first commit

calcom/apps/web/lib/withEmbedSsr.tsx

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+import type { GetServerSideProps, GetServerSidePropsContext, GetServerSidePropsResult } from "next";
+
+import { WebAppURL } from "@calcom/lib/WebAppURL";
+
+export type EmbedProps = {
+  isEmbed?: boolean;
+};
+
+export default function withEmbedSsr(getServerSideProps: GetServerSideProps) {
+  return async (context: GetServerSidePropsContext): Promise<GetServerSidePropsResult<EmbedProps>> => {
+    const ssrResponse = await getServerSideProps(context);
+    const embed = context.query.embed;
+    const layout = context.query.layout;
+
+    if ("redirect" in ssrResponse) {
+      const destinationUrl = ssrResponse.redirect.destination;
+      let urlPrefix = "";
+
+      // Get the URL parsed from URL so that we can reliably read pathname and searchParams from it.
+      const destinationUrlObj = new WebAppURL(ssrResponse.redirect.destination);
+
+      // If it's a complete URL, use the origin as the prefix to ensure we redirect to the same domain.
+      if (destinationUrl.search(/^(http:|https:).*/) !== -1) {
+        urlPrefix = destinationUrlObj.origin;
+      } else {
+        // Don't use any prefix for relative URLs to ensure we stay on the same domain
+        urlPrefix = "";
+      }
+
+      const destinationQueryStr = destinationUrlObj.searchParams.toString();
+      // Make sure that redirect happens to /embed page and pass on embed query param as is for preserving Cal JS API namespace
+      const newDestinationUrl = `${urlPrefix}${destinationUrlObj.pathname}/embed?${
+        destinationQueryStr ? `${destinationQueryStr}&` : ""
+      }layout=${layout}&embed=${embed}`;
+      return {
+        ...ssrResponse,
+        redirect: {
+          ...ssrResponse.redirect,
+          destination: newDestinationUrl,
+        },
+      };
+    }
+
+    if (!("props" in ssrResponse)) {
+      return ssrResponse;
+    }
+    return {
+      ...ssrResponse,
+      props: {
+        ...ssrResponse.props,
+        isEmbed: true,
+      },
+    };
+  };
+}