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.Context; 20 import android.net.Uri; 21 import android.text.TextUtils; 22 23 import com.android.messaging.Factory; 24 import com.android.messaging.util.LogUtil; 25 import com.google.common.annotations.VisibleForTesting; 26 27 import java.io.File; 28 import java.io.IOException; 29 30 /** 31 * A very simple content provider that can serve mms files from our cache directory. 32 */ 33 public class MmsFileProvider extends FileProvider { 34 private static final String TAG = LogUtil.BUGLE_TAG; 35 36 @VisibleForTesting 37 static final String AUTHORITY = "com.android.messaging.datamodel.MmsFileProvider"; 38 private static final String RAW_MMS_DIR = "rawmms"; 39 40 /** 41 * Returns a uri that can be used to access a raw mms file. 42 * 43 * @return the URI for an raw mms file 44 */ buildRawMmsUri()45 public static Uri buildRawMmsUri() { 46 final Uri uri = FileProvider.buildFileUri(AUTHORITY, null); 47 final File file = getFile(uri.getPath()); 48 if (!ensureFileExists(file)) { 49 LogUtil.e(TAG, "Failed to create temp file " + file.getAbsolutePath()); 50 } 51 return uri; 52 } 53 54 @Override getFile(final String path, final String extension)55 File getFile(final String path, final String extension) { 56 return getFile(path); 57 } 58 getFile(final Uri uri)59 public static File getFile(final Uri uri) { 60 return getFile(uri.getPath()); 61 } 62 getFile(final String path)63 private static File getFile(final String path) { 64 final Context context = Factory.get().getApplicationContext(); 65 final File filePath = new File(getDirectory(context), path + ".dat"); 66 67 try { 68 if (!filePath.getCanonicalPath() 69 .startsWith(getDirectory(context).getCanonicalPath())) { 70 LogUtil.e(TAG, "getFile: path " 71 + filePath.getCanonicalPath() 72 + " does not start with " 73 + getDirectory(context).getCanonicalPath()); 74 return null; 75 } 76 } catch (IOException e) { 77 LogUtil.e(TAG, "getFile: getCanonicalPath failed ", e); 78 return null; 79 } 80 return filePath; 81 } 82 getDirectory(final Context context)83 private static File getDirectory(final Context context) { 84 return new File(context.getCacheDir(), RAW_MMS_DIR); 85 } 86 } 87