api.yaml

openapi: 3.0.3
info:
  title: vcverifier
  description: Backend component to verify credentials
  version: 0.0.1
tags:
  - name: frontend
    description: All endpoints that belong to the frontend-application part
  - name: api
    description: All api-endpoints, e.g. the once that can be reused by other applications
    
paths:
  /api/v1/loginQR:
    get:
      tags:
        - frontend
      parameters:
        - $ref: '#/components/parameters/QueryState'
        - $ref: '#/components/parameters/ClientCallback'
        - $ref: '#/components/parameters/ClientId'
      operationId: VerifierPageDisplayQRSIOP
      summary: Presents a qr as starting point for the auth process
      description: Returns a rendered html with a QR encoding the login-starting point for the siop flow - e.g. 'openid://?scope=somethign&response_type=rt&response_mode=rm&client_id=ci&redirect_uri=uri&state=state&nonce=nonce'
      responses:
        '200':
          description: A rendered page, containing the qr
          content:
            text/html:
              schema:
                type: object
        '400':
          description: In case of broken requests.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorMessage'

  /api/v1/samedevice:
    get:
      tags:
        - api
      parameters:
        - $ref: '#/components/parameters/QueryState'
        - $ref: '#/components/parameters/ClientId'
      operationId: StartSIOPSameDevice
      summary: Starts the siop flow for credentials hold by the same device
      description: When the credential is already present in the requesting browser, the same-device flow can be used. It creates the login information and then redirects to the /authenticationresponse path.
      responses: 
        '302':
          description: A redirect to the authenticationresponse path, containing scope, response_type, client_id, redirect_uri, state and nonce to be used for the request
  
  /api/v1/startsiop:
    get:
      tags:
        - api 
      parameters:
        - $ref: '#/components/parameters/QueryState'
        - $ref: '#/components/parameters/ClientCallback'
      operationId: VerifierAPIStartSIOP
      summary: Initiates the siop flow and returns the 'openid://...' connection string
      responses:
        '200': 
          description: The connection string 
          content:
            text/plain:
              schema:
                type: string
                example: openid://?scope=dsba.credentials.presentation.PacketDeliveryService&response_type=vp_token&response_mode=post&client_id=did:key:z6MktZy7CErCqdLvknH6g9YNVpWupuBNBNovsBrj4DFGn4R1&redirect_uri=http://localhost:3000/verifier/api/v1/authenticationresponse&state=&nonce=BfEte4DFdlmdO7a_fBiXTw        

  /api/v1/authentication_response:
    post:
      tags:
        - api 
      parameters:
        - $ref: '#/components/parameters/QueryState'
        - $ref: '#/components/parameters/ClientId'
      operationId: VerifierAPIAuthenticationResponse
      summary: Stores the credential for the given session
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/AuthenticationResponse'
      responses:
        '204':  
          description: Ok when it worked
    get:
      tags:
        - api
      parameters:
        - $ref: '#/components/parameters/QueryState'
        - $ref: '#/components/parameters/VpToken'
        - $ref: '#/components/parameters/PresentationSubmission'
      operationId: GetVerifierAPIAuthenticationResponse
      summary: Stores the credential for the given session
      responses:
        '204':  
          description: Ok when it worked
        
  /token:
    post:
      tags:
        - api
      operationId: GetToken
      summary: Token endpoint to exchange the authorization code with the actual JWT.
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/TokenRequest'
      responses:
        '200':
          description: The pre-generated token 
          content:
            application/json:
              schema: 
                $ref: '#/components/schemas/TokenResponse'
        '403':
          description: Whenever something is requested that is not allowed or existent
          content:
            application/json:
              schema: 
                $ref: '#/components/schemas/ErrorMessage'
  /.well-known/jwks:
    get: 
      tags:
        - api
      operationId: VerifierAPIJWKS
      summary: Provides the public keys for the given verifier, to be used for verifing the JWTs
      responses:
        '200': 
          description: The list of public keys, belonging to the issuer
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/JWKSet'
  /services/{serviceIdentifier}/.well-known/openid-configuration:
    get:
      tags:
        - api
      operationId: VerifierAPIOpenIDConfiguration
      summary: Returns the configuration of the OpenID Provider
      responses:
        '200':
          description: OpenID Provider Metadata
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OpenIDProviderMetadata'

