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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.android;
import static com.google.common.base.Predicates.not;
import com.android.build.gradle.tasks.ResourceUsageAnalyzer;
import com.google.common.collect.ImmutableList;
import com.google.common.io.ByteStreams;
import com.google.devtools.build.android.AndroidResourceOutputs.ZipBuilder;
import com.google.devtools.build.android.AndroidResourceOutputs.ZipBuilderVisitorWithDirectories;
import com.google.devtools.build.android.aapt2.CompiledResources;
import com.google.devtools.build.android.aapt2.ResourceCompiler;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import javax.annotation.Nullable;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
/** Represents a collection of raw, merged resources with an optional id list. */
public class ResourcesZip {
private final Path resourcesRoot;
private final Path assetsRoot;
@Nullable private final Path apkWithAssets;
@Nullable private final Path ids;
private ResourcesZip(
Path resourcesRoot, Path assetsRoot, @Nullable Path ids, @Nullable Path apkWithAssets) {
this.resourcesRoot = resourcesRoot;
this.assetsRoot = assetsRoot;
this.ids = ids;
this.apkWithAssets = apkWithAssets;
}
/**
* @param resourcesRoot The root of the raw resources.
* @param assetsRoot The root of the raw assets.
*/
public static ResourcesZip from(Path resourcesRoot, Path assetsRoot) {
return new ResourcesZip(resourcesRoot, assetsRoot, null, null);
}
/**
* @param resourcesRoot The root of the raw resources.
* @param assetsRoot The root of the raw assets.
* @param resourceIds Optional path to a file containing the resource ids.
*/
public static ResourcesZip from(Path resourcesRoot, Path assetsRoot, Path resourceIds) {
return new ResourcesZip(
resourcesRoot,
assetsRoot,
resourceIds != null && Files.exists(resourceIds) ? resourceIds : null,
null);
}
/**
* @param resourcesRoot The root of the raw resources.
* @param apkWithAssets The apk containing assets.
* @param resourceIds Optional path to a file containing the resource ids.
*/
public static ResourcesZip fromApk(Path resourcesRoot, Path apkWithAssets, Path resourceIds) {
return new ResourcesZip(
resourcesRoot,
/* assetsRoot= */ null,
resourceIds != null && Files.exists(resourceIds) ? resourceIds : null,
apkWithAssets);
}
/** Creates a ResourcesZip from an archive by expanding into the workingDirectory. */
public static ResourcesZip createFrom(Path resourcesZip, Path workingDirectory)
throws IOException {
// Expand resource files zip into working directory.
final ZipFile zipFile = new ZipFile(resourcesZip.toFile());
zipFile
.stream()
.filter(not(ZipEntry::isDirectory))
.forEach(
entry -> {
Path output = workingDirectory.resolve(entry.getName());
try {
Files.createDirectories(output.getParent());
try (FileOutputStream fos = new FileOutputStream(output.toFile())) {
ByteStreams.copy(zipFile.getInputStream(entry), fos);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
});
return from(
Files.createDirectories(workingDirectory.resolve("res")),
Files.createDirectories(workingDirectory.resolve("assets")),
workingDirectory.resolve("ids.txt"));
}
/**
* Creates a zip file containing the provided android resources and assets.
*
* @param output The path to write the zip file
* @param compress Whether or not to compress the content
* @throws IOException
*/
public void writeTo(Path output, boolean compress) throws IOException {
try (final ZipBuilder zip = ZipBuilder.createFor(output)) {
if (Files.exists(resourcesRoot)) {
ZipBuilderVisitorWithDirectories visitor =
new ZipBuilderVisitorWithDirectories(zip, resourcesRoot, "res");
visitor.setCompress(compress);
Files.walkFileTree(resourcesRoot, visitor);
if (!Files.exists(resourcesRoot.resolve("values/public.xml"))) {
// add an empty public xml, if one doesn't exist. The ResourceUsageAnalyzer expects one.
visitor.addEntry(
resourcesRoot.resolve("values").resolve("public.xml"),
"<resources></resources>".getBytes(StandardCharsets.UTF_8));
}
visitor.writeEntries();
}
if (apkWithAssets != null) {
ZipFile apkZip = new ZipFile(apkWithAssets.toString());
apkZip
.stream()
.filter(entry -> entry.getName().startsWith("assets/"))
.forEach(
entry -> {
try {
zip.addEntry(entry, ByteStreams.toByteArray(apkZip.getInputStream(entry)));
} catch (IOException e) {
throw new RuntimeException(e);
}
});
zip.addEntry("assets/", new byte[0], compress ? ZipEntry.DEFLATED : ZipEntry.STORED);
} else if (Files.exists(assetsRoot)) {
ZipBuilderVisitorWithDirectories visitor =
new ZipBuilderVisitorWithDirectories(zip, assetsRoot, "assets");
visitor.setCompress(compress);
Files.walkFileTree(assetsRoot, visitor);
visitor.writeEntries();
}
try {
if (ids != null) {
zip.addEntry("ids.txt", Files.readAllBytes(ids), ZipEntry.STORED);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
/** Removes unused resources from the archived resources. */
public ShrunkResources shrink(
Set<String> packages,
Path rTxt,
Path classJar,
Path manifest,
@Nullable Path proguardMapping,
Path logFile,
Path workingDirectory)
throws ParserConfigurationException, IOException, SAXException {
new ResourceUsageAnalyzer(
packages, rTxt, classJar, manifest, proguardMapping, resourcesRoot, logFile)
.shrink(workingDirectory);
return ShrunkResources.of(
new ResourcesZip(workingDirectory, assetsRoot, ids, null),
new UnvalidatedAndroidData(
ImmutableList.of(workingDirectory), ImmutableList.of(assetsRoot), manifest));
}
static class ShrunkResources {
private ResourcesZip resourcesZip;
private UnvalidatedAndroidData unvalidatedAndroidData;
private ShrunkResources(
ResourcesZip resourcesZip, UnvalidatedAndroidData unvalidatedAndroidData) {
this.resourcesZip = resourcesZip;
this.unvalidatedAndroidData = unvalidatedAndroidData;
}
public static ShrunkResources of(
ResourcesZip resourcesZip, UnvalidatedAndroidData unvalidatedAndroidData) {
return new ShrunkResources(resourcesZip, unvalidatedAndroidData);
}
public ShrunkResources writeArchiveTo(Path archivePath, boolean compress) throws IOException {
resourcesZip.writeTo(archivePath, compress);
return this;
}
public CompiledResources compile(ResourceCompiler compiler, Path workingDirectory)
throws InterruptedException, ExecutionException, IOException {
return unvalidatedAndroidData
.compile(compiler, workingDirectory)
.addStableIds(resourcesZip.ids);
}
}
}
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