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datadome.ts
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datadome.ts
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import { NextRequest, NextResponse } from 'next/server'
const DATADOME_TIMEOUT = 500
const DATADOME_URI_REGEX_EXCLUSION =
/\.(avi|flv|mka|mkv|mov|mp4|mpeg|mpg|mp3|flac|ogg|ogm|opus|wav|webm|webp|bmp|gif|ico|jpeg|jpg|png|svg|svgz|swf|eot|otf|ttf|woff|woff2|css|less|js)$/i
export default async function datadome(req: NextRequest) {
const { pathname } = req.nextUrl
if (DATADOME_URI_REGEX_EXCLUSION.test(pathname)) {
console.log('ignore datadome')
return
}
const requestData = {
Key: process.env.DATADOME_SERVER_KEY,
RequestModuleName: 'Next.js',
ModuleVersion: '0.1',
ServerName: 'vercel',
/* this should be `x-real-ip` but it doesn't currently work on Edge Functions */
IP: req.headers.get('x-forwarded-for')
? req.headers.get('x-forwarded-for')!.split(',')[0]
: '127.0.0.1',
Port: 0,
TimeRequest: new Date().getTime() * 1000,
Protocol: req.headers.get('x-forwarded-proto'),
Method: req.method,
ServerHostname: req.headers.get('host'),
Request: pathname + encode(Object.fromEntries(req.nextUrl.searchParams)),
HeadersList: getHeadersList(req),
Host: req.headers.get('host'),
UserAgent: req.headers.get('user-agent'),
Referer: req.headers.get('referer'),
Accept: req.headers.get('accept'),
AcceptEncoding: req.headers.get('accept-encoding'),
AcceptLanguage: req.headers.get('accept-language'),
AcceptCharset: req.headers.get('accept-charset'),
Origin: req.headers.get('origin'),
XForwaredForIP: req.headers.get('x-forwarded-for'),
Connection: req.headers.get('connection'),
Pragma: req.headers.get('pragma'),
CacheControl: req.headers.get('cache-control'),
ContentType: req.headers.get('content-type'),
From: req.headers.get('from'),
Via: req.headers.get('via'),
CookiesLen: getCookiesLength(req.cookies),
AuthorizationLen: getAuthorizationLength(req),
PostParamLen: req.headers.get('content-length'),
ClientID: req.cookies.datadome,
ServerRegion: 'sfo1',
}
const dataDomeReq = fetch(
'http://api-cloudflare.datadome.co/validate-request/',
{
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'User-Agent': 'DataDome',
},
body: stringify(requestData),
}
)
const timeoutPromise = new Promise((resolve, reject) => {
setTimeout(() => {
reject(new Error('Datadome timeout'))
}, DATADOME_TIMEOUT)
})
let dataDomeRes: Response
const dataDomeStart = Date.now()
try {
dataDomeRes = (await Promise.race([
dataDomeReq,
timeoutPromise,
])) as Response
} catch (err: any) {
console.error('Datadome failed with:', err.stack)
return
}
console.log(
'Datadome debug',
dataDomeRes.status,
JSON.stringify(Object.fromEntries(dataDomeRes.headers.entries()), null, 2)
)
switch (dataDomeRes.status) {
case 301:
case 302:
case 401:
case 403:
// blocked!
// in the future we can return the bot kind, bot name, etc.
const isBot = dataDomeRes.headers.get('x-datadome-isbot')
if (isBot) {
console.log(
'Bot detected. Name:',
dataDomeRes.headers.get('x-datadome-botname'),
'– Kind:',
dataDomeRes.headers.get('x-datadome-botfamily')
)
}
// Once `pipeTo` is available we could stream to the response instead
return new NextResponse(await dataDomeRes.text(), {
headers: Object.assign(
toHeaders(req.headers, dataDomeRes.headers, 'x-datadome-headers'),
// We're sending the latency for demo purposes, this is not something you need to do
{ 'x-datadome-latency': `${Date.now() - dataDomeStart}` }
),
})
case 400:
// Something is wrong with our authentication
console.log('DataDome returned 400', dataDomeRes.statusText)
return
case 200: {
// next() returns a null body and we'll use it to indicate
// that the request is not blocked
const res = NextResponse.next()
// Add Datadome headers to the response
Object.entries(
toHeaders(req.headers, dataDomeRes.headers, 'x-datadome-headers')
).forEach(([k, v]) => {
res.headers.set(k, v)
})
// We're sending the latency for demo purposes, this is not something you need to do
res.headers.set('x-datadome-latency', `${Date.now() - dataDomeStart}`)
return res
}
}
}
function encode(query: Record<string, string>) {
let e = ''
for (const k in query) {
const v = query[k]
e += `${encodeURIComponent(k)}=${encodeURIComponent(v)}`
}
return e
}
function toHeaders(
reqHeaders: Headers,
dataDomeResHeaders: Headers,
listKey: string
) {
const ret: Record<string, string> = {}
const list = dataDomeResHeaders.get(listKey)!
for (const header of list.split(' ')) {
const value = dataDomeResHeaders.get(header)!
// workaround for a bug in DataDome where the cookie domain gets set to
// the entire public suffix (.vercel.app), which UAs refuse to set cookies for
// e.g.: https://devcenter.heroku.com/articles/cookies-and-herokuapp-com
if (
header.toLowerCase() === 'set-cookie' &&
/domain=\.vercel\.app/i.test(value)
) {
ret[header] = value.replace(
/domain=\.vercel\.app/i,
`Domain=${reqHeaders.get('host')}`
)
} else {
ret[header] = value
}
}
return ret
}
// taken from DataDome-Cloudflare-1.7.0
function getHeadersList(req: NextRequest) {
return [...req.headers.keys()].join(',')
}
// taken from DataDome-Cloudflare-1.7.0
function getAuthorizationLength(req: NextRequest) {
const authorization = req.headers.get('authorization')
return authorization === null ? null : authorization.length
}
// taken from DataDome-Cloudflare-1.7.0
function stringify(obj: Record<string, string | number | null | undefined>) {
return obj
? Object.keys(obj)
.map((key) => {
const value = obj[key]
if (value === undefined) {
return ''
}
return value === null || value === undefined
? encodeURIComponent(key)
: encodeURIComponent(key) + '=' + encodeURIComponent(value)
})
.filter((x) => x.length > 0)
.join('&')
: ''
}
// inspired in DataDome-Cloudflare-1.7.0
function getCookiesLength(cookies: Record<string, string>) {
let cookiesLength = 0
for (const k in cookies) {
cookiesLength += cookies[k].length
}
return cookiesLength
}