class PDFKit class Middleware def initialize(app, options = {}, conditions = {}) @app = app @options = options @conditions = conditions end 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) 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] # Do not cache PDFs headers.delete('ETag') headers.delete('Cache-Control') 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 def translate_paths(body, env) # Host with protocol root = PDFKit.configuration.root_url || "#{env['rack.url_scheme']}://#{env['HTTP_HOST']}/" body.gsub(/(href|src)=(['"])\/([^\"']*|[^"']*)['"]/, '\1=\2' + root + '\3\2') end def rendering_pdf? @render_pdf end def render_as_pdf? request_path_is_pdf = @request.path.match(%r{\.pdf$}) if request_path_is_pdf && @conditions[:only] rules = [@conditions[:only]].flatten rules.any? do |pattern| if pattern.is_a?(Regexp) @request.path =~ pattern else @request.path[0, pattern.length] == pattern end end elsif request_path_is_pdf && @conditions[:except] rules = [@conditions[:except]].flatten rules.map do |pattern| if pattern.is_a?(Regexp) return false if @request.path =~ pattern else return false if @request.path[0, pattern.length] == pattern end end return true else request_path_is_pdf end end def set_request_to_render_as_pdf(env) @render_pdf = true path = @request.path.sub(%r{\.pdf$}, '') %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 end end