| 1 | import { NextRequest, NextResponse } from "next/server"; |
| 2 | import { detectLocaleFromHeaders } from "@/lib/i18n/detect"; |
| 3 | import { pathLocale, replacePathLocale } from "@/lib/i18n/path"; |
| 4 | import { |
| 5 | canonicalPublicAuthPath, |
| 6 | publicAuthCallbackDestination, |
| 7 | } from "@/lib/public-auth-routes"; |
| 8 | |
| 9 | const COOKIE = "NEXT_LOCALE"; |
| 10 | |
| 11 | const SECURITY_HEADERS: Record<string, string> = { |
| 12 | "X-Frame-Options": "DENY", |
| 13 | "X-Content-Type-Options": "nosniff", |
| 14 | "Referrer-Policy": "strict-origin-when-cross-origin", |
| 15 | "Permissions-Policy": "camera=(), microphone=(), geolocation=(), interest-cohort=()", |
| 16 | "Strict-Transport-Security": "max-age=63072000; includeSubDomains; preload", |
| 17 | }; |
| 18 | |
| 19 | function applySecurityHeaders(res: NextResponse): NextResponse { |
| 20 | for (const [k, v] of Object.entries(SECURITY_HEADERS)) res.headers.set(k, v); |
| 21 | return res; |
| 22 | } |
| 23 | |
| 24 | /** |
| 25 | * The one host this site is indexed under. `www` is also bound to this worker |
| 26 | * as a custom domain, so without this guard the entire site answers on two |
| 27 | * hosts and every page has a duplicate URL a crawler can reach. |
| 28 | * |
| 29 | * This runs before the locale and static-asset branches on purpose: the |
| 30 | * canonical host has to win for assets and API routes too, or a `www` page |
| 31 | * keeps pulling subresources from `www` after the document moved. |
| 32 | */ |
| 33 | const CANONICAL_HOST = "codewhale.net"; |
| 34 | |
| 35 | function canonicalHostRedirect(req: NextRequest): NextResponse | null { |
| 36 | const host = req.headers.get("host"); |
| 37 | if (!host) return null; |
| 38 | // Compare without the port so local and preview hosts are untouched. |
| 39 | const bare = host.split(":")[0].toLowerCase(); |
| 40 | if (bare !== `www.${CANONICAL_HOST}`) return null; |
| 41 | const url = req.nextUrl.clone(); |
| 42 | url.host = CANONICAL_HOST; |
| 43 | url.port = ""; |
| 44 | return NextResponse.redirect(url, 301); |
| 45 | } |
| 46 | |
| 47 | export function middleware(req: NextRequest) { |
| 48 | const { pathname } = req.nextUrl; |
| 49 | |
| 50 | const canonical = canonicalHostRedirect(req); |
| 51 | if (canonical) return applySecurityHeaders(canonical); |
| 52 | |
| 53 | // Skip API routes, static files, _next, and the dot-less metadata route |
| 54 | // for the shared OG image (but still apply security headers). |
| 55 | if ( |
| 56 | pathname.startsWith("/api/") || |
| 57 | pathname.startsWith("/_next/") || |
| 58 | pathname === "/opengraph-image" || |
| 59 | pathname.includes(".") |
| 60 | ) { |
| 61 | return applySecurityHeaders(NextResponse.next()); |
| 62 | } |
| 63 | |
| 64 | // Auth callbacks belong on the CWC app. Locale-prefixing them produced |
| 65 | // `/en/auth/callback` 404s (#5767). Preserve the query string. |
| 66 | const callback = publicAuthCallbackDestination(req.nextUrl); |
| 67 | if (callback) { |
| 68 | return applySecurityHeaders(NextResponse.redirect(callback, 307)); |
| 69 | } |
| 70 | |
| 71 | // `/login` and `/register` are aliases for the public sign-in / create-account |
| 72 | // pages. Fold them before locale detection so `/login` becomes `/en/signin` |
| 73 | // instead of `/en/login` (which has no page). |
| 74 | const canonicalAuth = canonicalPublicAuthPath(pathname); |
| 75 | if (canonicalAuth && canonicalAuth !== pathname) { |
| 76 | const url = req.nextUrl.clone(); |
| 77 | url.pathname = canonicalAuth; |
| 78 | return applySecurityHeaders(NextResponse.redirect(url, 308)); |
| 79 | } |
| 80 | |
| 81 | // Check if locale is already in path (`pt-BR` is one segment). |
| 82 | const existing = pathLocale(pathname); |
| 83 | if (existing) { |
| 84 | // A miscased prefix names the same route, so fold `/pt-br/install` onto |
| 85 | // `/pt-BR/install` instead of letting it reach the bare-path branch |
| 86 | // below, which would redirect to `/en/pt-br/install` — a 404. One |
| 87 | // canonical spelling also keeps a single URL in the index. |
| 88 | const canonicalPath = replacePathLocale(pathname, existing); |
| 89 | let res: NextResponse; |
| 90 | if (canonicalPath === pathname) { |
| 91 | res = NextResponse.next(); |
| 92 | } else { |
| 93 | const url = req.nextUrl.clone(); |
| 94 | url.pathname = canonicalPath; |
| 95 | res = NextResponse.redirect(url, 308); |
| 96 | } |
| 97 | res.cookies.set(COOKIE, existing, { path: "/", maxAge: 60 * 60 * 24 * 365 }); |
| 98 | return applySecurityHeaders(res); |
| 99 | } |
| 100 | |
| 101 | // Redirect bare paths to the detected locale (deterministic: cookie, then |
| 102 | // Accept-Language full-tag/primary-subtag matching, then the default). |
| 103 | const locale = detectLocaleFromHeaders( |
| 104 | req.cookies.get(COOKIE)?.value, |
| 105 | req.headers.get("accept-language"), |
| 106 | ); |
| 107 | const url = req.nextUrl.clone(); |
| 108 | url.pathname = `/${locale}${pathname}`; |
| 109 | const res = NextResponse.redirect(url); |
| 110 | res.cookies.set(COOKIE, locale, { path: "/", maxAge: 60 * 60 * 24 * 365 }); |
| 111 | return applySecurityHeaders(res); |
| 112 | } |
| 113 | |
| 114 | export const config = { |
| 115 | // Match everything so security headers apply globally; the function |
| 116 | // bypasses redirect/locale logic for /_next, /api, and dotted paths. |
| 117 | matcher: ["/:path*"], |
| 118 | }; |
| 119 |