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Main ACS AEM Commons OSGi Bundle. Includes commons utilities.
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/*
 * ACS AEM Commons
 *
 * Copyright (C) 2013 - 2023 Adobe
 *
 * 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.
 */
package com.adobe.acs.commons.reports.internal.datasources;

import com.adobe.acs.commons.util.QueryHelper;
import com.adobe.acs.commons.wcm.datasources.DataSourceBuilder;
import com.adobe.acs.commons.wcm.datasources.DataSourceOption;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ValueMap;
import org.apache.sling.api.servlets.HttpConstants;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nonnull;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import static javax.jcr.query.Query.JCR_SQL2;

@Component(service = Servlet.class, property = {
    "sling.servlet.resourceTypes=acs-commons/components/utilities/report-builder/data-sources/dynamic-select",
    "sling.servlet.methods=" + HttpConstants.METHOD_GET, })
public class DynamicSelectDataSource extends SlingSafeMethodsServlet {

  private static final long serialVersionUID = -4060071633522289836L;

  private static final Logger log = LoggerFactory.getLogger(DynamicSelectDataSource.class);

  static final String PN_DROP_DOWN_QUERY_LANGUAGE = "dropDownQueryLanguage";
  static final String PN_DROP_DOWN_QUERY = "dropDownQuery";
  static final String PN_ALLOW_PROPERTY_NAMES = "allowedPropertyNames";

  @Reference
  private transient DataSourceBuilder dataSourceBuilder;

  @Reference
  private transient QueryHelper queryHelper;

  @Override
  protected void doGet(@Nonnull SlingHttpServletRequest request, @Nonnull SlingHttpServletResponse response)
      throws ServletException, IOException {

    final ResourceResolver resolver = request.getResourceResolver();
    final ValueMap properties = request.getResource().getValueMap();

    final List options = new ArrayList<>();

    try {
      // The query language property
      final String queryLanguage = properties.get(PN_DROP_DOWN_QUERY_LANGUAGE, JCR_SQL2);
      // The query statement (this must match the queryLanguage else the query will
      // fail)
      final String queryStatement = properties.get(PN_DROP_DOWN_QUERY, String.class);
      // The property names to extract; these are specified as a String[] property
      final String[] allowedPropertyNames = properties.get(PN_ALLOW_PROPERTY_NAMES, new String[0]);

      if (StringUtils.isNotBlank(queryStatement)) {
        // perform the query
        final List results = queryHelper.findResources(resolver, queryLanguage, queryStatement,
            StringUtils.EMPTY);
        final List distinctOptionValues = new ArrayList<>();

        for (final Resource resource : results) {
          // For each result...
          // - ensure the property value is a String
          // - ensure either no properties have been specified (which means ALL properties
          // are eligible) OR the property is in the list of enumerated propertyNames
          // - ensure this property value has not already been processed
          // -- if the above criteria is satisfied, add to the options
          resource.getValueMap().entrySet().stream().filter(entry -> entry.getValue() instanceof String)
              .filter(entry -> ArrayUtils.isEmpty(allowedPropertyNames)
                  || ArrayUtils.contains(allowedPropertyNames, entry.getKey()))
              .filter(entry -> !distinctOptionValues.contains(entry.getValue().toString())).forEach(entry -> {
                String value = entry.getValue().toString();
                distinctOptionValues.add(value);
                options.add(new DataSourceOption(value, value));
              });
        }
      }

      // Create a datasource from the collected options, even if there are 0 options.
      dataSourceBuilder.addDataSource(request, options);

    } catch (Exception e) {
      log.error(
          "Unable to collect the information to populate the ACS Commons Report Builder dynamic-select drop-down.", e);
      response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
  }
}