Zaid Humaimidi
c3954c277f
Separated cwmp and ui code into distinct files to enhance clarity and maintainability with varied internal data representations.
106 lines
3.1 KiB
TypeScript
106 lines
3.1 KiB
TypeScript
/**
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* Copyright 2013-2019 GenieACS Inc.
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*
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* This file is part of GenieACS.
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*
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* GenieACS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* GenieACS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with GenieACS. If not, see <http://www.gnu.org/licenses/>.
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*/
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import * as url from "url";
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import { IncomingMessage, ServerResponse } from "http";
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import { PassThrough, pipeline, Readable } from "stream";
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import { filesBucket, collections } from "./db/db";
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import * as logger from "./logger";
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import { getRequestOrigin } from "./forwarded";
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import memoize from "./common/memoize";
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const getFile = memoize(
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async (
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uploadDate: number,
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size: number,
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filename: string
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): Promise<Iterable<Buffer>> => {
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const chunks: Buffer[] = [];
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// Using for-await over the download stream can throw ERR_STREAM_PREMATURE_CLOSE
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// for very small files. Possibly a bug in MongoDB driver or Nodejs itself.
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// Using a PassThrough stream to avoid this.
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const downloadStream = pipeline(
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filesBucket.openDownloadStreamByName(filename),
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new PassThrough(),
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(err) => {
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if (err) throw err;
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}
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);
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for await (const chunk of downloadStream) chunks.push(chunk);
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// Node 12-14 don't throw error when stream is closed prematurely.
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// However, we don't need to check for that since we're checking file size.
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if (size !== chunks.reduce((a, b) => a + b.length, 0))
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throw new Error("File size mismatch");
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return chunks;
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}
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);
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export async function listener(
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request: IncomingMessage,
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response: ServerResponse
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): Promise<void> {
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if (request.method !== "GET" && request.method !== "HEAD") {
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response.writeHead(405, { Allow: "GET, HEAD" });
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response.end("405 Method Not Allowed");
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return;
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}
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const urlParts = url.parse(request.url, true);
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const filename = decodeURIComponent(urlParts.pathname.substring(1));
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const log = {
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message: "Fetch file",
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filename: filename,
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remoteAddress: getRequestOrigin(request).remoteAddress,
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method: request.method,
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};
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const file = await collections.files.findOne({ _id: filename });
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if (!file) {
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response.writeHead(404);
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response.end();
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log.message += " not found";
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logger.accessError(log);
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return;
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}
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response.writeHead(200, {
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"Content-Type": "application/octet-stream",
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"Content-Length": file.length,
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});
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logger.accessInfo(log);
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if (request.method === "HEAD") {
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response.end();
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return;
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}
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const chunks = await getFile(
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file["uploadDate"].getTime(),
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file.length,
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filename
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);
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pipeline(Readable.from(chunks), response, () => {
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// Ignore errors resulting from client disconnecting
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});
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}
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