Migrate ResourceExtractor.java inside org.chromium.base package.

content/public/android/java/src/org/chromium/content/browser/ResourceExtractor.java

Index: content/public/android/java/src/org/chromium/content/browser/ResourceExtractor.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ResourceExtractor.java b/content/public/android/java/src/org/chromium/content/browser/ResourceExtractor.java
deleted file mode 100644
index d882f9425a6953ec65ceb3162d540dda992e6b2b..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/ResourceExtractor.java
+++ /dev/null
@@ -1,353 +0,0 @@
-// Copyright 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.content.browser;
-
-import android.content.Context;
-import android.content.SharedPreferences;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager;
-import android.content.res.AssetManager;
-import android.os.AsyncTask;
-import android.preference.PreferenceManager;
-import android.util.Log;
-
-import org.chromium.base.PathUtils;
-import org.chromium.ui.base.LocalizationUtils;
-
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.FilenameFilter;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.util.HashSet;
-import java.util.concurrent.CancellationException;
-import java.util.concurrent.ExecutionException;
-import java.util.regex.Pattern;
-
-/**
- * Handles extracting the necessary resources bundled in an APK and moving them to a location on
- * the file system accessible from the native code.
- */
-public class ResourceExtractor {
-
-    private static final String LOGTAG = "ResourceExtractor";
-    private static final String LAST_LANGUAGE = "Last language";
-    private static final String PAK_FILENAMES = "Pak filenames";
-    private static final String ICU_DATA_FILENAME = "icudtl.dat";
-
-    private static String[] sMandatoryPaks = null;
-
-    // By default, we attempt to extract a pak file for the users
-    // current device locale. Use setExtractImplicitLocale() to
-    // change this behavior.
-    private static boolean sExtractImplicitLocalePak = true;
-
-    private class ExtractTask extends AsyncTask<Void, Void, Void> {
-        private static final int BUFFER_SIZE = 16 * 1024;
-
-        public ExtractTask() {
-        }
-
-        @Override
-        protected Void doInBackground(Void... unused) {
-            final File outputDir = getOutputDir();
-            if (!outputDir.exists() && !outputDir.mkdirs()) {
-                Log.e(LOGTAG, "Unable to create pak resources directory!");
-                return null;
-            }
-
-            String timestampFile = checkPakTimestamp(outputDir);
-            if (timestampFile != null) {
-                deleteFiles();
-            }
-
-            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext);
-            HashSet<String> filenames = (HashSet<String>) prefs.getStringSet(
-                    PAK_FILENAMES, new HashSet<String>());
-            String currentLocale = LocalizationUtils.getDefaultLocale();
-            String currentLanguage = currentLocale.split("-", 2)[0];
-
-            if (prefs.getString(LAST_LANGUAGE, "").equals(currentLanguage)
-                    &&  filenames.size() >= sMandatoryPaks.length) {
-                boolean filesPresent = true;
-                for (String file : filenames) {
-                    if (!new File(outputDir, file).exists()) {
-                        filesPresent = false;
-                        break;
-                    }
-                }
-                if (filesPresent) return null;
-            } else {
-                prefs.edit().putString(LAST_LANGUAGE, currentLanguage).apply();
-            }
-
-            StringBuilder p = new StringBuilder();
-            for (String mandatoryPak : sMandatoryPaks) {
-                if (p.length() > 0) p.append('|');
-                p.append("\\Q" + mandatoryPak + "\\E");
-            }
-
-            if (sExtractImplicitLocalePak) {
-                if (p.length() > 0) p.append('|');
-                // As well as the minimum required set of .paks above, we'll also add all .paks that
-                // we have for the user's currently selected language.
-
-                p.append(currentLanguage);
-                p.append("(-\\w+)?\\.pak");
-            }
-
-            Pattern paksToInstall = Pattern.compile(p.toString());
-
-            AssetManager manager = mContext.getResources().getAssets();
-            try {
-                // Loop through every asset file that we have in the APK, and look for the
-                // ones that we need to extract by trying to match the Patterns that we
-                // created above.
