237 lines
6.9 KiB
JavaScript
237 lines
6.9 KiB
JavaScript
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"use strict";
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const path = require("path");
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const mime = require("mime-types");
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const parseRange = require("range-parser");
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const getFilenameFromUrl = require("./utils/getFilenameFromUrl");
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const {
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getHeaderNames,
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getHeaderFromRequest,
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getHeaderFromResponse,
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setHeaderForResponse,
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setStatusCode,
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send
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} = require("./utils/compatibleAPI");
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const ready = require("./utils/ready");
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/** @typedef {import("./index.js").NextFunction} NextFunction */
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/** @typedef {import("./index.js").IncomingMessage} IncomingMessage */
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/** @typedef {import("./index.js").ServerResponse} ServerResponse */
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/**
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* @param {string} type
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* @param {number} size
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* @param {import("range-parser").Range} [range]
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* @returns {string}
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*/
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function getValueContentRangeHeader(type, size, range) {
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return `${type} ${range ? `${range.start}-${range.end}` : "*"}/${size}`;
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}
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/**
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* @param {string | number} title
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* @param {string} body
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* @returns {string}
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*/
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function createHtmlDocument(title, body) {
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return `${"<!DOCTYPE html>\n" + '<html lang="en">\n' + "<head>\n" + '<meta charset="utf-8">\n' + "<title>"}${title}</title>\n` + `</head>\n` + `<body>\n` + `<pre>${body}</pre>\n` + `</body>\n` + `</html>\n`;
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}
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const BYTES_RANGE_REGEXP = /^ *bytes/i;
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/**
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* @template {IncomingMessage} Request
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* @template {ServerResponse} Response
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* @param {import("./index.js").Context<Request, Response>} context
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* @return {import("./index.js").Middleware<Request, Response>}
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*/
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function wrapper(context) {
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return async function middleware(req, res, next) {
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const acceptedMethods = context.options.methods || ["GET", "HEAD"]; // fixes #282. credit @cexoso. in certain edge situations res.locals is undefined.
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// eslint-disable-next-line no-param-reassign
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res.locals = res.locals || {};
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if (req.method && !acceptedMethods.includes(req.method)) {
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await goNext();
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return;
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}
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ready(context, processRequest, req);
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async function goNext() {
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if (!context.options.serverSideRender) {
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return next();
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}
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return new Promise(resolve => {
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ready(context, () => {
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/** @type {any} */
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// eslint-disable-next-line no-param-reassign
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res.locals.webpack = {
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devMiddleware: context
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};
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resolve(next());
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}, req);
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});
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}
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async function processRequest() {
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const filename = getFilenameFromUrl(context,
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/** @type {string} */
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req.url);
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if (!filename) {
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await goNext();
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return;
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}
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let {
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headers
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} = context.options;
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if (typeof headers === "function") {
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// @ts-ignore
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headers = headers(req, res, context);
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}
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/**
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* @type {{key: string, value: string | number}[]}
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*/
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const allHeaders = [];
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if (typeof headers !== "undefined") {
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if (!Array.isArray(headers)) {
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// eslint-disable-next-line guard-for-in
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for (const name in headers) {
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// @ts-ignore
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allHeaders.push({
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key: name,
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value: headers[name]
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});
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}
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headers = allHeaders;
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}
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headers.forEach(
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/**
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* @param {{key: string, value: any}} header
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*/
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header => {
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setHeaderForResponse(res, header.key, header.value);
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});
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}
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if (!getHeaderFromResponse(res, "Content-Type")) {
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// content-type name(like application/javascript; charset=utf-8) or false
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const contentType = mime.contentType(path.extname(filename)); // Only set content-type header if media type is known
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// https://tools.ietf.org/html/rfc7231#section-3.1.1.5
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if (contentType) {
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setHeaderForResponse(res, "Content-Type", contentType);
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}
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}
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if (!getHeaderFromResponse(res, "Accept-Ranges")) {
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setHeaderForResponse(res, "Accept-Ranges", "bytes");
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}
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const rangeHeader = getHeaderFromRequest(req, "range");
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let start;
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let end;
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if (rangeHeader && BYTES_RANGE_REGEXP.test(rangeHeader)) {
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const size = await new Promise(resolve => {
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/** @type {import("fs").lstat} */
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context.outputFileSystem.lstat(filename, (error, stats) => {
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if (error) {
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context.logger.error(error);
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return;
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}
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resolve(stats.size);
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});
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});
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const parsedRanges = parseRange(size, rangeHeader, {
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combine: true
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});
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if (parsedRanges === -1) {
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const message = "Unsatisfiable range for 'Range' header.";
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context.logger.error(message);
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const existingHeaders = getHeaderNames(res);
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for (let i = 0; i < existingHeaders.length; i++) {
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res.removeHeader(existingHeaders[i]);
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}
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setStatusCode(res, 416);
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setHeaderForResponse(res, "Content-Range", getValueContentRangeHeader("bytes", size));
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setHeaderForResponse(res, "Content-Type", "text/html; charset=utf-8");
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const document = createHtmlDocument(416, `Error: ${message}`);
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const byteLength = Buffer.byteLength(document);
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setHeaderForResponse(res, "Content-Length", Buffer.byteLength(document));
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send(req, res, document, byteLength);
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return;
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} else if (parsedRanges === -2) {
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context.logger.error("A malformed 'Range' header was provided. A regular response will be sent for this request.");
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} else if (parsedRanges.length > 1) {
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context.logger.error("A 'Range' header with multiple ranges was provided. Multiple ranges are not supported, so a regular response will be sent for this request.");
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}
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if (parsedRanges !== -2 && parsedRanges.length === 1) {
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// Content-Range
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setStatusCode(res, 206);
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setHeaderForResponse(res, "Content-Range", getValueContentRangeHeader("bytes", size,
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/** @type {import("range-parser").Ranges} */
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parsedRanges[0]));
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[{
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start,
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end
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}] = parsedRanges;
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}
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}
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const isFsSupportsStream = typeof context.outputFileSystem.createReadStream === "function";
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let bufferOtStream;
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let byteLength;
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try {
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if (typeof start !== "undefined" && typeof end !== "undefined" && isFsSupportsStream) {
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bufferOtStream =
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/** @type {import("fs").createReadStream} */
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context.outputFileSystem.createReadStream(filename, {
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start,
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end
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});
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byteLength = end - start + 1;
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} else {
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bufferOtStream =
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/** @type {import("fs").readFileSync} */
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context.outputFileSystem.readFileSync(filename);
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({
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byteLength
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} = bufferOtStream);
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}
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} catch (_ignoreError) {
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await goNext();
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return;
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}
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send(req, res, bufferOtStream, byteLength);
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}
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};
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}
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module.exports = wrapper;
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