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/*
* Copyright (c) 2012-2019 Snowflake Computing Inc. All rights reserved.
*/
package net.snowflake.client.jdbc.cloud.storage;
import static net.snowflake.client.jdbc.SnowflakeUtil.systemGetProperty;
import com.amazonaws.util.Base64;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.microsoft.azure.storage.*;
import com.microsoft.azure.storage.StorageCredentials;
import com.microsoft.azure.storage.StorageCredentialsAnonymous;
import com.microsoft.azure.storage.StorageCredentialsSharedAccessSignature;
import com.microsoft.azure.storage.StorageException;
import com.microsoft.azure.storage.blob.*;
import com.microsoft.azure.storage.blob.CloudBlobClient;
import com.microsoft.azure.storage.blob.CloudBlobContainer;
import com.microsoft.azure.storage.blob.ListBlobItem;
import java.io.*;
import java.net.SocketTimeoutException;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.InvalidKeyException;
import java.util.*;
import java.util.AbstractMap.SimpleEntry;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.snowflake.client.core.HttpUtil;
import net.snowflake.client.core.ObjectMapperFactory;
import net.snowflake.client.core.SFSession;
import net.snowflake.client.jdbc.*;
import net.snowflake.client.log.SFLogger;
import net.snowflake.client.log.SFLoggerFactory;
import net.snowflake.client.util.SFPair;
import net.snowflake.common.core.RemoteStoreFileEncryptionMaterial;
import net.snowflake.common.core.SqlState;
import org.apache.commons.io.IOUtils;
/**
* Encapsulates the Azure Storage client and all Azure Storage operations and logic
*
* @author lgiakoumakis
*/
public class SnowflakeAzureClient implements SnowflakeStorageClient {
private static final String localFileSep = systemGetProperty("file.separator");
private static final String AZ_ENCRYPTIONDATAPROP = "encryptiondata";
private int encryptionKeySize = 0; // used for PUTs
private StageInfo stageInfo;
private RemoteStoreFileEncryptionMaterial encMat;
private CloudBlobClient azStorageClient;
private static final SFLogger logger = SFLoggerFactory.getLogger(SnowflakeAzureClient.class);
private OperationContext opContext = null;
private SFSession session;
private SnowflakeAzureClient() {}
;
/*
* Factory method for a SnowflakeAzureClient object
* @param stage The stage information that the client will operate on
* @param encMat The encryption material
* required to decrypt/encrypt content in stage
*/
public static SnowflakeAzureClient createSnowflakeAzureClient(
StageInfo stage, RemoteStoreFileEncryptionMaterial encMat, SFSession sfSession)
throws SnowflakeSQLException {
SnowflakeAzureClient azureClient = new SnowflakeAzureClient();
azureClient.setupAzureClient(stage, encMat, sfSession);
return azureClient;
}
/*
* Initializes the Azure client
* This method is used during the object contruction, but also to
* reset/recreate the encapsulated CloudBlobClient object with new
* credentials (after SAS token expiration)
* @param stage The stage information that the client will operate on
* @param encMat The encryption material
* required to decrypt/encrypt content in stage
* @throws IllegalArgumentException when invalid credentials are used
*/
private void setupAzureClient(
StageInfo stage, RemoteStoreFileEncryptionMaterial encMat, SFSession sfSession)
throws IllegalArgumentException, SnowflakeSQLException {
// Save the client creation parameters so that we can reuse them,
// to reset the Azure client.
this.stageInfo = stage;
this.encMat = encMat;
this.session = sfSession;
logger.debug("Setting up the Azure client ");
opContext = new OperationContext();
try {
URI storageEndpoint =
buildAzureStorageEndpointURI(stage.getEndPoint(), stage.getStorageAccount());
StorageCredentials azCreds;
String sasToken = (String) stage.getCredentials().get("AZURE_SAS_TOKEN");
if (sasToken != null) {
// We are authenticated with a shared access token.
azCreds = new StorageCredentialsSharedAccessSignature(sasToken);
} else {
// Use anonymous authentication.
