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/*
* Copyright (C) 2017 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.dialer.about;
import android.content.Context;
import android.content.res.Resources;
import com.android.dialer.common.Assert;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
/** A helper for extracting licenses. */
public final class Licenses {
private static final String TAG = "Licenses";
private static final String LICENSE_FILENAME = "third_party_licenses";
private static final String LICENSE_METADATA_FILENAME = "third_party_license_metadata";
/** Return the licenses bundled into this app. */
public static ArrayList<License> getLicenses(Context context) {
return getLicenseListFromMetadata(
getTextFromResource(context.getApplicationContext(), LICENSE_METADATA_FILENAME, 0, -1));
}
/**
* Returns a list of {@link License}s parsed from a license metadata file.
*
* @param metadata a {@code String} containing the contents of a license metadata file.
*/
private static ArrayList<License> getLicenseListFromMetadata(String metadata) {
String[] entries = metadata.split("\n");
ArrayList<License> licenses = new ArrayList<License>(entries.length);
for (String entry : entries) {
int delimiter = entry.indexOf(' ');
String[] licenseLocation = entry.substring(0, delimiter).split(":");
Assert.checkState(
delimiter > 0 && licenseLocation.length == 2,
"Invalid license meta-data line:\n" + entry);
long licenseOffset = Long.parseLong(licenseLocation[0]);
int licenseLength = Integer.parseInt(licenseLocation[1]);
licenses.add(License.create(entry.substring(delimiter + 1), licenseOffset, licenseLength));
}
Collections.sort(licenses);
return licenses;
}
/** Return the text of a bundled license file. */
public static String getLicenseText(Context context, License license) {
long offset = license.getLicenseOffset();
int length = license.getLicenseLength();
return getTextFromResource(context, LICENSE_FILENAME, offset, length);
}
private static String getTextFromResource(
Context context, String filename, long offset, int length) {
Resources resources = context.getApplicationContext().getResources();
// When aapt is called with --rename-manifest-package, the package name is changed for the
// application, but not for the resources. This is to find the package name of a known
// resource to know what package to lookup the license files in.
String packageName = resources.getResourcePackageName(R.id.dummy_placeholder);
InputStream stream =
resources.openRawResource(resources.getIdentifier(filename, "raw", packageName));
return getTextFromInputStream(stream, offset, length);
}
private static String getTextFromInputStream(InputStream stream, long offset, int length) {
byte[] buffer = new byte[1024];
ByteArrayOutputStream textArray = new ByteArrayOutputStream();
try {
stream.skip(offset);
int bytesRemaining = length > 0 ? length : Integer.MAX_VALUE;
int bytes = 0;
while (bytesRemaining > 0
&& (bytes = stream.read(buffer, 0, Math.min(bytesRemaining, buffer.length))) != -1) {
textArray.write(buffer, 0, bytes);
bytesRemaining -= bytes;
}
stream.close();
} catch (IOException e) {
throw new RuntimeException("Failed to read license or metadata text.", e);
}
try {
return textArray.toString("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("Unsupported encoding UTF8. This should always be supported.", e);
}
}
}
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