Example usage for com.amazonaws.services.s3 AmazonS3 getObjectMetadata

Introduction

In this page you can find the example usage for com.amazonaws.services.s3 AmazonS3 getObjectMetadata.

Prototype

public ObjectMetadata getObjectMetadata(String bucketName, String key)
        throws SdkClientException, AmazonServiceException;

Source Link

Document

Gets the metadata for the specified Amazon S3 object without actually fetching the object itself.

Usage

From source file:squash.deployment.lambdas.utils.TransferUtils.java

License:Apache License

/**
 * Adds gzip content-encoding metadata to S3 objects.
 * /*from w ww.  j a  v a2 s . c om*/
 * <p>Adds gzip content-encoding metadata to S3 objects. All objects
 *    beneath the specified prefix (i.e. folder) will have the
 *    metadata added. When the bucket serves objects it will then
 *    add a suitable Content-Encoding header.
 *
 *    @param bucketName the bucket to apply the metadata to.
 *    @param prefix prefix within the bucket, beneath which to apply the metadata.
 *    @param logger a CloudwatchLogs logger.
 */
public static void addGzipContentEncodingMetadata(String bucketName, Optional<String> prefix,
        LambdaLogger logger) {

    // To add new metadata, we must copy each object to itself.
    ListObjectsRequest listObjectsRequest;
    if (prefix.isPresent()) {
        logger.log("Setting gzip content encoding metadata on bucket: " + bucketName + " and prefix: "
                + prefix.get());
        listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName).withPrefix(prefix.get());
    } else {
        logger.log("Setting gzip content encoding metadata on bucket: " + bucketName);
        listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName);
    }

    ObjectListing objectListing;
    AmazonS3 client = TransferManagerBuilder.defaultTransferManager().getAmazonS3Client();
    do {
        objectListing = client.listObjects(listObjectsRequest);
        for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
            String key = objectSummary.getKey();
            logger.log("Setting metadata for S3 object: " + key);
            // We must specify ALL metadata - not just the one we're adding.
            ObjectMetadata objectMetadata = client.getObjectMetadata(bucketName, key);
            objectMetadata.setContentEncoding("gzip");
            CopyObjectRequest copyObjectRequest = new CopyObjectRequest(bucketName, key, bucketName, key)
                    .withNewObjectMetadata(objectMetadata)
                    .withCannedAccessControlList(CannedAccessControlList.PublicRead);
            client.copyObject(copyObjectRequest);
            logger.log("Set metadata for S3 object: " + key);
        }
        listObjectsRequest.setMarker(objectListing.getNextMarker());
    } while (objectListing.isTruncated());
    logger.log("Set gzip content encoding metadata on bucket");
}

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From source file:squash.deployment.lambdas.utils.TransferUtils.java

License:Apache License

/**
 * Adds cache-control header to S3 objects.
 * /*from w  ww.  j  a  va 2  s  .co  m*/
 * <p>Adds cache-control header to S3 objects. All objects
 *    beneath the specified prefix (i.e. folder), and with the
 *    specified extension will have the header added. When the
 *    bucket serves objects it will then add a suitable
 *    Cache-Control header.
 *
 *    @param headerValue value of the cache-control header
 *    @param bucketName the bucket to apply the header to.
 *    @param prefix prefix within the bucket, beneath which to apply the header.
 *    @param extension file extension to apply header to
 *    @param logger a CloudwatchLogs logger.
 */
public static void addCacheControlHeader(String headerValue, String bucketName, Optional<String> prefix,
        String extension, LambdaLogger logger) {

    // To add new metadata, we must copy each object to itself.
    ListObjectsRequest listObjectsRequest;
    if (prefix.isPresent()) {
        logger.log("Setting cache-control metadata: " + headerValue + ", on bucket: " + bucketName
                + " and prefix: " + prefix.get() + " and extension: " + extension);
        listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName).withPrefix(prefix.get());
    } else {
        logger.log("Setting cache-control metadata: " + headerValue + ", on bucket: " + bucketName
                + " and extension: " + extension);
        listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName);
    }

    ObjectListing objectListing;
    AmazonS3 client = TransferManagerBuilder.defaultTransferManager().getAmazonS3Client();
    do {
        objectListing = client.listObjects(listObjectsRequest);
        for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
            String key = objectSummary.getKey();
            if (!key.endsWith(extension)) {
                continue;
            }
            logger.log("Setting metadata for S3 object: " + key);
            // We must specify ALL metadata - not just the one we're adding.
            ObjectMetadata objectMetadata = client.getObjectMetadata(bucketName, key);
            objectMetadata.setCacheControl(headerValue);
            CopyObjectRequest copyObjectRequest = new CopyObjectRequest(bucketName, key, bucketName, key)
                    .withNewObjectMetadata(objectMetadata)
                    .withCannedAccessControlList(CannedAccessControlList.PublicRead);
            client.copyObject(copyObjectRequest);
            logger.log("Set metadata for S3 object: " + key);
        }
        listObjectsRequest.setMarker(objectListing.getNextMarker());
    } while (objectListing.isTruncated());
    logger.log("Set cache-control metadata on bucket");
}

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