570 lines
27 KiB
Java
570 lines
27 KiB
Java
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin;
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import android.content.ContentProviderClient;
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import android.content.ContentResolver;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.res.AssetFileDescriptor;
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import android.database.Cursor;
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import android.net.Uri;
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import android.os.RemoteException;
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import android.text.TextUtils;
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import android.util.Log;
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import com.android.inputmethod.dictionarypack.DictionaryPackConstants;
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import com.android.inputmethod.dictionarypack.MD5Calculator;
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import com.android.inputmethod.dictionarypack.UpdateHandler;
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import com.android.inputmethod.latin.common.FileUtils;
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import com.android.inputmethod.latin.define.DecoderSpecificConstants;
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import com.android.inputmethod.latin.utils.DictionaryInfoUtils;
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import com.android.inputmethod.latin.utils.DictionaryInfoUtils.DictionaryInfo;
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import com.android.inputmethod.latin.utils.FileTransforms;
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import com.android.inputmethod.latin.utils.MetadataFileUriGetter;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.Closeable;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.Locale;
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/**
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* Group class for static methods to help with creation and getting of the binary dictionary
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* file from the dictionary provider
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*/
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public final class BinaryDictionaryFileDumper {
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private static final String TAG = BinaryDictionaryFileDumper.class.getSimpleName();
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private static final boolean DEBUG = false;
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/**
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* The size of the temporary buffer to copy files.
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*/
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private static final int FILE_READ_BUFFER_SIZE = 8192;
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// TODO: make the following data common with the native code
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private static final byte[] MAGIC_NUMBER_VERSION_1 =
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new byte[] { (byte)0x78, (byte)0xB1, (byte)0x00, (byte)0x00 };
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private static final byte[] MAGIC_NUMBER_VERSION_2 =
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new byte[] { (byte)0x9B, (byte)0xC1, (byte)0x3A, (byte)0xFE };
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private static final boolean SHOULD_VERIFY_MAGIC_NUMBER =
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DecoderSpecificConstants.SHOULD_VERIFY_MAGIC_NUMBER;
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private static final boolean SHOULD_VERIFY_CHECKSUM =
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DecoderSpecificConstants.SHOULD_VERIFY_CHECKSUM;
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private static final String DICTIONARY_PROJECTION[] = { "id" };
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private static final String QUERY_PARAMETER_MAY_PROMPT_USER = "mayPrompt";
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private static final String QUERY_PARAMETER_TRUE = "true";
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private static final String QUERY_PARAMETER_DELETE_RESULT = "result";
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private static final String QUERY_PARAMETER_SUCCESS = "success";
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private static final String QUERY_PARAMETER_FAILURE = "failure";
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// Using protocol version 2 to communicate with the dictionary pack
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private static final String QUERY_PARAMETER_PROTOCOL = "protocol";
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private static final String QUERY_PARAMETER_PROTOCOL_VALUE = "2";
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// The path fragment to append after the client ID for dictionary info requests.
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private static final String QUERY_PATH_DICT_INFO = "dict";
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// The path fragment to append after the client ID for dictionary datafile requests.
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private static final String QUERY_PATH_DATAFILE = "datafile";
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// The path fragment to append after the client ID for updating the metadata URI.
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private static final String QUERY_PATH_METADATA = "metadata";
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private static final String INSERT_METADATA_CLIENT_ID_COLUMN = "clientid";
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private static final String INSERT_METADATA_METADATA_URI_COLUMN = "uri";
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private static final String INSERT_METADATA_METADATA_ADDITIONAL_ID_COLUMN = "additionalid";
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// Prevents this class to be accidentally instantiated.
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private BinaryDictionaryFileDumper() {
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}
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/**
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* Returns a URI builder pointing to the dictionary pack.
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*
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* This creates a URI builder able to build a URI pointing to the dictionary
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* pack content provider for a specific dictionary id.
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*/
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public static Uri.Builder getProviderUriBuilder(final String path) {
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return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
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.authority(DictionaryPackConstants.AUTHORITY).appendPath(path);
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}
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/**
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* Gets the content URI builder for a specified type.
