1 /* 2 * Copyright (C) 2015 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.messaging.datamodel; 18 19 import android.content.ContentResolver; 20 import android.content.Context; 21 import android.database.Cursor; 22 import android.database.MatrixCursor; 23 import android.database.MatrixCursor.RowBuilder; 24 import android.net.Uri; 25 import android.provider.OpenableColumns; 26 import androidx.collection.SimpleArrayMap; 27 import android.text.TextUtils; 28 29 import com.android.messaging.Factory; 30 import com.android.messaging.util.Assert; 31 import com.android.messaging.util.LogUtil; 32 import com.google.common.annotations.VisibleForTesting; 33 34 import java.io.File; 35 import java.io.IOException; 36 import java.util.List; 37 38 /** 39 * A very simple content provider that can serve media files from our cache directory. 40 */ 41 public class MediaScratchFileProvider extends FileProvider { 42 private static final String TAG = LogUtil.BUGLE_TAG; 43 44 private static final SimpleArrayMap<Uri, String> sUriToDisplayNameMap = 45 new SimpleArrayMap<Uri, String>(); 46 47 @VisibleForTesting 48 public static final String AUTHORITY = 49 "com.android.messaging.datamodel.MediaScratchFileProvider"; 50 private static final String MEDIA_SCRATCH_SPACE_DIR = "mediascratchspace"; 51 isMediaScratchSpaceUri(final Uri uri)52 public static boolean isMediaScratchSpaceUri(final Uri uri) { 53 if (uri == null) { 54 return false; 55 } 56 57 final List<String> segments = uri.getPathSegments(); 58 return (TextUtils.equals(uri.getScheme(), ContentResolver.SCHEME_CONTENT) && 59 TextUtils.equals(uri.getAuthority(), AUTHORITY) && 60 segments.size() == 1 && FileProvider.isValidFileId(segments.get(0))); 61 } 62 63 /** 64 * Returns a uri that can be used to access a raw mms file. 65 * 66 * @return the URI for an raw mms file 67 */ buildMediaScratchSpaceUri(final String extension)68 public static Uri buildMediaScratchSpaceUri(final String extension) { 69 final Uri uri = FileProvider.buildFileUri(AUTHORITY, extension); 70 final File file = getFileWithExtension(uri.getPath(), extension); 71 if (!ensureFileExists(file)) { 72 LogUtil.e(TAG, "Failed to create temp file " + file.getAbsolutePath()); 73 } 74 return uri; 75 } 76 getFileFromUri(final Uri uri)77 public static File getFileFromUri(final Uri uri) { 78 Assert.equals(AUTHORITY, uri.getAuthority()); 79 return getFileWithExtension(uri.getPath(), getExtensionFromUri(uri)); 80 } 81 getUriBuilder()82 public static Uri.Builder getUriBuilder() { 83 return (new Uri.Builder()).authority(AUTHORITY).scheme(ContentResolver.SCHEME_CONTENT); 84 } 85 86 @Override getFile(final String path, final String extension)87 File getFile(final String path, final String extension) { 88 return getFileWithExtension(path, extension); 89 } 90 getFileWithExtension(final String path, final String extension)91 private static File getFileWithExtension(final String path, final String extension) { 92 final Context context = Factory.get().getApplicationContext(); 93 final File filePath = new File(getDirectory(context), 94 TextUtils.isEmpty(extension) ? path : path + "." + extension); 95 96 try { 97 if (!filePath.getCanonicalPath() 98 .startsWith(getDirectory(context).getCanonicalPath())) { 99 LogUtil.e(TAG, "getFileWithExtension: path " 100 + filePath.getCanonicalPath() 101 + " does not start with " 102 + getDirectory(context).getCanonicalPath()); 103 return null; 104 } 105 } catch (IOException e) { 106 LogUtil.e(TAG, "getFileWithExtension: getCanonicalPath failed ", e); 107 return null; 108 } 109 return filePath; 110 } 111 getDirectory(final Context context)112 private static File getDirectory(final Context context) { 113 return new File(context.getCacheDir(), MEDIA_SCRATCH_SPACE_DIR); 114 } 115 116 @Override query(final Uri uri, final String[] projection, final String selection, final String[] selectionArgs, final String sortOrder)117 public Cursor query(final Uri uri, final String[] projection, final String selection, 118 final String[] selectionArgs, final String sortOrder) { 119 if (projection != null && projection.length > 0 && 120 TextUtils.equals(projection[0], OpenableColumns.DISPLAY_NAME) && 121 isMediaScratchSpaceUri(uri)) { 122 // Retrieve the display name associated with a temp file. This is used by the Contacts 123 // ImportVCardActivity to retrieve the name of the contact(s) being imported. 124 String displayName; 125 synchronized (sUriToDisplayNameMap) { 126 displayName = sUriToDisplayNameMap.get(uri); 127 } 128 if (!TextUtils.isEmpty(displayName)) { 129 MatrixCursor cursor = 130 new MatrixCursor(new String[] { OpenableColumns.DISPLAY_NAME }); 131 RowBuilder row = cursor.newRow(); 132 row.add(displayName); 133 return cursor; 134 } 135 } 136 return null; 137 } 138 addUriToDisplayNameEntry(final Uri scratchFileUri, final String displayName)139 public static void addUriToDisplayNameEntry(final Uri scratchFileUri, 140 final String displayName) { 141 if (TextUtils.isEmpty(displayName)) { 142 return; 143 } 144 synchronized (sUriToDisplayNameMap) { 145 sUriToDisplayNameMap.put(scratchFileUri, displayName); 146 } 147 } 148 } 149