1/*
2 * Copyright (C) 2009 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
17package com.android.certinstaller;
18
19import android.os.Bundle;
20import android.os.Environment;
21import android.os.FileObserver;
22import android.preference.Preference;
23import android.preference.PreferenceScreen;
24import android.util.Log;
25import android.widget.Toast;
26
27import java.io.File;
28import java.io.IOException;
29import java.util.List;
30
31/**
32 * Lists certificate files in the SD card. User may click one to install it
33 * to the system keystore.
34 */
35public class CertFileList extends CertFile
36        implements Preference.OnPreferenceClickListener {
37    private static final String TAG = "CertFileList";
38
39    private static final String DOWNLOAD_DIR = "download";
40    private static final int MAX_FILE_SIZE = 1000000;
41    private static final int REQUEST_INSTALL_CODE = 1;
42
43    private SdCardMonitor mSdCardMonitor;
44
45    @Override
46    protected void onCreate(Bundle savedInstanceState) {
47        super.onCreate(savedInstanceState);
48
49        addPreferencesFromResource(R.xml.pick_file_pref);
50        createFileList();
51        startSdCardMonitor();
52    }
53
54    @Override
55    protected void onDestroy() {
56        super.onDestroy();
57        stopSdCardMonitor();
58    }
59
60    @Override
61    protected void onInstallationDone(boolean fileDeleted) {
62        if (!fileDeleted) {
63            if (isSdCardPresent()) {
64                setAllFilesEnabled(true);
65            } else {
66                Toast.makeText(this, R.string.sdcard_not_present,
67                        Toast.LENGTH_SHORT).show();
68                finish();
69            }
70        }
71    }
72
73    @Override
74    protected void onError(int errorId) {
75        if (errorId == CERT_FILE_MISSING_ERROR) createFileList();
76    }
77
78    private void setAllFilesEnabled(boolean enabled) {
79        PreferenceScreen root = getPreferenceScreen();
80        for (int i = 0, n = root.getPreferenceCount(); i < n; i++) {
81            root.getPreference(i).setEnabled(enabled);
82        }
83    }
84
85    public boolean onPreferenceClick(Preference pref) {
86        File file = new File(Environment.getExternalStorageDirectory(),
87                pref.getTitle().toString());
88        if (file.isDirectory()) {
89            Log.w(TAG, "impossible to pick a directory! " + file);
90        } else {
91            setAllFilesEnabled(false);
92            installFromFile(file);
93        }
94        return true;
95    }
96
97    private void createFileList() {
98        if (isFinishing()) {
99            Log.d(TAG, "finishing, exit createFileList()");
100            return;
101        } else if (!isSdCardPresent()) {
102            Toast.makeText(this, R.string.sdcard_not_present,
103                    Toast.LENGTH_SHORT).show();
104            finish();
105            return;
106        }
107
108        try {
109            PreferenceScreen root = getPreferenceScreen();
110            root.removeAll();
111
112            List<File> allFiles = getAllCertFiles();
113            if (allFiles.isEmpty()) {
114                Toast.makeText(this, R.string.no_cert_file_found,
115                        Toast.LENGTH_SHORT).show();
116            } else {
117                int prefixEnd = Environment.getExternalStorageDirectory()
118                        .getCanonicalPath().length() + 1;
119                for (File file : allFiles) {
120                    Preference pref = new Preference(this);
121                    pref.setTitle(file.getCanonicalPath().substring(prefixEnd));
122                    root.addPreference(pref);
123                    pref.setOnPreferenceClickListener(this);
124                }
125            }
126        } catch (IOException e) {
127            // should not occur
128            Log.w(TAG, "createFileList(): " + e);
129            throw new RuntimeException(e);
130        }
131    }
132
133    private void startSdCardMonitor() {
134        if (mSdCardMonitor == null) mSdCardMonitor = new SdCardMonitor();
135        mSdCardMonitor.startWatching();
136    }
137
138    private void stopSdCardMonitor() {
139        if (mSdCardMonitor != null) mSdCardMonitor.stopWatching();
140    }
141
142    private class SdCardMonitor {
143        FileObserver mRootMonitor;
144        FileObserver mDownloadMonitor;
145
146        SdCardMonitor() {
147            File root = Environment.getExternalStorageDirectory();
148            mRootMonitor = new FileObserver(root.getPath()) {
149                @Override
150                public void onEvent(int evt, String path) {
151                    commonHandler(evt, path);
152                }
153            };
154
155            File download = new File(root, DOWNLOAD_DIR);
156            mDownloadMonitor = new FileObserver(download.getPath()) {
157                @Override
158                public void onEvent(int evt, String path) {
159                    commonHandler(evt, path);
160                }
161            };
162        }
163
164        private void commonHandler(int evt, String path) {
165            switch (evt) {
166                case FileObserver.CREATE:
167                case FileObserver.DELETE:
168                    if (isFileAcceptable(path)) {
169                        runOnUiThread(new Runnable() {
170                            public void run() {
171                                createFileList();
172                            }
173                        });
174                    }
175                    break;
176            }
177        };
178
179        void startWatching() {
180            mRootMonitor.startWatching();
181            mDownloadMonitor.startWatching();
182        }
183
184        void stopWatching() {
185            mRootMonitor.stopWatching();
186            mDownloadMonitor.stopWatching();
187        }
188    }
189}
190