biometrics/fingerprint/aidl/default/FakeFingerprintEngine.cpp - android_hardware_interfaces - Gitiles

 /*
  * Copyright (C) 2021 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.
  */

 #include "FakeFingerprintEngine.h"
 #include "Fingerprint.h"

 #include <android-base/logging.h>
 #include <android-base/parseint.h>

 #include <fingerprint.sysprop.h>

 #include "util/CancellationSignal.h"
 #include "util/Util.h"

 using namespace ::android::fingerprint::virt;
 using ::android::base::ParseInt;

 namespace aidl::android::hardware::biometrics::fingerprint {

 void FakeFingerprintEngine::generateChallengeImpl(ISessionCallback* cb) {
     BEGIN_OP(0);
     std::uniform_int_distribution<int64_t> dist;
     auto challenge = dist(mRandom);
     FingerprintHalProperties::challenge(challenge);
     cb->onChallengeGenerated(challenge);
 }

 void FakeFingerprintEngine::revokeChallengeImpl(ISessionCallback* cb, int64_t challenge) {
     BEGIN_OP(0);
     FingerprintHalProperties::challenge({});
     cb->onChallengeRevoked(challenge);
 }

 void FakeFingerprintEngine::enrollImpl(ISessionCallback* cb,
                                        const keymaster::HardwareAuthToken& hat,
                                        const std::future<void>& cancel) {
     BEGIN_OP(FingerprintHalProperties::operation_enroll_latency().value_or(DEFAULT_LATENCY));

     // Do proper HAT verification in the real implementation.
     if (hat.mac.empty()) {
         LOG(ERROR) << "Fail: hat";
         cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
         return;
     }

     // Force error-out
     auto err = FingerprintHalProperties::operation_enroll_error().value_or(0);
     if (err != 0) {
         LOG(ERROR) << "Fail: operation_enroll_error";
         auto ec = convertError(err);
         cb->onError(ec.first, ec.second);
         return;
     }

     // Format is "<id>:<progress_ms-[acquiredInfo..]>,...:<result>
     auto nextEnroll = FingerprintHalProperties::next_enrollment().value_or("");
     auto parts = Util::split(nextEnroll, ":");
     if (parts.size() != 3) {
         LOG(ERROR) << "Fail: invalid next_enrollment:" << nextEnroll;
         cb->onError(Error::VENDOR, 0 /* vendorError */);
         return;
     }
     auto enrollmentId = std::stoi(parts[0]);
     auto progress = parseEnrollmentCapture(parts[1]);
     for (size_t i = 0; i < progress.size(); i += 2) {
         auto left = (progress.size() - i) / 2 - 1;
         auto duration = progress[i][0];
         auto acquired = progress[i + 1];
         auto N = acquired.size();

         for (int j = 0; j < N; j++) {
             SLEEP_MS(duration / N);

             if (shouldCancel(cancel)) {
                 LOG(ERROR) << "Fail: cancel";
                 cb->onError(Error::CANCELED, 0 /* vendorCode */);
                 return;
             }
             auto ac = convertAcquiredInfo(acquired[j]);
             cb->onAcquired(ac.first, ac.second);
         }

         if (left == 0 && !IS_TRUE(parts[2])) {  // end and failed
             LOG(ERROR) << "Fail: requested by caller: " << nextEnroll;
             FingerprintHalProperties::next_enrollment({});
             cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorCode */);
         } else {  // progress and update props if last time
             LOG(INFO) << "onEnroll: " << enrollmentId << " left: " << left;
             if (left == 0) {
                 auto enrollments = FingerprintHalProperties::enrollments();
                 enrollments.emplace_back(enrollmentId);
                 FingerprintHalProperties::enrollments(enrollments);
                 FingerprintHalProperties::next_enrollment({});
                 // change authenticatorId after new enrollment
                 auto id = FingerprintHalProperties::authenticator_id().value_or(0);
                 auto newId = id + 1;
                 FingerprintHalProperties::authenticator_id(newId);
                 LOG(INFO) << "Enrolled: " << enrollmentId;
             }
             cb->onEnrollmentProgress(enrollmentId, left);
         }
     }
 }

