| /* |
| * Copyright (C) 2022 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.nearby; |
| |
| import android.annotation.NonNull; |
| import android.annotation.SystemApi; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| |
| import com.android.internal.util.Preconditions; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Represents a private credential. |
| * |
| * @hide |
| */ |
| @SystemApi |
| public final class PrivateCredential extends PresenceCredential implements Parcelable { |
| |
| @NonNull |
| public static final Creator<PrivateCredential> CREATOR = new Creator<PrivateCredential>() { |
| @Override |
| public PrivateCredential createFromParcel(Parcel in) { |
| in.readInt(); // Skip the type as it's used by parent class only. |
| return createFromParcelBody(in); |
| } |
| |
| @Override |
| public PrivateCredential[] newArray(int size) { |
| return new PrivateCredential[size]; |
| } |
| }; |
| |
| private byte[] mMetadataEncryptionKey; |
| private String mDeviceName; |
| |
| private PrivateCredential(Parcel in) { |
| super(CREDENTIAL_TYPE_PRIVATE, in); |
| mMetadataEncryptionKey = new byte[in.readInt()]; |
| in.readByteArray(mMetadataEncryptionKey); |
| mDeviceName = in.readString(); |
| } |
| |
| private PrivateCredential(int identityType, byte[] secretId, |
| String deviceName, byte[] authenticityKey, List<CredentialElement> credentialElements, |
| byte[] metadataEncryptionKey) { |
| super(CREDENTIAL_TYPE_PRIVATE, identityType, secretId, authenticityKey, |
| credentialElements); |
| mDeviceName = deviceName; |
| mMetadataEncryptionKey = metadataEncryptionKey; |
| } |
| |
| static PrivateCredential createFromParcelBody(Parcel in) { |
| return new PrivateCredential(in); |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(@NonNull Parcel dest, int flags) { |
| super.writeToParcel(dest, flags); |
| dest.writeInt(mMetadataEncryptionKey.length); |
| dest.writeByteArray(mMetadataEncryptionKey); |
| dest.writeString(mDeviceName); |
| } |
| |
| /** |
| * Returns the metadata encryption key associated with this credential. |
| */ |
| @NonNull |
| public byte[] getMetadataEncryptionKey() { |
| return mMetadataEncryptionKey; |
| } |
| |
| /** |
| * Returns the device name associated with this credential. |
| */ |
| @NonNull |
| public String getDeviceName() { |
| return mDeviceName; |
| } |
| |
| /** |
| * Builder class for {@link PresenceCredential}. |
| */ |
| public static final class Builder { |
| private final List<CredentialElement> mCredentialElements; |
| |
| private @IdentityType int mIdentityType; |
| private final byte[] mSecretId; |
| private final byte[] mAuthenticityKey; |
| private final byte[] mMetadataEncryptionKey; |
| private final String mDeviceName; |
| |
| public Builder(@NonNull byte[] secretId, @NonNull byte[] authenticityKey, |
| @NonNull byte[] metadataEncryptionKey, @NonNull String deviceName) { |
| Preconditions.checkState(secretId != null && secretId.length > 0, |
| "secret id cannot be empty"); |
| Preconditions.checkState(authenticityKey != null && authenticityKey.length > 0, |
| "authenticity key cannot be empty"); |
| Preconditions.checkState( |
| metadataEncryptionKey != null && metadataEncryptionKey.length > 0, |
| "metadataEncryptionKey cannot be empty"); |
| Preconditions.checkState(deviceName != null && deviceName.length() > 0, |
| "deviceName cannot be empty"); |
| mSecretId = secretId; |
| mAuthenticityKey = authenticityKey; |
| mMetadataEncryptionKey = metadataEncryptionKey; |
| mDeviceName = deviceName; |
| mCredentialElements = new ArrayList<>(); |
| } |
| |
| /** |
| * Sets the identity type for the presence credential. |
| */ |
| @NonNull |
| public Builder setIdentityType(@IdentityType int identityType) { |
| mIdentityType = identityType; |
| return this; |
| } |
| |
| /** |
| * Adds an element to the credential. |
| */ |
| @NonNull |
| public Builder addCredentialElement(@NonNull CredentialElement credentialElement) { |
| mCredentialElements.add(credentialElement); |
| return this; |
| } |
| |
| /** |
| * Builds the {@link PresenceCredential}. |
| */ |
| @NonNull |
| public PrivateCredential build() { |
| return new PrivateCredential(mIdentityType, mSecretId, mDeviceName, |
| mAuthenticityKey, mCredentialElements, mMetadataEncryptionKey); |
| } |
| |
| } |
| } |