module DataURL

Utilities for generating data URLs for use in HTML, CSS, etc.

Public Class Methods

generate(mime_type:, content:) click to toggle source

Generate a data URL. @param mime_type [String] media type of the data to encode @param content [String] content to encode @return [String] RFC 2397-compliant data URL.

# File lib/dataurl.rb, line 9
def self.generate(mime_type:, content:)
  "data:#{mime_type};base64,#{[content].pack('m0')}"
end

guess_mime(filename) click to toggle source

Guess the MIME type of a file using mailcap's /etc/mime.types. @param filename [String] filename to check against mime.types @return [String] media type or nil if it could not be detected

# File lib/dataurl.rb, line 16
def self.guess_mime(filename)
  extension = File.extname(filename)[1..-1].downcase

  File.foreach('/etc/mime.types') do |line|
    match = /\A([^#\s]+)\s+([^#]+)/.match(line)
    return match[1] if match && match[2].split.include?(extension)
  end

  nil
end