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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | 7x 7x 7x 7x 7x 7x 7x 7x 7x 21x 6x 15x 15x 15x 15x 14x 15x 15x 17x 7x 34x 122x 122x 57x 18x 104x 38x 38x 16x 16x 38x 104x 7x 12x 7x 19x 19x 79x 18x 61x 6x 55x 55x 19x 104x 54x 50x 96x 12x 38x 79x 10x 69x 136x 8x 61x 7x 186x 170x 16x 7x 186x 186x 186x 96x 90x | import { CloudFrontHeaders, CloudFrontRequest } from 'aws-lambda'
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([
'age',
'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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