eu.europa.ec.eudi.sdjwt.vc.SdJwtVcIssuerMetaData.kt Maven / Gradle / Ivy
/*
* Copyright (c) 2023 European Commission
*
* 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 eu.europa.ec.eudi.sdjwt.vc
import com.nimbusds.jose.jwk.JWKSet
import io.ktor.client.*
import io.ktor.client.call.*
import io.ktor.client.request.*
import io.ktor.http.*
import kotlinx.serialization.SerialName
import kotlinx.serialization.Serializable
import kotlinx.serialization.json.JsonObject
import java.net.URI
/**
* The metadata of an SD-JWT VC issuer.
*/
internal data class SdJwtVcIssuerMetaData(
val issuer: URI,
val jwkSet: JWKSet,
)
/**
* Fetches the metadata of an SD-JWT VC issuer.
*/
internal class SdJwtVcIssuerMetaDataFetcher(private val httpClient: HttpClient) {
suspend fun fetchMetaData(issuer: Url): SdJwtVcIssuerMetaData {
val issuerMetadataUrl = issuerMetadataUrl(issuer)
val metadata = httpClient.get(issuerMetadataUrl).body()
check(issuer == Url(metadata.issuer)) { "issuer does not match the expected value" }
check((metadata.jwks != null) xor (metadata.jwksUri != null)) { "either 'jwks' or 'jwks_uri' must be provided" }
val jwkSet = run {
val jwksJsonString = if (metadata.jwks != null) {
metadata.jwks.toString()
} else {
requireNotNull(metadata.jwksUri)
httpClient.get(metadata.jwksUri).body().toString()
}
JWKSet.parse(jwksJsonString)
}
return SdJwtVcIssuerMetaData(issuer.toURI(), jwkSet)
}
}
private fun issuerMetadataUrl(issuer: Url): Url =
URLBuilder(issuer).apply {
path("/.well-known/jwt-vc-issuer${issuer.pathSegments.joinToString("/")}")
}.build()
@Serializable
private data class SdJwtVcIssuerMetadataTO(
val issuer: String,
@SerialName("jwks_uri") val jwksUri: String? = null,
@SerialName("jwks") val jwks: JsonObject? = null,
)