file uploader S3 completed & ready to deploy

Author: num-js

.gitignore

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+# dependencies
+/node_modules
+
+# misc
+.DS_Store
+.env

app.js

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+const express = require('express');
+const cors = require('cors');
+const expressFileUpload = require('express-fileupload');
+require('dotenv/config');
+
+const app = express();
+
+// Middlewares
+app.use(cors());
+app.use(express.json());
+app.use(expressFileUpload());
+
+app.use('/file', require('./routes/fileUploadRoute'))
+
+app.get('/', (req, res) => {
+    res.status(200).json({
+        msg: 'Welcome to File-Upload-S3, use this route for file Upload - /file/file-upload'
+    });
+});
+
+module.exports = app;

controllers/S3Setup.js

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+const AWS = require('aws-sdk');
+
+
+AWS.config.update({
+    accessKeyId: process.env.AWS_ACCESS_KEY_ID,
+    secretAccessKey: process.env.AWS_SECRET_KEY,
+    region: process.env.AWS_REGION
+});
+
+const S3 = new AWS.S3({ apiVersion: '2006-03-01' });
+
+module.exports = { S3 };

controllers/fileUploadController.js

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+const { S3 } = require('./S3Setup');
+
+/**
+ * File Upload into S3 Bucket
+ * @param {object} req - Request
+ * @param {object} res - Responce
+ */
+const fileUpload = async (req, res) => {
+    if (req.files) {
+        //File Upload to S3
+        const file = req.files.file;
+
+        let dirName = getDirName(req.body.upload_type);
+        var uploadParams = {
+            Bucket: process.env.AWS_BUCKET_NAME,
+            Key: dirName + file.name,
+            ContentType: file.mimetype,
+            ACL: 'public-read',
+            Body: file.data,
+        };
+
+        const uploadRes = await new Promise((resolve, reject) => {
+            S3.upload(uploadParams, (err, data) => {
+                if (err) {
+                    reject(err);
+                } if (data) {
+                    resolve(data)
+                }
+            })
+        });
+
+        //Send response to front-end
+        res.status(200).json({
+            msg: 'File Uploaded',
+            data: {
+                upload_type: req.body.upload_type
+            },
+            file: {
+                file_link: uploadRes.Location,
+                file_key: uploadRes.key,
+            }
+        })
+    } else {
+        res.status(422).json({
+            msg: 'File is missing, please choose a file first'
+        })
+    }
+}
+
+/**
+ * Return S3 Bucket's Directory Name based on the file upload type
+ * @param {string} upload_type 
+ * @returns S3 Bucket's Directory Name
+ */
+const getDirName = (upload_type) => {
+    let dirName;
+    switch (upload_type) {
+        case 'file':
+            dirName = 'dashboard-files/';
+            break;
+
+        case 'profile':
+            dirName = 'user-profile/'
+            break;
+
+        case 'company_logo':
+            dirName = 'company-logo/'
+            break;
+
+        case 'company_video':
+            dirName = 'company-promo-video/'
+            break;
+
+        case 'meeting_logo':
+            dirName = 'meeting-logo/'
+            break;
+
+        case 'meeting_video':
+            dirName = 'meeting-promo-video/'
+            break;
+
+        default:
+            dirName = 'dashboard-files/';
+    }
+    return dirName;
+}
+
+module.exports = { fileUpload };