Upstream DownloadManagerService

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
new file mode 100644
index 0000000000000000000000000000000000000000..71045581966e282facd0f27ef8825eea041bed64
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
@@ -0,0 +1,719 @@
+// Copyright 2015 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.chrome.browser.download;
+
+import android.app.DownloadManager;
+import android.content.ActivityNotFoundException;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.SharedPreferences;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.os.Environment;
+import android.os.Handler;
+import android.preference.PreferenceManager;
+import android.support.v4.util.LongSparseArray;
+import android.text.TextUtils;
+import android.util.Log;
+import android.widget.Toast;
+
+import org.chromium.base.ThreadUtils;
+import org.chromium.base.VisibleForTesting;
+import org.chromium.chrome.R;
+import org.chromium.content.browser.DownloadController;
+import org.chromium.content.browser.DownloadInfo;
+
+import java.io.File;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Chrome implementation of the DownloadNotificationService interface. This class is responsible for
+ * keeping track of which downloads are in progress. It generates updates for progress of downloads
+ * and handles cleaning up of interrupted progress notifications.
+ */
+public class DownloadManagerService extends BroadcastReceiver implements
+        DownloadController.DownloadNotificationService {
+    private static final String TAG = "DownloadNotificationService";
+    private static final String DOWNLOAD_NOTIFICATION_IDS = "DownloadNotificationIds";
+    private static final String DOWNLOAD_DIRECTORY = "Download";
+    protected static final String PENDING_OMA_DOWNLOADS = "PendingOMADownloads";
+    private static final long UPDATE_DELAY_MILLIS = 1000;
+
+    private static DownloadManagerService sDownloadManagerService;
+
+    private final SharedPreferences mSharedPrefs;
+    private final ConcurrentHashMap<Integer, DownloadProgress> mDownloadProgressMap =
+            new ConcurrentHashMap<Integer, DownloadProgress>(4, 0.75f, 2);
+
+    private final DownloadNotifier mDownloadNotifier;
+    // Delay between UI updates.
+    private final long mUpdateDelayInMillis;
+
+    // Flag to track if we need to post a task to update download notifications.
+    private final AtomicBoolean mIsUIUpdateScheduled;
+    private final Handler mHandler;
+    private final Context mContext;
+
+    private final LongSparseArray<DownloadInfo> mPendingAutoOpenDownloads =
+            new LongSparseArray<DownloadInfo>();
+    private OMADownloadHandler mOMADownloadHandler;
+
+    /**
+     * Enum representing status of a download.
+     */
+    private enum DownloadStatus {
+        IN_PROGRESS,
+        COMPLETE,
+        FAILED
+    }
+
+    /**
+     * Class representing progress of a download.
+     */
+    private static class DownloadProgress {
+        final long mStartTimeInMillis;
+        volatile DownloadInfo mDownloadInfo;
+        volatile DownloadStatus mDownloadStatus;
+
+        DownloadProgress(long startTimeInMillis, DownloadInfo downloadInfo,
+                DownloadStatus downloadStatus) {
+            mStartTimeInMillis = startTimeInMillis;
+            mDownloadInfo = downloadInfo;
+            mDownloadStatus = downloadStatus;
+        }
+    }
+
+    /**
+     * Class representing an OMA download entry to be stored in SharedPrefs.
+     */
+    @VisibleForTesting
+    protected static class OMAEntry {
+        final long mDownloadId;
+        final String mInstallNotifyURI;
+
+        OMAEntry(long downloadId, String installNotifyURI) {
+            mDownloadId = downloadId;
+            mInstallNotifyURI = installNotifyURI;
+        }
+
+        /**
+         * Parse OMA entry from the SharedPrefs String
+         * TODO(qinmin): use a file instead of SharedPrefs to store the OMA entry.
+         *
+         * @param entry String contains the OMA information.
+         * @return an OMAEntry object.
+         */
+        @VisibleForTesting
+        static OMAEntry parseOMAEntry(String entry) {
+            int index = entry.indexOf(",");
+            long downloadId = Long.parseLong(entry.substring(0, index));
+            return new OMAEntry(downloadId, entry.substring(index + 1));
+        }
+
+        /**
+         * Generates a string for an OMA entry to be inserted into the SharedPrefs.
