cros: Added a fake fingerprint storage class.

chromeos/dbus/biod/fake_biod_client.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/dbus/biod/fake_biod_client.h"
 
 #include "base/bind.h"
+#include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "dbus/object_path.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
 
+namespace {
+
+// Path of an enroll session. There should only be one enroll session at a
+// given time.
+const char kEnrollSessionObjectPath[] = "/EnrollSession/";
+
+// Header of the path of an record. A unique number will be appended when an
+// record is created.
+const char kRecordObjectPathPrefix[] = "/Record/";
+
+// Path of an auth session. There should only be one auth sesion at a given
+// time.
+const char kAuthSessionObjectPath[] = "/AuthSession/";
+
+}  // namespace
+
+// FakeRecord is the definition of a fake stored fingerprint template.
+struct FakeRecord {
+  std::string user_id;
+  std::string label;
+  // A fake fingerprint is a vector which consists of all the strings which
+  // were "pressed" during the enroll session.
+  std::vector<std::string> fake_fingerprint;
+};
+
 FakeBiodClient::FakeBiodClient() {}
 
 FakeBiodClient::~FakeBiodClient() {}
 
-void FakeBiodClient::SendEnrollScanDone(biod::ScanResult type_result,
+void FakeBiodClient::SendEnrollScanDone(const std::string& fingerprint,
+                                        biod::ScanResult type_result,
                                         bool is_complete) {
+  // Enroll scan signals do nothing if an enroll session is not happening.
+  if (current_session_ != FingerprintSession::ENROLL)
+    return;
+
+  DCHECK(current_record_);
+  // The fake fingerprint gets appended to the current fake fingerprints.
+  current_record_->fake_fingerprint.push_back(fingerprint);
+
+  // If the enroll is complete, save the record and exit enroll mode.
+  if (is_complete) {
+    records_[current_record_path_] = std::move(current_record_);
+    current_record_path_ = dbus::ObjectPath();
+    current_record_.reset();
+    current_session_ = FingerprintSession::NONE;
+  }
+
   for (auto& observer : observers_)
     observer.BiodEnrollScanDoneReceived(type_result, is_complete);
 }
 
-void FakeBiodClient::SendAuthScanDone(biod::ScanResult type_result,
-                                      const AuthScanMatches& matches) {
+void FakeBiodClient::SendAuthScanDone(const std::string& fingerprint,
+                                      biod::ScanResult type_result) {
+  // Auth scan signals do nothing if an auth session is not happening.
+  if (current_session_ != FingerprintSession::AUTH)
+    return;
+
+  AuthScanMatches matches;
+  // Iterate through all the records to check if fingerprint is a match and
+  // populate |matches| accordingly. This searches through all the records and
+  // then each record's fake fingerprint, but neither of these should ever have
+  // more than five entries.
+  for (const auto& entry : records_) {
+    const auto& record = entry.second;

[Daniel Erat, 2017/04/11 18:45:21]

nit: instead of 'auto', explicitly give the type here since it's not
self-documenting from the context

[sammiequon, 2017/04/11 18:55:19]

Done.

+    if (std::find(record->fake_fingerprint.begin(),
+                  record->fake_fingerprint.end(),
+                  fingerprint) != record->fake_fingerprint.end()) {
+      const std::string& user_id = record->user_id;
+      matches[user_id].push_back(record->label);
+    }
+  }
+
   for (auto& observer : observers_)
     observer.BiodAuthScanDoneReceived(type_result, matches);
 }
 
 void FakeBiodClient::SendSessionFailed() {
+  if (current_session_ == FingerprintSession::NONE)
+    return;
+
   for (auto& observer : observers_)
     observer.BiodSessionFailedReceived();
 }
 
+void FakeBiodClient::Reset() {
+  records_.clear();
+  current_record_.reset();
+  current_record_path_ = dbus::ObjectPath();
+  current_session_ = FingerprintSession::NONE;
+}
+
 void FakeBiodClient::Init(dbus::Bus* bus) {}
 
 void FakeBiodClient::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void FakeBiodClient::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 bool FakeBiodClient::HasObserver(const Observer* observer) const {
   return observers_.HasObserver(observer);
 }
 
