swc/crates/swc_bundler/tests/.cache/deno/a511b4e5fc5f1025fd4690a1c12105ba4fff6836.ts
2021-11-09 20:42:49 +09:00

57 lines
1.3 KiB
TypeScript

// Loaded from https://deno.land/x/forwarded@0.0.9/mod.ts
import { ServerRequest } from 'https://deno.land/std@0.101.0/http/server.ts'
type Req = Pick<ServerRequest, 'headers'> & { conn: Pick<ServerRequest['conn'], 'remoteAddr'> }
/**
* Get all addresses in the request, using the `X-Forwarded-For` header.
*
* @param req Request object
*/
export function forwarded(req: Req) {
// simple header parsing
const proxyAddrs = parse(req.headers.get('x-forwarded-for') ?? '')
const { hostname: socketAddr } = req.conn.remoteAddr as Deno.NetAddr
// return all addresses
return [socketAddr].concat(proxyAddrs)
}
/**
* Parse the `X-Forwarded-For` header.
*
* @param header Header value
*/
export function parse(header: string) {
const list = []
let start = header.length
let end = header.length
// gather addresses, backwards
for (let i = header.length - 1; i >= 0; i--) {
switch (header.charCodeAt(i)) {
case 0x20 /* */:
if (start === end) start = end = i
break
case 0x2c /* , */:
if (start !== end) list.push(header.substring(start, end))
start = end = i
break
default:
start = i
break
}
}
// final address
if (start !== end) list.push(header.substring(start, end))
return list
}