Implementation: S3 document upload

Author: akshaykumar059004

configs/s3_config.js

@@ -0,0 +1,12 @@
+const { S3Client} = require("@aws-sdk/client-s3");
+require("dotenv").config();
+
+const s3 = new S3Client({
+  region: process.env.AWS_REGION , // Your AWS region
+  credentials : { 
+    accessKeyId: process.env.AWS_ACCESS_KEY_ID, // Your AWS access key ID
+    secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY, // Your AWS secret access key
+  }
+});
+
+exports.s3 = s3; // Export the S3 client for use in other files

controllers/s3fileurl.controller.js

@@ -0,0 +1,49 @@
+const { GetObjectCommand, PutObjectCommand } = require("@aws-sdk/client-s3");
+const { getSignedUrl } = require("@aws-sdk/s3-request-presigner");
+require("dotenv").config();
+const asyncHandler = require("../middlewares/asyncHandler");
+const { s3 } = require("../configs/s3_config"); // Import the S3 client from config.js
+
+const Bucket = process.env.AWS_BUCKET_NAME; // Your S3 bucket name
+//const Key ='farmpond4.pdf';
+const Expires = 90; // URL valid for 60 seconds
+const ContentType = 'application/pdf'; // Set the content type to PDF
+
+ //get-upload url
+ exports.getUploadUrl = asyncHandler(async (req, res) => {
+    const Key = req.query.fileName;
+    if (!Key) {
+        return res.status(400).json({ error: "Missing 'fileName' in query params" });
+      }
+      
+    console.log(Key);
+
+
+  const command = new PutObjectCommand({Bucket, Key, ContentType});
+  try {
+    const uploadURL = await getSignedUrl(s3,command, {Expires});
+    //console.log('Upload URL (Server):', uploadURL);
+    //return uploadURL;
+    res.json(uploadURL);
+   
+  } catch (error) {
+    console.error('Error generating presigned URL', error);
+    //res.status(500).send('Error generating presigned URL');
+    throw error;
+  }
+});
+
+//get-download url
+exports.getDownloadUrl = asyncHandler( async (req, res) => {
+    const Key = req.query.fileName;
+  const command = new GetObjectCommand({ Bucket, Key });
+  try {
+    const downloadURL = await getSignedUrl(s3, command, { Expires });
+    //console.log('Download URL (Server):', downloadURL);
+    res.json(downloadURL);
+  } catch (error) {
+    console.error('Error generating presigned URL', error);
+    //res.status(500).send('Error generating presigned URL');
+    throw error;
+  }
+});

index.js

@@ -19,6 +19,9 @@ app.use('/api/dashboard', dashboardRoutes);
 const formDataRoutes = require('./routes/formData.route');
 app.use('/api/formData', formDataRoutes);
 
+const fileRoutes = require('./routes/files.route');
+app.use('/api/files',fileRoutes);
+
 app.get("/", (req, res) => {
     res.send("✅ Backend is running and ready!");
   });