| /* |
| * Copyright (C) 2015 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.statementservice; |
| |
| import android.app.Service; |
| import android.content.Intent; |
| import android.net.http.HttpResponseCache; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.os.IBinder; |
| import android.os.Looper; |
| import android.os.ResultReceiver; |
| import android.util.Log; |
| |
| import com.android.statementservice.retriever.AbstractAsset; |
| import com.android.statementservice.retriever.AbstractAssetMatcher; |
| import com.android.statementservice.retriever.AbstractStatementRetriever; |
| import com.android.statementservice.retriever.AbstractStatementRetriever.Result; |
| import com.android.statementservice.retriever.AssociationServiceException; |
| import com.android.statementservice.retriever.Relation; |
| import com.android.statementservice.retriever.Statement; |
| |
| import org.json.JSONException; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| |
| /** |
| * Handles com.android.statementservice.service.CHECK_ALL_ACTION intents. |
| */ |
| public final class DirectStatementService extends Service { |
| private static final String TAG = DirectStatementService.class.getSimpleName(); |
| |
| /** |
| * Returns true if every asset in {@code SOURCE_ASSET_DESCRIPTORS} is associated with {@code |
| * EXTRA_TARGET_ASSET_DESCRIPTOR} for {@code EXTRA_RELATION} relation. |
| * |
| * <p>Takes parameter {@code EXTRA_RELATION}, {@code SOURCE_ASSET_DESCRIPTORS}, {@code |
| * EXTRA_TARGET_ASSET_DESCRIPTOR}, and {@code EXTRA_RESULT_RECEIVER}. |
| */ |
| public static final String CHECK_ALL_ACTION = |
| "com.android.statementservice.service.CHECK_ALL_ACTION"; |
| |
| /** |
| * Parameter for {@link #CHECK_ALL_ACTION}. |
| * |
| * <p>A relation string. |
| */ |
| public static final String EXTRA_RELATION = |
| "com.android.statementservice.service.RELATION"; |
| |
| /** |
| * Parameter for {@link #CHECK_ALL_ACTION}. |
| * |
| * <p>An array of asset descriptors in JSON. |
| */ |
| public static final String EXTRA_SOURCE_ASSET_DESCRIPTORS = |
| "com.android.statementservice.service.SOURCE_ASSET_DESCRIPTORS"; |
| |
| /** |
| * Parameter for {@link #CHECK_ALL_ACTION}. |
| * |
| * <p>An asset descriptor in JSON. |
| */ |
| public static final String EXTRA_TARGET_ASSET_DESCRIPTOR = |
| "com.android.statementservice.service.TARGET_ASSET_DESCRIPTOR"; |
| |
| /** |
| * Parameter for {@link #CHECK_ALL_ACTION}. |
| * |
| * <p>A {@code ResultReceiver} instance that will be used to return the result. If the request |
| * failed, return {@link #RESULT_FAIL} and an empty {@link android.os.Bundle}. Otherwise, return |
| * {@link #RESULT_SUCCESS} and a {@link android.os.Bundle} with the result stored in {@link |
| * #IS_ASSOCIATED}. |
| */ |
| public static final String EXTRA_RESULT_RECEIVER = |
| "com.android.statementservice.service.RESULT_RECEIVER"; |
| |
| /** |
| * A boolean bundle entry that stores the result of {@link #CHECK_ALL_ACTION}. |
| * This is set only if the service returns with {@code RESULT_SUCCESS}. |
| * {@code IS_ASSOCIATED} is true if and only if {@code FAILED_SOURCES} is empty. |
| */ |
| public static final String IS_ASSOCIATED = "is_associated"; |
| |
| /** |
| * A String ArrayList bundle entry that stores sources that can't be verified. |
| */ |
| public static final String FAILED_SOURCES = "failed_sources"; |
| |
| /** |
| * Returned by the service if the request is successfully processed. The caller should check |
| * the {@code IS_ASSOCIATED} field to determine if the association exists or not. |
| */ |
| public static final int RESULT_SUCCESS = 0; |
| |
| /** |
| * Returned by the service if the request failed. The request will fail if, for example, the |
| * input is not well formed, or the network is not available. |
| */ |
| public static final int RESULT_FAIL = 1; |
| |
| private static final long HTTP_CACHE_SIZE_IN_BYTES = 1 * 1024 * 1024; // 1 MBytes |
| private static final String CACHE_FILENAME = "request_cache"; |
| |
| private AbstractStatementRetriever mStatementRetriever; |
| private Handler mHandler; |
| private HandlerThread mThread; |
| private HttpResponseCache mHttpResponseCache; |
| |
| @Override |
| public void onCreate() { |
| mThread = new HandlerThread("DirectStatementService thread", |
| android.os.Process.THREAD_PRIORITY_BACKGROUND); |
| mThread.start(); |
| onCreate(AbstractStatementRetriever.createDirectRetriever(this), mThread.getLooper(), |
| getCacheDir()); |
| } |
| |
| /** |
| * Creates a DirectStatementService with the dependencies passed in for easy testing. |
| */ |