azCreds = StorageCredentialsAnonymous.ANONYMOUS;
}
if (stage.getIsClientSideEncrypted() && encMat != null) {
byte[] decodedKey = Base64.decode(encMat.getQueryStageMasterKey());
encryptionKeySize = decodedKey.length * 8;
if (encryptionKeySize != 128 && encryptionKeySize != 192 && encryptionKeySize != 256) {
throw new SnowflakeSQLLoggedException(
session,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
SqlState.INTERNAL_ERROR,
"unsupported key size",
encryptionKeySize);
}
}
HttpUtil.setProxyForAzure(opContext);
this.azStorageClient = new CloudBlobClient(storageEndpoint, azCreds);
} catch (URISyntaxException ex) {
throw new IllegalArgumentException("invalid_azure_credentials");
}
}
// Returns the Max number of retry attempts
@Override
public int getMaxRetries() {
return 25;
}
// Returns the max exponent for multiplying backoff with the power of 2, the value
// of 4 will give us 16secs as the max number of time to sleep before retry
@Override
public int getRetryBackoffMaxExponent() {
return 4;
}
// Returns the min number of milliseconds to sleep before retry
@Override
public int getRetryBackoffMin() {
return 1000;
}
/** @return Returns true if encryption is enabled */
@Override
public boolean isEncrypting() {
return encryptionKeySize > 0 && this.stageInfo.getIsClientSideEncrypted();
}
/** @return Returns the size of the encryption key */
@Override
public int getEncryptionKeySize() {
return encryptionKeySize;
}
/**
* Re-creates the encapsulated storage client with a fresh access token
*
* @param stageCredentials a Map (as returned by GS) which contains the new credential properties
* @throws SnowflakeSQLException failure to renew the client
*/
@Override
public void renew(Map stageCredentials) throws SnowflakeSQLException {
stageInfo.setCredentials(stageCredentials);
setupAzureClient(stageInfo, encMat, session);
}
/** shuts down the client */
@Override
public void shutdown() {
/* Not available */
}
/**
* For a set of remote storage objects under a remote location and a given prefix/path returns
* their properties wrapped in ObjectSummary objects
*
* @param remoteStorageLocation location, i.e. container for Azure
* @param prefix the prefix/path to list under
* @return a collection of storage summary objects
* @throws StorageProviderException Azure storage exception
*/
@Override
public StorageObjectSummaryCollection listObjects(String remoteStorageLocation, String prefix)
throws StorageProviderException {
StorageObjectSummaryCollection storageObjectSummaries;
try {
CloudBlobContainer container = azStorageClient.getContainerReference(remoteStorageLocation);
Iterable listBlobItemIterable =
container.listBlobs(
prefix, // List the BLOBs under this prefix
true // List the BLOBs as a flat list, i.e. do not list directories
);
storageObjectSummaries = new StorageObjectSummaryCollection(listBlobItemIterable);
} catch (URISyntaxException | StorageException ex) {
logger.debug("Failed to list objects: {}", ex);
throw new StorageProviderException(ex);
}
return storageObjectSummaries;
}
/**
* Returns the metadata properties for a remote storage object
*
* @param remoteStorageLocation location, i.e. bucket for S3
* @param prefix the prefix/path of the object to retrieve
* @return storage metadata object
* @throws StorageProviderException azure storage exception
*/
@Override
public StorageObjectMetadata getObjectMetadata(String remoteStorageLocation, String prefix)
throws StorageProviderException {
CommonObjectMetadata azureObjectMetadata = null;
try {
// Get a reference to the BLOB, to retrieve its metadata
CloudBlobContainer container = azStorageClient.getContainerReference(remoteStorageLocation);
CloudBlob blob = container.getBlockBlobReference(prefix);
blob.downloadAttributes();
// Get the user-defined BLOB metadata
Map userDefinedMetadata = blob.getMetadata();
// Get the BLOB system properties we care about
BlobProperties properties = blob.getProperties();
long contentLength = properties.getLength();
String contentEncoding = properties.getContentEncoding();
// Construct an Azure metadata object
azureObjectMetadata =
new CommonObjectMetadata(contentLength, contentEncoding, userDefinedMetadata);
} catch (StorageException ex) {
logger.debug(
"Failed to retrieve BLOB metadata: {} - {}",
ex.getErrorCode(),
ex.getExtendedErrorInformation());
throw new StorageProviderException(ex);
} catch (URISyntaxException ex) {
logger.debug("Cannot retrieve BLOB properties, invalid URI: {}", ex);
throw new StorageProviderException(ex);
}
return azureObjectMetadata;
}
/**
* Download a file from remote storage.