 void FakeFingerprintEngine::authenticateImpl(ISessionCallback* cb, int64_t /* operationId */,
                                              const std::future<void>& cancel) {
     BEGIN_OP(FingerprintHalProperties::operation_authenticate_latency().value_or(DEFAULT_LATENCY));

     int64_t now = Util::getSystemNanoTime();
     int64_t duration = FingerprintHalProperties::operation_authenticate_duration().value_or(10);
     auto acquired = FingerprintHalProperties::operation_authenticate_acquired().value_or("1");
     auto acquiredInfos = parseIntSequence(acquired);
     int N = acquiredInfos.size();

     if (N == 0) {
         LOG(ERROR) << "Fail to parse authentiate acquired info: " + acquired;
         cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
         return;
     }

     int i = 0;
     do {
         if (FingerprintHalProperties::operation_authenticate_fails().value_or(false)) {
             LOG(ERROR) << "Fail: operation_authenticate_fails";
             cb->onAuthenticationFailed();
             return;
         }

         auto err = FingerprintHalProperties::operation_authenticate_error().value_or(0);
         if (err != 0) {
             LOG(ERROR) << "Fail: operation_authenticate_error";
             auto ec = convertError(err);
             cb->onError(ec.first, ec.second);
             return;
         }

         if (FingerprintHalProperties::lockout().value_or(false)) {
             LOG(ERROR) << "Fail: lockout";
             cb->onLockoutPermanent();
             cb->onError(Error::HW_UNAVAILABLE, 0 /* vendorError */);
             return;
         }

         if (shouldCancel(cancel)) {
             LOG(ERROR) << "Fail: cancel";
             cb->onError(Error::CANCELED, 0 /* vendorCode */);
             return;
         }

         if (i < N) {
             auto ac = convertAcquiredInfo(acquiredInfos[i]);
             cb->onAcquired(ac.first, ac.second);
             i++;
         }

         SLEEP_MS(duration / N);
     } while (!Util::hasElapsed(now, duration));

     auto id = FingerprintHalProperties::enrollment_hit().value_or(0);
     auto enrolls = FingerprintHalProperties::enrollments();
     auto isEnrolled = std::find(enrolls.begin(), enrolls.end(), id) != enrolls.end();
     if (id > 0 && isEnrolled) {
         cb->onAuthenticationSucceeded(id, {} /* hat */);
         return;
     } else {
         LOG(ERROR) << "Fail: fingerprint not enrolled";
         cb->onAuthenticationFailed();
     }
 }

 void FakeFingerprintEngine::detectInteractionImpl(ISessionCallback* cb,
                                                   const std::future<void>& cancel) {
     BEGIN_OP(FingerprintHalProperties::operation_detect_interaction_latency().value_or(
             DEFAULT_LATENCY));

     int64_t duration =
             FingerprintHalProperties::operation_detect_interaction_duration().value_or(10);
     auto acquired = FingerprintHalProperties::operation_detect_interaction_acquired().value_or("1");
     auto acquiredInfos = parseIntSequence(acquired);
     int N = acquiredInfos.size();
     int64_t now = Util::getSystemNanoTime();

     if (N == 0) {
         LOG(ERROR) << "Fail to parse detect interaction acquired info: " + acquired;
         cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
         return;
     }

     int i = 0;
     do {
         auto err = FingerprintHalProperties::operation_detect_interaction_error().value_or(0);
         if (err != 0) {
             LOG(ERROR) << "Fail: operation_detect_interaction_error";
             auto ec = convertError(err);
             cb->onError(ec.first, ec.second);
             return;
         }

         if (shouldCancel(cancel)) {
             LOG(ERROR) << "Fail: cancel";
             cb->onError(Error::CANCELED, 0 /* vendorCode */);
             return;
         }

         if (i < N) {
             auto ac = convertAcquiredInfo(acquiredInfos[i]);
             cb->onAcquired(ac.first, ac.second);
             i++;
         }
         SLEEP_MS(duration / N);
     } while (!Util::hasElapsed(now, duration));

