Class: WeasyPrint::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/weasyprint/middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}, conditions = {}) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/weasyprint/middleware.rb', line 5

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

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/weasyprint/middleware.rb', line 11

def call(env)
  @request    = Rack::Request.new(env)
  @render_pdf = false
  @caching    = @conditions.delete(:caching) { false }

  set_request_to_render_as_pdf(env) if render_as_pdf?
  status, headers, response = @app.call(env)

  if rendering_pdf? && headers['Content-Type'] =~ /text\/html|application\/xhtml\+xml/
    body = response.respond_to?(:body) ? response.body : response.join
    body = body.join if body.is_a?(Array)
    body = WeasyPrint.new(translate_paths(body, env), @options).to_pdf
    response = [body]

    if headers['WeasyPrint-save-pdf']
      File.open(headers['WeasyPrint-save-pdf'], 'wb') { |file| file.write(body) } rescue nil
      headers.delete('WeasyPrint-save-pdf')
    end

    unless @caching
      # Do not cache PDFs
      headers.delete('ETag')
      headers.delete('Cache-Control')
    end

    headers['Content-Length']         = (body.respond_to?(:bytesize) ? body.bytesize : body.size).to_s
    headers['Content-Type']           = 'application/pdf'
  end

  [status, headers, response]
end