  /info:
    get: 
      tags:
        - base
      operationId: GetBackendInfo
      summary: Returns the issuer and verifier did, generated on startup
      responses:
        '200':
          description: Object containing the info
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BackendInfo'
                
components:
  parameters:
    Id:
      name: id
      in: path
      required: true
      schema:
        type: string
        example: urn:uuid:274e7465-cc9d-4cad-b75f-190db927e56a
    State:
      name: state
      in: path
      required: true
      schema: 
        type: string
        example: 274e7465-cc9d-4cad-b75f-190db927e56a
    QueryState:
      name: state
      in: query
      required: true
      schema: 
        type: string
        example: 274e7465-cc9d-4cad-b75f-190db927e56a
    ClientCallback:
      name: client_callback
      description: Endpoint of the client to receive the jwt.
      in: query
      required: true
      schema:
        type: string
        format: url
        example: "https://my-portal.com/auth_callback"
    QueryId:
      name: id
      in: query
      required: true
      schema:
        type: string
        example: urn:uuid:274e7465-cc9d-4cad-b75f-190db927e56a
    RedirectUri:
      name: redirect_uri
      in: query
      required: true
      schema:
        type: string
        example: https://my-verifier.com/verifier/api/v1/authenticationresponse
    VpToken:
      name: vp_token
      description: base64URLEncoded VerifiablePresentation
      in: query
      required: true
      schema: 
        type: string
    PresentationSubmission:
      name: presentation_submission
      description: base64URLEncoded PresentationSubmission as specified by https://identity.foundation/presentation-exchange/#presentation-submission
      in: query
      required: true
      schema:
        type: string
    ClientId:
      name: client_id
      description: The id of the client/service that intents to start the authentication flow. Will be used to retrieve the scope and trust services to be used for verification.
      in: query
      required: false 
      schema: 
        type: string
        example: packet-delivery-portal
  schemas:
    CredentialsType:
      type: array
      items:
        type: string
      example:
        - PacketDeliveryService
        - VerifiableCredential
    Did:
      type: object
      properties:
        id:
          type: string
          format: did
          example: did:key:z6Mks9m9ifLwy3JWqH4c57EbBQVS2SpRCjfa79wHb5vWM6vh
    Date:
      type: string
      format: date-time
      example: 2023-01-06T07:51:36Z
    Proof:
      type: object
      properties:
        type:
          type: string
          example: JsonWebSignature2020
        creator: 
          type: string
          format: did
          example: did:key:z6Mks9m9ifLwy3JWqH4c57EbBQVS2SpRCjfa79wHb5vWM6vh
        created:
          $ref: '#/components/schemas/Date'
        verificationMethod:
          type: string
          example: did:key:z6Mks9m9ifLwy3JWqH4c57EbBQVS2SpRCjfa79wHb5vWM6vh#z6Mks9m9ifLwy3JWqH4c57EbBQVS2SpRCjfa79wHb5vWM6vh
        jws:
          type: string
          example: eyJiNjQiOmZhbHNlLCJjcml0IjpbImI2NCJdLCJhbGciOiJFZERTQSJ9..6xSqoZja0NwjF0af9Zknqx3Cbh9GENunBf9C8uL2ulGfwus3UFM_ZnhPjWtHPl-72E9p3BT5f2ptZoYktMKpDA
    BackendInfo:
      type: object
      properties:
        issuerDid:
          $ref: '#/components/schemas/Did'
        verifierDid:
          $ref: '#/components/schemas/Did'
    Descriptor:
      type: object
      properties: 
        id: 
          type: string
          description: The value of this property MUST be a string that matches the id property of the Input Descriptor in the Presentation Definition that this Presentation Submission is related to.
          example: id_credential
        format:
          type: string
          description: The value of this property MUST be a string that matches one of the Claim Format Designation. This denotes the data format of the Claim.
          example: ldp_vc
        path:
          type: string
          description: The value of this property MUST be a JSONPath string expression. The path property indicates the Claim submitted in relation to the identified Input Descriptor, when executed against the top-level of the object the Presentation Submission is embedded within.
          example: $
        path_nested:
          $ref: '#/components/schemas/Descriptor'
      required:
        - id
        - format
        - path
    PresentationSubmission:
      type: object
      description: PresentationSubmission as specified by https://identity.foundation/presentation-exchange/#presentation-submission
      properties:
        id: 
          type: string
          description: Must be a string that matches the id property of the Input Descriptor in the Presentation Definition that this Presentation Submission is related to.
        definition_id:
          type: string
          description: Must be the ID of a valid PresentationDefinition
          example: 32f54163-7166-48f1-93d8-ff217bdb0653
        descriptor_map:
          type: array
          items:
            $ref: '#/components/schemas/Descriptor'
      required:
        - id
        - definition_id
        - descriptor_map
    AuthenticationResponse:
      type: object
      properties:
        presentation_submission:
          $ref: '#/components/schemas/PresentationSubmission'
        vp_token:
          $ref: '#/components/schemas/VerifiablePresentation'
      required:
        - presentation_submission
        - vp_token
    VerifiablePresentation:
      description: Presentation, containing on or more credentials
      type: object
      properties:
        '@context':
          type: array
          items:
            type: string
            format: uri
          example:
          - https://www.w3.org/2018/credentials/v1
        type:
          type: array 
          items:
            type: string
            enum: ["VerifiablePresentation"]
        verifiableCredential: 
          type: array
          items:
            $ref: '#/components/schemas/VerifiableCredential'
        id:
          type: string
          example: ebc6f1c2
        holder:
          $ref: '#/components/schemas/Did'
        proof:
          $ref: '#/components/schemas/Proof'
    VerifiableCredential:
      description: Credential in the format ldp_vc
      type: object
      properties:
        types:
          $ref: '#/components/schemas/CredentialsType'
        '@context':
          type: array
          items:
            type: string
            format: uri
          example:
            - https://www.w3.org/2018/credentials/v1
            - https://w3id.org/security/suites/jws-2020/v1
        credentialsSubject:
          description: A JSON object containing a list of key value pairs, where the key identifies the claim offered in the Credential. The value MAY be a dictionary, which allows to represent the full (potentially deeply nested) structure of the verifiable credential to be issued.
          type: object
      additionalProperties: true
      required:
        - '@context'
        - types
        - format