+         * TODO(qinmin): use a file instead of SharedPrefs to store the OMA entry.
+         *
+         * @return a String representing the download entry.
+         */
+        String generateSharedPrefsString() {
+            return String.valueOf(mDownloadId) + "," + mInstallNotifyURI;
+        }
+    }
+
+    /**
+     * Creates DownloadManagerService.
+     */
+    public static DownloadManagerService getDownloadManagerService(final Context context) {
+        ThreadUtils.assertOnUiThread();
+        assert context == context.getApplicationContext();
+        if (sDownloadManagerService == null) {
+            sDownloadManagerService = new DownloadManagerService(context,
+                    new SystemDownloadNotifier(context),  new Handler(), UPDATE_DELAY_MILLIS);
+        }
+        return sDownloadManagerService;
+    }
+
+    /**
+     * For tests only: sets the DownloadManagerService.
+     * @param service An instance of DownloadManagerService.
+     * @return Null or a currently set instance of DownloadManagerService.
+     */
+    @VisibleForTesting
+    public static DownloadManagerService setDownloadManagerService(DownloadManagerService service) {
+        ThreadUtils.assertOnUiThread();
+        DownloadManagerService prev = sDownloadManagerService;
+        sDownloadManagerService = service;
+        return prev;
+    }
+
+    @VisibleForTesting
+    protected DownloadManagerService(Context context,
+            DownloadNotifier downloadNotifier,
+            Handler handler,
+            long updateDelayInMillis) {
+        mContext = context;
+        mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(context
+                .getApplicationContext());
+        mDownloadNotifier = downloadNotifier;
+        mUpdateDelayInMillis = updateDelayInMillis;
+        mHandler = handler;
+        mIsUIUpdateScheduled = new AtomicBoolean(false);
+        mOMADownloadHandler = new OMADownloadHandler(context);
+    }
+
+    @Override
+    public void onDownloadCompleted(final DownloadInfo downloadInfo) {
+        DownloadStatus status = DownloadStatus.COMPLETE;
+        if (!downloadInfo.isSuccessful() || downloadInfo.getContentLength() == 0) {
+            status = DownloadStatus.FAILED;
+        }
+        updateDownloadProgress(downloadInfo, status);
+        scheduleUpdateIfNeeded();
+    }
+
+    @Override
+    public void onDownloadUpdated(final DownloadInfo downloadInfo) {
+        updateDownloadProgress(downloadInfo, DownloadStatus.IN_PROGRESS);
+        scheduleUpdateIfNeeded();
+    }
+
+    /**
+     * Clear any pending notifications for incomplete downloads by reading them from shared prefs.
+     * When Clank is restarted it clears any old notifications for incomplete downloads.
+     */
+    public void clearPendingDownloadNotifications() {
+        if (mSharedPrefs.contains(DOWNLOAD_NOTIFICATION_IDS)) {
+            Set<String> downloadIds = getStoredDownloadInfo(DOWNLOAD_NOTIFICATION_IDS);
+            for (String id : downloadIds) {
+                int notificationId = parseNotificationId(id);
+                if (notificationId > 0) {
+                    mDownloadNotifier.cancelNotification(notificationId);
+                    Log.w(TAG, "Download failed: Cleared download id:" + id);
+                }
+            }
+            mSharedPrefs.edit().remove(DOWNLOAD_NOTIFICATION_IDS);
+            mSharedPrefs.edit().apply();
+        }
+        if (mSharedPrefs.contains(PENDING_OMA_DOWNLOADS)) {
+            Set<String> omaDownloads = getStoredDownloadInfo(PENDING_OMA_DOWNLOADS);
+            for (String omaDownload : omaDownloads) {
+                OMAEntry entry = OMAEntry.parseOMAEntry(omaDownload);
+                clearPendingOMADownload(entry.mDownloadId, entry.mInstallNotifyURI);
+            }
+        }
+    }
+
+    /**
+     * Async task to clear the pending OMA download from SharedPrefs and inform
+     * the OMADownloadHandler about download status.
