openapi: 3.0.0
info:
  version: 1.0.0
  title: golang-rest-example
  license:
    name: MIT
    url: https://opensource.org/license/MIT/
  description: >
    Example OpenAPI Golang server.
servers:
  - url: http://localhost:1234
    description: Local server
tags:
  - name: health
    description: Health check
  - name: users
    description: User management
  - name: groups
    description: Group management
paths:
  /healthz:
    description: Health check
    get:
      tags:
        - health
      responses:
        '200':
          $ref: '#/components/responses/Ok'
        default:
          $ref: '#/components/responses/UnexpectedError'
  /users:
    get:
      description: Get all users
      tags:
        - users
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/User'
        default:
          $ref: '#/components/responses/UnexpectedError'
    post:
      description: Create user
      tags:
        - users
      requestBody:
        description: User object
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UserUpdate'
      responses:
        '201':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        default:
          $ref: '#/components/responses/UnexpectedError'
  /users/{id}:
    get:
      description: Get user by id
      tags:
        - users
      parameters:
        - name: id
          in: path
          required: true
          schema:
            $ref: '#/components/schemas/Id'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '404':
          $ref: '#/components/responses/NotFound'
        default:
          $ref: '#/components/responses/UnexpectedError'
    put:
      description: Update user by id
      tags:
        - users
      parameters:
        - name: id
          in: path
          required: true
          schema:
            $ref: '#/components/schemas/Id'
      requestBody:
        description: User object
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UserUpdate'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/User'
        '404':
          $ref: '#/components/responses/NotFound'
        default:
          $ref: '#/components/responses/UnexpectedError'
    delete:
      description: Delete user by id
      tags:
        - users
      parameters:
        - name: id
          in: path
          required: true
          schema:
            $ref: '#/components/schemas/Id'
      responses:
        '200':
          $ref: '#/components/responses/Ok'
        '404':
          $ref: '#/components/responses/NotFound'
        default:
          $ref: '#/components/responses/UnexpectedError'
  /groups:
    get:
      description: Get all groups
      tags:
        - groups
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Group'
        default:
          $ref: '#/components/responses/UnexpectedError'
    post:
      description: Create group
      tags:
        - groups
      requestBody:
        description: Group object
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GroupUpdate'
      responses:
        '201':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Group'
        default:
          $ref: '#/components/responses/UnexpectedError'
  /groups/{id}:
    get:
      description: Get group by id
      tags:
        - groups
      parameters:
      - name: id
        in: path
        required: true
        schema:
          $ref: '#/components/schemas/Id'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Group'
        '404':
          $ref: '#/components/responses/NotFound'
        default:
          $ref: '#/components/responses/UnexpectedError'
    put:
      description: Update group by id
      tags:
        - groups
      parameters:
      - name: id
        in: path
        required: true
        schema:
          $ref: '#/components/schemas/Id'
      requestBody:
        description: Group object
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GroupUpdate'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Group'
        '404':
          $ref: '#/components/responses/NotFound'
        default:
          $ref: '#/components/responses/UnexpectedError'
    delete:
      description: Delete group by id
      tags:
        - groups
      parameters:
      - name: id
        in: path
        required: true
        schema:
          $ref: '#/components/schemas/Id'
      responses:
        '200':
          $ref: '#/components/responses/Ok'
        '404':
          $ref: '#/components/responses/NotFound'
        default:
          $ref: '#/components/responses/UnexpectedError'
components:
  responses:
    Ok:
      description: OK
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Ok'
    NotFound:
      description: Not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    UnexpectedError:
      description: Unexpected error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Ok:
      type: object
      required:
        - message
      properties:
        message:
          type: string
          example: OK
    Error:
      type: object
      required:
        - message
        - code
      properties:
        message:
          type: string
          example: Not found
        code:
          type: integer
          example: 404
    Id:
      type: integer
      format: int64
      example: 1
    User:
      type: object
      required:
        - id
        - name
        - email
        - group_id
      properties:
        id:
          $ref: '#/components/schemas/Id'
        name:
          type: string
          example: John
        email:
          type: string
          example: john@example.com
        group_id:
          $ref: '#/components/schemas/Id'
    UserUpdate:
      type: object
      required:
        - name
        - email
        - group_id
      properties:
        name:
          type: string
          example: John
        email:
          type: string
          example: john@example.com
        group_id:
          $ref: '#/components/schemas/Id'
    Group:
      type: object
      required:
        - id
        - name
        - user_ids
      properties:
        id:
          $ref: '#/components/schemas/Id'
        name:
          type: string
          example: admins
        user_ids:
          type: array
          items:
            $ref: '#/components/schemas/Id'
    GroupUpdate:
      type: object
      required:
        - name
      properties:
        name:
          type: string
          example: admins