♻️ Update posthog identification flow (#686)

apps/web/src/components/auth/auth-layout.tsx

@@ -1,6 +1,6 @@
 import React from "react";
 
-import Logo from "~//logo.svg";
+import Logo from "~/logo.svg";
 
 export const AuthLayout = ({ children }: { children?: React.ReactNode }) => {
   return (

apps/web/src/components/user-provider.tsx

@@ -1,23 +1,11 @@
 import { trpc, UserSession } from "@rallly/backend";
 import { useRouter } from "next/router";
 import { useTranslation } from "next-i18next";
-import posthog from "posthog-js";
-import { PostHogProvider } from "posthog-js/react";
 import React from "react";
 
-import { useRequiredContext } from "./use-required-context";
+import { PostHogProvider } from "@/contexts/posthog";
 
-if (typeof window !== "undefined" && process.env.NEXT_PUBLIC_POSTHOG_API_KEY) {
-  posthog.init(process.env.NEXT_PUBLIC_POSTHOG_API_KEY, {
-    api_host: process.env.NEXT_PUBLIC_POSTHOG_API_HOST,
-    opt_out_capturing_by_default: false,
-    capture_pageview: false,
-    persistence: "memory",
-    capture_pageleave: false,
-    autocapture: false,
-    opt_in_site_apps: true,
-  });
-}
+import { useRequiredContext } from "./use-required-context";
 
 export const UserContext = React.createContext<{
   user: UserSession & { shortName: string };
@@ -73,19 +61,6 @@ export const UserProvider = (props: {
     },
   });
 
-  React.useEffect(() => {
-    if (!process.env.NEXT_PUBLIC_POSTHOG_API_KEY || !user) {
-      return;
-    }
-
-    posthog.identify(
-      user.id,
-      !user.isGuest
-        ? { email: user.email, name: user.name }
-        : { name: user.id },
-    );
-  }, [user]);
-
   const shortName = user
     ? user.isGuest === false
       ? user.name
@@ -97,7 +72,6 @@ export const UserProvider = (props: {
   }
 
   return (
-    <PostHogProvider client={posthog}>
     <UserContext.Provider
       value={{
         user: { ...user, shortName },
@@ -118,9 +92,8 @@ export const UserProvider = (props: {
         },
       }}
     >
-        {props.children}
+      <PostHogProvider>{props.children}</PostHogProvider>
     </UserContext.Provider>
-    </PostHogProvider>
   );
 };
 

apps/web/src/contexts/posthog.tsx

@@ -0,0 +1,42 @@
+import posthog from "posthog-js";
+import { PostHogProvider as Provider } from "posthog-js/react";
+import { useMount } from "react-use";
+
+import { useUser } from "@/components/user-provider";
+
+type PostHogProviderProps = React.PropsWithChildren;
+
+const PostHogProviderInner = (props: PostHogProviderProps) => {
+  const { user } = useUser();
+
+  useMount(() => {
+    // initalize posthog with our user id
+    if (
+      typeof window !== "undefined" &&
+      process.env.NEXT_PUBLIC_POSTHOG_API_KEY
+    ) {
+      posthog.init(process.env.NEXT_PUBLIC_POSTHOG_API_KEY, {
+        api_host: process.env.NEXT_PUBLIC_POSTHOG_API_HOST,
+        opt_out_capturing_by_default: false,
+        capture_pageview: true,
+        persistence: "memory",
+        capture_pageleave: false,
+        autocapture: false,
+        opt_in_site_apps: true,
+        bootstrap: {
+          distinctID: user.id,
+        },
+      });
+    }
+  });
+
+  return <Provider client={posthog}>{props.children}</Provider>;
+};
+
+export const PostHogProvider = (props: PostHogProviderProps) => {
+  if (!process.env.NEXT_PUBLIC_POSTHOG_API_KEY) {
+    return <>{props.children}</>;
+  }
+
+  return <PostHogProviderInner {...props} />;
+};

apps/web/src/pages/auth/invalid-token.tsx

@@ -1,23 +0,0 @@
-import { useTranslation } from "next-i18next";
-import { NextSeo } from "next-seo";
-
-import { AuthLayout } from "@/components/layouts/auth-layout";
-import { withPageTranslations } from "@/utils/with-page-translations";
-
-const Page = () => {
-  const { t } = useTranslation();
-  return (
-    <AuthLayout title={t("expiredOrInvalidLink")}>
-      <NextSeo
-        title={t("expiredOrInvalidLink")}
-        nofollow={true}
-        noindex={true}
-      />
-      {t("expiredOrInvalidLink")}
-    </AuthLayout>
-  );
-};
-
-export const getStaticProps = withPageTranslations();
-
-export default Page;

apps/web/src/pages/auth/login.tsx

@@ -1,57 +1,58 @@
-import { LoginTokenPayload } from "@rallly/backend";
-import {
-  composeGetServerSideProps,
-  withSessionSsr,
-} from "@rallly/backend/next";
-import { decryptToken } from "@rallly/backend/session";
-import { prisma } from "@rallly/database";
+import { trpc } from "@rallly/backend";
+import { withSessionSsr } from "@rallly/backend/next";
 import { CheckCircleIcon } from "@rallly/icons";
 import clsx from "clsx";
 import { GetServerSideProps } from "next";
 import Link from "next/link";
 import { useRouter } from "next/router";
 import { Trans, useTranslation } from "next-i18next";
-import React from "react";
+import { useMount } from "react-use";
 
 import { AuthLayout } from "@/components/layouts/auth-layout";
 import { Spinner } from "@/components/spinner";
+import { withSession } from "@/components/user-provider";
+import { usePostHog } from "@/utils/posthog";
 import { withPageTranslations } from "@/utils/with-page-translations";
 
 const defaultRedirectPath = "/profile";
 
