| /* |
| * Copyright 2022 Google LLC |
| * |
| * 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.google.android.libraries.mobiledatadownload.file.transforms; |
| |
| import static com.google.android.libraries.mobiledatadownload.file.common.testing.StreamUtils.createFile; |
| import static com.google.android.libraries.mobiledatadownload.file.common.testing.StreamUtils.readFile; |
| import static com.google.common.truth.Truth.assertThat; |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| import static org.junit.Assert.assertThrows; |
| |
| import android.net.Uri; |
| import com.google.android.libraries.mobiledatadownload.file.SynchronousFileStorage; |
| import com.google.android.libraries.mobiledatadownload.file.backends.FileUri; |
| import com.google.android.libraries.mobiledatadownload.file.backends.JavaFileBackend; |
| import com.google.android.libraries.mobiledatadownload.file.behaviors.UriComputingBehavior; |
| import com.google.android.libraries.mobiledatadownload.file.common.testing.TemporaryUri; |
| import com.google.android.libraries.mobiledatadownload.file.openers.AppendStreamOpener; |
| import com.google.android.libraries.mobiledatadownload.file.openers.ReadStreamOpener; |
| import com.google.android.libraries.mobiledatadownload.file.openers.WriteStreamOpener; |
| import com.google.android.libraries.mobiledatadownload.file.spi.Transform; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.io.ByteStreams; |
| import com.google.thirdparty.robolectric.GoogleRobolectricTestRunner; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| import java.util.concurrent.Future; |
| import org.junit.Before; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| @RunWith(GoogleRobolectricTestRunner.class) |
| public final class IntegrityTransformTest { |
| |
| private static final String ORIGTEXT = "This is some regular old text ABC 123 !@#"; |
| private static final String ORIGTEXT_SHA256_B64 = "FoR1HrxdAhY05DE/gAUj0yjpzYpfWb0fJE+XBp8lY0o="; |
| |
| @Rule public TemporaryUri tmpUri = new TemporaryUri(); |
| |
| private SynchronousFileStorage storage; |
| |
| @Before |
| public void setUpStorage() throws Exception { |
| storage = |
| new SynchronousFileStorage( |
| ImmutableList.of(new JavaFileBackend()), ImmutableList.of(new IntegrityTransform())); |
| } |
| |
| @Test |
| public void name_isIntegrity() throws Exception { |
| Transform transform = new IntegrityTransform(); |
| assertThat(transform.name()).isEqualTo("integrity"); |
| } |
| |
| @Test |
| public void write_shouldComputeChecksum() throws Exception { |
| Uri uri = tmpUri.newUriBuilder().withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| Future<Uri> uriFuture; |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| try (OutputStream sink = |
| storage.open(uri, WriteStreamOpener.create().withBehaviors(computeUri)); |
| Writer writer = new OutputStreamWriter(sink, UTF_8)) { |
| writer.write(ORIGTEXT); |
| uriFuture = computeUri.uriFuture(); |
| } |
| |
| Uri uriWithHash = uriFuture.get(); |
| |
| assertThat(IntegrityTransform.getDigestIfPresent(uriWithHash)).isEqualTo(ORIGTEXT_SHA256_B64); |
| } |
| |
| @Test |
| public void consumeStream_shouldComputeChecksum() throws Exception { |
| FileUri.Builder builder = tmpUri.newUriBuilder(); |
| createFile(storage, builder.build(), ORIGTEXT); |
| Uri uri = builder.withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| Future<Uri> uriFuture; |
| try (InputStream in = storage.open(uri, ReadStreamOpener.create().withBehaviors(computeUri))) { |
| ByteStreams.exhaust(in); |
| uriFuture = computeUri.uriFuture(); |
| } |
| |
| assertThat(IntegrityTransform.getDigestIfPresent(uriFuture.get())) |
| .isEqualTo(ORIGTEXT_SHA256_B64); |
| } |
| |
| @Test |
| public void consumeStream_shouldBothVerifyAndComputeChecksum() throws Exception { |
| FileUri.Builder builder = tmpUri.newUriBuilder(); |
| createFile(storage, builder.build(), ORIGTEXT); |
| Uri uri = builder.withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| Future<Uri> uriFuture; |
| try (InputStream in = storage.open(uri, ReadStreamOpener.create().withBehaviors(computeUri))) { |
| ByteStreams.exhaust(in); |
| uriFuture = computeUri.uriFuture(); |
| } |
| |
| assertThat(IntegrityTransform.getDigestIfPresent(uriFuture.get())) |
| .isEqualTo(ORIGTEXT_SHA256_B64); |
| |
| // Try again, using the uriWithHash as input, so that hash is verified and computed |
| // simultaneously. |
| UriComputingBehavior computeUri2 = new UriComputingBehavior(uriFuture.get()); |
| Future<Uri> uriFuture2; |
| try (InputStream in = |
| storage.open(uriFuture.get(), ReadStreamOpener.create().withBehaviors(computeUri2))) { |
| ByteStreams.exhaust(in); |
| uriFuture2 = computeUri2.uriFuture(); |
| } |
| |
| assertThat(IntegrityTransform.getDigestIfPresent(uriFuture2.get())) |
| .isEqualTo(ORIGTEXT_SHA256_B64); |
