| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * 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 com.android.utils.blob; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import android.app.blob.BlobHandle; |
| import android.app.blob.BlobStoreManager; |
| import android.content.Context; |
| import android.os.FileUtils; |
| import android.os.ParcelFileDescriptor; |
| |
| import java.io.BufferedInputStream; |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.RandomAccessFile; |
| import java.nio.file.Files; |
| import java.security.MessageDigest; |
| import java.util.Random; |
| import java.util.concurrent.TimeUnit; |
| |
| public class DummyBlobData { |
| private static final long DEFAULT_SIZE_BYTES = 10 * 1024L * 1024L; |
| private static final int BUFFER_SIZE_BYTES = 16 * 1024; |
| |
| private final Context mContext; |
| private final Random mRandom; |
| private final File mFile; |
| private final long mFileSize; |
| private final String mLabel; |
| |
| byte[] mFileDigest; |
| long mExpiryTimeMs; |
| |
| public DummyBlobData(Context context) { |
| this(context, new Random(0), "blob_" + System.nanoTime()); |
| } |
| |
| public DummyBlobData(Context context, long fileSize) { |
| this(context, fileSize, new Random(0), "blob_" + System.nanoTime(), "Test label"); |
| } |
| |
| public DummyBlobData(Context context, Random random, String fileName) { |
| this(context, DEFAULT_SIZE_BYTES, random, fileName, "Test label"); |
| } |
| |
| public DummyBlobData(Context context, Random random, String fileName, String label) { |
| this(context, DEFAULT_SIZE_BYTES, random, fileName, label); |
| } |
| |
| public DummyBlobData(Context context, long fileSize, Random random, String fileName, |
| String label) { |
| mContext = context; |
| mRandom = random; |
| mFile = new File(mContext.getFilesDir(), fileName); |
| mFileSize = fileSize; |
| mLabel = label; |
| } |
| |
| public void prepare() throws Exception { |
| try (RandomAccessFile file = new RandomAccessFile(mFile, "rw")) { |
| writeRandomData(file, mFileSize); |
| } |
| mFileDigest = FileUtils.digest(mFile, "SHA-256"); |
| mExpiryTimeMs = System.currentTimeMillis() + TimeUnit.DAYS.toMillis(1); |
| } |
| |
| public BlobHandle getBlobHandle() throws Exception { |
| return BlobHandle.createWithSha256(createSha256Digest(mFile), mLabel, |
| mExpiryTimeMs, "test_tag"); |
| } |
| |
| public long getFileSize() throws Exception { |
| return mFileSize; |
| } |
| |
| public long getExpiryTimeMillis() { |
| return mExpiryTimeMs; |
| } |
| |
| public void delete() { |
| mFile.delete(); |
| } |
| |
| public void writeToSession(BlobStoreManager.Session session) throws Exception { |
| writeToSession(session, 0, mFileSize); |
| } |
| |
| public void writeToSession(BlobStoreManager.Session session, |
| long offsetBytes, long lengthBytes) throws Exception { |
| try (FileInputStream in = new FileInputStream(mFile)) { |
| in.getChannel().position(offsetBytes); |
| try (FileOutputStream out = new ParcelFileDescriptor.AutoCloseOutputStream( |
| session.openWrite(offsetBytes, lengthBytes))) { |
| copy(in, out, lengthBytes); |
| } |
| } |
| } |
| |
| public void writeToFd(FileDescriptor fd, long offsetBytes, long lengthBytes) throws Exception { |
| try (FileInputStream in = new FileInputStream(mFile)) { |
| in.getChannel().position(offsetBytes); |
| try (FileOutputStream out = new FileOutputStream(fd)) { |
| copy(in, out, lengthBytes); |
| } |
| } |
| } |
| |
| private void copy(InputStream in, OutputStream out, long lengthBytes) throws Exception { |
| final byte[] buffer = new byte[BUFFER_SIZE_BYTES]; |
