139 lines
4.4 KiB
Python
139 lines
4.4 KiB
Python
from __future__ import unicode_literals
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import logging
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from PIL import Image
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from pyzbar.pyzbar import decode
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import qrcode
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from django.utils.encoding import force_text, python_2_unicode_compatible
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from django.utils.translation import string_concat
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from mayan.apps.common.serialization import yaml_dump, yaml_load
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from mayan.apps.documents.literals import DOCUMENT_IMAGE_TASK_TIMEOUT
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from mayan.apps.documents.tasks import task_generate_document_page_image
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from .literals import (CONTROL_CODE_MAGIC_NUMBER, CONTROL_CODE_SEPARATOR)
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logger = logging.getLogger(__name__)
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@python_2_unicode_compatible
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class ControlCode(object):
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_registry = {}
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arguments = ()
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@classmethod
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def all(cls):
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return cls._registry.values()
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@classmethod
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def get(cls, name):
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return cls._registry[name]
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@classmethod
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def get_label(cls):
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if cls.arguments:
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return string_concat(cls.label, ': ', ', '.join(cls.arguments))
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else:
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return cls.label
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@classmethod
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def get_choices(cls):
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return sorted(
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[
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(klass.name, klass.get_label()) for klass in cls.all()
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]
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)
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@classmethod
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def process_document_version(cls, document_version):
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logger.info(
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'Starting processing document version: %s', document_version
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)
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for document_page in document_version.pages.all():
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task = task_generate_document_page_image.apply_async(
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kwargs=dict(
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document_page_id=document_page.pk
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)
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)
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cache_filename = task.get(
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timeout=DOCUMENT_IMAGE_TASK_TIMEOUT, disable_sync_subtasks=False
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)
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results = []
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# Collect control codes per page
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with document_page.cache_partition.get_file(filename=cache_filename).open() as file_object:
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image = Image.open(file_object)
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for code in decode(image):
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logger.debug('code found: %s', code)
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parts = code.data.split(CONTROL_CODE_SEPARATOR)
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if parts[0] == CONTROL_CODE_MAGIC_NUMBER:
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try:
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ControlCode.get(name=parts[2])
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except KeyError:
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# Unknown control code name
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pass
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else:
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document_page.enabled = False
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document_page.save()
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arguments = CONTROL_CODE_SEPARATOR.join(parts[3:])
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results.append(
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{
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'order': parts[1], 'name': parts[2],
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'arguments': arguments
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}
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)
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# Sort control codes so that they are executed in the
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# specified order after the collection finishes.
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results.sort(key=lambda x: x['order'])
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context = {'document_page': document_page}
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for result in results:
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control_code_class = ControlCode.get(name=result['name'])
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control_code = control_code_class(
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**yaml_load(result['arguments'])
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)
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control_code.execute(context=context)
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@classmethod
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def register(cls, control_code):
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cls._registry[control_code.name] = control_code
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def __init__(self, **kwargs):
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self.kwargs = {}
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for argument_name in self.arguments:
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self.kwargs[argument_name] = kwargs.get(argument_name)
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def __str__(self):
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return '{} {}'.format(self.label, self.kwargs)
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def get_image(self, order=0):
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return qrcode.make(self.get_qrcode_string(order=order))
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def get_qrcode_string(self, order=0):
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result = []
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result.append(CONTROL_CODE_MAGIC_NUMBER)
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result.append(force_text(order))
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result.append(self.name)
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result.append(
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yaml_dump(
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data=self.kwargs, allow_unicode=True, default_flow_style=True
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)
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)
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return CONTROL_CODE_SEPARATOR.join(result)
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def execute(self, context):
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raise NotImplementedError(
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'Your %s class has not defined the required '
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'execue() method.' % self.__class__.__name__
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)
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