-void FakeBiodClient::StartEnrollSession(const std::string& /* user_id */,
-                                        const std::string& /* label */,
+void FakeBiodClient::StartEnrollSession(const std::string& user_id,
+                                        const std::string& label,
                                         const ObjectPathCallback& callback) {
+  DCHECK_EQ(current_session_, FingerprintSession::NONE);
+
+  // Create the enrollment with |user_id|, |label| and a empty fake fingerprint.
+  current_record_path_ = dbus::ObjectPath(
+      kRecordObjectPathPrefix + std::to_string(next_record_unique_id_++));
+  current_record_ = base::MakeUnique<FakeRecord>();
+  current_record_->user_id = user_id;
+  current_record_->label = label;
+  current_session_ = FingerprintSession::ENROLL;
+
   base::ThreadTaskRunnerHandle::Get()->PostTask(
-      FROM_HERE, base::Bind(callback, dbus::ObjectPath()));
+      FROM_HERE,
+      base::Bind(callback, dbus::ObjectPath(kEnrollSessionObjectPath)));
 }
 
-void FakeBiodClient::GetRecordsForUser(const std::string& /* user_id */,
+void FakeBiodClient::GetRecordsForUser(const std::string& user_id,
                                        const UserRecordsCallback& callback) {
+  std::vector<dbus::ObjectPath> records_object_paths;
+  for (const auto& record : records_) {
+    if (record.second->user_id == user_id)
+      records_object_paths.push_back(record.first);
+  }
+
   base::ThreadTaskRunnerHandle::Get()->PostTask(
-      FROM_HERE, base::Bind(callback, std::vector<dbus::ObjectPath>()));
+      FROM_HERE, base::Bind(callback, records_object_paths));
 }
 
 void FakeBiodClient::DestroyAllRecords(const VoidDBusMethodCallback& callback) {
+  records_.clear();
+
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS));
 }
 
 void FakeBiodClient::StartAuthSession(const ObjectPathCallback& callback) {
+  DCHECK_EQ(current_session_, FingerprintSession::NONE);
+
+  current_session_ = FingerprintSession::AUTH;
   base::ThreadTaskRunnerHandle::Get()->PostTask(
-      FROM_HERE, base::Bind(callback, dbus::ObjectPath()));
+      FROM_HERE,
+      base::Bind(callback, dbus::ObjectPath(kAuthSessionObjectPath)));
 }
 
 void FakeBiodClient::RequestType(const BiometricTypeCallback& callback) {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
-      base::Bind(callback, biod::BiometricType::BIOMETRIC_TYPE_UNKNOWN));
+      base::Bind(callback, biod::BiometricType::BIOMETRIC_TYPE_FINGERPRINT));
 }
 
 void FakeBiodClient::CancelEnrollSession(
-    const dbus::ObjectPath& /* enroll_session_path */,
+    const dbus::ObjectPath& enroll_session_path,
     const VoidDBusMethodCallback& callback) {
+  DCHECK_EQ(current_session_, FingerprintSession::ENROLL);
+  DCHECK_EQ(enroll_session_path.value(), kEnrollSessionObjectPath);
+
+  // Clean up the in progress enrollment.
+  current_record_.reset();
+  current_record_path_ = dbus::ObjectPath();
+  current_session_ = FingerprintSession::NONE;
+
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS));
 }
 
-void FakeBiodClient::EndAuthSession(
-    const dbus::ObjectPath& /* auth_session_path */,
-    const VoidDBusMethodCallback& callback) {
+void FakeBiodClient::EndAuthSession(const dbus::ObjectPath& auth_session_path,
+                                    const VoidDBusMethodCallback& callback) {
+  DCHECK_EQ(current_session_, FingerprintSession::AUTH);
+  DCHECK_EQ(auth_session_path.value(), kAuthSessionObjectPath);
+
+  current_session_ = FingerprintSession::NONE;
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS));
 }
 
-void FakeBiodClient::SetRecordLabel(const dbus::ObjectPath& /* record_path */,
-                                    const std::string& /* label */,
+void FakeBiodClient::SetRecordLabel(const dbus::ObjectPath& record_path,
+                                    const std::string& label,
                                     const VoidDBusMethodCallback& callback) {
+  if (records_.find(record_path) != records_.end())
+    records_[record_path]->label = label;
+
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS));
 }
 
-void FakeBiodClient::RemoveRecord(const dbus::ObjectPath& /* record_path */,
+void FakeBiodClient::RemoveRecord(const dbus::ObjectPath& record_path,
                                   const VoidDBusMethodCallback& callback) {
+  records_.erase(record_path);
+
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS));
 }
 
-void FakeBiodClient::RequestRecordLabel(
-    const dbus::ObjectPath& /* record_path */,
-    const LabelCallback& callback) {
-  base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
-                                                base::Bind(callback, ""));
+void FakeBiodClient::RequestRecordLabel(const dbus::ObjectPath& record_path,
+                                        const LabelCallback& callback) {
+  std::string record_label;
+  if (records_.find(record_path) != records_.end())
+    record_label = records_[record_path]->label;
+
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(callback, record_label));
 }
 
 }  // namespace chromeos