src/com/android/providers/downloads/DownloadService.java

   1 /*
   2  * Copyright (C) 2008 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.android.providers.downloads;
  18
  19 import com.google.android.collect.Lists;
  20
  21 import android.app.AlarmManager;
  22 import android.app.PendingIntent;
  23 import android.app.Service;
  24 import android.content.ComponentName;
  25 import android.content.ContentUris;
  26 import android.content.ContentValues;
  27 import android.content.Context;
  28 import android.content.Intent;
  29 import android.content.ServiceConnection;
  30 import android.content.pm.PackageManager;
  31 import android.content.pm.ResolveInfo;
  32 import android.database.CharArrayBuffer;
  33 import android.database.ContentObserver;
  34 import android.database.Cursor;
  35 import android.drm.mobile1.DrmRawContent;
  36 import android.media.IMediaScannerService;
  37 import android.net.Uri;
  38 import android.os.Environment;
  39 import android.os.Handler;
  40 import android.os.IBinder;
  41 import android.os.Process;
  42 import android.os.RemoteException;
  43 import android.provider.Downloads;
  44 import android.util.Config;
  45 import android.util.Log;
  46
  47 import java.io.File;
  48 import java.util.ArrayList;
  49 import java.util.HashSet;
  50 import java.util.Iterator;
  51 import java.util.List;
  52
  53
  54 /**
  55  * Performs the background downloads requested by applications that use the Downloads provider.
  56  */
  57 public class DownloadService extends Service {
  58
  59     /* ------------ Constants ------------ */
  60
  61     /* ------------ Members ------------ */
  62
  63     /** Observer to get notified when the content observer's data changes */
  64     private DownloadManagerContentObserver mObserver;
  65
  66     /** Class to handle Notification Manager updates */
  67     private DownloadNotification mNotifier;
  68
  69     /**
  70      * The Service's view of the list of downloads. This is kept independently
  71      * from the content provider, and the Service only initiates downloads
  72      * based on this data, so that it can deal with situation where the data
  73      * in the content provider changes or disappears.
  74      */
  75     private ArrayList<DownloadInfo> mDownloads;
  76
  77     /**
  78      * The thread that updates the internal download list from the content
  79      * provider.
  80      */
  81     private UpdateThread mUpdateThread;
  82
  83     /**
  84      * Whether the internal download list should be updated from the content
  85      * provider.
  86      */
  87     private boolean mPendingUpdate;
  88
  89     /**
  90      * The ServiceConnection object that tells us when we're connected to and disconnected from
  91      * the Media Scanner
  92      */
  93     private MediaScannerConnection mMediaScannerConnection;
  94
  95     private boolean mMediaScannerConnecting;
  96
  97     /**
  98      * The IPC interface to the Media Scanner
  99      */
 100     private IMediaScannerService mMediaScannerService;
 101
 102     /**
 103      * Array used when extracting strings from content provider
 104      */
 105     private CharArrayBuffer oldChars;
 106
 107     /**
 108      * Array used when extracting strings from content provider
 109      */
 110     private CharArrayBuffer mNewChars;
 111
 112     /* ------------ Inner Classes ------------ */
 113
 114     /**
 115      * Receives notifications when the data in the content provider changes
 116      */
 117     private class DownloadManagerContentObserver extends ContentObserver {
 118
 119         public DownloadManagerContentObserver() {
 120             super(new Handler());
 121         }
 122
 123         /**
 124          * Receives notification when the data in the observed content
 125          * provider changes.
 126          */
 127         public void onChange(final boolean selfChange) {
 128             if (Constants.LOGVV) {
 129                 Log.v(Constants.TAG, "Service ContentObserver received notification");
 130             }
 131             updateFromProvider();
 132         }
 133
 134     }
 135
 136     /**
 137      * Gets called back when the connection to the media
 138      * scanner is established or lost.
