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118 lines
3.9 KiB
118 lines
3.9 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.keychain;
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import android.annotation.Nullable;
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import android.security.CredentialManagementApp;
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import android.util.AtomicFile;
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import android.util.Log;
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import android.util.Xml;
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import com.android.internal.util.FastXmlSerializer;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import org.xmlpull.v1.XmlSerializer;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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public class KeyChainStateStorage {
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private static final String TAG = "KeyChain";
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private static final String TAG_CREDENTIAL_MANAGEMENT_APP = "credential-management-app";
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private final File mDirectory;
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public KeyChainStateStorage(File directory) {
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mDirectory = directory;
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}
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@Nullable
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public CredentialManagementApp loadCredentialManagementApp() {
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CredentialManagementApp credentialManagementApp = null;
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AtomicFile file = getCredentialManagementFile();
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FileInputStream stream = null;
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try {
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stream = file.openRead();
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XmlPullParser parser = Xml.newPullParser();
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parser.setInput(stream, StandardCharsets.UTF_8.name());
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int type;
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while ((type = parser.next()) != XmlPullParser.START_TAG
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&& type != XmlPullParser.END_DOCUMENT) {
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}
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String tag = parser.getName();
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if (TAG_CREDENTIAL_MANAGEMENT_APP.equals(tag)) {
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credentialManagementApp = CredentialManagementApp.readFromXml(parser);
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}
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} catch (XmlPullParserException | IOException e) {
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Log.e(TAG, "Failed to load state", e);
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} finally {
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try {
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if (stream != null) {
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stream.close();
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}
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} catch (IOException e) {
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}
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}
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return credentialManagementApp;
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}
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public void saveCredentialManagementApp(
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@Nullable CredentialManagementApp credentialManagementApp) {
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AtomicFile file = getCredentialManagementFile();
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FileOutputStream stream;
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try {
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stream = file.startWrite();
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} catch (IOException e) {
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Log.e(TAG, "Failed to write state " + e);
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return;
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}
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try {
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XmlSerializer out = new FastXmlSerializer();
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out.setOutput(stream, StandardCharsets.UTF_8.name());
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out.startDocument(null, true);
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if (credentialManagementApp != null) {
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out.startTag(null, TAG_CREDENTIAL_MANAGEMENT_APP);
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credentialManagementApp.writeToXml(out);
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out.endTag(null, TAG_CREDENTIAL_MANAGEMENT_APP);
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}
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out.endDocument();
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file.finishWrite(stream);
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stream.close();
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} catch (IOException e) {
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Log.e(TAG, "Failed to store state");
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file.failWrite(stream);
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}
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}
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private AtomicFile getCredentialManagementFile() {
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File file = new File(mDirectory, "credential-management-app.xml");
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if (!file.exists()) {
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try {
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file.createNewFile();
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} catch (IOException e) {
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}
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}
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return new AtomicFile(file);
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}
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}
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