matrix-spec-proposals/api/client-server/registration.yaml

swagger: '2.0'
info:
  title: "Matrix Client-Server Registration API"
  version: "1.0.0"
host: localhost:8008
schemes:
  - https
  - http
basePath: /_matrix/client/%CLIENT_MAJOR_VERSION%
consumes:
  - application/json
produces:
  - application/json
paths:
  "/register":
    post:
      summary: Register for an account on this homeserver.
      description: |-
        This API endpoint uses the `User-Interactive Authentication API`.

        Register for an account on this homeserver.

        There are two kinds of user account:

        - `user` accounts. These accounts may use the full API described in this specification.

        - `guest` accounts. These accounts may have limited permissions and may not be supported by all servers.

      parameters:
        - in: query
          name: kind
          type: string
          x-example: guest
          required: false
          default: user
          enum:
            - guest
            - user
          description: The kind of account to register. Defaults to `user`.
        - in: body
          name: body
          schema:
            type: object
            properties:
              auth:
                description: |-
                  Additional authentication information for the user-interactive authentication API.
                "$ref": "definitions/auth_data.yaml"
              bind_email:
                type: boolean
                description: |-
                  If true, the server binds the email used for authentication to
                  the Matrix ID with the ID Server.
                example: false
              username:
                type: string
                description: |-
                  The local part of the desired Matrix ID. If omitted,
                  the homeserver MUST generate a Matrix ID local part.
                example: cheeky_monkey
              password:
                type: string
                description: The desired password for the account.
                example: ilovebananas
            required: ["password"]
      responses:
        200:
          description: The account has been registered.
          examples:
            application/json: |-
              {
                "user_id": "@cheeky_monkey:matrix.org",
                "access_token": "abc123",
                "home_server": "matrix.org",
                "refresh_token": "def456"
              }
          schema:
            type: object
            properties:
              user_id:
                type: string
                description: The fully-qualified Matrix ID that has been registered.
              access_token:
                type: string
                description: |-
                  An access token for the account.
                  This access token can then be used to authorize other requests.
                  The access token may expire at some point, and if so, it SHOULD come with a ``refresh_token``.
                  There is no specific error message to indicate that a request has failed because
                  an access token has expired; instead, if a client has reason to believe its
                  access token is valid, and it receives an auth error, they should attempt to
                  refresh for a new token on failure, and retry the request with the new token.
              refresh_token:
                type: string
                # TODO: Work out how to linkify /tokenrefresh
                description: |-
                  (optional) A ``refresh_token`` may be exchanged for a new ``access_token`` using the /tokenrefresh API endpoint.
              home_server:
                type: string
                description: The hostname of the homeserver on which the account has been registered.
        400:
          description: |-
            Part of the request was invalid. This may include one of the following error codes:

            * ``M_USER_IN_USE`` : The desired user ID is already taken.
            * ``M_INVALID_USERNAME`` : The desired user ID is not a valid user name.
            * ``M_EXCLUSIVE`` : The desired user ID is in the exclusive namespace
              claimed by an application service.

            These errors may be returned at any stage of the registration process,
            including after authentication if the requested user ID was registered
            whilst the client was performing authentication.

            Homeservers MUST perform the relevant checks and return these codes before
            performing User-Interactive Authentication, although they may also return
            them after authentication is completed if, for example, the requested user ID
            was registered whilst the client was performing authentication.
          examples:
            application/json: |-
              {
                  "errcode": "M_USER_IN_USE",
                  "error": "Desired user ID is already taken."
              }
        401:
          description: |-
            The homeserver requires additional authentication information.
          schema:
            "$ref": "definitions/auth_response.yaml"
        429:
          description: This request was rate-limited.
          schema:
            "$ref": "definitions/error.yaml"
      tags:
        - User data
  "/register/email/requestToken":
    post:
      summary: Requests a validation token be sent to the given email address for the purpose of registering an account
      description: |-
        .. _register-email-requestToken-endpoint:

        Proxies the identity server API ``validate/email/requestToken``, but
        first checks that the given email address is not already associated
        with an account on this Home Server. Note that, for consistency,
        this API takes JSON objects, though the Identity Server API takes
        ``x-www-form-urlencoded`` parameters. See the Identity Server API for
        further information.
      parameters:
        - in: body
          name: body
          schema:
            type: object
            properties:
              id_server:
                type: string
                description: The ID server to send the onward request to as a hostname with an appended colon and port number if the port is not the default.
                example: "id.matrix.org"
              client_secret:
                type: string
                description: Client-generated secret string used to protect this session
                example: "this_is_my_secret_string"
              email:
                type: string
                description: The email address
                example: "example@example.com"
              send_attempt:
                type: number
                description: Used to distinguish protocol level retries from requests to re-send the email.
                example: "1"
            required: ["client_secret", "email", "send_attempt"]
      responses:
        200:
          description: |-
            An email has been sent to the specified address.
            Note that this may be an email containing the validation token or it may be informing
            the user of an error.
          examples:
            application/json: "{}"
          schema:
            type: object
        400:
          description: |-
            Part of the request was invalid. This may include one of the following error codes:

            * ``M_THREEPID_IN_USE`` : The email address is already registered to an account on this server.
              However, if the home server has the ability to send email, it is recommended that the server
              instead send an email to the user with instructions on how to reset their password.
              This prevents malicious parties from being able to determine if a given email address
              has an account on the Home Server in question.
            * ``M_SERVER_NOT_TRUSTED`` : The ``id_server`` parameter refers to an ID server
              that is not trusted by this Home Server.
          examples:
            application/json: |-
              {
                "errcode": "M_THREEPID_IN_USE",
                "error": "The specified address is already in use"
              }
          schema:
            type: object
  "/account/password":
    post:
      summary: "Changes a user's password."
      description: |-
        Changes the password for an account on this homeserver.

        This API endpoint uses the `User-Interactive Authentication API`_.

        An access token should be submitted to this endpoint if the client has
        an active session.

        The homeserver may change the flows available depending on whether a
        valid access token is provided.
      security:
        - accessToken: []
      parameters:
        - in: body
          name: body
          schema:
            type: object
            properties:
              new_password:
                type: string
                description: The new password for the account.
                example: "ihatebananas"
              auth:
                description: |-
                  Additional authentication information for the user-interactive authentication API.
                "$ref": "definitions/auth_data.yaml"
            required: ["new_password"]
      responses:
        200:
          description: The password has been changed.
          examples:
            application/json: "{}"
          schema:
            type: object
        401:
          description: |-
            The homeserver requires additional authentication information.
          schema:
            "$ref": "definitions/auth_response.yaml"
        429:
          description: This request was rate-limited.
          schema:
            "$ref": "definitions/error.yaml"
      tags:
        - User data
  "/account/password/email/requestToken":
    post:
      summary: Requests a validation token be sent to the given email address for the purpose of resetting a user's password
      description: |-
        Proxies the identity server API ``validate/email/requestToken``, but
        first checks that the given email address **is** associated with an account
        on this Home Server. This API should be used to request
        validation tokens when authenticating for the
        `account/password` endpoint. This API's parameters and response are
        identical to that of `/register/email/requestToken` except that
        `M_THREEPID_NOT_FOUND` may be returned if no account matching the
        given email address could be found. The server may instead send an
        email to the given address prompting the user to create an account.
        `M_THREEPID_IN_USE` may not be returned.
      responses:
        200:
          description: An email was sent to the given address