234 lines
7.7 KiB
Python
234 lines
7.7 KiB
Python
from __future__ import unicode_literals
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import base64
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from io import BytesIO
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import logging
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import os
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from PIL import Image
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import sh
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import yaml
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from django.utils.translation import ugettext_lazy as _
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from common.settings import setting_temporary_directory
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from common.utils import fs_cleanup, mkdtemp, 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 (
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DEFAULT_LIBREOFFICE_PATH, DEFAULT_PAGE_NUMBER, DEFAULT_PILLOW_FORMAT
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)
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from .settings import setting_graphics_backend_config
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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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yaml.load(setting_graphics_backend_config.value).get(
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'libreoffice_path', DEFAULT_LIBREOFFICE_PATH
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)
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).bake('--headless', '--convert-to', 'pdf:writer_pdf_Export')
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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 LIBREOFFICE:
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raise OfficeConversionError(
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_('LibreOffice not installed or not found.')
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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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libreoffice_home_directory = mkdtemp()
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args = (
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input_filepath, '--outdir', setting_temporary_directory.value,
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'-env:UserInstallation=file://{}'.format(
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os.path.join(
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libreoffice_home_directory, 'LibreOffice_Conversion'
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)
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),
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)
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kwargs = {'_env': {'HOME': libreoffice_home_directory}}
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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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except Exception as exception:
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logger.error('Exception launching Libre Office; %s', exception)
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raise
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finally:
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fs_cleanup(input_filepath)
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fs_cleanup(libreoffice_home_directory)
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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=None, as_base64=False):
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output_format = output_format or yaml.load(
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setting_graphics_backend_config.value
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).get(
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'pillow_format', DEFAULT_PILLOW_FORMAT
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)
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if not self.image:
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self.seek(0)
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image_buffer = BytesIO()
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new_mode = self.image.mode
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if output_format.upper() == 'JPEG':
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# JPEG doesn't support transparency channel, convert the image to
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# RGB. Removes modes: P and RGBA
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new_mode = 'RGB'
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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(image=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(image=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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def detect_orientation(self, page_number):
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# Must be overrided by subclass
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pass
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