     auto id = FingerprintHalProperties::enrollment_hit().value_or(0);
     auto enrolls = FingerprintHalProperties::enrollments();
     auto isEnrolled = std::find(enrolls.begin(), enrolls.end(), id) != enrolls.end();
     if (id <= 0 || !isEnrolled) {
         LOG(ERROR) << "Fail: not enrolled";
         cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
         return;
     }

     cb->onInteractionDetected();
 }

 void FakeFingerprintEngine::enumerateEnrollmentsImpl(ISessionCallback* cb) {
     BEGIN_OP(0);

     std::vector<int32_t> ids;
     // There are some enrollment sync issue with framework, which results in
     //  a single template removal during the very firt sync command after reboot.
     //  This is a workaround for now. TODO(b/243129174)
     ids.push_back(-1);

     for (auto& enrollment : FingerprintHalProperties::enrollments()) {
         auto id = enrollment.value_or(0);
         if (id > 0) {
             ids.push_back(id);
         }
     }

     cb->onEnrollmentsEnumerated(ids);
 }

 void FakeFingerprintEngine::removeEnrollmentsImpl(ISessionCallback* cb,
                                                   const std::vector<int32_t>& enrollmentIds) {
     BEGIN_OP(0);

     std::vector<std::optional<int32_t>> newEnrollments;
     std::vector<int32_t> removed;
     for (auto& enrollment : FingerprintHalProperties::enrollments()) {
         auto id = enrollment.value_or(0);
         if (std::find(enrollmentIds.begin(), enrollmentIds.end(), id) != enrollmentIds.end()) {
             removed.push_back(id);
         } else if (id > 0) {
             newEnrollments.emplace_back(id);
         }
     }
     FingerprintHalProperties::enrollments(newEnrollments);

     cb->onEnrollmentsRemoved(enrollmentIds);
 }

 void FakeFingerprintEngine::getAuthenticatorIdImpl(ISessionCallback* cb) {
     BEGIN_OP(0);
     int64_t authenticatorId;
     if (FingerprintHalProperties::enrollments().size() == 0) {
         authenticatorId = 0;
     } else {
         authenticatorId = FingerprintHalProperties::authenticator_id().value_or(0);
         if (authenticatorId == 0) authenticatorId = 1;
     }
     cb->onAuthenticatorIdRetrieved(authenticatorId);
 }

 void FakeFingerprintEngine::invalidateAuthenticatorIdImpl(ISessionCallback* cb) {
     BEGIN_OP(0);
     int64_t newId;
     if (FingerprintHalProperties::enrollments().size() == 0) {
         newId = 0;
     } else {
         auto id = FingerprintHalProperties::authenticator_id().value_or(0);
         newId = id + 1;
     }
     FingerprintHalProperties::authenticator_id(newId);
     cb->onAuthenticatorIdInvalidated(newId);
 }

 void FakeFingerprintEngine::resetLockoutImpl(ISessionCallback* cb,
                                              const keymaster::HardwareAuthToken& hat) {
     BEGIN_OP(0);
     if (hat.mac.empty()) {
         LOG(ERROR) << "Fail: hat in resetLockout()";
         cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
         return;
     }
     FingerprintHalProperties::lockout(false);
     cb->onLockoutCleared();
 }

 ndk::ScopedAStatus FakeFingerprintEngine::onPointerDownImpl(int32_t /*pointerId*/, int32_t /*x*/,
                                                             int32_t /*y*/, float /*minor*/,
                                                             float /*major*/) {
     BEGIN_OP(0);
     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus FakeFingerprintEngine::onPointerUpImpl(int32_t /*pointerId*/) {
     BEGIN_OP(0);
     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus FakeFingerprintEngine::onUiReadyImpl() {
     BEGIN_OP(0);
     return ndk::ScopedAStatus::ok();
 }

 bool FakeFingerprintEngine::getSensorLocationConfig(SensorLocation& out) {
     auto loc = FingerprintHalProperties::sensor_location().value_or("");
     auto isValidStr = false;
     auto dim = Util::split(loc, ":");

