fix: add email confirmation screen and auth callback redirect (#208)

e2e/auth.spec.ts

@@ -19,6 +19,30 @@ test.describe("Authentication", () => {
     await expect(page.getByRole("button", { name: /sign up/i })).toBeVisible();
   });
 
+  test("sign-in page shows confirmation message with confirmed=true param", async ({
+    page,
+  }) => {
+    await page.goto("/sign-in?confirmed=true");
+    await expect(
+      page.getByText(/email confirmed/i),
+    ).toBeVisible();
+  });
+
+  test("sign-in page does not show confirmation message without param", async ({
+    page,
+  }) => {
+    await page.goto("/sign-in");
+    await expect(
+      page.getByText(/email confirmed/i),
+    ).not.toBeVisible();
+  });
+
+  test("auth callback redirects to sign-in without code", async ({ page }) => {
+    await page.goto("/auth/callback");
+    await page.waitForURL(/sign-in/, { timeout: 10_000 });
+    expect(page.url()).toContain("/sign-in");
+  });
+
   test("unauthenticated user is redirected to sign-in", async ({ page }) => {
     // Try to access an authenticated route
     await page.goto("/test-workspace");

src/app/(auth)/sign-in/page.test.tsx

@@ -5,8 +5,10 @@ import userEvent from "@testing-library/user-event";
 
 // Mock next/navigation
 const mockPush = vi.fn();
+let mockSearchParams = new URLSearchParams();
 vi.mock("next/navigation", () => ({
   useRouter: () => ({ push: mockPush }),
+  useSearchParams: () => mockSearchParams,
 }));
 
 // Mock next/link as a simple anchor
@@ -49,6 +51,7 @@ import SignInPage from "./page";
 
 beforeEach(() => {
   vi.clearAllMocks();
+  mockSearchParams = new URLSearchParams();
 });
 
 describe("SignInPage", () => {
@@ -207,4 +210,21 @@ describe("SignInPage", () => {
       ).toBeDisabled();
     });
   });
+
+  it("shows confirmation success message when confirmed=true query param is present", () => {
+    mockSearchParams = new URLSearchParams("confirmed=true");
+    render(<SignInPage />);
+
+    expect(
+      screen.getByText(/email confirmed/i),
+    ).toBeInTheDocument();
+  });
+
+  it("does not show confirmation message without query param", () => {
+    render(<SignInPage />);
+
+    expect(
+      screen.queryByText(/email confirmed/i),
+    ).not.toBeInTheDocument();
+  });
 });

src/app/(auth)/sign-in/page.tsx

@@ -1,7 +1,7 @@
 "use client";
 
-import { useState } from "react";
-import { useRouter } from "next/navigation";
+import { Suspense, useState } from "react";
+import { useRouter, useSearchParams } from "next/navigation";
 import Link from "next/link";
 import { createClient } from "@/lib/supabase/client";
 import { Button } from "@/components/ui/button";
@@ -16,8 +16,10 @@ import {
 } from "@/components/ui/card";
 import { OAuthButtons } from "@/components/auth/oauth-buttons";
 
-export default function SignInPage() {
+function SignInForm() {
   const router = useRouter();
+  const searchParams = useSearchParams();
+  const confirmed = searchParams.get("confirmed") === "true";
   const [email, setEmail] = useState("");
   const [password, setPassword] = useState("");
   const [error, setError] = useState<string | null>(null);
@@ -99,6 +101,11 @@ export default function SignInPage() {
               minLength={6}
             />
           </div>
+          {confirmed && (
+            <p className="text-xs text-accent">
+              Email confirmed — you can now sign in.
+            </p>
+          )}
           {error && <p className="text-xs text-destructive">{error}</p>}
           <Button type="submit" disabled={loading} className="mt-1">
             {loading ? "Signing in…" : "Sign in"}
@@ -123,3 +130,11 @@ export default function SignInPage() {
     </Card>
   );
 }
+
+export default function SignInPage() {
+  return (
+    <Suspense>
+      <SignInForm />
+    </Suspense>
+  );
+}

src/app/(auth)/sign-up/page.test.tsx

@@ -104,9 +104,9 @@ describe("SignUpPage", () => {
     });
   });
 
