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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');
module.exports = function wrapper(context) {
return function middleware(req, res, next) {
// fixes #282. credit @cexoso. in certain edge situations res.locals is
// undefined.
res.locals = res.locals || {};
function goNext() {
if (!context.options.serverSideRender) {
return next();
}
return new Promise(((resolve) => {
ready(context, () => {
res.locals.webpackStats = context.webpackStats;
res.locals.fs = context.fs;
resolve(next());
}, req);
}));
}
const acceptedMethods = context.options.methods || ['GET'];
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);
function processRequest() {
try {
let stat = context.fs.statSync(filename);
if (!stat.isFile()) {
if (stat.isDirectory()) {
let { index } = context.options;
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);
// do not add charset to WebAssembly files, otherwise compileStreaming will fail in the client
if (!/\.wasm$/.test(filename)) {
contentType += '; charset=UTF-8';
}
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).
res.statusCode = res.statusCode || 200;
if (res.send) res.send(content);
else res.end(content);
resolve();
}
}));
};
};
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