openapi: 3.0.1
info:
  title: Mainflux twins service
  description: HTTP API for managing digital twins and their states.
  version: '1.0.0'

paths:
  /twins:
    post:
      summary: Adds new twin
      description: |
        Adds new twin to the list of twins owned by user identified using
        the provided access token.
      tags:
        - twins
      parameters:
        - $ref: '#/components/parameters/Authorization'
      requestBody:
        $ref: "#/components/requestBodies/TwinReq"
      responses:
        '201':
          $ref: "#/components/responses/TwinCreateRes"
        '400':
          description: Failed due to malformed JSON.
        '403':
          description: Missing or invalid access token provided.
        '415':
          description: Missing or invalid content type.
        '500':
          $ref: '#/components/responses/ServiceError'

    get:
      summary: Retrieves twins
      description: |
        Retrieves a list of twins. Due to performance concerns, data
        is retrieved in subsets.
      tags:
        - twins
      parameters:
        - $ref: '#/components/parameters/Authorization'
        - $ref: '#/components/parameters/Limit'
        - $ref: '#/components/parameters/Offset'
        - $ref: '#/components/parameters/Name'
        - $ref: '#/components/parameters/Metadata'
      responses:
        '200':
          $ref: '#/components/responses/TwinsPageRes'
        '400':
          description: Failed due to malformed query parameters.
        '403':
          description: Missing or invalid access token provided.
        '500':
          $ref: '#/components/responses/ServiceError'

  /twins/{twinID}:
    get:
      summary: Retrieves twin info
      tags:
        - twins
      parameters:
        - $ref: '#/components/parameters/Authorization'
        - $ref: '#/components/parameters/TwinID'
      responses:
        '200':
          $ref: '#/components/responses/TwinRes'
        '400':
          description: Failed due to malformed twin's ID.
        '403':
          description: Missing or invalid access token provided.
        '404':
          description: Twin does not exist.
        '500':
          $ref: '#/components/responses/ServiceError'
    put:
      summary: Updates twin info
      description: |
        Update is performed by replacing the current resource data with values
        provided in a request payload. Note that the twin's ID cannot be changed.
      tags:
        - twins
      parameters:
        - $ref: '#/components/parameters/Authorization'
        - $ref: '#/components/parameters/TwinID'
      requestBody:
        $ref: '#/components/requestBodies/TwinReq'
      responses:
        '200':
          description: Twin updated.
        '400':
          description: Failed due to malformed twin's ID or malformed JSON.
        '403':
          description: Missing or invalid access token provided.
        '404':
          description: Twin does not exist.
        '415':
          description: Missing or invalid content type.
        '500':
          $ref: '#/components/responses/ServiceError'
    delete:
      summary: Removes a twin
      description: Removes a twin.
      tags:
        - twins
      parameters:
        - $ref: '#/components/parameters/Authorization'
        - $ref: '#/components/parameters/TwinID'
      responses:
        '204':
          description: Twin removed.
        '400':
          description: Failed due to malformed twin's ID.
        '403':
          description: Missing or invalid access token provided
        '404':
          description: Twin does not exist.
        '500':
          $ref: '#/components/responses/ServiceError'

  /states/{twinID}:
    get:
      summary: Retrieves states of twin with id twinID
      description: |
        Retrieves a list of states. Due to performance concerns, data
        is retrieved in subsets.
      tags:
        - states
      parameters:
        - $ref: '#/components/parameters/TwinID'
        - $ref: '#/components/parameters/Authorization'
        - $ref: '#/components/parameters/Limit'
        - $ref: '#/components/parameters/Offset'
      responses:
        '200':
          $ref: '#/components/responses/StatesPageRes'
        '400':
          description: Failed due to malformed query parameters.
        '403':
          description: Missing or invalid access token provided.
        '404':
          description: Twin does not exist.
        '500':
          $ref: '#/components/responses/ServiceError'