     if (dim.size() < 3 or dim.size() > 4) {
         if (!loc.empty()) LOG(WARNING) << "Invalid sensor location input (x:y:radius):" + loc;
         return false;
     } else {
         int32_t x, y, r;
         std::string d = "";
         if (dim.size() >= 3) {
             isValidStr = ParseInt(dim[0], &x) && ParseInt(dim[1], &y) && ParseInt(dim[2], &r);
         }
         if (dim.size() >= 4) {
             d = dim[3];
         }
         if (isValidStr) out = {0, x, y, r, d};

         return isValidStr;
     }
 }
 SensorLocation FakeFingerprintEngine::getSensorLocation() {
     SensorLocation location;

     if (getSensorLocationConfig(location)) {
         return location;
     } else {
         return defaultSensorLocation();
     }
 }

 SensorLocation FakeFingerprintEngine::defaultSensorLocation() {
     return {0 /* displayId (not used) */, 0 /* sensorLocationX */, 0 /* sensorLocationY */,
             0 /* sensorRadius */, "" /* display */};
 }

 std::vector<int32_t> FakeFingerprintEngine::parseIntSequence(const std::string& str,
                                                              const std::string& sep) {
     std::vector<std::string> seqs = Util::split(str, sep);
     std::vector<int32_t> res;

     for (const auto& seq : seqs) {
         int32_t val;
         if (ParseInt(seq, &val)) {
             res.push_back(val);
         } else {
             LOG(WARNING) << "Invalid int sequence:" + str;
             res.clear();
             break;
         }
     }

     return res;
 }

 std::vector<std::vector<int32_t>> FakeFingerprintEngine::parseEnrollmentCapture(
         const std::string& str) {
     std::vector<int32_t> defaultAcquiredInfo = {(int32_t)AcquiredInfo::GOOD};
     std::vector<std::vector<int32_t>> res;
     int i = 0, N = str.length();
     std::size_t found = 0;
     bool aborted = true;

     while (found != std::string::npos) {
         std::string durationStr, acquiredStr;
         found = str.find_first_of("-,", i);
         if (found == std::string::npos) {
             if (N - i < 1) break;
             durationStr = str.substr(i, N - i);
         } else {
             durationStr = str.substr(i, found - i);
             if (str[found] == '-') {
                 found = str.find_first_of('[', found + 1);
                 if (found == std::string::npos) break;
                 i = found + 1;
                 found = str.find_first_of(']', found + 1);
                 if (found == std::string::npos) break;
                 acquiredStr = str.substr(i, found - i);
                 found = str.find_first_of(',', found + 1);
             }
         }
         std::vector<int32_t> duration{0};
         if (!ParseInt(durationStr, &duration[0])) break;
         res.push_back(duration);
         if (!acquiredStr.empty()) {
             std::vector<int32_t> acquiredInfo = parseIntSequence(acquiredStr);
             if (acquiredInfo.empty()) break;
             res.push_back(acquiredInfo);
         } else
             res.push_back(defaultAcquiredInfo);

         i = found + 1;
         if (found == std::string::npos || found == N - 1) aborted = false;
     }

     if (aborted) {
         LOG(ERROR) << "Failed to parse enrollment captures:" + str;
         res.clear();
     }

     return res;
 }

 std::pair<AcquiredInfo, int32_t> FakeFingerprintEngine::convertAcquiredInfo(int32_t code) {
     std::pair<AcquiredInfo, int32_t> res;
     if (code > FINGERPRINT_ACQUIRED_VENDOR_BASE) {
         res.first = AcquiredInfo::VENDOR;
         res.second = code - FINGERPRINT_ACQUIRED_VENDOR_BASE;
     } else {
         res.first = (AcquiredInfo)code;
         res.second = 0;
     }
     return res;
 }

 std::pair<Error, int32_t> FakeFingerprintEngine::convertError(int32_t code) {
     std::pair<Error, int32_t> res;
     if (code > FINGERPRINT_ERROR_VENDOR_BASE) {
         res.first = Error::VENDOR;
         res.second = code - FINGERPRINT_ERROR_VENDOR_BASE;
     } else {
         res.first = (Error)code;
         res.second = 0;
     }
     return res;
 }

