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IssuanceService.kt
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IssuanceService.kt
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package id.walt.webwallet.service.exchange
import id.walt.crypto.utils.JwsUtils
import id.walt.crypto.utils.JwsUtils.decodeJws
import id.walt.did.dids.DidService
import id.walt.oid4vc.data.CredentialFormat
import id.walt.oid4vc.data.CredentialOffer
import id.walt.oid4vc.data.GrantType
import id.walt.oid4vc.data.OpenIDProviderMetadata
import id.walt.oid4vc.providers.TokenTarget
import id.walt.oid4vc.requests.*
import id.walt.oid4vc.responses.BatchCredentialResponse
import id.walt.oid4vc.responses.CredentialResponse
import id.walt.oid4vc.responses.TokenResponse
import id.walt.oid4vc.util.randomUUID
import id.walt.webwallet.manifest.extractor.EntraManifestExtractor
import id.walt.webwallet.service.oidc4vc.TestCredentialWallet
import id.walt.webwallet.utils.WalletHttpClients
import io.ktor.client.call.*
import io.ktor.client.request.*
import io.ktor.client.request.forms.*
import io.ktor.client.statement.*
import io.ktor.http.*
import io.ktor.util.*
import kotlinx.serialization.Serializable
import kotlinx.serialization.json.Json
import kotlinx.serialization.json.JsonObject
import kotlinx.serialization.json.jsonObject
import kotlinx.serialization.json.jsonPrimitive
import org.slf4j.LoggerFactory
object IssuanceService {
private val http = WalletHttpClients.getHttpClient()
private val logger = LoggerFactory.getLogger(this::class.java)
suspend fun useOfferRequest(
offer: String, credentialWallet: TestCredentialWallet, clientId: String,
) = let {
logger.debug("// -------- WALLET ----------")
logger.debug("// as WALLET: receive credential offer, either being called via deeplink or by scanning QR code")
logger.debug("// parse credential URI")
val reqParams = Url(offer).parameters.toMap()
// entra or openid4vc credential offer
val isEntra = EntraIssuanceRequest.isEntraIssuanceRequestUri(offer)
val credentialResponses = if (isEntra) {
processMSEntraIssuanceRequest(
EntraIssuanceRequest.fromAuthorizationRequest(
AuthorizationRequest.fromHttpParametersAuto(
reqParams
)
), credentialWallet
)
} else {
processCredentialOffer(
credentialWallet.resolveCredentialOffer(CredentialOfferRequest.fromHttpParameters(reqParams)),
credentialWallet,
clientId
)
}
// === original ===
logger.debug("// parse and verify credential(s)")
if (credentialResponses.all { it.credential == null }) {
throw IllegalStateException("No credential was returned from credentialEndpoint: $credentialResponses")
}
// ??multiple credentials manifests
val manifest =
isEntra.takeIf { it }?.let { EntraManifestExtractor().extract(offer) }
credentialResponses.map {
getCredentialData(it, manifest)
}
}
private suspend fun processCredentialOffer(
credentialOffer: CredentialOffer,
credentialWallet: TestCredentialWallet,
clientId: String,
): List<CredentialResponse> {
logger.debug("// get issuer metadata")
val providerMetadataUri =
credentialWallet.getCIProviderMetadataUrl(credentialOffer.credentialIssuer)
logger.debug("Getting provider metadata from: $providerMetadataUri")
val providerMetadataResult = http.get(providerMetadataUri)
logger.debug("Provider metadata returned: " + providerMetadataResult.bodyAsText())
val providerMetadata = providerMetadataResult.body<JsonObject>().let { OpenIDProviderMetadata.fromJSON(it) }
logger.debug("providerMetadata: {}", providerMetadata)
logger.debug("// resolve offered credentials")
val offeredCredentials = credentialOffer.resolveOfferedCredentials(providerMetadata)
logger.debug("offeredCredentials: {}", offeredCredentials)
//val offeredCredential = offeredCredentials.first()
//logger.debug("offeredCredentials[0]: $offeredCredential")
logger.debug("// fetch access token using pre-authorized code (skipping authorization step)")
val tokenReq = TokenRequest(
grantType = GrantType.pre_authorized_code,
clientId = clientId,
redirectUri = credentialWallet.config.redirectUri,
preAuthorizedCode = credentialOffer.grants[GrantType.pre_authorized_code.value]!!.preAuthorizedCode,
userPin = null
)
// logger.debug("tokenReq: {}", tokenReq)
val tokenResp = http.submitForm(
providerMetadata.tokenEndpoint!!, formParameters = parametersOf(tokenReq.toHttpParameters())
).let {
logger.debug("tokenResp raw: {}", it)
it.body<JsonObject>().let { TokenResponse.fromJSON(it) }
}
// logger.debug("tokenResp: {}", tokenResp)
logger.debug(">>> Token response = success: ${tokenResp.isSuccess}")
logger.debug("// receive credential")
val nonce = tokenResp.cNonce
logger.debug("Using issuer URL: ${credentialOffer.credentialIssuer}")
val credReqs = offeredCredentials.map { offeredCredential ->
CredentialRequest.forOfferedCredential(
offeredCredential = offeredCredential,
proof = credentialWallet.generateDidProof(
did = credentialWallet.did,
issuerUrl = credentialOffer.credentialIssuer,
nonce = nonce
)
)
}
logger.debug("credReqs: {}", credReqs)
return when {
credReqs.size >= 2 -> {
val batchCredentialRequest = BatchCredentialRequest(credReqs)
val credentialResponses = http.post(providerMetadata.batchCredentialEndpoint!!) {
contentType(ContentType.Application.Json)
bearerAuth(tokenResp.accessToken!!)
