@datadome/module-nextjs
Version:
DataDome module for Next.js applications
284 lines • 12.4 kB
JavaScript
import { NextResponse } from 'next/server';
import { DEFAULT_SERVER_SIDE_URL, DEFAULT_TIMEOUT, DEFAULT_URI_REGEX_EXCLUSION, MODULE_NAME, MODULE_VERSION, } from './constants';
import { getCookieData, getAuthorizationLength, getHeadersList, stringify, convertHeadersToMap, collectGraphQL, isGraphQLDataAvailable, isGraphQLRequest, parseCookieAttributes, } from './utils';
function getModuleDefaults() {
return {
enableGraphQLSupport: false,
endpointHost: DEFAULT_SERVER_SIDE_URL,
logger: console,
maximumBodySize: 25 * 1024,
moduleName: MODULE_NAME,
moduleVersion: MODULE_VERSION,
timeout: DEFAULT_TIMEOUT,
urlPatternExclusion: DEFAULT_URI_REGEX_EXCLUSION,
};
}
export class DataDomeMiddleware {
constructor(serverSideKey, parameters) {
const finalParameters = Object.assign({}, getModuleDefaults(), parameters);
const { moduleName, moduleVersion, urlPatternExclusion, logger, enableGraphQLSupport, maximumBodySize } = finalParameters;
let { endpointHost, timeout } = finalParameters;
if (serverSideKey == null || serverSideKey === '') {
throw new Error('Missing API key');
}
if (timeout <= 0) {
timeout = DEFAULT_TIMEOUT;
logger.warn(`[DataDome] using default timeout of ${timeout}ms`);
}
if (!/https?:\/\//i.test(endpointHost)) {
endpointHost = 'https://' + endpointHost;
}
logger.info(`[DataDome] using endpoint url: ${endpointHost}`);
this.serverSideKey = serverSideKey;
this.moduleName = moduleName;
this.moduleVersion = moduleVersion;
this.logger = logger;
this.endpointHost = endpointHost;
this.urlPatternExclusion = new RegExp(urlPatternExclusion, 'i');
this.timeout = timeout;
this.enableGraphQLSupport = enableGraphQLSupport;
this.maximumBodySize = maximumBodySize;
}
async handleRequest(req, res = NextResponse.next()) {
if (!this.isRequestProtected(req)) {
return res;
}
const requestData = await this.buildRequestPayload(req);
const datadomeRes = await this.sendRequest(req, requestData);
if (!datadomeRes) {
return res;
}
return this.handleResponse(req, res, datadomeRes);
}
isRequestProtected(req) {
return !this.urlPatternExclusion.test(req.nextUrl.pathname);
}
async buildRequestPayload(req) {
var _a, _b;
const clientId = getCookieData(req.cookies);
const cookiesLength = (_b = (_a = req.headers.get('cookie')) === null || _a === void 0 ? void 0 : _a.length) !== null && _b !== void 0 ? _b : 0;
const contentType = req.headers.get('content-type');
const contentLength = parseInt(req.headers.get('content-length') || '0');
const protocol = req.headers.get('x-forwarded-proto');
const requestData = {
Key: this.serverSideKey,
IP: (req.headers.get('x-forwarded-for') || '127.0.0.1').split(',')[0],
RequestModuleName: this.moduleName,
ModuleVersion: this.moduleVersion,
AuthorizationLen: getAuthorizationLength(req),
Accept: req.headers.get('accept'),
AcceptEncoding: req.headers.get('accept-encoding'),
AcceptLanguage: req.headers.get('accept-language'),
AcceptCharset: req.headers.get('accept-charset'),
CacheControl: req.headers.get('cache-control'),
ClientID: clientId,
Connection: req.headers.get('connection'),
ContentType: contentType,
CookiesLen: cookiesLength,
From: req.headers.get('from'),
HeadersList: getHeadersList(req),
Host: req.headers.get('host'),
JA4: req.headers.get('x-vercel-ja4-digest'),
Method: req.method,
Origin: req.headers.get('origin'),
Port: 0,
Pragma: req.headers.get('pragma'),
PostParamLen: req.headers.get('content-length'),
Protocol: protocol,
Referer: req.headers.get('referer'),
Request: req.nextUrl.pathname + req.nextUrl.search,
ServerHostname: req.headers.get('host'),
ServerName: 'vercel',
ServerRegion: req.headers.get('x-vercel-edge-region') || 'sfo1',
TimeRequest: Date.now() * 1000,
TrueClientIP: req.headers.get('true-client-ip'),
UserAgent: req.headers.get('user-agent'),
Via: req.headers.get('via'),
XForwardedForIP: req.headers.get('x-forwarded-for'),
SecCHDeviceMemory: req.headers.get('sec-ch-device-memory'),
SecCHUA: req.headers.get('sec-ch-ua'),
SecCHUAArch: req.headers.get('sec-ch-ua-arch'),
SecCHUAFullVersionList: req.headers.get('sec-ch-ua-full-version-list'),
SecCHUAMobile: req.headers.get('sec-ch-ua-mobile'),
SecCHUAModel: req.headers.get('sec-ch-ua-model'),
SecCHUAPlatform: req.headers.get('sec-ch-ua-platform'),
SecFetchDest: req.headers.get('sec-fetch-dest'),
SecFetchMode: req.headers.get('sec-fetch-mode'),
SecFetchSite: req.headers.get('sec-fetch-site'),
SecFetchUser: req.headers.get('sec-fetch-user'),
'X-Real-IP': req.headers.get('x-real-ip'),
'X-Requested-With': req.headers.get('x-requested-with'),
};
try {