-  it("calls supabase.auth.signUp with correct parameters", async () => {
+  it("calls supabase.auth.signUp with correct parameters including emailRedirectTo", async () => {
     mockSignUp.mockResolvedValue({
-      data: { user: { id: "user-1" } },
+      data: { user: { id: "user-1", identities: [{ id: "id-1" }] } },
       error: null,
     });
 
@@ -137,14 +137,43 @@ describe("SignUpPage", () => {
           data: {
             display_name: "Jane Doe",
           },
+          emailRedirectTo: "http://localhost:3000/auth/callback",
         },
       });
     });
   });
 
-  it("redirects to workspace after successful sign-up", async () => {
+  it("shows confirmation screen when email confirmation is required", async () => {
     mockSignUp.mockResolvedValue({
-      data: { user: { id: "user-1" } },
+      data: { user: { id: "user-1", identities: [] } },
+      error: null,
+    });
+
+    const user = userEvent.setup();
+    render(<SignUpPage />);
+
+    await user.type(screen.getByLabelText("Display name"), "Jane Doe");
+    await user.type(screen.getByLabelText("Email"), "jane@example.com");
+    await user.type(screen.getByLabelText("Password"), "password123");
+
+    const form = screen.getByRole("button", { name: /sign up/i })
+      .closest("form")!;
+    form.requestSubmit();
+
+    await waitFor(() => {
+      expect(screen.getByText("Check your inbox")).toBeInTheDocument();
+      expect(screen.getByText("jane@example.com")).toBeInTheDocument();
+    });
+
+    // Form should no longer be visible
+    expect(screen.queryByLabelText("Email")).not.toBeInTheDocument();
+    // Should not have attempted a redirect
+    expect(mockPush).not.toHaveBeenCalled();
+  });
+
+  it("redirects to workspace after successful sign-up without email confirmation", async () => {
+    mockSignUp.mockResolvedValue({
+      data: { user: { id: "user-1", identities: [{ id: "id-1" }] } },
       error: null,
     });
 
@@ -174,7 +203,7 @@ describe("SignUpPage", () => {
 
   it("redirects to root when no workspace found after sign-up", async () => {
     mockSignUp.mockResolvedValue({
-      data: { user: { id: "user-1" } },
+      data: { user: { id: "user-1", identities: [{ id: "id-1" }] } },
       error: null,
     });
 

src/app/(auth)/sign-up/page.tsx

@@ -23,20 +23,24 @@ export default function SignUpPage() {
   const [password, setPassword] = useState("");
   const [error, setError] = useState<string | null>(null);
   const [loading, setLoading] = useState(false);
+  const [confirmationPending, setConfirmationPending] = useState(false);
 
   async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
     e.preventDefault();
     setError(null);
     setLoading(true);
 
     const supabase = createClient();
+    const siteUrl =
+      typeof window !== "undefined" ? window.location.origin : "";
     const { data, error: signUpError } = await supabase.auth.signUp({
       email,
       password,
       options: {
         data: {
           display_name: displayName,
         },
+        emailRedirectTo: `${siteUrl}/auth/callback`,
       },
     });
 
@@ -46,8 +50,20 @@ export default function SignUpPage() {
       return;
     }
 
-    // After sign-up, the handle_new_user trigger creates a personal workspace.
-    // Fetch it so we can redirect there.
+    // When email confirmation is required, Supabase returns a user with
+    // an empty identities array. Show the confirmation screen instead of
+    // attempting to redirect.
+    if (
+      data.user &&
+      (!data.user.identities || data.user.identities.length === 0)
+    ) {
+      setConfirmationPending(true);
+      setLoading(false);
+      return;
+    }
+
+    // If email confirmation is disabled, the user is immediately active.
+    // Fetch their workspace and redirect.
     if (data.user) {
       const { data: membership } = await supabase
         .from("members")
@@ -67,6 +83,34 @@ export default function SignUpPage() {
     router.push("/");
   }
 
