diff options
Diffstat (limited to 'app/src/main/java/moe/yuuta/gplicense/PreferenceObfuscator.java')
-rw-r--r-- | app/src/main/java/moe/yuuta/gplicense/PreferenceObfuscator.java | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/app/src/main/java/moe/yuuta/gplicense/PreferenceObfuscator.java b/app/src/main/java/moe/yuuta/gplicense/PreferenceObfuscator.java new file mode 100644 index 0000000..0b02276 --- /dev/null +++ b/app/src/main/java/moe/yuuta/gplicense/PreferenceObfuscator.java @@ -0,0 +1,63 @@ +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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