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package moe.yuuta.gplicense;
import android.content.SharedPreferences;
import com.elvishew.xlog.Logger;
import com.elvishew.xlog.XLog;
/**
* An wrapper for SharedPreferences that transparently performs data obfuscation.
*/
public class PreferenceObfuscator {
private static final Logger logger = XLog.tag("PrefObfs").build();
private final SharedPreferences mPreferences;
private final Obfuscator mObfuscator;
private SharedPreferences.Editor mEditor;
/**
* Constructor.
*
* @param sp A SharedPreferences instance provided by the system.
* @param o The Obfuscator to use when reading or writing data.
*/
public PreferenceObfuscator(SharedPreferences sp, Obfuscator o) {
mPreferences = sp;
mObfuscator = o;
mEditor = null;
}
public void putString(String key, String value) {
if (mEditor == null) {
mEditor = mPreferences.edit();
}
String obfuscatedValue = mObfuscator.obfuscate(value, key);
mEditor.putString(key, obfuscatedValue);
}
public String getString(String key, String defValue) {
String result;
String value = mPreferences.getString(key, null);
if (value != null) {
try {
result = mObfuscator.unobfuscate(value, key);
} catch (ValidationException e) {
// Unable to unobfuscate, data corrupt or tampered
logger.w("Validation error while reading preference: " + key);
result = defValue;
}
} else {
// Preference not found
result = defValue;
}
return result;
}
public void commit() {
if (mEditor != null) {
mEditor.commit();
mEditor = null;
}
}
}
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