astro/dist/assets/fonts/core/font-file-middleware.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

import { isAstroError } from "../../../core/errors/errors.js";
import { formatErrorMessage } from "../../../core/messages/runtime.js";
import { collectErrorMetadata } from "../../../core/errors/dev/utils.js";
export function resToMinimalResponse(res) {
	return {
		setHeader: (...args) => res.setHeader(...args),
		end: (...args) => res.end(...args),
		setStatusCode: (statusCode) => {
			res.statusCode = statusCode;
		}
	};
}
export async function fontFileMiddleware({ url: _url, response, next, fontFetcher, fontTypeExtractor, logger, fontFileById }) {
	if (!fontFetcher || !fontTypeExtractor || !fontFileById) {
		logger.debug("assets", "Fonts dependencies should be initialized by now, skipping middleware.");
		return next();
	}
	if (!_url) {
		return next();
	}
	const url = new URL(_url, "http://localhost");
	const fontId = url.pathname.slice(1);
	const fontData = fontFileById.get(fontId);
	if (!fontData) {
		return next();
	}
	// We don't want the request to be cached in dev because we cache it already internally,
	// and it makes it easier to debug without needing hard refreshes
	response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0");
	response.setHeader("Pragma", "no-cache");
	response.setHeader("Expires", "0");
	try {
		const buffer = await fontFetcher.fetch({
			id: fontId,
			...fontData
		});
		response.setHeader("Content-Length", buffer.byteLength.toString());
		response.setHeader("Content-Type", `font/${fontTypeExtractor.extract(fontId)}`);
		response.setStatusCode(200);
		response.end(buffer);
	} catch (err) {
		logger.error("assets", "Cannot download font file");
		if (isAstroError(err)) {
			logger.error("SKIP_FORMAT", formatErrorMessage(collectErrorMetadata(err), logger.level() === "debug"));
		}
		response.setStatusCode(500);
		response.end();
	}
}