Keenchat API

The new Keenchat REST API has channels, and an authenticated post mechanism. There is also a companion Websockets server than runs concurrently.

Installation

1. Set the PORT and WEBSOCKETS_PORT environment variables (defaults are 5000 and 5001).
2. Run node server.js

REST API

The REST API consists of the following endpoints:

• POST /auth - {username : String, password : String} to {token_value : String}. This endpoint is used to log in to the system - sending valid credentials will cause the server to respond with an authentication token which can be used to verify future API calls. Not really RESTful.

• GET|POST /user[/:id]. A standard REST endpoint for users. The resource is of the form {id : Integer, username : String, password : String}, however the password is always omitted when the resource is sent from the server. Sending a POST request will cause a new user to be created; to send messages as that user an authentication token must be generated.

• GET|POST|PUT|DELETE /channel[/:id]. Standard REST, with the resource {id : Integer, title : String, description : String}. Authentication required to create new channels. POST/PUT/DELETE not quite ready yet.

• GET|POST /message[:/id]. Standard REST, with resource {id : Integer, channel_id : Integer, user_id : Integer, message_text : String, time : Integer}. The channel_id and user_id are foreign keys to the user and channel resources. Messages from specified channels and users can be fetched by including them as query string parameters, e.g. channel_id=1. In order to POST messages, an auth query string parameter must be included, of the form auth=<auth_token>.

Websockets API

In order to support real-time communication, the server also runs a web sockets API in conjunction with the main HTTP server. The websockets server supports bi-directional data transfer, and passes entire resources along with it. Use of the websockets API is necessary in order to support real-time functionality, including new message detection and channel user lists.

Events the server sends

• post user. Indicates a new user has been created, and contains a user resource (the new user).
• post message. Indicates a new message has been created, containing the message resource.
• channel movement. Indicates that the online user composition of a channel has changed. Contains {channel_id : Integer, users : [Integer]}, where channel_id is the relevant channel, and users is the new list of user_ids of the users currently in the channel.
• (start|stop) typing. Indicates that a user has started/stopped typing in a channel. Sends {user_id : Integer, channel_id : Integer}.
• refresh page. Indicates that the web client has an update, and the page should refresh. Not really used.

Events to send to the server

• connection. Indicates the client has connected. No data. Many websocket libraries will send this automatically.

(TBC...)