| } |
| |
| @Test |
| public void readFully_shouldComputeChecksum() throws Exception { |
| // Buffer is exact length, does not reach EOF. Depends on close() to compute checksum. |
| FileUri.Builder builder = tmpUri.newUriBuilder(); |
| createFile(storage, builder.build(), ORIGTEXT); |
| Uri uri = builder.withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| |
| Future<Uri> result; |
| byte[] buffer = new byte[ORIGTEXT.length()]; |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| try (InputStream input = |
| storage.open(uri, ReadStreamOpener.create().withBehaviors(computeUri))) { |
| ByteStreams.readFully(input, buffer); |
| result = computeUri.uriFuture(); |
| } |
| |
| assertThat(buffer).isEqualTo(ORIGTEXT.getBytes("UTF-8")); |
| assertThat(IntegrityTransform.getDigestIfPresent(result.get())).isEqualTo(ORIGTEXT_SHA256_B64); |
| } |
| |
| @Test |
| public void readWithWithPrematureClose_shouldComputeDifferentChecksum() throws Exception { |
| // This behavior is not necessarily useful, but is here to be documented. |
| FileUri.Builder builder = tmpUri.newUriBuilder(); |
| createFile(storage, builder.build(), ORIGTEXT); |
| Uri uri = builder.withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| |
| byte[] buffer = new byte[ORIGTEXT.length() - 1]; // Full length - 1. |
| Future<Uri> result; |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| try (InputStream input = |
| storage.open(uri, ReadStreamOpener.create().withBehaviors(computeUri))) { |
| ByteStreams.readFully(input, buffer); |
| result = computeUri.uriFuture(); |
| } |
| |
| assertThat(buffer).isNotEqualTo(ORIGTEXT.getBytes("UTF-8")); |
| assertThat(IntegrityTransform.getDigestIfPresent(result.get())) |
| .isNotEqualTo(ORIGTEXT_SHA256_B64); |
| } |
| |
| @Test |
| public void read_shouldValidateChecksum() throws Exception { |
| FileUri.Builder builder = tmpUri.newUriBuilder(); |
| Uri uriWithoutTransform = builder.build(); |
| Uri uri = builder.withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| createFile(storage, uriWithoutTransform, ORIGTEXT); |
| |
| Future<Uri> uriFuture; |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| try (InputStream in = storage.open(uri, ReadStreamOpener.create().withBehaviors(computeUri))) { |
| ByteStreams.exhaust(in); |
| uriFuture = computeUri.uriFuture(); |
| } |
| |
| assertThat(IntegrityTransform.getDigestIfPresent(uriFuture.get())) |
| .isEqualTo(ORIGTEXT_SHA256_B64); |
| assertThat(readFile(storage, uri)).isEqualTo(ORIGTEXT); |
| assertThat(readFile(storage, uriFuture.get())).isEqualTo(ORIGTEXT); |
| |
| try (Writer writer = |
| new OutputStreamWriter( |
| storage.open(uriWithoutTransform, AppendStreamOpener.create()), UTF_8)) { |
| writer.write("pwned"); |
| } |
| assertThat(readFile(storage, uri)).endsWith("pwned"); |
| assertThrows(IOException.class, () -> readFile(storage, uriFuture.get())); |
| } |
| |
| @Test |
| public void read_shouldValidateChecksumWithReadingOneByteAtATime() throws Exception { |
| FileUri.Builder builder = tmpUri.newUriBuilder(); |
| Uri uriWithoutTransform = builder.build(); |
| Uri uri = builder.withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| createFile(storage, uriWithoutTransform, ORIGTEXT); |
| |
| Future<Uri> uriFuture; |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| try (InputStream in = storage.open(uri, ReadStreamOpener.create().withBehaviors(computeUri))) { |
| ByteStreams.exhaust(in); |
| uriFuture = computeUri.uriFuture(); |
| } |
| try (Writer writer = |
| new OutputStreamWriter( |
| storage.open(uriWithoutTransform, AppendStreamOpener.create()), UTF_8)) { |
| writer.write("pwned"); |
| } |
| |
| assertThrows(IOException.class, () -> readFile(storage, uriFuture.get())); |
| } |
| |
| @Test |
| public void partialReadAndClose_shouldFailValidation() throws Exception { |
| FileUri.Builder builder = tmpUri.newUriBuilder(); |
| createFile(storage, builder.build(), ORIGTEXT); |
| Uri uri = builder.withTransform(TransformProtos.DEFAULT_INTEGRITY_SPEC).build(); |
| |
| Future<Uri> uriFuture; |
| UriComputingBehavior computeUri = new UriComputingBehavior(uri); |
| try (InputStream in = storage.open(uri, ReadStreamOpener.create().withBehaviors(computeUri))) { |
| ByteStreams.exhaust(in); |
| uriFuture = computeUri.uriFuture(); |
| } |
| |
| assertThat(IntegrityTransform.getDigestIfPresent(uriFuture.get())) |
| .isEqualTo(ORIGTEXT_SHA256_B64); |
| assertThat(readFile(storage, uri)).isEqualTo(ORIGTEXT); |
| assertThat(readFile(storage, uriFuture.get())).isEqualTo(ORIGTEXT); |
| |
| // Fills a buffer with full length - 1. |
| byte[] buffer = new byte[ORIGTEXT.length() - 1]; |
| InputStream input = storage.open(uriFuture.get(), ReadStreamOpener.create()); |
| ByteStreams.readFully(input, buffer); |
| assertThrows(IOException.class, () -> input.close()); |
| } |
| } |