SomberNight
3 years ago
17 changed files with 251 additions and 184 deletions
@ -1,30 +1,141 @@ |
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#!/usr/bin/env python3 |
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# Copyright (C) 2021 The Electrum developers |
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# Distributed under the MIT software license, see the accompanying |
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# file LICENCE or http://www.opensource.org/licenses/mit-license.php |
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# |
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# Electron Cash - lightweight Bitcoin client |
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# Copyright (C) 2019 Axel Gembe <derago@gmail.com> |
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# We have two toolchains to scan qr codes: |
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# 1. access camera via QtMultimedia, take picture, feed picture to zbar |
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# 2. let zbar handle whole flow (including accessing the camera) |
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# |
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# Permission is hereby granted, free of charge, to any person |
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# obtaining a copy of this software and associated documentation files |
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# (the "Software"), to deal in the Software without restriction, |
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# including without limitation the rights to use, copy, modify, merge, |
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# publish, distribute, sublicense, and/or sell copies of the Software, |
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# and to permit persons to whom the Software is furnished to do so, |
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# subject to the following conditions: |
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# notes: |
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# - zbar needs to be compiled with platform-dependent extra config options to be able |
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# to access the camera |
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# - zbar fails to access the camera on macOS |
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# - qtmultimedia seems to support more cameras on Windows than zbar |
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# - qtmultimedia is often not packaged with PyQt5 |
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# in particular, on debian, you need both "python3-pyqt5" and "python3-pyqt5.qtmultimedia" |
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# - older versions of qtmultimedia don't seem to work reliably |
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# |
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# The above copyright notice and this permission notice shall be |
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# included in all copies or substantial portions of the Software. |
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# Considering the above, we use QtMultimedia for Windows and macOS, as there |
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# most users run our binaries where we can make sure the packaged versions work well. |
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# On Linux where many people run from source, we use zbar. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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|
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from .camera_dialog import (QrReaderCameraDialog, CameraError, NoCamerasFound, |
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NoCameraResolutionsFound, MissingQrDetectionLib) |
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from .validator import (QrReaderValidatorResult, AbstractQrReaderValidator, |
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QrReaderValidatorCounting, QrReaderValidatorColorizing, |
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QrReaderValidatorStrong, QrReaderValidatorCounted) |
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# Note: this module is safe to import on all platforms. |
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|
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import sys |
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from typing import Callable, Optional, TYPE_CHECKING, Mapping |
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|
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from PyQt5.QtWidgets import QMessageBox, QWidget |
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|
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from electrum.i18n import _ |
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from electrum.util import UserFacingException |
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from electrum.logging import get_logger |
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|
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from electrum.gui.qt.util import MessageBoxMixin, custom_message_box |
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|
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|
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if TYPE_CHECKING: |
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from electrum.simple_config import SimpleConfig |
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|
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|
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_logger = get_logger(__name__) |
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|
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|
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def scan_qrcode( |
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*, |
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parent: Optional[QWidget], |
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config: 'SimpleConfig', |
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callback: Callable[[bool, str, Optional[str]], None], |
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) -> None: |
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if sys.platform == 'darwin' or sys.platform in ('windows', 'win32'): |
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_scan_qrcode_using_qtmultimedia(parent=parent, config=config, callback=callback) |
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else: # desktop Linux and similar |
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_scan_qrcode_using_zbar(parent=parent, config=config, callback=callback) |
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|
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|
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def find_system_cameras() -> Mapping[str, str]: |
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"""Returns a camera_description -> camera_path map.""" |
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if sys.platform == 'darwin' or sys.platform in ('windows', 'win32'): |
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try: |
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from .qtmultimedia import find_system_cameras |
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except ImportError as e: |
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return {} |
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else: |
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return find_system_cameras() |
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else: # desktop Linux and similar |
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from electrum import qrscanner |
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return qrscanner.find_system_cameras() |
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|
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|
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# --- Internals below (not part of external API) |
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|
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def _scan_qrcode_using_zbar( |
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*, |
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parent: Optional[QWidget], |
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config: 'SimpleConfig', |
