UnboundID Server SDK

Ping Identity
UnboundID Server SDK Documentation

ExampleStoreAdapterPlugin.java

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 * (the "License").  You may not use this file except in compliance
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 * You can obtain a copy of the license at
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package com.unboundid.directory.sdk.examples;

import com.unboundid.directory.sdk.broker.api.StoreAdapterPlugin;
import com.unboundid.directory.sdk.broker.config.StoreAdapterPluginConfig;
import com.unboundid.directory.sdk.broker.types.BrokerContext;
import com.unboundid.directory.sdk.broker.types.StorePreRetrieveRequestContext;
import com.unboundid.directory.sdk.broker.types.StorePreSearchRequestContext;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.scim2.common.exceptions.ScimException;
import com.unboundid.scim2.common.filters.Filter;
import com.unboundid.util.args.Argument;
import com.unboundid.util.args.ArgumentException;
import com.unboundid.util.args.ArgumentParser;
import com.unboundid.util.args.StringArgument;

import javax.servlet.http.HttpServletRequest;



/**
 * This example provides an implementation of a Store Adapter Plugin
 * which updates the SCIM filter on each request to add an additional
 * filter component referencing a value from a HTTP request header.
 */
public class ExampleStoreAdapterPlugin
    extends StoreAdapterPlugin
{
  /**
   * The name of a header which provides a value for the additional filter
   * component.
   */
  private String headerName;

  /**
   * The name of a native Store Adapter attribute to use in the additional
   * filter component.
   */
  private String attrName;

  /**
   * The name of the argument that will be used to specify the header name.
   */
  private static final String ARG_NAME_HEADER_NAME = "header-name";

  /**
   * The name of the argument that will be used to specify the header name.
   */
  private static final String ARG_NAME_ATTR_NAME = "attr-name";

  /**
   * Handle to the ServerContext object.
   */
  private BrokerContext serverContext;



  /**
   * {@inheritDoc}
   */
  @Override
  public String getExtensionName()
  {
    return "Example Store Adapter Plugin";
  }



  /**
   * {@inheritDoc}
   */
  @Override
  public String[] getExtensionDescription()
  {
    return new String[]
    {
      "This example provides an implementation of a Store Adapter Plugin " +
      "which updates the SCIM filter on each request to add an " +
      "additional filter component referencing a value from a HTTP request " +
      "header."
    };
  }



  /**
   * {@inheritDoc}
   */
  @Override
  public void defineConfigArguments(final ArgumentParser parser)
      throws ArgumentException
  {
    final Argument headerNameArg = new StringArgument(
        null,
        ARG_NAME_HEADER_NAME,
        true,
        1,
        null,
        "The name of the HTTP header providing a filter value");

    final Argument attrNameArg = new StringArgument(
        null,
        ARG_NAME_ATTR_NAME,
        true,
        1,
        null,
        "The name of the native Store Adapter attribute to filter on");

    parser.addArgument(headerNameArg);
    parser.addArgument(attrNameArg);
  }



  /**
   * Initializes this store adapter plugin. Any initialization should be
   * performed here. This method should generally store the
   * {@link BrokerContext} in a class member so that it can be used elsewhere
   * in the implementation.
   *
   * @param  serverContext  A handle to the server context for the server in
   *                        which this extension is running. Extensions should
   *                        typically store this in a class member.
   * @param  config         The general configuration for this object.
   * @param  parser         The argument parser which has been initialized from
   *                        the configuration for this store adapter plugin.
   * @throws LDAPException  If a problem occurs while initializing this store
   *                        adapter plugin.
   */
  @Override
  public void initializeStoreAdapterPlugin(
      final BrokerContext serverContext,
      final StoreAdapterPluginConfig config,
      final ArgumentParser parser)
      throws LDAPException
  {
    this.serverContext = serverContext;

    final StringArgument headerNameArg =
        (StringArgument) parser.getNamedArgument(ARG_NAME_HEADER_NAME);
    final StringArgument attrNameArg =
        (StringArgument) parser.getNamedArgument(ARG_NAME_ATTR_NAME);

    headerName = headerNameArg.getValue();
    attrName = attrNameArg.getValue();
  }



