# All files / src/auth sessionData.ts

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    import { GaiaHubConfig } from '../storage/hub'
    import { InvalidStateError } from '../errors'
    import { UserData } from './authApp'

    const SESSION_VERSION = '1.0.0'

    export interface SessionOptions {
      coreNode?: string,
      userData?: UserData,
      transitKey?: string,
      localStorageKey?: string,
      storeOptions?: {
        localStorageKey?: string
      }
    }

    /**
     * @ignore
     */
    export class SessionData {
      version: string

      transitKey?: string

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

      constructor(options: SessionOptions) {
        this.version = SESSION_VERSION
        this.userData = options.userData
        this.transitKey = options.transitKey
      }

      getGaiaHubConfig(): GaiaHubConfig {
        return this.userData && this.userData.gaiaHubConfig
      }

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

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

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