| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.traceur; |
| |
| import android.annotation.SuppressLint; |
| import android.database.Cursor; |
| import android.database.MatrixCursor; |
| import android.net.Uri; |
| import android.os.Bundle; |
| import android.os.FileUtils; |
| import android.os.CancellationSignal; |
| import android.os.ParcelFileDescriptor; |
| import android.provider.DocumentsContract; |
| import android.provider.DocumentsContract.Document; |
| import android.provider.DocumentsContract.Root; |
| import android.provider.DocumentsProvider; |
| import android.provider.Settings; |
| import android.util.Log; |
| import android.webkit.MimeTypeMap; |
| |
| import com.android.internal.content.FileSystemProvider; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| |
| /** |
| * Adds an entry for traces in the file picker. |
| */ |
| public class StorageProvider extends FileSystemProvider{ |
| |
| public static final String TAG = StorageProvider.class.getName(); |
| public static final String AUTHORITY = "com.android.traceur.documents"; |
| |
| private static final String DOC_ID_ROOT = "traces"; |
| private static final String ROOT_DIR = "/data/local/traces"; |
| private static final String MIME_TYPE = "application/vnd.android.systrace"; |
| |
| private static final String[] DEFAULT_ROOT_PROJECTION = new String[] { |
| Root.COLUMN_ROOT_ID, |
| Root.COLUMN_ICON, |
| Root.COLUMN_TITLE, |
| Root.COLUMN_FLAGS, |
| Root.COLUMN_DOCUMENT_ID, |
| }; |
| |
| private static final String[] DEFAULT_DOCUMENT_PROJECTION = new String[] { |
| Document.COLUMN_DOCUMENT_ID, |
| Document.COLUMN_DISPLAY_NAME, |
| Document.COLUMN_MIME_TYPE, |
| Document.COLUMN_FLAGS, |
| Document.COLUMN_SIZE, |
| Document.COLUMN_LAST_MODIFIED, |
| }; |
| |
| @Override |
| public boolean onCreate() { |
| super.onCreate(DEFAULT_DOCUMENT_PROJECTION); |
| return true; |
| } |
| |
| @Override |
| public Cursor queryRoots(String[] projection) throws FileNotFoundException { |
| final MatrixCursor result = new MatrixCursor(resolveRootProjection(projection)); |
| |
| boolean developerOptionsIsEnabled = |
| Settings.Global.getInt(getContext().getContentResolver(), |
| Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0) != 0; |
| |
| // If developer options is not enabled, return an empty root cursor. |
| // This removes the provider from the list entirely. |
| if (!developerOptionsIsEnabled) { |
| return null; |
| } |
| |
| final MatrixCursor.RowBuilder row = result.newRow(); |
| row.add(Root.COLUMN_ROOT_ID, DOC_ID_ROOT); |
| row.add(Root.COLUMN_FLAGS, Root.FLAG_LOCAL_ONLY); |
| row.add(Root.COLUMN_MIME_TYPES, MIME_TYPE); |
| row.add(Root.COLUMN_ICON, R.drawable.stat_sys_adb_green); |
| row.add(Root.COLUMN_TITLE, |
| getContext().getString(R.string.system_traces_storage_title)); |
| row.add(Root.COLUMN_DOCUMENT_ID, DOC_ID_ROOT); |
| return result; |
| } |
| |
| @Override |
| public Cursor queryDocument(String documentId, String[] projection) |
| throws FileNotFoundException { |
| final MatrixCursor result = new MatrixCursor(resolveDocumentProjection(projection)); |
| final MatrixCursor.RowBuilder row = result.newRow(); |
| File file; |
| String mimeType; |
| |
| if (DOC_ID_ROOT.equals(documentId)) { |
| file = new File(ROOT_DIR); |
| mimeType = Document.MIME_TYPE_DIR; |
| } else { |
| file = getFileForDocId(documentId); |
| mimeType = MIME_TYPE; |
| } |
| |
| row.add(Document.COLUMN_DOCUMENT_ID, documentId); |
| row.add(Document.COLUMN_MIME_TYPE, mimeType); |
| row.add(Document.COLUMN_DISPLAY_NAME, file.getName()); |
| row.add(Document.COLUMN_LAST_MODIFIED, file.lastModified()); |
| row.add(Document.COLUMN_SIZE, file.length()); |
| row.add(Document.COLUMN_FLAGS, Document.FLAG_DIR_PREFERS_LAST_MODIFIED | Document.FLAG_SUPPORTS_DELETE); |
| return result; |
| } |
| |
| @Override |
| public Cursor queryChildDocuments( |
| String parentDocumentId, String[] projection, String sortOrder) |
| throws FileNotFoundException { |
| Cursor result = super.queryChildDocuments(parentDocumentId, projection, sortOrder); |
| |
| Bundle bundle = new Bundle(); |
| bundle.putString(DocumentsContract.EXTRA_INFO, |
| getContext().getResources().getString(R.string.system_trace_sensitive_data)); |
| result.setExtras(bundle); |
| |
| return result; |
| } |
| |
| |
| @Override |
| public ParcelFileDescriptor openDocument( |
| String documentId, String mode, CancellationSignal signal) |
| throws FileNotFoundException, UnsupportedOperationException { |
| if (ParcelFileDescriptor.parseMode(mode) != ParcelFileDescriptor.MODE_READ_ONLY) { |
| throw new UnsupportedOperationException( |
| "Attempt to open read-only file " + documentId + " in mode " + mode); |
| } |
| return ParcelFileDescriptor.open(getFileForDocId(documentId), |
| ParcelFileDescriptor.MODE_READ_ONLY); |
| } |
| |
| private static String[] resolveRootProjection(String[] projection) { |
| return projection != null ? projection : DEFAULT_ROOT_PROJECTION; |
| } |
| |
| private static String[] resolveDocumentProjection(String[] projection) { |
| return projection != null ? projection : DEFAULT_DOCUMENT_PROJECTION; |
| } |
| |
| @Override |
| protected Uri buildNotificationUri(String docId) { |
| return DocumentsContract.buildChildDocumentsUri(AUTHORITY, docId); |
| } |
| |
| @Override |
| protected String getDocIdForFile(File file) { |
| return DOC_ID_ROOT + ":" + file.getName(); |
| } |
| |
| @Override |
| protected File getFileForDocId(String documentId, boolean visible) |
| throws FileNotFoundException { |
| if (DOC_ID_ROOT.equals(documentId)) { |
| return new File(ROOT_DIR); |
| } else { |
| final int splitIndex = documentId.indexOf(':', 1); |
| final String name = documentId.substring(splitIndex + 1); |
| if (splitIndex == -1 || !DOC_ID_ROOT.equals(documentId.substring(0, splitIndex)) || |
| !FileUtils.isValidExtFilename(name)) { |
| throw new FileNotFoundException("Invalid document ID: " + documentId); |
| } |
| final File file = new File(ROOT_DIR, name); |
| if (!file.exists()) { |
| throw new FileNotFoundException("File not found: " + documentId); |
| } |
| return file; |
| } |
| } |
| |
| } |