class PDFKit class Middleware def initialize(app, options = {}, conditions = {}) @app = app @options = options @conditions = conditions @render_pdf = false end 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 = PDFKit.new(translate_paths(body, env), @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' end [status, headers, response] end private # Change relative paths to absolute, and relative protocols to absolute protocols def translate_paths(body, env) body = translate_relative_paths(body, env) translate_relative_protocols(body, env) end def translate_relative_paths(body, env) root = PDFKit.configuration.root_url || "#{env['rack.url_scheme']}://#{env['HTTP_HOST']}/" # Try out this regexp using rubular http://rubular.com/r/vmuGSkheuu body.gsub(/(href|src)=(['"])\/([^\/]([^\"']*|[^"']*))['"]/, "\\1=\\2#{root}\\3\\2") end def translate_relative_protocols(body, env) protocol = "#{env['rack.url_scheme']}://" # Try out this regexp using rubular http://rubular.com/r/0Ohk0wFYxV body.gsub(/(href|src)=(['"])\/\/([^\"']*|[^"']*)['"]/, "\\1=\\2#{protocol}\\3\\2") end def rendering_pdf? @render_pdf end def render_as_pdf? request_path = @request.path request_path_is_pdf = request_path.match(%r{\.pdf$}) if request_path_is_pdf && @conditions[:only] conditions_as_regexp(@conditions[:only]).any? do |pattern| request_path =~ pattern end elsif request_path_is_pdf && @conditions[:except] conditions_as_regexp(@conditions[:except]).each do |pattern| return false if request_path =~ pattern end return true else request_path_is_pdf end end def set_request_to_render_as_pdf(env) @render_pdf = true path = @request.path.sub(%r{\.pdf$}, '') path = path.sub(@request.script_name, '') %w[PATH_INFO REQUEST_URI].each { |e| env[e] = path } env['HTTP_ACCEPT'] = concat(env['HTTP_ACCEPT'], Rack::Mime.mime_type('.html')) env['Rack-Middleware-PDFKit'] = 'true' end def concat(accepts, type) (accepts || '').split(',').unshift(type).compact.join(',') end def conditions_as_regexp(conditions) [conditions].flatten.map do |pattern| pattern.is_a?(Regexp) ? pattern : Regexp.new('^' + pattern) end end end end