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The AWS Android SDK for Amazon S3 module holds the client classes that are used for communicating with Amazon Simple Storage Service
/*
* Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Portions copyright 2006-2009 James Murty. Please see LICENSE.txt
* for applicable license terms and NOTICE.txt for applicable notices.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.services.s3.internal;
import static com.amazonaws.util.StringUtils.UTF8;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.SocketException;
import java.net.URL;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import javax.net.ssl.SSLProtocolException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.amazonaws.AmazonClientException;
import com.amazonaws.Request;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.util.BinaryUtils;
import com.amazonaws.util.DateUtils;
import com.amazonaws.util.HttpUtils;
import com.amazonaws.util.Md5Utils;
/**
* General utility methods used throughout the AWS S3 Java client.
*/
public class ServiceUtils {
private static final Log log = LogFactory.getLog(ServiceUtils.class);
public static final boolean APPEND_MODE = true;
public static final boolean OVERWRITE_MODE = false;
@Deprecated
protected static final DateUtils dateUtils = new DateUtils();
public static Date parseIso8601Date(String dateString) {
return DateUtils.parseISO8601Date(dateString);
}
public static String formatIso8601Date(Date date) {
return DateUtils.formatISO8601Date(date);
}
public static Date parseRfc822Date(String dateString) {
return DateUtils.parseRFC822Date(dateString);
}
public static String formatRfc822Date(Date date) {
return DateUtils.formatRFC822Date(date);
}
/**
* Returns true if the specified ETag was from a multipart upload.
*
* @param eTag
* The ETag to test.
*
* @return True if the specified ETag was from a multipart upload, otherwise
* false it if belongs to an object that was uploaded in a single
* part.
*/
public static boolean isMultipartUploadETag(String eTag) {
return eTag.contains("-");
}
/**
* Safely converts a string to a byte array, first attempting to explicitly
* use our preferred encoding (UTF-8), and then falling back to the
* platform's default encoding if for some reason our preferred encoding
* isn't supported.
*
* @param s
* The string to convert to a byte array.
*
* @return The byte array contents of the specified string.
*/
public static byte[] toByteArray(String s) {
return s.getBytes(UTF8);
}
/**
* Removes any surrounding quotes from the specified string and returns a
* new string.
*
* @param s
* The string to check for surrounding quotes.
*
* @return A new string created from the specified string, minus any
* surrounding quotes.
*/
public static String removeQuotes(String s) {
if (s == null) return null;
s = s.trim();
if (s.startsWith("\"")) s = s.substring(1);
if (s.endsWith("\"")) s = s.substring(0, s.length() - 1);
return s;
}
/**
* Converts the specified request object into a URL, containing all the
* specified parameters, the specified request endpoint, etc.
*
* @param request
* The request to convert into a URL.
* @return A new URL representing the specified request.
*
* @throws AmazonClientException
* If the request cannot be converted to a well formed URL.
*/
public static URL convertRequestToUrl(Request request) {
// To be backward compatible, this method by default does not
// remove the leading slash in the request resource-path.
return convertRequestToUrl(request, false);
}
/**
* Converts the specified request object into a URL, containing all the
* specified parameters, the specified request endpoint, etc.
*
* @param request
* The request to convert into a URL.
* @param removeLeadingSlashInResourcePath
* Whether the leading slash in resource-path should be removed
* before appending to the endpoint.
* @return A new URL representing the specified request.
*
* @throws AmazonClientException
* If the request cannot be converted to a well formed URL.
*/
public static URL convertRequestToUrl(Request request, boolean removeLeadingSlashInResourcePath) {
String resourcePath = HttpUtils.urlEncode(request.getResourcePath(), true);
// Removed the padding "/" that was already added into the request's resource path.
if (removeLeadingSlashInResourcePath
&& resourcePath.startsWith("/")) {
resourcePath = resourcePath.substring(1);
}
// Some http client libraries (e.g. Apache HttpClient) cannot handle
// consecutive "/"s between URL authority and path components.
// So we escape "////..." into "/%2F%2F%2F...", in the same way as how
// we treat consecutive "/"s in AmazonS3Client#presignRequest(...)
String urlPath = "/" + resourcePath;
urlPath = urlPath.replaceAll("(?<=/)/", "%2F");
String urlString = request.getEndpoint() + urlPath;
boolean firstParam = true;
for (String param : request.getParameters().keySet()) {
if (firstParam) {
urlString += "?";
firstParam = false;
} else {
urlString += "&";
}
String value = request.getParameters().get(param);
urlString += param + "=" + HttpUtils.urlEncode(value, false);
}
try {
return new URL(urlString);
} catch (MalformedURLException e) {
throw new AmazonClientException(
"Unable to convert request to well formed URL: " + e.getMessage(), e);
}
}
/**
* Returns a new string created by joining each of the strings in the
* specified list together, with a comma between them.
*
* @param strings
* The list of strings to join into a single, comma delimited
* string list.
* @return A new string created by joining each of the strings in the
* specified list together, with a comma between strings.