 139      */
 140     public class MediaScannerConnection implements ServiceConnection {
 141         public void onServiceConnected(ComponentName className, IBinder service) {
 142             if (Constants.LOGVV) {
 143                 Log.v(Constants.TAG, "Connected to Media Scanner");
 144             }
 145             mMediaScannerConnecting = false;
 146             synchronized (DownloadService.this) {
 147                 mMediaScannerService = IMediaScannerService.Stub.asInterface(service);
 148                 if (mMediaScannerService != null) {
 149                     updateFromProvider();
 150                 }
 151             }
 152         }
 153
 154         public void disconnectMediaScanner() {
 155             synchronized (DownloadService.this) {
 156                 if (mMediaScannerService != null) {
 157                     mMediaScannerService = null;
 158                     if (Constants.LOGVV) {
 159                         Log.v(Constants.TAG, "Disconnecting from Media Scanner");
 160                     }
 161                     try {
 162                         unbindService(this);
 163                     } catch (IllegalArgumentException ex) {
 164                         if (Constants.LOGV) {
 165                             Log.v(Constants.TAG, "unbindService threw up: " + ex);
 166                         }
 167                     }
 168                 }
 169             }
 170         }
 171
 172         public void onServiceDisconnected(ComponentName className) {
 173             if (Constants.LOGVV) {
 174                 Log.v(Constants.TAG, "Disconnected from Media Scanner");
 175             }
 176             synchronized (DownloadService.this) {
 177                 mMediaScannerService = null;
 178             }
 179         }
 180     }
 181
 182     /* ------------ Methods ------------ */
 183
 184     /**
 185      * Returns an IBinder instance when someone wants to connect to this
 186      * service. Binding to this service is not allowed.
 187      *
 188      * @throws UnsupportedOperationException
 189      */
 190     public IBinder onBind(Intent i) {
 191         throw new UnsupportedOperationException("Cannot bind to Download Manager Service");
 192     }
 193
 194     /**
 195      * Initializes the service when it is first created
 196      */
 197     public void onCreate() {
 198         super.onCreate();
 199         if (Constants.LOGVV) {
 200             Log.v(Constants.TAG, "Service onCreate");
 201         }
 202
 203         mDownloads = Lists.newArrayList();
 204
 205         mObserver = new DownloadManagerContentObserver();
 206         getContentResolver().registerContentObserver(Downloads.CONTENT_URI,
 207                 true, mObserver);
 208
 209         mMediaScannerService = null;
 210         mMediaScannerConnecting = false;
 211         mMediaScannerConnection = new MediaScannerConnection();
 212
 213         mNotifier = new DownloadNotification(this);
 214         mNotifier.mNotificationMgr.cancelAll();
 215         mNotifier.updateNotification();
 216
 217         trimDatabase();
 218         removeSpuriousFiles();
 219         updateFromProvider();
 220     }
 221
 222     /**
 223      * Responds to a call to startService
 224      */
 225     public void onStart(Intent intent, int startId) {
 226         super.onStart(intent, startId);
 227         if (Constants.LOGVV) {
 228             Log.v(Constants.TAG, "Service onStart");
 229         }
 230
 231         updateFromProvider();
 232     }
 233
 234     /**
 235      * Cleans up when the service is destroyed
 236      */
 237     public void onDestroy() {
 238         getContentResolver().unregisterContentObserver(mObserver);
 239         if (Constants.LOGVV) {
 240             Log.v(Constants.TAG, "Service onDestroy");
 241         }
 242         super.onDestroy();
 243     }
 244
 245     /**
 246      * Parses data from the content provider into private array
 247      */
 248     private void updateFromProvider() {
 249         synchronized (this) {
 250             mPendingUpdate = true;
 251             if (mUpdateThread == null) {
 252                 mUpdateThread = new UpdateThread();
 253                 mUpdateThread.start();
 254             }
 255         }
 256     }
 257
 258     private class UpdateThread extends Thread {
 259         public UpdateThread() {
 260             super("Download Service");
 261         }
 262
 263         public void run() {
 264             Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
 265
 266             boolean keepService = false;
 267             // for each update from the database, remember which download is
 268             // supposed to get restarted soonest in the future
 269             long wakeUp = Long.MAX_VALUE;
 270             for (;;) {
 271                 synchronized (DownloadService.this) {
 272                     if (mUpdateThread != this) {
 273                         throw new IllegalStateException(
 274                                 "multiple UpdateThreads in DownloadService");
 275                     }
 276                     if (!mPendingUpdate) {
 277                         mUpdateThread = null;
 278                         if (!keepService) {
 279                             stopSelf();
 280                         }
 281                         if (wakeUp != Long.MAX_VALUE) {
 282                             AlarmManager alarms =
 283                                     (AlarmManager) getSystemService(Context.ALARM_SERVICE);
 284                             if (alarms == null) {
 285                                 Log.e(Constants.TAG, "couldn't get alarm manager");
 286                             } else {
 287                                 if (Constants.LOGV) {
 288                                     Log.v(Constants.TAG, "scheduling retry in " + wakeUp + "ms");
 289                                 }
 290                                 Intent intent = new Intent(Constants.ACTION_RETRY);
 291                                 intent.setClassName("com.android.providers.downloads",
 292                                         DownloadReceiver.class.getName());
 293                                 alarms.set(
 294                                         AlarmManager.RTC_WAKEUP,
 295                                         System.currentTimeMillis() + wakeUp,
 296                                         PendingIntent.getBroadcast(DownloadService.this, 0, intent,
