iframe-proxy | Sunbelt Computer Software

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import path from 'path'
import mime from 'mime-types'
import fs from 'fs/promises'
const DEFAULT_CONTENT_TYPE = 'application/octet-stream'
const TURTLE_EXTENSIONS = ['.ttl', '.acl', '.meta']
export class ResourceMapper {
  constructor ({ rootUrl, rootPath }) {
    this.rootUrl = rootUrl.endsWith('/') ? rootUrl : rootUrl + '/'
    this.rootPath = rootPath.endsWith('/') ? rootPath : rootPath + '/'
  urlToFilePath (url) {
    const pathname = new URL(url, this.rootUrl).pathname
    const decoded = decodeURIComponent(pathname)
    const filePath = path.join(this.rootPath, decoded)
    if (!filePath.startsWith(this.rootPath)) {
      throw new Error('Path traversal detected')
    return filePath
  filePathToUrl (filePath) {
    let relative = path.relative(this.rootPath, filePath)
    if (path.sep !== '/') {
      relative = relative.split(path.sep).join('/')
    const encoded = relative.split('/').map(encodeURIComponent).join('/')
    return new URL(encoded, this.rootUrl).href
  isContainer (filePath) {
    return filePath.endsWith('/')
  getContentType (filePath) {
    const ext = path.extname(filePath).toLowerCase()
    if (TURTLE_EXTENSIONS.includes(ext)) return 'text/turtle'
    return mime.lookup(filePath) || DEFAULT_CONTENT_TYPE
  async getContentTypeForExisting (filePath) {
      const stat = await fs.stat(filePath)
      if (stat.isDirectory()) return 'text/turtle'
    } catch { /* ignore */ }
    return this.getContentType(filePath)
  extensionForType (contentType) {
    if (!contentType) return ''
    const mimeStr = contentType.split(';')[0].trim().toLowerCase()
    if (mimeStr === 'text/turtle') return '.ttl'
    if (mimeStr === 'text/n3') return '.n3'
    if (mimeStr === 'application/ld+json') return '.jsonld'
    if (mimeStr === 'application/rdf+xml') return '.rdf'
    if (mimeStr === 'application/n-triples') return '.nt'
    if (mimeStr === 'application/n-quads') return '.nq'
    return mime.extension(mimeStr) ? '.' + mime.extension(mimeStr) : ''

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