feat: support w3c revocation

packages/core/package.json

@@ -57,6 +57,7 @@
     "luxon": "^3.3.0",
     "make-error": "^1.3.6",
     "object-inspect": "^1.10.3",
+    "pako": "^2.1.0",
     "query-string": "^7.0.1",
     "reflect-metadata": "^0.1.13",
     "rxjs": "^7.8.0",
@@ -71,6 +72,7 @@
     "@types/jsonpath": "^0.2.4",
     "@types/luxon": "^3.2.0",
     "@types/object-inspect": "^1.8.0",
+    "@types/pako": "^2.0.3",
     "@types/uuid": "^9.0.1",
     "@types/varint": "^6.0.0",
     "nock": "^13.3.0",

packages/core/src/modules/credentials/CredentialsApi.ts

@@ -17,13 +17,18 @@ import type {
   DeleteCredentialOptions,
   SendRevocationNotificationOptions,
   DeclineCredentialOfferOptions,
+  RevokeCredentialOption,
+  BitStringCredential,
+  JsonLdRevocationStatus,
 } from './CredentialsApiOptions'
 import type { CredentialProtocol } from './protocol/CredentialProtocol'
 import type { CredentialFormatsFromProtocols } from './protocol/CredentialProtocolOptions'
 import type { CredentialExchangeRecord } from './repository/CredentialExchangeRecord'
 import type { AgentMessage } from '../../agent/AgentMessage'
 import type { Query, QueryOptions } from '../../storage/StorageService'
 
+import * as pako from 'pako'
+
 import { AgentContext } from '../../agent'
 import { MessageSender } from '../../agent/MessageSender'
 import { getOutboundMessageContext } from '../../agent/getOutboundMessageContext'
@@ -32,10 +37,12 @@ import { CredoError } from '../../error'
 import { Logger } from '../../logger'
 import { inject, injectable } from '../../plugins'
 import { DidCommMessageRepository } from '../../storage/didcomm/DidCommMessageRepository'
+import { Buffer } from '../../utils'
 import { ConnectionService } from '../connections/services'
 import { RoutingService } from '../routing/services/RoutingService'
 
 import { CredentialsModuleConfig } from './CredentialsModuleConfig'
+import { BitstringStatusListEntry, JsonLdCredentialFormat } from './formats'
 import { CredentialState } from './models/CredentialState'
 import { RevocationNotificationService } from './protocol/revocation-notification/services'
 import { CredentialRepository } from './repository/CredentialRepository'
@@ -62,9 +69,12 @@ export interface CredentialsApi<CPs extends CredentialProtocol[]> {
   // Issue Credential Methods
   acceptCredential(options: AcceptCredentialOptions): Promise<CredentialExchangeRecord>
 
-  // Revoke Credential Methods
+  // Revoke JSON-LD credential Methods
   sendRevocationNotification(options: SendRevocationNotificationOptions): Promise<void>
 
+  // Revoke Credential Methods
+  revokeJsonLdCredential(options: RevokeCredentialOption): Promise<{ message: string }>
+
   // out of band
   createOffer(options: CreateCredentialOfferOptions<CPs>): Promise<{
     message: AgentMessage
@@ -515,6 +525,87 @@ export class CredentialsApi<CPs extends CredentialProtocol[]> implements Credent
     return credentialRecord
   }
 