 297                                                 PendingIntent.FLAG_ONE_SHOT));
 298                             }
 299                         }
 300                         oldChars = null;
 301                         mNewChars = null;
 302                         return;
 303                     }
 304                     mPendingUpdate = false;
 305                 }
 306                 boolean networkAvailable = Helpers.isNetworkAvailable(DownloadService.this);
 307                 boolean networkRoaming = Helpers.isNetworkRoaming(DownloadService.this);
 308                 long now = System.currentTimeMillis();
 309
 310                 Cursor cursor = getContentResolver().query(Downloads.CONTENT_URI,
 311                         null, null, null, Downloads._ID);
 312
 313                 if (cursor == null) {
 314                     return;
 315                 }
 316
 317                 cursor.moveToFirst();
 318
 319                 int arrayPos = 0;
 320
 321                 boolean mustScan = false;
 322                 keepService = false;
 323                 wakeUp = Long.MAX_VALUE;
 324
 325                 boolean isAfterLast = cursor.isAfterLast();
 326
 327                 int idColumn = cursor.getColumnIndexOrThrow(Downloads._ID);
 328
 329                 /*
 330                  * Walk the cursor and the local array to keep them in sync. The key
 331                  *     to the algorithm is that the ids are unique and sorted both in
 332                  *     the cursor and in the array, so that they can be processed in
 333                  *     order in both sources at the same time: at each step, both
 334                  *     sources point to the lowest id that hasn't been processed from
 335                  *     that source, and the algorithm processes the lowest id from
 336                  *     those two possibilities.
 337                  * At each step:
 338                  * -If the array contains an entry that's not in the cursor, remove the
 339                  *     entry, move to next entry in the array.
 340                  * -If the array contains an entry that's in the cursor, nothing to do,
 341                  *     move to next cursor row and next array entry.
 342                  * -If the cursor contains an entry that's not in the array, insert
 343                  *     a new entry in the array, move to next cursor row and next
 344                  *     array entry.
 345                  */
 346                 while (!isAfterLast || arrayPos < mDownloads.size()) {
 347                     if (isAfterLast) {
 348                         // We're beyond the end of the cursor but there's still some
 349                         //     stuff in the local array, which can only be junk
 350                         if (Constants.LOGVV) {
 351                             int arrayId = ((DownloadInfo) mDownloads.get(arrayPos)).mId;
 352                             Log.v(Constants.TAG, "Array update: trimming " +
 353                                     arrayId + " @ "  + arrayPos);
 354                         }
 355                         if (shouldScanFile(arrayPos) && mediaScannerConnected()) {
 356                             scanFile(null, arrayPos);
 357                         }
 358                         deleteDownload(arrayPos); // this advances in the array
 359                     } else {
 360                         int id = cursor.getInt(idColumn);
 361
 362                         if (arrayPos == mDownloads.size()) {
 363                             insertDownload(cursor, arrayPos, networkAvailable, networkRoaming, now);
 364                             if (Constants.LOGVV) {
 365                                 Log.v(Constants.TAG, "Array update: inserting " +
 366                                         id + " @ " + arrayPos);
 367                             }
 368                             if (shouldScanFile(arrayPos)
 369                                     && (!mediaScannerConnected() || !scanFile(cursor, arrayPos))) {
 370                                 mustScan = true;
 371                                 keepService = true;
 372                             }
 373                             if (visibleNotification(arrayPos)) {
 374                                 keepService = true;
 375                             }
 376                             long next = nextAction(arrayPos, now);
 377                             if (next == 0) {
 378                                 keepService = true;
 379                             } else if (next > 0 && next < wakeUp) {
 380                                 wakeUp = next;
 381                             }
 382                             ++arrayPos;
 383                             cursor.moveToNext();
 384                             isAfterLast = cursor.isAfterLast();
 385                         } else {
 386                             int arrayId = mDownloads.get(arrayPos).mId;
 387
 388                             if (arrayId < id) {
 389                                 // The array entry isn't in the cursor
 390                                 if (Constants.LOGVV) {
 391                                     Log.v(Constants.TAG, "Array update: removing " + arrayId
 392                                             + " @ " + arrayPos);
 393                                 }
 394                                 if (shouldScanFile(arrayPos) && mediaScannerConnected()) {
 395                                     scanFile(null, arrayPos);
 396                                 }
 397                                 deleteDownload(arrayPos); // this advances in the array
 398                             } else if (arrayId == id) {
 399                                 // This cursor row already exists in the stored array
 400                                 updateDownload(
 401                                         cursor, arrayPos,
 402                                         networkAvailable, networkRoaming, now);
 403                                 if (shouldScanFile(arrayPos)
 404                                         && (!mediaScannerConnected()
 405                                                 || !scanFile(cursor, arrayPos))) {
 406                                     mustScan = true;
 407                                     keepService = true;
 408                                 }
