# All files / src auth.js

52.46% Statements 32/61
40.63% Branches 13/32
73.68% Functions 14/19
52.46% Lines 32/61

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     import queryParse from './util/query-parse'
    import { Observable } from 'rxjs/Observable'
    import 'rxjs/add/operator/do'
    import 'rxjs/add/operator/map'
    import 'rxjs/add/observable/dom/ajax'

    const HORIZON_JWT = 'horizon-jwt'

    /** @this Horizon **/
    export function authEndpoint(name) {
      const endpointForName = methods => {
        if (methods.hasOwnProperty(name)) {
          return this._root + methods[name]
        } else {
          throw new Error(`Unconfigured auth type: ${name}`)
        }
      }
      if (!this._authMethods) {
        return Observable.ajax(`${this._horizonPath}/auth_methods`)
          .map(ajax => ajax.response)
          .do(authMethods => {
            this._authMethods = authMethods
          }).map(endpointForName)
      } else {
        return Observable.of(this._authMethods).map(endpointForName)
      }
    }

    // Simple shim to make a Map look like local/session storage
    export class FakeStorage {
      constructor() { this._storage = new Map() }
      setItem(a, b) { return this._storage.set(a, b) }
      getItem(a) { return this._storage.get(a) }
      removeItem(a) { return this._storage.delete(a) }
    }

    function getStorage(storeLocally = true) {
      let storage
      try {
        Eif (!storeLocally ||
            typeof window !== 'object' ||
            window.localStorage === undefined) {
          storage = new FakeStorage()
        } else {
          // Mobile safari in private browsing has a localStorage, but it
          // has a size limit of 0
          window.localStorage.setItem('$$fake', 1)
          window.localStorage.removeItem('$$fake')
          storage = window.localStorage
        }
      } catch (error) {
        if (window.sessionStorage === undefined) {
          storage = new FakeStorage()
        } else {
          storage = window.sessionStorage
        }
      }
      return storage
    }

    export class TokenStorage {
      constructor({ authType = 'token',
                    storage = getStorage(authType.storeLocally),
                    path = 'horizon' } = {}) {
        this._storage = storage
        this._path = path
        Eif (typeof authType === 'string') {
          this._authType = authType
        } else {
          this._authType = 'token'
          this.set(authType.token)
        }
      }

      _getHash() {
        const val = this._storage.getItem(HORIZON_JWT)
        if (val == null) {
          return {}
        } else {
          return JSON.parse(val)
        }
      }

      _setHash(hash) {
        this._storage.setItem(HORIZON_JWT, JSON.stringify(hash))
      }

      set(jwt) {
        const current = this._getHash()
        current[this._path] = jwt
        this._setHash(current)
      }

      get() {
        return this._getHash()[this._path]
      }

      remove() {
        const current = this._getHash()
        delete current[this._path]
        this._setHash(current)
      }

      setAuthFromQueryParams() {
        const parsed = typeof window !== 'undefined' &&
          typeof window.location !== 'undefined' ?
                queryParse(window.location.search) : {}

        Iif (parsed.horizon_token != null) {
          this.set(parsed.horizon_token)
        }
      }

      // Handshake types are implemented here
      handshake() {
        // If we have a token, we should send it rather than requesting a
        // new one
        const token = this.get()
        Iif (token != null) {
          return { method: 'token', token }
        } else Iif (this._authType === 'token') {
          throw new Error(
            'Attempting to authenticate with a token, but no token is present')
        } else {
          return { method: this._authType }
        }
      }

      // Whether there is an auth token for the provided authType
      hasAuthToken() {
        const token = this.get()
        if (!token) {
          return false
        }
        try {
          const meta = JSON.parse(atob(token.split('.')[1]))
          const exp = meta.exp
          const now = new Date().getTime() / 1000
          return (now < exp)
        } catch (e) {
          return false
        }
      }
    }

    export function clearAuthTokens() {
      return getStorage().removeItem(HORIZON_JWT)
    }