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      1 /*
      2  * Copyright (C) 2016 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 package com.android.contacts.vcard;
     17 
     18 import android.content.ComponentName;
     19 import android.net.Uri;
     20 import android.os.IBinder;
     21 import android.support.v4.content.FileProvider;
     22 import android.util.Log;
     23 
     24 import com.android.contacts.R;
     25 import com.android.contactsbind.FeedbackHelper;
     26 
     27 import java.io.File;
     28 import java.io.IOException;
     29 import java.text.SimpleDateFormat;
     30 import java.util.Date;
     31 import java.util.Locale;
     32 
     33 /**
     34  * This activity connects to VCardService, creates a .vcf file in cache directory and send export
     35  * request with the file URI so as to write contacts data to the file in background.
     36  */
     37 public class ShareVCardActivity extends ExportVCardActivity {
     38     private static final String LOG_TAG = "VCardShare";
     39     private final String EXPORT_FILE_PREFIX = "vcards_";
     40     private final long A_DAY_IN_MILLIS = 1000 * 60 * 60 * 24;
     41 
     42     @Override
     43     public synchronized void onServiceConnected(ComponentName name, IBinder binder) {
     44         if (DEBUG) Log.d(LOG_TAG, "connected to service, requesting a destination file name");
     45         mConnected = true;
     46         mService = ((VCardService.MyBinder) binder).getService();
     47 
     48         clearExportFiles();
     49 
     50         final File file = getLocalFile();
     51         try {
     52             file.createNewFile();
     53         } catch (IOException e) {
     54             FeedbackHelper.sendFeedback(this, LOG_TAG, "Failed to create .vcf file", e);
     55             finish();
     56             return;
     57         }
     58 
     59         final Uri contentUri = FileProvider.getUriForFile(this,
     60                 getString(R.string.contacts_file_provider_authority), file);
     61         if (DEBUG) Log.d(LOG_TAG, "exporting to " + contentUri);
     62 
     63         final ExportRequest request = new ExportRequest(contentUri);
     64         // The connection object will call finish().
     65         mService.handleExportRequest(request, new NotificationImportExportListener(
     66                 ShareVCardActivity.this));
     67         finish();
     68     }
     69 
     70     /**
     71      * Delete the files (that are untouched for more than 1 day) in the cache directory.
     72      * We cannot rely on VCardService to delete export files because it will delete export files
     73      * right after finishing writing so no files could be shared. Therefore, our approach to
     74      * deleting export files is:
     75      * 1. put export files in cache directory so that Android may delete them;
     76      * 2. manually delete the files that are older than 1 day when service is connected.
     77      */
     78     private void clearExportFiles() {
     79         for (File file : getCacheDir().listFiles()) {
     80             final long ageInMillis = System.currentTimeMillis() - file.lastModified();
     81             if (file.getName().startsWith(EXPORT_FILE_PREFIX) && ageInMillis > A_DAY_IN_MILLIS) {
     82                 file.delete();
     83             }
     84         }
     85     }
     86 
     87     private File getLocalFile() {
     88         final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
     89         final String currentDateString = dateFormat.format(new Date()).toString();
     90         final String localFilename = EXPORT_FILE_PREFIX + currentDateString + ".vcf";
     91         return new File(getCacheDir(), localFilename);
     92     }
     93 }