+     */
+    private class ClearPendingOMADownloadTask extends AsyncTask<Void, Void, Integer> {
+        private DownloadInfo mDownloadInfo;
+        private final long mDownloadId;
+        private final String mInstallNotifyURI;
+        private int mFailureReason;
+
+        public ClearPendingOMADownloadTask(long downloadId, String installNotifyURI) {
+            mDownloadId = downloadId;
+            mInstallNotifyURI = installNotifyURI;
+            mDownloadInfo = mPendingAutoOpenDownloads.get(downloadId);
+        }
+
+        @Override
+        public Integer doInBackground(Void...voids) {
+            DownloadManager manager =
+                    (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
+            Cursor c = manager.query(new DownloadManager.Query().setFilterById(mDownloadId));
+            int statusIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
+            int reasonIndex = c.getColumnIndex(DownloadManager.COLUMN_REASON);
+            int filenameIndex = c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME);
+            while (c.moveToNext()) {
+                int status = c.getInt(statusIndex);
+                if (mDownloadInfo == null) {
+                    // Chrome has been killed, reconstruct a DownloadInfo.
+                    mDownloadInfo = new DownloadInfo.Builder()
+                            .setDownloadId((int) mDownloadId)
+                            .setDescription(c.getString(
+                                    c.getColumnIndex(DownloadManager.COLUMN_DESCRIPTION)))
+                            .setMimeType(c.getString(
+                                    c.getColumnIndex(DownloadManager.COLUMN_MEDIA_TYPE)))
+                            .setContentLength(Long.parseLong(c.getString(
+                                    c.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES))))
+                            .build();
+                }
+                if (status == DownloadManager.STATUS_SUCCESSFUL) {
+                    mDownloadInfo = DownloadInfo.Builder.fromDownloadInfo(mDownloadInfo)
+                            .setFilePath(c.getString(filenameIndex))
+                            .build();
+                } else if (status == DownloadManager.STATUS_FAILED) {
+                    mFailureReason = c.getInt(reasonIndex);
+                    manager.remove(mDownloadId);
+                }
+                return status;
+            }
+            return DownloadManager.STATUS_FAILED;
+        }
+
+        @Override
+        protected void onPostExecute(Integer result) {
+            if (result == DownloadManager.STATUS_SUCCESSFUL) {
+                mOMADownloadHandler.onDownloadCompleted(mDownloadInfo, mInstallNotifyURI);
+                removeOMADownloadFromSharedPrefs(mDownloadId);
+            } else if (result == DownloadManager.STATUS_FAILED) {
+                mOMADownloadHandler.onDownloadFailed(
+                        mDownloadInfo, mFailureReason, mInstallNotifyURI);
+                removeOMADownloadFromSharedPrefs(mDownloadId);
+            }
+        }
+    }
+
+    /**
+     * Clear pending OMA downloads for a particular download ID.
+     *
+     * @param downloadId Download identifier.
+     * @param info Information about the download.
+     * @param installNotifyURI URI to notify after installation.
+     */
+    private void clearPendingOMADownload(long downloadId, String installNotifyURI) {
+        ClearPendingOMADownloadTask task = new ClearPendingOMADownloadTask(
+                downloadId, installNotifyURI);
+        task.execute();
+    }
+
+    /**
+     * Parse the notification ID from a String object.
+     *
+     * @param id String containing the notification ID.
+     * @return notification ID.
+     */
+    private static int parseNotificationId(String id) {
+        try {
+            return Integer.parseInt(id);
+        } catch (NumberFormatException nfe) {
+            Log.w(TAG, "Exception while parsing download id:" + id);
+            return -1;
+        }
+    }
+
+    /**
+     * Broadcast that a download was successful.
+     * @param downloadInfo info about the download.
+     */
+    protected void broadcastDownloadSuccessful(DownloadInfo downloadInfo) {}
+
+    /**
+     * Gets download information from SharedPrefs.
