# All files / src/auth sessionData.js

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     /* @flow */
    import type { GaiaHubConfig } from '../storage/hub'
    import { InvalidStateError } from '../errors'

    const SESSION_VERSION = '1.0.0'

    export type SessionOptions = {
      appPrivateKey?: string,
      username?: string,
      identityAddress?: string,
      coreNode?: string,
      hubUrl?: string,
      storeOptions?: {},
      userData?: any,
      transitKey?: string,
      localStorageKey?: string,
      storeOptions?: {
        localStorageKey?: string
      }
    }

    export class SessionData {
      version: string

      appPrivateKey: ?string // required after sign in

      identityAddress: ?string // required after sign in

      username: ?string

      coreNode: ?string

      hubUrl: ?string // required after sign in

      transitKey: ?string

      // using this in place of
      // window.localStorage.setItem(BLOCKSTACK_STORAGE_LABEL, JSON.stringify(userData))
      userData: ?any

      gaiaHubConfig: ?GaiaHubConfig

      constructor(options: SessionOptions) {
        this.version = SESSION_VERSION
        this.appPrivateKey = options.appPrivateKey
        this.identityAddress = options.identityAddress
        this.username = options.username
        this.coreNode = options.coreNode
        this.hubUrl = options.hubUrl
        this.userData = options.userData
        this.transitKey = options.transitKey

        // initializing Gaia connection requires a network request
        // so we'll defer it until the first time it's needed
        this.gaiaHubConfig = null
      }

      getGaiaHubConfig() : ?GaiaHubConfig {
        return this.gaiaHubConfig
      }

      setGaiaHubConfig(config: GaiaHubConfig) : void {
        this.gaiaHubConfig = config
      }

      static fromJSON(json: Object) : SessionData {
        if (json.version !== SESSION_VERSION) {
          throw new InvalidStateError(`JSON data version ${json.version} not supported by SessionData`)
        }
        const options: SessionOptions = {
          appPrivateKey: json.appPrivateKey,
          identityAddress: json.identityAddress,
          username: json.username,
          coreNode: json.coreNode,
          hubUrl: json.hubUrl,
          userData: json.userData,
          transitKey: json.transitKey
        }
        return new SessionData(options)
      }

      toString(): string {
        return JSON.stringify(this)
      }
    }