attribute(referenceAttribute, keyValues));
}
}
return PostStepResult.CONTINUE;
}
finally
{
configReadLock.unlock();
}
}
/**
* This method is called before a destination entry is created. A
* connection to the destination server is provided along with the
* {@code Entry} that will be sent to the server. This method is
* overridden by plugins that need to alter the entry before it is created
* at the server.
*
* @param destinationConnection A connection to the destination server.
* @param entryToCreate The entry that will be created at the
* destination. A plugin that wishes to
* create the entry should be sure to return
* {@code PreStepResult#SKIP_CURRENT_STEP}.
* @param operation The synchronization operation for this
* change.
*
* @return The result of the plugin processing.
*
* @throws LDAPException In general subclasses should not catch
* LDAPExceptions that are thrown when
* using the LDAPInterface unless there
* are specific exceptions that are
* expected. The Data Sync Server
* will handle LDAPExceptions in an
* appropriate way based on the specific
* cause of the exception. For example,
* some errors will result in the
* SyncOperation being retried, and others
* will trigger fail over to a different
* server. Plugins should only throw
* LDAPException for errors related to
* communication with the LDAP server.
* Use the return code to indicate other
* types of errors, which might require
* retry.
*/
@Override
public PreStepResult preCreate(final LDAPInterface destinationConnection,
final Entry entryToCreate,
final SyncOperation operation)
throws LDAPException
{
try
{
configReadLock.lock();
String[] referenceValues =
entryToCreate.getAttributeValues(referenceAttribute);
if (referenceValues == null)
{
return PreStepResult.CONTINUE;
}
List<String> dnValues = new ArrayList<String>(referenceValues.length);
for (int i = 0; i < referenceValues.length; i++)
{
String referenceValue = referenceValues[i];
String dnValue = lookupDnByKeyValue(destinationConnection,
entryToCreate, operation, referenceValue);
if (dnValue != null)
{
dnValues.add(dnValue);
}
}
if (dnValues.isEmpty())
{
operation.logInfo("Example plugin removed the " + referenceAttribute +
" attribute because no entries could be found to match the list " +
"of values: " + Arrays.asList(referenceValues));
entryToCreate.removeAttribute(referenceAttribute);
}
else
{
operation.logInfo("Example plugin replacing " +
referencedEntryKeyAttribute + " reference values in the " +
referenceAttribute + " attribute: " +
Arrays.asList(referenceValues) +
" with DN value(s)=" + dnValues);
entryToCreate.setAttribute(new Attribute(referenceAttribute, dnValues));
}
return PreStepResult.CONTINUE;
}
finally
{
configReadLock.unlock();
}
}
/**
* This method is called before a destination entry is modified. A
* connection to the destination server is provided along with the
* {@code Entry} that will be sent to the server. This method is
* overridden by plugins that need to perform some processing on an entry
* before it is modified.
*
* @param destinationConnection A connection to the destination server.
* @param entryToModify The entry that will be modified at the
* destination. A plugin that wishes to
* modify the entry should be sure to return
* {@code PreStepResult#SKIP_CURRENT_STEP}.
* @param modsToApply A modifiable list of the modifications to
* apply at the server.
* @param operation The synchronization operation for this
* change.
*
* @return The result of the plugin processing.
*
* @throws LDAPException In general subclasses should not catch
* LDAPExceptions that are thrown when
* using the LDAPInterface unless there
* are specific exceptions that are
* expected. The Data Sync Server
* will handle LDAPExceptions in an
* appropriate way based on the specific
* cause of the exception. For example,
* some errors will result in the
* SyncOperation being retried, and others
* will trigger fail over to a different
* server. Plugins should only throw
* LDAPException for errors related to
* communication with the LDAP server.
* Use the return code to indicate other
* types of errors, which might require
* retry.
*/
@Override
public PreStepResult preModify(final LDAPInterface destinationConnection,
final Entry entryToModify,
final List<Modification> modsToApply,
final SyncOperation operation)
throws LDAPException
{
try
{
configReadLock.lock();
List<Modification> updatedModsToApply =
new ArrayList<Modification>(modsToApply.size());
for (Modification modification : modsToApply)
{
// Let any modification to non-referenceAttribute attributes pass
// straight through.
if (!referenceAttribute.equalsIgnoreCase(
modification.getAttributeName()))
{
updatedModsToApply.add(modification);
continue;
}
// For the referenceAttribute attribute, convert keys to DNs.
