1 /* 2 * Copyright (C) 2012 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 static android.app.DownloadManager.COLUMN_LOCAL_FILENAME; 20 import static android.app.DownloadManager.COLUMN_MEDIA_TYPE; 21 import static android.app.DownloadManager.COLUMN_URI; 22 import static android.provider.Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI; 23 24 import static com.android.providers.downloads.Constants.TAG; 25 26 import android.app.DownloadManager; 27 import android.content.ActivityNotFoundException; 28 import android.content.ContentUris; 29 import android.content.Context; 30 import android.content.Intent; 31 import android.content.pm.PackageInstaller; 32 import android.database.Cursor; 33 import android.net.Uri; 34 import android.os.Process; 35 import android.provider.DocumentsContract; 36 import android.provider.Downloads.Impl.RequestHeaders; 37 import android.util.Log; 38 39 import java.io.File; 40 41 public class OpenHelper { 42 /** 43 * Build and start an {@link Intent} to view the download with given ID, 44 * handling subtleties around installing packages. 45 */ startViewIntent(Context context, long id, int intentFlags)46 public static boolean startViewIntent(Context context, long id, int intentFlags) { 47 final Intent intent = OpenHelper.buildViewIntent(context, id); 48 if (intent == null) { 49 Log.w(TAG, "No intent built for " + id); 50 return false; 51 } 52 53 intent.addFlags(intentFlags); 54 try { 55 context.startActivity(intent); 56 return true; 57 } catch (ActivityNotFoundException e) { 58 Log.w(TAG, "Failed to start " + intent + ": " + e); 59 return false; 60 } 61 } 62 63 /** 64 * Build an {@link Intent} to view the download with given ID, handling 65 * subtleties around installing packages. 66 */ buildViewIntent(Context context, long id)67 private static Intent buildViewIntent(Context context, long id) { 68 final DownloadManager downManager = (DownloadManager) context.getSystemService( 69 Context.DOWNLOAD_SERVICE); 70 downManager.setAccessAllDownloads(true); 71 downManager.setAccessFilename(true); 72 73 final Cursor cursor = downManager.query(new DownloadManager.Query().setFilterById(id)); 74 try { 75 if (!cursor.moveToFirst()) { 76 return null; 77 } 78 79 final File file = getCursorFile(cursor, COLUMN_LOCAL_FILENAME); 80 String mimeType = getCursorString(cursor, COLUMN_MEDIA_TYPE); 81 mimeType = DownloadDrmHelper.getOriginalMimeType(context, file, mimeType); 82 83 final Uri documentUri = DocumentsContract.buildDocumentUri( 84 Constants.STORAGE_AUTHORITY, String.valueOf(id)); 85 86 final Intent intent = new Intent(Intent.ACTION_VIEW); 87 intent.setDataAndType(documentUri, mimeType); 88 intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION 89 | Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 90 91 if ("application/vnd.android.package-archive".equals(mimeType)) { 92 // Also splice in details about where it came from 93 final Uri remoteUri = getCursorUri(cursor, COLUMN_URI); 94 intent.putExtra(Intent.EXTRA_ORIGINATING_URI, remoteUri); 95 intent.putExtra(Intent.EXTRA_REFERRER, getRefererUri(context, id)); 96 intent.putExtra(Intent.EXTRA_ORIGINATING_UID, getOriginatingUid(context, id)); 97 } 98 99 return intent; 100 } finally { 101 cursor.close(); 102 } 103 } 104 getRefererUri(Context context, long id)105 private static Uri getRefererUri(Context context, long id) { 106 final Uri headersUri = Uri.withAppendedPath( 107 ContentUris.withAppendedId(ALL_DOWNLOADS_CONTENT_URI, id), 108 RequestHeaders.URI_SEGMENT); 109 final Cursor headers = context.getContentResolver() 110 .query(headersUri, null, null, null, null); 111 try { 112 while (headers.moveToNext()) { 113 final String header = getCursorString(headers, RequestHeaders.COLUMN_HEADER); 114 if ("Referer".equalsIgnoreCase(header)) { 115 return getCursorUri(headers, RequestHeaders.COLUMN_VALUE); 116 } 117 } 118 } finally { 119 headers.close(); 120 } 121 return null; 122 } 123 getOriginatingUid(Context context, long id)124 private static int getOriginatingUid(Context context, long id) { 125 final Uri uri = ContentUris.withAppendedId(ALL_DOWNLOADS_CONTENT_URI, id); 126 final Cursor cursor = context.getContentResolver().query(uri, new String[]{Constants.UID}, 127 null, null, null); 128 if (cursor != null) { 129 try { 130 if (cursor.moveToFirst()) { 131 final int uid = cursor.getInt(cursor.getColumnIndexOrThrow(Constants.UID)); 132 if (uid != Process.myUid()) { 133 return uid; 134 } 135 } 136 } finally { 137 cursor.close(); 138 } 139 } 140 return PackageInstaller.SessionParams.UID_UNKNOWN; 141 } 142 getCursorString(Cursor cursor, String column)143 private static String getCursorString(Cursor cursor, String column) { 144 return cursor.getString(cursor.getColumnIndexOrThrow(column)); 145 } 146 getCursorUri(Cursor cursor, String column)147 private static Uri getCursorUri(Cursor cursor, String column) { 148 return Uri.parse(getCursorString(cursor, column)); 149 } 150 getCursorFile(Cursor cursor, String column)151 private static File getCursorFile(Cursor cursor, String column) { 152 return new File(cursor.getString(cursor.getColumnIndexOrThrow(column))); 153 } 154 } 155