firebase-frameworks/dist/angular/index.js

Experimental addon to the Firebase CLI to add web framework support

import { handle as expressHandle } from "../express/index.js";
import { basename, join, normalize, relative } from "path";
import { createReadStream } from "fs";
import { mediaTypes } from "@hapi/accept";
const LOCALE_FORMATS = [/^ALL_[a-z]+$/, /^[a-z]+_ALL$/, /^[a-z]+(_[a-z]+)?$/];
const NG_BROWSER_OUTPUT_PATH = process.env.__NG_BROWSER_OUTPUT_PATH__;
export const handle = async (req, res) => {
    if (basename(req.path) === "__image__") {
        const { src, locale = "" } = req.query;
        if (typeof src !== "string" ||
            typeof locale !== "string" ||
            (!!locale && !LOCALE_FORMATS.some((it) => locale.match(it))) ||
            !NG_BROWSER_OUTPUT_PATH)
            return res.sendStatus(404);
        const normalizedPath = normalize(join(NG_BROWSER_OUTPUT_PATH, locale, src));
        if (relative(NG_BROWSER_OUTPUT_PATH, normalizedPath).startsWith(".."))
            return res.sendStatus(404);
        const { default: sharp } = await import("sharp");
        const width = typeof req.query.width === "string" ? parseInt(req.query.width) : undefined;
        const accepts = mediaTypes(req.headers.accept);
        const format = accepts.includes("image/webp") ? "webp" : undefined;
        const pipeline = sharp().resize({ width });
        if (format)
            pipeline[format]();
        // TODO allow override
        res.setHeader("Cache-Control", "public, max-age=3600, s-maxage=86400");
        res.setHeader("Vary", "Accept, Accept-Encoding");
        createReadStream(normalizedPath).pipe(pipeline).pipe(res);
    }
    else {
        await expressHandle(req, res);
    }
};