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*
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* Supported types include QUERY_PATH_DICT_INFO, which takes the locale as
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* the extraPath argument, and QUERY_PATH_DATAFILE, which needs a wordlist ID
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* as the extraPath argument.
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*
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* @param clientId the clientId to use
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* @param contentProviderClient the instance of content provider client
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* @param queryPathType the path element encoding the type
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* @param extraPath optional extra argument for this type (typically word list id)
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* @return a builder that can build the URI for the best supported protocol version
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* @throws RemoteException if the client can't be contacted
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*/
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private static Uri.Builder getContentUriBuilderForType(final String clientId,
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final ContentProviderClient contentProviderClient, final String queryPathType,
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final String extraPath) throws RemoteException {
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// Check whether protocol v2 is supported by building a v2 URI and calling getType()
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// on it. If this returns null, v2 is not supported.
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final Uri.Builder uriV2Builder = getProviderUriBuilder(clientId);
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uriV2Builder.appendPath(queryPathType);
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uriV2Builder.appendPath(extraPath);
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uriV2Builder.appendQueryParameter(QUERY_PARAMETER_PROTOCOL,
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QUERY_PARAMETER_PROTOCOL_VALUE);
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if (null != contentProviderClient.getType(uriV2Builder.build())) return uriV2Builder;
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// Protocol v2 is not supported, so create and return the protocol v1 uri.
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return getProviderUriBuilder(extraPath);
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}
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/**
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* Queries a content provider for the list of word lists for a specific locale
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* available to copy into Latin IME.
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*/
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private static List<WordListInfo> getWordListWordListInfos(final Locale locale,
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final Context context, final boolean hasDefaultWordList) {
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final String clientId = context.getString(R.string.dictionary_pack_client_id);
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final ContentProviderClient client = context.getContentResolver().
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acquireContentProviderClient(getProviderUriBuilder("").build());
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if (null == client) return Collections.<WordListInfo>emptyList();
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Cursor cursor = null;
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try {
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final Uri.Builder builder = getContentUriBuilderForType(clientId, client,
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QUERY_PATH_DICT_INFO, locale.toString());
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if (!hasDefaultWordList) {
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builder.appendQueryParameter(QUERY_PARAMETER_MAY_PROMPT_USER,
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QUERY_PARAMETER_TRUE);
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}
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final Uri queryUri = builder.build();
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final boolean isProtocolV2 = (QUERY_PARAMETER_PROTOCOL_VALUE.equals(
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queryUri.getQueryParameter(QUERY_PARAMETER_PROTOCOL)));
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cursor = client.query(queryUri, DICTIONARY_PROJECTION, null, null, null);
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if (isProtocolV2 && null == cursor) {
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reinitializeClientRecordInDictionaryContentProvider(context, client, clientId);
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cursor = client.query(queryUri, DICTIONARY_PROJECTION, null, null, null);
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}
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if (null == cursor) return Collections.<WordListInfo>emptyList();
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if (cursor.getCount() <= 0 || !cursor.moveToFirst()) {
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return Collections.<WordListInfo>emptyList();
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}
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final ArrayList<WordListInfo> list = new ArrayList<>();
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do {
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final String wordListId = cursor.getString(0);
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final String wordListLocale = cursor.getString(1);
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final String wordListRawChecksum = cursor.getString(2);
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if (TextUtils.isEmpty(wordListId)) continue;
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list.add(new WordListInfo(wordListId, wordListLocale, wordListRawChecksum));
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} while (cursor.moveToNext());
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return list;
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} catch (RemoteException e) {
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// The documentation is unclear as to in which cases this may happen, but it probably
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// happens when the content provider got suddenly killed because it crashed or because
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// the user disabled it through Settings.
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Log.e(TAG, "RemoteException: communication with the dictionary pack cut", e);
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return Collections.<WordListInfo>emptyList();
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} catch (Exception e) {
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// A crash here is dangerous because crashing here would brick any encrypted device -
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// we need the keyboard to be up and working to enter the password, so we don't want
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// to die no matter what. So let's be as safe as possible.
