56 lines
2.0 KiB
TypeScript
56 lines
2.0 KiB
TypeScript
import { CONSOLE_URL, WEBAPP_URL, WEBSITE_URL, EMBED_LIB_URL } from "@calcom/lib/constants";
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// It ensures that redirection URL safe where it is accepted through a query params or other means where user can change it.
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export const getSafeRedirectUrl = (url = "") => {
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if (!url) {
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return null;
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}
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//It is important that this fn is given absolute URL because urls that don't start with HTTP can still deceive browser into redirecting to another domain
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if (url.search(/^https?:\/\//) === -1) {
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throw new Error("Pass an absolute URL");
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}
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const urlParsed = new URL(url);
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// Avoid open redirection security vulnerability
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if (![CONSOLE_URL, WEBAPP_URL, WEBSITE_URL].some((u) => new URL(u).origin === urlParsed.origin)) {
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url = `${WEBAPP_URL}/`;
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}
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return url;
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};
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// There is a copy of this fn at packages/embed/embed-core/src/preview.ts as that can't import this function. Keep it in sync
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export function isSafeUrlToLoadResourceFrom(urlString: string) {
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try {
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const url = new URL(urlString);
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if (url.protocol !== "http:" && url.protocol !== "https:") {
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return false;
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}
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// Allow localhost for development
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if (url.hostname === "localhost" || url.hostname === "127.0.0.1") {
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return true;
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}
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const webappUrl = new URL(WEBAPP_URL);
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const embedLibUrl = new URL(EMBED_LIB_URL);
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const urlTldPlus1 = getTldPlus1(url.hostname);
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const webappTldPlus1 = getTldPlus1(webappUrl.hostname);
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const embedLibTldPlus1 = getTldPlus1(embedLibUrl.hostname);
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// URLs must share the same TLD+1 so that org domains are also allowed.
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return [webappTldPlus1, embedLibTldPlus1].includes(urlTldPlus1);
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} catch {
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return false;
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}
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function getTldPlus1(hostname: string) {
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// Note: It doesn't support multipart tlds like .co.uk and thus makes only one part tld's safe like .com(and thus cal.com)
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// If we want to use it elsewhere as well(apart from embed/preview.ts) we must consider Public Suffix List
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return hostname.split(".").slice(-2).join(".");
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}
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}
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