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app/utils/s3Upload.utill.js

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+/**
+ * Copyright (c) 2026 Niolla
+ * All rights reserved.
+ *
+ * This source code is proprietary and confidential.
+ * Unauthorized copying, modification, distribution, or use
+ * of this file, via any medium, is strictly prohibited.
+ */
+
+// app/utils/s3Upload.util.js
+
+const { PutObjectCommand, GetObjectCommand } = require("@aws-sdk/client-s3");
+
+const { getSignedUrl } = require("@aws-sdk/s3-request-presigner");
+const s3 = require("../config/s3.config");
+const { v4: uuidv4 } = require("uuid");
+const path = require("path");
+const createRedisConnection = require("../config/redis.config");
+const redis = createRedisConnection();
+const { log } = require("./consoleLog.utill");
+
+// Upload + return key (BEST PRACTICE)
+const uploadToS3 = async (file, usedFor) => {
+  try {
+    const fileExtension = path.extname(file.originalname);
+    const fileName = `${uuidv4()}${fileExtension}`;
+    let key = `uploads/${fileName}`;
+
+    if (usedFor === "asset") {
+      key = `assets/${fileName}`;
+    } 
+
+    log("Uploading file to S3 with key:", key);
+
+    const params = {
+      Bucket: process.env.AWS_S3_BUCKET_NAME,
+      Key: key,
+      Body: file.buffer,
+      ContentType: file.mimetype,
+    };
+
+    await s3.send(new PutObjectCommand(params));
+
+    // Return KEY (not URL)
+    return key;
+  } catch (error) {
+    log("S3 Upload Error:", error);
+    throw new Error("File upload failed");
+  }
+};
+
+// Generate signed URL with Redis caching
+const getSignedFileUrl = async (key) => {
+  try {
+    const cacheKey = `s3:url:${key}`;
+
+    // 1. Check cache
+    const cachedUrl = await redis.get(cacheKey);
+
+    if (cachedUrl) {
+      log("⚡ Cache HIT - returning signed URL from Redis");
+      return cachedUrl;
+    }
+
+    log("🐢 Cache MISS - generating new signed URL");
+
+    // 2. Generate signed URL
+    const command = new GetObjectCommand({
+      Bucket: process.env.AWS_S3_BUCKET_NAME,
+      Key: key,
+    });
+
+    const signedUrl = await getSignedUrl(s3, command, {
+      expiresIn: 3600, // 1 hour
+    });
+
+    // 3. Store in Redis (TTL: 55 minutes)
+    await redis.set(cacheKey, signedUrl, "EX", 3300);
+
+    return signedUrl;
+  } catch (error) {
+    log("Signed URL Error:", error);
+    throw new Error("Failed to generate file URL");
+  }
+};
+
+module.exports = {
+  uploadToS3,
+  getSignedFileUrl,
+};