*
* @param session session object
* @param command command to download file
* @param localLocation local file path
* @param destFileName destination file name
* @param parallelism [ not used by the Azure implementation ]
* @param remoteStorageLocation remote storage location, i.e. bucket for S3
* @param stageFilePath stage file path
* @param stageRegion region name where the stage persists
* @param presignedUrl Unused in Azure
* @throws SnowflakeSQLException download failure
*/
@Override
public void download(
SFSession session,
String command,
String localLocation,
String destFileName,
int parallelism,
String remoteStorageLocation,
String stageFilePath,
String stageRegion,
String presignedUrl)
throws SnowflakeSQLException {
int retryCount = 0;
do {
try {
String localFilePath = localLocation + localFileSep + destFileName;
File localFile = new File(localFilePath);
CloudBlobContainer container = azStorageClient.getContainerReference(remoteStorageLocation);
CloudBlob blob = container.getBlockBlobReference(stageFilePath);
// Note that Azure doesn't offer a multi-part parallel download library,
// where the user has control of block size and parallelism
// we rely on Azure to handle the download, hence the "parallelism" parameter is ignored
// in the Azure implementation of the method
blob.downloadToFile(localFilePath);
// Pull object metadata from Azure
blob.downloadAttributes();
// Get the user-defined BLOB metadata
Map userDefinedMetadata = blob.getMetadata();
AbstractMap.SimpleEntry encryptionData =
parseEncryptionData(userDefinedMetadata.get(AZ_ENCRYPTIONDATAPROP));
String key = encryptionData.getKey();
String iv = encryptionData.getValue();
if (this.isEncrypting() && this.getEncryptionKeySize() <= 256) {
if (key == null || iv == null) {
throw new SnowflakeSQLLoggedException(
session,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
SqlState.INTERNAL_ERROR,
"File metadata incomplete");
}
// Decrypt file
try {
EncryptionProvider.decrypt(localFile, key, iv, this.encMat);
} catch (Exception ex) {
logger.error("Error decrypting file", ex);
throw ex;
}
}
return;
} catch (Exception ex) {
logger.debug("Download unsuccessful {}", ex);
handleAzureException(ex, ++retryCount, "download", session, command, this);
}
} while (retryCount <= getMaxRetries());
throw new SnowflakeSQLLoggedException(
session,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
SqlState.INTERNAL_ERROR,
"Unexpected: download unsuccessful without exception!");
}
/**
* Download a file from remote storage
*
* @param session session object
* @param command command to download file
* @param parallelism number of threads for parallel downloading
* @param remoteStorageLocation remote storage location, i.e. bucket for s3
* @param stageFilePath stage file path
* @param stageRegion region name where the stage persists
* @param presignedUrl Unused in Azure
* @return input file stream
* @throws SnowflakeSQLException when download failure
*/
@Override
public InputStream downloadToStream(
SFSession session,
String command,
int parallelism,
String remoteStorageLocation,
String stageFilePath,
String stageRegion,
String presignedUrl)
throws SnowflakeSQLException {
int retryCount = 0;
do {
try {
CloudBlobContainer container = azStorageClient.getContainerReference(remoteStorageLocation);
CloudBlob blob = container.getBlockBlobReference(stageFilePath);
InputStream stream = blob.openInputStream();
Map userDefinedMetadata = blob.getMetadata();
AbstractMap.SimpleEntry encryptionData =
parseEncryptionData(userDefinedMetadata.get(AZ_ENCRYPTIONDATAPROP));
String key = encryptionData.getKey();
String iv = encryptionData.getValue();
if (this.isEncrypting() && this.getEncryptionKeySize() <= 256) {
if (key == null || iv == null) {
throw new SnowflakeSQLLoggedException(
session,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
SqlState.INTERNAL_ERROR,
"File metadata incomplete");
}
try {
return EncryptionProvider.decryptStream(stream, key, iv, encMat);
} catch (Exception ex) {
logger.error("Error in decrypting file", ex);
throw ex;
}
} else {
return stream;
}
} catch (Exception ex) {
logger.debug("Downloading unsuccessful {}", ex);
