main.com.netflix.graphql.dgs.scalars.UploadScalar.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of graphql-dgs Show documentation

graphql-dgs

There is a newer version: 10.0.1

/*
 * Copyright 2021 Netflix, 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
 *
 *    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.netflix.graphql.dgs.scalars

import com.netflix.graphql.dgs.DgsComponent
import com.netflix.graphql.dgs.DgsRuntimeWiring
import graphql.schema.*
import graphql.schema.idl.RuntimeWiring
import org.springframework.web.multipart.MultipartFile

@DgsComponent
class UploadScalar {
    val upload: GraphQLScalarType =
        GraphQLScalarType
            .newScalar()
            .name("Upload")
            .description("A custom scalar that represents files")
            .coercing(MultipartFileCoercing)
            .build()

    object MultipartFileCoercing : Coercing {
        @Throws(CoercingSerializeException::class)
        override fun serialize(dataFetcherResult: Any): Void = throw CoercingSerializeException("Upload is an input-only type")

        @Throws(CoercingParseValueException::class)
        override fun parseValue(input: Any): MultipartFile =
            if (input is MultipartFile) {
                input
            } else {
                run {
                    throw CoercingParseValueException(
                        "Expected type " +
                            MultipartFile::class.java.name +
                            " but was " +
                            input.javaClass.name,
                    )
                }
            }

        override fun parseLiteral(input: Any): MultipartFile =
            throw CoercingParseLiteralException(
                "Must use variables to specify Upload values",
            )
    }

    // add the scalar manually since we can't use @DgsScalar in the framework
    @DgsRuntimeWiring
    fun addScalar(builder: RuntimeWiring.Builder): RuntimeWiring.Builder = builder.scalar(upload)
}