components:
  parameters:
    Authorization:
      name: Authorization
      description: User's access token.
      in: header
      schema:
        type: string
        format: uuid
      required: true
    Limit:
      name: limit
      description: Size of the subset to retrieve.
      in: query
      schema:
        type: integer
        default: 10
        maximum: 100
        minimum: 1
      required: false
    Offset:
      name: offset
      description: Number of items to skip during retrieval.
      in: query
      schema:
        type: integer
        default: 0
        minimum: 0
      required: false
    Name:
      name: name
      description: Twin name
      in: query
      schema:
        type: string
      required: false
    Metadata:
      name: metadata
      description: |
        Metadata filter. Filtering is performed matching the parameter with
        metadata on top level. Parameter is json.
      in: query
      schema:
        type: string
        minimum: 0
      required: false
    TwinID:
      name: twinID
      description: Unique twin identifier.
      in: path
      schema:
        type: string
        format: uuid
        minimum: 1
      required: true

  schemas:
    Attribute:
      type: object
      properties:
        name:
          type: string
          description: Name of the attribute.
        channel:
          type: string
          description: Mainflux channel used by attribute.
        subtopic:
          type: string
          description: Subtopic used by attribute.
        persist_state:
          type: boolean
          description: Trigger state creation based on the attribute.
    Definition:
      type: object
      properties:
        delta:
          type: number
          description: Minimal time delay before new state creation.
        attributes:
          type: array
          minItems: 0
          uniqueItems: true
          items:
            $ref: '#/components/schemas/Attribute'
    TwinReqObj:
      type: object
      properties:
        name:
          type: string
          description: Free-form twin name.
        metadata:
          type: object
          description: Arbitrary, object-encoded twin's data.
        definition:
          $ref: '#/components/schemas/Definition'
    TwinResObj:
      type: object
      properties:
        owner:
          type: string
          description: Email address of Mainflux user that owns twin.
        id:
          type: string
          description: Unique twin identifier generated by the service.
        name:
          type: string
          description: Free-form twin name.
        revision:
          type: number
          description: Oridnal revision number of twin.
        created:
          type: string
          format: date
          description: Twin creation date and time.
        updated:
          type: string
          format: date
          description: Twin update date and time.
        definitions:
          type: array
          minItems: 0
          uniqueItems: true
          items:
            $ref: '#/components/schemas/Definition'
        metadata:
          type: object
          description: Arbitrary, object-encoded twin's data.
    TwinsPage:
      type: object
      properties:
        twins:
          type: array
          minItems: 0
          uniqueItems: true
          items:
            $ref: '#/components/schemas/TwinResObj'
        total:
          type: integer
          description: Total number of items.
        offset:
          type: integer
          description: Number of items to skip during retrieval.
        limit:
          type: integer
          description: Maximum number of items to return in one page.
      required:
        - twins
    State:
      type: object
      properties:
        twin_id:
          type: string
          description: ID of twin state belongs to.
          format: uuid
        id:
          type: number
          description: State position in a time row of states.
        created:
          type: string
          format: date
          description: State creation date.
        payload:
          type: object
          description: Object-encoded states's payload.
    StatesPage:
      type: object
      properties:
        twins:
          type: array
          minItems: 0
          uniqueItems: true
          items:
            $ref: '#/components/schemas/State'
        total:
          type: integer
          description: Total number of items.
        offset:
          type: integer
          description: Number of items to skip during retrieval.
        limit:
          type: integer
          description: Maximum number of items to return in one page.
      required:
        - twins

  requestBodies:
    TwinReq:
      description: JSON-formatted document describing the twin to create or update.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/TwinReqObj'
      required: true

  responses:
    TwinCreateRes:
      description: Created twin's relative URL (i.e. /twins/{twinID}).
      headers:
        Location:
          content:
            text/plain:
              schema:
                type: string
    TwinRes:
      description: Data retrieved.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/TwinResObj'
    TwinsPageRes:
      description: Data retrieved.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/TwinsPage'
    StatesPageRes:
      description: Data retrieved.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/StatesPage'
    ServiceError:
      description: Unexpected server-side error occurred.