 }  // namespace aidl::android::hardware::biometrics::fingerprint
	/*
	* Copyright (C) 2021 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.
	*/

	#include "FakeFingerprintEngine.h"
	#include "Fingerprint.h"

	#include <android-base/logging.h>
	#include <android-base/parseint.h>

	#include <fingerprint.sysprop.h>

	#include "util/CancellationSignal.h"
	#include "util/Util.h"

	using namespace ::android::fingerprint::virt;
	using ::android::base::ParseInt;

	namespace aidl::android::hardware::biometrics::fingerprint {

	void FakeFingerprintEngine::generateChallengeImpl(ISessionCallback* cb) {
	BEGIN_OP(0);
	std::uniform_int_distribution<int64_t> dist;
	auto challenge = dist(mRandom);
	FingerprintHalProperties::challenge(challenge);
	cb->onChallengeGenerated(challenge);
	}

	void FakeFingerprintEngine::revokeChallengeImpl(ISessionCallback* cb, int64_t challenge) {
	BEGIN_OP(0);
	FingerprintHalProperties::challenge({});
	cb->onChallengeRevoked(challenge);
	}

	void FakeFingerprintEngine::enrollImpl(ISessionCallback* cb,
	const keymaster::HardwareAuthToken& hat,
	const std::future<void>& cancel) {
	BEGIN_OP(FingerprintHalProperties::operation_enroll_latency().value_or(DEFAULT_LATENCY));

	// Do proper HAT verification in the real implementation.
	if (hat.mac.empty()) {
	LOG(ERROR) << "Fail: hat";
	cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
	return;
	}

	// Force error-out
	auto err = FingerprintHalProperties::operation_enroll_error().value_or(0);
	if (err != 0) {
	LOG(ERROR) << "Fail: operation_enroll_error";
	auto ec = convertError(err);
	cb->onError(ec.first, ec.second);
	return;
	}

	// Format is "<id>:<progress_ms-[acquiredInfo..]>,...:<result>
	auto nextEnroll = FingerprintHalProperties::next_enrollment().value_or("");
	auto parts = Util::split(nextEnroll, ":");
	if (parts.size() != 3) {
	LOG(ERROR) << "Fail: invalid next_enrollment:" << nextEnroll;
	cb->onError(Error::VENDOR, 0 /* vendorError */);
	return;
	}
	auto enrollmentId = std::stoi(parts[0]);
	auto progress = parseEnrollmentCapture(parts[1]);
	for (size_t i = 0; i < progress.size(); i += 2) {
	auto left = (progress.size() - i) / 2 - 1;
	auto duration = progress[i][0];
	auto acquired = progress[i + 1];
	auto N = acquired.size();

	for (int j = 0; j < N; j++) {
	SLEEP_MS(duration / N);

	if (shouldCancel(cancel)) {
	LOG(ERROR) << "Fail: cancel";
	cb->onError(Error::CANCELED, 0 /* vendorCode */);
	return;
	}
	auto ac = convertAcquiredInfo(acquired[j]);
	cb->onAcquired(ac.first, ac.second);
	}

	if (left == 0 && !IS_TRUE(parts[2])) { // end and failed
	LOG(ERROR) << "Fail: requested by caller: " << nextEnroll;
	FingerprintHalProperties::next_enrollment({});
	cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorCode */);
	} else { // progress and update props if last time
	LOG(INFO) << "onEnroll: " << enrollmentId << " left: " << left;
	if (left == 0) {
	auto enrollments = FingerprintHalProperties::enrollments();
	enrollments.emplace_back(enrollmentId);
	FingerprintHalProperties::enrollments(enrollments);
	FingerprintHalProperties::next_enrollment({});
	// change authenticatorId after new enrollment
	auto id = FingerprintHalProperties::authenticator_id().value_or(0);
	auto newId = id + 1;
	FingerprintHalProperties::authenticator_id(newId);
	LOG(INFO) << "Enrolled: " << enrollmentId;
	}
	cb->onEnrollmentProgress(enrollmentId, left);
	}
	}
	}

