Class: Middleman::Thumbnailer::Rack

Inherits:
Object
  • Object
show all
Defined in:
lib/middleman-thumbnailer/extension.rb

Overview

Rack middleware to convert images on the fly

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Rack

Init

Parameters:

  • app (Class)
  • options (Hash) (defaults to: {}) 


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# File 'lib/middleman-thumbnailer/extension.rb', line 127

def initialize(app, options={})
  @app = app
  @options = options

  files = DirGlob.glob(options[:images_source_dir], options[:namespace_directory], options[:filetypes])

  @original_map = ThumbnailGenerator.original_map_for_files(files, options[:dimensions])

end

Instance Method Details

#call(env) ⇒ Array

Rack interface

Parameters:

  • env (Rack::Environmemt)

Returns:

  • (Array) 


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# File 'lib/middleman-thumbnailer/extension.rb', line 140

def call(env)
  status, headers, response = @app.call(env)

  path = env["PATH_INFO"]

  absolute_path = File.join(@options[:source_dir], path)

  root_dir =  @options[:middleman_app].root 

  tmp_dir = File.join(root_dir, 'tmp', 'middleman-thumbnail-cache')

  if original_specs = @original_map[absolute_path]
    thumbnail_path = Pathname.new original_specs[:spec][:name]
    #the name for the generate spec filename is relative to the source dir, remove this
    thumbnail_path = thumbnail_path.relative_path_from Pathname.new(@options[:source_dir])

    cache_file = File.join tmp_dir, thumbnail_path.to_s
    cache_dir = File.dirname cache_file
    FileUtils.mkdir_p(cache_dir) unless Dir.exist?(cache_dir)

    file_info = nil
    file_data = nil

    original_file = original_specs[:original]
    original_mtime = File.mtime original_file
    if File.exist?(cache_file) && (original_mtime == File.mtime(cache_file))
      file_data = IO.read(cache_file)
      file_info = {length: ::Rack::Utils.bytesize(file_data).to_s, mime_type: ::MIME::Types.type_for(cache_file).first.to_s}
    else
      image = ThumbnailGenerator.image_for_spec(original_file, original_specs[:spec])
      file_data = image.to_blob

      file_info = {length: ::Rack::Utils.bytesize(file_data).to_s, mime_type: image.mime_type}

      File.open(cache_file, 'wb') do |file|
        file.write file_data
      end

      File.utime(original_mtime, original_mtime, cache_file)

      image.destroy!
    end

    status = 200
    headers["Content-Length"] = file_info[:length]
    headers["Content-Type"] = file_info[:mime_type]
    response = [file_data]
  end
  [status, headers, response]
end