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import { open } from 'fs/promises';
import path from 'path';
import asyncHandler from 'express-async-handler';
import { defaults, groupBy } from 'lodash';
const ASSETS_PATH = path.resolve( __dirname, '../../../build' );
const ASSETS_FILE = path.join( ASSETS_PATH, `assets.json` );
const EMPTY_ASSETS = { js: [], 'css.ltr': [], 'css.rtl': [] };
const getAssetType = ( asset ) => {
if ( asset.endsWith( '.rtl.css' ) ) {
return 'css.rtl';
}
if ( asset.endsWith( '.css' ) ) {
return 'css.ltr';
}
return 'js';
};
const groupAssetsByType = ( assets ) => defaults( groupBy( assets, getAssetType ), EMPTY_ASSETS );
/**
* @returns {import('express').RequestHandler}
*/
export default () => {
let assetsFile = null;
let assetsFileModified = 0;
async function doReadAssets() {
const fd = await open( ASSETS_FILE );
const stats = await fd.stat();
if ( ! assetsFile || stats.mtimeMs > assetsFileModified ) {
assetsFile = JSON.parse( await fd.readFile( 'utf8' ) );
assetsFileModified = stats.mtimeMs;
}
await fd.close();
return assetsFile;
}
let checking = null;
function readAssets() {
if ( ! checking ) {
checking = doReadAssets().finally( () => {
checking = null;
} );
}
return checking;
}
return asyncHandler( async ( req, res, next ) => {
const assets = await readAssets();
req.getAssets = () => assets;
req.getFilesForChunkGroup = ( name ) => {
const chunkGroupAssets = assets.assets[ name ];
if ( ! chunkGroupAssets ) {
console.warn( 'cannot find chunk group ' + chunkGroupAssets );
console.warn( 'available chunk groups:' );
for ( const availName of Object.keys( assets.assets ) ) {
console.log( ' ' + availName );
}
return EMPTY_ASSETS;
}
return groupAssetsByType( chunkGroupAssets );
};
req.getEmptyAssets = () => EMPTY_ASSETS;
next();
} );
};
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