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Log.e(TAG, "Unexpected exception communicating with the dictionary pack", e);
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return Collections.<WordListInfo>emptyList();
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} finally {
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if (null != cursor) {
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cursor.close();
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}
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client.release();
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}
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}
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/**
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* Helper method to encapsulate exception handling.
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*/
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private static AssetFileDescriptor openAssetFileDescriptor(
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final ContentProviderClient providerClient, final Uri uri) {
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try {
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return providerClient.openAssetFile(uri, "r");
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} catch (FileNotFoundException e) {
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// I don't want to log the word list URI here for security concerns. The exception
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// contains the name of the file, so let's not pass it to Log.e here.
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Log.e(TAG, "Could not find a word list from the dictionary provider."
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/* intentionally don't pass the exception (see comment above) */);
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return null;
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} catch (RemoteException e) {
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Log.e(TAG, "Can't communicate with the dictionary pack", e);
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return null;
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}
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}
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/**
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* Stages a word list the id of which is passed as an argument. This will write the file
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* to the cache file name designated by its id and locale, overwriting it if already present
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* and creating it (and its containing directory) if necessary.
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*/
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private static void installWordListToStaging(final String wordlistId, final String locale,
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final String rawChecksum, final ContentProviderClient providerClient,
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final Context context) {
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final int COMPRESSED_CRYPTED_COMPRESSED = 0;
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final int CRYPTED_COMPRESSED = 1;
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final int COMPRESSED_CRYPTED = 2;
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final int COMPRESSED_ONLY = 3;
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final int CRYPTED_ONLY = 4;
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final int NONE = 5;
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final int MODE_MIN = COMPRESSED_CRYPTED_COMPRESSED;
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final int MODE_MAX = NONE;
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final String clientId = context.getString(R.string.dictionary_pack_client_id);
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final Uri.Builder wordListUriBuilder;
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try {
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wordListUriBuilder = getContentUriBuilderForType(clientId,
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providerClient, QUERY_PATH_DATAFILE, wordlistId /* extraPath */);
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} catch (RemoteException e) {
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Log.e(TAG, "Can't communicate with the dictionary pack", e);
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return;
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}
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final String finalFileName =
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DictionaryInfoUtils.getStagingFileName(wordlistId, locale, context);
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String tempFileName;
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try {
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tempFileName = BinaryDictionaryGetter.getTempFileName(wordlistId, context);
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} catch (IOException e) {
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Log.e(TAG, "Can't open the temporary file", e);
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return;
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}
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for (int mode = MODE_MIN; mode <= MODE_MAX; ++mode) {
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final InputStream originalSourceStream;
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InputStream inputStream = null;
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InputStream uncompressedStream = null;
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InputStream decryptedStream = null;
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BufferedInputStream bufferedInputStream = null;
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File outputFile = null;
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BufferedOutputStream bufferedOutputStream = null;
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AssetFileDescriptor afd = null;
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final Uri wordListUri = wordListUriBuilder.build();
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try {
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// Open input.
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afd = openAssetFileDescriptor(providerClient, wordListUri);
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// If we can't open it at all, don't even try a number of times.
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if (null == afd) return;
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originalSourceStream = afd.createInputStream();
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// Open output.
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outputFile = new File(tempFileName);
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// Just to be sure, delete the file. This may fail silently, and return false: this
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// is the right thing to do, as we just want to continue anyway.