handleAzureException(ex, ++retryCount, "download", session, command, this);
}
} while (retryCount < getMaxRetries());
throw new SnowflakeSQLLoggedException(
session,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
SqlState.INTERNAL_ERROR,
"Unexpected: download unsuccessful without exception!");
}
/**
* Upload a file/stream to remote storage
*
* @param session session object
* @param command upload command
* @param parallelism [ not used by the Azure implementation ]
* @param uploadFromStream true if upload source is stream
* @param remoteStorageLocation storage container name
* @param srcFile source file if not uploading from a stream
* @param destFileName file name on remote storage after upload
* @param inputStream stream used for uploading if fileBackedOutputStream is null
* @param fileBackedOutputStream stream used for uploading if not null
* @param meta object meta data
* @param stageRegion region name where the stage persists
* @param presignedUrl Unused in Azure
* @throws SnowflakeSQLException if upload failed even after retry
*/
@Override
public void upload(
SFSession session,
String command,
int parallelism,
boolean uploadFromStream,
String remoteStorageLocation,
File srcFile,
String destFileName,
InputStream inputStream,
FileBackedOutputStream fileBackedOutputStream,
StorageObjectMetadata meta,
String stageRegion,
String presignedUrl)
throws SnowflakeSQLException {
final List toClose = new ArrayList<>();
long originalContentLength = meta.getContentLength();
SFPair uploadStreamInfo =
createUploadStream(
srcFile,
uploadFromStream,
inputStream,
meta,
originalContentLength,
fileBackedOutputStream,
toClose);
if (!(meta instanceof CommonObjectMetadata)) {
throw new IllegalArgumentException("Unexpected metadata object type");
}
int retryCount = 0;
do {
try {
logger.debug("Starting upload");
InputStream fileInputStream = uploadStreamInfo.left;
CloudBlobContainer container = azStorageClient.getContainerReference(remoteStorageLocation);
CloudBlockBlob blob = container.getBlockBlobReference(destFileName);
// Set the user-defined/Snowflake metadata and upload the BLOB
blob.setMetadata((HashMap) meta.getUserMetadata());
// Note that Azure doesn't offer a multi-part parallel upload library,
// where the user has control of block size and parallelism
// we rely on Azure to handle the upload, hence the "parallelism" parameter is ignored
// in the Azure implementation of the method
blob.upload(
fileInputStream, // input stream to upload from
-1 // -1 indicates an unknown stream length
);
logger.debug("Upload successful");
blob.uploadMetadata();
// close any open streams in the "toClose" list and return
for (FileInputStream is : toClose) IOUtils.closeQuietly(is);
return;
} catch (Exception ex) {
handleAzureException(ex, ++retryCount, "upload", session, command, this);
if (uploadFromStream && fileBackedOutputStream == null) {
throw new SnowflakeSQLException(
ex,
SqlState.SYSTEM_ERROR,
ErrorCode.IO_ERROR.getMessageCode(),
"Encountered exception during upload: "
+ ex.getMessage()
+ "\nCannot retry upload from stream.");
}
uploadStreamInfo =
createUploadStream(
srcFile,
uploadFromStream,
inputStream,
meta,
originalContentLength,
fileBackedOutputStream,
toClose);
}
} while (retryCount <= getMaxRetries());
for (FileInputStream is : toClose) IOUtils.closeQuietly(is);
throw new SnowflakeSQLException(
SqlState.INTERNAL_ERROR,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
"Unexpected: upload unsuccessful without exception!");
}
/**
* Handles exceptions thrown by Azure Storage
*
* @param ex the exception to handle
* @param retryCount current number of retries, incremented by the caller before each call
* @param operation string that indicates the function/operation that was taking place, when the
* exception was raised, for example "upload"
* @param session the current SFSession object used by the client
* @param command the command attempted at the time of the exception
* @throws SnowflakeSQLException exceptions not handled
*/
@Override
public void handleStorageException(
Exception ex, int retryCount, String operation, SFSession session, String command)
throws SnowflakeSQLException {
