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import { IncomingHttpHeaders, OutgoingHttpHeaders } from 'http'
import { filterCookie } from './cookie'
import { updateCacheControlHeader } from './cache-control'
import { CustomerVariables } from './customer-variables/customer-variables'
import { getPreSharedSecret } from './customer-variables/selectors'
const BLACKLISTED_HEADERS = new Set([
'connection',
'expect',
'keep-alive',
'proxy-authenticate',
'proxy-authorization',
'proxy-connection',
'trailer',
'upgrade',
'x-accel-buffering',
'x-accel-charset',
'x-accel-limit-rate',
'x-accel-redirect',
'x-amzn-auth',
'x-amzn-cf-billing',
'x-amzn-cf-id',
'x-amzn-cf-xff',
'x-amzn-errortype',
'x-amzn-fle-profile',
'x-amzn-header-count',
'x-amzn-header-order',
'x-amzn-lambda-integration-tag',
'x-amzn-requestid',
'x-cache',
'x-forwarded-proto',
'x-real-ip',
'strict-transport-security',
])
const BLACKLISTED_HEADERS_PREFIXES = ['x-edge-', 'x-amz-cf-']
const READ_ONLY_RESPONSE_HEADERS = new Set([
'accept-encoding',
'content-length',
'if-modified-since',
'if-none-match',
'if-range',
'if-unmodified-since',
'transfer-encoding',
'via',
])
const READ_ONLY_REQUEST_HEADERS = new Set(['content-length', 'host', 'transfer-encoding', 'via'])
const CACHE_CONTROL_HEADER_NAME = 'cache-control'
export async function prepareHeadersForIngressAPI(
request: CloudFrontRequest,
variables: CustomerVariables,
isIngressCall: boolean
): Promise<OutgoingHttpHeaders> {
if (!isIngressCall) {
return filterRequestHeaders(request, true)
}
const headers = filterRequestHeaders(request)
headers['fpjs-proxy-client-ip'] = request.clientIp
const preSharedSecret = await getPreSharedSecret(variables)
if (preSharedSecret) {
headers['fpjs-proxy-secret'] = preSharedSecret
}
headers['fpjs-proxy-forwarded-host'] = getHost(request)
return headers
}
export const getHost = (request: CloudFrontRequest) => request.headers['host'][0].value
export function filterRequestHeaders(request: CloudFrontRequest, dropCookies = false): OutgoingHttpHeaders {
return Object.entries(request.headers).reduce((result: { [key: string]: string }, [name, value]) => {
const headerName = name.toLowerCase()
if (dropCookies) {
if (headerName === 'cookie') {
return result
}
}
// Lambda@Edge function can't add read-only headers from a client request to Ingress API request
if (isHeaderAllowedForRequest(headerName)) {
let headerValue = value[0].value
if (headerName === 'cookie') {
headerValue = headerValue.split(/; */).join('; ')
headerValue = filterCookie(headerValue, (key) => key === '_iidt')
}
result[headerName] = headerValue
}
return result
}, {})
}
export const updateResponseHeadersForAgentDownload = (headers: IncomingHttpHeaders) =>
updateResponseHeaders(headers, true)
export function updateResponseHeaders(headers: IncomingHttpHeaders, overrideCacheControl = false): CloudFrontHeaders {
const resultHeaders: CloudFrontHeaders = {}
for (const [key, value] of Object.entries(headers)) {
// Lambda@Edge function can't add read-only headers to response to CloudFront
// So, such headers from IngressAPI response are filtered out before return the response to CloudFront
if (!isHeaderAllowedForResponse(key)) {
continue
}
if (overrideCacheControl && key == CACHE_CONTROL_HEADER_NAME && typeof value === 'string') {
resultHeaders[CACHE_CONTROL_HEADER_NAME] = [
{
key: CACHE_CONTROL_HEADER_NAME,
value: updateCacheControlHeader(value),
},
]
} else if (value) {
resultHeaders[key] = [
{
key: key,
value: value.toString(),
},
]
}
}
return resultHeaders
}
function isHeaderAllowedForRequest(headerName: string) {
if (READ_ONLY_REQUEST_HEADERS.has(headerName) || BLACKLISTED_HEADERS.has(headerName)) {
return false
}
for (let i = 0; i < BLACKLISTED_HEADERS_PREFIXES.length; i++) {
if (headerName.startsWith(BLACKLISTED_HEADERS_PREFIXES[i])) {
return false
}
}
return true
}
function isHeaderAllowedForResponse(headerName: string) {
if (READ_ONLY_RESPONSE_HEADERS.has(headerName) || BLACKLISTED_HEADERS.has(headerName)) {
return false
}
for (let i = 0; i < BLACKLISTED_HEADERS_PREFIXES.length; i++) {
if (headerName.startsWith(BLACKLISTED_HEADERS_PREFIXES[i])) {
return false
}
}
return true
}
export function getOriginForHeaders({ origin }: CloudFrontRequest) {
if (origin?.s3) {
return origin.s3
}
return origin?.custom
}
export function getHeaderValue(request: CloudFrontRequest, name: string) {
const origin = getOriginForHeaders(request)
const headers = origin?.customHeaders
if (!headers?.[name]) {
return null
}
return headers[name][0].value
}
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