+  /**
+   * Revoke a credential by issuer
+   * associated with the credential record.
+   *
+   * @param credentialRecordId The id of the credential record for which to revoke the credential
+   * @returns Revoke credential notification message
+   *
+   */
+  public async revokeJsonLdCredential(options: RevokeCredentialOption): Promise<{ message: string }> {
+    // Default to '1' (revoked)
+    const revocationStatus = '1' as JsonLdRevocationStatus
+
+    const credentialRecord = await this.getCredentialRecord(options.credentialRecordId)
+    const credentialStatus = this.validateCredentialStatus(credentialRecord)
+
+    const { statusListIndex: credentialIndex, statusListCredential: statusListCredentialURL } = credentialStatus
+    const bitStringCredential = await this.fetchAndValidateBitStringCredential(statusListCredentialURL)
+    const decodedBitString = await this.decodeBitSting(bitStringCredential.credential.credentialSubject.encodedList)
+
+    if (decodedBitString.charAt(Number(credentialIndex)) === revocationStatus) {
+      throw new CredoError('The JSON-LD credential is already revoked')
+    }
+
+    // Update the bit string with the revocation status
+    const updatedBitString = this.updateBitString(decodedBitString, credentialIndex, revocationStatus)
+    bitStringCredential.credential.credentialSubject.encodedList = await this.encodeBitString(updatedBitString)
+
+    await this.postUpdatedBitString(statusListCredentialURL, bitStringCredential)
+
+    return { message: 'The JSON-LD credential has been successfully revoked.' }
+  }
+
+  private async getCredentialRecord(
+    credentialRecordId: string
+  ): Promise<GetCredentialFormatDataReturn<JsonLdCredentialFormat[]>> {
+    return this.getFormatData(credentialRecordId)
+  }
+
+  private validateCredentialStatus(
+    credentialRecord: GetCredentialFormatDataReturn<JsonLdCredentialFormat[]>
+  ): BitstringStatusListEntry {
+    const credentialStatus = credentialRecord.offer?.jsonld?.credential?.credentialStatus
+
+    if (Array.isArray(credentialStatus)) {
+      throw new CredoError('This credential status as an array for JSON-LD credentials is currently not supported')
+    }
+
+    if (!credentialStatus) {
+      throw new CredoError('This JSON-LD credential is non-revocable')
+    }
+
+    return credentialStatus
+  }
+
+  private async fetchAndValidateBitStringCredential(statusListCredentialURL: string): Promise<BitStringCredential> {
+    const response = await fetch(statusListCredentialURL)
+    if (!response.ok) {
+      throw new CredoError(`Failed to fetch credential: ${response.statusText}`)
+    }
+    return response.json() as Promise<BitStringCredential>
+  }
+
+  private updateBitString(decodedBitString: string, credentialIndex: string, revocationStatus: string): string {
+    return [
+      decodedBitString.slice(0, Number(credentialIndex)),
+      revocationStatus,
+      decodedBitString.slice(Number(credentialIndex) + 1),
+    ].join('')
+  }
+
+  private async postUpdatedBitString(
+    statusListCredentialURL: string,
+    bitStringCredential: BitStringCredential
+  ): Promise<void> {
+    await fetch(statusListCredentialURL, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ credentialsData: bitStringCredential }),
+    })
+  }
+
   /**
    * Send a revocation notification for a credential exchange record. Currently Revocation Notification V2 protocol is supported
    *
@@ -705,4 +796,21 @@ export class CredentialsApi<CPs extends CredentialProtocol[]> implements Credent
 
     return this.getProtocol(credentialExchangeRecord.protocolVersion)
   }
+
+  private async encodeBitString(bitString: string): Promise<string> {
+    // Convert the bitString to a Uint8Array
+    const buffer = new TextEncoder().encode(bitString)
+    const compressedBuffer = pako.gzip(buffer)
+    // Convert the compressed buffer to a base64 string
+    return Buffer.from(compressedBuffer).toString('base64')
+  }
+
+  private async decodeBitSting(bitString: string): Promise<string> {
+    // Decode base64 string to Uint8Array
+    const compressedBuffer = Uint8Array.from(atob(bitString), (c) => c.charCodeAt(0))
+
+    // Decompress using pako
+    const decompressedBuffer = pako.ungzip(compressedBuffer, { to: 'string' })
+    return decompressedBuffer
+  }
 }

packages/core/src/modules/credentials/CredentialsApiOptions.ts

@@ -44,6 +44,8 @@ interface BaseOptions {
   goal?: string
 }
 
+export type JsonLdRevocationStatus = '0' | '1'
+
 /**
  * Interface for CredentialsApi.proposeCredential. Will send a proposal.
  */
@@ -171,3 +173,28 @@ export interface DeclineCredentialOfferOptions {
    */
   problemReportDescription?: string
 }
+
+/**
+ * Interface for CredentialsApi.revokeCredential. revoke a jsonld credential by Issuer.
+ */
+export interface RevokeCredentialOption {
+  credentialRecordId: string
+}
+
+export interface CredentialSubject {
+  id: string
+  type: string
+  encodedList: string
+  statusPurpose: string
+}
+
+export interface Credential {
+  credentialSubject: CredentialSubject
+}
+
+/**
+ * Interface for bit string credential. Representing the bit string credential status.
+ */
+export interface BitStringCredential {
+  credential: Credential
+}

packages/core/src/modules/credentials/formats/jsonld/JsonLdCredentialFormat.ts

@@ -11,9 +11,18 @@ export interface JsonCredential {
   issuanceDate: string
   expirationDate?: string
   credentialSubject: SingleOrArray<JsonObject>
+  credentialStatus?: SingleOrArray<BitstringStatusListEntry>
   [key: string]: unknown
 }
 
