Java tutorial
/* * Copyright 2013 Sourabh Ghorpade Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License 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 org.applicationMigrator.migrationclient; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import android.os.Environment; import com.amazonaws.AmazonClientException; import com.amazonaws.AmazonServiceException; import com.amazonaws.auth.AWSCredentials; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3Client; import com.amazonaws.services.s3.model.AmazonS3Exception; import com.amazonaws.services.s3.model.GetObjectRequest; import com.amazonaws.services.s3.model.PutObjectRequest; import com.amazonaws.services.s3.model.S3Object; public class FileTransferClient { private static final String BUCKET_NAME = "application.migrater.bucket"; private String applicationName; private User currentUser; public FileTransferClient(String applicationName, String credentialsFilePath, String ANDROID_ID) throws ClassNotFoundException, IOException { this.applicationName = applicationName; currentUser = new User(ANDROID_ID, credentialsFilePath); } public void downloadFiles(String outputFilesPaths[]) throws IOException, InterruptedException, ClassNotFoundException { if (outputFilesPaths == null) { return; } AWSCredentials awsCredentials = currentUser.getAwsCredentials(); Environment.getExternalStorageDirectory().setReadable(true, false); Environment.getExternalStorageDirectory().setWritable(true, false); for (String outputFilePath : outputFilesPaths) { String fileName = getFileName(outputFilePath); String userName = currentUser.getUserNameString(); String keyNameString = userName + "/" + applicationName + "/" + fileName; AmazonS3 s3client = new AmazonS3Client(awsCredentials); S3Object s3Object = s3client.getObject(new GetObjectRequest(BUCKET_NAME, keyNameString)); try { writeObjectToFile(s3Object, outputFilePath); File outputFile = new File(outputFilePath); outputFile.setReadable(true, false); outputFile.setWritable(true, false); } catch (Exception ignored) { } } } private void writeObjectToFile(S3Object s3Object, String outputFilePath) throws IOException, InterruptedException { InputStream inputStream = null; inputStream = s3Object.getObjectContent(); byte[] buf = new byte[1024]; File outputFile = new File(outputFilePath); outputFile.setReadable(true, false); outputFile.setWritable(true, false); OutputStream outputStream = null; try { outputStream = new FileOutputStream(outputFile); int count; while ((count = inputStream.read(buf)) != -1) { if (Thread.interrupted()) { throw new InterruptedException(); } outputStream.write(buf, 0, count); } } finally { if (outputStream != null) outputStream.close(); if (inputStream != null) inputStream.close(); } } public void uploadFiles(String dataFilesPaths[], boolean forceUpload[]) throws FileNotFoundException, IOException, ClassNotFoundException { AWSCredentials awsCredentials = currentUser.getAwsCredentials(); if (dataFilesPaths == null) { return; } String locationOfFilesString = getLocationString(); for (int currentFileNumber = 0; currentFileNumber < dataFilesPaths.length; currentFileNumber++) { String sourceFilePath = dataFilesPaths[currentFileNumber]; String fileName = getFileName(sourceFilePath); boolean forceUploadCurrentFile = false; if (forceUpload != null && currentFileNumber < forceUpload.length) forceUploadCurrentFile = forceUpload[currentFileNumber]; String destinationFilePath = locationOfFilesString + fileName; uploadFile(awsCredentials, sourceFilePath, destinationFilePath, forceUploadCurrentFile); } } private String getFileName(String filePath) throws FileNotFoundException { String[] splittedStrings = filePath.split("/"); return splittedStrings[splittedStrings.length - 1]; } private String getLocationString() throws IOException { if (applicationName == null) throw new IOException("No Such Attribute"); String userName = currentUser.getUserNameString(); return userName + "/" + applicationName + "/"; } private void uploadFile(AWSCredentials awsCredentials, String sourcePathString, String destinationPathString, boolean forceUpload) throws FileNotFoundException { // TODO Think about one file being used by many apps (e.g HP1.pdf read // through Adobe reader and OpenOffice) AmazonS3 s3client = new AmazonS3Client(awsCredentials); boolean fileIsPresentOnServer = checkIfFileIsPresentOnServer(s3client, BUCKET_NAME, destinationPathString); if (fileIsPresentOnServer && !forceUpload) return; try { File file = new File(sourcePathString); if (!file.exists()) throw new FileNotFoundException(); s3client.putObject(new PutObjectRequest(BUCKET_NAME, destinationPathString, file)); } catch (AmazonServiceException ase) { throw ase; } catch (AmazonClientException ace) { throw ace; } // TODO:verify completion of upload operation } public boolean checkIfFileIsPresentOnServer(AmazonS3 s3Client, String bucketName, String destinationPathString) throws AmazonClientException, AmazonServiceException { boolean isValidFile = true; try { s3Client.getObjectMetadata(bucketName, destinationPathString); } catch (AmazonS3Exception s3e) { if (s3e.getStatusCode() == 403) { isValidFile = false; } else { throw s3e; // rethrow all S3 exceptions other than 404 } } catch (Exception e) { return false; } return isValidFile; } public String getUserName() { return currentUser.getUserNameString(); } }