Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame^] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_ |
| 6 | #define DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_ |
| 7 | |
| 8 | #include <string> |
| 9 | #include <vector> |
| 10 | |
| 11 | #include "base/callback.h" |
| 12 | #include "base/string16.h" |
| 13 | #include "base/memory/ref_counted.h" |
| 14 | |
| 15 | namespace device { |
| 16 | |
| 17 | class BluetoothServiceRecord; |
| 18 | class BluetoothSocket; |
| 19 | |
| 20 | struct BluetoothOutOfBandPairingData; |
| 21 | |
| 22 | // BluetoothDevice represents a remote Bluetooth device, both its properties and |
| 23 | // capabilities as discovered by a local adapter and actions that may be |
| 24 | // performed on the remove device such as pairing, connection and disconnection. |
| 25 | // |
| 26 | // The class is instantiated and managed by the BluetoothAdapter class |
| 27 | // and pointers should only be obtained from that class and not cached, |
| 28 | // instead use the address() method as a unique key for a device. |
| 29 | // |
| 30 | // Since the lifecycle of BluetoothDevice instances is managed by |
| 31 | // BluetoothAdapter, that class rather than this provides observer methods |
| 32 | // for devices coming and going, as well as properties being updated. |
| 33 | class BluetoothDevice { |
| 34 | public: |
| 35 | // Possible values that may be returned by GetDeviceType(), representing |
| 36 | // different types of bluetooth device that we support or are aware of |
| 37 | // decoded from the bluetooth class information. |
| 38 | enum DeviceType { |
| 39 | DEVICE_UNKNOWN, |
| 40 | DEVICE_COMPUTER, |
| 41 | DEVICE_PHONE, |
| 42 | DEVICE_MODEM, |
| 43 | DEVICE_AUDIO, |
| 44 | DEVICE_CAR_AUDIO, |
| 45 | DEVICE_VIDEO, |
| 46 | DEVICE_PERIPHERAL, |
| 47 | DEVICE_JOYSTICK, |
| 48 | DEVICE_GAMEPAD, |
| 49 | DEVICE_KEYBOARD, |
| 50 | DEVICE_MOUSE, |
| 51 | DEVICE_TABLET, |
| 52 | DEVICE_KEYBOARD_MOUSE_COMBO |
| 53 | }; |
| 54 | |
| 55 | // Interface for observing changes from bluetooth devices. |
| 56 | class Observer { |
| 57 | public: |
| 58 | virtual ~Observer() {} |
| 59 | |
| 60 | // TODO(keybuk): add observers for pairing and connection. |
| 61 | }; |
| 62 | |
| 63 | // Interface for negotiating pairing of bluetooth devices. |
| 64 | class PairingDelegate { |
| 65 | public: |
| 66 | virtual ~PairingDelegate() {} |
| 67 | |
| 68 | // This method will be called when the Bluetooth daemon requires a |
| 69 | // PIN Code for authentication of the device |device|, the delegate should |
| 70 | // obtain the code from the user and call SetPinCode() on the device to |
| 71 | // provide it, or RejectPairing() or CancelPairing() to reject or cancel |
| 72 | // the request. |
| 73 | // |
| 74 | // PIN Codes are generally required for Bluetooth 2.0 and earlier devices |
| 75 | // for which there is no automatic pairing or special handling. |
| 76 | virtual void RequestPinCode(BluetoothDevice* device) = 0; |
| 77 | |
| 78 | // This method will be called when the Bluetooth daemon requires a |
| 79 | // Passkey for authentication of the device |device|, the delegate should |
| 80 | // obtain the passkey from the user (a numeric in the range 0-999999) and |
| 81 | // call SetPasskey() on the device to provide it, or RejectPairing() or |
| 82 | // CancelPairing() to reject or cancel the request. |
| 83 | // |
| 84 | // Passkeys are generally required for Bluetooth 2.1 and later devices |
| 85 | // which cannot provide input or display on their own, and don't accept |
| 86 | // passkey-less pairing. |
| 87 | virtual void RequestPasskey(BluetoothDevice* device) = 0; |
| 88 | |
| 89 | // This method will be called when the Bluetooth daemon requires that the |
| 90 | // user enter the PIN code |pincode| into the device |device| so that it |
| 91 | // may be authenticated. The DismissDisplayOrConfirm() method |
| 92 | // will be called to dismiss the display once pairing is complete or |