+     * @param type Type of the information to retrieve.
+     * @return download information saved to the SharedPrefs for the given type.
+     */
+    @VisibleForTesting
+    protected Set<String> getStoredDownloadInfo(String type) {
+        return new HashSet<String>(mSharedPrefs.getStringSet(
+                type, new HashSet<String>()));
+    }
+
+    /**
+     * Removes a donwload Id from SharedPrefs.
+     * @param downloadId ID to be removed.
+     */
+    private void removeDownloadIdFromSharedPrefs(int downloadId) {
+        Set<String> downloadIds = getStoredDownloadInfo(DOWNLOAD_NOTIFICATION_IDS);
+        String id = Integer.toString(downloadId);
+        if (downloadIds.contains(id)) {
+            downloadIds.remove(id);
+            storeDownloadInfo(DOWNLOAD_NOTIFICATION_IDS, downloadIds);
+        }
+    }
+
+    /**
+     * Add download ID to SharedPrefs.
+     * @param downloadId ID to be stored.
+     */
+    private void addDownloadIdToSharedPrefs(int downloadId) {
+        Set<String> downloadIds = getStoredDownloadInfo(DOWNLOAD_NOTIFICATION_IDS);
+        downloadIds.add(Integer.toString(downloadId));
+        storeDownloadInfo(DOWNLOAD_NOTIFICATION_IDS, downloadIds);
+    }
+
+    /**
+     * Add OMA download info to SharedPrefs.
+     * @param omaInfo OMA download information to save.
+     */
+    @VisibleForTesting
+    protected void addOMADownloadToSharedPrefs(String omaInfo) {
+        Set<String> omaDownloads = getStoredDownloadInfo(PENDING_OMA_DOWNLOADS);
+        omaDownloads.add(omaInfo);
+        storeDownloadInfo(PENDING_OMA_DOWNLOADS, omaDownloads);
+    }
+
+    /**
+     * Remove OMA download info from SharedPrefs.
+     * @param downloadId ID to be removed.
+     */
+    private void removeOMADownloadFromSharedPrefs(long downloadId) {
+        Set<String> omaDownloads = getStoredDownloadInfo(PENDING_OMA_DOWNLOADS);
+        for (String omaDownload : omaDownloads) {
+            OMAEntry entry = OMAEntry.parseOMAEntry(omaDownload);
+            if (entry.mDownloadId == downloadId) {
+                omaDownloads.remove(omaDownload);
+                storeDownloadInfo(PENDING_OMA_DOWNLOADS, omaDownloads);
+                return;
+            }
+        }
+    }
+
+    /**
+     * Check if a download ID is in OMA SharedPrefs.
+     * @param downloadId Download identifier to check.
+     * @param true if it is in the SharedPrefs, or false otherwise.
+     */
+    private boolean isDownloadIdInOMASharedPrefs(long downloadId) {
+        Set<String> omaDownloads = getStoredDownloadInfo(PENDING_OMA_DOWNLOADS);
+        for (String omaDownload : omaDownloads) {
+            OMAEntry entry = OMAEntry.parseOMAEntry(omaDownload);
+            if (entry.mDownloadId == downloadId) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Stores download information to shared preferences. The information can be
+     * either pending download IDs, or pending OMA downloads.
+     *
+     * @param type Type of the information.
+     * @param downloadInfo Information to be saved.
+     */
+    private void storeDownloadInfo(String type, Set<String> downloadInfo) {
+        SharedPreferences.Editor editor = mSharedPrefs.edit();
+        if (downloadInfo.isEmpty()) {
+            editor.remove(type);
+        } else {
+            editor.putStringSet(type, downloadInfo);
+        }
+        editor.apply();
+    }
+
+    /**
+     * Updates notifications for all current downloads. Should not be called from UI thread.
