refactor: Enhance cookie handling and error management in authentication

- Updated `proxy.ts` to explicitly define cookie names based on the request protocol, improving clarity in cookie management.
- Refactored `auth.ts` to always throw an error for missing `NEXTAUTH_SECRET` at runtime, ensuring critical configuration is validated consistently.

lib/auth.ts

@@ -9,14 +9,9 @@ import { logger } from "./logger"
 function getNextAuthSecret(): string {
   const secret = process.env.NEXTAUTH_SECRET
   if (!secret) {
-    // Only throw in non-build contexts (runtime)
+    // Always throw at runtime - this is a critical configuration error
-    // During build, Next.js might not have env vars available
-    if (process.env.NEXT_PHASE !== "phase-production-build") {
     throw new Error("NEXTAUTH_SECRET is not set. Define it to enable authentication.")
   }
-    // Return a placeholder during build - will fail at runtime if not set
-    return "build-time-placeholder"
-  }
   return secret
 }
 

proxy.ts

@@ -13,12 +13,14 @@ export async function proxy(request: NextRequest) {
 
   // Get token (works in Edge runtime)
   // For HTTPS, NextAuth adds __Secure- prefix automatically
-  // Don't specify cookieName - let getToken auto-detect the correct cookie name
+  // getToken should handle the prefix, but we specify the base name
-  // It will automatically look for both prefixed and non-prefixed versions
+  const isHttps = request.url.startsWith("https://")
+  const cookieName = isHttps ? `__Secure-authjs.session-token` : `authjs.session-token`
+  
   const token = await getToken({ 
     req: request,
     secret: process.env.NEXTAUTH_SECRET,
-    // Don't specify cookieName - getToken will auto-detect __Secure- prefix for HTTPS
+    cookieName: cookieName,
   })
   
   // User activity logging - track all page visits and API calls