Function createParams

packages/content-disposition/src/index.ts:78–110

(filename?: string, fallback?: string | boolean)

}

function createParams(filename?: string, fallback?: string | boolean) {
  if (filename === undefined) return

  const params: Partial<
    Record<string, any> & {
      filename: string
    }
  > = {}

  // fallback defaults to true
  if (fallback === undefined) fallback = true

  if (typeof fallback === 'string' && NON_LATIN1_REGEXP.test(fallback))
    throw new TypeError('fallback must be ISO-8859-1 string')

  // restrict to file base name
  const name = basename(filename)

  // determine if name is suitable for quoted string
  const isQuotedString = TEXT_REGEXP.test(name)

  // generate fallback name
  const fallbackName = typeof fallback !== 'string' ? fallback && getlatin1(name) : basename(fallback)
  const hasFallback = typeof fallbackName === 'string' && fallbackName !== name

  // set extended filename parameter
  if (hasFallback || !isQuotedString || HEX_ESCAPE_REGEXP.test(name)) params['filename*'] = name

  // set filename parameter
  if (isQuotedString || hasFallback) params.filename = hasFallback ? fallbackName : name

  return params
}

const pdecode = (_str: string, hex: string) => String.fromCharCode(parseInt(hex, 16))