-                byte[] buffer = null;
-                String[] files = manager.list("");
-                for (String file : files) {
-                    if (!paksToInstall.matcher(file).matches()) {
-                        continue;
-                    }
-                    boolean isICUData = file.equals(ICU_DATA_FILENAME);
-                    File output = new File(isICUData ? getAppDataDir() : outputDir, file);
-                    if (output.exists()) {
-                        continue;
-                    }
-
-                    InputStream is = null;
-                    OutputStream os = null;
-                    try {
-                        is = manager.open(file);
-                        os = new FileOutputStream(output);
-                        Log.i(LOGTAG, "Extracting resource " + file);
-                        if (buffer == null) {
-                            buffer = new byte[BUFFER_SIZE];
-                        }
-
-                        int count = 0;
-                        while ((count = is.read(buffer, 0, BUFFER_SIZE)) != -1) {
-                            os.write(buffer, 0, count);
-                        }
-                        os.flush();
-
-                        // Ensure something reasonable was written.
-                        if (output.length() == 0) {
-                            throw new IOException(file + " extracted with 0 length!");
-                        }
-
-                        if (!isICUData) {
-                            filenames.add(file);
-                        } else {
-                            // icudata needs to be accessed by a renderer process.
-                            output.setReadable(true, false);
-                        }
-                    } finally {
-                        try {
-                            if (is != null) {
-                                is.close();
-                            }
-                        } finally {
-                            if (os != null) {
-                                os.close();
-                            }
-                        }
-                    }
-                }
-            } catch (IOException e) {
-                // TODO(benm): See crbug/152413.
-                // Try to recover here, can we try again after deleting files instead of
-                // returning null? It might be useful to gather UMA here too to track if
-                // this happens with regularity.
-                Log.w(LOGTAG, "Exception unpacking required pak resources: " + e.getMessage());
-                deleteFiles();
-                return null;
-            }
-
-            // Finished, write out a timestamp file if we need to.
-
-            if (timestampFile != null) {
-                try {
-                    new File(outputDir, timestampFile).createNewFile();
-                } catch (IOException e) {
-                    // Worst case we don't write a timestamp, so we'll re-extract the resource
-                    // paks next start up.
-                    Log.w(LOGTAG, "Failed to write resource pak timestamp!");
-                }
-            }
-            // TODO(yusufo): Figure out why remove is required here.
-            prefs.edit().remove(PAK_FILENAMES).apply();
-            prefs.edit().putStringSet(PAK_FILENAMES, filenames).apply();
-            return null;
-        }
-
-        // Looks for a timestamp file on disk that indicates the version of the APK that
-        // the resource paks were extracted from. Returns null if a timestamp was found
-        // and it indicates that the resources match the current APK. Otherwise returns
-        // a String that represents the filename of a timestamp to create.
-        // Note that we do this to avoid adding a BroadcastReceiver on
-        // android.content.Intent#ACTION_PACKAGE_CHANGED as that causes process churn
-        // on (re)installation of *all* APK files.
-        private String checkPakTimestamp(File outputDir) {
-            final String timestampPrefix = "pak_timestamp-";
-            PackageManager pm = mContext.getPackageManager();
-            PackageInfo pi = null;
-
-            try {
-                pi = pm.getPackageInfo(mContext.getPackageName(), 0);
-            } catch (PackageManager.NameNotFoundException e) {
-                return timestampPrefix;
-            }
-
-            if (pi == null) {
-                return timestampPrefix;
-            }
-
-            String expectedTimestamp = timestampPrefix + pi.versionCode + "-" + pi.lastUpdateTime;
-
-            String[] timestamps = outputDir.list(new FilenameFilter() {
-                @Override
-                public boolean accept(File dir, String name) {
-                    return name.startsWith(timestampPrefix);
-                }
-            });
-
-            if (timestamps.length != 1) {
-                // If there's no timestamp, nuke to be safe as we can't tell the age of the files.
-                // If there's multiple timestamps, something's gone wrong so nuke.
-                return expectedTimestamp;
-            }
-
-            if (!expectedTimestamp.equals(timestamps[0])) {
-                return expectedTimestamp;
-            }
-
-            // timestamp file is already up-to date.