-const redirectToInvalidToken = {
-  redirect: {
-    destination: "/auth/invalid-token",
-    permanent: false,
-  },
-};
-
-const Redirect = () => {
+export const Page = () => {
   const { t } = useTranslation();
-  const [enabled, setEnabled] = React.useState(false);
-  const router = useRouter();
 
-  React.useEffect(() => {
-    setTimeout(() => {
-      setEnabled(true);
-    }, 500);
+  const router = useRouter();
+  const { token } = router.query;
+  const posthog = usePostHog();
+  const authenticate = trpc.whoami.authenticate.useMutation();
+
+  useMount(() => {
+    authenticate.mutate(
+      { token: token as string },
+      {
+        onSuccess: (user) => {
+          posthog?.identify(user.id, {
+            name: user.name,
+            email: user.email,
+          });
+
           setTimeout(() => {
             router.replace(defaultRedirectPath);
-    }, 3000);
-  }, [router]);
+          }, 1000);
+        },
+      },
+    );
+  });
 
   return (
+    <AuthLayout title={t("login")}>
+      {authenticate.isLoading ? (
+        <div className="flex items-center gap-4">
+          <Spinner />
+          <Trans i18nKey="loading" />
+        </div>
+      ) : authenticate.isSuccess ? (
         <div className="space-y-2">
           <div className="flex h-10 items-center justify-center gap-4">
-        {enabled ? (
-          <CheckCircleIcon
-            className={clsx("animate-popIn h-8 text-green-500", {
-              "opacity-0": !enabled,
-            })}
-          />
-        ) : (
-          <Spinner />
-        )}
+            <CheckCircleIcon className={clsx("h-8 text-green-500")} />
           </div>
           <div className="text-slate-800">{t("loginSuccessful")}</div>
           <div className="text-sm text-slate-500">
@@ -64,75 +65,17 @@ const Redirect = () => {
             />
           </div>
         </div>
-  );
-};
-export const Page = (
-  props:
-    | {
-        success: true;
-        name: string;
-      }
-    | {
-        success: false;
-        errorCode: "userNotFound";
-      },
-) => {
-  const { t } = useTranslation();
-  return (
-    <AuthLayout title={t("login")}>
-      {props.success ? (
-        <Redirect />
       ) : (
-        <Trans t={t} i18nKey="userDoesNotExist" />
+        <div>
+          <Trans i18nKey="expiredOrInvalidLink" />
+        </div>
       )}
     </AuthLayout>
   );
 };
 
-export default Page;
+export default withSession(Page);
 
-export const getServerSideProps: GetServerSideProps = composeGetServerSideProps(
+export const getServerSideProps: GetServerSideProps = withSessionSsr(
   withPageTranslations(),
-  withSessionSsr(async (ctx) => {
-    const token = ctx.query.token as string;
-
-    if (!token) {
-      // token is missing
-      return redirectToInvalidToken;
-    }
-
-    const payload = await decryptToken<LoginTokenPayload>(token);
-
-    if (!payload) {
-      // token is invalid or expired
-      return redirectToInvalidToken;
-    }
-
-    const user = await prisma.user.findFirst({
-      select: {
-        id: true,
-      },
-      where: { id: payload.userId },
-    });
-
-    if (!user) {
-      // user does not exist
-      return {
-        props: {
-          success: false,
-          errorCode: "userNotFound",
-        },
-      };
-    }
-
-    ctx.req.session.user = { id: user.id, isGuest: false };
-
-    await ctx.req.session.save();
-
-    return {
-      props: {
-        success: true,
-      },
-    };
-  }),
 );

packages/backend/trpc/routers/whoami.ts

@@ -1,7 +1,10 @@
 import { prisma } from "@rallly/database";
+import { TRPCError } from "@trpc/server";
+import z from "zod";
 
+import { decryptToken } from "../../session";
 import { publicProcedure, router } from "../trpc";
-import { UserSession } from "../types";
+import { LoginTokenPayload, UserSession } from "../types";
 
 export const whoami = router({
   get: publicProcedure.query(async ({ ctx }): Promise<UserSession> => {
@@ -24,4 +27,34 @@ export const whoami = router({
   destroy: publicProcedure.mutation(async ({ ctx }) => {
     ctx.session.destroy();
   }),
+  authenticate: publicProcedure
+    .input(z.object({ token: z.string() }))
+    .mutation(async ({ ctx, input }) => {
+      const payload = await decryptToken<LoginTokenPayload>(input.token);
+
+      if (!payload) {
+        // token is invalid or expired
+        throw new TRPCError({ code: "PARSE_ERROR", message: "Invalid token" });
+      }
+
+      const user = await prisma.user.findFirst({
+        select: {
+          id: true,
+          name: true,
+          email: true,
+        },
+        where: { id: payload.userId },
+      });
+
+      if (!user) {
+        // user does not exist
+        throw new TRPCError({ code: "NOT_FOUND", message: "User not found" });
+      }
+
+      ctx.session.user = { id: user.id, isGuest: false };
+
+      await ctx.session.save();
+
+      return user;
+    }),
 });