cypress/packages/proxy/lib/http/util/security.ts

const pumpify = require('pumpify')
const { replaceStream } = require('./replace_stream')
const utf8Stream = require('utf8-stream')

const topOrParentEqualityBeforeRe = /((?:window|self)(?:\.|\[['"](?:top|self)['"]\])?\s*[!=]==?\s*(?:(?:window|self)(?:\.|\[['"]))?)(top|parent)(?![\w])/g
const topOrParentEqualityAfterRe = /(top|parent)((?:["']\])?\s*[!=]==?\s*(?:window|self))/g
const topOrParentLocationOrFramesRe = /([^\da-zA-Z\(\)])?(top|parent)([.])(location|frames)/g
const jiraTopWindowGetterRe = /(!function\s*\((\w{1})\)\s*{\s*return\s*\w{1}\s*(?:={2,})\s*\w{1}\.parent)(\s*}\(\w{1}\))/g

export function strip (html: string) {
  return html
  .replace(topOrParentEqualityBeforeRe, '$1self')
  .replace(topOrParentEqualityAfterRe, 'self$2')
  .replace(topOrParentLocationOrFramesRe, '$1self$3$4')
  .replace(jiraTopWindowGetterRe, '$1 || $2.parent.__Cypress__$3')
}

export function stripStream () {
  return pumpify(
    utf8Stream(),
    replaceStream(
      [
        topOrParentEqualityBeforeRe,
        topOrParentEqualityAfterRe,
        topOrParentLocationOrFramesRe,
        jiraTopWindowGetterRe,
      ],
      [
        '$1self',
        'self$2',
        '$1self$3$4',
        '$1 || $2.parent.__Cypress__$3',
      ],
    ),
  )
}