handleAzureException(ex, retryCount, operation, session, command, this);
}
private SFPair createUploadStream(
File srcFile,
boolean uploadFromStream,
InputStream inputStream,
StorageObjectMetadata meta,
long originalContentLength,
FileBackedOutputStream fileBackedOutputStream,
List toClose)
throws SnowflakeSQLException {
logger.debug(
"createUploadStream({}, {}, {}, {}, {}, {})",
this,
srcFile,
uploadFromStream,
inputStream,
fileBackedOutputStream,
toClose);
final InputStream stream;
FileInputStream srcFileStream = null;
try {
if (isEncrypting() && getEncryptionKeySize() < 256) {
try {
final InputStream uploadStream =
uploadFromStream
? (fileBackedOutputStream != null
? fileBackedOutputStream.asByteSource().openStream()
: inputStream)
: (srcFileStream = new FileInputStream(srcFile));
toClose.add(srcFileStream);
// Encrypt
stream =
EncryptionProvider.encrypt(
meta, originalContentLength, uploadStream, this.encMat, this);
uploadFromStream = true;
} catch (Exception ex) {
logger.error("Failed to encrypt input", ex);
throw new SnowflakeSQLLoggedException(
session,
SqlState.INTERNAL_ERROR,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
ex,
"Failed to encrypt input",
ex.getMessage());
}
} else {
if (uploadFromStream) {
if (fileBackedOutputStream != null) {
stream = fileBackedOutputStream.asByteSource().openStream();
} else {
stream = inputStream;
}
} else {
srcFileStream = new FileInputStream(srcFile);
toClose.add(srcFileStream);
stream = srcFileStream;
}
}
} catch (FileNotFoundException ex) {
logger.error("Failed to open input file", ex);
throw new SnowflakeSQLLoggedException(
session,
SqlState.INTERNAL_ERROR,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
ex,
"Failed to open input file",
ex.getMessage());
} catch (IOException ex) {
logger.error("Failed to open input stream", ex);
throw new SnowflakeSQLLoggedException(
session,
SqlState.INTERNAL_ERROR,
ErrorCode.INTERNAL_ERROR.getMessageCode(),
ex,
"Failed to open input stream",
ex.getMessage());
}
return SFPair.of(stream, uploadFromStream);
}
/**
* Handles exceptions thrown by Azure Storage It will retry transient errors as defined by the
* Azure Client retry policy It will re-create the client if the SAS token has expired, and re-try
*
* @param ex the exception to handle
* @param retryCount current number of retries, incremented by the caller before each call
* @param operation string that indicates the function/operation that was taking place, when the
* exception was raised, for example "upload"
* @param session the current SFSession object used by the client
* @param command the command attempted at the time of the exception
* @param azClient the current Snowflake Azure client object
* @throws SnowflakeSQLException exceptions not handled
*/
private static void handleAzureException(
Exception ex,
int retryCount,
String operation,
SFSession session,
String command,
SnowflakeAzureClient azClient)
throws SnowflakeSQLException {
// no need to retry if it is invalid key exception
if (ex.getCause() instanceof InvalidKeyException) {
// Most likely cause is that the unlimited strength policy files are not installed
// Log the error and throw a message that explains the cause
SnowflakeFileTransferAgent.throwJCEMissingError(operation, ex);
}
if (ex instanceof StorageException) {
StorageException se = (StorageException) ex;
if (((StorageException) ex).getHttpStatusCode() == 403) {
// A 403 indicates that the SAS token has expired,
// we need to refresh the Azure client with the new token
SnowflakeFileTransferAgent.renewExpiredToken(session, command, azClient);
}
// If we have exceeded the max number of retries, propagate the error
if (retryCount > azClient.getMaxRetries()) {
throw new SnowflakeSQLLoggedException(
session,
SqlState.SYSTEM_ERROR,
ErrorCode.AZURE_SERVICE_ERROR.getMessageCode(),
se,
operation,
se.getErrorCode(),
se.getHttpStatusCode(),
se.getMessage(),
se.getExtendedErrorInformation());
} else {
logger.debug(
"Encountered exception ({}) during {}, retry count: {}",
ex.getMessage(),
operation,
retryCount);
logger.debug("Stack trace: ", ex);
// exponential backoff up to a limit
int backoffInMillis = azClient.getRetryBackoffMin();