| 93 | // cancelled. |
| 94 | // |
| 95 | // This is used for Bluetooth 2.0 and earlier keyboard devices, the |
| 96 | // |pincode| will always be a six-digit numeric in the range 000000-999999 |
| 97 | // for compatibilty with later specifications. |
| 98 | virtual void DisplayPinCode(BluetoothDevice* device, |
| 99 | const std::string& pincode) = 0; |
| 100 | |
| 101 | // This method will be called when the Bluetooth daemon requires that the |
| 102 | // user enter the Passkey |passkey| into the device |device| so that it |
| 103 | // may be authenticated. The DismissDisplayOrConfirm() method will be |
| 104 | // called to dismiss the display once pairing is complete or cancelled. |
| 105 | // |
| 106 | // This is used for Bluetooth 2.1 and later devices that support input |
| 107 | // but not display, such as keyboards. The Passkey is a numeric in the |
| 108 | // range 0-999999 and should be always presented zero-padded to six |
| 109 | // digits. |
| 110 | virtual void DisplayPasskey(BluetoothDevice* device, |
| 111 | uint32 passkey) = 0; |
| 112 | |
| 113 | // This method will be called when the Bluetooth daemon requires that the |
| 114 | // user confirm that the Passkey |passkey| is displayed on the screen |
| 115 | // of the device |device| so that it may be authenticated. The delegate |
| 116 | // should display to the user and ask for confirmation, then call |
| 117 | // ConfirmPairing() on the device to confirm, RejectPairing() on the device |
| 118 | // to reject or CancelPairing() on the device to cancel authentication |
| 119 | // for any other reason. |
| 120 | // |
| 121 | // This is used for Bluetooth 2.1 and later devices that support display, |
| 122 | // such as other computers or phones. The Passkey is a numeric in the |
| 123 | // range 0-999999 and should be always present zero-padded to six |
| 124 | // digits. |
| 125 | virtual void ConfirmPasskey(BluetoothDevice* device, |
| 126 | uint32 passkey) = 0; |
| 127 | |
| 128 | // This method will be called when any previous DisplayPinCode(), |
| 129 | // DisplayPasskey() or ConfirmPasskey() request should be concluded |
| 130 | // and removed from the user. |
| 131 | virtual void DismissDisplayOrConfirm() = 0; |
| 132 | }; |
| 133 | |
| 134 | virtual ~BluetoothDevice(); |
| 135 | |
| 136 | // Returns the Bluetooth of address the device. This should be used as |
| 137 | // a unique key to identify the device and copied where needed. |
| 138 | virtual const std::string& address() const; |
| 139 | |
| 140 | // Returns the name of the device suitable for displaying, this may |
| 141 | // be a synthesied string containing the address and localized type name |
| 142 | // if the device has no obtained name. |
| 143 | virtual string16 GetName() const; |
| 144 | |
| 145 | // Returns the type of the device, limited to those we support or are |
| 146 | // aware of, by decoding the bluetooth class information. The returned |
| 147 | // values are unique, and do not overlap, so DEVICE_KEYBOARD is not also |
| 148 | // DEVICE_PERIPHERAL. |
| 149 | DeviceType GetDeviceType() const; |
| 150 | |
| 151 | // Indicates whether the device is paired to the adapter, whether or not |
| 152 | // that pairing is permanent or temporary. |
| 153 | virtual bool IsPaired() const = 0; |
| 154 | |
| 155 | // Indicates whether the device is visible to the adapter, this is not |
| 156 | // mutually exclusive to being paired. |
| 157 | virtual bool IsVisible() const; |
| 158 | |
| 159 | // Indicates whether the device is bonded to the adapter, bonding is |
| 160 | // formed by pairing and exchanging high-security link keys so that |
| 161 | // connections may be encrypted. |
| 162 | virtual bool IsBonded() const; |
| 163 | |
| 164 | // Indicates whether the device is currently connected to the adapter |
| 165 | // and at least one service available for use. |
| 166 | virtual bool IsConnected() const; |
| 167 | |
