Hariom BalharaandGitHub
f905ae7502
* Middleware only logic to add CSP header as Next.js App Router doesnt allow setting header in server component * add tests * Remove nonce from Page Router and fix ts issues * Add checkly test
59 lines
2.3 KiB
TypeScript
59 lines
2.3 KiB
TypeScript
import { IS_PRODUCTION } from "@calcom/lib/constants";
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import { WEBAPP_URL } from "@calcom/lib/constants";
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import { buildNonce } from "./buildNonce";
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function getCspPolicy(nonce: string) {
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//TODO: Do we need to explicitly define it in turbo.json
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const CSP_POLICY = process.env.CSP_POLICY;
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// Note: "non-strict" policy only allows inline styles otherwise it's the same as "strict"
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// We can remove 'unsafe-inline' from style-src when we add nonces to all style tags
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// Maybe see how @next-safe/middleware does it if it's supported.
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const useNonStrictPolicy = CSP_POLICY === "non-strict";
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// We add WEBAPP_URL to img-src because of booking pages, which end up loading images from app.cal.com on cal.com
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// FIXME: Write a layer to extract out EventType Analytics tracking endpoints and add them to img-src or connect-src as needed. e.g. fathom, Google Analytics and others
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return `
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default-src 'self' ${IS_PRODUCTION ? "" : "data:"};
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script-src ${
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IS_PRODUCTION
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? // 'self' 'unsafe-inline' https: added for Browsers not supporting strict-dynamic
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`'nonce-${nonce}' 'strict-dynamic' 'self' 'unsafe-inline' https:`
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: // Note: We could use 'strict-dynamic' with 'nonce-..' instead of unsafe-inline but there are some streaming related scripts that get blocked(because they don't have nonce on them). It causes a really frustrating full page error model by Next.js to show up sometimes
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"'unsafe-inline' 'unsafe-eval' https: http:"
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};
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object-src 'none';
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base-uri 'none';
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child-src app.cal.com;
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style-src 'self' ${
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IS_PRODUCTION ? (useNonStrictPolicy ? "'unsafe-inline'" : "") : "'unsafe-inline'"
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} app.cal.com;
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font-src 'self';
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img-src 'self' ${WEBAPP_URL} https://img.youtube.com https://eu.ui-avatars.com/api/ data:;
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connect-src 'self'
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`;
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}
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export function getCspNonce() {
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const nonce = buildNonce(crypto.getRandomValues(new Uint8Array(22)));
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return nonce;
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}
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export function getCspHeader({ shouldEnforceCsp, nonce }: { shouldEnforceCsp: boolean; nonce: string }) {
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const cspHeaderName = shouldEnforceCsp
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? "Content-Security-Policy"
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: /*"Content-Security-Policy-Report-Only"*/ null;
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if (!cspHeaderName) {
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return null;
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}
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const cspHeaderValue = getCspPolicy(nonce)
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.replace(/\s{2,}/g, " ")
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.trim();
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return { name: cspHeaderName, value: cspHeaderValue };
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}
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