Class: PDFKit::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/pdfkit/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/pdfkit/middleware.rb', line 3

def initialize(app, options = {}, conditions = {})
  @app        = app
  @options    = options
  @conditions = conditions
  @render_pdf = false
  @caching    = @conditions.delete(:caching) { false }
end

Instance Method Details

#_call(env) ⇒ Object


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# File 'lib/pdfkit/middleware.rb', line 15

def _call(env)
  @request    = Rack::Request.new(env)
  @render_pdf = false

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

  begin
    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)

      root_url = root_url(env)
      protocol = protocol(env)
      options = @options.merge(root_url: root_url, protocol: protocol)

      if headers['PDFKit-javascript-delay']
        options.merge!(javascript_delay: headers.delete('PDFKit-javascript-delay').to_i)
      end

      body = PDFKit.new(body, options).to_pdf
      response = [body]

      if headers['PDFKit-save-pdf']
        File.open(headers['PDFKit-save-pdf'], 'wb') { |file| file.write(body) } rescue nil
        headers.delete('PDFKit-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'
      headers['Content-Disposition'] ||= @conditions[:disposition] || 'inline'
    end
  rescue StandardError => e
    status = 500
    response = [e.message]
  end

  [status, headers, response]
end

#call(env) ⇒ Object


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

def call(env)
  dup._call(env)
end