cros: DBUS client to interact with fingerprint DBUS API.

chromeos/dbus/biod_biometrics_manager_client.h

Index: chromeos/dbus/biod_biometrics_manager_client.h
diff --git a/chromeos/dbus/biod_biometrics_manager_client.h b/chromeos/dbus/biod_biometrics_manager_client.h
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+++ b/chromeos/dbus/biod_biometrics_manager_client.h
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+// 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.
+
+#ifndef CHROMEOS_DBUS_BIOD_BIOMETRICS_MANAGER_CLIENT_H_
+#define CHROMEOS_DBUS_BIOD_BIOMETRICS_MANAGER_CLIENT_H_
+
+#include <stdint.h>
+
+#include <unordered_map>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/dbus/dbus_client.h"
+#include "chromeos/dbus/dbus_client_implementation_type.h"
+#include "chromeos/dbus/dbus_method_call_status.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace chromeos {
+
+// Each time the sensor detects a scan, an object containing all the users, each
+// with the labels of all the matched stored fingerprints is returned.
+using AuthScanMatches =
+    std::unordered_map<std::string, std::vector<std::string>>;
+
+// BiodBiometricsManagerClient is used to communicate with the biod dbus
+// interface.
+class CHROMEOS_EXPORT BiodBiometricsManagerClient : public DBusClient {
+ public:
+  // Interface for observing changes from the biometrics.
+  class Observer {
+   public:
+    // Called when biometrics manager powers up or is restarted.
+    virtual void ClientRestarted() {}
+
+    // Called whenever a user attempts a scan. |scan_result| tells whether the
+    // scan was succesful. |is_complete| tells whether enrollment is complete
+    // and now over.
+    virtual void EnrollScanDoneReceived(uint32_t scan_result,
+                                        bool is_complete) {}
+
+    // Called to indicate a bad scan of any kind, or a succesful scan. If scan
+    // is successful, |matches| will equal all the enrollment IDs that match the
+    // scan, and the labels of the matched fingeprints.
+    virtual void AuthScanDoneReceived(uint32_t scan_result,
+                                      const AuthScanMatches& matches) {}
+
+    // Called during either mode to indicate a failure. Any enrollment that was
+    // underway is thrown away and authentication will no longer be happening.
+    virtual void ScanFailedReceived() {}
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  ~BiodBiometricsManagerClient() override;
+
+  // Adds and removes the observer.
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+  // Returns true if this object has the given observer.
+  virtual bool HasObserver(const Observer* observer) const = 0;
+
+  // ObjectPathArrayCallback is used for the GetRecordsForUser method. It
+  // receives one argument which contains a list of the stored records object
+  // paths for a given user.
+  using ObjectPathArrayCallback =
+      base::Callback<void(const std::vector<dbus::ObjectPath>&)>;
+
+  // BiometricTypeCallback is used for the GetType method. It receives
+  // one argument which states the type of biometric.
+  using BiometricTypeCallback = base::Callback<void(biod::BiometricType)>;
+
+  // Starts the biometric enroll session.
+  virtual void StartEnrollSession(const std::string& user_id,
+                                  const std::string& label,
+                                  const ObjectPathCallback& callback) = 0;
+
+  // Gets all the records registered with this biometric.
+  virtual void GetRecordsForUser(const std::string& user_id,
+                                 const ObjectPathArrayCallback& callback) = 0;
+
+  // Irreversibly destroys all records registered with this biometric.
+  virtual void DestroyAllRecords() = 0;
+
+  // Starts the biometric authentication session.
+  virtual void StartAuthSession(const ObjectPathCallback& callback) = 0;
+
+  // Gets the type of biometric.
+  virtual void GetType(const BiometricTypeCallback& callback) = 0;
+
+  // Same as above but is synchronous.
+  virtual biod::BiometricType GetTypeBlocking() = 0;
+
+  // Creates the instance.
+  static BiodBiometricsManagerClient* Create(DBusClientImplementationType type);
+
+ protected:
+  friend class BiodBiometricsManagerClientTest;
+
+  // Create() should be used instead.
+  BiodBiometricsManagerClient();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BiodBiometricsManagerClient);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_BIOD_BIOMETRICS_MANAGER_CLIENT_H_