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import type { IncomingMessage } from 'http'
import { parse } from 'next/dist/compiled/content-type'
import isError from '../../../lib/is-error'
import type { SizeLimit } from '../../../types'
import { ApiError } from '../index'
/**
* Parse `JSON` and handles invalid `JSON` strings
* @param str `JSON` string
*/
function parseJson(str: string): object {
if (str.length === 0) {
// special-case empty json body, as it's a common client-side mistake
return {}
}
try {
return JSON.parse(str)
} catch (e) {
throw new ApiError(400, 'Invalid JSON')
}
}
/**
* Parse incoming message like `json` or `urlencoded`
* @param req request object
*/
export async function parseBody(
req: IncomingMessage,
limit: SizeLimit
): Promise<any> {
let contentType
try {
contentType = parse(req.headers['content-type'] || 'text/plain')
} catch {
contentType = parse('text/plain')
}
const { type, parameters } = contentType
const encoding = parameters.charset || 'utf-8'
let buffer
try {
const getRawBody =
require('next/dist/compiled/raw-body') as typeof import('next/dist/compiled/raw-body')
buffer = await getRawBody(req, { encoding, limit })
} catch (e) {
if (isError(e) && e.type === 'entity.too.large') {
throw new ApiError(413, `Body exceeded ${limit} limit`)
} else {
throw new ApiError(400, 'Invalid body')
}
}
const body = buffer.toString()
if (type === 'application/json' || type === 'application/ld+json') {
return parseJson(body)
} else if (type === 'application/x-www-form-urlencoded') {
const qs = require('querystring') as typeof import('querystring')
return qs.decode(body)
} else {
return body
}
}
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