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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.concurrent.atomic.AtomicReference;
import java.util.regex.Pattern;
import com.unboundid.directory.sdk.sync.api.LDAPSyncSourcePlugin;
import com.unboundid.directory.sdk.sync.config.LDAPSyncSourcePluginConfig;
import com.unboundid.directory.sdk.sync.types.PostStepResult;
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.Entry;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPInterface;
import com.unboundid.ldap.sdk.ResultCode;
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 source plugin
* which manipulates an attribute that stores a reference to another entry.
* In the LDAP source server, the reference is stored as a DN, but the
* destination 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>
* </UL>
* It takes the following arguments:
* <UL>
* <LI>reference-attribute -- The source 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 ExampleLDAPSyncSourcePlugin
extends LDAPSyncSourcePlugin
{
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 Source 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 source plugin which " +
"manipulates an attribute that stores a reference to another entry. " +
"In the LDAP source server, the reference attribute is stored as " +
"the DN of the referenced entry, but in the sync destination (possibly " +
"a relational database, the reference is stored as a key of the " +
"referenced entry, e.g. the equivalent of uid."
};
}
/**
* 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 source 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\\\\-]*$"),
"A valid attribute name is required.");
parser.addArgument(arg);
shortIdentifier = null;
longIdentifier = ARG_NAME_REFERENCED_ENTRY_KEY_ATTRIBUTE;
required = true;
maxOccurrences = 1;
placeholder = "{attr}";
description = "The name of the key attribute on the source " +
"entry that is referenced by the entry being synchronized. For " +
"instance, this could be 'uid' if the referring entry stored the " +
"value of the uid attribute in the referenced entry.";
arg = new StringArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description);
arg.setValueRegex(Pattern.compile("^[a-zA-Z][a-zA-Z0-9\\\\-]*$"),
"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 source 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 source
* plugin.
*
* @throws LDAPException If a problem occurs while initializing this ldap
* sync source plugin.
*/
@Override
public void initializeLDAPSyncSourcePlugin(
final SyncServerContext serverContext,
final LDAPSyncSourcePluginConfig 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
* source 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 LDAPSyncSourcePluginConfig 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
* source.
* @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 LDAPSyncSourcePluginConfig 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
* source plugin.
* @param parser The argument parser which has been initialized from
* the configuration for this LDAP sync source
* plugin.
*/
private void setConfig(
final LDAPSyncSourcePluginConfig 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 source");
return exampleMap;
}
/**
* This method is called after fetching a source entry. A
* connection to the source server is provided. 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.
*
* @param sourceConnection A connection to the source server.
* @param fetchedEntryRef A reference to the entry that was fetched.
* This entry can be edited in place, or the
* reference can be changed to point to a
* different entry that the plugin constructs.
* @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 sourceConnection,
final AtomicReference<Entry> fetchedEntryRef,
final SyncOperation operation)
throws LDAPException
{
try
{
configReadLock.lock();
Entry entry = fetchedEntryRef.get();
if (entry == null)
{
return PostStepResult.CONTINUE;
}
String[] referenceDns = entry.getAttributeValues(referenceAttribute);
if (referenceDns == null)
{
serverContext.debugInfo("Entry " + entry.getDN() + " does not have " +
"any values for the " + referencedEntryKeyAttribute +
"attribute.");
return PostStepResult.CONTINUE;
}
List<String> keyValues = new ArrayList<String>(referenceDns.length);
for (int i = 0; i < referenceDns.length; i++)
{
String referenceDn = referenceDns[i];
Entry referencedEntry = sourceConnection.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();
}
}
/**
* Appends a string representation of this LDAP sync source 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("')");
}
}
