makearmy-app/middleware.ts

// middleware.ts
import { NextResponse, NextRequest } from "next/server";

/**
 * Public pages that should remain reachable without being signed in.
 * Everything else is considered protected (including most /api/*).
 */
 const PUBLIC_PAGES = new Set<string>(["/auth/sign-in", "/auth/sign-up"]);

 /**
  * API paths that are explicitly allowed without auth.
  * Keep this list tiny. If you don't need any public APIs, leave it empty.
  */
 const PUBLIC_API_PREFIXES: string[] = [
     "/api/auth",      // login/refresh/callback endpoints
// "/api/health", // uncomment if you intentionally expose a healthcheck
 ];

 /** Helper: does the path start with any prefix in a list? */
 function startsWithAny(pathname: string, prefixes: string[]) {
     return prefixes.some((p) => pathname.startsWith(p));
 }

 /** Helper: are we about to redirect to the same URL? */
 function isSameUrl(req: NextRequest, mapped: MapResult) {
     const dest = new URL(req.url);
     dest.pathname = mapped.pathname;
     if (mapped.query) {
         for (const [k, v] of Object.entries(mapped.query)) dest.searchParams.set(k, v);
     }
     return dest.href === req.url;
 }

 export function middleware(req: NextRequest) {
     const url = req.nextUrl.clone();
     const { pathname } = url;

     // ── 1) Legacy → Portal / Canonical mapping (runs before auth gating)
     const mapped = legacyMap(pathname);
     if (mapped && !isSameUrl(req, mapped)) {
         url.pathname = mapped.pathname;
         if (mapped.query) {
             for (const [k, v] of Object.entries(mapped.query)) url.searchParams.set(k, v);
         }
         return NextResponse.redirect(url);
     }

     // ── 2) Auth gating (ma_at is the only allowed auth context)
     const token = req.cookies.get("ma_at")?.value ?? "";
     const isAuthRoute = pathname.startsWith("/auth/");

     // If signed in and visiting /auth/*, send to portal
     if (token && isAuthRoute) {
         url.pathname = "/portal";
         url.search = "";
         return NextResponse.redirect(url);
     }

     // If unauthenticated and the route is protected, send to sign-in
     if (!token && !isPublicPath(pathname)) {
         url.pathname = "/auth/sign-in";
         url.search = "";
         return NextResponse.redirect(url);
     }

     return NextResponse.next();
 }

 type MapResult = { pathname: string; query?: Record<string, string> };

 function legacyMap(pathname: string): MapResult | null {
     // If we’re already inside the portal, don’t try to remap again.
     if (pathname.startsWith("/portal")) return null;

     // 1) DETAIL PAGES: map legacy detail URLs straight into the portal with ?id=
     //    NOTE: We intentionally DO NOT remap `/lasers/:id` and `/projects/:id`
     //    so the portal iframes can load those canonical pages without recursion.
     const detailRules: Array<[RegExp, (m: RegExpExecArray) => MapResult]> = [
         // Laser settings
         [/^\/fiber-settings\/([^/]+)\/?$/i,      (m) => ({ pathname: "/portal/laser-settings", query: { t: "fiber",       id: m[1] } })],
         [/^\/uv-settings\/([^/]+)\/?$/i,         (m) => ({ pathname: "/portal/laser-settings", query: { t: "uv",          id: m[1] } })],
         [/^\/co2-galvo-settings\/([^/]+)\/?$/i,  (m) => ({ pathname: "/portal/laser-settings", query: { t: "co2-galvo",   id: m[1] } })],
         [/^\/co2-gantry-settings\/([^/]+)\/?$/i, (m) => ({ pathname: "/portal/laser-settings", query: { t: "co2-gantry",  id: m[1] } })],
         [/^\/co2gantry-settings\/([^/]+)\/?$/i,  (m) => ({ pathname: "/portal/laser-settings", query: { t: "co2-gantry",  id: m[1] } })],

         // Materials
         [/^\/materials\/([^/]+)\/?$/i,           (m) => ({ pathname: "/portal/materials",      query: { t: "materials",           id: m[1] } })],
         [/^\/materials-coatings\/([^/]+)\/?$/i,  (m) => ({ pathname: "/portal/materials",      query: { t: "materials-coatings",  id: m[1] } })],
     ];
     for (const [re, to] of detailRules) {
         const m = re.exec(pathname);
         if (m) return to(m);
     }

     // 2) LIST PAGES: legacy lists → portal lists (with tab param) or sections
     const listRules: Array<[RegExp, MapResult]> = [
         // Laser settings lists
         [/^\/fiber-settings\/?$/i,         { pathname: "/portal/laser-settings", query: { t: "fiber" } }],
         [/^\/uv-settings\/?$/i,            { pathname: "/portal/laser-settings", query: { t: "uv" } }],
         [/^\/co2-galvo-settings\/?$/i,     { pathname: "/portal/laser-settings", query: { t: "co2-galvo" } }],
         [/^\/co2-ganry-settings\/?$/i,     { pathname: "/portal/laser-settings", query: { t: "co2-gantry" } }], // typo catch
         [/^\/co2-gantry-settings\/?$/i,    { pathname: "/portal/laser-settings", query: { t: "co2-gantry" } }],
         [/^\/co2gantry-settings\/?$/i,     { pathname: "/portal/laser-settings", query: { t: "co2-gantry" } }], // old alias

         // Materials lists
         [/^\/materials\/?$/i,              { pathname: "/portal/materials",      query: { t: "materials" } }],
         [/^\/materials\/materials\/?$/i,   { pathname: "/portal/materials",      query: { t: "materials" } }],
         [/^\/materials\/materials-coatings\/?$/i, { pathname: "/portal/materials", query: { t: "materials-coatings" } }],
         [/^\/materials-coatings\/?$/i,     { pathname: "/portal/materials",      query: { t: "materials-coatings" } }],

         // Other lists
         [/^\/lasers\/?$/i,                 { pathname: "/portal/laser-sources" }],
         [/^\/projects\/?$/i,               { pathname: "/portal/projects" }],
         [/^\/my\/rigs\/?$/i,               { pathname: "/portal/rigs",           query: { t: "my" } }],
     ];
     for (const [re, dest] of listRules) {
         if (re.test(pathname)) return dest;
     }

     return null;
 }

 function isPublicPath(pathname: string): boolean {
     // 1) Public pages (auth screens)
     if (PUBLIC_PAGES.has(pathname)) return true;

     // 2) Static assets / internals
     if (
         pathname.startsWith("/_next/") ||
         pathname.startsWith("/static/") ||
         pathname.startsWith("/images/") ||
         pathname === "/favicon.ico" ||
         pathname === "/robots.txt" ||
         pathname === "/sitemap.xml"
     ) {
         return true;
     }

     // 3) APIs:
     //    By default, /api/* is PROTECTED.
     //    Only allow specific public API prefixes listed above.
     if (pathname.startsWith("/api/")) {
         return startsWithAny(pathname, PUBLIC_API_PREFIXES);
     }

     // 4) Everything else is protected
     return false;
 }

 export const config = {
     matcher: ["/((?!_next/static|_next/image|favicon.ico|robots.txt|sitemap.xml|images|static).*)"],
 };