# All files / src index.js

91.49% Statements 43/47
72.41% Branches 21/29
92.86% Functions 13/14
91.49% Lines 43/47

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     import 'rxjs/add/observable/of'
    import 'rxjs/add/observable/from'
    import 'rxjs/add/operator/catch'
    import 'rxjs/add/operator/concatMap'
    import 'rxjs/add/operator/map'
    import 'rxjs/add/operator/filter'

    import { Collection, UserDataTerm } from './ast'
    import { HorizonSocket } from './socket'
    import { authEndpoint, TokenStorage, clearAuthTokens } from './auth'
    import { aggregate, model } from './model'

    const defaultHost = typeof window !== 'undefined' && window.location &&
            `${window.location.host}` || 'localhost:8181'
    const defaultSecure = typeof window !== 'undefined' && window.location &&
            window.location.protocol === 'https:' || false

    function Horizon({
      host = defaultHost,
      secure = defaultSecure,
      path = 'horizon',
      lazyWrites = false,
      authType = 'unauthenticated',
      keepalive = 60,
      WebSocketCtor = WebSocket,
    } = {}) {
      // If we're in a redirection from OAuth, store the auth token for
      // this user in localStorage.

      const tokenStorage = new TokenStorage({ authType, path })
      tokenStorage.setAuthFromQueryParams()

      const url = `ws${secure ? 's' : ''}:\/\/${host}\/${path}`
      const socket = new HorizonSocket({
        url,
        handshakeMaker: tokenStorage.handshake.bind(tokenStorage),
        keepalive,
        WebSocketCtor,
      })

      // Store whatever token we get back from the server when we get a
      // handshake response
      socket.handshake.subscribe({
        next(handshake) {
          if (authType !== 'unauthenticated') {
            tokenStorage.set(handshake.token)
          }
        },
        error(err) {
          if (/JsonWebTokenError|TokenExpiredError/.test(err.message)) {
            console.error('Horizon: clearing token storage since auth failed')
            tokenStorage.remove()
          }
        },
      })

      // This is the object returned by the Horizon function. It's a
      // function so we can construct a collection simply by calling it
      // like horizon('my_collection')
      function horizon(name) {
        return new Collection(sendRequest, name, lazyWrites)
      }

      horizon.currentUser = () =>
        new UserDataTerm(horizon, socket.handshake, socket)

      horizon.disconnect = () => {
        socket.complete()
      }

      // Dummy subscription to force it to connect to the
      // server. Optionally provide an error handling function if the
      // socket experiences an error.
      // Note: Users of the Observable interface shouldn't need this
      horizon.connect = (
        onError = err => { console.error(`Received an error: ${err}`) }
      ) => {
        socket.subscribe(
          () => {},
          onError
        )
      }

      // Either subscribe to status updates, or return an observable with
      // the current status and all subsequent status changes.
      horizon.status = subscribeOrObservable(socket.status)

      // Convenience method for finding out when disconnected
      horizon.onDisconnected = subscribeOrObservable(
        socket.status.filter(x => x.type === 'disconnected'))

      // Convenience method for finding out when ready
      horizon.onReady = subscribeOrObservable(
        socket.status.filter(x => x.type === 'ready'))

      // Convenience method for finding out when an error occurs
      horizon.onSocketError = subscribeOrObservable(
        socket.status.filter(x => x.type === 'error'))

      horizon.utensils = {
        sendRequest,
        tokenStorage,
        handshake: socket.handshake,
      }
      Object.freeze(horizon.utensils)

      horizon._authMethods = null
      horizon._root = `http${(secure) ? 's' : ''}://${host}`
      horizon._horizonPath = `${horizon._root}/${path}`
      horizon.authEndpoint = authEndpoint
      horizon.hasAuthToken = tokenStorage.hasAuthToken.bind(tokenStorage)
      horizon.aggregate = aggregate
      horizon.model = model

      return horizon

      // Sends a horizon protocol request to the server, and pulls the data
      // portion of the response out.
      function sendRequest(type, options) {
        // Both remove and removeAll use the type 'remove' in the protocol
        const normalizedType = type === 'removeAll' ? 'remove' : type
        return socket
          .hzRequest({ type: normalizedType, options }) // send the raw request
          .takeWhile(resp => resp.state !== 'complete')
      }
    }

    function subscribeOrObservable(observable) {
      return (...args) => {
        if (args.length > 0) {
          return observable.subscribe(...args)
        } else {
          return observable
        }
      }
    }

    Horizon.Socket = HorizonSocket
    Horizon.clearAuthTokens = clearAuthTokens

    module.exports = Horizon