| 168 | // Returns the services (as UUID strings) that this device provides. |
| 169 | typedef std::vector<std::string> ServiceList; |
| 170 | virtual const ServiceList& GetServices() const = 0; |
| 171 | |
| 172 | // The ErrorCallback is used for methods that can fail in which case it |
| 173 | // is called, in the success case the callback is simply not called. |
| 174 | typedef base::Callback<void()> ErrorCallback; |
| 175 | |
| 176 | // Returns the services (as BluetoothServiceRecord objects) that this device |
| 177 | // provides. |
| 178 | typedef ScopedVector<BluetoothServiceRecord> ServiceRecordList; |
| 179 | typedef base::Callback<void(const ServiceRecordList&)> ServiceRecordsCallback; |
| 180 | virtual void GetServiceRecords(const ServiceRecordsCallback& callback, |
| 181 | const ErrorCallback& error_callback) = 0; |
| 182 | |
| 183 | // Indicates whether this device provides the given service. |uuid| should |
| 184 | // be in canonical form (see utils::CanonicalUuid). |
| 185 | virtual bool ProvidesServiceWithUUID(const std::string& uuid) const = 0; |
| 186 | |
| 187 | // The ProvidesServiceCallback is used by ProvidesServiceWithName to indicate |
| 188 | // whether or not a matching service was found. |
| 189 | typedef base::Callback<void(bool)> ProvidesServiceCallback; |
| 190 | |
| 191 | // Indicates whether this device provides the given service. |
| 192 | virtual void ProvidesServiceWithName( |
| 193 | const std::string& name, |
| 194 | const ProvidesServiceCallback& callback) = 0; |
| 195 | |
| 196 | // Indicates whether the device is currently pairing and expecting a |
| 197 | // PIN Code to be returned. |
| 198 | virtual bool ExpectingPinCode() const = 0; |
| 199 | |
| 200 | // Indicates whether the device is currently pairing and expecting a |
| 201 | // Passkey to be returned. |
| 202 | virtual bool ExpectingPasskey() const = 0; |
| 203 | |
| 204 | // Indicates whether the device is currently pairing and expecting |
| 205 | // confirmation of a displayed passkey. |
| 206 | virtual bool ExpectingConfirmation() const = 0; |
| 207 | |
| 208 | // SocketCallback is used by ConnectToService to return a BluetoothSocket to |
| 209 | // the caller, or NULL if there was an error. The socket will remain open |
| 210 | // until the last reference to the returned BluetoothSocket is released. |
| 211 | typedef base::Callback<void(scoped_refptr<BluetoothSocket>)> |
| 212 | SocketCallback; |
| 213 | |
| 214 | // Initiates a connection to the device, pairing first if necessary. |
| 215 | // |
| 216 | // Method calls will be made on the supplied object |pairing_delegate| |
| 217 | // to indicate what display, and in response should make method calls |
| 218 | // back to the device object. Not all devices require user responses |
| 219 | // during pairing, so it is normal for |pairing_delegate| to receive no |
| 220 | // calls. To explicitly force a low-security connection without bonding, |
| 221 | // pass NULL, though this is ignored if the device is already paired. |
| 222 | // |
| 223 | // If the request fails, |error_callback| will be called; otherwise, |
| 224 | // |callback| is called when the request is complete. |
| 225 | virtual void Connect(PairingDelegate* pairing_delegate, |
| 226 | const base::Closure& callback, |
| 227 | const ErrorCallback& error_callback) = 0; |
| 228 | |
| 229 | // Sends the PIN code |pincode| to the remote device during pairing. |
| 230 | // |
| 231 | // PIN Codes are generally required for Bluetooth 2.0 and earlier devices |
| 232 | // for which there is no automatic pairing or special handling. |
| 233 | virtual void SetPinCode(const std::string& pincode) = 0; |
| 234 | |
| 235 | // Sends the Passkey |passkey| to the remote device during pairing. |
| 236 | // |
| 237 | // Passkeys are generally required for Bluetooth 2.1 and later devices |
| 238 | // which cannot provide input or display on their own, and don't accept |
| 239 | // passkey-less pairing, and are a numeric in the range 0-999999. |
