| 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.${CANONICAL_HOST}`) return null; |
| 41 | const url = req.nextUrl.clone(); |
| 42 | url.host = CANONICAL_HOST; |
| 43 | url.port = ""; |
| 44 | // 308, not 301: clients may turn a 301'd POST (the admin login and post |
| 45 | // forms) into a GET and drop its body. 308 keeps the method and body and is |
| 46 | // still a permanent move for crawlers. |
| 47 | return NextResponse.redirect(url, 308); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Paths with no page of their own that should land on installation in one |
| 52 | * hop, bare or localized. `/download` and `/desktop` 404'd (M2) until a dark |
| 53 | * download hub exists (D11). `/pricing` went bare → `/en/pricing` → |
| 54 | * `/en/install` (UX-13); public pricing stays off (§0), so it keeps landing on |
| 55 | * install — `app/[locale]/pricing/page.tsx` still redirects as a backstop. |
| 56 | * Temporary (307) because each of these may become a real page later. |
| 57 | */ |
| 58 | const INSTALL_ALIASES = new Set(["download", "desktop", "pricing"]); |
| 59 | |
| 60 | function installAliasRedirect(req: NextRequest): NextResponse | null { |
| 61 | const segments = req.nextUrl.pathname.split("/").filter(Boolean); |
| 62 | const existing = pathLocale(req.nextUrl.pathname); |
| 63 | const rest = existing ? segments.slice(1) : segments; |
| 64 | if (rest.length !== 1 || !INSTALL_ALIASES.has(rest[0].toLowerCase())) return null; |
| 65 | const locale = |
| 66 | existing ?? |
| 67 | detectLocaleFromHeaders(req.cookies.get(COOKIE)?.value, req.headers.get("accept-language")); |
| 68 | const url = req.nextUrl.clone(); |
| 69 | url.pathname = `/${locale}/install`; |
| 70 | const res = NextResponse.redirect(url, 307); |
| 71 | res.cookies.set(COOKIE, locale, { path: "/", maxAge: 60 * 60 * 24 * 365 }); |
| 72 | return res; |
| 73 | } |
| 74 | |
| 75 | export function middleware(req: NextRequest) { |
| 76 | const { pathname } = req.nextUrl; |
| 77 | |
| 78 | const canonical = canonicalHostRedirect(req); |
| 79 | if (canonical) return applySecurityHeaders(canonical); |
| 80 | |
| 81 | // Skip API routes, static files, _next, and the dot-less metadata route |
| 82 | // for the shared OG image (but still apply security headers). |
| 83 | if ( |
| 84 | pathname.startsWith("/api/") || |
| 85 | pathname.startsWith("/_next/") || |
| 86 | pathname === "/opengraph-image" || |
| 87 | pathname.includes(".") |
| 88 | ) { |
| 89 | return applySecurityHeaders(NextResponse.next()); |
| 90 | } |
| 91 | |
| 92 | // Auth callbacks belong on the CWC app. Locale-prefixing them produced |
| 93 | // `/en/auth/callback` 404s (#5767). Preserve the query string. |
| 94 | const callback = publicAuthCallbackDestination(req.nextUrl); |
| 95 | if (callback) { |
| 96 | return applySecurityHeaders(NextResponse.redirect(callback, 307)); |
| 97 | } |
| 98 | |
| 99 | // `/login` and `/register` are aliases for the public sign-in / create-account |
| 100 | // pages. Fold them before locale detection so `/login` becomes `/en/signin` |
| 101 | // instead of `/en/login` (which has no page). |
| 102 | const canonicalAuth = canonicalPublicAuthPath(pathname); |
| 103 | if (canonicalAuth && canonicalAuth !== pathname) { |
| 104 | const url = req.nextUrl.clone(); |
| 105 | url.pathname = canonicalAuth; |
| 106 | return applySecurityHeaders(NextResponse.redirect(url, 308)); |
| 107 | } |
| 108 | |
| 109 | const installAlias = installAliasRedirect(req); |
| 110 | if (installAlias) return applySecurityHeaders(installAlias); |
| 111 | |
| 112 | // Check if locale is already in path (`pt-BR` is one segment). |
| 113 | const existing = pathLocale(pathname); |
| 114 | if (existing) { |
| 115 | // A miscased prefix names the same route, so fold `/pt-br/install` onto |
| 116 | // `/pt-BR/install` instead of letting it reach the bare-path branch |
| 117 | // below, which would redirect to `/en/pt-br/install` — a 404. One |
| 118 | // canonical spelling also keeps a single URL in the index. |
| 119 | const canonicalPath = replacePathLocale(pathname, existing); |
| 120 | let res: NextResponse; |
| 121 | if (canonicalPath === pathname) { |
| 122 | res = NextResponse.next(); |
| 123 | } else { |
| 124 | const url = req.nextUrl.clone(); |
| 125 | url.pathname = canonicalPath; |
| 126 | res = NextResponse.redirect(url, 308); |
| 127 | } |
| 128 | res.cookies.set(COOKIE, existing, { path: "/", maxAge: 60 * 60 * 24 * 365 }); |
| 129 | return applySecurityHeaders(res); |
| 130 | } |
| 131 | |
| 132 | // Redirect bare paths to the detected locale (deterministic: cookie, then |
| 133 | // Accept-Language full-tag/primary-subtag matching, then the default). |
| 134 | const locale = detectLocaleFromHeaders( |
| 135 | req.cookies.get(COOKIE)?.value, |
| 136 | req.headers.get("accept-language"), |
| 137 | ); |
| 138 | const url = req.nextUrl.clone(); |
| 139 | url.pathname = `/${locale}${pathname}`; |
| 140 | const res = NextResponse.redirect(url); |
| 141 | res.cookies.set(COOKIE, locale, { path: "/", maxAge: 60 * 60 * 24 * 365 }); |
| 142 | return applySecurityHeaders(res); |
| 143 | } |
| 144 | |
| 145 | export const config = { |
| 146 | // Match everything so security headers apply globally; the function |
| 147 | // bypasses redirect/locale logic for /_next, /api, and dotted paths. |
| 148 | matcher: ["/:path*"], |
| 149 | }; |
| 150 |