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.settings.vpn;
18
19import com.android.settings.R;
20
21import android.app.AlertDialog;
22import android.content.DialogInterface;
23import android.content.Intent;
24import android.net.vpn.L2tpIpsecProfile;
25import android.net.vpn.L2tpIpsecPskProfile;
26import android.net.vpn.L2tpProfile;
27import android.net.vpn.PptpProfile;
28import android.net.vpn.VpnProfile;
29import android.net.vpn.VpnType;
30import android.os.Bundle;
31import android.os.Parcel;
32import android.os.Parcelable;
33import android.preference.PreferenceActivity;
34import android.preference.PreferenceGroup;
35import android.text.TextUtils;
36import android.view.KeyEvent;
37import android.view.Menu;
38import android.view.MenuItem;
39import android.view.View;
40
41/**
42 * The activity class for editing a new or existing VPN profile.
43 */
44public class VpnEditor extends PreferenceActivity {
45    private static final int MENU_SAVE = Menu.FIRST;
46    private static final int MENU_CANCEL = Menu.FIRST + 1;
47    private static final String KEY_PROFILE = "profile";
48    private static final String KEY_ORIGINAL_PROFILE_NAME = "orig_profile_name";
49
50    private VpnProfileEditor mProfileEditor;
51    private boolean mAddingProfile;
52    private byte[] mOriginalProfileData;
53
54    @Override
55    public void onCreate(Bundle savedInstanceState) {
56        super.onCreate(savedInstanceState);
57        VpnProfile p = (VpnProfile) ((savedInstanceState == null)
58                ? getIntent().getParcelableExtra(VpnSettings.KEY_VPN_PROFILE)
59                : savedInstanceState.getParcelable(KEY_PROFILE));
60        mProfileEditor = getEditor(p);
61        mAddingProfile = TextUtils.isEmpty(p.getName());
62
63        // Loads the XML preferences file
64        addPreferencesFromResource(R.xml.vpn_edit);
65
66        initViewFor(p);
67
68        Parcel parcel = Parcel.obtain();
69        p.writeToParcel(parcel, 0);
70        mOriginalProfileData = parcel.marshall();
71    }
72
73    @Override
74    protected synchronized void onSaveInstanceState(Bundle outState) {
75        if (mProfileEditor == null) return;
76
77        outState.putParcelable(KEY_PROFILE, getProfile());
78    }
79
80    @Override
81    public boolean onCreateOptionsMenu(Menu menu) {
82        super.onCreateOptionsMenu(menu);
83        menu.add(0, MENU_SAVE, 0, R.string.vpn_menu_done)
84            .setIcon(android.R.drawable.ic_menu_save);
85        menu.add(0, MENU_CANCEL, 0,
86                mAddingProfile ? R.string.vpn_menu_cancel
87                               : R.string.vpn_menu_revert)
88            .setIcon(android.R.drawable.ic_menu_close_clear_cancel);
89        return true;
90    }
91
92    @Override
93    public boolean onOptionsItemSelected(MenuItem item) {
94        switch (item.getItemId()) {
95            case MENU_SAVE:
96                if (validateAndSetResult()) finish();
97                return true;
98
99            case MENU_CANCEL:
100                if (profileChanged()) {
101                    showCancellationConfirmDialog();
102                } else {
103                    finish();
104                }
105                return true;
106        }
107        return super.onOptionsItemSelected(item);
108    }
109
110    @Override
111    public boolean onKeyDown(int keyCode, KeyEvent event) {
112        switch (keyCode) {
113            case KeyEvent.KEYCODE_BACK:
114                if (validateAndSetResult()) finish();
115                return true;
116        }
117        return super.onKeyDown(keyCode, event);
118    }
119
120    private void initViewFor(VpnProfile profile) {
121        setTitle(profile);
122        mProfileEditor.loadPreferencesTo(getPreferenceScreen());
123    }
124
125    private void setTitle(VpnProfile profile) {
126        String formatString = mAddingProfile
127                ? getString(R.string.vpn_edit_title_add)
128                : getString(R.string.vpn_edit_title_edit);
129        setTitle(String.format(formatString,
130                profile.getType().getDisplayName()));
131    }
132
133    /**
134     * Checks the validity of the inputs and set the profile as result if valid.
135     * @return true if the result is successfully set
136     */
137    private boolean validateAndSetResult() {
138        String errorMsg = mProfileEditor.validate();
139
140        if (errorMsg != null) {
141            Util.showErrorMessage(this, errorMsg);
142            return false;
143        }
144
145        if (profileChanged()) setResult(getProfile());
146        return true;
147    }
148
149    private void setResult(VpnProfile p) {
150        Intent intent = new Intent(this, VpnSettings.class);
151        intent.putExtra(VpnSettings.KEY_VPN_PROFILE, (Parcelable) p);
152        setResult(RESULT_OK, intent);
153    }
154
155    private VpnProfileEditor getEditor(VpnProfile p) {
156        switch (p.getType()) {
157            case L2TP_IPSEC:
158                return new L2tpIpsecEditor((L2tpIpsecProfile) p);
159
160            case L2TP_IPSEC_PSK:
161                return new L2tpIpsecPskEditor((L2tpIpsecPskProfile) p);
162
163            case L2TP:
164                return new L2tpEditor((L2tpProfile) p);
165
166            case PPTP:
167                return new PptpEditor((PptpProfile) p);
168
169            default:
170                return new VpnProfileEditor(p);
171        }
172    }
173
174    private void showCancellationConfirmDialog() {
175        new AlertDialog.Builder(this)
176                .setTitle(android.R.string.dialog_alert_title)
177                .setIcon(android.R.drawable.ic_dialog_alert)
178                .setMessage(mAddingProfile
179                        ? R.string.vpn_confirm_add_profile_cancellation
180                        : R.string.vpn_confirm_edit_profile_cancellation)
181                .setPositiveButton(R.string.vpn_yes_button,
182                        new DialogInterface.OnClickListener() {
183                            public void onClick(DialogInterface dialog, int w) {
184                                finish();
185                            }
186                        })
187                .setNegativeButton(R.string.vpn_mistake_button, null)
188                .show();
189    }
190
191    private VpnProfile getProfile() {
192        return mProfileEditor.getProfile();
193    }
194
195    private boolean profileChanged() {
196        Parcel newParcel = Parcel.obtain();
197        getProfile().writeToParcel(newParcel, 0);
198        byte[] newData = newParcel.marshall();
199        if (mOriginalProfileData.length == newData.length) {
200            for (int i = 0, n = mOriginalProfileData.length; i < n; i++) {
201                if (mOriginalProfileData[i] != newData[i]) return true;
202            }
203            return false;
204        }
205        return true;
206    }
207}
208