+     */
+    private void updateAllNotifications() {
+        assert !ThreadUtils.runningOnUiThread();
+        for (DownloadProgress progress : mDownloadProgressMap.values()) {
+            if (progress != null) {
+                switch (progress.mDownloadStatus) {
+                    case COMPLETE:
+                        removeProgressNotificationForDownload(progress.mDownloadInfo
+                                .getDownloadId());
+                        mDownloadNotifier.notifyDownloadSuccessful(progress.mDownloadInfo);
+                        broadcastDownloadSuccessful(progress.mDownloadInfo);
+                        break;
+                    case FAILED:
+                        removeProgressNotificationForDownload(progress.mDownloadInfo
+                                .getDownloadId());
+                        mDownloadNotifier.notifyDownloadFailed(progress.mDownloadInfo);
+                        Log.w(TAG, "Download failed: " + progress.mDownloadInfo.getFilePath());
+                        break;
+                    case IN_PROGRESS:
+                        mDownloadNotifier.notifyDownloadProgress(progress.mDownloadInfo,
+                                progress.mStartTimeInMillis);
+                }
+            }
+        }
+    }
+
+    /**
+     * Schedule an update if there is no update scheduled.
+     */
+    private void scheduleUpdateIfNeeded() {
+        if (mIsUIUpdateScheduled.compareAndSet(false, true)) {
+            Runnable updateTask = new Runnable() {
+                @Override
+                public void run() {
+                    new AsyncTask<Void, Void, Void>() {
+                        @Override
+                        public Void doInBackground(Void... params) {
+                            updateAllNotifications();
+                            return null;
+                        }
+                    }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+                    mIsUIUpdateScheduled.set(false);
+                }
+            };
+            mHandler.postDelayed(updateTask, mUpdateDelayInMillis);
+        }
+    }
+
+    /**
+     * Cancel the progress notification of download and clear any cached information about this
+     * download.
+     *
+     * @param downloadId Download Identifier.
+     */
+    private void removeProgressNotificationForDownload(int downloadId) {
+        mDownloadProgressMap.remove(downloadId);
+        mDownloadNotifier.cancelNotification(downloadId);
+        removeDownloadIdFromSharedPrefs(downloadId);
+    }
+
+    /**
+     * Updates the progress of a download.
+     *
+     * @param downloadInfo Information about the download.
+     * @param status Status of the download.
+     */
+    private void updateDownloadProgress(DownloadInfo downloadInfo, DownloadStatus status) {
+        assert downloadInfo.hasDownloadId();
+        int downloadId = downloadInfo.getDownloadId();
+        DownloadProgress progress = mDownloadProgressMap.get(downloadId);
+        if (progress == null) {
+            progress = new DownloadProgress(System.currentTimeMillis(), downloadInfo,
+                    status);
+            if (status == DownloadStatus.IN_PROGRESS) {
+                // A new in-progress download, add an entry to shared prefs to make sure
+                // to clear the notification.
+                addDownloadIdToSharedPrefs(downloadId);
+            }
+            mDownloadProgressMap.putIfAbsent(downloadId, progress);
+        } else {
+            progress.mDownloadStatus = status;
+            progress.mDownloadInfo = downloadInfo;
+        }
+    }
+
+    /**
+     * Sets the download handler for OMA downloads, for testing purpose.
+     *
+     * @param omaDownloadHandler Download handler for OMA contents.