	void FakeFingerprintEngine::authenticateImpl(ISessionCallback* cb, int64_t /* operationId */,
	const std::future<void>& cancel) {
	BEGIN_OP(FingerprintHalProperties::operation_authenticate_latency().value_or(DEFAULT_LATENCY));

	int64_t now = Util::getSystemNanoTime();
	int64_t duration = FingerprintHalProperties::operation_authenticate_duration().value_or(10);
	auto acquired = FingerprintHalProperties::operation_authenticate_acquired().value_or("1");
	auto acquiredInfos = parseIntSequence(acquired);
	int N = acquiredInfos.size();

	if (N == 0) {
	LOG(ERROR) << "Fail to parse authentiate acquired info: " + acquired;
	cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
	return;
	}

	int i = 0;
	do {
	if (FingerprintHalProperties::operation_authenticate_fails().value_or(false)) {
	LOG(ERROR) << "Fail: operation_authenticate_fails";
	cb->onAuthenticationFailed();
	return;
	}

	auto err = FingerprintHalProperties::operation_authenticate_error().value_or(0);
	if (err != 0) {
	LOG(ERROR) << "Fail: operation_authenticate_error";
	auto ec = convertError(err);
	cb->onError(ec.first, ec.second);
	return;
	}

	if (FingerprintHalProperties::lockout().value_or(false)) {
	LOG(ERROR) << "Fail: lockout";
	cb->onLockoutPermanent();
	cb->onError(Error::HW_UNAVAILABLE, 0 /* vendorError */);
	return;
	}

	if (shouldCancel(cancel)) {
	LOG(ERROR) << "Fail: cancel";
	cb->onError(Error::CANCELED, 0 /* vendorCode */);
	return;
	}

	if (i < N) {
	auto ac = convertAcquiredInfo(acquiredInfos[i]);
	cb->onAcquired(ac.first, ac.second);
	i++;
	}

	SLEEP_MS(duration / N);
	} while (!Util::hasElapsed(now, duration));

	auto id = FingerprintHalProperties::enrollment_hit().value_or(0);
	auto enrolls = FingerprintHalProperties::enrollments();
	auto isEnrolled = std::find(enrolls.begin(), enrolls.end(), id) != enrolls.end();
	if (id > 0 && isEnrolled) {
	cb->onAuthenticationSucceeded(id, {} /* hat */);
	return;
	} else {
	LOG(ERROR) << "Fail: fingerprint not enrolled";
	cb->onAuthenticationFailed();
	}
	}

	void FakeFingerprintEngine::detectInteractionImpl(ISessionCallback* cb,
	const std::future<void>& cancel) {
	BEGIN_OP(FingerprintHalProperties::operation_detect_interaction_latency().value_or(
	DEFAULT_LATENCY));

	int64_t duration =
	FingerprintHalProperties::operation_detect_interaction_duration().value_or(10);
	auto acquired = FingerprintHalProperties::operation_detect_interaction_acquired().value_or("1");
	auto acquiredInfos = parseIntSequence(acquired);
	int N = acquiredInfos.size();
	int64_t now = Util::getSystemNanoTime();

	if (N == 0) {
	LOG(ERROR) << "Fail to parse detect interaction acquired info: " + acquired;
	cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
	return;
	}

	int i = 0;
	do {
	auto err = FingerprintHalProperties::operation_detect_interaction_error().value_or(0);
	if (err != 0) {
	LOG(ERROR) << "Fail: operation_detect_interaction_error";
	auto ec = convertError(err);
	cb->onError(ec.first, ec.second);
	return;
	}

	if (shouldCancel(cancel)) {
	LOG(ERROR) << "Fail: cancel";
	cb->onError(Error::CANCELED, 0 /* vendorCode */);
	return;
	}

	if (i < N) {
	auto ac = convertAcquiredInfo(acquiredInfos[i]);
	cb->onAcquired(ac.first, ac.second);
	i++;
	}
	SLEEP_MS(duration / N);
	} while (!Util::hasElapsed(now, duration));

