ENG-1825 Primitive content negotiation to expose our schema (#1098)

Author: maparent

apps/website/next.config.ts

@@ -1,5 +1,6 @@
 import nextra from "nextra";
 import type { NextConfig } from "next";
+import type { RouteHas } from "next/dist/lib/load-custom-routes";
 import { config } from "@repo/database/dbDotEnv";
 import { DOCS_REDIRECTS } from "./docsRouteMap";
 
@@ -19,6 +20,28 @@ const nextConfig: NextConfig = {
   async redirects() {
     return DOCS_REDIRECTS;
   },
+  async rewrites() {
+    function negotiateSchema(prefix: string) {
+      return {
+        source: `${prefix}`,
+        has: [
+          {
+            type: "header",
+            key: "accept",
+            value: "(.*)(\\btext/turtle\\b|\\btext/\\*|\\*/\\*)(.*)",
+          } as RouteHas,
+        ],
+        destination: `${prefix}.ttl`,
+      };
+    }
+    return {
+      beforeFiles: [
+        negotiateSchema("/schema/dg_base"),
+        negotiateSchema("/schema/dg_core"),
+      ],
+    };
+  },
+
   turbopack: {
     resolveAlias: {
       "next-mdx-import-source-file": "./mdx-components.tsx",

apps/website/proxy.ts

@@ -1,12 +1,26 @@
-import { type NextRequest } from "next/server";
+import { NextResponse, type NextRequest } from "next/server";
 import { updateSession } from "~/utils/supabase/proxy";
 
-export const proxy = async (request: NextRequest) =>
-  await updateSession(request);
+const NEGOTIATED_PATHS = new Set(["/schema/dg_base", "/schema/dg_core"]);
+const ACCEPTABLE = /(\btext\/turtle\b|\btext\/\*|\*\/\*)/;
+
+export const proxy = async (request: NextRequest): Promise<NextResponse> => {
+  const { pathname } = request.nextUrl;
+
+  if (NEGOTIATED_PATHS.has(pathname)) {
+    const accept = request.headers.get("accept") ?? "";
+    if (!ACCEPTABLE.test(accept)) {
+      return new NextResponse("You have to Accept text/turtle", {
+        status: 406,
+        headers: { "Content-Type": "text/plain" },
+      });
+    }
+    return NextResponse.next();
+  }
+
+  return await updateSession(request);
+};
 
 export const config = {
-  matcher: [
-    /* Only apply to /auth paths */
-    "/(auth/.*)",
-  ],
+  matcher: ["/schema/dg_base", "/schema/dg_core", "/(auth/.*)"],
 };