/*
* Copyright (C) 2009 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.certinstaller;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.preference.PreferenceActivity;
import android.security.Credentials;
import android.security.KeyChain;
import android.util.Log;
import android.widget.Toast;
import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Base class that deals with certificate files on the SD card.
*/
public class CertFile extends PreferenceActivity implements FileFilter {
static final int CERT_READ_ERROR = R.string.cert_read_error;
static final int CERT_TOO_LARGE_ERROR = R.string.cert_too_large_error;
static final int CERT_FILE_MISSING_ERROR = R.string.cert_missing_error;
static final String DOWNLOAD_DIR = "download";
private static final String TAG = "CertFile";
private static final String CERT_FILE_KEY = "cf";
private static final int MAX_FILE_SIZE = 1000000;
protected static final int REQUEST_INSTALL_CODE = 1;
private File mCertFile;
@Override
protected void onSaveInstanceState(Bundle outStates) {
super.onSaveInstanceState(outStates);
if (mCertFile != null) {
outStates.putString(CERT_FILE_KEY, mCertFile.getAbsolutePath());
}
}
@Override
protected void onRestoreInstanceState(Bundle savedStates) {
super.onRestoreInstanceState(savedStates);
String path = savedStates.getString(CERT_FILE_KEY);
if (path != null) {
mCertFile = new File(path);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_INSTALL_CODE) {
boolean success = (resultCode == RESULT_OK
&& (mCertFile == null || Util.deleteFile(mCertFile)));
onInstallationDone(success);
mCertFile = null;
} else {
Log.w(TAG, "unknown request code: " + requestCode);
}
}
/**
* Called when installation is done.
*
* @param success true if installation is done successfully
*/
protected void onInstallationDone(boolean success) {
if (success) {
setResult(RESULT_OK);
}
}
/**
* Called when an error occurs when reading a certificate file.
*
* @param errorId one of {@link #CERT_READ_ERROR},
* {@link #CERT_TOO_LARGE_ERROR} and {@link #CERT_FILE_MISSING_ERROR}
*/
protected void onError(int errorId) {
}
/**
* Returns a list of certificate files found on the SD card.
*/
protected List<File> getAllCertFiles() {
List<File> allFiles = new ArrayList<File>();
File root = Environment.getExternalStorageDirectory();
File download = new File(root, DOWNLOAD_DIR);
if (download != null) {
File[] files = download.listFiles(this);
if (files != null) {
Collections.addAll(allFiles, files);
}
}
File[] files = root.listFiles(this);
if (files != null) {
Collections.addAll(allFiles, files);
}
return allFiles;
}
/**
* Invokes {@link CertInstaller} to install the certificate(s) in the file.
*
* @param file the certificate file
*/
protected void installFromFile(File file) {
Log.d(TAG, "install cert from " + file);
if (file.exists()) {
if (file.length() < MAX_FILE_SIZE) {
byte[] data = Util.readFile(file);
if (data == null) {
toastError(CERT_READ_ERROR);
onError(CERT_READ_ERROR);
return;
}
mCertFile = file;
install(file.getName(), data);
} else {
Log.w(TAG, "cert file is too large: " + file.length());
toastError(CERT_TOO_LARGE_ERROR);
onError(CERT_TOO_LARGE_ERROR);
}
} else {
Log.w(TAG, "cert file does not exist");
toastError(CERT_FILE_MISSING_ERROR);
onError(CERT_FILE_MISSING_ERROR);
}
}
@Override public boolean accept(File file) {
if (!file.isDirectory()) {
return isFileAcceptable(file.getPath());
} else {
return false;
}
}
protected boolean isFileAcceptable(String path) {
return (path.endsWith(Credentials.EXTENSION_CRT) ||
path.endsWith(Credentials.EXTENSION_P12) ||
path.endsWith(Credentials.EXTENSION_CER) ||
path.endsWith(Credentials.EXTENSION_PFX));
}
protected boolean isSdCardPresent() {
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}
private void install(String fileName, byte[] value) {
Intent intent = new Intent(this, CertInstaller.class);
intent.putExtra(CredentialHelper.CERT_NAME_KEY, fileName);
if (fileName.endsWith(Credentials.EXTENSION_PFX)
|| fileName.endsWith(Credentials.EXTENSION_P12)) {
intent.putExtra(KeyChain.EXTRA_PKCS12, value);
} else if (fileName.endsWith(Credentials.EXTENSION_CER)
|| fileName.endsWith(Credentials.EXTENSION_CRT)) {
intent.putExtra(KeyChain.EXTRA_CERTIFICATE, value);
} else {
throw new AssertionError(fileName);
}
startActivityForResult(intent, REQUEST_INSTALL_CODE);
}
private void toastError(int msgId) {
Toast.makeText(this, msgId, Toast.LENGTH_LONG).show();
}
}