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86 lines
2.4 KiB
86 lines
2.4 KiB
'use strict'
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const { groupRestore, nestedRestore } = require('./modifiers')
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module.exports = restorer
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function restorer ({ secret, wcLen }) {
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return function compileRestore () {
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if (this.restore) return
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const paths = Object.keys(secret)
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const resetters = resetTmpl(secret, paths)
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const hasWildcards = wcLen > 0
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const state = hasWildcards ? { secret, groupRestore, nestedRestore } : { secret }
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/* eslint-disable-next-line */
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this.restore = Function(
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'o',
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restoreTmpl(resetters, paths, hasWildcards)
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).bind(state)
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}
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}
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/**
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* Mutates the original object to be censored by restoring its original values
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* prior to censoring.
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*
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* @param {object} secret Compiled object describing which target fields should
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* be censored and the field states.
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* @param {string[]} paths The list of paths to censor as provided at
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* initialization time.
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*
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* @returns {string} String of JavaScript to be used by `Function()`. The
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* string compiles to the function that does the work in the description.
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*/
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function resetTmpl (secret, paths) {
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return paths.map((path) => {
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const { circle, escPath, leadingBracket } = secret[path]
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const delim = leadingBracket ? '' : '.'
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const reset = circle
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? `o.${circle} = secret[${escPath}].val`
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: `o${delim}${path} = secret[${escPath}].val`
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const clear = `secret[${escPath}].val = undefined`
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return `
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if (secret[${escPath}].val !== undefined) {
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try { ${reset} } catch (e) {}
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${clear}
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}
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`
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}).join('')
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}
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/**
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* Creates the body of the restore function
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*
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* Restoration of the redacted object happens
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* backwards, in reverse order of redactions,
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* so that repeated redactions on the same object
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* property can be eventually rolled back to the
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* original value.
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*
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* This way dynamic redactions are restored first,
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* starting from the last one working backwards and
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* followed by the static ones.
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*
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* @returns {string} the body of the restore function
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*/
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function restoreTmpl (resetters, paths, hasWildcards) {
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const dynamicReset = hasWildcards === true ? `
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const keys = Object.keys(secret)
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const len = keys.length
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for (var i = len - 1; i >= ${paths.length}; i--) {
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const k = keys[i]
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const o = secret[k]
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if (o.flat === true) this.groupRestore(o)
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else this.nestedRestore(o)
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secret[k] = null
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}
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` : ''
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return `
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const secret = this.secret
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${dynamicReset}
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${resetters}
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return o
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`
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}
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