	auto id = FingerprintHalProperties::enrollment_hit().value_or(0);
	auto enrolls = FingerprintHalProperties::enrollments();
	auto isEnrolled = std::find(enrolls.begin(), enrolls.end(), id) != enrolls.end();
	if (id <= 0 \|\| !isEnrolled) {
	LOG(ERROR) << "Fail: not enrolled";
	cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
	return;
	}

	cb->onInteractionDetected();
	}

	void FakeFingerprintEngine::enumerateEnrollmentsImpl(ISessionCallback* cb) {
	BEGIN_OP(0);

	std::vector<int32_t> ids;
	// There are some enrollment sync issue with framework, which results in
	// a single template removal during the very firt sync command after reboot.
	// This is a workaround for now. TODO(b/243129174)
	ids.push_back(-1);

	for (auto& enrollment : FingerprintHalProperties::enrollments()) {
	auto id = enrollment.value_or(0);
	if (id > 0) {
	ids.push_back(id);
	}
	}

	cb->onEnrollmentsEnumerated(ids);
	}

	void FakeFingerprintEngine::removeEnrollmentsImpl(ISessionCallback* cb,
	const std::vector<int32_t>& enrollmentIds) {
	BEGIN_OP(0);

	std::vector<std::optional<int32_t>> newEnrollments;
	std::vector<int32_t> removed;
	for (auto& enrollment : FingerprintHalProperties::enrollments()) {
	auto id = enrollment.value_or(0);
	if (std::find(enrollmentIds.begin(), enrollmentIds.end(), id) != enrollmentIds.end()) {
	removed.push_back(id);
	} else if (id > 0) {
	newEnrollments.emplace_back(id);
	}
	}
	FingerprintHalProperties::enrollments(newEnrollments);

	cb->onEnrollmentsRemoved(enrollmentIds);
	}

	void FakeFingerprintEngine::getAuthenticatorIdImpl(ISessionCallback* cb) {
	BEGIN_OP(0);
	int64_t authenticatorId;
	if (FingerprintHalProperties::enrollments().size() == 0) {
	authenticatorId = 0;
	} else {
	authenticatorId = FingerprintHalProperties::authenticator_id().value_or(0);
	if (authenticatorId == 0) authenticatorId = 1;
	}
	cb->onAuthenticatorIdRetrieved(authenticatorId);
	}

	void FakeFingerprintEngine::invalidateAuthenticatorIdImpl(ISessionCallback* cb) {
	BEGIN_OP(0);
	int64_t newId;
	if (FingerprintHalProperties::enrollments().size() == 0) {
	newId = 0;
	} else {
	auto id = FingerprintHalProperties::authenticator_id().value_or(0);
	newId = id + 1;
	}
	FingerprintHalProperties::authenticator_id(newId);
	cb->onAuthenticatorIdInvalidated(newId);
	}

	void FakeFingerprintEngine::resetLockoutImpl(ISessionCallback* cb,
	const keymaster::HardwareAuthToken& hat) {
	BEGIN_OP(0);
	if (hat.mac.empty()) {
	LOG(ERROR) << "Fail: hat in resetLockout()";
	cb->onError(Error::UNABLE_TO_PROCESS, 0 /* vendorError */);
	return;
	}
	FingerprintHalProperties::lockout(false);
	cb->onLockoutCleared();
	}

	ndk::ScopedAStatus FakeFingerprintEngine::onPointerDownImpl(int32_t /pointerId/, int32_t /x/,
	int32_t /y/, float /minor/,
	float /major/) {
	BEGIN_OP(0);
	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus FakeFingerprintEngine::onPointerUpImpl(int32_t /pointerId/) {
	BEGIN_OP(0);
	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus FakeFingerprintEngine::onUiReadyImpl() {
	BEGIN_OP(0);
	return ndk::ScopedAStatus::ok();
	}

	bool FakeFingerprintEngine::getSensorLocationConfig(SensorLocation& out) {
	auto loc = FingerprintHalProperties::sensor_location().value_or("");
	auto isValidStr = false;
	auto dim = Util::split(loc, ":");