-            return null;
-        }
-    }
-
-    private final Context mContext;
-    private ExtractTask mExtractTask;
-
-    private static ResourceExtractor sInstance;
-
-    public static ResourceExtractor get(Context context) {
-        if (sInstance == null) {
-            sInstance = new ResourceExtractor(context);
-        }
-        return sInstance;
-    }
-
-    /**
-     * Specifies the .pak files that should be extracted from the APK's asset resources directory
-     * and moved to {@link #getOutputDirFromContext(Context)}.
-     * @param mandatoryPaks The list of pak files to be loaded. If no pak files are
-     *     required, pass a single empty string.
-     */
-    public static void setMandatoryPaksToExtract(String... mandatoryPaks) {
-        assert (sInstance == null || sInstance.mExtractTask == null)
-                : "Must be called before startExtractingResources is called";
-        sMandatoryPaks = mandatoryPaks;
-
-    }
-
-    /**
-     * By default the ResourceExtractor will attempt to extract a pak resource for the users
-     * currently specified locale. This behavior can be changed with this function and is
-     * only needed by tests.
-     * @param extract False if we should not attempt to extract a pak file for
-     *         the users currently selected locale and try to extract only the
-     *         pak files specified in sMandatoryPaks.
-     */
-    public static void setExtractImplicitLocaleForTesting(boolean extract) {
-        assert (sInstance == null || sInstance.mExtractTask == null)
-                : "Must be called before startExtractingResources is called";
-        sExtractImplicitLocalePak = extract;
-    }
-
-    private ResourceExtractor(Context context) {
-        mContext = context.getApplicationContext();
-    }
-
-    public void waitForCompletion() {
-        if (shouldSkipPakExtraction()) {
-            return;
-        }
-
-        assert mExtractTask != null;
-
-        try {
-            mExtractTask.get();
-        } catch (CancellationException e) {
-            // Don't leave the files in an inconsistent state.
-            deleteFiles();
-        } catch (ExecutionException e2) {
-            deleteFiles();
-        } catch (InterruptedException e3) {
-            deleteFiles();
-        }
-    }
-
-    /**
-     * This will extract the application pak resources in an
-     * AsyncTask. Call waitForCompletion() at the point resources
-     * are needed to block until the task completes.
-     */
-    public void startExtractingResources() {
-        if (mExtractTask != null) {
-            return;
-        }
-
-        if (shouldSkipPakExtraction()) {
-            return;
-        }
-
-        mExtractTask = new ExtractTask();
-        mExtractTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
-    }
-
-    private File getAppDataDir() {
-        return new File(PathUtils.getDataDirectory(mContext));
-    }
-
-    private File getOutputDir() {
-        return new File(getAppDataDir(), "paks");
-    }
-
-    /**
-     * Pak files (UI strings and other resources) should be updated along with
-     * Chrome. A version mismatch can lead to a rather broken user experience.
-     * The ICU data (icudtl.dat) is less version-sensitive, but still can
-     * lead to malfunction/UX misbehavior. So, we regard failing to update them
-     * as an error.
-     */
-    private void deleteFiles() {
-        File icudata = new File(getAppDataDir(), ICU_DATA_FILENAME);
-        if (icudata.exists() && !icudata.delete()) {
-            Log.e(LOGTAG, "Unable to remove the icudata " + icudata.getName());
-        }
-        File dir = getOutputDir();
-        if (dir.exists()) {
-            File[] files = dir.listFiles();
-            for (File file : files) {
-                if (!file.delete()) {
-                    Log.e(LOGTAG, "Unable to remove existing resource " + file.getName());
-                }
-            }
-        }
-    }
-
-    /**
-     * Pak extraction not necessarily required by the embedder; we allow them to skip
-     * this process if they call setMandatoryPaksToExtract with a single empty String.
-     */
-    private static boolean shouldSkipPakExtraction() {
-        // Must call setMandatoryPaksToExtract before beginning resource extraction.
-        assert sMandatoryPaks != null;
-        return sMandatoryPaks.length == 1 && "".equals(sMandatoryPaks[0]);
-    }
-}