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Viewing file:     validator.js (1.17 KB)      -rw-r--r--

'use strict'

const { createContext, runInContext } = require('vm')

module.exports = validator

function validator (opts = {}) {
  const {
    ERR_PATHS_MUST_BE_STRINGS = () => 'fast-redact - Paths must be (non-empty) strings',
    ERR_INVALID_PATH = (s) => `fast-redact – Invalid path (${s})`
  } = opts

  return function validate ({ paths }) {
    paths.forEach((s) => {
      if (typeof s !== 'string') {
        throw Error(ERR_PATHS_MUST_BE_STRINGS())
      }
      try {
        if (/〇/.test(s)) throw Error()
        const proxy = new Proxy({}, { get: () => proxy, set: () => { throw Error() } })
        const expr = (s[0] === '[' ? '' : '.') + s.replace(/^\*/, '〇').replace(/\.\*/g, '.〇').replace(/\[\*\]/g, '[〇]')
        if (/\n|\r|;/.test(expr)) throw Error()
        if (/\/\*/.test(expr)) throw Error()
        runInContext(`
          (function () {
            'use strict'
            o${expr}
            if ([o${expr}].length !== 1) throw Error()
          })()
        `, createContext({ o: proxy, 〇: null }), {
          codeGeneration: { strings: false, wasm: false }
        })
      } catch (e) {
        throw Error(ERR_INVALID_PATH(s))
      }
    })
  }
}