+export interface BitstringStatusListEntry {
+  id: string
+  type: string
+  statusPurpose: string
+  statusListIndex: string
+  statusListCredential: string
+}
+
 /**
  * Format for creating a jsonld proposal, offer or request.
  */

packages/core/src/modules/vc/data-integrity/VerifyBitStringCredentialStatus.ts

@@ -0,0 +1,71 @@
+import type { AgentContext } from '../../../agent/context'
+import type { W3cJsonCredential } from '../models/credential/W3cJsonCredential'
+import type { BitStringStatusListCredential } from '../models/credential/W3cJsonCredentialStatus'
+
+import * as pako from 'pako'
+
+import { CredoError } from '../../../error'
+import { validateStatus } from '../models/credential/W3cCredentialStatus'
+
+// Function to fetch and parse the bit string status list credential
+const fetchBitStringStatusListCredential = async (
+  agentContext: AgentContext,
+  url: string
+): Promise<BitStringStatusListCredential> => {
+  const response = await agentContext.config.agentDependencies.fetch(url, { method: 'GET' })
+
+  if (!response.ok) {
+    throw new CredoError(`Failed to fetch bit string status list. HTTP Status: ${response.status}`)
+  }
+
+  try {
+    return (await response.json()) as BitStringStatusListCredential
+  } catch (error) {
+    throw new CredoError('Failed to parse the bit string status list credential')
+  }
+}
+
+export const verifyBitStringCredentialStatus = async (credential: W3cJsonCredential, agentContext: AgentContext) => {
+  const { credentialStatus } = credential
+
+  if (Array.isArray(credentialStatus)) {
+    throw new CredoError('Verifying credential status as an array for JSON-LD credentials is currently not supported')
+  }
+
+  if (!credentialStatus || credentialStatus.statusListIndex === undefined) {
+    throw new CredoError('Invalid credential status format')
+  }
+
+  // Validate credentialStatus using the class-based approach
+  const isValid = await validateStatus(credentialStatus, agentContext)
+
+  if (!isValid) {
+    throw new CredoError('Invalid credential status type. Expected BitstringStatusList')
+  }
+
+  // Fetch the bit string status list credential
+  const bitStringStatusListCredential = await fetchBitStringStatusListCredential(
+    agentContext,
+    credentialStatus.statusListCredential
+  )
+
+  // Decode the encoded bit string
+  const encodedBitString = bitStringStatusListCredential.credential.credentialSubject.encodedList
+  const compressedBuffer = Uint8Array.from(atob(encodedBitString), (char) => char.charCodeAt(0))
+
+  // Decompress the bit string using pako
+  const decodedBitString = pako.ungzip(compressedBuffer, { to: 'string' })
+  const statusListIndex = Number(credentialStatus.statusListIndex)
+
+  // Ensure the statusListIndex is within bounds
+  if (statusListIndex < 0 || statusListIndex >= decodedBitString.length) {
+    throw new CredoError('Status list index is out of bounds')
+  }
+
+  // Check if the credential is revoked
+  if (decodedBitString[statusListIndex] === '1') {
+    throw new CredoError(`Credential at index ${credentialStatus.statusListIndex} is revoked.`)
+  }
+
+  return true
+}

packages/core/src/modules/vc/data-integrity/W3cJsonLdCredentialService.ts

@@ -21,6 +21,7 @@ import { W3cCredentialsModuleConfig } from '../W3cCredentialsModuleConfig'
 import { w3cDate } from '../util'
 
 import { SignatureSuiteRegistry } from './SignatureSuiteRegistry'
+import { verifyBitStringCredentialStatus } from './VerifyBitStringCredentialStatus'
 import { deriveProof } from './deriveProof'
 import { assertOnlyW3cJsonLdVerifiableCredentials } from './jsonldUtil'
 import jsonld from './libraries/jsonld'
@@ -109,10 +110,9 @@ export class W3cJsonLdCredentialService {
         credential: JsonTransformer.toJSON(options.credential),
         suite: suites,
         documentLoader: this.w3cCredentialsModuleConfig.documentLoader(agentContext),
-        checkStatus: ({ credential }: { credential: W3cJsonCredential }) => {
-          // Only throw error if credentialStatus is present
+        checkStatus: async ({ credential }: { credential: W3cJsonCredential }) => {
           if (verifyCredentialStatus && 'credentialStatus' in credential) {
-            throw new CredoError('Verifying credential status for JSON-LD credentials is currently not supported')
+            await verifyBitStringCredentialStatus(credential, agentContext)
           }
           return {
             verified: true,
@@ -265,6 +265,14 @@ export class W3cJsonLdCredentialService {
         challenge: options.challenge,
         domain: options.domain,
         documentLoader: this.w3cCredentialsModuleConfig.documentLoader(agentContext),
+        checkStatus: async ({ credential }: { credential: W3cJsonCredential }) => {
+          if ('credentialStatus' in credential) {
+            await verifyBitStringCredentialStatus(credential, agentContext)
+          }
+          return {
+            verified: true,
+          }
+        },
       }
 
       // this is a hack because vcjs throws if purpose is passed as undefined or null