Method patch

lib/ldp.mjs:685–718

(uri, patchObject)

  }

  async patch (uri, patchObject) {
    if (overQuota(this.quotaFile, this.quota)) {
      debug.handlers('PATCH -- Over quota')
      throw error(413, 'Storage quota exceeded')
    }

    const url = uri
    let path
    try {
      ({ path } = await this.resourceMapper.mapUrlToFile({ url }))
    } catch (err) {
      throw error(err.status || 500, err.message)
    }

    await withLock(path, async () => {
      let originalData = ''

      try {
        originalData = await promisify(fs.readFile)(path, { encoding: 'utf8' })
      } catch (err) {
        throw error(err, 'Cannot patch a file that does not exist')
      }

      const contentType = getContentType(path)
      const patchedData = await this.applyPatch(originalData, patchObject, contentType, uri)

      // Write patched data back to file
      await promisify(fs.writeFile)(path, patchedData, 'utf8')
    })

    await clearAclCache()

    debug.handlers('PATCH -- Patched:' + path)
  }

  async applyPatch (data, patchObject, contentType, uri) {
    const baseGraph = $rdf.graph()