Refactor authentication flow; improve error handling, implement token creation and verification, and enhance user session management. Fixed login issue. Currently working on user authorisation for creating teams.

app/auth/[...nextauth]/token.js

@@ -0,0 +1,36 @@
+const NEXTAUTH_SECRET = "banana";
+
+// Function to create a signed token
+export function createToken(payload) {
+  const encodedData = Buffer.from(JSON.stringify(payload)).toString("base64");
+  const signature = Buffer.from(`${encodedData}.${NEXTAUTH_SECRET}`).toString(
+    "base64"
+  );
+  return `${encodedData}.${signature}`;
+}
+
+// Function to verify a token
+export function verifyToken(token) {
+  try {
+    if (!token) return null;
+
+    const [encodedData, signature] = token.split(".");
+    const expectedSignature = Buffer.from(
+      `${encodedData}.${NEXTAUTH_SECRET}`
+    ).toString("base64");
+
+    if (signature !== expectedSignature) return null;
+
+    const data = JSON.parse(
+      Buffer.from(encodedData, "base64").toString("utf-8")
+    );
+
+    // Check if token is expired
+    if (data.exp && data.exp < Math.floor(Date.now() / 1000)) return null;
+
+    return data;
+  } catch (error) {
+    console.error("Token verification error:", error);
+    return null;
+  }
+}