74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
#!/usr/bin/env python3
|
|
#
|
|
# Electron Cash - lightweight Bitcoin client
|
|
# Copyright (C) 2019 Axel Gembe <derago@gmail.com>
|
|
#
|
|
# 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:
|
|
#
|
|
# The above copyright notice and this permission notice shall be
|
|
# included in all copies or substantial portions of the Software.
|
|
#
|
|
# 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
|
|
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
# SOFTWARE.
|
|
#
|
|
# A module, that, given an image (buffer), finds and decodes a QR code in it.
|
|
|
|
from typing import Optional
|
|
|
|
from ..logging import get_logger
|
|
|
|
from .abstract_base import AbstractQrCodeReader, QrCodeResult
|
|
|
|
|
|
_logger = get_logger(__name__)
|
|
|
|
|
|
class MissingQrDetectionLib(RuntimeError):
|
|
''' Raised if we can't find zbar or whatever other platform lib
|
|
we require to detect QR in image frames. '''
|
|
|
|
|
|
def get_qr_reader() -> AbstractQrCodeReader:
|
|
"""
|
|
Get the Qr code reader for the current platform.
|
|
Might raise exception: MissingQrDetectionLib.
|
|
"""
|
|
excs = []
|
|
try:
|
|
from .zbar import ZbarQrCodeReader
|
|
return ZbarQrCodeReader()
|
|
"""
|
|
# DEBUG CODE BELOW
|
|
# If you want to test this code on a platform that doesn't yet work or have
|
|
# zbar, use the below...
|
|
class Fake(AbstractQrCodeReader):
|
|
def read_qr_code(self, buffer, buffer_size, dummy, width, height, frame_id = -1):
|
|
''' fake noop to test '''
|
|
return []
|
|
return Fake()
|
|
"""
|
|
except MissingLib as e:
|
|
_logger.exception("")
|
|
excs.append(e)
|
|
|
|
raise MissingQrDetectionLib(f"The platform QR detection library is not available.\nerrors: {excs!r}")
|
|
|
|
|
|
# --- Internals below (not part of external API)
|
|
|
|
class MissingLib(RuntimeError):
|
|
''' Raised by underlying implementation if missing libs '''
|
|
pass
|