feat: Created an issuer verification of an EBSI issued credential

Sphereon-Opensource · Sep 9, 2024 · 333b395 · 333b395
1 parent 6c9bb92
commit 333b395
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Showing 3 changed files with 46 additions and 2 deletions.
diff --git a/packages/oid4vci-holder/src/agent/OID4VCIHolder.ts b/packages/oid4vci-holder/src/agent/OID4VCIHolder.ts
@@ -84,7 +84,7 @@ import {
   StartResult,
   StoreCredentialBrandingArgs,
   StoreCredentialsArgs,
-  VerificationResult,
+  VerificationResult, VerifyCredentialIssuerArgs, VerifyCredentialIssuerResult,
 } from '../types/IOID4VCIHolder'
 import {
   getBasicIssuerLocaleBranding,
@@ -97,6 +97,7 @@ import {
   verifyCredentialToAccept,
 } from './OID4VCIHolderService'
 
+import 'cross-fetch/polyfill'
 /**
  * {@inheritDoc IOID4VCIHolder}
  */
@@ -189,6 +190,14 @@ export function signCallback(
   }
 }
 
+export async function verifyCredentialIssuer(args: VerifyCredentialIssuerArgs): Promise<VerifyCredentialIssuerResult> {
+  const { wrappedVc } = args
+
+  const vc = wrappedVc.decoded?.iss ?? (typeof wrappedVc.decoded?.vc?.issuer === 'string' ? wrappedVc.decoded?.vc?.issuer : wrappedVc.decoded?.vc?.issuer?.existingInstanceId)
+  const url = `https://api-conformance.ebsi.eu/trusted-issuers-registry/v4/issuers/${vc.issuer}`;
+  return await (await fetch(url)).json()
+}
+
 export class OID4VCIHolder implements IAgentPlugin {
   readonly eventTypes: Array<OID4VCIHolderEvent> = [
     OID4VCIHolderEvent.CONTACT_IDENTITY_CREATED,
@@ -235,12 +244,14 @@ export class OID4VCIHolder implements IAgentPlugin {
   private readonly onContactIdentityCreated?: (args: OnContactIdentityCreatedArgs) => Promise<void>
   private readonly onCredentialStored?: (args: OnCredentialStoredArgs) => Promise<void>
   private readonly onIdentifierCreated?: (args: OnIdentifierCreatedArgs) => Promise<void>
+  private readonly onVerifyIssuerType?: (args: VerifyCredentialIssuerArgs) => Promise<VerifyCredentialIssuerResult>
 
   constructor(options?: OID4VCIHolderOptions) {
     const {
       onContactIdentityCreated,
       onCredentialStored,
       onIdentifierCreated,
+      onVerifyIssuerType,
       vcFormatPreferences,
       jsonldCryptographicSuitePreferences,
       didMethodPreferences,
@@ -266,6 +277,7 @@ export class OID4VCIHolder implements IAgentPlugin {
     this.onContactIdentityCreated = onContactIdentityCreated
     this.onCredentialStored = onCredentialStored
     this.onIdentifierCreated = onIdentifierCreated
+    this.onVerifyIssuerType = onVerifyIssuerType
   }
 
   public async onEvent(event: any, context: RequiredContext): Promise<void> {
@@ -745,6 +757,7 @@ export class OID4VCIHolder implements IAgentPlugin {
       credentialsToAccept.map((credentialToAccept) =>
         verifyCredentialToAccept({
           mappedCredential: credentialToAccept,
+          onVerifyIssuerType: this.onVerifyIssuerType,
           context,
         }),
       ),

diff --git a/packages/oid4vci-holder/src/agent/OID4VCIHolderService.ts b/packages/oid4vci-holder/src/agent/OID4VCIHolderService.ts
@@ -119,7 +119,7 @@ export const selectCredentialLocaleBranding = async (
 }
 
 export const verifyCredentialToAccept = async (args: VerifyCredentialToAcceptArgs): Promise<VerificationResult> => {
-  const { mappedCredential, hasher, context } = args
+  const { mappedCredential, hasher, onVerifyIssuerType, context } = args
 
   const credential = mappedCredential.credentialToAccept.credentialResponse.credential as OriginalVerifiableCredential
   if (!credential) {
@@ -139,6 +139,15 @@ export const verifyCredentialToAccept = async (args: VerifyCredentialToAcceptArg
     }
   }
 
+  if (onVerifyIssuerType) {
+    const issuer = await onVerifyIssuerType({
+      wrappedVc: wrappedVC
+    })
+    if (!issuer.attributes.some(a => ['RootTAO', 'TAO'].includes(a.issuerType))) {
+      throw Error('Credential must be issued by a Root TAO or TAO')
+    }
+  }
+
   const verificationResult: VerificationResult = await verifyCredential(
     {
       credential,

diff --git a/packages/oid4vci-holder/src/types/IOID4VCIHolder.ts b/packages/oid4vci-holder/src/types/IOID4VCIHolder.ts
@@ -76,6 +76,7 @@ export type OID4VCIHolderOptions = {
   onContactIdentityCreated?: (args: OnContactIdentityCreatedArgs) => Promise<void>
   onCredentialStored?: (args: OnCredentialStoredArgs) => Promise<void>
   onIdentifierCreated?: (args: OnIdentifierCreatedArgs) => Promise<void>
+  onVerifyIssuerType?: (args: VerifyCredentialIssuerArgs) => Promise<VerifyCredentialIssuerResult>
   vcFormatPreferences?: Array<string>
   jsonldCryptographicSuitePreferences?: Array<string>
   defaultAuthorizationRequestOptions?: AuthorizationRequestOpts
@@ -164,6 +165,7 @@ export enum SupportedLanguage {
 
 export type VerifyCredentialToAcceptArgs = {
   mappedCredential: MappedCredentialToAccept
+  onVerifyIssuerType?: (args: VerifyCredentialIssuerArgs) => Promise<VerifyCredentialIssuerResult>
   hasher?: Hasher
   context: RequiredContext
 }
@@ -602,4 +604,24 @@ export type RequiredContext = IAgentContext<
     IKeyManager &
     ISDJwtPlugin
 >
+
+export type IssuerType = 'RootTAO' | 'TAO' | 'TI' | 'Revoked or Undefined'
+
+export type VerifyCredentialIssuerArgs = {
+  wrappedVc: WrappedVerifiableCredential
+}
+
+export type Attribute = {
+  hash: string
+  body: string
+  issuerType: IssuerType
+  tao: string
+  rootTao: string
+}
+
+export type VerifyCredentialIssuerResult = {
+  did: string
+  attributes: Attribute[]
+}
+
 export type DidAgents = TAgent<IResolver & IDIDManager>