Add signer creation

src/app/api/auth/nonce/route.ts

@@ -2,9 +2,15 @@ import { NextResponse } from 'next/server';
 import { getNeynarClient } from '~/lib/neynar';
 
 export async function GET() {
-  const client = getNeynarClient();
-
-  const response = await client.fetchNonce();
-
-  return NextResponse.json(response);
+  try {
+    const client = getNeynarClient();
+    const response = await client.fetchNonce();
+    return NextResponse.json(response);
+  } catch (error) {
+    console.error('Error fetching nonce:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch nonce' },
+      { status: 500 }
+    );
+  }
 }

src/app/api/auth/signer/route.ts

@@ -1,39 +1,42 @@
 import { NextResponse } from 'next/server';
 import { getNeynarClient } from '~/lib/neynar';
 
+export async function POST() {
+  try {
+    const neynarClient = getNeynarClient();
+    const signer = await neynarClient.createSigner();
+    return NextResponse.json(signer);
+  } catch (error) {
+    console.error('Error fetching signer:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch signer' },
+      { status: 500 }
+    );
+  }
+}
+
 export async function GET(request: Request) {
   const { searchParams } = new URL(request.url);
-  const message = searchParams.get('message');
-  const signature = searchParams.get('signature');
+  const signerUuid = searchParams.get('signerUuid');
 
-  if (!message) {
+  if (!signerUuid) {
     return NextResponse.json(
-      { error: 'Message parameter is required' },
+      { error: 'signerUuid is required' },
       { status: 400 }
     );
   }
 
-  if (!signature) {
-    return NextResponse.json(
-      { error: 'Signature parameter is required' },
-      { status: 400 }
-    );
-  }
-
-  const client = getNeynarClient();
-
-  let signers;
-
   try {
-    const data = await client.fetchSigners({ message, signature });
-    signers = data.signers;
+    const neynarClient = getNeynarClient();
+    const signer = await neynarClient.lookupSigner({
+      signerUuid,
+    });
+    return NextResponse.json(signer);
   } catch (error) {
-    console.error('Error fetching signers:', error?.response?.data);
-    throw new Error('Failed to fetch signers');
+    console.error('Error fetching signed key:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch signed key' },
+      { status: 500 }
+    );
   }
-  console.log('signers =>', signers);
-
-  return NextResponse.json({
-    signers,
-  });
 }

src/app/api/auth/signer/signed_key/route.ts

@@ -0,0 +1,101 @@
+import { NextResponse } from 'next/server';
+import { getNeynarClient } from '~/lib/neynar';
+import { mnemonicToAccount } from 'viem/accounts';
+
+const postRequiredFields = ['signerUuid', 'publicKey'];
+
+const SIGNED_KEY_REQUEST_VALIDATOR_EIP_712_DOMAIN = {
+  name: 'Farcaster SignedKeyRequestValidator',
+  version: '1',
+  chainId: 10,
+  verifyingContract:
+    '0x00000000fc700472606ed4fa22623acf62c60553' as `0x${string}`,
+};
+
+const SIGNED_KEY_REQUEST_TYPE = [
+  { name: 'requestFid', type: 'uint256' },
+  { name: 'key', type: 'bytes' },
+  { name: 'deadline', type: 'uint256' },
+];
+
+export async function POST(request: Request) {
+  const body = await request.json();
+
+  // Validate required fields
+  for (const field of postRequiredFields) {
+    if (!body[field]) {
+      return NextResponse.json(
+        { error: `${field} is required` },
+        { status: 400 }
+      );
+    }
+  }
+
+  const { signerUuid, publicKey, redirectUrl } = body;
+
+  if (redirectUrl && typeof redirectUrl !== 'string') {
+    return NextResponse.json(
+      { error: 'redirectUrl must be a string' },
+      { status: 400 }
+    );
+  }
+
+  try {
+    // Get the app's account from seed phrase
+    const seedPhrase = process.env.SEED_PHRASE;
+    const shouldSponsor = process.env.SPONSOR_SIGNER === 'true';
+
+    if (!seedPhrase) {
+      return NextResponse.json(
+        { error: 'App configuration missing (SEED_PHRASE or FID)' },
+        { status: 500 }
+      );
+    }
+
+    const neynarClient = getNeynarClient();
+
+    const account = mnemonicToAccount(seedPhrase);
+
+    const {
+      user: { fid },
+    } = await neynarClient.lookupUserByCustodyAddress({
+      custodyAddress: account.address,
+    });
+
+    const appFid = fid;
+
+    // Generate deadline (24 hours from now)
+    const deadline = Math.floor(Date.now() / 1000) + 86400;
+
+    // Generate EIP-712 signature
+    const signature = await account.signTypedData({
+      domain: SIGNED_KEY_REQUEST_VALIDATOR_EIP_712_DOMAIN,
+      types: {
+        SignedKeyRequest: SIGNED_KEY_REQUEST_TYPE,
+      },
+      primaryType: 'SignedKeyRequest',
+      message: {
+        requestFid: BigInt(appFid),
+        key: publicKey,
+        deadline: BigInt(deadline),
+      },
+    });
+
+    const signer = await neynarClient.registerSignedKey({
+      appFid,
+      deadline,
+      signature,
+      signerUuid,
+      ...(redirectUrl && { redirectUrl }),
+      ...(shouldSponsor && { sponsor: { sponsored_by_neynar: true } }),
+    });
+
+    return NextResponse.json(signer);
+  } catch (error) {
+    console.error('Error registering signed key:', error);
+    return NextResponse.json(
+      { error: 'Failed to register signed key' },
+      { status: 500 }
+    );
+  }
+}

src/app/api/auth/signers/route.ts

@@ -0,0 +1,38 @@
+import { NextResponse } from 'next/server';
+import { getNeynarClient } from '~/lib/neynar';
+
+const requiredParams = ['message', 'signature'];
+
+export async function GET(request: Request) {
+  const { searchParams } = new URL(request.url);
+  const params: Record<string, string | null> = {};
+  for (const param of requiredParams) {
+    params[param] = searchParams.get(param);
+    if (!params[param]) {
+      return NextResponse.json(
+        {
+          error: `${param} parameter is required`,
+        },
+        { status: 400 }
+      );
+    }
+  }
+
+  const message = params.message as string;
+  const signature = params.signature as string;
+
+  try {
+    const client = getNeynarClient();
+    const data = await client.fetchSigners({ message, signature });
+    const signers = data.signers;
+    return NextResponse.json({
+      signers,
+    });
+  } catch (error) {
+    console.error('Error fetching signers:', error);
+    return NextResponse.json(
+      { error: 'Failed to fetch signers' },
+      { status: 500 }
+    );
+  }
+}