feat: add method to generate presigned S3 upload URLs

Implemented a `getUploadUrl` method in S3 service to generate presigned URLs for uploading files. Includes support for custom bucket names and expiry times, with error handling and logging.

backend/src/s3/s3.service.ts

@@ -89,6 +89,26 @@ export class S3Service implements OnModuleInit {
 		}
 	}
 
+	async getUploadUrl(
+		fileName: string,
+		expiry = 3600,
+		bucketName: string = this.bucketName,
+	) {
+		try {
+			return await this.minioClient.presignedUrl(
+				"PUT",
+				bucketName,
+				fileName,
+				expiry,
+			);
+		} catch (error) {
+			this.logger.error(
+				`Error getting upload URL for ${bucketName}: ${error.message}`,
+			);
+			throw error;
+		}
+	}
+
 	async deleteFile(fileName: string, bucketName: string = this.bucketName) {
 		try {
 			await this.minioClient.removeObject(bucketName, fileName);