使用Express-Validator清理Express中的输入

You’ve seen how to validate input that comes from the outside world to your Express app.

您已经了解了如何验证来自外部世界的输入到您的Express应用程序。

There’s one thing you quickly learn when you run a public-facing server: never trust the input.

运行面向公众的服务器时，您很快就会学到一件事：永远不要信任输入。

Even if you sanitize and make sure that people can’t enter weird things using client-side code, you’ll still be subject to people using tools (even just the browser devtools) to POST directly to your endpoints.

即使您进行了消毒并确保人们不能使用客户端代码输入怪异的东西，您仍然会受到使用工具(甚至只是浏览器devtools)直接发布到端点的人的约束。

Or bots trying every possible combination of exploit known to humans.

或者，机器人会尝试人类已知的各种利用方式。

What you need to do is sanitizing your input.

您需要做的是清理您的输入。

The express-validator package you already use to validate input can also conveniently used to perform sanitization.

您已经用于验证输入的express-validator包也可以方便地用于执行清理。

Say you have a POST endpoint that accepts the name, email and age parameters:

假设您有一个POST端点，可以接受名称，电子邮件和年龄参数：

const express = require('express')
const app = express()

app.use(express.json())

app.post('/form', (req, res) => {
  const name  = req.body.name
  const email = req.body.email
  const age   = req.body.age
})

You might validate it using:

您可以使用以下方法验证它：

const express = require('express')
const app = express()

app.use(express.json())

app.post('/form', [
  check('name').isLength({ min: 3 }),
  check('email').isEmail(),
  check('age').isNumeric()
], (req, res) => {
  const name  = req.body.name
  const email = req.body.email
  const age   = req.body.age
})

You can add sanitization by piping the sanitization methods after the validation ones:

您可以通过在验证方法之后加入清理方法来添加清理：

app.post('/form', [
  check('name').isLength({ min: 3 }).trim().escape(),
  check('email').isEmail().normalizeEmail(),
  check('age').isNumeric().trim().escape()
], (req, res) => {
  //...
})

Here I used the methods:

在这里，我使用了以下方法：

• trim() trims characters (whitespace by default) at the beginning and at the end of a string

  trim()在字符串的开头和结尾处修剪字符(默认情况下为空白)

• escape() replaces <, >, &, ', " and / with their corresponding HTML entities

  escape()用相应HTML实体替换< ， > ， & ， ' ， "和/

• normalizeEmail() canonicalizes an email address. Accepts several options to lowercase email addresses or subaddresses (e.g. [e-mail])

  normalizeEmail()规范化电子邮件地址。 接受几个选项来将小写的电子邮件地址或子地址(例如[e-mail] )

Other sanitization methods:

其他消毒方法：

• blacklist() remove characters that appear in the blacklist

  blacklist()删除出现在黑名单中的字符

• whitelist() remove characters that do not appear in the whitelist

  whitelist()删除白名单中未出现的字符

• unescape() replaces HTML encoded entities with <, >, &, ', " and /

  unescape()将HTML编码的实体替换为< ， > ， & ， ' ， "和/

• ltrim() like trim(), but only trims characters at the start of the string

  ltrim()类似于trim()，但仅修剪字符串开头的字符

• rtrim() like trim(), but only trims characters at the end of the string

  rtrim()类似于trim()，但仅修剪字符串末尾的字符

• stripLow() remove ASCII control characters, which are normally invisible

  stripLow()删除通常不可见的ASCII控制字符

Force conversion to a format:

强制转换为格式：

• toBoolean() convert the input string to a boolean. Everything except for ‘0’, ‘false’ and “ returns true. In strict mode only ‘1’ and ‘true’ return true

  toBoolean()将输入字符串转换为布尔值。 除“ 0”，“ false”和“”以外的所有内容均返回true。 在严格模式下，只有'1'和'true'返回true

• toDate() convert the input string to a date, or null if the input is not a date

  toDate()将输入字符串转换为日期，如果输入不是日期，则返回null

• toFloat() convert the input string to a float, or NaN if the input is not a float

  toFloat()将输入字符串转换为浮点数；如果输入不是浮点数，则将其转换为NaN

• toInt() convert the input string to an integer, or NaN if the input is not an integer

  toInt()将输入字符串转换为整数，如果输入不是整数，则将NaN转换为

Like with custom validators, you can create a custom sanitizer.

与自定义验证器一样，您可以创建自定义消毒剂。

In the callback function you just return the sanitized value:

在回调函数中，您只需返回已清理的值：

const sanitizeValue = value => {
  //sanitize...
}

app.post('/form', [
  check('value').customSanitizer(value => {
    return sanitizeValue(value)
  }),
], (req, res) => {
  const value  = req.body.value
})

翻译自: https://flaviocopes.com/express-sanitize-input/