rabobank-blockchain/vp-toolkit

/*
 * Copyright 2020 Coöperatieve Rabobank U.A.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { IVerifiablePresentationParams, VerifiablePresentation } from 'vp-toolkit-models'
import { VerifiablePresentationSigner } from '../..'

export class VerifiablePresentationGenerator {

  public constructor (private _signer: VerifiablePresentationSigner) {
  }

  /**
   * Generate a signed Verifiable Presentation (VP) object.
   *
   * Because CryptUtil is being used by the VerifiablePresentationSigner,
   * we need to provide accountIds and keyIds so the
   * VP is provided with the correct ownership proofs.
   * If you use only one global key for your product,
   * then provide the accountId and keyId once.
   *
   * The VP proof array will be overwritten with a Proof set.
   * Proof chains are not supported.
   * @see https://w3c-dvcg.github.io/ld-proofs/#proof-sets
   *
   * @param {IVerifiablePresentationParams} params the proof will be overwritten!
   * @param {{accountId: number, keyId: number}[]} keys used to prove ownership over each VC inside
   * @param {string|undefined} correspondenceId optional value to use as proof.nonce field
   * @return VerifiablePresentation
   */
  public generateVerifiablePresentation (
    params: IVerifiablePresentationParams,
    keys: { accountId: number, keyId: number }[],
    correspondenceId?: string
  ): VerifiablePresentation {
    params.proof = this._signer.generateProofs(params, keys, correspondenceId)
    return new VerifiablePresentation(params)
  }
}