 409                                 if (visibleNotification(arrayPos)) {
 410                                     keepService = true;
 411                                 }
 412                                 long next = nextAction(arrayPos, now);
 413                                 if (next == 0) {
 414                                     keepService = true;
 415                                 } else if (next > 0 && next < wakeUp) {
 416                                     wakeUp = next;
 417                                 }
 418                                 ++arrayPos;
 419                                 cursor.moveToNext();
 420                                 isAfterLast = cursor.isAfterLast();
 421                             } else {
 422                                 // This cursor entry didn't exist in the stored array
 423                                 if (Constants.LOGVV) {
 424                                     Log.v(Constants.TAG, "Array update: appending " +
 425                                             id + " @ " + arrayPos);
 426                                 }
 427                                 insertDownload(
 428                                         cursor, arrayPos,
 429                                         networkAvailable, networkRoaming, now);
 430                                 if (shouldScanFile(arrayPos)
 431                                         && (!mediaScannerConnected()
 432                                                 || !scanFile(cursor, arrayPos))) {
 433                                     mustScan = true;
 434                                     keepService = true;
 435                                 }
 436                                 if (visibleNotification(arrayPos)) {
 437                                     keepService = true;
 438                                 }
 439                                 long next = nextAction(arrayPos, now);
 440                                 if (next == 0) {
 441                                     keepService = true;
 442                                 } else if (next > 0 && next < wakeUp) {
 443                                     wakeUp = next;
 444                                 }
 445                                 ++arrayPos;
 446                                 cursor.moveToNext();
 447                                 isAfterLast = cursor.isAfterLast();
 448                             }
 449                         }
 450                     }
 451                 }
 452
 453                 mNotifier.updateNotification();
 454
 455                 if (mustScan) {
 456                     if (!mMediaScannerConnecting) {
 457                         Intent intent = new Intent();
 458                         intent.setClassName("com.android.providers.media",
 459                                 "com.android.providers.media.MediaScannerService");
 460                         mMediaScannerConnecting = true;
 461                         bindService(intent, mMediaScannerConnection, BIND_AUTO_CREATE);
 462                     }
 463                 } else {
 464                     mMediaScannerConnection.disconnectMediaScanner();
 465                 }
 466
 467                 cursor.close();
 468             }
 469         }
 470     }
 471
 472     /**
 473      * Removes files that may have been left behind in the cache directory
 474      */
 475     private void removeSpuriousFiles() {
 476         File[] files = Environment.getDownloadCacheDirectory().listFiles();
 477         if (files == null) {
 478             // The cache folder doesn't appear to exist (this is likely the case
 479             // when running the simulator).
 480             return;
 481         }
 482         HashSet<String> fileSet = new HashSet();
 483         for (int i = 0; i < files.length; i++) {
 484             if (files[i].getName().equals(Constants.KNOWN_SPURIOUS_FILENAME)) {
 485                 continue;
 486             }
 487             if (files[i].getName().equalsIgnoreCase(Constants.RECOVERY_DIRECTORY)) {
 488                 continue;
 489             }
 490             fileSet.add(files[i].getPath());
 491         }
 492
 493         Cursor cursor = getContentResolver().query(Downloads.CONTENT_URI,
 494                 new String[] { Downloads._DATA }, null, null, null);
 495         if (cursor != null) {
 496             if (cursor.moveToFirst()) {
 497                 do {
 498                     fileSet.remove(cursor.getString(0));
 499                 } while (cursor.moveToNext());
 500             }
 501             cursor.close();
 502         }
 503         Iterator<String> iterator = fileSet.iterator();
 504         while (iterator.hasNext()) {
 505             String filename = iterator.next();
 506             if (Constants.LOGV) {
 507                 Log.v(Constants.TAG, "deleting spurious file " + filename);
 508             }
 509             new File(filename).delete();
 510         }
 511     }
 512
 513     /**
 514      * Drops old rows from the database to prevent it from growing too large
 515      */
 516     private void trimDatabase() {
 517         Cursor cursor = getContentResolver().query(Downloads.CONTENT_URI,
 518                 new String[] { Downloads._ID },
 519                 Downloads.COLUMN_STATUS + " >= '200'", null,
 520                 Downloads.COLUMN_LAST_MODIFICATION);
 521         if (cursor == null) {
 522             // This isn't good - if we can't do basic queries in our database, nothing's gonna work
 523             Log.e(Constants.TAG, "null cursor in trimDatabase");
 524             return;
 525         }
 526         if (cursor.moveToFirst()) {
 527             int numDelete = cursor.getCount() - Constants.MAX_DOWNLOADS;
 528             int columnId = cursor.getColumnIndexOrThrow(Downloads._ID);
 529             while (numDelete > 0) {
 530                 getContentResolver().delete(
 531                         ContentUris.withAppendedId(Downloads.CONTENT_URI, cursor.getLong(columnId)),
 532                         null, null);
 533                 if (!cursor.moveToNext()) {
 534                     break;
 535                 }
 536                 numDelete--;
 537             }
 538         }
 539         cursor.close();
 540     }
 541
 542     /**
 543      * Keeps a local copy of the info about a download, and initiates the
 544      * download if appropriate.
