feat: add revocation functions

services/credentials-service/package.json

@@ -35,6 +35,7 @@
     "@nestjs/swagger": "^6.1.4",
     "@nestjs/terminus": "^9.1.4",
     "@prisma/client": "4.8.1",
+    "@techsavvyash/bitstring": "^3.2.0",
     "@types/uuid": "^9.0.1",
     "ajv": "^8.12.0",
     "did-jwt-vc": "^3.1.0",

services/credentials-service/prisma/migrations/20230908143914_add_revocation_apis/migration.sql

@@ -0,0 +1,9 @@
+-- CreateTable
+CREATE TABLE "RevocationLists" (
+    "issuer" TEXT NOT NULL,
+    "latestRevocationListId" TEXT NOT NULL,
+    "lastCredentialIdx" INTEGER NOT NULL,
+    "allRevocationLists" TEXT[],
+
+    CONSTRAINT "RevocationLists_pkey" PRIMARY KEY ("issuer")
+);

services/credentials-service/prisma/schema.prisma

@@ -37,3 +37,10 @@ model VerifiableCredentials {
   updatedBy         String?
   tags              String[]
 }
+
+model RevocationLists {
+  issuer                 String   @id
+  latestRevocationListId String
+  lastCredentialIdx      Int
+  allRevocationLists     String[]
+}

services/credentials-service/src/app.module.ts

@@ -7,15 +7,20 @@ import { CredentialsModule } from './credentials/credentials.module';
 import { TerminusModule } from '@nestjs/terminus';
 import { HealthCheckUtilsService } from './credentials/utils/healthcheck.utils.service';
 import { PrismaClient } from '@prisma/client';
+import { RevocationList } from './revocation-list/revocation-list.helper';
+import { RevocationListImpl } from './revocation-list/revocation-list.impl';
+import { RevocationListService } from './revocation-list/revocation-list.service';
+import { RevocationListModule } from './revocation-list/revocation-list.module';
 
 @Module({
   imports: [
     HttpModule,
     ConfigModule.forRoot({ isGlobal: true }),
     CredentialsModule,
-    TerminusModule
+    TerminusModule,
+    RevocationListModule
   ],
   controllers: [AppController],
-  providers: [AppService, ConfigService, PrismaClient, HealthCheckUtilsService],
+  providers: [AppService, ConfigService, PrismaClient, HealthCheckUtilsService, RevocationList, RevocationListImpl, RevocationListService],
 })
 export class AppModule {}

services/credentials-service/src/credentials/credentials.module.ts

@@ -11,5 +11,6 @@ import { PrismaClient } from '@prisma/client';
   imports: [HttpModule],
   providers: [CredentialsService, PrismaClient, IdentityUtilsService, RenderingUtilsService, SchemaUtilsSerivce],
   controllers: [CredentialsController],
+  exports: [IdentityUtilsService]
 })
 export class CredentialsModule {}

services/credentials-service/src/revocation-list/revocation-list.helper.ts

@@ -0,0 +1,36 @@
+// @ts-ignore
+import { Bitstring } from '@techsavvyash/bitstring';
+
+type BitstringConstructorParam = {
+  length?: number,
+  buffer?: Uint8Array
+};
+
+export class RevocationList {
+
+  private bitstring: any;
+  constructor({ length, buffer }: BitstringConstructorParam = { length: 100000 }) {
+    this.bitstring = new Bitstring({ length, buffer });
+  }
+
+  setRevoked(index, revoked) {
+    if (typeof revoked !== 'boolean') {
+      throw new TypeError('revoked must be a boolean.');
+    }
+
+    return this.bitstring.set(index, revoked);
+  }
+
+  isRevoked(index) {
+    return this.bitstring.get(index);
+  }
+
+  async encode() {
+    return this.bitstring.encodeBits();
+  }
+
+  static async decode({ encodedList }) {
+    const buffer = await Bitstring.decodeBits({ encoded: encodedList });
+    return new RevocationList({ buffer });
+  }
+}

services/credentials-service/src/revocation-list/revocation-list.impl.ts

@@ -0,0 +1,15 @@
+import { Injectable } from '@nestjs/common';
+import { RevocationList } from './revocation-list.helper';
+
+@Injectable()
+export class RevocationListImpl {
+  constructor() {}
+
+  public createList({ length }) {
+    return new RevocationList({ length });
+  }
+
+  public async decodeList({ encodedList }) {
+    return await RevocationList.decode({ encodedList });
+  }
+}

services/credentials-service/src/revocation-list/revocation-list.module.ts

@@ -0,0 +1,14 @@
+import { Module } from '@nestjs/common';
+import { RevocationListService } from './revocation-list.service';
+import { RevocationList } from './revocation-list.helper';
+import { PrismaClient } from '@prisma/client';
+import { RevocationListImpl } from './revocation-list.impl';
+import { CredentialsModule } from 'src/credentials/credentials.module';
+import { IdentityUtilsService } from 'src/credentials/utils/identity.utils.service';
+import { HttpModule, HttpService } from '@nestjs/axios';
+
+@Module({
+  imports: [HttpModule],
+  providers: [RevocationList, RevocationListService, PrismaClient, RevocationListImpl, IdentityUtilsService]
+})
+export class RevocationListModule {}

services/credentials-service/src/revocation-list/revocation-list.service.spec.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { RevocationListService } from './revocation-list.service';
+
+describe('RevocationListService', () => {
+  let service: RevocationListService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [RevocationListService],
+    }).compile();
+
+    service = module.get<RevocationListService>(RevocationListService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});