Support OpenID Connect for Verifiable Credential Issuance

[sudeshrshetty]

• [ ] Dynamic Registration: https://github.com/trustbloc/wallet/issues/1586
• [ ] Registering issuers with wallet (pre-known issuers): https://github.com/trustbloc/wallet/issues/1587
• [ ] Initiate issuance flow:
  • [ ] discovery
    • [ ] issuer - hosting configurations for discovery
    • [ ] issuer - Issuance Initiation Endpoint
    • [x] wallet - discover & read issuer configurations
  • [x] fetch credential manifest
  • [ ] authorize flow
    • [x] basic authorize request using claims, (Basic minimal flow)
    • [ ] basic authorize request using claims scopes (advanced flow)
    • [ ] advanced authorization request using vp_token, presentation_submission (advanced PExch Flow)
    • [ ] advanced authorization request using wallet_issuer, user_hint, op_state (advanced flow, for interop)
    • [ ] authorization endpoint in issuer
    • [ ] user login (basic flow)
      • [ ] issuer - OIDC provider
      • [ ] wallet - OIDC client
    • [ ] token endpoint
      • [ ] access token for credential endpoint
      • [ ] id token
      • [ ] refresh token
• [ ] Direct VC flow
  • [ ] Issuer:
    • [ ] Implement credential endpoint
      • call vc service issue credential
    • [ ] Implement credential deferred endpoint
      • call vc service issue credential
  • [ ] Wallet: call credential endpoint
• [ ] Deferred VC flow
• [ ] User consent & Save credential
• [ ] wallet UI
  • [x] routing incoming OIDC initiate issuance, save #1629
  • [x] basic JS API for read issuer configuration & send authorize request #1629
  • [ ] standard & common routing mechanism for all incoming OIDC requests #1619
  • [x] basic UI for OIDC save #1634
  • [ ] support for multiple credentials #1640
  • [ ] standard UI for OIDC save
  • [ ] error handling
  • [ ] credential flow with proof of possession of key (did, sub_jwk, proof)
  • [ ] deferred credential flow
• [ ] Mock Issuer for OIDC issuance flow
  • [x] initiate issuance https://github.com/trustbloc/wallet/issues/1588
  • [x] authorize https://github.com/trustbloc/wallet/issues/1589
  • [x] token endpoint https://github.com/trustbloc/wallet/issues/1635
  • [x] credential endpoint https://github.com/trustbloc/wallet/issues/1590
  • [ ] credential deferred endpoint https://github.com/trustbloc/wallet/issues/1636