# All files / src utils.ts

55.68% Statements 49/88
82.14% Branches 23/28
82.35% Functions 14/17
54.65% Lines 47/86

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    import * as url from 'url'
    import { ECPair, address, crypto } from 'bitcoinjs-lib'
    import { config } from './config'
    import { Logger } from './logger'

    /**
     *  @ignore
     */
    export const BLOCKSTACK_HANDLER = 'blockstack'

    /**
     * Time
     * @private
     * @ignore
     */
    export function nextYear() {
      return new Date(
        new Date().setFullYear(
          new Date().getFullYear() + 1
        )
      )
    }

    /**
     * Time
     * @private
     * @ignore
     */
    export function nextMonth() {
      return new Date(
        new Date().setMonth(
          new Date().getMonth() + 1
        )
      )
    }

    /**
     * Time
     * @private
     * @ignore
     */
    export function nextHour() {
      return new Date(
        new Date().setHours(
          new Date().getHours() + 1
        )
      )
    }

    /**
     * Query Strings
     * @private
     * @ignore
     */

    export function updateQueryStringParameter(uri: string, key: string, value: string) {
      const re = new RegExp(`([?&])${key}=.*?(&|$)`, 'i')
      const separator = uri.indexOf('?') !== -1 ? '&' : '?'
      if (uri.match(re)) {
        return uri.replace(re, `$1${key}=${value}$2`)
      } else {
        return `${uri}${separator}${key}=${value}`
      }
    }

    /**
     * Versioning
     * @param {string} v1 - the left half of the version inequality
     * @param {string} v2 - right half of the version inequality
     * @returns {bool} iff v1 >= v2
     * @private
     * @ignore
     */

    export function isLaterVersion(v1: string, v2: string) {
      if (v1 === undefined) {
        v1 = '0.0.0'
      }

      if (v2 === undefined) {
        v2 = '0.0.0'
      }

      const v1tuple = v1.split('.').map(x => parseInt(x, 10))
      const v2tuple = v2.split('.').map(x => parseInt(x, 10))

      for (let index = 0; index < v2.length; index++) {
        if (index >= v1.length) {
          v2tuple.push(0)
        }
        if (v1tuple[index] < v2tuple[index]) {
          return false
        }
      }
      return true
    }

    /**
     * Time
     * @private
     * @ignore
     */
    export function hexStringToECPair(skHex: string): ECPair.ECPairInterface {
      const ecPairOptions = {
        network: config.network.layer1,
        compressed: true
      }

      if (skHex.length === 66) {
        if (skHex.slice(64) !== '01') {
          throw new Error('Improperly formatted private-key hex string. 66-length hex usually '
                          + 'indicates compressed key, but last byte must be == 1')
        }
        return ECPair.fromPrivateKey(Buffer.from(skHex.slice(0, 64), 'hex'), ecPairOptions)
      } else if (skHex.length === 64) {
        ecPairOptions.compressed = false
        return ECPair.fromPrivateKey(Buffer.from(skHex, 'hex'), ecPairOptions)
      } else {
        throw new Error('Improperly formatted private-key hex string: length should be 64 or 66.')
      }
    }

    /**
     *
     * @ignore
     */
    export function ecPairToHexString(secretKey: ECPair.ECPairInterface) {
      const ecPointHex = secretKey.privateKey.toString('hex')
      if (secretKey.compressed) {
        return `${ecPointHex}01`
      } else {
        return ecPointHex
      }
    }

    /**
     * Time
     * @private
     * @ignore
     */
    export function ecPairToAddress(keyPair: ECPair.ECPairInterface) {
      return address.toBase58Check(crypto.hash160(keyPair.publicKey), keyPair.network.pubKeyHash)
    }

    /**
     * UUIDs
     * @private
     * @ignore
     */
    export function makeUUID4() {
      let d = new Date().getTime()
      if (typeof performance !== 'undefined' && typeof performance.now === 'function') {
        d += performance.now() // use high-precision timer if available
      }
      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
        const r = (d + Math.random() * 16) % 16 | 0
        d = Math.floor(d / 16)
        return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16)
      })
    }

    /**
     * Checks if both urls pass the same origin check & are absolute
     * @param  {[type]}  uri1 first uri to check
     * @param  {[type]}  uri2 second uri to check
     * @return {Boolean} true if they pass the same origin check
     * @private
     * @ignore
     */
    export function isSameOriginAbsoluteUrl(uri1: string, uri2: string) {
      const parsedUri1 = url.parse(uri1)
      const parsedUri2 = url.parse(uri2)

      const port1 = parseInt(parsedUri1.port || '0', 10) | 0 || (parsedUri1.protocol === 'https:' ? 443 : 80)
      const port2 = parseInt(parsedUri2.port || '0', 10) | 0 || (parsedUri2.protocol === 'https:' ? 443 : 80)

      const match = {
        scheme: parsedUri1.protocol === parsedUri2.protocol,
        hostname: parsedUri1.hostname === parsedUri2.hostname,
        port: port1 === port2,
        absolute: (uri1.includes('http://') || uri1.includes('https://'))
        && (uri2.includes('http://') || uri2.includes('https://'))
      }

