From 1e4540aa4de3f7cf31eee146d6f1a89eda7c2ff0 Mon Sep 17 00:00:00 2001
From: Walid LARABI <walid.larabi@etu.unice.fr>
Date: Mon, 3 Feb 2020 16:42:40 +0100
Subject: [PATCH] upload files

---
 .../server/controller/UploadController.js     | 51 ++++++++-----------
 back-end/server/controller/index.js           |  2 +-
 2 files changed, 23 insertions(+), 30 deletions(-)

diff --git a/back-end/server/controller/UploadController.js b/back-end/server/controller/UploadController.js
index e9a57d3..3349a09 100644
--- a/back-end/server/controller/UploadController.js
+++ b/back-end/server/controller/UploadController.js
@@ -3,6 +3,8 @@ const multer = require('multer');
 const GridFsStorage = require('multer-gridfs-storage');
 const jwt = require('jsonwebtoken');
 const config = require('../config');
+const ObjectID = require('mongodb').ObjectID;
+
 let storage = new GridFsStorage({
     url:  config.DbConfig.DBURL,
     file: (req, file) => {
@@ -43,7 +45,7 @@ module.exports.getFile = (req, res) => {
     //never be allowed in a production app. Sanitize the input.
     let fileName = req.body.text1;
     //Connect to the MongoDB client
-    MongoClient.connect(config.DbConfig.DBURL, function(err, client){
+    MongoClient.connect(config.DbConfig.DBURL, async function(err, client){
         if(err){
             return res.status(500).send({title: 'Uploaded Error', message: 'MongoClient Connection error', error: err.errMsg});
         }
@@ -51,35 +53,26 @@ module.exports.getFile = (req, res) => {
 
         const collection = db.collection('plugins.files');
         const collectionChunks = db.collection('plugins.chunks');
-        collection.find({filename: fileName}).toArray(function(err, docs){
-            if(err){
-                return res.status(200).send({title: 'File error', message: 'Error finding file', error: err.errMsg});
-            }
-            if(!docs || docs.length === 0){
-                return res.status(200).send({title: 'Download Error', message: 'No file found'});
-            }else{
-                //Retrieving the chunks from the db
-                collectionChunks.find({files_id : docs[0]._id}).sort({n: 1}).toArray(function(err, chunks){
-                    if(err){
-                        return res.status(500).send({title: 'Download Error', message: 'Error retrieving chunks', error: err.errmsg});
-                    }
-                    if(!chunks || chunks.length === 0){
-                        //No data found
-                        return res.status(500).send({title: 'Download Error', message: 'No data found'});
-                    }
-                    //Append Chunks
-                    let fileData = [];
-                    for(let i=0; i<chunks.length;i++){
-                        //This is in Binary JSON or BSON format, which is stored
-                        //in fileData array in base64 endocoded string format
-                        fileData.push(chunks[i].data.toString('base64'));
-                    }
-                    //Display the chunks using the data URI format
-                    let finalFile = 'data:' + docs[0].contentType + ';base64,' + fileData.join('');
-                    res.status(200).send({title: 'Image File', message: 'Image loaded from MongoDB GridFS', imgurl: finalFile});
-                });
-            }
 
+
+        let result = await collection.findOne({filename: fileName});
+        console.log(result);
+
+        let bucket = new MongoClient.GridFSBucket(
+            db, {bucketName: "plugins"}
+        );
+        let downloadStream = bucket.openDownloadStream(ObjectID(result._id));
+
+        downloadStream.on('data', (chunk) => {
+            res.write(chunk);
+        });
+
+        downloadStream.on('error', () => {
+            res.sendStatus(404);
+        });
+
+        downloadStream.on('end', () => {
+            res.end();
         });
     });
 };
\ No newline at end of file
diff --git a/back-end/server/controller/index.js b/back-end/server/controller/index.js
index a2979eb..81413e5 100644
--- a/back-end/server/controller/index.js
+++ b/back-end/server/controller/index.js
@@ -6,5 +6,5 @@
 module.exports = {
     UserController    : require("./UserController"),
     PluginController    : require("./PluginController"),
-    UploadController    : require("./UploadController")
+    UploadController    : require("./UploadController"),
 };
\ No newline at end of file