'use strict';
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const path = require('path');
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const mime = require('mime');
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const DevMiddlewareError = require('./DevMiddlewareError');
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const {
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getFilenameFromUrl,
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handleRangeHeaders,
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handleRequest,
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ready,
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} = require('./util');
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// Do not add a charset to the Content-Type header of these file types
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// otherwise the client will fail to render them correctly.
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const NonCharsetFileTypes = /\.(wasm|usdz)$/;
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module.exports = function wrapper(context) {
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return function middleware(req, res, next) {
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// fixes #282. credit @cexoso. in certain edge situations res.locals is
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// undefined.
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// eslint-disable-next-line no-param-reassign
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res.locals = res.locals || {};
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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(
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context,
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() => {
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// eslint-disable-next-line no-param-reassign
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res.locals.webpackStats = context.webpackStats;
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// eslint-disable-next-line no-param-reassign
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res.locals.fs = context.fs;
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resolve(next());
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},
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req
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);
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});
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}
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const acceptedMethods = context.options.methods || ['GET', 'HEAD'];
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if (acceptedMethods.indexOf(req.method) === -1) {
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return goNext();
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}
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let filename = getFilenameFromUrl(
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context.options.publicPath,
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context.compiler,
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req.url
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);
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if (filename === false) {
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return goNext();
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}
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return new Promise((resolve) => {
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handleRequest(context, filename, processRequest, req);
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// eslint-disable-next-line consistent-return
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function processRequest() {
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try {
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let stat = context.fs.statSync(filename);
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if (!stat.isFile()) {
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if (stat.isDirectory()) {
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let { index } = context.options;
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// eslint-disable-next-line no-undefined
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if (index === undefined || index === true) {
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index = 'index.html';
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} else if (!index) {
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throw new DevMiddlewareError('next');
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}
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filename = path.posix.join(filename, index);
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stat = context.fs.statSync(filename);
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if (!stat.isFile()) {
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throw new DevMiddlewareError('next');
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}
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} else {
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throw new DevMiddlewareError('next');
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}
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}
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} catch (e) {
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return resolve(goNext());
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}
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// server content
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let content = context.fs.readFileSync(filename);
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content = handleRangeHeaders(content, req, res);
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let contentType = mime.getType(filename) || '';
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if (!NonCharsetFileTypes.test(filename)) {
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contentType += '; charset=UTF-8';
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}
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if (!res.getHeader || !res.getHeader('Content-Type')) {
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res.setHeader('Content-Type', contentType);
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}
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res.setHeader('Content-Length', content.length);
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const { headers } = context.options;
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if (headers) {
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for (const name in headers) {
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if ({}.hasOwnProperty.call(headers, name)) {
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res.setHeader(name, context.options.headers[name]);
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}
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}
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}
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// Express automatically sets the statusCode to 200, but not all servers do (Koa).
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// eslint-disable-next-line no-param-reassign
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res.statusCode = res.statusCode || 200;
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if (res.send) {
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res.send(content);
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} else {
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res.end(content);
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}
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resolve();
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}
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});
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};
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};
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