if (retryCount > 1) {
backoffInMillis <<= (Math.min(retryCount - 1, azClient.getRetryBackoffMaxExponent()));
}
try {
logger.debug("Sleep for {} milliseconds before retry", backoffInMillis);
Thread.sleep(backoffInMillis);
} catch (InterruptedException ex1) {
// ignore
}
if (se.getHttpStatusCode() == 403) {
// A 403 indicates that the SAS token has expired,
// we need to refresh the Azure client with the new token
SnowflakeFileTransferAgent.renewExpiredToken(session, command, azClient);
}
}
} else {
if (ex instanceof InterruptedException
|| SnowflakeUtil.getRootCause(ex) instanceof SocketTimeoutException) {
if (retryCount > azClient.getMaxRetries()) {
throw new SnowflakeSQLLoggedException(
session,
SqlState.SYSTEM_ERROR,
ErrorCode.IO_ERROR.getMessageCode(),
ex,
"Encountered exception during " + operation + ": " + ex.getMessage());
} else {
logger.debug(
"Encountered exception ({}) during {}, retry count: {}",
ex.getMessage(),
operation,
retryCount);
}
} else {
throw new SnowflakeSQLLoggedException(
session,
SqlState.SYSTEM_ERROR,
ErrorCode.IO_ERROR.getMessageCode(),
ex,
"Encountered exception during " + operation + ": " + ex.getMessage());
}
}
}
/*
* Builds a URI to a Azure Storage account endpoint
*
* @param storageEndPoint the storage endpoint name
* @param storageAccount the storage account name
*/
private static URI buildAzureStorageEndpointURI(String storageEndPoint, String storageAccount)
throws URISyntaxException {
URI storageEndpoint =
new URI("https", storageAccount + "." + storageEndPoint + "/", null, null);
return storageEndpoint;
}
/*
* buildEncryptionMetadataJSON
* Takes the base64-encoded iv and key and creates the JSON block to be
* used as the encryptiondata metadata field on the blob.
*/
private String buildEncryptionMetadataJSON(String iv64, String key64) {
return String.format(
"{\"EncryptionMode\":\"FullBlob\",\"WrappedContentKey\""
+ ":{\"KeyId\":\"symmKey1\",\"EncryptedKey\":\"%s\""
+ ",\"Algorithm\":\"AES_CBC_256\"},\"EncryptionAgent\":"
+ "{\"Protocol\":\"1.0\",\"EncryptionAlgorithm\":"
+ "\"AES_CBC_256\"},\"ContentEncryptionIV\":\"%s\""
+ ",\"KeyWrappingMetadata\":{\"EncryptionLibrary\":"
+ "\"Java 5.3.0\"}}",
key64, iv64);
}
/*
* parseEncryptionData
* Takes the json string in the encryptiondata metadata field of the encrypted
* blob and parses out the key and iv. Returns the pair as key = key, iv = value.
*/
private SimpleEntry parseEncryptionData(String jsonEncryptionData)
throws SnowflakeSQLException {
ObjectMapper mapper = ObjectMapperFactory.getObjectMapper();
JsonFactory factory = mapper.getFactory();
try {
JsonParser parser = factory.createParser(jsonEncryptionData);
JsonNode encryptionDataNode = mapper.readTree(parser);
String iv = encryptionDataNode.get("ContentEncryptionIV").asText();
String key = encryptionDataNode.get("WrappedContentKey").get("EncryptedKey").asText();
return new SimpleEntry(key, iv);
} catch (Exception ex) {
throw new SnowflakeSQLLoggedException(
session,
SqlState.SYSTEM_ERROR,
ErrorCode.IO_ERROR.getMessageCode(),
ex,
"Error parsing encryption data as json" + ": " + ex.getMessage());
}
}
/** Returns the material descriptor key */
@Override
public String getMatdescKey() {
return "matdesc";
}
/** Adds encryption metadata to the StorageObjectMetadata object */
@Override
public void addEncryptionMetadata(
StorageObjectMetadata meta,
MatDesc matDesc,
byte[] ivData,
byte[] encKeK,
long contentLength) {
meta.addUserMetadata(getMatdescKey(), matDesc.toString());
meta.addUserMetadata(
AZ_ENCRYPTIONDATAPROP,
buildEncryptionMetadataJSON(Base64.encodeAsString(ivData), Base64.encodeAsString(encKeK)));
meta.setContentLength(contentLength);
}
/** Adds digest metadata to the StorageObjectMetadata object */
@Override
public void addDigestMetadata(StorageObjectMetadata meta, String digest) {
if (!SnowflakeUtil.isBlank(digest)) {
// Azure doesn't allow hyphens in the name of a metadata field.
meta.addUserMetadata("sfcdigest", digest);
}
}
/** Gets digest metadata to the StorageObjectMetadata object */
@Override
public String getDigestMetadata(StorageObjectMetadata meta) {
return meta.getUserMetadata().get("sfcdigest");
}
}
