338 lines
10 KiB
Python
338 lines
10 KiB
Python
from __future__ import unicode_literals
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import base64
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import logging
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import os
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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from PIL import Image
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import sh
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from django.utils.translation import string_concat, ugettext_lazy as _
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from common.settings import setting_temporary_directory
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from common.utils import fs_cleanup, mkstemp
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from mimetype.api import get_mimetype
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from .exceptions import InvalidOfficeFormat, OfficeConversionError
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from .literals import DEFAULT_PAGE_NUMBER, DEFAULT_FILE_FORMAT
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from .settings import setting_libreoffice_path
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CHUNK_SIZE = 1024
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logger = logging.getLogger(__name__)
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try:
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LIBREOFFICE = sh.Command(
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setting_libreoffice_path.value
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).bake('--headless', '--convert-to', 'pdf')
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except sh.CommandNotFound:
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LIBREOFFICE = None
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CONVERTER_OFFICE_FILE_MIMETYPES = (
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'application/msword',
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'application/mswrite',
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'application/mspowerpoint',
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'application/msexcel',
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'application/pgp-keys',
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'application/vnd.ms-excel',
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'application/vnd.ms-excel.addin.macroEnabled.12',
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'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
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'application/vnd.ms-powerpoint',
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'application/vnd.oasis.opendocument.chart',
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'application/vnd.oasis.opendocument.chart-template',
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'application/vnd.oasis.opendocument.formula',
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'application/vnd.oasis.opendocument.formula-template',
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'application/vnd.oasis.opendocument.graphics',
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'application/vnd.oasis.opendocument.graphics-template',
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'application/vnd.oasis.opendocument.image',
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'application/vnd.oasis.opendocument.image-template',
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'application/vnd.oasis.opendocument.presentation',
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'application/vnd.oasis.opendocument.presentation-template',
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'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
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'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
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'application/vnd.openxmlformats-officedocument.presentationml.template',
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'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
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'application/vnd.openxmlformats-officedocument.presentationml.presentation',
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'application/vnd.openxmlformats-officedocument.presentationml.slide',
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'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
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'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
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'application/vnd.oasis.opendocument.spreadsheet',
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'application/vnd.oasis.opendocument.spreadsheet-template',
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'application/vnd.oasis.opendocument.text',
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'application/vnd.oasis.opendocument.text-master',
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'application/vnd.oasis.opendocument.text-template',
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'application/vnd.oasis.opendocument.text-web',
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'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
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'application/vnd.ms-office',
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'application/xml',
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'text/x-c',
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'text/x-c++',
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'text/x-pascal',
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'text/x-msdos-batch',
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'text/x-python',
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'text/x-shellscript',
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'text/plain',
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'text/rtf',
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)
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class ConverterBase(object):
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def __init__(self, file_object, mime_type=None):
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self.file_object = file_object
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self.image = None
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self.mime_type = mime_type or get_mimetype(
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file_object=file_object, mimetype_only=False
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)[0]
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self.soffice_file = None
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def to_pdf(self):
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if self.mime_type in CONVERTER_OFFICE_FILE_MIMETYPES:
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return self.soffice()
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else:
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raise InvalidOfficeFormat(_('Not an office file format.'))
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def seek(self, page_number):
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# Starting with #0
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self.file_object.seek(0)
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try:
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self.image = Image.open(self.file_object)
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except IOError:
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# Cannot identify image file
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self.image = self.convert(page_number=page_number)
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else:
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self.image.seek(page_number)
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self.image.load()
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def soffice(self):
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"""
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Executes LibreOffice as a subprocess
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"""
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if not os.path.exists(setting_libreoffice_path.value):
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raise OfficeConversionError(
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_(
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'LibreOffice not installed or not found at path: %s'
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) % setting_libreoffice_path.value
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)
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new_file_object, input_filepath = mkstemp()
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self.file_object.seek(0)
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os.write(new_file_object, self.file_object.read())
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self.file_object.seek(0)
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os.lseek(new_file_object, 0, os.SEEK_SET)
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os.close(new_file_object)
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libreoffice_filter = None
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if self.mime_type == 'text/plain':
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libreoffice_filter = 'Text (encoded):UTF8,LF,,,'
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args = (input_filepath, '--outdir', setting_temporary_directory.value)
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kwargs = {'_env': {'HOME': setting_temporary_directory.value}}
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if libreoffice_filter:
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kwargs.update({'infilter': libreoffice_filter})
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try:
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LIBREOFFICE(*args, **kwargs)
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except sh.ErrorReturnCode as exception:
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raise OfficeConversionError(exception)
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finally:
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fs_cleanup(input_filepath)
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filename, extension = os.path.splitext(
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os.path.basename(input_filepath)
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)
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logger.debug('filename: %s', filename)
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logger.debug('extension: %s', extension)
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converted_output = os.path.join(
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setting_temporary_directory.value, os.path.extsep.join(
