openapi: 3.1.0
info:
  title: Google Pub/Sub Google Cloud Pub/Sub Publish API
  description: Provides reliable, many-to-many, asynchronous messaging between applications. The Pub/Sub API allows you to create and manage topics and subscriptions, publish messages, and pull or push messages to subscribers.
  version: v1
  contact:
    name: Google Cloud
    url: https://cloud.google.com/pubsub
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: https://pubsub.googleapis.com
  description: Google Cloud Pub/Sub API
security:
- oauth2:
  - https://www.googleapis.com/auth/pubsub
- bearerAuth: []
tags:
- name: Publish
  description: Publish messages to topics
paths:
  /v1/{topic}:publish:
    post:
      operationId: publish
      summary: Google Pub/Sub Publish messages
      description: Adds one or more messages to the topic. Returns NOT_FOUND if the topic does not exist.
      tags:
      - Publish
      parameters:
      - name: topic
        in: path
        required: true
        description: The topic name (e.g., projects/my-project/topics/my-topic).
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PublishRequest'
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PublishResponse'
components:
  schemas:
    PublishRequest:
      type: object
      required:
      - messages
      properties:
        messages:
          type: array
          items:
            $ref: '#/components/schemas/PubsubMessage'
    PublishResponse:
      type: object
      properties:
        messageIds:
          type: array
          items:
            type: string
    PubsubMessage:
      type: object
      properties:
        data:
          type: string
          format: byte
          description: The message data (base64-encoded).
        attributes:
          type: object
          additionalProperties:
            type: string
        messageId:
          type: string
        publishTime:
          type: string
          format: date-time
        orderingKey:
          type: string
  securitySchemes:
    oauth2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://accounts.google.com/o/oauth2/auth
          tokenUrl: https://oauth2.googleapis.com/token
          scopes:
            https://www.googleapis.com/auth/pubsub: Manage Pub/Sub resources
            https://www.googleapis.com/auth/cloud-platform: Full access to Google Cloud
    bearerAuth:
      type: http
      scheme: bearer