*/
public static String join(List strings) {
String result = "";
boolean first = true;
for (String s : strings) {
if (!first) result += ", ";
result += s;
first = false;
}
return result;
}
/**
* Downloads an S3Object, as returned from
* {@link AmazonS3Client#getObject(com.amazonaws.services.s3.model.GetObjectRequest)},
* to the specified file.
*
* @param s3Object
* The S3Object containing a reference to an InputStream
* containing the object's data.
* @param destinationFile
* The file to store the object's data in.
* @param performIntegrityCheck
* Boolean valuable to indicate whether to perform integrity check
* @param appendData
* appends the data to end of the file.
*
*/
public static void downloadObjectToFile(S3Object s3Object,
File destinationFile, boolean performIntegrityCheck,
boolean appendData) {
// attempt to create the parent if it doesn't exist
File parentDirectory = destinationFile.getParentFile();
if ( parentDirectory != null && !parentDirectory.exists() ) {
parentDirectory.mkdirs();
}
OutputStream outputStream = null;
try {
outputStream = new BufferedOutputStream(new FileOutputStream(
destinationFile, appendData));
byte[] buffer = new byte[1024*10];
int bytesRead;
while ((bytesRead = s3Object.getObjectContent().read(buffer)) > -1) {
outputStream.write(buffer, 0, bytesRead);
}
} catch (IOException e) {
s3Object.getObjectContent().abort();
throw new AmazonClientException(
"Unable to store object contents to disk: " + e.getMessage(), e);
} finally {
try {outputStream.close();} catch (Exception e) {}
try {s3Object.getObjectContent().close();} catch (Exception e) {}
}
byte[] clientSideHash = null;
byte[] serverSideHash = null;
try {
// Multipart Uploads don't have an MD5 calculated on the service side
if (ServiceUtils.isMultipartUploadETag(s3Object.getObjectMetadata().getETag()) == false) {
clientSideHash = Md5Utils.computeMD5Hash(new FileInputStream(destinationFile));
serverSideHash = BinaryUtils.fromHex(s3Object.getObjectMetadata().getETag());
}
} catch (Exception e) {
log.warn("Unable to calculate MD5 hash to validate download: " + e.getMessage(), e);
}
if (performIntegrityCheck && clientSideHash != null && serverSideHash != null && !Arrays.equals(clientSideHash, serverSideHash)) {
throw new AmazonClientException("Unable to verify integrity of data download. " +
"Client calculated content hash didn't match hash calculated by Amazon S3. " +
"The data stored in '" + destinationFile.getAbsolutePath() + "' may be corrupt.");
}
}
/**
* Interface for the task of downloading object from S3 to a specific file,
* enabling one-time retry mechanism after integrity check failure
* on the downloaded file.
*/
public interface RetryableS3DownloadTask {
/**
* User defines how to get the S3Object from S3 for this RetryableS3DownloadTask.
*
* @return
* The S3Object containing a reference to an InputStream
* containing the object's data.
*/
public S3Object getS3ObjectStream ();
/**
* User defines whether integrity check is needed for this RetryableS3DownloadTask.
*
* @return
* Boolean value indicating whether this task requires integrity check
* after downloading the S3 object to file.
*/
public boolean needIntegrityCheck ();
}
/**
* Gets an object stored in S3 and downloads it into the specified file.
* This method includes the one-time retry mechanism after integrity check failure
* on the downloaded file. It will also return immediately after getting null valued
* S3Object (when getObject request does not meet the specified constraints).
*
* @param file
* The file to store the object's data in.
* @param safeS3DownloadTask
* The implementation of SafeS3DownloadTask interface which allows user to
* get access to all the visible variables at the calling site of this method.
*/
public static S3Object retryableDownloadS3ObjectToFile(File file,
RetryableS3DownloadTask retryableS3DownloadTask, boolean appendData) {
boolean hasRetried = false;
boolean needRetry;
S3Object s3Object;
do {
needRetry = false;
s3Object = retryableS3DownloadTask.getS3ObjectStream();
if ( s3Object == null )
return null;
try {
ServiceUtils.downloadObjectToFile(s3Object, file,
retryableS3DownloadTask.needIntegrityCheck(),
appendData);
} catch (AmazonClientException ace) {
if (!ace.isRetryable())
throw ace;
// Determine whether an immediate retry is needed according to the captured AmazonClientException.
// (There are three cases when downloadObjectToFile() throws AmazonClientException:
// 1) SocketException or SSLProtocolException when writing to disk (e.g. when user aborts the download)
// 2) Other IOException when writing to disk
// 3) MD5 hashes don't match
// The current code will retry the download only when case 2) or 3) happens.
if (ace.getCause() instanceof SocketException || ace.getCause() instanceof SSLProtocolException) {
throw ace;
} else {
needRetry = true;
if ( hasRetried )
throw ace;
else {
log.info("Retry the download of object " + s3Object.getKey() + " (bucket " + s3Object.getBucketName() + ")", ace);
hasRetried = true;
}
}
} finally {
s3Object.getObjectContent().abort();
}
} while ( needRetry );
return s3Object;
}
}