  /**
   * This method is called before searching for entries in the native data
   * store.
   *
   * @param context The store adapter request context.
   * @throws ScimException If thrown, the operation will be aborted and the
   *                       corresponding SCIM ErrorResult will be returned to
   *                       the client.
   */
  @Override
  public void preSearch(final StorePreSearchRequestContext context)
      throws ScimException
  {
    // Get the HTTP request.
    final HttpServletRequest request = context.getHttpServletRequest();

    // Get the current request filter.
    final Filter filter = context.getSCIMFilter();

    // Create a new filter for the request.
    Filter modifiedFilter = updateFilter(request, filter);

    // Set the new filter on the request.
    context.setSCIMFilter(modifiedFilter);
  }



  /**
   * This method is called before an entry is retrieved from the native data
   * store in the following cases:
   * <UL>
   *   <LI>
   *     To fetch an entry for a SCIM retrieve operation.
   *   </LI>
   *   <LI>
   *     To fetch an entry to be updated during a SCIM update operation.
   *   </LI>
   *   <LI>
   *     To fetch an entry from a secondary store adapter for each primary store
   *     adapter entry obtained during a SCIM search.
   *   </LI>
   *   <LI>
   *     To fetch an entry from the primary store adapter for each secondary
   *     store adapter entry obtained when a SCIM search filter is processed
   *     by a secondary store adapter.
   *   </LI>
   * </UL>
   *
   * @param context The store adapter request context.
   * @throws ScimException If thrown, the operation will be aborted and a
   *                       corresponding SCIM ErrorResponse will be returned to
   *                       the client.
   */
  @Override
  public void preRetrieve(final StorePreRetrieveRequestContext context)
      throws ScimException
  {
    // Get the HTTP request.
    final HttpServletRequest request = context.getHttpServletRequest();

    // Get the current request filter.
    final Filter filter = context.getSCIMFilter();

    // Create a new filter for the request.
    Filter modifiedFilter = updateFilter(request, filter);

    // Set the new filter on the request.
    context.setSCIMFilter(modifiedFilter);
  }



  /**
   * Modify the provided SCIM filter to add an additional filter component
   * referencing a value from a HTTP request header.
   * @param request  The HTTP request.
   * @param filter   The SCIM filter to be modified.
   * @return  The modified filter.
   * @throws ScimException  If the provided filter cannot be parsed.
   */
  private Filter updateFilter(final HttpServletRequest request,
                              final Filter filter)
      throws ScimException
  {
    if (request == null)
    {
      // No servlet request. Return unchanged filter.
      return filter;
    }

    // Get the header value.
    final String filterValue =
        getTrimmedValue(request.getHeader(headerName));
    if (filterValue == null)
    {
      // No header value. Return unchanged filter.
      return filter;
    }

    // Create an equality-match filter component.
    final Filter additionalFilter = Filter.eq(attrName, filterValue);

    // Create a new filter for the request.
    Filter modifiedFilter;
    if (filter == null)
    {
      modifiedFilter = additionalFilter;
    }
    else
    {
      modifiedFilter = Filter.and(filter, additionalFilter);
    }

    return modifiedFilter;
  }



  /**
   * Removes leading and trailing space from the provided value, and returns
   * {@code null} if the resulting value is empty. Returns null if the
   * provided value is null.
   *
   * @param value  The value to be trimmed of leading and trailing space.
   * @return  The trimmed value, or {@code null} if the provided value is null
   *          or the trimmed value is empty.
   */
  private String getTrimmedValue(final String value)
  {
    if (value == null)
    {
      return null;
    }

    final String trimmedValue = value.trim();
    if (trimmedValue.isEmpty())
    {
      return null;
    }

    return trimmedValue;
  }
}