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outputFile.delete();
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// Get the appropriate decryption method for this try
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switch (mode) {
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case COMPRESSED_CRYPTED_COMPRESSED:
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uncompressedStream =
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FileTransforms.getUncompressedStream(originalSourceStream);
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decryptedStream = FileTransforms.getDecryptedStream(uncompressedStream);
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inputStream = FileTransforms.getUncompressedStream(decryptedStream);
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break;
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case CRYPTED_COMPRESSED:
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decryptedStream = FileTransforms.getDecryptedStream(originalSourceStream);
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inputStream = FileTransforms.getUncompressedStream(decryptedStream);
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break;
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case COMPRESSED_CRYPTED:
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uncompressedStream =
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FileTransforms.getUncompressedStream(originalSourceStream);
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inputStream = FileTransforms.getDecryptedStream(uncompressedStream);
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break;
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case COMPRESSED_ONLY:
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inputStream = FileTransforms.getUncompressedStream(originalSourceStream);
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break;
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case CRYPTED_ONLY:
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inputStream = FileTransforms.getDecryptedStream(originalSourceStream);
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break;
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case NONE:
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inputStream = originalSourceStream;
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break;
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}
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bufferedInputStream = new BufferedInputStream(inputStream);
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bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(outputFile));
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checkMagicAndCopyFileTo(bufferedInputStream, bufferedOutputStream);
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bufferedOutputStream.flush();
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bufferedOutputStream.close();
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if (SHOULD_VERIFY_CHECKSUM) {
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final String actualRawChecksum = MD5Calculator.checksum(
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new BufferedInputStream(new FileInputStream(outputFile)));
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Log.i(TAG, "Computed checksum for downloaded dictionary. Expected = "
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+ rawChecksum + " ; actual = " + actualRawChecksum);
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if (!TextUtils.isEmpty(rawChecksum) && !rawChecksum.equals(actualRawChecksum)) {
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throw new IOException(
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"Could not decode the file correctly : checksum differs");
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}
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}
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// move the output file to the final staging file.
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final File finalFile = new File(finalFileName);
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if (!FileUtils.renameTo(outputFile, finalFile)) {
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Log.e(TAG, String.format("Failed to rename from %s to %s.",
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outputFile.getAbsoluteFile(), finalFile.getAbsoluteFile()));
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}
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wordListUriBuilder.appendQueryParameter(QUERY_PARAMETER_DELETE_RESULT,
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QUERY_PARAMETER_SUCCESS);
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if (0 >= providerClient.delete(wordListUriBuilder.build(), null, null)) {
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Log.e(TAG, "Could not have the dictionary pack delete a word list");
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}
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Log.d(TAG, "Successfully copied file for wordlist ID " + wordlistId);
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// Success! Close files (through the finally{} clause) and return.
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return;
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} catch (Exception e) {
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if (DEBUG) {
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Log.e(TAG, "Can't open word list in mode " + mode, e);
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}
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if (null != outputFile) {
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// This may or may not fail. The file may not have been created if the
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// exception was thrown before it could be. Hence, both failure and
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// success are expected outcomes, so we don't check the return value.
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outputFile.delete();
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}
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// Try the next method.
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} finally {
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// Ignore exceptions while closing files.
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closeAssetFileDescriptorAndReportAnyException(afd);
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closeCloseableAndReportAnyException(inputStream);
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closeCloseableAndReportAnyException(uncompressedStream);
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closeCloseableAndReportAnyException(decryptedStream);
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closeCloseableAndReportAnyException(bufferedInputStream);
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closeCloseableAndReportAnyException(bufferedOutputStream);
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}
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}
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// We could not copy the file at all. This is very unexpected.
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// I'd rather not print the word list ID to the log out of security concerns
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Log.e(TAG, "Could not copy a word list. Will not be able to use it.");
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// If we can't copy it we should warn the dictionary provider so that it can mark it
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// as invalid.
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reportBrokenFileToDictionaryProvider(providerClient, clientId, wordlistId);
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}
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public static boolean reportBrokenFileToDictionaryProvider(
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final ContentProviderClient providerClient, final String clientId,
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final String wordlistId) {
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try {
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final Uri.Builder wordListUriBuilder = getContentUriBuilderForType(clientId,
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providerClient, QUERY_PATH_DATAFILE, wordlistId /* extraPath */);
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wordListUriBuilder.appendQueryParameter(QUERY_PARAMETER_DELETE_RESULT,
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QUERY_PARAMETER_FAILURE);
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if (0 >= providerClient.delete(wordListUriBuilder.build(), null, null)) {
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Log.e(TAG, "Unable to delete a word list.");
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}
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} catch (RemoteException e) {
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Log.e(TAG, "Communication with the dictionary provider was cut", e);
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return false;
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}
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return true;
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}
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// Ideally the two following methods should be merged, but AssetFileDescriptor does not
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// implement Closeable although it does implement #close(), and Java does not have
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// structural typing.
