diff options
Diffstat (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java')
-rw-r--r-- | OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java new file mode 100644 index 000000000..87c0cc0a6 --- /dev/null +++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java @@ -0,0 +1,171 @@ +/* + * 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); + } +} |