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import { EdgeResponse } from '../fingerprint/identificationClientTypes'
export function hasContentType(headers: Headers, ...expectedContentTypes: string[]) {
const contentType = headers.get('Content-Type')?.toLowerCase()
if (contentType) {
return expectedContentTypes.some((expectedContentType) => contentType.startsWith(expectedContentType))
}
return false
}
export function getHeaderOrThrow(headers: Headers, name: string) {
const value = headers.get(name)
if (!value) {
throw new HeaderMissingError(name)
}
return value
}
let localIp: string | undefined
export async function getIp(headers: Headers): Promise<string> {
const ip = headers.get('cf-connecting-ip')
if (ip) {
return ip
}
Iif (import.meta.env.MODE == 'dev') {
console.debug('Fetching local IP for dev mode')
if (localIp === undefined) {
const ipResponse = await fetch('https://checkip.amazonaws.com/')
const ip = await ipResponse.text()
localIp = ip.trim()
}
return localIp
}
throw new HeaderMissingError('cf-connecting-ip')
}
export function isDocumentDestination(headers: Headers) {
return headers.get('Sec-Fetch-Dest')?.includes('document')
}
/**
* Remove a header value from an HTTP header value that uses comma-separated lists to
* separated individual values.
*
* @param headers the `Headers` to update
* @param name the name of the header field to update
* @param value the value to remove from the header field
*/
export function removeHeaderValue(headers: Headers, name: string, value: string) {
const headerValue = headers.get(name)
if (headerValue) {
const headerValues = headerValue.split(',').map((s) => s.trim())
const valueIndex = headerValues.findIndex((v) => v.toLowerCase() === value.toLowerCase())
if (valueIndex !== -1) {
// Only modify the header field when the value is present
headerValues.splice(valueIndex, 1)
if (headerValues.length === 0) {
headers.delete(name)
} else {
headers.set(name, headerValues.join(','))
}
}
}
}
export enum EdgeHeaders {
IpV4Address = 'fp-ip-info-v4-address',
IpV6Address = 'fp-ip-info-v6-address',
BotInfoCategory = 'fp-bot-info-category',
BotInfoProvider = 'fp-bot-info-provider',
BotInfoName = 'fp-bot-info-name',
BotInfoIdentity = 'fp-bot-info-identity',
}
/**
* Set header fields that correspond to the properties from the `EdgeResponse` in the specified `requestHeaders`
*
* @param requestHeaders the `Headers` to update
* @param edgeResponse the `EdgeResponse`
*/
export function setEdgeResponseHeaders(requestHeaders: Headers, edgeResponse?: EdgeResponse) {
setOrRemoveHeaderField(requestHeaders, EdgeHeaders.IpV4Address, edgeResponse?.ip_info.v4?.address)
setOrRemoveHeaderField(requestHeaders, EdgeHeaders.IpV6Address, edgeResponse?.ip_info.v6?.address)
setOrRemoveHeaderField(requestHeaders, EdgeHeaders.BotInfoCategory, edgeResponse?.bot_info?.category)
setOrRemoveHeaderField(requestHeaders, EdgeHeaders.BotInfoProvider, edgeResponse?.bot_info?.provider)
setOrRemoveHeaderField(requestHeaders, EdgeHeaders.BotInfoName, edgeResponse?.bot_info?.name)
setOrRemoveHeaderField(requestHeaders, EdgeHeaders.BotInfoIdentity, edgeResponse?.bot_info?.identity)
}
/**
* If `value` is truthy, sets the header field to the value in the passed headers.
* If `value` is falsy, removes the header field from the headers.
*
* @param headers the `Headers` to update
* @param name the name of the header field
* @param value the value of the header field or a falsy value if the header should not be set
*/
export function setOrRemoveHeaderField(headers: Headers, name: string, value?: string) {
if (value) {
headers.set(name, value)
} else {
headers.delete(name)
}
}
/**
* Append a value to the HTTP header, only if that value is not already in the value
* for the header
*
* @param headers the `Headers` to update
* @param name the name of the header field to update
* @param value the value to add to the header field, if it is not already present
*/
export function appendHeaderValue(headers: Headers, name: string, value: string) {
const headerValue = headers.get(name)
if (headerValue) {
const headerValues = headerValue.split(',').map((s) => s.trim())
const valueIndex = headerValues.findIndex((v) => v.toLowerCase() === value.toLowerCase())
if (valueIndex === -1) {
// Only modify the header field when the value is already present
headerValues.push(value)
headers.set(name, headerValues.join(','))
}
} else {
headers.set(name, value)
}
}
/**
* Merges multiple Headers objects into a new Headers object.
*
* @param {Headers} headers - The base Headers object to start with.
* @param {...Headers} otherHeaders - Additional Headers objects to merge into the base Headers.
* @return {Headers} A new Headers object containing the merged headers.
*/
export function mergeHeaders(headers: Headers, ...otherHeaders: Headers[]): Headers {
const result = new Headers(headers)
for (const otherHeader of otherHeaders) {
for (const [key, value] of otherHeader.entries()) {
result.set(key, value)
}
}
return result
}
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