 545      */
 546     private void insertDownload(
 547             Cursor cursor, int arrayPos,
 548             boolean networkAvailable, boolean networkRoaming, long now) {
 549         int statusColumn = cursor.getColumnIndexOrThrow(Downloads.COLUMN_STATUS);
 550         int failedColumn = cursor.getColumnIndexOrThrow(Constants.FAILED_CONNECTIONS);
 551         int retryRedirect =
 552                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.RETRY_AFTER_X_REDIRECT_COUNT));
 553         DownloadInfo info = new DownloadInfo(
 554                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads._ID)),
 555                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_URI)),
 556                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_NO_INTEGRITY)) == 1,
 557                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_FILE_NAME_HINT)),
 558                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads._DATA)),
 559                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_MIME_TYPE)),
 560                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_DESTINATION)),
 561                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_VISIBILITY)),
 562                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_CONTROL)),
 563                 cursor.getInt(statusColumn),
 564                 cursor.getInt(failedColumn),
 565                 retryRedirect & 0xfffffff,
 566                 retryRedirect >> 28,
 567                 cursor.getLong(cursor.getColumnIndexOrThrow(Downloads.COLUMN_LAST_MODIFICATION)),
 568                 cursor.getString(cursor.getColumnIndexOrThrow(
 569                         Downloads.COLUMN_NOTIFICATION_PACKAGE)),
 570                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_NOTIFICATION_CLASS)),
 571                 cursor.getString(cursor.getColumnIndexOrThrow(
 572                         Downloads.COLUMN_NOTIFICATION_EXTRAS)),
 573                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_COOKIE_DATA)),
 574                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_USER_AGENT)),
 575                 cursor.getString(cursor.getColumnIndexOrThrow(Downloads.COLUMN_REFERER)),
 576                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_TOTAL_BYTES)),
 577                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_CURRENT_BYTES)),
 578                 cursor.getString(cursor.getColumnIndexOrThrow(Constants.ETAG)),
 579                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.MEDIA_SCANNED)) == 1);
 580
 581         if (Constants.LOGVV) {
 582             Log.v(Constants.TAG, "Service adding new entry");
 583             Log.v(Constants.TAG, "ID      : " + info.mId);
 584             Log.v(Constants.TAG, "URI     : " + ((info.mUri != null) ? "yes" : "no"));
 585             Log.v(Constants.TAG, "NO_INTEG: " + info.mNoIntegrity);
 586             Log.v(Constants.TAG, "HINT    : " + info.mHint);
 587             Log.v(Constants.TAG, "FILENAME: " + info.mFileName);
 588             Log.v(Constants.TAG, "MIMETYPE: " + info.mMimeType);
 589             Log.v(Constants.TAG, "DESTINAT: " + info.mDestination);
 590             Log.v(Constants.TAG, "VISIBILI: " + info.mVisibility);
 591             Log.v(Constants.TAG, "CONTROL : " + info.mControl);
 592             Log.v(Constants.TAG, "STATUS  : " + info.mStatus);
 593             Log.v(Constants.TAG, "FAILED_C: " + info.mNumFailed);
 594             Log.v(Constants.TAG, "RETRY_AF: " + info.mRetryAfter);
 595             Log.v(Constants.TAG, "REDIRECT: " + info.mRedirectCount);
 596             Log.v(Constants.TAG, "LAST_MOD: " + info.mLastMod);
 597             Log.v(Constants.TAG, "PACKAGE : " + info.mPackage);
 598             Log.v(Constants.TAG, "CLASS   : " + info.mClass);
 599             Log.v(Constants.TAG, "COOKIES : " + ((info.mCookies != null) ? "yes" : "no"));
 600             Log.v(Constants.TAG, "AGENT   : " + info.mUserAgent);
 601             Log.v(Constants.TAG, "REFERER : " + ((info.mReferer != null) ? "yes" : "no"));
 602             Log.v(Constants.TAG, "TOTAL   : " + info.mTotalBytes);
 603             Log.v(Constants.TAG, "CURRENT : " + info.mCurrentBytes);
 604             Log.v(Constants.TAG, "ETAG    : " + info.mETag);
 605             Log.v(Constants.TAG, "SCANNED : " + info.mMediaScanned);
 606         }
 607
 608         mDownloads.add(arrayPos, info);
 609
 610         if (info.mStatus == 0
 611                 && (info.mDestination == Downloads.DESTINATION_EXTERNAL
 612                     || info.mDestination == Downloads.DESTINATION_CACHE_PARTITION_PURGEABLE)
 613                 && info.mMimeType != null
 614                 && !DrmRawContent.DRM_MIMETYPE_MESSAGE_STRING.equalsIgnoreCase(info.mMimeType)) {
 615             // Check to see if we are allowed to download this file. Only files
 616             // that can be handled by the platform can be downloaded.
