1 /* 2 * Copyright 2022 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.google.android.libraries.mobiledatadownload.file.backends; 17 18 import static com.google.common.base.Charsets.UTF_8; 19 import static com.google.common.truth.Truth.assertThat; 20 import static org.junit.Assert.assertThrows; 21 22 import android.content.ContentResolver; 23 import android.content.Context; 24 import android.net.Uri; 25 import androidx.test.core.app.ApplicationProvider; 26 import com.google.android.libraries.mobiledatadownload.file.SynchronousFileStorage; 27 import com.google.android.libraries.mobiledatadownload.file.common.MalformedUriException; 28 import com.google.android.libraries.mobiledatadownload.file.common.UnsupportedFileStorageOperation; 29 import com.google.android.libraries.mobiledatadownload.file.openers.AppendStreamOpener; 30 import com.google.android.libraries.mobiledatadownload.file.openers.ReadStreamOpener; 31 import com.google.android.libraries.mobiledatadownload.file.openers.WriteStreamOpener; 32 import com.google.common.collect.ImmutableList; 33 import com.google.common.io.ByteStreams; 34 import com.google.thirdparty.robolectric.GoogleRobolectricTestRunner; 35 import java.io.ByteArrayInputStream; 36 import java.io.InputStream; 37 import org.junit.Before; 38 import org.junit.Test; 39 import org.junit.runner.RunWith; 40 import org.robolectric.Shadows; 41 42 @RunWith(GoogleRobolectricTestRunner.class) 43 public class ContentResolverBackendTest { 44 45 private final Context context = ApplicationProvider.getApplicationContext(); 46 private SynchronousFileStorage storage; 47 private ContentResolver contentResolver; 48 49 @Before setUpStorage()50 public final void setUpStorage() { 51 ContentResolverBackend backend = ContentResolverBackend.builder(context).build(); 52 storage = new SynchronousFileStorage(ImmutableList.of(backend)); 53 contentResolver = context.getContentResolver(); 54 } 55 56 @Test openForRead_reads()57 public void openForRead_reads() throws Exception { 58 Uri uri = Uri.parse("content://test/openForRead_reads"); 59 String expected = "expected content"; 60 Shadows.shadowOf(contentResolver) 61 .registerInputStream(uri, new ByteArrayInputStream(expected.getBytes(UTF_8))); 62 63 try (InputStream in = storage.open(uri, ReadStreamOpener.create())) { 64 String actual = new String(ByteStreams.toByteArray(in), UTF_8); 65 assertThat(actual).isEqualTo(expected); 66 } 67 } 68 69 @Test openForRead_missingFile()70 public void openForRead_missingFile() throws Exception { 71 Uri uri = Uri.parse("content://test/openForRead_missingFile"); 72 73 try (InputStream in = storage.open(uri, ReadStreamOpener.create())) { 74 // The shadow is weird: it returns a stream even if not registered, but that stream throws 75 // when you try to use it. 76 assertThrows(UnsupportedOperationException.class, () -> in.read()); 77 } 78 } 79 80 // TODO(b/110493197): Add test for native read. SynchronousFileStorage lacks 81 // registerFileDescriptor. 82 83 @Test openForWrite_notImplemented()84 public void openForWrite_notImplemented() throws Exception { 85 Uri uri = Uri.parse("content://test/openForWrite_notImplemented"); 86 87 assertThrows( 88 UnsupportedFileStorageOperation.class, () -> storage.open(uri, WriteStreamOpener.create())); 89 } 90 91 @Test openForAppend_notImplemented()92 public void openForAppend_notImplemented() throws Exception { 93 Uri uri = Uri.parse("content://test/ok"); 94 95 assertThrows( 96 UnsupportedFileStorageOperation.class, 97 () -> storage.open(uri, AppendStreamOpener.create())); 98 } 99 100 @Test nonEmbedded_checksScheme()101 public void nonEmbedded_checksScheme() throws Exception { 102 ContentResolverBackend nonEmbedded = ContentResolverBackend.builder(context).build(); 103 Uri uri = Uri.parse("WRONG://test/nonEmbedded_checksScheme"); 104 105 assertThrows(MalformedUriException.class, () -> nonEmbedded.openForRead(uri)); 106 assertThat(nonEmbedded.name()).isEqualTo("content"); 107 } 108 109 @Test embedded_rewritesScheme()110 public void embedded_rewritesScheme() throws Exception { 111 ContentResolverBackend embedded = 112 ContentResolverBackend.builder(context).setEmbedded(true).build(); 113 Uri uri = Uri.parse("OTHERSCHEME://test/embedded_rewritesScheme"); 114 Uri contentUri = uri.buildUpon().scheme("content").build(); 115 String expected = "expected content"; 116 Shadows.shadowOf(contentResolver) 117 .registerInputStream(contentUri, new ByteArrayInputStream(expected.getBytes(UTF_8))); 118 119 try (InputStream in = embedded.openForRead(uri)) { 120 String actual = new String(ByteStreams.toByteArray(in), UTF_8); 121 assertThat(actual).isEqualTo(expected); 122 } 123 assertThrows(IllegalStateException.class, () -> embedded.name()); 124 } 125 } 126