tictactoe.yaml

openapi: 3.1.0
info:
  title: Tic Tac Toe
  description: |
    This API allows writing down marks on a Tic Tac Toe board
    and requesting the state of the board or of individual squares.
  version: 1.0.0
tags:
  - name: Gameplay
paths:
  # Whole board operations
  /board:
    get:
      summary: Get the whole board
      description: Retrieves the current state of the board and the winner.
      tags:
        - Gameplay
      operationId: get-board
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/status'
      security:
        - defaultApiKey: []
        - app2AppOauth:
            - board:read
  # Single square operations
  /board/{row}/{column}:
    parameters:
      - $ref: '#/components/parameters/rowParam'
      - $ref: '#/components/parameters/columnParam'
    get:
      summary: Get a single board square
      description: Retrieves the requested square.
      tags:
        - Gameplay
      operationId: get-square
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/mark'
        '400':
          description: The provided parameters are incorrect
          content:
            text/html:
              schema:
                $ref: '#/components/schemas/errorMessage'
              example: Illegal coordinates
      security:
        - bearerHttpAuthentication: []
        - user2AppOauth:
            - board:read
    put:
      summary: Set a single board square
      description: Places a mark on the board and retrieves the whole board and the winner (if any).
      tags:
        - Gameplay
      operationId: put-square
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/mark'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/status'
        '400':
          description: The provided parameters are incorrect
          content:
            text/html:
              schema:
                $ref: '#/components/schemas/errorMessage'
              examples:
                illegalCoordinates:
                  value: Illegal coordinates.
                notEmpty:
                  value: Square is not empty.
                invalidMark:
                  value: Invalid Mark (X or O).
      security:
        - bearerHttpAuthentication: []
        - user2AppOauth:
            - board:write
components:
  parameters:
    rowParam:
      description: Board row (vertical coordinate)
      name: row
      in: path
      required: true
      schema:
        $ref: '#/components/schemas/coordinate'
    columnParam:
      description: Board column (horizontal coordinate)
      name: column
      in: path
      required: true
      schema:
        $ref: '#/components/schemas/coordinate'
  schemas:
    errorMessage:
      type: string
      maxLength: 256
      description: A text message describing an error
    coordinate:
      type: integer
      minimum: 1
      maximum: 3
      example: 1
    mark:
      type: string
      enum:
        - .
        - X
        - O
      description: Possible values for a board square. `.` means empty square.
      example: .
    board:
      type: array
      maxItems: 3
      minItems: 3
      items:
        type: array
        maxItems: 3
        minItems: 3
        items:
          $ref: '#/components/schemas/mark'
    winner:
      type: string
      enum:
        - .
        - X
        - O
      description: Winner of the game. `.` means nobody has won yet.
      example: .
    status:
      type: object
      properties:
        winner:
          $ref: '#/components/schemas/winner'
        board:
          $ref: '#/components/schemas/board'
  securitySchemes:
    defaultApiKey:
      description: API key provided in console
      type: apiKey
      name: api-key
      in: header
    basicHttpAuthentication:
      description: Basic HTTP Authentication
      type: http
      scheme: Basic
    bearerHttpAuthentication:
      description: Bearer token using a JWT
      type: http
      scheme: Bearer
      bearerFormat: JWT
    app2AppOauth:
      type: oauth2
      flows:
        clientCredentials:
          tokenUrl: https://learn.openapis.org/oauth/2.0/token
          scopes:
            # Only reading the board allow with delegated access
            board:read: Read the board
    user2AppOauth:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://learn.openapis.org/oauth/2.0/auth
          tokenUrl: https://learn.openapis.org/oauth/2.0/token
          scopes:
            # Reads and writes permitted via authorization code flow
            board:read: Read the board
            board:write: Write to the board