Migrate to app router (#2254)

app/api/count/route.ts

@@ -0,0 +1,31 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "../../../lib/helpers/prisma";
+import type { PageStats } from "../../../types";
+
+export const dynamic = "force-dynamic";
+export const revalidate = 0;
+
+export async function GET(req: NextRequest): Promise<NextResponse<PageStats>> {
+  const slug = req.nextUrl.searchParams.get("slug");
+
+  // extremely basic input validation.
+  // TODO: actually check if the note exists before continuing (and allow pages other than notes).
+  if (typeof slug !== "string" || !new RegExp(/^notes\/([A-Za-z0-9-]+)$/i).test(slug)) {
+    // @ts-expect-error
+    return NextResponse.json({ error: "Missing or invalid 'slug' parameter." }, { status: 400 });
+  }
+
+  // +1 hit!
+  const { hits } = await prisma.hits.upsert({
+    where: { slug },
+    create: { slug },
+    update: {
+      hits: {
+        increment: 1,
+      },
+    },
+  });
+
+  // add one to this page's count and return the new number
+  return NextResponse.json({ hits });
+}