220 lines
6.2 KiB
Markdown
220 lines
6.2 KiB
Markdown
# raw-body
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[![NPM Version][npm-image]][npm-url]
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[![NPM Downloads][downloads-image]][downloads-url]
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[![Node.js Version][node-version-image]][node-version-url]
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[![Build status][travis-image]][travis-url]
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[![Test coverage][coveralls-image]][coveralls-url]
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Gets the entire buffer of a stream either as a `Buffer` or a string.
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Validates the stream's length against an expected length and maximum limit.
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Ideal for parsing request bodies.
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## Install
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This is a [Node.js](https://nodejs.org/en/) module available through the
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[npm registry](https://www.npmjs.com/). Installation is done using the
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[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
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```sh
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$ npm install raw-body
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```
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### TypeScript
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This module includes a [TypeScript](https://www.typescriptlang.org/)
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declaration file to enable auto complete in compatible editors and type
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information for TypeScript projects. This module depends on the Node.js
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types, so install `@types/node`:
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```sh
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$ npm install @types/node
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```
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## API
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<!-- eslint-disable no-unused-vars -->
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```js
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var getRawBody = require('raw-body')
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```
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### getRawBody(stream, [options], [callback])
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**Returns a promise if no callback specified and global `Promise` exists.**
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Options:
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- `length` - The length of the stream.
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If the contents of the stream do not add up to this length,
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an `400` error code is returned.
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- `limit` - The byte limit of the body.
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This is the number of bytes or any string format supported by
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[bytes](https://www.npmjs.com/package/bytes),
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for example `1000`, `'500kb'` or `'3mb'`.
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If the body ends up being larger than this limit,
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a `413` error code is returned.
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- `encoding` - The encoding to use to decode the body into a string.
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By default, a `Buffer` instance will be returned when no encoding is specified.
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Most likely, you want `utf-8`, so setting `encoding` to `true` will decode as `utf-8`.
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You can use any type of encoding supported by [iconv-lite](https://www.npmjs.org/package/iconv-lite#readme).
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You can also pass a string in place of options to just specify the encoding.
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If an error occurs, the stream will be paused, everything unpiped,
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and you are responsible for correctly disposing the stream.
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For HTTP requests, no handling is required if you send a response.
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For streams that use file descriptors, you should `stream.destroy()` or `stream.close()` to prevent leaks.
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## Errors
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This module creates errors depending on the error condition during reading.
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The error may be an error from the underlying Node.js implementation, but is
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otherwise an error created by this module, which has the following attributes:
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* `limit` - the limit in bytes
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* `length` and `expected` - the expected length of the stream
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* `received` - the received bytes
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* `encoding` - the invalid encoding
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* `status` and `statusCode` - the corresponding status code for the error
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* `type` - the error type
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### Types
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The errors from this module have a `type` property which allows for the progamatic
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determination of the type of error returned.
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#### encoding.unsupported
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This error will occur when the `encoding` option is specified, but the value does
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not map to an encoding supported by the [iconv-lite](https://www.npmjs.org/package/iconv-lite#readme)
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module.
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#### entity.too.large
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This error will occur when the `limit` option is specified, but the stream has
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an entity that is larger.
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#### request.aborted
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This error will occur when the request stream is aborted by the client before
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reading the body has finished.
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#### request.size.invalid
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This error will occur when the `length` option is specified, but the stream has
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emitted more bytes.
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#### stream.encoding.set
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This error will occur when the given stream has an encoding set on it, making it
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a decoded stream. The stream should not have an encoding set and is expected to
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emit `Buffer` objects.
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## Examples
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### Simple Express example
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```js
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var contentType = require('content-type')
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var express = require('express')
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var getRawBody = require('raw-body')
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var app = express()
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app.use(function (req, res, next) {
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getRawBody(req, {
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length: req.headers['content-length'],
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limit: '1mb',
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encoding: contentType.parse(req).parameters.charset
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}, function (err, string) {
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if (err) return next(err)
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req.text = string
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next()
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})
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})
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// now access req.text
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```
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### Simple Koa example
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```js
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var contentType = require('content-type')
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var getRawBody = require('raw-body')
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var koa = require('koa')
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var app = koa()
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app.use(function * (next) {
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this.text = yield getRawBody(this.req, {
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length: this.req.headers['content-length'],
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limit: '1mb',
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encoding: contentType.parse(this.req).parameters.charset
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})
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yield next
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})
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// now access this.text
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```
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### Using as a promise
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To use this library as a promise, simply omit the `callback` and a promise is
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returned, provided that a global `Promise` is defined.
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```js
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var getRawBody = require('raw-body')
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var http = require('http')
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var server = http.createServer(function (req, res) {
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getRawBody(req)
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.then(function (buf) {
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res.statusCode = 200
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res.end(buf.length + ' bytes submitted')
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})
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.catch(function (err) {
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res.statusCode = 500
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res.end(err.message)
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})
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})
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server.listen(3000)
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```
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### Using with TypeScript
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```ts
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import * as getRawBody from 'raw-body';
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import * as http from 'http';
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const server = http.createServer((req, res) => {
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getRawBody(req)
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.then((buf) => {
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res.statusCode = 200;
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res.end(buf.length + ' bytes submitted');
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})
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.catch((err) => {
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res.statusCode = err.statusCode;
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res.end(err.message);
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});
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});
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server.listen(3000);
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```
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## License
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[MIT](LICENSE)
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[npm-image]: https://img.shields.io/npm/v/raw-body.svg
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[npm-url]: https://npmjs.org/package/raw-body
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[node-version-image]: https://img.shields.io/node/v/raw-body.svg
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[node-version-url]: https://nodejs.org/en/download/
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[travis-image]: https://img.shields.io/travis/stream-utils/raw-body/master.svg
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[travis-url]: https://travis-ci.org/stream-utils/raw-body
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[coveralls-image]: https://img.shields.io/coveralls/stream-utils/raw-body/master.svg
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[coveralls-url]: https://coveralls.io/r/stream-utils/raw-body?branch=master
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[downloads-image]: https://img.shields.io/npm/dm/raw-body.svg
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[downloads-url]: https://npmjs.org/package/raw-body
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