File name with original file name (close #262)

lib/routes/attachment.js

@@ -23,12 +23,14 @@ module.exports = function(crowi, app) {
       // TODO: file delivery plugin for cdn
       Attachment.findDeliveryFile(data)
       .then(fileName => {
+        const encodedFileName = encodeURIComponent(data.originalName);
 
         var deliveryFile = {
           fileName: fileName,
           options: {
             headers: {
               'Content-Type': data.fileFormat,
+              'Content-Disposition': `inline;filename*=UTF-8''${encodedFileName}`,
             },
           },
         };