    JWK:
      type: object
      properties:
        kid:
          type: string
          example: 179d7b56-6598-4045-9a32-4635e8b0f605
        kty:
          type: string
          example: EC
        use:
          type: string
          example: sig
        alg:
          type: string
          example: ES256
        crv:
          type: string
          example: P-256
        x:
          type: string
          example: 3ctHY_0KJW5ezT-oF39t3wPX6XlggWKOSPFW8iooBXk
        y:
          type: string
          example: HXA4mBHgObIE56E92yxN5bYQ27wSxlVPfuNWaY06TTI
        n:
          type: string
        e:
          type: string
        d:
          type: string
    JWKSet:
      type: object
      properties: 
        keys: 
         type: array
         items:
          $ref: '#/components/schemas/JWK'
    OpenIDProviderMetadata:
      type: object
      properties:
        issuer:
          type: string
          example: https://api-test.ebsi.eu/authorisation/v4
        authorization_endpoint:
          type: string
          example: https://api-test.ebsi.eu/authorisation/v4/authorize
        token_endpoint:
          type: string
          example: https://api-test.ebsi.eu/authorisation/v4/token
        presentation_definition_endpoint:
          type: string
          example: https://api-test.ebsi.eu/authorisation/v4/presentation-definitions
        jwks_uri:
          type: string
          example: https://api-test.ebsi.eu/authorisation/v4/jwks
        scopes_supported:
          type: array
          items:
            type: string
          example: ["openid","didr_invite","didr_write","tir_invite","tir_write"]
        response_types_supported:
          type: array
          items:
            type: string
          example: ["token"]
        response_mode_supported:
          type: array
          items:
            type: string
          example: ["query","fragment"]
        grant_types_supported:
          type: array
          items:
            type: string
          example: ["vp_token"]
        subject_types_supported:
          type: array
          items:
            type: string
          example: ["public"]
        id_token_signing_alg_values_supported:
          type: array
          items:
            type: string
          example: ["ES256"]
        request_object_signing_alg_values_supported:
          type: array
          items:
            type: string
          example: ["ES256"]
        request_parameter_supported:
          type: boolean
          example: true
        token_endpoint_auth_methods_supported:
          type: array
          items:
            type: string
          example: ["private_key_jwt"]
    ErrorMessage:
      type: object
      properties:
        summary:
          type: string
          example: Missing Input
        details:
          type: string
          example: Expected 'state' as a query parameter.
    TokenRequest:
      type: object
      properties:
        grant_type: 
          type: string
          enum: ["authorization_code"]
        code:
          type: string
          example: myRandomString
        redirect_uri:
          type: string
          format: uri
          description: Same uri as provided as callback in the original request.
          example: https://my-portal.com/auth_callback
    TokenResponse:
      type: object
      properties:
        token_type:
          type: string
          enum: ["Bearer"]
        expires_in: 
          type: number
          example: 3600
        access_token:
          type: string