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