com.expediagroup.graphql.federation.validation.validateFieldSet.kt Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2019 Expedia, Inc
 *
 * 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
 *
 *     https://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.expediagroup.graphql.federation.validation

import com.expediagroup.graphql.federation.directives.EXTERNAL_DIRECTIVE_NAME
import graphql.schema.GraphQLFieldDefinition
import graphql.schema.GraphQLInterfaceType
import graphql.schema.GraphQLList
import graphql.schema.GraphQLTypeUtil
import graphql.schema.GraphQLUnionType

internal fun validateFieldSet(targetField: GraphQLFieldDefinition?, extendedType: Boolean, errors: MutableList, validatedDirective: DirectiveInfo) {
    val errorMessage = validatedDirective.getErrorString()
    if (null != targetField) {
        val externalField = targetField.getDirective(EXTERNAL_DIRECTIVE_NAME) != null
        if (extendedType && !externalField) {
            errors.add("$errorMessage specifies invalid field set - extended type incorrectly references local field=${targetField.name}")
        } else if (!extendedType && externalField) {
            errors.add("$errorMessage specifies invalid field set - type incorrectly references external field=${targetField.name}")
        }

        /**
         * The @requires directive can have [list,interface,union] in the field selection.
         * All the other field set directives can not.
         */
        if (validatedDirective.directiveName != "requires") {
            when (GraphQLTypeUtil.unwrapNonNull(targetField.type)) {
                is GraphQLList -> errors.add("$errorMessage specifies invalid field set - field set references GraphQLList, field=${targetField.name}")
                is GraphQLInterfaceType -> errors.add("$errorMessage specifies invalid field set - field set references GraphQLInterfaceType, field=${targetField.name}")
                is GraphQLUnionType -> errors.add("$errorMessage specifies invalid field set - field set references GraphQLUnionType, field=${targetField.name}")
            }
        }
    } else {
        errors.add("$errorMessage specifies invalid field set - field set specifies fields that do not exist")
    }
}