/opt/canhelp/node_modules/next/dist/esm/server/lib/router-utils
Edit: /opt/canhelp/node_modules/next/dist/esm/server/lib/router-utils/block-cross-site.js (2990B)
import { parseUrl } from '../../../lib/url';
import { warnOnce } from '../../../build/output/log';
import { isCsrfOriginAllowed } from '../../app-render/csrf-protection';
function warnOrBlockRequest(res, origin, mode) {
const originString = origin ? `from ${origin}` : '';
if (mode === 'warn') {
warnOnce(`Cross origin request detected ${originString} to /_next/* resource. In a future major version of Next.js, you will need to explicitly configure "allowedDevOrigins" in next.config to allow this.\nRead more: https://nextjs.org/docs/app/api-reference/config/next-config-js/allowedDevOrigins`);
return false;
}
warnOnce(`Blocked cross-origin request ${originString} to /_next/* resource. To allow this, configure "allowedDevOrigins" in next.config\nRead more: https://nextjs.org/docs/app/api-reference/config/next-config-js/allowedDevOrigins`);
if ('statusCode' in res) {
res.statusCode = 403;
}
res.end('Unauthorized');
return true;
}
function isInternalDevEndpoint(req) {
if (!req.url) return false;
try {
// TODO: We should standardize on a single prefix for this
const isMiddlewareRequest = req.url.includes('/__nextjs');
const isInternalAsset = req.url.includes('/_next');
// Static media requests are excluded, as they might be loaded via CSS and would fail
// CORS checks.
const isIgnoredRequest = req.url.includes('/_next/image') || req.url.includes('/_next/static/media');
return !isIgnoredRequest && (isInternalAsset || isMiddlewareRequest);
} catch (err) {
return false;
}
}
export const blockCrossSite = (req, res, allowedDevOrigins, hostname)=>{
// in the future, these will be blocked by default when allowed origins aren't configured.
// for now, we warn when allowed origins aren't configured
const mode = typeof allowedDevOrigins === 'undefined' ? 'warn' : 'block';
const allowedOrigins = [
'*.localhost',
'localhost',
...allowedDevOrigins || []
];
if (hostname) {
allowedOrigins.push(hostname);
}
// only process internal URLs/middleware
if (!isInternalDevEndpoint(req)) {
return false;
}
// block non-cors request from cross-site e.g. script tag on
// different host
if (req.headers['sec-fetch-mode'] === 'no-cors' && req.headers['sec-fetch-site'] === 'cross-site') {
return warnOrBlockRequest(res, undefined, mode);
}
// ensure websocket requests from allowed origin
const rawOrigin = req.headers['origin'];
if (rawOrigin) {
const parsedOrigin = parseUrl(rawOrigin);
if (parsedOrigin) {
const originLowerCase = parsedOrigin.hostname.toLowerCase();
if (!isCsrfOriginAllowed(originLowerCase, allowedOrigins)) {
return warnOrBlockRequest(res, originLowerCase, mode);
}
}
}
return false;
};
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