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(filename, 'pdf')
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)
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)
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logger.debug('converted_output: %s', converted_output)
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with open(converted_output) as converted_file_object:
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while True:
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data = converted_file_object.read(CHUNK_SIZE)
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if not data:
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break
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yield data
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fs_cleanup(input_filepath)
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fs_cleanup(converted_output)
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def get_page(self, output_format=DEFAULT_FILE_FORMAT, as_base64=False):
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if not self.image:
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self.seek(0)
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image_buffer = StringIO()
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new_mode = self.image.mode
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if output_format.upper() == 'JPEG':
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if self.image.mode == 'P':
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new_mode = 'RGB'
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if 'transparency' in self.image.info:
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new_mode = 'RGBA'
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self.image.convert(new_mode).save(image_buffer, format=output_format)
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if as_base64:
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return 'data:{};base64,{}'.format(Image.MIME[output_format], base64.b64encode(image_buffer.getvalue()))
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else:
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image_buffer.seek(0)
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return image_buffer
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def convert(self, page_number=DEFAULT_PAGE_NUMBER):
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self.page_number = page_number
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def transform(self, transformation):
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if not self.image:
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self.seek(0)
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self.image = transformation.execute_on(self.image)
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def transform_many(self, transformations):
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if not self.image:
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self.seek(0)
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for transformation in transformations:
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self.image = transformation.execute_on(self.image)
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def get_page_count(self):
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try:
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self.soffice_file = self.to_pdf()
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except InvalidOfficeFormat as exception:
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logger.debug('Is not an office format document; %s', exception)
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class BaseTransformation(object):
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name = 'base_transformation'
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arguments = ()
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_registry = {}
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@classmethod
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def register(cls, transformation):
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cls._registry[transformation.name] = transformation
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@classmethod
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def get_transformation_choices(cls):
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return [
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(name, klass.get_label()) for name, klass in cls._registry.items()
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]
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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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return string_concat(cls.label, ': ', ', '.join(cls.arguments))
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def __init__(self, **kwargs):
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for argument_name in self.arguments:
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setattr(self, argument_name, kwargs.get(argument_name))
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def execute_on(self, image):
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self.image = image
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self.aspect = 1.0 * image.size[0] / image.size[1]
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class TransformationResize(BaseTransformation):
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name = 'resize'
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arguments = ('width', 'height')
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label = _('Resize')
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def execute_on(self, *args, **kwargs):
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super(TransformationResize, self).execute_on(*args, **kwargs)
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fit = False
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width = int(self.width)
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height = int(self.height or 1.0 * width / self.aspect)
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factor = 1
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while self.image.size[0] / factor > 2 * width and self.image.size[1] * 2 / factor > 2 * height:
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factor *= 2
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if factor > 1:
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self.image.thumbnail(
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(self.image.size[0] / factor, self.image.size[1] / factor),
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Image.NEAREST
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)
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# calculate the cropping box and get the cropped part
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if fit:
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x1 = y1 = 0
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x2, y2 = self.image.size
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wRatio = 1.0 * x2 / width
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hRatio = 1.0 * y2 / height
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if hRatio > wRatio:
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y1 = y2 / 2 - height * wRatio / 2
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y2 = y2 / 2 + height * wRatio / 2
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else:
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x1 = x2 / 2 - width * hRatio / 2
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x2 = x2 / 2 + width * hRatio / 2
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self.image = self.image.crop((x1, y1, x2, y2))
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# Resize the image with best quality algorithm ANTI-ALIAS
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self.image.thumbnail((width, height), Image.ANTIALIAS)
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return self.image
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class TransformationRotate(BaseTransformation):
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name = 'rotate'
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arguments = ('degrees',)
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label = _('Rotate')
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def execute_on(self, *args, **kwargs):
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super(TransformationRotate, self).execute_on(*args, **kwargs)
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return self.image.rotate(
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360 - self.degrees, resample=Image.BICUBIC, expand=True
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)
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class TransformationZoom(BaseTransformation):
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name = 'zoom'
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arguments = ('percent',)
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label = _('Zoom')
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def execute_on(self, *args, **kwargs):
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super(TransformationZoom, self).execute_on(*args, **kwargs)
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decimal_value = float(self.percent) / 100
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return self.image.resize(
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(
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int(self.image.size[0] * decimal_value),
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int(self.image.size[1] * decimal_value)
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), Image.ANTIALIAS
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)
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class TransformationCrop(BaseTransformation):
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name = 'crop'
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arguments = ('left', 'top', 'right', 'bottom',)
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label = _('Crop')
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def execute_on(self, *args, **kwargs):
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super(TransformationCrop, self).execute_on(*args, **kwargs)
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return self.image.crop(
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(self.left, self.top, self.right, self.bottom)
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)
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BaseTransformation.register(TransformationResize)
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BaseTransformation.register(TransformationRotate)
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BaseTransformation.register(TransformationZoom)
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BaseTransformation.register(TransformationCrop)
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