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      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 android.support.v4.util.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.util.List;
     36 
     37 /**
     38  * A very simple content provider that can serve media files from our cache directory.
     39  */
     40 public class MediaScratchFileProvider extends FileProvider {
     41     private static final String TAG = LogUtil.BUGLE_TAG;
     42 
     43     private static final SimpleArrayMap<Uri, String> sUriToDisplayNameMap =
     44             new SimpleArrayMap<Uri, String>();
     45 
     46     @VisibleForTesting
     47     public static final String AUTHORITY =
     48             "com.android.messaging.datamodel.MediaScratchFileProvider";
     49     private static final String MEDIA_SCRATCH_SPACE_DIR = "mediascratchspace";
     50 
     51     public static boolean isMediaScratchSpaceUri(final Uri uri) {
     52         if (uri == null) {
     53             return false;
     54         }
     55 
     56         final List<String> segments = uri.getPathSegments();
     57         return (TextUtils.equals(uri.getScheme(), ContentResolver.SCHEME_CONTENT) &&
     58                 TextUtils.equals(uri.getAuthority(), AUTHORITY) &&
     59                 segments.size() == 1 && FileProvider.isValidFileId(segments.get(0)));
     60     }
     61 
     62     /**
     63      * Returns a uri that can be used to access a raw mms file.
     64      *
     65      * @return the URI for an raw mms file
     66      */
     67     public static Uri buildMediaScratchSpaceUri(final String extension) {
     68         final Uri uri = FileProvider.buildFileUri(AUTHORITY, extension);
     69         final File file = getFileWithExtension(uri.getPath(), extension);
     70         if (!ensureFileExists(file)) {
     71             LogUtil.e(TAG, "Failed to create temp file " + file.getAbsolutePath());
     72         }
     73         return uri;
     74     }
     75 
     76     public static File getFileFromUri(final Uri uri) {
     77         Assert.equals(AUTHORITY, uri.getAuthority());
     78         return getFileWithExtension(uri.getPath(), getExtensionFromUri(uri));
     79     }
     80 
     81     public static Uri.Builder getUriBuilder() {
     82         return (new Uri.Builder()).authority(AUTHORITY).scheme(ContentResolver.SCHEME_CONTENT);
     83     }
     84 
     85     @Override
     86     File getFile(final String path, final String extension) {
     87         return getFileWithExtension(path, extension);
     88     }
     89 
     90     private static File getFileWithExtension(final String path, final String extension) {
     91         final Context context = Factory.get().getApplicationContext();
     92         return new File(getDirectory(context),
     93                 TextUtils.isEmpty(extension) ? path : path + "." + extension);
     94     }
     95 
     96     private static File getDirectory(final Context context) {
     97         return new File(context.getCacheDir(), MEDIA_SCRATCH_SPACE_DIR);
     98     }
     99 
    100     @Override
    101     public Cursor query(final Uri uri, final String[] projection, final String selection,
    102             final String[] selectionArgs, final String sortOrder) {
    103         if (projection != null && projection.length > 0 &&
    104                 TextUtils.equals(projection[0], OpenableColumns.DISPLAY_NAME) &&
    105                 isMediaScratchSpaceUri(uri)) {
    106             // Retrieve the display name associated with a temp file. This is used by the Contacts
    107             // ImportVCardActivity to retrieve the name of the contact(s) being imported.
    108             String displayName;
    109             synchronized (sUriToDisplayNameMap) {
    110                 displayName = sUriToDisplayNameMap.get(uri);
    111             }
    112             if (!TextUtils.isEmpty(displayName)) {
    113                 MatrixCursor cursor =
    114                         new MatrixCursor(new String[] { OpenableColumns.DISPLAY_NAME });
    115                 RowBuilder row = cursor.newRow();
    116                 row.add(displayName);
    117                 return cursor;
    118             }
    119         }
    120         return null;
    121     }
    122 
    123     public static void addUriToDisplayNameEntry(final Uri scratchFileUri,
    124             final String displayName) {
    125         if (TextUtils.isEmpty(displayName)) {
    126             return;
    127         }
    128         synchronized (sUriToDisplayNameMap) {
    129             sUriToDisplayNameMap.put(scratchFileUri, displayName);
    130         }
    131     }
    132 }
    133