unpkg/server/middleware/MetadataUtils.js

52 lines
1.4 KiB
JavaScript

const fs = require('fs')
const { join: joinPaths } = require('path')
const { getContentType, getStats, getFileType } = require('./FileUtils')
const getEntries = (baseDir, path, maximumDepth) =>
new Promise((resolve, reject) => {
fs.readdir(joinPaths(baseDir, path), (error, files) => {
if (error) {
reject(error)
} else {
resolve(
Promise.all(
files.map(f => getStats(joinPaths(baseDir, path, f)))
).then(
statsArray => Promise.all(statsArray.map(
(stats, index) => getMetadata(baseDir, joinPaths(path, files[index]), stats, maximumDepth - 1)
))
)
)
}
})
})
const formatTime = (time) =>
new Date(time).toISOString()
const getMetadata = (baseDir, path, stats, maximumDepth) => {
const metadata = {
path,
lastModified: formatTime(stats.mtime),
contentType: getContentType(path),
size: stats.size,
type: getFileType(stats)
}
if (!stats.isDirectory() || maximumDepth === 0)
return Promise.resolve(metadata)
return getEntries(baseDir, path, maximumDepth).then(files => {
metadata.files = files
return metadata
})
}
const generateMetadata = (baseDir, path, stats, maximumDepth, callback) =>
getMetadata(baseDir, path, stats, maximumDepth)
.then(metadata => callback(null, metadata), callback)
module.exports = {
generateMetadata
}