 617             // special case DRM files, which we should always allow downloading.
 618             Intent mimetypeIntent = new Intent(Intent.ACTION_VIEW);
 619
 620             // We can provide data as either content: or file: URIs,
 621             // so allow both.  (I think it would be nice if we just did
 622             // everything as content: URIs)
 623             // Actually, right now the download manager's UId restrictions
 624             // prevent use from using content: so it's got to be file: or
 625             // nothing
 626
 627             mimetypeIntent.setDataAndType(Uri.fromParts("file", "", null), info.mMimeType);
 628             ResolveInfo ri = getPackageManager().resolveActivity(mimetypeIntent,
 629                     PackageManager.MATCH_DEFAULT_ONLY);
 630             //Log.i(Constants.TAG, "*** QUERY " + mimetypeIntent + ": " + list);
 631
 632             if (ri == null) {
 633                 if (Config.LOGD) {
 634                     Log.d(Constants.TAG, "no application to handle MIME type " + info.mMimeType);
 635                 }
 636                 info.mStatus = Downloads.STATUS_NOT_ACCEPTABLE;
 637
 638                 Uri uri = ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId);
 639                 ContentValues values = new ContentValues();
 640                 values.put(Downloads.COLUMN_STATUS, Downloads.STATUS_NOT_ACCEPTABLE);
 641                 getContentResolver().update(uri, values, null, null);
 642                 info.sendIntentIfRequested(uri, this);
 643                 return;
 644             }
 645         }
 646
 647         if (info.canUseNetwork(networkAvailable, networkRoaming)) {
 648             if (info.isReadyToStart(now)) {
 649                 if (Constants.LOGV) {
 650                     Log.v(Constants.TAG, "Service spawning thread to handle new download " +
 651                             info.mId);
 652                 }
 653                 if (info.mHasActiveThread) {
 654                     throw new IllegalStateException("Multiple threads on same download on insert");
 655                 }
 656                 if (info.mStatus != Downloads.STATUS_RUNNING) {
 657                     info.mStatus = Downloads.STATUS_RUNNING;
 658                     ContentValues values = new ContentValues();
 659                     values.put(Downloads.COLUMN_STATUS, info.mStatus);
 660                     getContentResolver().update(
 661                             ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId),
 662                             values, null, null);
 663                 }
 664                 DownloadThread downloader = new DownloadThread(this, info);
 665                 info.mHasActiveThread = true;
 666                 downloader.start();
 667             }
 668         } else {
 669             if (info.mStatus == 0
 670                     || info.mStatus == Downloads.STATUS_PENDING
 671                     || info.mStatus == Downloads.STATUS_RUNNING) {
 672                 info.mStatus = Downloads.STATUS_RUNNING_PAUSED;
 673                 Uri uri = ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId);
 674                 ContentValues values = new ContentValues();
 675                 values.put(Downloads.COLUMN_STATUS, Downloads.STATUS_RUNNING_PAUSED);
 676                 getContentResolver().update(uri, values, null, null);
 677             }
 678         }
 679     }
 680
 681     /**
 682      * Updates the local copy of the info about a download.
