♻️ Create backend package (#643)

packages/backend/next/session.ts

@@ -0,0 +1,89 @@
+import { withIronSessionApiRoute, withIronSessionSsr } from "iron-session/next";
+import {
+  GetServerSideProps,
+  GetServerSidePropsContext,
+  NextApiHandler,
+} from "next";
+
+import { sessionConfig } from "../session-config";
+import { createSSGHelperFromContext } from "../trpc/context";
+import { composeGetServerSideProps } from "./utils";
+
+export function withSessionRoute(handler: NextApiHandler) {
+  return withIronSessionApiRoute(handler, sessionConfig);
+}
+
+export function withSessionSsr(
+  handler: GetServerSideProps | GetServerSideProps[],
+  options?: {
+    onPrefetch?: (
+      ssg: Awaited<ReturnType<typeof createSSGHelperFromContext>>,
+      ctx: GetServerSidePropsContext,
+    ) => Promise<void>;
+  },
+): GetServerSideProps {
+  const composedHandler = Array.isArray(handler)
+    ? composeGetServerSideProps(...handler)
+    : handler;
+
+  return withIronSessionSsr(async (ctx) => {
+    const ssg = await createSSGHelperFromContext(ctx);
+    await ssg.whoami.get.prefetch(); // always prefetch user
+    if (options?.onPrefetch) {
+      try {
+        await options.onPrefetch(ssg, ctx);
+      } catch {
+        return {
+          notFound: true,
+        };
+      }
+    }
+    const res = await composedHandler(ctx);
+    if ("props" in res) {
+      return {
+        ...res,
+        props: {
+          ...res.props,
+          trpcState: ssg.dehydrate(),
+        },
+      };
+    }
+
+    return res;
+  }, sessionConfig);
+}
+
+/**
+ * Require user to be logged in
+ * @returns
+ */
+export const withAuth: GetServerSideProps = async (ctx) => {
+  if (!ctx.req.session.user || ctx.req.session.user.isGuest) {
+    return {
+      redirect: {
+        destination: "/login",
+        permanent: false,
+      },
+    };
+  }
+
+  return { props: {} };
+};
+
+/**
+ * Require user to be logged in if AUTH_REQUIRED is true
+ * @returns
+ */
+export const withAuthIfRequired: GetServerSideProps = async (ctx) => {
+  if (process.env.AUTH_REQUIRED === "true") {
+    if (!ctx.req.session.user || ctx.req.session.user.isGuest) {
+      return {
+        redirect: {
+          destination: "/login",
+          permanent: false,
+        },
+      };
+    }
+  }
+  return { props: {} };
+};