+     */
+    @VisibleForTesting
+    protected void setOMADownloadHandler(OMADownloadHandler omaDownloadHandler) {
+        mOMADownloadHandler = omaDownloadHandler;
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        String action = intent.getAction();
+        if (!DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) return;
+        final DownloadManager manager =
+                (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
+
+        long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
+        if (downloadId == -1) return;
+        boolean isPendingOMADownload = mOMADownloadHandler.isPendingOMADownload(downloadId);
+        boolean isInOMASharedPrefs = isDownloadIdInOMASharedPrefs(downloadId);
+        if (isPendingOMADownload || isInOMASharedPrefs) {
+            clearPendingOMADownload(downloadId, null);
+            mPendingAutoOpenDownloads.remove(downloadId);
+        } else if (mPendingAutoOpenDownloads.get(downloadId) != null) {
+            Cursor c = manager.query(new DownloadManager.Query().setFilterById(downloadId));
+            int statusIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
+            while (c.moveToNext()) {
+                int status = c.getInt(statusIndex);
+                DownloadInfo info = mPendingAutoOpenDownloads.get(downloadId);
+                switch (status) {
+                    case DownloadManager.STATUS_SUCCESSFUL:
+                        try {
+                            mPendingAutoOpenDownloads.remove(downloadId);
+                            if (OMADownloadHandler.OMA_DOWNLOAD_DESCRIPTOR_MIME.equalsIgnoreCase(
+                                    info.getMimeType())) {
+                                mOMADownloadHandler.handleOMADownload(
+                                        info, downloadId);
+                                manager.remove(downloadId);
+                                break;
+                            }
+                            Uri uri = manager.getUriForDownloadedFile(downloadId);
+                            Intent launchIntent = new Intent(Intent.ACTION_VIEW);
+
+                            launchIntent.setDataAndType(
+                                    uri, manager.getMimeTypeForDownloadedFile(downloadId));
+                            launchIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+                            mContext.startActivity(launchIntent);
+                        } catch (ActivityNotFoundException e) {
+                            Log.w(TAG, "Activity not found.");
+                        }
+                        break;
+                    case DownloadManager.STATUS_FAILED:
+                        mPendingAutoOpenDownloads.remove(downloadId);
+                        break;
+                    default:
+                        break;
+                }
+            }
+        }
+
+        if (mPendingAutoOpenDownloads.size() == 0) {
+            mContext.unregisterReceiver(this);
+        }
+    }
+
+    /**
+     * Sends the download request to Android download manager. If |notifyCompleted| is true,
+     * a notification will be sent to the user once download is complete and the downloaded
+     * content will be saved to the public directory on external storage. Otherwise, the
+     * download will be saved in the app directory and user will not get any notifications
+     * after download completion.
+     *
+     * @param info Download information about the download.
+     * @param notifyCompleted Whether to notify the user after Downloadmanager completes the
+     *                        download.
+     */
+    public void enqueueDownloadManagerRequest(final DownloadInfo info, boolean notifyCompleted) {
+        EnqueueDownloadRequestTask task = new EnqueueDownloadRequestTask(info);
+        task.execute(notifyCompleted);
+    }
+
+    /**
+     * Async task to enqueue a download request into DownloadManager.
+     */
+    private class EnqueueDownloadRequestTask extends
+            AsyncTask<Boolean, Void, Boolean> {
+        private int mErrorId;
+        private long mDownloadId;
+        private DownloadInfo mDownloadInfo;
+
+        public EnqueueDownloadRequestTask(DownloadInfo downloadInfo) {
+            mDownloadInfo = downloadInfo;
+        }
+
+        @Override
+        public Boolean doInBackground(Boolean... booleans) {
+            boolean notifyCompleted = booleans[0];
+            Uri uri = Uri.parse(mDownloadInfo.getUrl());
+            DownloadManager.Request request;
+            try {
+                request = new DownloadManager.Request(uri);
+            } catch (IllegalArgumentException e) {
+                mErrorId = R.string.cannot_download_http_or_https;
+                return false;
+            }
+
+            request.setMimeType(mDownloadInfo.getMimeType());
+            try {
+                if (notifyCompleted) {
+                    // Set downloaded file destination to /sdcard/Download or, should it be
+                    // set to one of several Environment.DIRECTORY* dirs depending on mimetype?
+                    request.setDestinationInExternalPublicDir(
+                            Environment.DIRECTORY_DOWNLOADS, mDownloadInfo.getFileName());
+                } else {
+                    File dir = new File(mContext.getExternalFilesDir(null), DOWNLOAD_DIRECTORY);
+                    if (dir.mkdir() || dir.isDirectory()) {
+                        File file = new File(dir, mDownloadInfo.getFileName());
+                        request.setDestinationUri(Uri.fromFile(file));
+                    } else {
+                        mErrorId = R.string.cannot_create_download_directory_title;
+                        return false;
+                    }
+                }
+            } catch (IllegalStateException e) {
+                mErrorId = R.string.cannot_create_download_directory_title;
+                return false;
+            }
+
+            if (notifyCompleted) {
+                // Let this downloaded file be scanned by MediaScanner - so that it can
+                // show up in Gallery app, for example.