| long bytesWrittern = 0; |
| while (bytesWrittern < lengthBytes) { |
| final int toWrite = (bytesWrittern + buffer.length <= lengthBytes) |
| ? buffer.length : (int) (lengthBytes - bytesWrittern); |
| in.read(buffer, 0, toWrite); |
| out.write(buffer, 0, toWrite); |
| bytesWrittern += toWrite; |
| } |
| } |
| |
| public void readFromSessionAndVerifyBytes(BlobStoreManager.Session session, |
| long offsetBytes, int lengthBytes) throws Exception { |
| final byte[] expectedBytes = new byte[lengthBytes]; |
| try (FileInputStream in = new FileInputStream(mFile)) { |
| read(in, expectedBytes, offsetBytes, lengthBytes); |
| } |
| |
| final byte[] actualBytes = new byte[lengthBytes]; |
| try (FileInputStream in = new ParcelFileDescriptor.AutoCloseInputStream( |
| session.openWrite(0L, 0L))) { |
| read(in, actualBytes, offsetBytes, lengthBytes); |
| } |
| |
| assertThat(actualBytes).isEqualTo(expectedBytes); |
| |
| } |
| |
| private void read(FileInputStream in, byte[] buffer, |
| long offsetBytes, int lengthBytes) throws Exception { |
| in.getChannel().position(offsetBytes); |
| in.read(buffer, 0, lengthBytes); |
| } |
| |
| public void readFromSessionAndVerifyDigest(BlobStoreManager.Session session) |
| throws Exception { |
| readFromSessionAndVerifyDigest(session, 0, mFile.length()); |
| } |
| |
| public void readFromSessionAndVerifyDigest(BlobStoreManager.Session session, |
| long offsetBytes, long lengthBytes) throws Exception { |
| final byte[] actualDigest; |
| try (FileInputStream in = new ParcelFileDescriptor.AutoCloseInputStream( |
| session.openWrite(0L, 0L))) { |
| actualDigest = createSha256Digest(in, offsetBytes, lengthBytes); |
| } |
| |
| assertThat(actualDigest).isEqualTo(mFileDigest); |
| } |
| |
| public void verifyBlob(ParcelFileDescriptor pfd) throws Exception { |
| final byte[] actualDigest; |
| try (FileInputStream in = new ParcelFileDescriptor.AutoCloseInputStream(pfd)) { |
| actualDigest = FileUtils.digest(in, "SHA-256"); |
| } |
| assertThat(actualDigest).isEqualTo(mFileDigest); |
| } |
| |
| private byte[] createSha256Digest(FileInputStream in, long offsetBytes, long lengthBytes) |
| throws Exception { |
| final MessageDigest digest = MessageDigest.getInstance("SHA-256"); |
| in.getChannel().position(offsetBytes); |
| final byte[] buffer = new byte[BUFFER_SIZE_BYTES]; |
| long bytesRead = 0; |
| while (bytesRead < lengthBytes) { |
| int toRead = (bytesRead + buffer.length <= lengthBytes) |
| ? buffer.length : (int) (lengthBytes - bytesRead); |
| toRead = in.read(buffer, 0, toRead); |
| digest.update(buffer, 0, toRead); |
| bytesRead += toRead; |
| } |
| return digest.digest(); |
| } |
| |
| private byte[] createSha256Digest(File file) throws Exception { |
| final MessageDigest digest = MessageDigest.getInstance("SHA-256"); |
| try (BufferedInputStream in = new BufferedInputStream( |
| Files.newInputStream(file.toPath()))) { |
| final byte[] buffer = new byte[BUFFER_SIZE_BYTES]; |
| int bytesRead; |
| while ((bytesRead = in.read(buffer)) > 0) { |
| digest.update(buffer, 0, bytesRead); |
| } |
| } |
| return digest.digest(); |
| } |
| |
| private void writeRandomData(RandomAccessFile file, long fileSize) |
| throws Exception { |
| long bytesWritten = 0; |
| final byte[] buffer = new byte[BUFFER_SIZE_BYTES]; |
| while (bytesWritten < fileSize) { |
| mRandom.nextBytes(buffer); |
| final int toWrite = (bytesWritten + buffer.length <= fileSize) |
| ? buffer.length : (int) (fileSize - bytesWritten); |
| file.seek(bytesWritten); |
| file.write(buffer, 0, toWrite); |
| bytesWritten += toWrite; |
| } |
| } |
| } |