# Copyright (c) 2025 Digital Asset (Switzerland) GmbH and/or its affiliates. All rights reserved.
# SPDX-License-Identifier: Apache-2.0

openapi: 3.0.0
info:
  title: transfer instruction off-ledger API
  description: |
    Implemented by token registries for the purpose of supporting the initiation
    of asset transfers; e.g. to settle off-ledger obligations.
  version: 1.0.0
paths:

  /registry/transfer-instruction/v1/transfer-factory:
    post:
      operationId: "getTransferFactory"
      description: |
        Get the factory and choice context for executing a direct transfer.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/GetFactoryRequest"
      responses:
        "200":
          description: ok
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/TransferFactoryWithChoiceContext"
        "400":
          $ref: "#/components/responses/400"
        "404":
          $ref: "#/components/responses/404"


  /registry/transfer-instruction/v1/{transferInstructionId}/choice-contexts/accept:
    post:
      operationId: "getTransferInstructionAcceptContext"
      description: |
        Get the choice context to accept a transfer instruction.
      parameters:
        - name: transferInstructionId
          description: "The contract ID of the transfer instruction to accept."
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/GetChoiceContextRequest"
      responses:
        "200":
          description: ok
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ChoiceContext"
        "400":
          $ref: "#/components/responses/400"
        "404":
          $ref: "#/components/responses/404"

  /registry/transfer-instruction/v1/{transferInstructionId}/choice-contexts/reject:
    post:
      operationId: "getTransferInstructionRejectContext"
      description: |
        Get the choice context to reject a transfer instruction.
      parameters:
        - name: transferInstructionId
          description: "The contract ID of the transfer instruction to reject."
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/GetChoiceContextRequest"
      responses:
        "200":
          description: ok
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ChoiceContext"
        "400":
          $ref: "#/components/responses/400"
        "404":
          $ref: "#/components/responses/404"

  /registry/transfer-instruction/v1/{transferInstructionId}/choice-contexts/withdraw:
    post:
      operationId: "getTransferInstructionWithdrawContext"
      description: |
        Get the choice context to withdraw a transfer instruction.
      parameters:
        - name: transferInstructionId
          description: "The contract ID of the transfer instruction to withdraw."
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/GetChoiceContextRequest"
      responses:
        "200":
          description: ok
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ChoiceContext"
        "400":
          $ref: "#/components/responses/400"
        "404":
          $ref: "#/components/responses/404"

components:
  responses:
    "400":
      description: "bad request"
      content:
        application/json:
          schema:
            $ref: "#/components/schemas/ErrorResponse"
    "404":
      description: "not found"
      content:
        application/json:
          schema:
            $ref: "#/components/schemas/ErrorResponse"

  schemas:
    # Note: intentionally not shared with the other APIs to keep the self-contained, and because not all OpenAPI codegens support such shared definitions.
    GetFactoryRequest:
      type: object
      properties:
        choiceArguments:
          type: object
          description: |
            The arguments that are intended to be passed to the choice provided by the factory.
            To avoid repeating the Daml type definitions, they are specified as JSON objects.
            However the concrete format is given by how the choice arguments are encoded using the Daml JSON API
            (with the `extraArgs.context` and `extraArgs.meta` fields set to the empty object).

            The choice arguments are provided so that the registry can also provide choice-argument
            specific contracts, e.g., the configuration for a specific instrument-id.
        excludeDebugFields:
          description: "If set to true, the response will not include debug fields."
          default: false
          type: boolean
      required:
        [
          "choiceArguments",
        ]

    GetChoiceContextRequest:
      description: |
        A request to get the context for executing a choice on a contract.
      type: object
      properties:
        meta:
          description: |
            Metadata that will be passed to the choice, and should be incorporated
            into the choice context. Provided for extensibility.
          type: object
          additionalProperties:
            type: string

    TransferFactoryWithChoiceContext:
      description: |
        The transfer factory contract together with the choice context required to exercise the choice
        provided by the factory. Typically used to implement the generic initiation of on-ledger workflows
        via a Daml interface.

        Clients SHOULD avoid reusing the same `FactoryWithChoiceContext` for exercising multiple choices,
        as the choice context MAY be specific to the choice being exercised.
      type: object
      properties:
        factoryId:
          description: "The contract ID of the contract implementing the factory interface."
          type: string
        transferKind:
          description: |
            The kind of transfer workflow that will be used:
            * `offer`: offer a transfer to the receiver and only transfer if they accept
            * `direct`: transfer directly to the receiver without asking them for approval.
              Only chosen if the receiver has pre-approved direct transfers.
            * `self`: a self-transfer where the sender and receiver are the same party.
              No approval is required, and the transfer is typically immediate.
          type: string
          enum:
            - "self"
            - "direct"
            - "offer"
        choiceContext:
          $ref: "#/components/schemas/ChoiceContext"
      required:
        [
          "factoryId",
          "choiceContext",
          "transferKind",
        ]

    ChoiceContext:
      description: |
        The context required to exercise a choice on a contract via an interface.
        Used to retrieve additional reference data that is passed in via disclosed contracts,
        which are in turn referred to via their contract ID in the `choiceContextData`.
      type: object
      properties:
        choiceContextData:
          description: "The additional data to use when exercising the choice."
          type: object
        disclosedContracts:
          description: |
            The contracts that are required to be disclosed to the participant node for exercising
            the choice.
          type: array
          items:
            $ref: "#/components/schemas/DisclosedContract"
      required:
        [
          "choiceContextData",
          "disclosedContracts",
        ]

    # Note: intentionally not shared with the other APIs to keep the self-contained, and because not all OpenAPI codegens support such shared definitions.
    DisclosedContract:
      type: object
      properties:
        templateId:
          type: string
        contractId:
          type: string
        createdEventBlob:
          type: string
        synchronizerId:
          description: |
            The synchronizer to which the contract is currently assigned.
            If the contract is in the process of being reassigned, then a "409" response is returned.
          type: string
        debugPackageName:
          description: |
            The name of the Daml package that was used to create the contract.
            Use this data only if you trust the provider, as it might not match the data in the
            `createdEventBlob`.
          type: string
        debugPayload:
          description: |
            The contract arguments that were used to create the contract.
            Use this data only if you trust the provider, as it might not match the data in the
            `createdEventBlob`.
          type: object
        debugCreatedAt:
          description: |
            The ledger effective time at which the contract was created.
            Use this data only if you trust the provider, as it might not match the data in the
            `createdEventBlob`.
          type: string
          format: date-time
      required:
        [
          "templateId",
          "contractId",
          "createdEventBlob",
          "synchronizerId"
        ]

    ErrorResponse:
      type: object
      required:
        - error
      properties:
        error:
          type: string