	if (dim.size() < 3 or dim.size() > 4) {
	if (!loc.empty()) LOG(WARNING) << "Invalid sensor location input (x:y:radius):" + loc;
	return false;
	} else {
	int32_t x, y, r;
	std::string d = "";
	if (dim.size() >= 3) {
	isValidStr = ParseInt(dim[0], &x) && ParseInt(dim[1], &y) && ParseInt(dim[2], &r);
	}
	if (dim.size() >= 4) {
	d = dim[3];
	}
	if (isValidStr) out = {0, x, y, r, d};

	return isValidStr;
	}
	}
	SensorLocation FakeFingerprintEngine::getSensorLocation() {
	SensorLocation location;

	if (getSensorLocationConfig(location)) {
	return location;
	} else {
	return defaultSensorLocation();
	}
	}

	SensorLocation FakeFingerprintEngine::defaultSensorLocation() {
	return {0 /* displayId (not used) /, 0 / sensorLocationX /, 0 / sensorLocationY */,
	0 /* sensorRadius /, "" / display */};
	}

	std::vector<int32_t> FakeFingerprintEngine::parseIntSequence(const std::string& str,
	const std::string& sep) {
	std::vector<std::string> seqs = Util::split(str, sep);
	std::vector<int32_t> res;

	for (const auto& seq : seqs) {
	int32_t val;
	if (ParseInt(seq, &val)) {
	res.push_back(val);
	} else {
	LOG(WARNING) << "Invalid int sequence:" + str;
	res.clear();
	break;
	}
	}

	return res;
	}

	std::vector<std::vector<int32_t>> FakeFingerprintEngine::parseEnrollmentCapture(
	const std::string& str) {
	std::vector<int32_t> defaultAcquiredInfo = {(int32_t)AcquiredInfo::GOOD};
	std::vector<std::vector<int32_t>> res;
	int i = 0, N = str.length();
	std::size_t found = 0;
	bool aborted = true;

	while (found != std::string::npos) {
	std::string durationStr, acquiredStr;
	found = str.find_first_of("-,", i);
	if (found == std::string::npos) {
	if (N - i < 1) break;
	durationStr = str.substr(i, N - i);
	} else {
	durationStr = str.substr(i, found - i);
	if (str[found] == '-') {
	found = str.find_first_of('[', found + 1);
	if (found == std::string::npos) break;
	i = found + 1;
	found = str.find_first_of(']', found + 1);
	if (found == std::string::npos) break;
	acquiredStr = str.substr(i, found - i);
	found = str.find_first_of(',', found + 1);
	}
	}
	std::vector<int32_t> duration{0};
	if (!ParseInt(durationStr, &duration[0])) break;
	res.push_back(duration);
	if (!acquiredStr.empty()) {
	std::vector<int32_t> acquiredInfo = parseIntSequence(acquiredStr);
	if (acquiredInfo.empty()) break;
	res.push_back(acquiredInfo);
	} else
	res.push_back(defaultAcquiredInfo);

	i = found + 1;
	if (found == std::string::npos \|\| found == N - 1) aborted = false;
	}

	if (aborted) {
	LOG(ERROR) << "Failed to parse enrollment captures:" + str;
	res.clear();
	}

	return res;
	}

	std::pair<AcquiredInfo, int32_t> FakeFingerprintEngine::convertAcquiredInfo(int32_t code) {
	std::pair<AcquiredInfo, int32_t> res;
	if (code > FINGERPRINT_ACQUIRED_VENDOR_BASE) {
	res.first = AcquiredInfo::VENDOR;
	res.second = code - FINGERPRINT_ACQUIRED_VENDOR_BASE;
	} else {
	res.first = (AcquiredInfo)code;
	res.second = 0;
	}
	return res;
	}

	std::pair<Error, int32_t> FakeFingerprintEngine::convertError(int32_t code) {
	std::pair<Error, int32_t> res;
	if (code > FINGERPRINT_ERROR_VENDOR_BASE) {
	res.first = Error::VENDOR;
	res.second = code - FINGERPRINT_ERROR_VENDOR_BASE;
	} else {
	res.first = (Error)code;
	res.second = 0;
	}
	return res;
	}

	} // namespace aidl::android::hardware::biometrics::fingerprint