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64 lines
2.2 KiB
TypeScript
64 lines
2.2 KiB
TypeScript
// Loaded from https://deno.land/x/tinyhttp@0.1.18/extensions/req/security.ts
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import { isIP, Req, compile, all, proxyaddr } from '../../deps.ts'
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import { Protocol } from '../../types.ts'
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export const trustRemoteAddress = <Request extends Req = Req>(req: Request) => {
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const val = (req.conn.remoteAddr as Deno.NetAddr).hostname
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if (typeof val === 'function') return val
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if (typeof val === 'boolean' && val === true) return () => true
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if (typeof val === 'number') return (_: unknown, i: number) => (val ? i < val : undefined)
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if (typeof val === 'string') return compile(val.split(',').map((x) => x.trim()))
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return compile(val)
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}
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export const getProtocol = <Request extends Req = Req>(req: Request): Protocol => {
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const proto = req.proto.includes('https') ? 'https' : 'http'
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const header = (req.headers.get('X-Forwarded-Proto') as string) ?? proto
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const index = header.indexOf(',')
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if (!trustRemoteAddress(req)) return proto
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// Note: X-Forwarded-Proto is normally only ever a
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// single value, but this is to be safe.
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return (index !== -1 ? header.substring(0, index).trim() : header.trim()) as Protocol
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}
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export const getHostname = <Request extends Req = Req>(req: Request): string | undefined => {
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let host: string = req.headers.get('X-Forwarded-Host') as string
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if (!host || !trustRemoteAddress(req)) {
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host = (req.headers.get('Host') as string) || (req.conn.remoteAddr as Deno.NetAddr).hostname
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}
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if (!host) return
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// IPv6 literal support
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const index = host.indexOf(':', host[0] === '[' ? host.indexOf(']') + 1 : 0)
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return index !== -1 ? host.substring(0, index) : host
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}
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export const getIP = <Request extends Req = Req>(req: Request): string | undefined =>
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proxyaddr(req, trustRemoteAddress(req))?.replace(/^.*:/, '') // striping the redundant prefix addeded by OS to IPv4 address
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export const getIPs = <Request extends Req = Req>(req: Request): string[] | undefined =>
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all(req, trustRemoteAddress(req))
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export const getSubdomains = <Request extends Req = Req>(req: Request, subdomainOffset = 2): string[] => {
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const hostname = getHostname(req)
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if (!hostname) return []
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const subdomains = isIP(hostname) ? [hostname] : hostname.split('.').reverse()
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return subdomains.slice(subdomainOffset)
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}
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