openapi: 3.0.3
info:
  title: Stream Chat API (Server-side REST) Application Messages API
  description: 'Server-side REST API for Stream (GetStream.io) Chat. This is a curated subset of Stream''s published Chat protocol (https://getstream.github.io/protocol), grounding the endpoints modeled in the API Evangelist catalog against the real base URL and paths. The Chat API is addressed at https://chat.stream-io-api.com. Every request carries the application `api_key` as a query parameter and is authenticated with a JWT sent in the `Authorization` header together with a `Stream-Auth-Type: jwt` header. Server-side tokens (no `user_id` claim) are used for the operations in this document; client tokens are used to open the real-time WebSocket connection modeled in the companion AsyncAPI document.

    Path and method choices here are taken from Stream''s official chat-openapi.yaml (github.com/GetStream/protocol). Request and response bodies are represented generically; consult the linked protocol reference for the full schemas.'
  version: '1.0'
  contact:
    name: API Evangelist
    url: https://apievangelist.com
    email: kin@apievangelist.com
  license:
    name: API documentation - Stream Terms
    url: https://getstream.io/legal/terms/
servers:
- url: https://chat.stream-io-api.com
  description: Stream Chat API (edge, global)
security:
- JWT: []
  ApiKey: []
tags:
- name: Messages
  description: Send, retrieve, update, delete, and search messages and replies.
paths:
  /channels/{type}/{id}/message:
    parameters:
    - $ref: '#/components/parameters/ChannelType'
    - $ref: '#/components/parameters/ChannelId'
    post:
      operationId: SendMessage
      tags:
      - Messages
      summary: Send a message
      description: Send a new message to a channel. Emits a `message.new` event over the WebSocket to watchers of the channel.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SendMessageRequest'
      responses:
        '201':
          $ref: '#/components/responses/Message'
        '400':
          $ref: '#/components/responses/BadRequest'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /messages/{id}:
    parameters:
    - $ref: '#/components/parameters/MessageId'
    get:
      operationId: GetMessage
      tags:
      - Messages
      summary: Get a message
      responses:
        '200':
          $ref: '#/components/responses/Message'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: UpdateMessage
      tags:
      - Messages
      summary: Update a message (overwrite)
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '200':
          $ref: '#/components/responses/Message'
    put:
      operationId: UpdateMessagePartial
      tags:
      - Messages
      summary: Partially update a message
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                set:
                  type: object
                unset:
                  type: array
                  items:
                    type: string
      responses:
        '200':
          $ref: '#/components/responses/Message'
    delete:
      operationId: DeleteMessage
      tags:
      - Messages
      summary: Delete a message
      parameters:
      - name: hard
        in: query
        schema:
          type: boolean
      responses:
        '200':
          $ref: '#/components/responses/Message'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /messages/{parent_id}/replies:
    parameters:
    - name: parent_id
      in: path
      required: true
      description: The id of the parent message whose thread replies to fetch.
      schema:
        type: string
    get:
      operationId: GetReplies
      tags:
      - Messages
      summary: Get thread replies
      description: Paginate the replies under a parent (thread) message.
      responses:
        '200':
          description: A list of reply messages.
          content:
            application/json:
              schema:
                type: object
                properties:
                  messages:
                    type: array
                    items:
                      $ref: '#/components/schemas/Message'
components:
  parameters:
    ChannelId:
      name: id
      in: path
      required: true
      description: The channel id, unique within the channel type.
      schema:
        type: string
    MessageId:
      name: id
      in: path
      required: true
      description: The unique id of the message.
      schema:
        type: string
    ChannelType:
      name: type
      in: path
      required: true
      description: The channel type, e.g. messaging, livestream, team, gaming, commerce.
      schema:
        type: string
  responses:
    Message:
      description: A message wrapped in a response envelope.
      content:
        application/json:
          schema:
            type: object
            properties:
              message:
                $ref: '#/components/schemas/Message'
              duration:
                type: string
    BadRequest:
      description: The request was malformed.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/APIError'
    NotFound:
      description: The requested resource does not exist.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/APIError'
    TooManyRequests:
      description: Rate limit exceeded for this app, platform, and endpoint. Inspect the X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset headers.
      headers:
        X-RateLimit-Limit:
          schema:
            type: integer
        X-RateLimit-Remaining:
          schema:
            type: integer
        X-RateLimit-Reset:
          schema:
            type: integer
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/APIError'
  schemas:
    User:
      type: object
      properties:
        id:
          type: string
        role:
          type: string
        name:
          type: string
        image:
          type: string
        online:
          type: boolean
        last_active:
          type: string
          format: date-time
        created_at:
          type: string
          format: date-time
    SendMessageRequest:
      type: object
      required:
      - message
      properties:
        message:
          type: object
          properties:
            text:
              type: string
            attachments:
              type: array
              items:
                type: object
            mentioned_users:
              type: array
              items:
                type: string
            parent_id:
              type: string
              description: If set, the message is a reply in the given thread.
    APIError:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
        StatusCode:
          type: integer
        duration:
          type: string
        more_info:
          type: string
    Message:
      type: object
      properties:
        id:
          type: string
        text:
          type: string
        type:
          type: string
          description: regular, ephemeral, error, reply, system, or deleted.
        cid:
          type: string
        user:
          $ref: '#/components/schemas/User'
        parent_id:
          type: string
        reaction_counts:
          type: object
          additionalProperties:
            type: integer
        created_at:
          type: string
          format: date-time
        updated_at:
          type: string
          format: date-time
  securitySchemes:
    JWT:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: 'A Stream JWT sent in the `Authorization` header. Server-side tokens omit the `user_id` claim; a `Stream-Auth-Type: jwt` header must accompany the request.'
    ApiKey:
      type: apiKey
      in: query
      name: api_key
      description: The application API key, sent as the `api_key` query parameter on every request.