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private static void closeAssetFileDescriptorAndReportAnyException(
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final AssetFileDescriptor file) {
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try {
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if (null != file) file.close();
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} catch (Exception e) {
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Log.e(TAG, "Exception while closing a file", e);
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}
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}
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private static void closeCloseableAndReportAnyException(final Closeable file) {
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try {
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if (null != file) file.close();
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} catch (Exception e) {
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Log.e(TAG, "Exception while closing a file", e);
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}
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}
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/**
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* Queries a content provider for word list data for some locale and stage the returned files
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*
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* This will query a content provider for word list data for a given locale, and copy the
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* files locally so that they can be mmap'ed. This may overwrite previously cached word lists
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* with newer versions if a newer version is made available by the content provider.
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* @throw FileNotFoundException if the provider returns non-existent data.
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* @throw IOException if the provider-returned data could not be read.
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*/
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public static void installDictToStagingFromContentProvider(final Locale locale,
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final Context context, final boolean hasDefaultWordList) {
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final ContentProviderClient providerClient;
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try {
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providerClient = context.getContentResolver().
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acquireContentProviderClient(getProviderUriBuilder("").build());
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} catch (final SecurityException e) {
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Log.e(TAG, "No permission to communicate with the dictionary provider", e);
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return;
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}
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if (null == providerClient) {
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Log.e(TAG, "Can't establish communication with the dictionary provider");
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return;
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}
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try {
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final List<WordListInfo> idList = getWordListWordListInfos(locale, context,
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hasDefaultWordList);
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for (WordListInfo id : idList) {
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installWordListToStaging(id.mId, id.mLocale, id.mRawChecksum, providerClient,
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context);
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}
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} finally {
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providerClient.release();
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}
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}
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/**
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* Downloads the dictionary if it was never requested/used.
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*
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* @param locale locale to download
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* @param context the context for resources and providers.
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* @param hasDefaultWordList whether the default wordlist exists in the resources.
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*/
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public static void downloadDictIfNeverRequested(final Locale locale,
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final Context context, final boolean hasDefaultWordList) {
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getWordListWordListInfos(locale, context, hasDefaultWordList);
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}
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/**