 683      */
 684     private void updateDownload(
 685             Cursor cursor, int arrayPos,
 686             boolean networkAvailable, boolean networkRoaming, long now) {
 687         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 688         int statusColumn = cursor.getColumnIndexOrThrow(Downloads.COLUMN_STATUS);
 689         int failedColumn = cursor.getColumnIndexOrThrow(Constants.FAILED_CONNECTIONS);
 690         info.mId = cursor.getInt(cursor.getColumnIndexOrThrow(Downloads._ID));
 691         info.mUri = stringFromCursor(info.mUri, cursor, Downloads.COLUMN_URI);
 692         info.mNoIntegrity =
 693                 cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_NO_INTEGRITY)) == 1;
 694         info.mHint = stringFromCursor(info.mHint, cursor, Downloads.COLUMN_FILE_NAME_HINT);
 695         info.mFileName = stringFromCursor(info.mFileName, cursor, Downloads._DATA);
 696         info.mMimeType = stringFromCursor(info.mMimeType, cursor, Downloads.COLUMN_MIME_TYPE);
 697         info.mDestination = cursor.getInt(cursor.getColumnIndexOrThrow(
 698                 Downloads.COLUMN_DESTINATION));
 699         int newVisibility = cursor.getInt(cursor.getColumnIndexOrThrow(
 700                 Downloads.COLUMN_VISIBILITY));
 701         if (info.mVisibility == Downloads.VISIBILITY_VISIBLE_NOTIFY_COMPLETED
 702                 && newVisibility != Downloads.VISIBILITY_VISIBLE_NOTIFY_COMPLETED
 703                 && Downloads.isStatusCompleted(info.mStatus)) {
 704             mNotifier.mNotificationMgr.cancel(info.mId);
 705         }
 706         info.mVisibility = newVisibility;
 707         synchronized (info) {
 708             info.mControl = cursor.getInt(cursor.getColumnIndexOrThrow(Downloads.COLUMN_CONTROL));
 709         }
 710         int newStatus = cursor.getInt(statusColumn);
 711         if (!Downloads.isStatusCompleted(info.mStatus) && Downloads.isStatusCompleted(newStatus)) {
 712             mNotifier.mNotificationMgr.cancel(info.mId);
 713         }
 714         info.mStatus = newStatus;
 715         info.mNumFailed = cursor.getInt(failedColumn);
 716         int retryRedirect =
 717                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.RETRY_AFTER_X_REDIRECT_COUNT));
 718         info.mRetryAfter = retryRedirect & 0xfffffff;
 719         info.mRedirectCount = retryRedirect >> 28;
 720         info.mLastMod = cursor.getLong(cursor.getColumnIndexOrThrow(
 721                 Downloads.COLUMN_LAST_MODIFICATION));
 722         info.mPackage = stringFromCursor(
 723                 info.mPackage, cursor, Downloads.COLUMN_NOTIFICATION_PACKAGE);
 724         info.mClass = stringFromCursor(info.mClass, cursor, Downloads.COLUMN_NOTIFICATION_CLASS);
 725         info.mCookies = stringFromCursor(info.mCookies, cursor, Downloads.COLUMN_COOKIE_DATA);
 726         info.mUserAgent = stringFromCursor(info.mUserAgent, cursor, Downloads.COLUMN_USER_AGENT);
 727         info.mReferer = stringFromCursor(info.mReferer, cursor, Downloads.COLUMN_REFERER);
 728         info.mTotalBytes = cursor.getInt(cursor.getColumnIndexOrThrow(
 729                 Downloads.COLUMN_TOTAL_BYTES));
 730         info.mCurrentBytes = cursor.getInt(cursor.getColumnIndexOrThrow(
 731                 Downloads.COLUMN_CURRENT_BYTES));
 732         info.mETag = stringFromCursor(info.mETag, cursor, Constants.ETAG);
 733         info.mMediaScanned =
 734                 cursor.getInt(cursor.getColumnIndexOrThrow(Constants.MEDIA_SCANNED)) == 1;
 735
 736         if (info.canUseNetwork(networkAvailable, networkRoaming)) {
 737             if (info.isReadyToRestart(now)) {
 738                 if (Constants.LOGV) {
 739                     Log.v(Constants.TAG, "Service spawning thread to handle updated download " +
 740                             info.mId);
 741                 }
 742                 if (info.mHasActiveThread) {
 743                     throw new IllegalStateException("Multiple threads on same download on update");
 744                 }
 745                 info.mStatus = Downloads.STATUS_RUNNING;
 746                 ContentValues values = new ContentValues();
 747                 values.put(Downloads.COLUMN_STATUS, info.mStatus);
 748                 getContentResolver().update(
 749                         ContentUris.withAppendedId(Downloads.CONTENT_URI, info.mId),
 750                         values, null, null);
 751                 DownloadThread downloader = new DownloadThread(this, info);
 752                 info.mHasActiveThread = true;
 753                 downloader.start();
 754             }
 755         }
 756     }
 757
 758     /**
 759      * Returns a String that holds the current value of the column,
 760      * optimizing for the case where the value hasn't changed.
