forked from Netflix/dgs-framework
/
GraphiQlConfigurer.kt
70 lines (65 loc) · 2.84 KB
/
GraphiQlConfigurer.kt
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/*
* 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.webflux.autoconfiguration
import org.springframework.core.io.Resource
import org.springframework.web.reactive.config.ResourceHandlerRegistry
import org.springframework.web.reactive.config.WebFluxConfigurer
import org.springframework.web.reactive.resource.PathResourceResolver
import org.springframework.web.reactive.resource.ResourceTransformer
import org.springframework.web.reactive.resource.ResourceTransformerChain
import org.springframework.web.reactive.resource.TransformedResource
import org.springframework.web.server.ServerWebExchange
import reactor.core.publisher.Mono
import java.io.BufferedReader
import java.io.IOException
import java.nio.charset.StandardCharsets
class GraphiQlConfigurer(private val configProps: DgsWebfluxConfigurationProperties) : WebFluxConfigurer {
override fun addResourceHandlers(registry: ResourceHandlerRegistry) {
val graphqlPath = configProps.path
registry
.addResourceHandler(configProps.graphiql.path + "/**")
.addResourceLocations("classpath:/static/graphiql/")
.resourceChain(true)
.addResolver(PathResourceResolver())
.addTransformer(TokenReplacingTransformer("<DGS_GRAPHQL_PATH>", graphqlPath, configProps))
}
class TokenReplacingTransformer(
private val replaceToken: String,
private val replaceValue: String,
private val configProps: DgsWebfluxConfigurationProperties
) :
ResourceTransformer {
@Throws(IOException::class)
override fun transform(
exchange: ServerWebExchange,
resource: Resource,
transformerChain: ResourceTransformerChain
): Mono<Resource> {
if (exchange.request.uri.toASCIIString().endsWith(configProps.graphiql.path + "/index.html")) {
val content = resource.inputStream.bufferedReader().use(BufferedReader::readText)
return Mono.just(
TransformedResource(
resource,
content.replace(replaceToken, replaceValue).toByteArray(
StandardCharsets.UTF_8
)
)
)
}
return Mono.just(resource)
}
}
}