setBody(batchCredentialRequest.toJSON())
}.body<JsonObject>().let { BatchCredentialResponse.fromJSON(it) }
logger.debug("credentialResponses: {}", credentialResponses)
credentialResponses.credentialResponses
?: throw IllegalArgumentException("No credential responses returned")
}
credReqs.size == 1 -> {
val credReq = credReqs.first()
val credentialResponse = http.post(providerMetadata.credentialEndpoint!!) {
contentType(ContentType.Application.Json)
bearerAuth(tokenResp.accessToken!!)
setBody(credReq.toJSON())
}.body<JsonObject>().let { CredentialResponse.fromJSON(it) }
logger.debug("credentialResponse: {}", credentialResponse)
listOf(credentialResponse)
}
else -> throw IllegalStateException("No credentials offered")
}
}
private suspend fun processMSEntraIssuanceRequest(
entraIssuanceRequest: EntraIssuanceRequest,
credentialWallet: TestCredentialWallet,
pin: String? = null
): List<CredentialResponse> {
// *) Load key:
// val walletKey = getKeyByDid(credentialWallet.did)
val walletKey = DidService.resolveToKey(credentialWallet.did).getOrThrow()
// *) Create response JWT token, signed by key for holder DID
val responseObject = entraIssuanceRequest.getResponseObject(
walletKey.getThumbprint(),
credentialWallet.did,
walletKey.getPublicKey().exportJWK(),
pin
)
val responseToken = credentialWallet.signToken(TokenTarget.TOKEN, responseObject, keyId = credentialWallet.did)
// *) POST response JWT token to return address found in manifest
val resp = http.post(entraIssuanceRequest.issuerReturnAddress) {
contentType(ContentType.Text.Plain)
setBody(responseToken)
}
val responseBody = resp.bodyAsText()
logger.debug("Resp: {}", resp)
logger.debug(responseBody)
val vc =
runCatching { Json.parseToJsonElement(responseBody).jsonObject["vc"]!!.jsonPrimitive.content }.getOrElse {
throw IllegalArgumentException("Could not get Verifiable Credential from response: $responseBody")
}
return listOf(CredentialResponse.Companion.success(CredentialFormat.jwt_vc_json, vc))
}
private fun getCredentialData(
credentialResp: CredentialResponse, manifest: JsonObject?,
) = let {
val credential = credentialResp.credential!!.jsonPrimitive.content
val credentialJwt = credential.decodeJws(withSignature = true)
when (val typ = credentialJwt.header["typ"]?.jsonPrimitive?.content?.lowercase()) {
"jwt" -> parseJwtCredentialResponse(credentialJwt, credential, manifest, typ)
"vc+sd-jwt" -> parseSdJwtCredentialResponse(credentialJwt, credential, manifest, typ)
null -> throw IllegalArgumentException("WalletCredential JWT does not have \"typ\"")
else -> throw IllegalArgumentException("Invalid credential \"typ\": $typ")
}
}
//TODO: move to related entity
private fun parseJwtCredentialResponse(
credentialJwt: JwsUtils.JwsParts, document: String, manifest: JsonObject?, type: String
) = let {
val credentialId =
credentialJwt.payload["vc"]!!.jsonObject["id"]?.jsonPrimitive?.content?.takeIf { it.isNotBlank() }
?: randomUUID()
logger.debug("Got JWT credential: {}", credentialJwt)
CredentialDataResult(
id = credentialId,
document = document,
manifest = manifest?.toString(),
type = type,
)
}
//TODO: move to related entity
private fun parseSdJwtCredentialResponse(
credentialJwt: JwsUtils.JwsParts, document: String, manifest: JsonObject?, type: String
) = let {
val credentialId =
credentialJwt.payload["id"]?.jsonPrimitive?.content?.takeIf { it.isNotBlank() } ?: randomUUID()
logger.debug("Got SD-JWT credential: $credentialJwt")
val disclosures = credentialJwt.signature.split("~").drop(1)
logger.debug("Disclosures (${disclosures.size}): $disclosures")
val disclosuresString = disclosures.joinToString("~")
val credentialWithoutDisclosures = document.substringBefore("~")
CredentialDataResult(
id = credentialId,
document = credentialWithoutDisclosures,
disclosures = disclosuresString,
manifest = manifest?.toString(),
type = type,
)
}
@Serializable
data class CredentialDataResult(
val id: String,
val document: String,
val manifest: String? = null,
val disclosures: String? = null,
val type: String?,
)
}