 761      */
 762     private String stringFromCursor(String old, Cursor cursor, String column) {
 763         int index = cursor.getColumnIndexOrThrow(column);
 764         if (old == null) {
 765             return cursor.getString(index);
 766         }
 767         if (mNewChars == null) {
 768             mNewChars = new CharArrayBuffer(128);
 769         }
 770         cursor.copyStringToBuffer(index, mNewChars);
 771         int length = mNewChars.sizeCopied;
 772         if (length != old.length()) {
 773             return cursor.getString(index);
 774         }
 775         if (oldChars == null || oldChars.sizeCopied < length) {
 776             oldChars = new CharArrayBuffer(length);
 777         }
 778         char[] oldArray = oldChars.data;
 779         char[] newArray = mNewChars.data;
 780         old.getChars(0, length, oldArray, 0);
 781         for (int i = length - 1; i >= 0; --i) {
 782             if (oldArray[i] != newArray[i]) {
 783                 return new String(newArray, 0, length);
 784             }
 785         }
 786         return old;
 787     }
 788
 789     /**
 790      * Removes the local copy of the info about a download.
 791      */
 792     private void deleteDownload(int arrayPos) {
 793         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 794         if (info.mStatus == Downloads.STATUS_RUNNING) {
 795             info.mStatus = Downloads.STATUS_CANCELED;
 796         } else if (info.mDestination != Downloads.DESTINATION_EXTERNAL && info.mFileName != null) {
 797             new File(info.mFileName).delete();
 798         }
 799         mNotifier.mNotificationMgr.cancel(info.mId);
 800
 801         mDownloads.remove(arrayPos);
 802     }
 803
 804     /**
 805      * Returns the amount of time (as measured from the "now" parameter)
 806      * at which a download will be active.
 807      * 0 = immediately - service should stick around to handle this download.
 808      * -1 = never - service can go away without ever waking up.
 809      * positive value - service must wake up in the future, as specified in ms from "now"
 810      */
 811     private long nextAction(int arrayPos, long now) {
 812         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 813         if (Downloads.isStatusCompleted(info.mStatus)) {
 814             return -1;
 815         }
 816         if (info.mStatus != Downloads.STATUS_RUNNING_PAUSED) {
 817             return 0;
 818         }
 819         if (info.mNumFailed == 0) {
 820             return 0;
 821         }
 822         long when = info.restartTime();
 823         if (when <= now) {
 824             return 0;
 825         }
 826         return when - now;
 827     }
 828
 829     /**
 830      * Returns whether there's a visible notification for this download
 831      */
 832     private boolean visibleNotification(int arrayPos) {
 833         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 834         return info.hasCompletionNotification();
 835     }
 836
 837     /**
 838      * Returns whether a file should be scanned
 839      */
 840     private boolean shouldScanFile(int arrayPos) {
 841         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 842         return !info.mMediaScanned
 843                 && info.mDestination == Downloads.DESTINATION_EXTERNAL
 844                 && Downloads.isStatusSuccess(info.mStatus)
 845                 && !DrmRawContent.DRM_MIMETYPE_MESSAGE_STRING.equalsIgnoreCase(info.mMimeType);
 846     }
 847
 848     /**
 849      * Returns whether we have a live connection to the Media Scanner
 850      */
 851     private boolean mediaScannerConnected() {
 852         return mMediaScannerService != null;
 853     }
 854
 855     /**
 856      * Attempts to scan the file if necessary.
 857      * Returns true if the file has been properly scanned.
 858      */
 859     private boolean scanFile(Cursor cursor, int arrayPos) {
 860         DownloadInfo info = (DownloadInfo) mDownloads.get(arrayPos);
 861         synchronized (this) {
 862             if (mMediaScannerService != null) {
 863                 try {
 864                     if (Constants.LOGV) {
 865                         Log.v(Constants.TAG, "Scanning file " + info.mFileName);
 866                     }
 867                     mMediaScannerService.scanFile(info.mFileName, info.mMimeType);
 868                     if (cursor != null) {
 869                         ContentValues values = new ContentValues();
 870                         values.put(Constants.MEDIA_SCANNED, 1);
 871                         getContentResolver().update(
 872                                 ContentUris.withAppendedId(Downloads.CONTENT_URI,
 873                                        cursor.getLong(cursor.getColumnIndexOrThrow(Downloads._ID))),
 874                                 values, null, null);
 875                     }
 876                     return true;
 877                 } catch (RemoteException e) {
 878                     if (Config.LOGD) {
 879                         Log.d(Constants.TAG, "Failed to scan file " + info.mFileName);
 880                     }
 881                 }
 882             }
 883         }
 884         return false;
 885     }
 886
 887 }