String[] keyValues = modification.getValues();
List<String> dnValues = new ArrayList<String>(keyValues.length);
for (String keyValue : keyValues)
{
String dnValue = lookupDnByKeyValue(destinationConnection,
entryToModify,
operation,
keyValue);
if (dnValue != null)
{
dnValues.add(dnValue);
}
}
// If we started off with no values, or ended up with at least one
// DN, then let this mod pass through.
if ((keyValues.length == 0) || !dnValues.isEmpty())
{
String[] dnValuesArr = dnValues.toArray(new String[]{ });
Modification updatedMod =
new Modification(modification.getModificationType(),
modification.getAttributeName(), dnValuesArr);
updatedModsToApply.add(updatedMod);
}
}
// We can't edit the mods in place, so we just replace them with the
// list that we built up.
modsToApply.clear();
modsToApply.addAll(updatedModsToApply);
if (modsToApply.isEmpty())
{
// If there are no mods, then skip the current step.
return PreStepResult.SKIP_CURRENT_STEP;
}
else
{
return PreStepResult.CONTINUE;
}
}
finally
{
configReadLock.unlock();
}
}
/**
* This method is called prior to executing any add, modify, delete, or
* search from the destination but after the respective pre method (e.g
* preFetch or preModify). A connection to the destination server is provided
* along with the {@code UpdatableLDAPRequest} that will be sent to the
* server. this method is overridden by plugins that need to modify the
* LDAP request prior to execution. For example, attaching a {@code Control}
* to the request. Callers of this method can use {@code instanceof}
* to determine which type of LDAP request is being made.
*
* @param destinationConnection A connection to the destination server.
* @param request The LDAP request that will be sent to
* the destination server.
* @param operation The synchronization operation for this
* change.
*
* @return The result of the plugin processing. Be very careful when
* returning {@code PreStepResult#RETRY_OPERATION_UNLIMITED} as this
* can stall all in flight operations until this operation completes.
* This return value should only be used in situations where a
* remote service (e.g., the LDAP server) is unavailable. In this
* case, it's preferable to just throw the underlying LDAPException,
* which the Data Sync Server will handle correctly based on
* the type of the operation.
*
* @throws LDAPException In general subclasses should not catch
* LDAPExceptions that are thrown when
* using the LDAPInterface unless there
* are specific exceptions that are
* expected. The Data Sync Server
* will handle LDAPExceptions in an
* appropriate way based on the specific
* cause of the exception. For example,
* some errors will result in the
* SyncOperation being retried, and others
* will trigger fail over to a different
* server. Plugins should only throw
* LDAPException for errors related to
* communication with the LDAP server.
* Use the return code to indicate other
* types of errors, which might require
* retry.
*/
@Override
public PreStepResult transformRequest(
final LDAPInterface destinationConnection,
final UpdatableLDAPRequest request,
final SyncOperation operation)
{
// If the request is a delete request then attach
// the soft delete request control.
if (request instanceof DeleteRequest)
{
request.addControl(new SoftDeleteRequestControl());
}
return PreStepResult.CONTINUE;
}
/**
* Returns the DN of the entry with a {@code referencedEntryKeyAttribute}
* value of {@code referenceValue}.
*
* @param destinationConnection A connection to the destination server.
* @param entry The referencing entry.
* @param operation The synchronization operation.
* @param referenceValue The value of the reference attribute.
*
* @return The DN of the referenced entry or {@code null} if there is not
* exactly one referenced entry.
*
* @throws LDAPException If there is a problem retrieving the remote entry.
*/
private String lookupDnByKeyValue(final LDAPInterface destinationConnection,
final Entry entry,
final SyncOperation operation,
final String referenceValue)
throws LDAPException
{
Filter filter = Filter.createEqualityFilter(referencedEntryKeyAttribute,
referenceValue);
SearchResult searchResult = destinationConnection.search(
searchBaseDn.toString(),
SearchScope.SUB,
filter,
"1.1"); // Don't return any attributes.
List<SearchResultEntry> entries = searchResult.getSearchEntries();
if (entries.isEmpty())
{
operation.logError("For entry '" +
entry.getDN() + "', " +
"the example plugin could not find any entry that matched " +
filter.toString() + ". This value of the " + referenceAttribute +
" attribute will not be included in the entry.");
return null;
}
else if (entries.size() > 1)
{
operation.logError("For entry '" +
entry.getDN() + "', " +
"the example plugin found " + entries.size() + " entries that " +
"matched " + filter.toString() + " instead of a single one. " +
"This value of the " + referenceAttribute +
" attribute will not be included in the entry.");
return null;
}
else
{
String dnValue = entries.get(0).getDN();
if (serverContext.debugEnabled())
{
serverContext.debugVerbose("When creating entry " +
entry.getDN() + " mapped " + referenceValue + " to " +
dnValue + " for the " + referenceAttribute + " attribute.");
}
return dnValue;
}
}
/**
* Appends a string representation of this LDAP sync destination plugin to
* the provided buffer.
*
* @param buffer The buffer to which the string representation should be
* appended.
*/
@Override()
public void toString(final StringBuilder buffer)
{
buffer.append("ExampleSyncPipePlugin(referenceAttribute='");
buffer.append(referenceAttribute);
buffer.append("', referencedEntryKeyAttribute='");
buffer.append(referencedEntryKeyAttribute);
buffer.append("', searchBaseDn='");
buffer.append(searchBaseDn);
buffer.append("')");
}
}
