biometrics/face/1.0/IBiometricsFaceClientCallback.hal

/*
 * 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.hardware.biometrics.face@1.0;

/**
 * This callback interface is used by clients to recieve updates from the face
 * HAL.
 */
interface IBiometricsFaceClientCallback {

    /**
     * A callback invoked when one enrollment step has been completed.
     *
     * @param deviceId A unique id associated with the HAL implementation
     *     service that processed this enrollment step.
     * @param faceId The id of the face template being enrolled.
     * @param userId The active user id for the template being enrolled.
     * @param remaining The number of remaining steps before enrolllment is
     *     complete or 0 if enrollment has completed successfully.
     */
    oneway onEnrollResult(uint64_t deviceId, uint32_t faceId, int32_t userId,
        uint32_t remaining);

    /**
     * A callback invoked when a face has been successfully authenticated.
     *
     * @param deviceId A unique id associated with the HAL implementation
     *     service that processed this autentication attempt.
     * @param faceId The id of the face template that passed the authentication
     *     challenge.
     * @param userId The active user id for the authenticated face.
     * @param token The hardware authentication token associated with this
     *     authenticate operation.
     */
    oneway onAuthenticated(uint64_t deviceId, uint32_t faceId, int32_t userId,
        vec<uint8_t> token);

    /**
     * A callback invoked when a face is acquired.
     *
     * If a non-critical, recoverable error occurs during an enrollment or
     * authentication attempt, the HAL implementation must invoke this callback
     * to allow clients to inform the user that some actionable change must be
     * made.
     *
     * @param deviceId A unique id associated with the HAL implementation
     *     service that acquired a face.
     * @param userId The id of the active user associated with the attempted
     *     face acquisition.
     * @param acquiredInfo A message about the quality of the acquired image.
     * @param vendorCode An optional vendor-specific message. This is only valid
     *     when acquiredInfo == FaceAcquiredInfo.VENDOR. This message is opaque
     *     to the framework, and vendors must provide code to handle it. For
     *     example this can be used to guide enrollment in Settings or provide
     *     a message during authentication that is vendor-specific. The vendor
     *     is expected to provide help strings to cover all known values.
     */
     oneway onAcquired(uint64_t deviceId, int32_t userId,
         FaceAcquiredInfo acquiredInfo, int32_t vendorCode);

    /**
     * A callback invoked when an error has occured.
     *
     * @param deviceId A unique id associated with the HAL implementation
     *     service where this error occured.
     * @param userId The id of the active user when the error occured, or
     *     UserHandle::NONE if an active user had not been set yet.
     * @param error A message about the error that occurred.
     * @param vendorCode An optional, vendor-speicifc error message. Only valid
     *     when error == FaceError.VENDOR. This message is opaque to the
     *     framework, and vendors must provide code to handle it. For example,
     *     this scan be used to show the user an error message specific to the
     *     device. The vendor is expected to provide error strings to cover
     *     all known values.
     */
    oneway onError(uint64_t deviceId, int32_t userId, FaceError error,
        int32_t vendorCode);

    /**
     * A callback invoked when a face template has been removed.
     *
     * @param deviceId A unique id associated with the HAL implementation
     *     service that processed this removal.
     * @param faceId The id of the face template that was removed.
     * @param userId The active user id for the removed face template.
     * @param remaining The number of face templates remaining after this
     *     removal, or 0 if there are no more.
     */
    oneway onRemoved(uint64_t deviceId, uint32_t faceId, int32_t userId,
        uint32_t remaining);

    /**
     * A callback invoked to enumerate all current face templates.
     *
     * @param deviceId A unique id associated with the HAL implementation
     *     service that processed this enumeration.
     * @param faceIds A list of ids of all currently enrolled face templates.
     * @param userId The active user id for the enumerated face template.
     */
    oneway onEnumerate(uint64_t deviceId, vec<uint32_t> faceIds,
        int32_t userId);
};