kristofer / S3 Access (java, Python)

import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3ClientBuilder; import com.amazonaws.services.s3.model.*; import java.io.File; public class S3Examples { private final AmazonS3 s3 = AmazonS3ClientBuilder.defaultClient(); // Create an S3 bucket public void createBucket(String bucketName) { s3.createBucket(bucketName); } // Upload an object to S3 public void uploadObject(String bucketName, String key, File file) { s3.putObject(bucketName, key, file); } // Download an object from S3 public void downloadObject(String bucketName, String key, File file) { s3.getObject(new GetObjectRequest(bucketName, key), file); } // List objects in a bucket public ObjectListing listObjects(String bucketName) { return s3.listObjects(bucketName); } // Generate pre-signed URL to share an S3 object public URL generatePresignedUrl(String bucketName, String key) { Date expiration = new Date(); long expTimeMillis = expiration.getTime(); expTimeMillis += 1000 * 60 * 60; // Add 1 hour. expiration.setTime(expTimeMillis); GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(bucketName, key) .withMethod(HttpMethod.GET) .withExpiration(expiration); return s3.generatePresignedUrl(generatePresignedUrlRequest); } } // The key steps are: // 1. Create an S3Client object to interact with S3 // 2. Call createBucket() to create a new S3 bucket // 3. Upload objects using putObject(), specifying bucket name, key, and file // 4. Download objects using getObject(), specifying bucket name, key, and target file // 5. List objects in a bucket using listObjects() // 6. Generate a pre-signed URL using generatePresignedUrl() by specifying bucket, // key, expiration date, and HTTP method. // The pre-signed URL allows temporary access to private S3 objects without requiring AWS credentials. // The URL is only valid until the specified expiration date/time.

import boto3 from botocore.exceptions import ClientError s3 = boto3.client('s3') # Create a bucket bucket_name = 'my-bucket' location = {'LocationConstraint':'us-east-1'} s3.create_bucket(Bucket=bucket_name, CreateBucketConfiguration=location) # Upload an object to bucket filename = 'data.csv' object_name = 'data/data.csv' s3.upload_file(filename, bucket_name, object_name) # List objects in bucket response = s3.list_objects(Bucket=bucket_name) for object in response['Contents']: print(object['Key']) # Download an object s3.download_file(bucket_name, object_name, 'data_download.csv') # Generate pre-signed URL to share an object url = s3.generate_presigned_url( ClientMethod='get_object', Params={'Bucket': bucket_name, 'Key': object_name}, ExpiresIn=3600) print(url) # This creates an S3 bucket, uploads a local CSV file to the bucket under object name 'data/data.csv', # lists all objects in the bucket, downloads the object to a local file, and generates a pre-signed URL # that allows temporary access to download the object for anyone with the URL. # The pre-signed URL expires after 3600 seconds (1 hour).