superstatic/lib/providers/memory.js

A static file server for fancy apps

"use strict";
/**
 * Copyright (c) 2022 Google LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
const crypto = require("crypto");
const Readable = require("stream").Readable;
module.exports = function (options) {
    const fn = function (req, pathname) {
        pathname = decodeURI(pathname);
        if (!options.store[pathname]) {
            return Promise.resolve(null);
        }
        const content = options.store[pathname];
        const stream = new Readable();
        stream.push(content);
        stream.push(null);
        const hash = crypto.createHash("md5");
        hash.update(content);
        return Promise.resolve({
            modified: options.modified || null,
            stream: stream,
            size: content.length,
            etag: hash.digest("hex"),
        });
    };
    fn.store = options.store || {};
    return fn;
};