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Viewing file:     restorer.js (2.44 KB)      -rw-r--r--

'use strict'

const { groupRestore, nestedRestore } = require('./modifiers')

module.exports = restorer

function restorer ({ secret, wcLen }) {
  return function compileRestore () {
    if (this.restore) return
    const paths = Object.keys(secret)
    const resetters = resetTmpl(secret, paths)
    const hasWildcards = wcLen > 0
    const state = hasWildcards ? { secret, groupRestore, nestedRestore } : { secret }
    /* eslint-disable-next-line */
    this.restore = Function(
      'o',
      restoreTmpl(resetters, paths, hasWildcards)
    ).bind(state)
  }
}

/**
 * Mutates the original object to be censored by restoring its original values
 * prior to censoring.
 *
 * @param {object} secret Compiled object describing which target fields should
 * be censored and the field states.
 * @param {string[]} paths The list of paths to censor as provided at
 * initialization time.
 *
 * @returns {string} String of JavaScript to be used by `Function()`. The
 * string compiles to the function that does the work in the description.
 */
function resetTmpl (secret, paths) {
  return paths.map((path) => {
    const { circle, escPath, leadingBracket } = secret[path]
    const delim = leadingBracket ? '' : '.'
    const reset = circle
      ? `o.${circle} = secret[${escPath}].val`
      : `o${delim}${path} = secret[${escPath}].val`
    const clear = `secret[${escPath}].val = undefined`
    return `
      if (secret[${escPath}].val !== undefined) {
        try { ${reset} } catch (e) {}
        ${clear}
      }
    `
  }).join('')
}

/**
 * Creates the body of the restore function
 *
 * Restoration of the redacted object happens
 * backwards, in reverse order of redactions,
 * so that repeated redactions on the same object
 * property can be eventually rolled back to the
 * original value.
 *
 * This way dynamic redactions are restored first,
 * starting from the last one working backwards and
 * followed by the static ones.
 *
 * @returns {string} the body of the restore function
 */
function restoreTmpl (resetters, paths, hasWildcards) {
  const dynamicReset = hasWildcards === true ? `
    const keys = Object.keys(secret)
    const len = keys.length
    for (var i = len - 1; i >= ${paths.length}; i--) {
      const k = keys[i]
      const o = secret[k]
      if (o.flat === true) this.groupRestore(o)
      else this.nestedRestore(o)
      secret[k] = null
    }
  ` : ''

  return `
    const secret = this.secret
    ${dynamicReset}
    ${resetters}
    return o
  `
}