Trader Launchpad•10mo ago

Thoughts on how to integrate t3 app, connectkit web3 auth, nextjs middleware, and trpc

I am prototyping an application using t3 app with trpc, connectkit web3 auth. I am wanting to use nextjs middleware to protect routes server side. As part of the connectkit auth flow, I have my application wrapped in a ClientProvider:

// layout.tsx
 <body
        className={`font-sans ${inter.variable} flex min-h-screen flex-1 items-center justify-center bg-gradient-to-b from-[#2e026d] to-[#15162c] text-white`}
      >
        <TRPCReactProvider headers={headers()}>
          <ClientProvider>{children}</ClientProvider>
        </TRPCReactProvider>
      </body>

// layout.tsx
 <body
        className={`font-sans ${inter.variable} flex min-h-screen flex-1 items-center justify-center bg-gradient-to-b from-[#2e026d] to-[#15162c] text-white`}
      >
        <TRPCReactProvider headers={headers()}>
          <ClientProvider>{children}</ClientProvider>
        </TRPCReactProvider>
      </body>

Inside ClientProvider I have the web3 providers:

// ClientProvider.tsx
...
return (
    <WagmiConfig config={config}>
      <SIWEProvider {...siweConfig} onSignIn={() => router.push("/")}>
        <ConnectKitProvider>{children}</ConnectKitProvider>
      </SIWEProvider>
    </WagmiConfig>
  );

// ClientProvider.tsx
...
return (
    <WagmiConfig config={config}>
      <SIWEProvider {...siweConfig} onSignIn={() => router.push("/")}>
        <ConnectKitProvider>{children}</ConnectKitProvider>
      </SIWEProvider>
    </WagmiConfig>
  );

and here is const siwiConfig. It calls the /siwe route on initial load and sets a cookie using iron-session with the nonce inside, then updates that same cookie after authentiucation with wallet address and chain:

1 Reply

Trader LaunchpadOP•10mo ago

const siweConfig = {
  getNonce: async () => {
    const res = await fetch(`/siwe`, { method: "PUT" });
    if (!res.ok) throw new Error("Failed to fetch SIWE nonce");

    return res.text();
  },
  createMessage: ({ nonce, address, chainId }) => {
    return new SiweMessage({
      nonce,
      chainId,
      address,
      version: "1",
      uri: window.location.origin,
      domain: window.location.host,
      statement: "Sign In With Ethereum to prove you control this wallet.",
    }).prepareMessage();
  },
  verifyMessage: ({ message, signature }) => {
    return fetch(`/siwe`, {
      method: "POST",
      body: JSON.stringify({ message, signature }),
      headers: { "Content-Type": "application/json" },
    }).then((res) => res.ok);
  },
  getSession: async () => {
    const res = await fetch(`/siwe`);
    if (!res.ok) throw new Error("Failed to fetch SIWE session");

    const { address, chainId } = await res.json();
    return address && chainId ? { address, chainId } : null;
  },
  signOut: () => fetch(`/siwe`, { method: "DELETE" }).then((res) => res.ok),
} satisfies SIWEConfig;

const siweConfig = {
  getNonce: async () => {
    const res = await fetch(`/siwe`, { method: "PUT" });
    if (!res.ok) throw new Error("Failed to fetch SIWE nonce");

    return res.text();
  },
  createMessage: ({ nonce, address, chainId }) => {
    return new SiweMessage({
      nonce,
      chainId,
      address,
      version: "1",
      uri: window.location.origin,
      domain: window.location.host,
      statement: "Sign In With Ethereum to prove you control this wallet.",
    }).prepareMessage();
  },
  verifyMessage: ({ message, signature }) => {
    return fetch(`/siwe`, {
      method: "POST",
      body: JSON.stringify({ message, signature }),
      headers: { "Content-Type": "application/json" },
    }).then((res) => res.ok);
  },
  getSession: async () => {
    const res = await fetch(`/siwe`);
    if (!res.ok) throw new Error("Failed to fetch SIWE session");

    const { address, chainId } = await res.json();
    return address && chainId ? { address, chainId } : null;
  },
  signOut: () => fetch(`/siwe`, { method: "DELETE" }).then((res) => res.ok),
} satisfies SIWEConfig;

Then i have setup a custom nextjs middleware that checks the cookie, and redirects based on authenticated or unauthenticated status:

const PUBLIC_PATHS = ["/register", "/login", "/reset-password", "/siwe"];
...
const session = await Session.fromRequest(request);
 if (session.address) {
    // User is authenticated
    console.log("Authenticated");
    if (isPublicPath) {
      // Redirect authenticated users away from public paths to the home page
      url.pathname = "/";
      return NextResponse.redirect(url);
    }
...
export const config = {
  matcher: ["/((?!_next/static|_next/image|favicon.ico).*)"],
};

const PUBLIC_PATHS = ["/register", "/login", "/reset-password", "/siwe"];
...
const session = await Session.fromRequest(request);
 if (session.address) {
    // User is authenticated
    console.log("Authenticated");
    if (isPublicPath) {
      // Redirect authenticated users away from public paths to the home page
      url.pathname = "/";
      return NextResponse.redirect(url);
    }
...
export const config = {
  matcher: ["/((?!_next/static|_next/image|favicon.ico).*)"],
};

The matcher is stock from nextjs documentation, and it runs on every route including /api and trpc calls. When I have this middleware enabled I am getting an error on the front page of t3 app, on the standard post.hello trpc call:

RequestContentLengthMismatchError: Request body length does not match content-length header

RequestContentLengthMismatchError: Request body length does not match content-length header

When I disable the middleware, this issue goes away. I believe it is due to my nextjs middleware matcher running on every request, and blocking /siwe as a publicpath if they ARE authenticated, sending them to / and something is getitng lost on the trpc side. To clarify on a page reload the middleware is hit multiple times, once on "/", once on "/siwe" which is triggered every page reload by the ClientProvider. The error only happens on the call that originated from "/siwe" Strangely if I simply move /siwe to /api/siwe, the error goes away. Also if I remove the

if (isPublicPath) {

if (isPublicPath) {

logic the error goes away. What is the correct way to setup the nextjs middleware in this situation? Should I just add /siwe as an ignored route in the middleware matcher? Should i be putting my /siwe logic in trpc routes and calling it that way (api.user.getNonce, api.user.verifyNonce. api.user.createSession, ect)?