const fullUrl = new URL(req.url, `${protocol}://${requestData.Host}`);
if (this.enableGraphQLSupport &&
isGraphQLRequest({
method: req.method,
contentType,
url: fullUrl,
bodyExists: contentLength > 0,
})) {
const graphQLData = await collectGraphQL(req, fullUrl, this.maximumBodySize);
if (isGraphQLDataAvailable(graphQLData)) {
requestData.GraphQLOperationType = graphQLData['type'];
requestData.GraphQLOperationName = graphQLData['name'];
requestData.GraphQLOperationCount = graphQLData['count'];
}
}
}
catch (e) {
if (e instanceof TypeError) {
this.logger.error(`Error during the creation of the URL: ${e.message}`);
}
else if (e instanceof Error) {
this.logger.error(`Error during collection of GraphQL data: ${e.message}`);
}
}
return requestData;
}
async sendRequest(req, requestData) {
var _a;
const options = {
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'User-Agent': 'DataDome',
Connection: 'keep-alive',
},
redirect: 'manual',
};
if ((_a = req.headers.get('x-datadome-clientid')) === null || _a === void 0 ? void 0 : _a.length) {
this.logger.debug('[DataDome] Using SessionByHeader');
options.headers['X-DataDome-X-Set-Cookie'] = 'true';
requestData.ClientID = req.headers.get('x-datadome-clientid');
}
options.body = stringify(this.truncateRequestData(requestData));
const dataDomeReq = fetch(this.endpointHost + '/validate-request/', options);
const timeoutPromise = new Promise((resolve, reject) => {
setTimeout(() => {
reject(new Error('Datadome timeout'));
}, this.timeout);
});
try {
return (await Promise.race([dataDomeReq, timeoutPromise]));
}
catch (err) {
if (err instanceof Error) {
this.logger.warn(`[DataDome] ${err.message} - no response within configured timeout of ${this.timeout}ms for request ${req.method} ${req.nextUrl.pathname}`);
}
else {
this.logger.warn(`[DataDome] no response within configured timeout of ${this.timeout}ms for request ${req.method} ${req.nextUrl.pathname}`);
}
return null;
}
}
async handleResponse(req, res, datadomeRes) {
switch (datadomeRes.status) {
case 400:
this.logger.error(`[DataDome] ERROR returned 400 ${datadomeRes.statusText}, ${await datadomeRes.text()}`);
break;
case 200:
case 301:
case 302:
case 401:
case 403:
if (datadomeRes.status !== 200 &&
datadomeRes.status.toString() == datadomeRes.headers.get('X-DataDomeResponse')) {
const clonedHeaders = new Headers();
res.headers.forEach((value, key) => {
if (key.toLowerCase() === 'set-cookie') {
clonedHeaders.append('set-cookie', value);
}
else if (key.toLowerCase() !== 'x-middleware-next') {
clonedHeaders.set(key, value);
}
});
res = new NextResponse(datadomeRes.body, {
...res,
headers: clonedHeaders,
status: datadomeRes.status,
});
}
else {
convertHeadersToMap(req.headers, datadomeRes.headers, 'x-datadome-request-headers').forEach((value, key) => {
res.headers.set(key, value);
});
}
const headersMap = convertHeadersToMap(req.headers, datadomeRes.headers, 'x-datadome-headers');
headersMap.forEach((value, key) => {
if (key.toLowerCase() === 'set-cookie') {
this.setDataDomeCookies(res, value);
}
else {
res.headers.set(key, value);
}
});
this.logger.debug(`[DataDome] response:${res.status}: ${JSON.stringify(Object.fromEntries(res.headers.entries()), null, 2)}`);
}
return res;
}
setDataDomeCookies(res, cookieHeader) {
const parsed = parseCookieAttributes(cookieHeader);
if (parsed) {
res.cookies.set(parsed.name, parsed.value, parsed.options);
}
}
truncateRequestData(requestData) {
const limits = {
secfetchuser: 8,
secchdevicememory: 8,
secchuamobile: 8,
tlsprotocol: 8,
secchuaarch: 16,
contenttype: 64,
secchuaplatform: 32,
secfetchdest: 32,
secfetchmode: 32,
serverregion: 32,
secfetchsite: 64,
tlscipher: 64,
clientid: 128,
from: 128,
'x-requested-with': 128,
'x-real-ip': 128,
acceptcharset: 128,
acceptencoding: 128,
connection: 128,
pragma: 128,
cachecontrol: 128,
graphqloperationname: 128,
secchua: 128,
secchuamodel: 128,
trueclientip: 128,
secchuafullversionlist: 256,
acceptlanguage: 256,
via: 256,
headerslist: 512,
origin: 512,
serverhostname: 512,
servername: 512,
xforwardedforip: -512,
accept: 512,
host: 512,
useragent: 768,
referer: 1024,
request: 2048,
};
for (const key in requestData) {
const k = key;
const value = requestData[k];
const limit = limits[k.toLowerCase()];
if (limit && value && typeof value == 'string' && value.length > Math.abs(limit)) {
this.logger.debug(`[DataDome] truncating header[${limit}]: ${key} - value:${value}`);
if (limit > 0) {
requestData[k] = value.substring(0, limit);
}
else {
requestData[k] = value.slice(limit);
}
}
}
return requestData;
}
}
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