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#  ============LICENSE_START=======================================================
#  Copyright (C) 2024 Nordix Foundation
#  ================================================================================
#  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.
#
#  SPDX-License-Identifier: Apache-2.0
#  ============LICENSE_END=========================================================

openapi: 3.0.3
info:
  title: Policy Executor
  description: "Allows NCMP to execute a policy defined by a third party implementation before proceeding with a CM operation"
  version: 1.0.0
servers:
  - url: /policy-executor/api
tags:
  - name: policy-executor
    description: "Execute all your policies"
paths:
  /v1/{action}:
    post:
      description: "Fire a Policy action"
      operationId: executePolicyAction
      parameters:
        - $ref: '#/components/parameters/authorizationInHeader'
        - $ref: '#/components/parameters/actionInPath'
      requestBody:
        required: true
        description: "The action request body"
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PolicyExecutionRequest'
      tags:
        - policy-executor
      responses:
        '200':
          description: "Successful policy execution"
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PolicyExecutionResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
        '500':
          $ref: '#/components/responses/InternalServerError'

components:
  securitySchemes:
    bearerAuth:
      type: http
      description: "Bearer token (from client that called CPS-NCMP),used by policies to identify the client"
      scheme: bearer
  schemas:
    ErrorMessage:
      type: object
      title: Error
      properties:
        status:
          type: string
        message:
          type: string
        details:
          type: string

    Payload:
      type: object
      properties:
        targetFdn:
          type: string
          description: "The complete FDN (Fully Distinguished Name) for the element to be changed"
          example: "/Subnetwork=Ireland/MeContext=Athlone/ManagedElement=Athlone/SomeFunction=1/Cell=12"
        cmHandleId:
          type: string
          description: "The CM handle ID (optional)"
          example: "F811AF64F5146DFC545EC60B73DE948E"
        resourceIdentifier:
          type: string
          description: "The resource identifier (optional)"
          example: "ManagedElement=Athlone/SomeFunction=1/Cell=12"
        cmChangeRequest:
          type: object
          description: "The content of the change to be made"
          example: '{"Cell":[{"id":"Cell-id","attributes":{"administrativeState":"UNLOCKED"}}]}'
      required:
        - targetFdn
        - cmChangeRequest

    PolicyExecutionRequest:
      type: object
      properties:
        payloadType:
          type: string
          description: "The type of payload. Currently supported options: 'cm_write'"
          example: "cm_write"
        decisionType:
          type: string
          description: "The type of decision. Currently supported options: 'permit'"
          example: "permit"
        payload:
          type: array
          items:
            $ref: '#/components/schemas/Payload'
      required:
        - payloadType
        - decisionType
        - payload

    PolicyExecutionResponse:
      type: object
      properties:
        decisionId:
          type: string
          description: "Unique ID for the decision (for auditing purposes)"
          example: "550e8400-e29b-41d4-a716-446655440000"
        decision:
          type: string
          description: "The decision outcome. Currently supported values: 'permit','deny'"
          example: "deny"
        message:
          type: string
          description: "Additional information regarding the decision outcome"
          example: "Object locked due to recent change"
      required:
        - decisionId
        - decision
        - message

  responses:
    NotFound:
      description: "The specified resource was not found"
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorMessage'
          example:
            status: 404
            message: "Resource Not Found"
            details: "The requested resource is not found"
    Unauthorized:
      description: "Unauthorized request"
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorMessage'
          example:
            status: 401
            message: "Unauthorized request"
            details: "This request is unauthorized"
    Forbidden:
      description: "Request forbidden"
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorMessage'
          example:
            status: 403
            message: "Request Forbidden"
            details: "This request is forbidden"
    BadRequest:
      description: "Bad request"
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorMessage'
          example:
            status: 400
            message: "Bad Request"
            details: "The provided request is not valid"

    InternalServerError:
      description: "Internal server error"
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorMessage'
          example:
            status: 500
            message: "Internal Server Error"
            details: "Internal server error occurred"

    NotImplemented:
      description: "Method not (yet) implemented"
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorMessage'
          example:
            status: 501
            message: "Not Implemented"
            details: "Method not implemented"

  parameters:
    actionInPath:
      name: action
      in: path
      description: "The policy action. Currently supported options: 'execute'"
      required: true
      schema:
        type: string
        example: "execute"
    authorizationInHeader:
      name: Authorization
      in: header
      description: "Bearer token may be used to identify client as part of a policy"
      schema:
        type: string

security:
  - bearerAuth: []