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/*
* Copyright (C) 2018 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 android.database;
import android.annotation.NonNull;
import android.util.SparseArray;
import java.util.Map;
/**
* Cursor that offers to redact values of requested columns.
*
* @hide
*/
public class RedactingCursor extends CrossProcessCursorWrapper {
private final SparseArray<Object> mRedactions;
private RedactingCursor(@NonNull Cursor cursor, SparseArray<Object> redactions) {
super(cursor);
mRedactions = redactions;
}
/**
* Create a wrapped instance of the given {@link Cursor} which redacts the
* requested columns so they always return specific values when accessed.
* <p>
* If a redacted column appears multiple times in the underlying cursor, all
* instances will be redacted. If none of the redacted columns appear in the
* given cursor, the given cursor will be returned untouched to improve
* performance.
*/
public static Cursor create(@NonNull Cursor cursor, @NonNull Map<String, Object> redactions) {
final SparseArray<Object> internalRedactions = new SparseArray<>();
final String[] columns = cursor.getColumnNames();
for (int i = 0; i < columns.length; i++) {
if (redactions.containsKey(columns[i])) {
internalRedactions.put(i, redactions.get(columns[i]));
}
}
if (internalRedactions.size() == 0) {
return cursor;
} else {
return new RedactingCursor(cursor, internalRedactions);
}
}
@Override
public void fillWindow(int position, CursorWindow window) {
// Fill window directly to ensure data is redacted
DatabaseUtils.cursorFillWindow(this, position, window);
}
@Override
public CursorWindow getWindow() {
// Returning underlying window risks leaking redacted data
return null;
}
@Override
public Cursor getWrappedCursor() {
throw new UnsupportedOperationException(
"Returning underlying cursor risks leaking redacted data");
}
@Override
public double getDouble(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return (double) mRedactions.valueAt(i);
} else {
return super.getDouble(columnIndex);
}
}
@Override
public float getFloat(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return (float) mRedactions.valueAt(i);
} else {
return super.getFloat(columnIndex);
}
}
@Override
public int getInt(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return (int) mRedactions.valueAt(i);
} else {
return super.getInt(columnIndex);
}
}
@Override
public long getLong(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return (long) mRedactions.valueAt(i);
} else {
return super.getLong(columnIndex);
}
}
@Override
public short getShort(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return (short) mRedactions.valueAt(i);
} else {
return super.getShort(columnIndex);
}
}
@Override
public String getString(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return (String) mRedactions.valueAt(i);
} else {
return super.getString(columnIndex);
}
}
@Override
public void copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
buffer.data = ((String) mRedactions.valueAt(i)).toCharArray();
buffer.sizeCopied = buffer.data.length;
} else {
super.copyStringToBuffer(columnIndex, buffer);
}
}
@Override
public byte[] getBlob(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return (byte[]) mRedactions.valueAt(i);
} else {
return super.getBlob(columnIndex);
}
}
@Override
public int getType(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return DatabaseUtils.getTypeOfObject(mRedactions.valueAt(i));
} else {
return super.getType(columnIndex);
}
}
@Override
public boolean isNull(int columnIndex) {
final int i = mRedactions.indexOfKey(columnIndex);
if (i >= 0) {
return mRedactions.valueAt(i) == null;
} else {
return super.isNull(columnIndex);
}
}
}
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