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callback: Callable[[bool, str, Optional[str]], None], |
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) -> None: |
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from electrum import qrscanner |
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data = None |
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try: |
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data = qrscanner.scan_barcode(config.get_video_device()) |
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except UserFacingException as e: |
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success = False |
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error = str(e) |
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except BaseException as e: |
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_logger.exception('camera error') |
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success = False |
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error = repr(e) |
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else: |
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success = True |
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error = "" |
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callback(success, error, data) |
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|
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|
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# Use a global to prevent multiple QR dialogs created simultaneously |
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_qr_dialog = None |
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|
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|
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def _scan_qrcode_using_qtmultimedia( |
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*, |
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parent: Optional[QWidget], |
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config: 'SimpleConfig', |
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callback: Callable[[bool, str, Optional[str]], None], |
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) -> None: |
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try: |
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from .qtmultimedia import QrReaderCameraDialog, CameraError, MissingQrDetectionLib |
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except ImportError as e: |
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icon = QMessageBox.Warning |
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title = _("QR Reader Error") |
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message = _("QR reader failed to load. This may happen if " |
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"you are using an older version of PyQt5.") + "\n\n" + str(e) |
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if isinstance(parent, MessageBoxMixin): |
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parent.msg_box(title=title, text=message, icon=icon, parent=None) |
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else: |
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custom_message_box(title=title, text=message, icon=icon, parent=parent) |
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return |
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|
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global _qr_dialog |
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if _qr_dialog: |
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_logger.warning("QR dialog is already presented, ignoring.") |
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return |
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_qr_dialog = None |
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try: |
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_qr_dialog = QrReaderCameraDialog(parent=parent, config=config) |
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|
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def _on_qr_reader_finished(success: bool, error: str, data): |
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global _qr_dialog |
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if _qr_dialog: |
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_qr_dialog.deleteLater() |
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_qr_dialog = None |
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callback(success, error, data) |
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|
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_qr_dialog.qr_finished.connect(_on_qr_reader_finished) |
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_qr_dialog.start_scan(config.get_video_device()) |
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except (MissingQrDetectionLib, CameraError) as e: |
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_qr_dialog = None |
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callback(False, str(e), None) |
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except Exception as e: |
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_logger.exception('camera error') |
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_qr_dialog = None |
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callback(False, repr(e), None) |
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|
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|
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@ -0,0 +1,39 @@ |
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#!/usr/bin/env python3 |
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# |
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# Electron Cash - lightweight Bitcoin client |
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# Copyright (C) 2019 Axel Gembe <derago@gmail.com> |
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# |
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# Permission is hereby granted, free of charge, to any person |
|||
# obtaining a copy of this software and associated documentation files |
|||
# (the "Software"), to deal in the Software without restriction, |
|||
# including without limitation the rights to use, copy, modify, merge, |
|||
# publish, distribute, sublicense, and/or sell copies of the Software, |
|||
# and to permit persons to whom the Software is furnished to do so, |
|||
# subject to the following conditions: |
|||
# |
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# The above copyright notice and this permission notice shall be |
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# included in all copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
|||
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
|||
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
|||
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
|||
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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|
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from typing import Mapping |
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|
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from .camera_dialog import (QrReaderCameraDialog, CameraError, NoCamerasFound, |
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NoCameraResolutionsFound, MissingQrDetectionLib) |
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from .validator import (QrReaderValidatorResult, AbstractQrReaderValidator, |
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QrReaderValidatorCounting, QrReaderValidatorColorizing, |
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QrReaderValidatorStrong, QrReaderValidatorCounted) |
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|
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|
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def find_system_cameras() -> Mapping[str, str]: |
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"""Returns a camera_description -> camera_path map.""" |
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from PyQt5.QtMultimedia import QCameraInfo |
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system_cameras = QCameraInfo.availableCameras() |
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return {cam.description(): cam.deviceName() for cam in system_cameras} |
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