io.stargate.graphql.schema.graphqlfirst.fetchers.deployed.DeleteFetcher Maven / Gradle / Ivy

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/*
 * Copyright The Stargate Authors
 *
 * 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 io.stargate.graphql.schema.graphqlfirst.fetchers.deployed;

import graphql.execution.DataFetcherResult;
import graphql.schema.DataFetchingEnvironment;
import io.stargate.auth.Scope;
import io.stargate.auth.SourceAPI;
import io.stargate.auth.TypedKeyValue;
import io.stargate.auth.UnauthorizedException;
import io.stargate.db.query.BoundDelete;
import io.stargate.db.query.builder.AbstractBound;
import io.stargate.db.query.builder.BuiltCondition;
import io.stargate.db.schema.Keyspace;
import io.stargate.graphql.schema.graphqlfirst.processor.DeleteModel;
import io.stargate.graphql.schema.graphqlfirst.processor.EntityModel;
import io.stargate.graphql.schema.graphqlfirst.processor.MappingModel;
import io.stargate.graphql.web.StargateGraphqlContext;
import java.util.List;
import java.util.Map;
import java.util.function.Function;

public class DeleteFetcher extends MutationFetcher> {

  public DeleteFetcher(DeleteModel model, MappingModel mappingModel) {
    super(model, mappingModel);
  }

  @Override
  protected MutationPayload> getPayload(
      DataFetchingEnvironment environment, StargateGraphqlContext context)
      throws UnauthorizedException {
    EntityModel entityModel = model.getEntity();
    Keyspace keyspace = context.getDataStore().schema().keyspace(entityModel.getKeyspaceName());

    // We're either getting the values from a single entity argument, or individual PK field
    // arguments:
    java.util.function.Predicate hasArgument;
    Function getArgument;
    if (model.getEntityArgumentName().isPresent()) {
      Map entity = environment.getArgument(model.getEntityArgumentName().get());
      hasArgument = entity::containsKey;
      getArgument = entity::get;
    } else {
      hasArgument = environment::containsArgument;
      getArgument = environment::getArgument;
    }

    List whereConditions =
        bindWhere(
            model.getWhereConditions(),
            hasArgument,
            getArgument,
            entityModel::validateNoFiltering,
            keyspace);
    List ifConditions =
        bindIf(model.getIfConditions(), hasArgument, getArgument, keyspace);
    AbstractBound query =
        context
            .getDataStore()
            .queryBuilder()
            .delete()
            .from(entityModel.getKeyspaceName(), entityModel.getCqlName())
            .where(whereConditions)
            .ifs(ifConditions)
            .ifExists(model.ifExists())
            .build()
            .bind();

    List primaryKey = TypedKeyValue.forDML((BoundDelete) query);
    context
        .getAuthorizationService()
        .authorizeDataWrite(
            context.getSubject(),
            entityModel.getKeyspaceName(),
            entityModel.getCqlName(),
            primaryKey,
            Scope.DELETE,
            SourceAPI.GRAPHQL);

    return new MutationPayload<>(query, primaryKey, getDeleteOrUpdateResultBuilder(environment));
  }
}