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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.keychain;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.RemoteException;
import android.security.Credentials;
import android.security.IKeyChainAliasResponse;
import android.security.KeyChain;
import android.security.KeyStore;
import android.view.View;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class KeyChainActivity extends ListActivity {
private static final String TAG = "KeyChainActivity";
private static String KEY_STATE = "state";
private static final int REQUEST_UNLOCK = 1;
private static enum State { INITIAL, UNLOCK_REQUESTED };
private State mState;
private KeyStore mKeyStore = KeyStore.getInstance();
private boolean isKeyStoreUnlocked() {
return mKeyStore.state() == KeyStore.State.UNLOCKED;
}
private boolean isKeyStoreEmpty() {
String[] aliases = mKeyStore.saw(Credentials.USER_PRIVATE_KEY);
return (aliases == null || aliases.length == 0);
}
@Override public void onCreate(Bundle savedState) {
super.onCreate(savedState);
if (savedState == null) {
mState = State.INITIAL;
} else {
mState = (State) savedState.getSerializable(KEY_STATE);
if (mState == null) {
mState = State.INITIAL;
}
}
}
@Override public void onResume() {
super.onResume();
// see if KeyStore has been unlocked, if not start activity to do so
switch (mState) {
case INITIAL:
if (isKeyStoreEmpty()) {
finish(null);
return;
}
if (!isKeyStoreUnlocked()) {
mState = State.UNLOCK_REQUESTED;
this.startActivityForResult(new Intent(Credentials.UNLOCK_ACTION),
REQUEST_UNLOCK);
// Note that Credentials.unlock will start an
// Activity and we will be paused but then resumed
// when the unlock Activity completes and our
// onActivityResult is called with REQUEST_UNLOCK
return;
}
showAliasList();
return;
case UNLOCK_REQUESTED:
// we've already asked, but have not heard back, probably just rotated.
// wait to hear back via onActivityResult
return;
default:
throw new AssertionError();
}
}
private void showAliasList() {
String[] aliases = mKeyStore.saw(Credentials.USER_PRIVATE_KEY);
if (aliases == null || aliases.length == 0) {
finish(null);
return;
}
final ArrayAdapter<String> adapter
= new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
aliases);
setListAdapter(adapter);
ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override public void onItemClick(AdapterView<?> parent,
View view,
int position,
long id) {
String alias = adapter.getItem(position);
finish(alias);
}
});
}
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_UNLOCK:
if (isKeyStoreUnlocked()) {
showAliasList();
} else {
// user must have canceled unlock, give up
finish(null);
}
return;
default:
throw new AssertionError();
}
}
private void finish(String alias) {
if (alias == null) {
setResult(RESULT_CANCELED);
} else {
Intent result = new Intent();
result.putExtra(Intent.EXTRA_TEXT, alias);
setResult(RESULT_OK, result);
}
IKeyChainAliasResponse keyChainAliasResponse
= IKeyChainAliasResponse.Stub.asInterface(
getIntent().getIBinderExtra(KeyChain.EXTRA_RESPONSE));
if (keyChainAliasResponse != null) {
try {
keyChainAliasResponse.alias(alias);
} catch (Exception ignored) {
// don't just catch RemoteException, caller could
// throw back a RuntimeException across processes
// which we should protect against.
}
}
finish();
}
@Override public void onBackPressed() {
finish(null);
}
@Override protected void onSaveInstanceState(Bundle savedState) {
super.onSaveInstanceState(savedState);
if (mState != State.INITIAL) {
savedState.putSerializable(KEY_STATE, mState);
}
}
}
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