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100 lines
3.0 KiB
100 lines
3.0 KiB
3 years ago
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'use strict'
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const rx = require('./rx')
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module.exports = redactor
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function redactor ({ secret, serialize, wcLen, strict, isCensorFct, censorFctTakesPath }, state) {
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/* eslint-disable-next-line */
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const redact = Function('o', `
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if (typeof o !== 'object' || o == null) {
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${strictImpl(strict, serialize)}
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}
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const { censor, secret } = this
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${redactTmpl(secret, isCensorFct, censorFctTakesPath)}
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this.compileRestore()
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${dynamicRedactTmpl(wcLen > 0, isCensorFct, censorFctTakesPath)}
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${resultTmpl(serialize)}
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`).bind(state)
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if (serialize === false) {
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redact.restore = (o) => state.restore(o)
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}
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return redact
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}
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function redactTmpl (secret, isCensorFct, censorFctTakesPath) {
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return Object.keys(secret).map((path) => {
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const { escPath, leadingBracket, path: arrPath } = secret[path]
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const skip = leadingBracket ? 1 : 0
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const delim = leadingBracket ? '' : '.'
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const hops = []
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var match
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while ((match = rx.exec(path)) !== null) {
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const [ , ix ] = match
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const { index, input } = match
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if (index > skip) hops.push(input.substring(0, index - (ix ? 0 : 1)))
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}
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var existence = hops.map((p) => `o${delim}${p}`).join(' && ')
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if (existence.length === 0) existence += `o${delim}${path} != null`
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else existence += ` && o${delim}${path} != null`
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const circularDetection = `
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switch (true) {
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${hops.reverse().map((p) => `
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case o${delim}${p} === censor:
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secret[${escPath}].circle = ${JSON.stringify(p)}
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break
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`).join('\n')}
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}
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`
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const censorArgs = censorFctTakesPath
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? `val, ${JSON.stringify(arrPath)}`
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: `val`
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return `
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if (${existence}) {
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const val = o${delim}${path}
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if (val === censor) {
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secret[${escPath}].precensored = true
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} else {
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secret[${escPath}].val = val
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o${delim}${path} = ${isCensorFct ? `censor(${censorArgs})` : 'censor'}
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${circularDetection}
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}
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}
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`
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}).join('\n')
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}
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function dynamicRedactTmpl (hasWildcards, isCensorFct, censorFctTakesPath) {
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return hasWildcards === true ? `
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{
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const { wildcards, wcLen, groupRedact, nestedRedact } = this
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for (var i = 0; i < wcLen; i++) {
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const { before, beforeStr, after, nested } = wildcards[i]
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if (nested === true) {
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secret[beforeStr] = secret[beforeStr] || []
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nestedRedact(secret[beforeStr], o, before, after, censor, ${isCensorFct}, ${censorFctTakesPath})
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} else secret[beforeStr] = groupRedact(o, before, censor, ${isCensorFct}, ${censorFctTakesPath})
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}
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}
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` : ''
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}
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function resultTmpl (serialize) {
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return serialize === false ? `return o` : `
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var s = this.serialize(o)
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this.restore(o)
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return s
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`
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}
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function strictImpl (strict, serialize) {
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return strict === true
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? `throw Error('fast-redact: primitives cannot be redacted')`
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: serialize === false ? `return o` : `return this.serialize(o)`
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}
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