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* Copies the data in an input stream to a target file if the magic number matches.
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*
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* If the magic number does not match the expected value, this method throws an
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* IOException. Other usual conditions for IOException or FileNotFoundException
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* also apply.
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*
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* @param input the stream to be copied.
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* @param output an output stream to copy the data to.
|
|
*/
|
|
public static void checkMagicAndCopyFileTo(final BufferedInputStream input,
|
|
final BufferedOutputStream output) throws FileNotFoundException, IOException {
|
|
// Check the magic number
|
|
final int length = MAGIC_NUMBER_VERSION_2.length;
|
|
final byte[] magicNumberBuffer = new byte[length];
|
|
final int readMagicNumberSize = input.read(magicNumberBuffer, 0, length);
|
|
if (readMagicNumberSize < length) {
|
|
throw new IOException("Less bytes to read than the magic number length");
|
|
}
|
|
if (SHOULD_VERIFY_MAGIC_NUMBER) {
|
|
if (!Arrays.equals(MAGIC_NUMBER_VERSION_2, magicNumberBuffer)) {
|
|
if (!Arrays.equals(MAGIC_NUMBER_VERSION_1, magicNumberBuffer)) {
|
|
throw new IOException("Wrong magic number for downloaded file");
|
|
}
|
|
}
|
|
}
|
|
output.write(magicNumberBuffer);
|
|
|
|
// Actually copy the file
|
|
final byte[] buffer = new byte[FILE_READ_BUFFER_SIZE];
|
|
for (int readBytes = input.read(buffer); readBytes >= 0; readBytes = input.read(buffer)) {
|
|
output.write(buffer, 0, readBytes);
|
|
}
|
|
input.close();
|
|
}
|
|
|
|
private static void reinitializeClientRecordInDictionaryContentProvider(final Context context,
|
|
final ContentProviderClient client, final String clientId) throws RemoteException {
|
|
final String metadataFileUri = MetadataFileUriGetter.getMetadataUri(context);
|
|
Log.i(TAG, "reinitializeClientRecordInDictionaryContentProvider() : MetadataFileUri = "
|
|
+ metadataFileUri);
|
|
final String metadataAdditionalId = MetadataFileUriGetter.getMetadataAdditionalId(context);
|
|
// Tell the content provider to reset all information about this client id
|
|
final Uri metadataContentUri = getProviderUriBuilder(clientId)
|
|
.appendPath(QUERY_PATH_METADATA)
|
|
.appendQueryParameter(QUERY_PARAMETER_PROTOCOL, QUERY_PARAMETER_PROTOCOL_VALUE)
|
|
.build();
|
|
client.delete(metadataContentUri, null, null);
|
|
// Update the metadata URI
|
|
final ContentValues metadataValues = new ContentValues();
|
|
metadataValues.put(INSERT_METADATA_CLIENT_ID_COLUMN, clientId);
|
|
metadataValues.put(INSERT_METADATA_METADATA_URI_COLUMN, metadataFileUri);
|
|
metadataValues.put(INSERT_METADATA_METADATA_ADDITIONAL_ID_COLUMN, metadataAdditionalId);
|
|
client.insert(metadataContentUri, metadataValues);
|
|
|
|
// Update the dictionary list.
|
|
final Uri dictionaryContentUriBase = getProviderUriBuilder(clientId)
|
|
.appendPath(QUERY_PATH_DICT_INFO)
|
|
.appendQueryParameter(QUERY_PARAMETER_PROTOCOL, QUERY_PARAMETER_PROTOCOL_VALUE)
|
|
.build();
|
|
final ArrayList<DictionaryInfo> dictionaryList =
|
|
DictionaryInfoUtils.getCurrentDictionaryFileNameAndVersionInfo(context);
|
|
final int length = dictionaryList.size();
|
|
for (int i = 0; i < length; ++i) {
|
|
final DictionaryInfo info = dictionaryList.get(i);
|
|
Log.i(TAG, "reinitializeClientRecordInDictionaryContentProvider() : Insert " + info);
|
|
client.insert(Uri.withAppendedPath(dictionaryContentUriBase, info.mId),
|
|
info.toContentValues());
|
|
}
|
|
|
|
// Read from metadata file in resources to get the baseline dictionary info.
|
|
// This ensures we start with a valid list of available dictionaries.
|
|
final int metadataResourceId = context.getResources().getIdentifier("metadata",
|
|
"raw", DictionaryInfoUtils.RESOURCE_PACKAGE_NAME);
|
|
if (metadataResourceId == 0) {
|
|
Log.w(TAG, "Missing metadata.json resource");
|
|
return;
|
|
}
|
|
InputStream inputStream = null;
|
|
try {
|
|
inputStream = context.getResources().openRawResource(metadataResourceId);
|
|
UpdateHandler.handleMetadata(context, inputStream, clientId);
|
|
} catch (Exception e) {
|
|
Log.w(TAG, "Failed to read metadata.json from resources", e);
|
|
} finally {
|
|
if (inputStream != null) {
|
|
try {
|
|
inputStream.close();
|
|
} catch (IOException e) {
|
|
Log.w(TAG, "Failed to close metadata.json", e);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Initialize a client record with the dictionary content provider.
|
|
*
|
|
* This merely acquires the content provider and calls
|
|
* #reinitializeClientRecordInDictionaryContentProvider.
|
|
*
|
|
* @param context the context for resources and providers.
|
|
* @param clientId the client ID to use.
|
|
*/
|
|
public static void initializeClientRecordHelper(final Context context, final String clientId) {
|
|
try {
|
|
final ContentProviderClient client = context.getContentResolver().
|
|
acquireContentProviderClient(getProviderUriBuilder("").build());
|
|
if (null == client) return;
|
|
reinitializeClientRecordInDictionaryContentProvider(context, client, clientId);
|
|
} catch (RemoteException e) {
|
|
Log.e(TAG, "Cannot contact the dictionary content provider", e);
|
|
}
|
|
}
|
|
}
|