feat: tranform mdoc claims to json

Author: auer-martin

packages/core/src/modules/dcql/DcqlService.ts

@@ -3,6 +3,7 @@ import type { AgentContext } from '../../agent'
 import { DcqlCredential, DcqlMdocCredential, DcqlQuery, DcqlSdJwtVcCredential } from 'dcql'
 import { injectable } from 'tsyringe'
 
+import { JsonValue } from '../../types'
 import { Mdoc, MdocApi, MdocDeviceResponse, MdocOpenId4VpSessionTranscriptOptions, MdocRecord } from '../mdoc'
 import { SdJwtVcApi, SdJwtVcRecord, SdJwtVcService } from '../sd-jwt-vc'
 import { buildDisclosureFrameForPayload } from '../sd-jwt-vc/disclosureFrame'
@@ -17,6 +18,19 @@ import {
 } from './models'
 import { dcqlGetPresentationsToCreate as getDcqlVcPresentationsToCreate } from './utils'
 
+interface HasToJson {
+  toJson(): JsonValue
+}
+
+function isToJsonable(value: unknown): value is HasToJson {
+  return (
+    value !== null &&
+    typeof value === 'object' &&
+    'toJson' in value &&
+    typeof (value as HasToJson).toJson === 'function'
+  )
+}
+
 /**
  * @todo create a public api for using dif presentation exchange
  */
@@ -99,10 +113,23 @@ export class DcqlService {
 
     const dcqlCredentials: DcqlCredential[] = credentialRecords.map((record) => {
       if (record.type === 'MdocRecord') {
+        const transformValue = (value: unknown): unknown => {
+          if (typeof value !== 'function' && typeof value !== 'object') return value
+          return isToJsonable(value) ? value.toJson() : 'unknown json representation'
+        }
+
+        const mdoc = Mdoc.fromBase64Url(record.base64Url)
+
+        const namespaces = Object.fromEntries(
+          Object.entries(mdoc.issuerSignedNamespaces).map(([key, namespace]) => [
+            key,
+            Object.fromEntries(Object.entries(namespace).map(([k, v]) => [k, transformValue(v)])),
+          ])
+        )
         return {
           credential_format: 'mso_mdoc',
           doctype: record.getTags().docType,
-          namespaces: Mdoc.fromBase64Url(record.base64Url).issuerSignedNamespaces,
+          namespaces,
         } satisfies DcqlMdocCredential
       } else if (record.type === 'SdJwtVcRecord') {
         return {