109 lines
3.2 KiB
TypeScript
109 lines
3.2 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 { Collection, GridFSBucket } from "mongodb";
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import { onConnect } from "./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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let filesCollection: Collection;
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let filesBucket: GridFSBucket;
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onConnect(async (db) => {
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filesCollection = db.collection("fs.files");
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filesBucket = new GridFSBucket(db);
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});
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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") {
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response.writeHead(405, { Allow: "GET" });
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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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};
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const file = await filesCollection.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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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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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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pipeline(Readable.from(chunks), response, () => {
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// Ignore errors resulting from client disconnecting
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});
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logger.accessInfo(log);
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}
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