content: /*
   * Copyright 2017-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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 org.activiti.cloud.services.notifications.graphql.jpa.query;
  
  import graphql.schema.visibility.BlockedFields;
  import graphql.schema.visibility.GraphqlFieldVisibility;
  import java.util.Collection;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.Set;
  import java.util.function.Function;
  import java.util.function.Predicate;
  import java.util.function.Supplier;
  import java.util.regex.Pattern;
  import java.util.stream.Collectors;
  import org.springframework.security.access.AccessDeniedException;
  import org.springframework.security.authentication.AnonymousAuthenticationToken;
  import org.springframework.security.core.Authentication;
  import org.springframework.security.core.GrantedAuthority;
  import org.springframework.security.core.context.SecurityContext;
  import org.springframework.security.core.context.SecurityContextHolder;
  
  public class ActivitiGraphQlFieldVisibilityProvider implements Supplier<GraphqlFieldVisibility> {
  
      private static final BlockedFields blockAllFields = BlockedFields
          .newBlock()
          .addCompiledPattern(Pattern.compile(".*"))
          .build();
  
      private static final GraphqlFieldVisibility allowAllFields = VisibleFields
          .newFieldsVisibility()
          .addCompiledPattern(Pattern.compile(".*"))
          .build();
  
      private static final Predicate<Authentication> isAnonymous = AnonymousAuthenticationToken.class::isInstance;
  
      private String rolePrefix = "ROLE_";
  
      private final ActivitiGraphQlJPASchemaProperties.FieldsVisibilityProperties properties;
  
      public ActivitiGraphQlFieldVisibilityProvider(ActivitiGraphQlJPASchemaProperties properties) {
          this.properties = properties.getFieldsVisibility();
  
          Optional
              .ofNullable(properties.getRestrictedKeysProvider())
              .map(ActivitiGraphQlJPASchemaProperties.RestrictedKeysProviderProperties::getRolePrefix)
              .ifPresent(rolePrefix -> this.rolePrefix = rolePrefix);
      }
  
      @Override
      public GraphqlFieldVisibility get() {
          var authenticationToken = Optional
              .ofNullable(SecurityContextHolder.getContext())
              .map(SecurityContext::getAuthentication);
  
          if (authenticationToken.isEmpty()) {
              throw new AccessDeniedException("User is not allowed to access this resource");
          } else if (authenticationToken.filter(isAnonymous).isPresent()) {
              return blockAllFields;
          }
  
          return authenticationToken
              .filter(Authentication::isAuthenticated)
              .map(Authentication::getAuthorities)
              .map(authoritiesToVisibilityPatterns())
              .filter(Predicate.not(Collection::isEmpty))
              .map(toGraphQlFieldVisibility())
              .orElse(blockAllFields);
      }
  
      private Function<Collection<? extends GrantedAuthority>, Set<Pattern>> authoritiesToVisibilityPatterns() {
          return authorities ->
              authorities
                  .stream()
                  .map(GrantedAuthority::getAuthority)
                  .map(it -> it.replaceFirst(rolePrefix, ""))
                  .flatMap(it -> properties.getPatterns().getOrDefault(it, Set.of()).stream())
                  .filter(Objects::nonNull)
                  .collect(Collectors.toSet());
      }
  
      private Function<Set<Pattern>, GraphqlFieldVisibility> toGraphQlFieldVisibility() {
          return patterns ->
              VisibleFields
                  .newFieldsVisibility()
                  .addCompiledPatterns(patterns)
                  .addCompiledPattern(Pattern.compile("(?!JPA\\.).*"))
                  .build();
      }
  }
  