# All files / src/storage hub.js

62.3% Statements 38/61
39.13% Branches 9/23
82.35% Functions 14/17
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     /* @flow */
    import bitcoin from 'bitcoinjs-lib'
    import crypto from 'crypto'

    import { TokenSigner } from 'jsontokens'
    import { ecPairToAddress } from '../utils'
    import { getPublicKeyFromPrivate, hexStringToECPair } from '../index'
    import { BLOCKSTACK_DEFAULT_GAIA_HUB_URL } from '../auth/authConstants'

    import { UserSession } from '../auth/userSession'
    import { Logger } from '../logger'
    import { InvalidStateError } from '../errors'

    export const BLOCKSTACK_GAIA_HUB_LABEL = 'blockstack-gaia-hub-config'

    export type GaiaHubConfig = {
      address: string,
      url_prefix: string,
      token: string,
      server: string
    }

    export function uploadToGaiaHub(filename: string, contents: any,
                                    hubConfig: GaiaHubConfig,
                                    contentType: string = 'application/octet-stream'): Promise<*> {
      Logger.debug(`uploadToGaiaHub: uploading ${filename} to ${hubConfig.server}`)
      return fetch(`${hubConfig.server}/store/${hubConfig.address}/${filename}`,
                   {
                     method: 'POST',
                     headers: {
                       'Content-Type': contentType,
                       Authorization: `bearer ${hubConfig.token}`
                     },
                     body: contents
                   })
        .then((response) => {
          if (response.ok) {
            return response.text()
          } else {
            throw new Error('Error when uploading to Gaia hub')
          }
        })
        .then(responseText => JSON.parse(responseText))
        .then(responseJSON => responseJSON.publicURL)
    }

    export function getFullReadUrl(filename: string,
                                   hubConfig: GaiaHubConfig): string {
      return `${hubConfig.url_prefix}${hubConfig.address}/${filename}`
    }

    function makeLegacyAuthToken(challengeText: string, signerKeyHex: string): string {
      // only sign specific legacy auth challenges.
      let parsedChallenge
      try {
        parsedChallenge = JSON.parse(challengeText)
      } catch (err) {
        throw new Error('Failed in parsing legacy challenge text from the gaia hub.')
      }
      if (parsedChallenge[0] === 'gaiahub'
          && parsedChallenge[3] === 'blockstack_storage_please_sign') {
        const signer = hexStringToECPair(signerKeyHex
                                         + (signerKeyHex.length === 64 ? '01' : ''))
        const digest = bitcoin.crypto.sha256(challengeText)
        const signature = signer.sign(digest).toDER().toString('hex')
        const publickey = getPublicKeyFromPrivate(signerKeyHex)
        const token = Buffer.from(JSON.stringify(
          { publickey, signature }
        )).toString('base64')
        return token
      } else {
        throw new Error('Failed to connect to legacy gaia hub. If you operate this hub, please update.')
      }
    }

    function makeV1GaiaAuthToken(hubInfo: Object,
                                 signerKeyHex: string,
                                 hubUrl: string,
                                 associationToken?: string): string {
      const challengeText = hubInfo.challenge_text
      const handlesV1Auth = (hubInfo.latest_auth_version
                             && parseInt(hubInfo.latest_auth_version.slice(1), 10) >= 1)
      const iss = getPublicKeyFromPrivate(signerKeyHex)

      Iif (!handlesV1Auth) {
        return makeLegacyAuthToken(challengeText, signerKeyHex)
      }

      const salt = crypto.randomBytes(16).toString('hex')
      const payload = {
        gaiaChallenge: challengeText,
        hubUrl,
        iss,
        salt,
        associationToken
      }
      const token = new TokenSigner('ES256K', signerKeyHex).sign(payload)
      return `v1:${token}`
    }

    export function connectToGaiaHub(gaiaHubUrl: string,
                                     challengeSignerHex: string,
                                     associationToken?: string): Promise<GaiaHubConfig> {
      Logger.debug(`connectToGaiaHub: ${gaiaHubUrl}/hub_info`)

      return fetch(`${gaiaHubUrl}/hub_info`)
        .then(response => response.json())
        .then((hubInfo) => {
          const readURL = hubInfo.read_url_prefix
          const token = makeV1GaiaAuthToken(hubInfo, challengeSignerHex, gaiaHubUrl, associationToken)
          const address = ecPairToAddress(hexStringToECPair(challengeSignerHex
                                            + (challengeSignerHex.length === 64 ? '01' : '')))
          return {
            url_prefix: readURL,
            address,
            token,
            server: gaiaHubUrl
          }
        })
    }

    /**
     * These two functions are app-specific connections to gaia hub,
     *   they read the user data object for information on setting up
     *   a hub connection, and store the hub config to localstorage
     * @param {UserSession} caller - the instance calling this function
     * @private
     * @returns {Promise} that resolves to the new gaia hub connection
     */
    export function setLocalGaiaHubConnection(caller: UserSession): Promise<GaiaHubConfig> {
      const userData = caller.loadUserData()

      if (!userData) {
        throw new InvalidStateError('Missing userData')
      }

      if (!userData.hubUrl) {
        userData.hubUrl = BLOCKSTACK_DEFAULT_GAIA_HUB_URL
      }

      return connectToGaiaHub(userData.hubUrl,
                              userData.appPrivateKey,
                              userData.associationToken)
        .then((gaiaConfig) => {
          userData.gaiaHubConfig = gaiaConfig
          return gaiaConfig
        })
    }

    export function getOrSetLocalGaiaHubConnection(caller: UserSession): Promise<GaiaHubConfig> {
      const userData = caller.store.getSessionData().userData
      Iif (!userData) {
        throw new InvalidStateError('Missing userData')
      }
      const hubConfig = userData.gaiaHubConfig
      Eif (hubConfig) {
        return Promise.resolve(hubConfig)
      }
      return setLocalGaiaHubConnection(caller)
    }

    export function getBucketUrl(gaiaHubUrl: string, appPrivateKey: string): Promise<string> {
      let challengeSigner
      try {
        challengeSigner = bitcoin.ECPair.fromPrivateKey(new Buffer(appPrivateKey, 'hex'))
      } catch (e) {
        return Promise.reject(e)
      }

      return fetch(`${gaiaHubUrl}/hub_info`)
        .then(response => response.text())
        .then(responseText => JSON.parse(responseText))
        .then((responseJSON) => {
          const readURL = responseJSON.read_url_prefix
          const address = ecPairToAddress(challengeSigner)
          const bucketUrl = `${readURL}${address}/`
          return bucketUrl
        })
    }