65 lines
1.8 KiB
TypeScript
65 lines
1.8 KiB
TypeScript
import { NextApiRequest, NextApiResponse } from 'next'
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import { promisify } from 'util'
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import { pipeline } from 'stream'
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import { getFunctionUrl } from 'web/lib/firebase/api-call'
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import { V2CloudFunction } from 'common/envs/prod'
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import fetch, { Headers, Response } from 'node-fetch'
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function getProxiedRequestHeaders(req: NextApiRequest, whitelist: string[]) {
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const result = new Headers()
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for (const name of whitelist) {
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const v = req.headers[name.toLowerCase()]
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if (Array.isArray(v)) {
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for (const vv of v) {
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result.append(name, vv)
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}
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} else if (v != null) {
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result.append(name, v)
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}
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}
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result.append('X-Forwarded-For', req.socket.remoteAddress || '')
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result.append('Via', 'Vercel public API')
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return result
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}
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function getProxiedResponseHeaders(res: Response, whitelist: string[]) {
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const result: { [k: string]: string } = {}
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for (const name of whitelist) {
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const v = res.headers.get(name)
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if (v != null) {
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result[name] = v
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}
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}
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return result
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}
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export const fetchBackend = (req: NextApiRequest, name: V2CloudFunction) => {
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const url = getFunctionUrl(name)
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const headers = getProxiedRequestHeaders(req, [
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'Authorization',
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'Content-Length',
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'Content-Type',
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'Origin',
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])
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const hasBody = req.method != 'HEAD' && req.method != 'GET'
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const opts = { headers, method: req.method, body: hasBody ? req : undefined }
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return fetch(url, opts)
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}
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export const forwardResponse = async (
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res: NextApiResponse,
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backendRes: Response
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) => {
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const headers = getProxiedResponseHeaders(backendRes, [
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'Access-Control-Allow-Origin',
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'Content-Type',
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'Cache-Control',
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'ETag',
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'Vary',
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])
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res.writeHead(backendRes.status, headers)
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if (backendRes.body != null) {
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return await promisify(pipeline)(backendRes.body, res)
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}
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}
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