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/*
* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.provider;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.provider.OpenableColumns;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.util.DatabaseUtil;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
public class TemporaryStorageProvider extends ContentProvider {
private static final String DB_NAME = "tempstorage.db";
private static final String TABLE_FILES = "files";
private static final String COLUMN_ID = "id";
private static final String COLUMN_NAME = "name";
private static final String COLUMN_TIME = "time";
private static final Uri BASE_URI = Uri.parse("content://org.sufficientlysecure.keychain.tempstorage/");
private static final int DB_VERSION = 1;
public static Uri createFile(Context context, String targetName) {
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_NAME, targetName);
return context.getContentResolver().insert(BASE_URI, contentValues);
}
public static int cleanUp(Context context) {
return context.getContentResolver().delete(BASE_URI, COLUMN_TIME + "< ?",
new String[]{Long.toString(System.currentTimeMillis() - Constants.TEMPFILE_TTL)});
}
private class TemporaryStorageDatabase extends SQLiteOpenHelper {
public TemporaryStorageDatabase(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_FILES + " (" +
COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_NAME + " TEXT, " +
COLUMN_TIME + " INTEGER" +
");");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
private TemporaryStorageDatabase db;
private File getFile(Uri uri) throws FileNotFoundException {
try {
return getFile(Integer.parseInt(uri.getLastPathSegment()));
} catch (NumberFormatException e) {
throw new FileNotFoundException();
}
}
private File getFile(int id) {
return new File(getContext().getCacheDir(), "temp/" + id);
}
@Override
public boolean onCreate() {
db = new TemporaryStorageDatabase(getContext());
return new File(getContext().getCacheDir(), "temp").mkdirs();
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
File file;
try {
file = getFile(uri);
} catch (FileNotFoundException e) {
return null;
}
Cursor fileName = db.getReadableDatabase().query(TABLE_FILES, new String[]{COLUMN_NAME}, COLUMN_ID + "=?",
new String[]{uri.getLastPathSegment()}, null, null, null);
if (fileName != null) {
if (fileName.moveToNext()) {
MatrixCursor cursor =
new MatrixCursor(new String[]{OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE, "_data"});
cursor.newRow().add(fileName.getString(0)).add(file.length()).add(file.getAbsolutePath());
fileName.close();
return cursor;
}
fileName.close();
}
return null;
}
@Override
public String getType(Uri uri) {
// Note: If we can find a files mime type, we can decrypt it to temp storage and open it after
// encryption. The mime type is needed, else UI really sucks and some apps break.
return "*/*";
}
@Override
public Uri insert(Uri uri, ContentValues values) {
if (!values.containsKey(COLUMN_TIME)) {
values.put(COLUMN_TIME, System.currentTimeMillis());
}
int insert = (int) db.getWritableDatabase().insert(TABLE_FILES, null, values);
try {
getFile(insert).createNewFile();
} catch (IOException e) {
return null;
}
return Uri.withAppendedPath(BASE_URI, Long.toString(insert));
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
if (uri.getLastPathSegment() != null) {
selection = DatabaseUtil.concatenateWhere(selection, COLUMN_ID + "=?");
selectionArgs = DatabaseUtil.appendSelectionArgs(selectionArgs, new String[]{uri.getLastPathSegment()});
}
Cursor files = db.getReadableDatabase().query(TABLE_FILES, new String[]{COLUMN_ID}, selection,
selectionArgs, null, null, null);
if (files != null) {
while (files.moveToNext()) {
getFile(files.getInt(0)).delete();
}
files.close();
return db.getWritableDatabase().delete(TABLE_FILES, selection, selectionArgs);
}
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
throw new UnsupportedOperationException("Update not supported");
}
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
return openFileHelper(uri, mode);
}
}
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