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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.tv.license;
import android.content.Context;
import android.support.annotation.RawRes;
import com.android.tv.R;
import com.android.tv.common.SoftPreconditions;
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 embedded using
* third_party_licenses.build:third_party_licenses().
*/
public final class Licenses {
public static final String TAG = "Licenses";
public static boolean hasLicenses(Context context) {
return !getTextFromResource(
context.getApplicationContext(), R.raw.third_party_license_metadata, 0, -1)
.isEmpty();
}
/** Return the licenses bundled into this app. */
public static ArrayList<License> getLicenses(Context context) {
return getLicenseListFromMetadata(
getTextFromResource(
context.getApplicationContext(), R.raw.third_party_license_metadata, 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.
* @param filePath a path to a package archive with licenses or empty string for the app package
*/
private static ArrayList<License> getLicenseListFromMetadata(String metadata, String filePath) {
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(":");
SoftPreconditions.checkState(
licenseLocation.length == 2 && delimiter > 0,
TAG,
"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,
filePath));
}
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, R.raw.third_party_licenses, offset, length);
}
private static String getTextFromResource(
Context context, @RawRes int resourcesIdentifier, long offset, int length) {
InputStream stream =
context.getApplicationContext().getResources().openRawResource(resourcesIdentifier);
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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