1 /*
2  * Copyright (C) 2012 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.providers.contacts.debug;
18 
19 import android.content.ContentProvider;
20 import android.content.ContentValues;
21 import android.database.Cursor;
22 import android.database.MatrixCursor;
23 import android.net.Uri;
24 import android.os.ParcelFileDescriptor;
25 import android.provider.OpenableColumns;
26 
27 import java.io.File;
28 import java.io.FileNotFoundException;
29 
30 /**
31  * Provider used to read dump files created by {@link DataExporter}.
32  *
33  * We send content: URI to sender apps (such as gmail).  This provider implement the URI.
34  */
35 public class DumpFileProvider extends ContentProvider {
36     public static final String AUTHORITY = "com.android.contacts.dumpfile";
37     public static final Uri AUTHORITY_URI = Uri.parse("content://" + AUTHORITY);
38 
39     @Override
onCreate()40     public boolean onCreate() {
41         return true;
42     }
43 
44     @Override
insert(Uri uri, ContentValues values)45     public Uri insert(Uri uri, ContentValues values) {
46         // Not needed.
47         throw new UnsupportedOperationException();
48     }
49 
50     @Override
delete(Uri uri, String selection, String[] selectionArgs)51     public int delete(Uri uri, String selection, String[] selectionArgs) {
52         // Not needed.
53         throw new UnsupportedOperationException();
54     }
55 
56     @Override
update(Uri uri, ContentValues values, String selection, String[] selectionArgs)57     public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
58         // Not needed.
59         throw new UnsupportedOperationException();
60     }
61 
62     @Override
getType(Uri uri)63     public String getType(Uri uri) {
64         return DataExporter.ZIP_MIME_TYPE;
65     }
66 
67     /** @return the path part of a URI, without the beginning "/". */
extractFileName(Uri uri)68     private static String extractFileName(Uri uri) {
69         final String path = uri.getPath();
70         return path.startsWith("/") ? path.substring(1) : path;
71     }
72 
73     /** @return file content */
74     @Override
openFile(Uri uri, String mode)75     public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
76         if (!"r".equals(mode)) {
77             throw new UnsupportedOperationException();
78         }
79 
80         final String fileName = extractFileName(uri);
81         DataExporter.ensureValidFileName(fileName);
82         final File file = DataExporter.getOutputFile(getContext(), fileName);
83         return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
84     }
85 
86     /**
87      * Used to provide {@link OpenableColumns#DISPLAY_NAME} and {@link OpenableColumns#SIZE}
88      * for a URI.
89      */
90     @Override
query(Uri uri, String[] inProjection, String selection, String[] selectionArgs, String sortOrder)91     public Cursor query(Uri uri, String[] inProjection, String selection, String[] selectionArgs,
92             String sortOrder) {
93         final String fileName = extractFileName(uri);
94         DataExporter.ensureValidFileName(fileName);
95 
96         final String[] projection = (inProjection != null) ? inProjection
97                 : new String[] {OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE};
98 
99         final MatrixCursor c = new MatrixCursor(projection);
100 
101         // Result will always have one row.
102         final MatrixCursor.RowBuilder b = c.newRow();
103 
104         for (int i = 0; i < c.getColumnCount(); i++) {
105             final String column = projection[i];
106             if (OpenableColumns.DISPLAY_NAME.equals(column)) {
107                 // Just return the requested path as the display name.  We don't care if the file
108                 // really exists.
109                 b.add(fileName);
110             } else if (OpenableColumns.SIZE.equals(column)) {
111                 final File file = DataExporter.getOutputFile(getContext(), fileName);
112 
113                 if (file.exists()) {
114                     b.add(file.length());
115                 } else {
116                     // File doesn't exist -- return null for "unknown".
117                     b.add(null);
118                 }
119             } else {
120                 throw new IllegalArgumentException("Unknown column " + column);
121             }
122         }
123 
124         return c;
125     }
126 
127 }
128