+  if (confirmationPending) {
+    return (
+      <Card>
+        <CardHeader>
+          <CardTitle className="text-2xl font-semibold">
+            Check your inbox
+          </CardTitle>
+          <CardDescription>
+            We sent a confirmation link to{" "}
+            <span className="font-medium text-foreground">{email}</span>.
+            Click the link to activate your account.
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <p className="text-xs text-muted-foreground">
+            Already confirmed?{" "}
+            <Link
+              href="/sign-in"
+              className="text-accent underline-offset-4 hover:underline"
+            >
+              Sign in
+            </Link>
+          </p>
+        </CardContent>
+      </Card>
+    );
+  }
+
   return (
     <Card>
       <CardHeader>

src/app/auth/callback/route.test.ts

@@ -0,0 +1,69 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { NextRequest } from "next/server";
+
+const mockExchangeCodeForSession = vi.fn();
+const mockSignOut = vi.fn();
+
+vi.mock("@/lib/supabase/server", () => ({
+  createClient: vi.fn().mockResolvedValue({
+    auth: {
+      exchangeCodeForSession: (...args: unknown[]) =>
+        mockExchangeCodeForSession(...args),
+      signOut: (...args: unknown[]) => mockSignOut(...args),
+    },
+  }),
+}));
+
+import { GET } from "./route";
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+describe("GET /auth/callback", () => {
+  it("exchanges code for session and redirects to sign-in with confirmed=true", async () => {
+    mockExchangeCodeForSession.mockResolvedValue({ error: null });
+    mockSignOut.mockResolvedValue({ error: null });
+
+    const request = new NextRequest(
+      "http://localhost:3000/auth/callback?code=test-auth-code",
+    );
+    const response = await GET(request);
+
+    expect(mockExchangeCodeForSession).toHaveBeenCalledWith("test-auth-code");
+    expect(mockSignOut).toHaveBeenCalled();
+    expect(response.status).toBe(307);
+    expect(response.headers.get("location")).toBe(
+      "http://localhost:3000/sign-in?confirmed=true",
+    );
+  });
+
+  it("redirects to sign-in without confirmed param when code exchange fails", async () => {
+    mockExchangeCodeForSession.mockResolvedValue({
+      error: { message: "Invalid code" },
+    });
+
+    const request = new NextRequest(
+      "http://localhost:3000/auth/callback?code=bad-code",
+    );
+    const response = await GET(request);
+
+    expect(mockExchangeCodeForSession).toHaveBeenCalledWith("bad-code");
+    expect(mockSignOut).not.toHaveBeenCalled();
+    expect(response.status).toBe(307);
+    expect(response.headers.get("location")).toBe(
+      "http://localhost:3000/sign-in",
+    );
+  });
+
+  it("redirects to sign-in when no code param is provided", async () => {
+    const request = new NextRequest("http://localhost:3000/auth/callback");
+    const response = await GET(request);
+
+    expect(mockExchangeCodeForSession).not.toHaveBeenCalled();
+    expect(response.status).toBe(307);
+    expect(response.headers.get("location")).toBe(
+      "http://localhost:3000/sign-in",
+    );
+  });
+});

src/app/auth/callback/route.ts

@@ -0,0 +1,30 @@
+import { NextResponse, type NextRequest } from "next/server";
+import { createClient } from "@/lib/supabase/server";
+
+/**
+ * Handles the email confirmation redirect from Supabase Auth.
+ * Supabase appends `?code=<auth_code>` to the callback URL.
+ * This route exchanges the code for a session, then redirects
+ * the user to the sign-in page with a confirmed=true param.
+ */
+export async function GET(request: NextRequest) {
+  const { searchParams, origin } = request.nextUrl;
+  const code = searchParams.get("code");
+
+  if (code) {
+    const supabase = await createClient();
+    const { error } = await supabase.auth.exchangeCodeForSession(code);
+
+    if (!error) {
+      // Sign the user out so they land on the sign-in page with a fresh
+      // session prompt. The confirmation was successful — they can now
+      // sign in with their credentials.
+      await supabase.auth.signOut();
+      return NextResponse.redirect(`${origin}/sign-in?confirmed=true`);
+    }
+  }
+
+  // If the code is missing or exchange failed, redirect to sign-in
+  // without the success message so the user can try again.
+  return NextResponse.redirect(`${origin}/sign-in`);
+}

src/lib/supabase/proxy.ts

@@ -2,7 +2,7 @@ import { createServerClient } from "@supabase/ssr";
 import { NextResponse, type NextRequest } from "next/server";
 
 // Routes that unauthenticated users can access
-const PUBLIC_ROUTES = ["/sign-in", "/sign-up", "/invite"];
+const PUBLIC_ROUTES = ["/sign-in", "/sign-up", "/invite", "/auth/callback"];
 
 export async function updateSession(request: NextRequest) {
   let supabaseResponse = NextResponse.next({ request });