      return match.scheme && match.hostname && match.port && match.absolute
    }

    /**
     * Returns the global scope `Window`, `WorkerGlobalScope`, or `NodeJS.Global` if available in the
     * currently executing environment.
     * @see https://developer.mozilla.org/en-US/docs/Web/API/Window/self
     * @see https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/self
     * @see https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope
     *
     * This could be switched to `globalThis` once it is standardized and widely available.
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis
     */
    function getGlobalScope(): Window {
      if (typeof self !== 'undefined') {
        return self
      }
      if (typeof window !== 'undefined') {
        return window
      }
      // This function is meant to be called when accessing APIs that are typically only available in
      // web-browser/DOM environments, but we also want to support situations where running in Node.js
      // environment, and a polyfill was added to the Node.js `global` object scope without adding the
      // `window` global object as well.
      if (typeof global !== 'undefined') {
        return (global as unknown) as Window
      }
      throw new Error('Unexpected runtime environment - no supported global scope (`window`, `self`, `global`) available')
    }

    function getAPIUsageErrorMessage(
      scopeObject: unknown,
      apiName: string,
      usageDesc?: string
    ): string {
      if (usageDesc) {
        return `Use of '${usageDesc}' requires \`${apiName}\` which is unavailable on the '${scopeObject}' object within the currently executing environment.`
      } else {
        return `\`${apiName}\` is unavailable on the '${scopeObject}' object within the currently executing environment.`
      }
    }

    interface GetGlobalObjectOptions {
      /**
       * Throw an error if the object is not found.
       * @default false
       */
      throwIfUnavailable?: boolean;
      /**
       * Additional information to include in an error if thrown.
       */
      usageDesc?: string;
      /**
       * If the object is not found, return an new empty object instead of undefined.
       * Requires [[throwIfUnavailable]] to be falsey.
       * @default false
       */
      returnEmptyObject?: boolean;
    }

    /**
     * Returns an object from the global scope (`Window` or `WorkerGlobalScope`) if it
     * is available within the currently executing environment.
     * When executing within the Node.js runtime these APIs are unavailable and will be
     * `undefined` unless the API is provided via polyfill.
     * @see https://developer.mozilla.org/en-US/docs/Web/API/Window/self
     * @ignore
     */
    export function getGlobalObject<K extends keyof Window>(
      name: K,
      { throwIfUnavailable, usageDesc, returnEmptyObject }: GetGlobalObjectOptions = { }
    ): Window[K] {
      let globalScope: Window
      try {
        globalScope = getGlobalScope()
        if (globalScope) {
          const obj = globalScope[name]
          if (obj) {
            return obj
          }
        }
      } catch (error) {
        Logger.error(`Error getting object '${name}' from global scope '${globalScope}': ${error}`)
      }
      if (throwIfUnavailable) {
        const errMsg = getAPIUsageErrorMessage(globalScope, name.toString(), usageDesc)
        Logger.error(errMsg)
        throw new Error(errMsg)
      }
      if (returnEmptyObject) {
        return {}
      }
      return undefined
    }

    /**
     * Returns a specified subset of objects from the global scope (`Window` or `WorkerGlobalScope`)
     * if they are available within the currently executing environment.
     * When executing within the Node.js runtime these APIs are unavailable will be `undefined`
     * unless the API is provided via polyfill.
     * @see https://developer.mozilla.org/en-US/docs/Web/API/Window/self
     * @ignore
     */
    export function getGlobalObjects<K extends keyof Window>(
      names: K[],
      { throwIfUnavailable, usageDesc, returnEmptyObject }: GetGlobalObjectOptions = {}
    ): Pick<Window, K> {
      let globalScope: Window
      try {
        globalScope = getGlobalScope()
      } catch (error) {
        Logger.error(`Error getting global scope: ${error}`)
        if (throwIfUnavailable) {
          const errMsg = getAPIUsageErrorMessage(globalScope, names[0].toString(), usageDesc)
          Logger.error(errMsg)
          throw errMsg
        } else if (returnEmptyObject) {
          globalScope = {} as any
        }
      }

      const result: Pick<Window, K> = {} as any
      for (let i = 0; i < names.length; i++) {
        const name = names[i]
        try {
          if (globalScope) {
            const obj = globalScope[name]
            if (obj) {
              result[name] = obj
            } else if (throwIfUnavailable) {
              const errMsg = getAPIUsageErrorMessage(globalScope, name.toString(), usageDesc)
              Logger.error(errMsg)
              throw new Error(errMsg)
            } else if (returnEmptyObject) {
              result[name] = {}
            }
          }
        } catch (error) {
          if (throwIfUnavailable) {
            const errMsg = getAPIUsageErrorMessage(globalScope, name.toString(), usageDesc)
            Logger.error(errMsg)
            throw new Error(errMsg)
          }
        }
      }
      return result
    }