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/*
* Copyright (C) 2012 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.providers.contacts.debug;
import com.android.providers.contacts.util.Hex;
import com.google.common.io.Closeables;
import android.content.Context;
import android.net.Uri;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.SecureRandom;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/**
* Compress all files under the app data dir into a single zip file.
*
* Make sure not to output dump filenames anywhere, including logcat.
*/
public class DataExporter {
private static String TAG = "DataExporter";
public static final String ZIP_MIME_TYPE = "application/zip";
public static final String DUMP_FILE_DIRECTORY_NAME = "dumpedfiles";
public static final String OUT_FILE_SUFFIX = "-contacts-db.zip";
/**
* Compress all files under the app data dir into a single zip file, and return the content://
* URI to the file, which can be read via {@link DumpFileProvider}.
*/
public static Uri exportData(Context context) throws IOException {
final String fileName = generateRandomName() + OUT_FILE_SUFFIX;
final File outFile = getOutputFile(context, fileName);
// Remove all existing ones.
removeDumpFiles(context);
Log.i(TAG, "Dump started...");
ensureOutputDirectory(context);
final ZipOutputStream os = new ZipOutputStream(new FileOutputStream(outFile));
try {
addDirectory(context, os, context.getFilesDir().getParentFile(), "contacts-files");
} finally {
Closeables.closeQuietly(os);
}
Log.i(TAG, "Dump finished.");
return DumpFileProvider.AUTHORITY_URI.buildUpon().appendPath(fileName).build();
}
/** @return long random string for a file name */
private static String generateRandomName() {
final SecureRandom rng = new SecureRandom();
final byte[] random = new byte[256 / 8];
rng.nextBytes(random);
return Hex.encodeHex(random, true);
}
private static File getOutputDirectory(Context context) {
return new File(context.getCacheDir(), DUMP_FILE_DIRECTORY_NAME);
}
private static void ensureOutputDirectory(Context context) {
final File directory = getOutputDirectory(context);
if (!directory.exists()) {
directory.mkdir();
}
}
public static File getOutputFile(Context context, String fileName) {
return new File(getOutputDirectory(context), fileName);
}
public static boolean dumpFileExists(Context context) {
return getOutputDirectory(context).exists();
}
public static void removeDumpFiles(Context context) {
removeFileOrDirectory(getOutputDirectory(context));
}
private static void removeFileOrDirectory(File file) {
if (!file.exists()) return;
if (file.isFile()) {
Log.i(TAG, "Removing " + file);
file.delete();
return;
}
if (file.isDirectory()) {
for (File child : file.listFiles()) {
removeFileOrDirectory(child);
}
Log.i(TAG, "Removing " + file);
file.delete();
}
}
/**
* Add all files under {@code current} to {@code os} zip stream
*/
private static void addDirectory(Context context, ZipOutputStream os, File current,
String storedPath) throws IOException {
for (File child : current.listFiles()) {
final String childStoredPath = storedPath + "/" + child.getName();
if (child.isDirectory()) {
// Don't need the cache directory, which also contains the dump files.
if (child.equals(context.getCacheDir())) {
continue;
}
// This check is redundant as the output directory should be in the cache dir,
// but just in case...
if (child.getName().equals(DUMP_FILE_DIRECTORY_NAME)) {
continue;
}
addDirectory(context, os, child, childStoredPath);
} else if (child.isFile()) {
addFile(os, child, childStoredPath);
} else {
// Shouldn't happen; skip.
}
}
}
/**
* Add a single file {@code current} to {@code os} zip stream using the file name
* {@code storedPath}.
*/
private static void addFile(ZipOutputStream os, File current, String storedPath)
throws IOException {
Log.i(TAG, "Adding " + current.getAbsolutePath() + " ...");
final InputStream is = new FileInputStream(current);
os.putNextEntry(new ZipEntry(storedPath));
final byte[] buf = new byte[32 * 1024];
int totalLen = 0;
while (true) {
int len = is.read(buf);
if (len <= 0) {
break;
}
os.write(buf, 0, len);
totalLen += len;
}
os.closeEntry();
Log.i(TAG, "Added " + current.getAbsolutePath() + " as " + storedPath +
" (" + totalLen + " bytes)");
}
}
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