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Serve compressed files if already exist #852

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Serve compressed files if already exist #852

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81ec061
Serve compressed files if already exist
De-Panther Feb 6, 2023
4b0a24d
Fix Content-Type issues based on tests
De-Panther Jul 10, 2023
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17 changes: 7 additions & 10 deletions lib/core/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,7 @@ module.exports = function createMiddleware(_dir, _options) {
const headers = opts.headers;
const weakEtags = opts.weakEtags;
const handleOptionsMethod = opts.handleOptionsMethod;
const defaultType = opts.contentType || 'application/octet-stream';

opts.root = dir;
if (defaultExt && /^\./.test(defaultExt)) {
Expand Down Expand Up @@ -185,6 +186,7 @@ module.exports = function createMiddleware(_dir, _options) {
let file = null;
let gzippedFile = null;
let brotliFile = null;
let contentType = null;

try {
decodeURIComponent(req.url); // check validity of url
Expand All @@ -201,8 +203,11 @@ module.exports = function createMiddleware(_dir, _options) {
)
);
// determine compressed forms if they were to exist
gzippedFile = `${file}.gz`;
brotliFile = `${file}.br`;
gzippedFile = file.endsWith('.gz') ? file : `${file}.gz`;
brotliFile = file.endsWith('.br') ? file : `${file}.br`;

// Do MIME lookup, fall back to octet-stream
contentType = mime.lookup(file, defaultType);

Object.keys(headers).forEach((key) => {
res.setHeader(key, headers[key]);
Expand All @@ -227,10 +232,6 @@ module.exports = function createMiddleware(_dir, _options) {


function serve(stat) {
// Do a MIME lookup, fall back to octet-stream and handle gzip
// and brotli special case.
const defaultType = opts.contentType || 'application/octet-stream';
let contentType = mime.lookup(file, defaultType);
const range = (req.headers && req.headers.range);
const lastModified = (new Date(stat.mtime)).toUTCString();
const etag = generateEtag(stat, weakEtags);
Expand All @@ -252,12 +253,8 @@ module.exports = function createMiddleware(_dir, _options) {

if (file === gzippedFile) { // is .gz picked up
res.setHeader('Content-Encoding', 'gzip');
// strip gz ending and lookup mime type
contentType = mime.lookup(path.basename(file, '.gz'), defaultType);
} else if (file === brotliFile) { // is .br picked up
res.setHeader('Content-Encoding', 'br');
// strip br ending and lookup mime type
contentType = mime.lookup(path.basename(file, '.br'), defaultType);
}

if (typeof cacheControl === 'function') {
Expand Down