| 240 | virtual void SetPasskey(uint32 passkey) = 0; |
| 241 | |
| 242 | // Confirms to the remote device during pairing that a passkey provided by |
| 243 | // the ConfirmPasskey() delegate call is displayed on both devices. |
| 244 | virtual void ConfirmPairing() = 0; |
| 245 | |
| 246 | // Rejects a pairing or connection request from a remote device. |
| 247 | virtual void RejectPairing() = 0; |
| 248 | |
| 249 | // Cancels a pairing or connection attempt to a remote device. |
| 250 | virtual void CancelPairing() = 0; |
| 251 | |
| 252 | // Disconnects the device, terminating the low-level ACL connection |
| 253 | // and any application connections using it. Link keys and other pairing |
| 254 | // information are not discarded, and the device object is not deleted. |
| 255 | // If the request fails, |error_callback| will be called; otherwise, |
| 256 | // |callback| is called when the request is complete. |
| 257 | virtual void Disconnect(const base::Closure& callback, |
| 258 | const ErrorCallback& error_callback) = 0; |
| 259 | |
| 260 | // Disconnects the device, terminating the low-level ACL connection |
| 261 | // and any application connections using it, and then discards link keys |
| 262 | // and other pairing information. The device object remainds valid until |
| 263 | // returing from the calling function, after which it should be assumed to |
| 264 | // have been deleted. If the request fails, |error_callback| will be called. |
| 265 | // There is no callback for success beause this object is often deleted |
| 266 | // before that callback would be called. |
| 267 | virtual void Forget(const ErrorCallback& error_callback) = 0; |
| 268 | |
| 269 | // Attempts to open a socket to a service matching |uuid| on this device. If |
| 270 | // the connection is successful, |callback| is called with a BluetoothSocket. |
| 271 | // Otherwise |callback| is called with NULL. The socket is closed as soon as |
| 272 | // all references to the BluetoothSocket are released. Note that the |
| 273 | // BluetoothSocket object can outlive both this BluetoothDevice and the |
| 274 | // BluetoothAdapter for this device. |
| 275 | virtual void ConnectToService(const std::string& service_uuid, |
| 276 | const SocketCallback& callback) = 0; |
| 277 | |
| 278 | // Sets the Out Of Band pairing data for this device to |data|. Exactly one |
| 279 | // of |callback| or |error_callback| will be run. |
| 280 | virtual void SetOutOfBandPairingData( |
| 281 | const BluetoothOutOfBandPairingData& data, |
| 282 | const base::Closure& callback, |
| 283 | const ErrorCallback& error_callback) = 0; |
| 284 | |
| 285 | // Clears the Out Of Band pairing data for this device. Exactly one of |
| 286 | // |callback| or |error_callback| will be run. |
| 287 | virtual void ClearOutOfBandPairingData( |
| 288 | const base::Closure& callback, |
| 289 | const ErrorCallback& error_callback) = 0; |
| 290 | |
| 291 | protected: |
| 292 | BluetoothDevice(); |
| 293 | |
| 294 | // The Bluetooth class of the device, a bitmask that may be decoded using |
| 295 | // https://www.bluetooth.org/Technical/AssignedNumbers/baseband.htm |
| 296 | uint32 bluetooth_class_; |
| 297 | |
| 298 | // The name of the device, as supplied by the remote device. |
| 299 | std::string name_; |
| 300 | |
| 301 | // The Bluetooth address of the device. |
| 302 | std::string address_; |
| 303 | |
| 304 | // Tracked device state, updated by the adapter managing the lifecyle of |
| 305 | // the device. |
| 306 | bool visible_; |
| 307 | bool bonded_; |
| 308 | bool connected_; |
| 309 | |
| 310 | private: |
| 311 | // Returns a localized string containing the device's bluetooth address and |
| 312 | // a device type for display when |name_| is empty. |
| 313 | string16 GetAddressWithLocalizedDeviceTypeName() const; |
| 314 | }; |
| 315 | |
| 316 | } // namespace device |
| 317 | |
| 318 | #endif // DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_ |