| /* |
| * Copyright (C) 2017 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.service.autofill; |
| |
| import static android.view.autofill.Helper.sDebug; |
| |
| import android.annotation.NonNull; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.text.TextUtils; |
| import android.util.Log; |
| import android.view.autofill.AutofillId; |
| |
| import com.android.internal.util.Preconditions; |
| |
| /** |
| * Validator that returns {@code true} if the number created by concatenating all given fields |
| * pass a Luhn algorithm checksum. |
| * |
| * <p>See {@link SaveInfo.Builder#setValidator(Validator)} for examples. |
| */ |
| public final class LuhnChecksumValidator extends InternalValidator implements Parcelable { |
| private static final String TAG = "LuhnChecksumValidator"; |
| |
| private final AutofillId[] mIds; |
| |
| /** |
| * Default constructor. |
| * |
| * @param ids id of fields that comprises the number to be checked. |
| */ |
| public LuhnChecksumValidator(@NonNull AutofillId... ids) { |
| mIds = Preconditions.checkArrayElementsNotNull(ids, "ids"); |
| } |
| |
| /** @hide */ |
| @Override |
| public boolean isValid(@NonNull ValueFinder finder) { |
| if (mIds == null || mIds.length == 0) return false; |
| |
| final StringBuilder number = new StringBuilder(); |
| for (AutofillId id : mIds) { |
| final String partialNumber = finder.findByAutofillId(id); |
| if (partialNumber == null) { |
| if (sDebug) Log.d(TAG, "No partial number for id " + id); |
| return false; |
| } |
| number.append(partialNumber); |
| } |
| final boolean isValid = TextUtils.isDigitsOnly(number.toString()); |
| if (sDebug) Log.d(TAG, "Is valid: " + isValid); |
| // TODO(b/62534917): proper implementation - copy & paste code from: |
| // PaymentUtils.java |
| // PaymentUtilsTest.java |
| return isValid; |
| } |
| |
| ///////////////////////////////////// |
| // Parcelable "contract" methods. // |
| ///////////////////////////////////// |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel parcel, int flags) { |
| parcel.writeParcelableArray(mIds, flags); |
| } |
| |
| public static final Parcelable.Creator<LuhnChecksumValidator> CREATOR = |
| new Parcelable.Creator<LuhnChecksumValidator>() { |
| @Override |
| public LuhnChecksumValidator createFromParcel(Parcel parcel) { |
| return new LuhnChecksumValidator(parcel.readParcelableArray(null, AutofillId.class)); |
| } |
| |
| @Override |
| public LuhnChecksumValidator[] newArray(int size) { |
| return new LuhnChecksumValidator[size]; |
| } |
| }; |
| } |