if logged in redirect to getting-started page with username in the query param

pages/auth/sso/[provider].tsx

@@ -3,10 +3,13 @@ import { signIn } from "next-auth/react";
 import { useRouter } from "next/router";
 
 import { asStringOrNull } from "@lib/asStringOrNull";
+import { getSession } from "@lib/auth";
 import prisma from "@lib/prisma";
 import { isSAMLLoginEnabled, hostedCal, samlTenantID, samlProductID, samlTenantProduct } from "@lib/saml";
 import { inferSSRProps } from "@lib/types/inferSSRProps";
 
+import { ssrInit } from "@server/lib/ssr";
+
 export type SSOProviderPageProps = inferSSRProps<typeof getServerSideProps>;
 
 export default function Type(props: SSOProviderPageProps) {
@@ -38,17 +41,32 @@ export const getServerSideProps = async (context: GetServerSidePropsContext) =>
   // (would be even better to assert them instead of typecasting)
   const providerParam = asStringOrNull(context.query.provider);
   const emailParam = asStringOrNull(context.query.email);
+  const usernameParam = asStringOrNull(context.query.username);
 
   if (!providerParam) {
     throw new Error(`File is not named sso/[provider]`);
   }
 
+  const { req } = context;
+
+  const session = await getSession({ req });
+  const ssr = await ssrInit(context);
+
+  if (session) {
+    return {
+      redirect: {
+        destination: "/getting-started" + (usernameParam ? `?username=${usernameParam}` : ""),
+        permanent: false,
+      },
+    };
+  }
+
   let error: string | null = null;
 
   let tenant = samlTenantID;
   let product = samlProductID;
 
-  if (providerParam === "saml") {
+  if (providerParam === "saml" && hostedCal) {
     if (!emailParam) {
       error = "Email not provided";
     } else {
@@ -73,6 +91,7 @@ export const getServerSideProps = async (context: GetServerSidePropsContext) =>
 
   return {
     props: {
+      trpcState: ssr.dehydrate(),
       provider: providerParam,
       isSAMLLoginEnabled,
       hostedCal,