Class: Isomorfeus::Transport::CompressorRack

Inherits:
Object
  • Object
show all
Defined in:
lib/isomorfeus/transport/compressor_rack.rb

Defined Under Namespace

Classes: BrotliStream, GzipStream

Constant Summary collapse

C_ENCODINGS = 
%w[br gzip identity].freeze

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ CompressorRack

Returns a new instance of CompressorRack.



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# File 'lib/isomorfeus/transport/compressor_rack.rb', line 8

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

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/isomorfeus/transport/compressor_rack.rb', line 12

def call(env)
  status, headers, body = @app.call(env)
  headers = Rack::Utils::HeaderHash[headers]


  unless should_deflate?(env, status, headers, body)
    return [status, headers, body]
  end

  request = Rack::Request.new(env)

  encoding = Rack::Utils.select_best_encoding(C_ENCODINGS,
                                        request.accept_encoding)

  vary = headers["Vary"].to_s.split(",").map(&:strip)
  unless vary.include?("*") || vary.include?("Accept-Encoding")
    headers["Vary"] = vary.push("Accept-Encoding").join(",")
  end

  case encoding
  when "br"
    headers['Content-Encoding'] = "br"
    headers.delete(Rack::CONTENT_LENGTH)
    [status, headers, BrotliStream.new(body, @sync)]
  when "gzip"
    headers['Content-Encoding'] = "gzip"
    headers.delete(Rack::CONTENT_LENGTH)
    mtime = headers["Last-Modified"]
    mtime = Time.httpdate(mtime).to_i if mtime
    [status, headers, GzipStream.new(body, mtime, @sync)]
  when "identity"
    [status, headers, body]
  when nil
    message = "An acceptable encoding for the requested resource #{request.fullpath} could not be found."
    bp = Rack::BodyProxy.new([message]) { body.close if body.respond_to?(:close) }
    [406, { CONTENT_TYPE => "text/plain", CONTENT_LENGTH => message.length.to_s }, bp]
  end
end