openapi: 3.1.0
info:
  title: Jupyter Notebook Jupyter Kernel Gateway Authorization Sessions API
  description: 'REST API for the Jupyter Kernel Gateway, a web server that provides headless access to Jupyter kernels. The Kernel Gateway supports two modes: jupyter-websocket mode (default) which provides a Jupyter Notebook server-compatible API for kernel management, and notebook-http mode which maps notebook cells to HTTP endpoints. This spec covers the jupyter-websocket mode API.'
  version: 3.0.0
  license:
    name: BSD-3-Clause
    url: https://opensource.org/licenses/BSD-3-Clause
  contact:
    name: Jupyter Project
    url: https://jupyter-kernel-gateway.readthedocs.io
    email: jupyter@googlegroups.com
servers:
- url: http://localhost:8888/api
  description: Local Jupyter Kernel Gateway server
security:
- token: []
- tokenQuery: []
tags:
- name: Sessions
  description: Session management for associating notebooks with running kernels.
paths:
  /api/sessions:
    get:
      operationId: listSessions
      summary: Jupyter Notebook List running sessions
      description: List all currently running notebook sessions.
      tags:
      - Sessions
      responses:
        '200':
          description: List of active sessions.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Session'
    post:
      operationId: createSession
      summary: Jupyter Notebook Create a new session
      description: Create a new session by starting a kernel and associating it with a notebook path.
      tags:
      - Sessions
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SessionCreate'
      responses:
        '201':
          description: Session created successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Session'
        '501':
          description: Kernel not available.
  /api/sessions/{session_id}:
    get:
      operationId: getSession
      summary: Jupyter Notebook Get a session
      description: Get the details of a specific session by its ID.
      tags:
      - Sessions
      parameters:
      - name: session_id
        in: path
        required: true
        description: Unique identifier for the session.
        schema:
          type: string
          format: uuid
      responses:
        '200':
          description: Session details.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Session'
        '404':
          description: Session not found.
    patch:
      operationId: updateSession
      summary: Jupyter Notebook Update a session
      description: Update a session, for example to change the associated kernel or notebook path.
      tags:
      - Sessions
      parameters:
      - name: session_id
        in: path
        required: true
        description: Unique identifier for the session.
        schema:
          type: string
          format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SessionUpdate'
      responses:
        '200':
          description: Session updated successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Session'
        '400':
          description: Bad request.
        '404':
          description: Session not found.
    delete:
      operationId: deleteSession
      summary: Jupyter Notebook Delete a session
      description: Delete a session and shut down its associated kernel.
      tags:
      - Sessions
      parameters:
      - name: session_id
        in: path
        required: true
        description: Unique identifier for the session.
        schema:
          type: string
          format: uuid
      responses:
        '204':
          description: Session deleted successfully.
        '404':
          description: Session not found.
components:
  schemas:
    SessionUpdate:
      type: object
      description: Request body for updating a session.
      properties:
        path:
          type: string
          description: New notebook path for the session.
        name:
          type: string
          description: New name for the session.
        type:
          type: string
          description: New type for the session.
        kernel:
          type: object
          description: Kernel specification update.
          properties:
            id:
              type: string
              format: uuid
              description: ID of a kernel to associate with.
            name:
              type: string
              description: Name of the kernel spec.
    SessionCreate:
      type: object
      description: Request body for creating a new session.
      properties:
        path:
          type: string
          description: Path to the notebook.
        name:
          type: string
          description: Name for the session.
        type:
          type: string
          description: Type of the session.
        kernel:
          type: object
          description: Kernel specification for the session.
          properties:
            id:
              type: string
              format: uuid
              description: ID of an existing kernel to connect to.
            name:
              type: string
              description: Name of the kernel spec to start.
      required:
      - path
      - type
      - kernel
    Kernel:
      type: object
      description: A running kernel instance.
      properties:
        id:
          type: string
          format: uuid
          description: Unique identifier for the kernel.
        name:
          type: string
          description: Name of the kernel specification.
        last_activity:
          type: string
          format: date-time
          description: Timestamp of the last activity on the kernel.
        execution_state:
          type: string
          description: Current execution state of the kernel.
          enum:
          - starting
          - idle
          - busy
          - restarting
          - dead
        connections:
          type: integer
          description: Number of active connections to this kernel.
      required:
      - id
      - name
      - last_activity
      - execution_state
      - connections
    Session:
      type: object
      description: A notebook session, associating a notebook with a kernel.
      properties:
        id:
          type: string
          format: uuid
          description: Unique identifier for the session.
        path:
          type: string
          description: Path to the notebook or file associated with the session.
        name:
          type: string
          description: Name of the notebook or activity.
        type:
          type: string
          description: Type of the session (e.g., 'notebook', 'console').
        kernel:
          $ref: '#/components/schemas/Kernel'
      required:
      - id
      - path
      - name
      - type
      - kernel
  securitySchemes:
    token:
      type: apiKey
      in: header
      name: Authorization
      description: Authentication token configured via KG_AUTH_TOKEN. Passed as 'token <token_value>' in the Authorization header.
    tokenQuery:
      type: apiKey
      in: query
      name: token
      description: Authentication token passed as a query parameter.