| public void onCreate(AbstractStatementRetriever statementRetriever, Looper looper, |
| File cacheDir) { |
| super.onCreate(); |
| mStatementRetriever = statementRetriever; |
| mHandler = new Handler(looper); |
| |
| try { |
| File httpCacheDir = new File(cacheDir, CACHE_FILENAME); |
| mHttpResponseCache = HttpResponseCache.install(httpCacheDir, HTTP_CACHE_SIZE_IN_BYTES); |
| } catch (IOException e) { |
| Log.i(TAG, "HTTPS response cache installation failed:" + e); |
| } |
| } |
| |
| @Override |
| public void onDestroy() { |
| super.onDestroy(); |
| if (mThread != null) { |
| mThread.quit(); |
| } |
| |
| try { |
| if (mHttpResponseCache != null) { |
| mHttpResponseCache.delete(); |
| } |
| } catch (IOException e) { |
| Log.i(TAG, "HTTP(S) response cache deletion failed:" + e); |
| } |
| } |
| |
| @Override |
| public IBinder onBind(Intent intent) { |
| return null; |
| } |
| |
| @Override |
| public int onStartCommand(Intent intent, int flags, int startId) { |
| super.onStartCommand(intent, flags, startId); |
| |
| if (intent == null) { |
| Log.e(TAG, "onStartCommand called with null intent"); |
| return START_STICKY; |
| } |
| |
| if (intent.getAction().equals(CHECK_ALL_ACTION)) { |
| |
| Bundle extras = intent.getExtras(); |
| List<String> sources = extras.getStringArrayList(EXTRA_SOURCE_ASSET_DESCRIPTORS); |
| String target = extras.getString(EXTRA_TARGET_ASSET_DESCRIPTOR); |
| String relation = extras.getString(EXTRA_RELATION); |
| ResultReceiver resultReceiver = extras.getParcelable(EXTRA_RESULT_RECEIVER); |
| |
| if (resultReceiver == null) { |
| Log.e(TAG, " Intent does not have extra " + EXTRA_RESULT_RECEIVER); |
| return START_STICKY; |
| } |
| if (sources == null) { |
| Log.e(TAG, " Intent does not have extra " + EXTRA_SOURCE_ASSET_DESCRIPTORS); |
| resultReceiver.send(RESULT_FAIL, Bundle.EMPTY); |
| return START_STICKY; |
| } |
| if (target == null) { |
| Log.e(TAG, " Intent does not have extra " + EXTRA_TARGET_ASSET_DESCRIPTOR); |
| resultReceiver.send(RESULT_FAIL, Bundle.EMPTY); |
| return START_STICKY; |
| } |
| if (relation == null) { |
| Log.e(TAG, " Intent does not have extra " + EXTRA_RELATION); |
| resultReceiver.send(RESULT_FAIL, Bundle.EMPTY); |
| return START_STICKY; |
| } |
| |
| mHandler.post(new ExceptionLoggingFutureTask<Void>( |
| new IsAssociatedCallable(sources, target, relation, resultReceiver), TAG)); |
| } else { |
| Log.e(TAG, "onStartCommand called with unsupported action: " + intent.getAction()); |
| } |
| return START_STICKY; |
| } |
| |
| private class IsAssociatedCallable implements Callable<Void> { |
| |
| private List<String> mSources; |
| private String mTarget; |
| private String mRelation; |
| private ResultReceiver mResultReceiver; |
| |
| public IsAssociatedCallable(List<String> sources, String target, String relation, |
| ResultReceiver resultReceiver) { |
| mSources = sources; |
| mTarget = target; |
| mRelation = relation; |
| mResultReceiver = resultReceiver; |
| } |
| |
| private boolean verifyOneSource(AbstractAsset source, AbstractAssetMatcher target, |
| Relation relation) throws AssociationServiceException { |
| Result statements = mStatementRetriever.retrieveStatements(source); |
| for (Statement statement : statements.getStatements()) { |
| if (relation.matches(statement.getRelation()) |
| && target.matches(statement.getTarget())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public Void call() { |
| Bundle result = new Bundle(); |
| ArrayList<String> failedSources = new ArrayList<String>(); |
| AbstractAssetMatcher target; |
| Relation relation; |
| try { |
| target = AbstractAssetMatcher.createMatcher(mTarget); |
| relation = Relation.create(mRelation); |
| } catch (AssociationServiceException | JSONException e) { |
| Log.e(TAG, "isAssociatedCallable failed with exception", e); |
| mResultReceiver.send(RESULT_FAIL, Bundle.EMPTY); |
| return null; |
| } |
| |
| boolean allSourcesVerified = true; |
| for (String sourceString : mSources) { |
| AbstractAsset source; |
| try { |
| source = AbstractAsset.create(sourceString); |
| } catch (AssociationServiceException e) { |
| mResultReceiver.send(RESULT_FAIL, Bundle.EMPTY); |
| return null; |
| } |
| |
| try { |
| if (!verifyOneSource(source, target, relation)) { |
| failedSources.add(source.toJson()); |
| allSourcesVerified = false; |
| } |
| } catch (AssociationServiceException e) { |
| failedSources.add(source.toJson()); |
| allSourcesVerified = false; |
| } |
| } |
| |
| result.putBoolean(IS_ASSOCIATED, allSourcesVerified); |
| result.putStringArrayList(FAILED_SOURCES, failedSources); |
| mResultReceiver.send(RESULT_SUCCESS, result); |
| return null; |
| } |
| } |
| } |