61 lines
1.6 KiB
TypeScript
61 lines
1.6 KiB
TypeScript
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import { next } from "@vercel/functions";
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import {
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getMarkdownAlternate,
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getMarkdownDocument,
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markdownResponse,
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negotiateRepresentation,
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NOT_FOUND_MARKDOWN,
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} from "./src/agent-content.js";
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const VARY_HEADER = "Accept, Accept-Encoding";
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export const config = {
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matcher: ["/((?!api|_astro|.*\\..*).*)"],
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};
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export default function middleware(request: Request): Response {
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if (request.method !== "GET" && request.method !== "HEAD") return next();
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const { pathname } = new URL(request.url);
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const acceptHeader = request.headers.get("accept");
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const representation = negotiateRepresentation(acceptHeader);
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const markdown = getMarkdownDocument(pathname);
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const genericAgentNotFound =
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!markdown && (!acceptHeader?.trim() || acceptHeader.trim() === "*/*");
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if (representation === "markdown" || genericAgentNotFound) {
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return markdownResponse(
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markdown ?? NOT_FOUND_MARKDOWN,
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request.method,
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markdown ? 200 : 404,
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);
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}
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if (representation === "not-acceptable") {
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return new Response(
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request.method === "HEAD"
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? null
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: "Not acceptable. Request text/html or text/markdown.\n",
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{
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status: 406,
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headers: {
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"Content-Type": "text/plain; charset=utf-8",
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Vary: VARY_HEADER,
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},
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},
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);
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}
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const markdownAlternate = getMarkdownAlternate(pathname);
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return next({
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headers: {
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...(markdownAlternate
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? {
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Link: `<${markdownAlternate}>; rel="alternate"; type="text/markdown"`,
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}
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: {}),
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Vary: VARY_HEADER,
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},
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});
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}
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