Create Web3 nonce endpoint

cgen-718fe01d038a420c9b60c4935e318661

api/web3/nonce.ts

@@ -0,0 +1,49 @@
+import type { VercelRequest, VercelResponse } from "@vercel/node";
+import { createClient } from "@supabase/supabase-js";
+import { randomBytes } from "crypto";
+
+const supabase = createClient(
+  process.env.SUPABASE_URL || "",
+  process.env.SUPABASE_SERVICE_ROLE || "",
+);
+
+export default async function handler(req: VercelRequest, res: VercelResponse) {
+  if (req.method !== "POST") {
+    res.setHeader("Allow", "POST");
+    return res.status(405).json({ error: "Method not allowed" });
+  }
+
+  try {
+    const { wallet_address } = req.body;
+
+    if (!wallet_address || !wallet_address.match(/^0x[a-fA-F0-9]{40}$/)) {
+      return res.status(400).json({ error: "Invalid wallet address" });
+    }
+
+    const normalizedAddress = wallet_address.toLowerCase();
+
+    // Generate a random nonce
+    const nonce = randomBytes(16).toString("hex");
+    const expiresAt = new Date(Date.now() + 15 * 60 * 1000); // 15 minutes
+
+    // Store nonce in database
+    const { error } = await supabase.from("web3_nonces").insert({
+      wallet_address: normalizedAddress,
+      nonce,
+      expires_at: expiresAt.toISOString(),
+      created_at: new Date().toISOString(),
+    });
+
+    if (error) {
+      console.error("Failed to store nonce:", error);
+      return res.status(500).json({ error: "Failed to generate nonce" });
+    }
+
+    return res.status(200).json({ nonce });
+  } catch (error: any) {
+    console.error("Nonce generation error:", error);
+    return res.status(500).json({
+      error: error?.message || "Failed to generate nonce",
+    });
+  }
+}