+                request.allowScanningByMediaScanner();
+                request.setNotificationVisibility(
+                        DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+            } else {
+                request.setNotificationVisibility(
+                        DownloadManager.Request.VISIBILITY_VISIBLE);
+            }
+            String description = mDownloadInfo.getDescription();
+            if (TextUtils.isEmpty(description)) {
+                description = mDownloadInfo.getFileName();
+            }
+            request.setDescription(description);
+            request.addRequestHeader("Cookie", mDownloadInfo.getCookie());
+            request.addRequestHeader("Referer", mDownloadInfo.getReferer());
+            request.addRequestHeader("User-Agent", mDownloadInfo.getUserAgent());
+
+            DownloadManager manager =
+                    (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
+            try {
+                mDownloadId = manager.enqueue(request);
+            } catch (IllegalArgumentException e) {
+                // See crbug.com/143499 for more details.
+                Log.e(TAG, "Download failed: " + e);
+                mErrorId = R.string.cannot_download_generic;
+                return false;
+            }
+            return true;
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            boolean isPendingOMADownload = mOMADownloadHandler.isPendingOMADownload(
+                    (long) mDownloadInfo.getDownloadId());
+            if (!result) {
+                Toast.makeText(mContext, mErrorId, Toast.LENGTH_SHORT).show();
+                if (isPendingOMADownload) {
+                    mOMADownloadHandler.onDownloadFailed(
+                            mDownloadInfo, DownloadManager.ERROR_UNKNOWN, null);
+                }
+                return;
+            }
+            Toast.makeText(mContext, R.string.download_pending, Toast.LENGTH_SHORT).show();
+            if (isPendingOMADownload) {
+                // A new downloadId is generated, needs to update the OMADownloadHandler
+                // about this.
+                mDownloadInfo = mOMADownloadHandler.updateDownloadInfo(
+                        mDownloadInfo, mDownloadId);
+                // TODO(qinmin): use a file instead of shared prefs to save the
+                // OMA information in case chrome is killed. This will allow us to
+                // save more information like cookies and user agent.
+                String notifyUri = mOMADownloadHandler.getInstallNotifyInfo(mDownloadId);
+                if (!TextUtils.isEmpty(notifyUri)) {
+                    OMAEntry entry = new OMAEntry(mDownloadId, notifyUri);
+                    addOMADownloadToSharedPrefs(entry.generateSharedPrefsString());
+                }
+            }
+            if (shouldOpenAfterDownload(mDownloadInfo) || isPendingOMADownload) {
+                if (mPendingAutoOpenDownloads.size() == 0) {
+                    mContext.registerReceiver(DownloadManagerService.this,
+                            new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
+                }
+                mPendingAutoOpenDownloads.put(mDownloadId, mDownloadInfo);
+            }
+        }
+    }
+
+    /**
+     * Determines if the download should be immediately opened after
+     * downloading.
+     *
+     * @param downloadInfo Information about the download.
+     * @return true if the downloaded content should be opened, or false otherwise.
+     */
+    @VisibleForTesting
+    static boolean shouldOpenAfterDownload(DownloadInfo downloadInfo) {
+        String type = downloadInfo.getMimeType();
+        return downloadInfo.hasUserGesture()
+                && !isAttachment(downloadInfo.getContentDisposition())
+                && (type.equalsIgnoreCase("application/pdf")
+                        || type.equalsIgnoreCase(OMADownloadHandler.OMA_DOWNLOAD_DESCRIPTOR_MIME));
+    }
+
+    /**
+     * Returns true if the download meant to be treated as an attachment.
+     *
+     * @param contentDisposition Content disposition of the download.
+     * @return true if the downloaded is an attachment, or false otherwise.
+     */
+    public static boolean isAttachment(String contentDisposition) {
+        return contentDisposition != null
+                && contentDisposition.regionMatches(true, 0, "attachment", 0, 10);
+    }
+}