def get_image(self, transformations=None):
cache_filename = self.cache_filename
logger.debug('Page cache filename: %s', cache_filename)
if not setting_disable_base_image_cache.value and cache_storage_backend.exists(
cache_filename):
logger.debug('Page cache file "%s" found', cache_filename)
converter = converter_class(
file_object=cache_storage_backend.open(cache_filename))
converter.seek(0)
else:
logger.debug('Page cache file "%s" not found', cache_filename)
try:
converter = converter_class(
file_object=self.document_version.get_intermidiate_file())
converter.seek(page_number=self.page_number - 1)
page_image = converter.get_page()
with cache_storage_backend.open(cache_filename,
'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error('Error creating page cache file "%s"; %s',
cache_filename, exception)
cache_storage_backend.delete(cache_filename)
raise
for transformation in transformations:
converter.transform(transformation=transformation)
return converter.get_page()
def get_intermidiate_file(self):
cache_filename = self.cache_filename
logger.debug('Intermidiate filename: %s', cache_filename)
if storage_documentimagecache.exists(cache_filename):
logger.debug('Intermidiate file "%s" found.', cache_filename)
return storage_documentimagecache.open(cache_filename)
else:
logger.debug('Intermidiate file "%s" not found.', cache_filename)
try:
converter = converter_class(file_object=self.open())
pdf_file_object = converter.to_pdf()
with storage_documentimagecache.open(cache_filename, mode='wb+') as file_object:
for chunk in pdf_file_object:
file_object.write(chunk)
return storage_documentimagecache.open(cache_filename)
except InvalidOfficeFormat:
return self.open()
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating intermediate file "%s"; %s.',
cache_filename, exception
)
storage_documentimagecache.delete(cache_filename)
raise
def get_image(self, transformations=None):
cache_filename = self.cache_filename
file_object = None
try:
file_object = open(self.get_full_path())
converter = converter_class(file_object=file_object)
page_image = converter.get_page()
# Since open "wb+" doesn't create files, check if the file
# exists, if not then create it
if not storage_staging_file_image_cache.exists(cache_filename):
storage_staging_file_image_cache.save(name=cache_filename, content=ContentFile(content=''))
with storage_staging_file_image_cache.open(cache_filename, 'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating staging file cache "%s"; %s',
cache_filename, exception
)
storage_staging_file_image_cache.delete(cache_filename)
if file_object:
file_object.close()
raise
for transformation in transformations:
converter.transform(transformation=transformation)
result = converter.get_page()
file_object.close()
return result
def update_page_count(self, save=True):
try:
with self.open() as file_object:
converter = converter_class(
file_object=file_object, mime_type=self.mimetype
)
detected_pages = converter.get_page_count()
except PageCountError:
# If converter backend doesn't understand the format,
# use 1 as the total page count
pass
else:
with transaction.atomic():
self.pages.all().delete()
for page_number in range(detected_pages):
DocumentPage.objects.create(
document_version=self, page_number=page_number + 1
)
# TODO: is this needed anymore
if save:
self.save()
return detected_pages
def update_page_count(self, save=True):
try:
with self.open() as file_object:
converter = converter_class(
file_object=file_object, mime_type=self.mimetype
)
detected_pages = converter.get_page_count()
except PageCountError:
# If converter backend doesn't understand the format,
# use 1 as the total page count
pass
else:
with transaction.atomic():
self.pages.all().delete()
for page_number in range(detected_pages):
DocumentPage.objects.create(
document_version=self, page_number=page_number + 1
)
# TODO: is this needed anymore
if save:
self.save()
return detected_pages
def get_intermidiate_file(self):
cache_filename = self.cache_filename
logger.debug('Intermidiate filename: %s', cache_filename)
if cache_storage_backend.exists(cache_filename):
logger.debug('Intermidiate file "%s" found.', cache_filename)
return cache_storage_backend.open(cache_filename)
else:
logger.debug('Intermidiate file "%s" not found.', cache_filename)
try:
converter = converter_class(file_object=self.open())
pdf_file_object = converter.to_pdf()
with cache_storage_backend.open(cache_filename, 'wb+') as file_object:
for chunk in pdf_file_object:
file_object.write(chunk)
return cache_storage_backend.open(cache_filename)
except InvalidOfficeFormat:
return self.open()
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating intermediate file "%s"; %s.',
cache_filename, exception
)
cache_storage_backend.delete(cache_filename)
raise
def get_image(self, transformations=None):
cache_filename = self.cache_filename
file_object = None
try:
file_object = open(self.get_full_path(), mode='rb')
converter = converter_class(file_object=file_object)
page_image = converter.get_page()
# Since open "wb+" doesn't create files, check if the file
# exists, if not then create it
if not storage_staging_file_image_cache.exists(cache_filename):
storage_staging_file_image_cache.save(name=cache_filename, content=ContentFile(content=''))
with storage_staging_file_image_cache.open(cache_filename, 'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating staging file cache "%s"; %s',
cache_filename, exception
)
storage_staging_file_image_cache.delete(cache_filename)
if file_object:
file_object.close()
raise
for transformation in transformations:
converter.transform(transformation=transformation)
result = converter.get_page()
file_object.close()
return result
def detect_orientation(self):
with self.document_version.open() as file_object:
converter = converter_class(
file_object=file_object,
mime_type=self.document_version.mimetype
)
return converter.detect_orientation(
page_number=self.page_number
)
def detect_orientation(self):
with self.document_version.open() as file_object:
converter = converter_class(
file_object=file_object,
mime_type=self.document_version.mimetype
)
return converter.detect_orientation(
page_number=self.page_number
)
def execute(self, file_object, language=None, transformations=None):
self.language = language
if not transformations:
transformations = []
self.converter = converter_class(file_object=file_object)
for transformation in transformations:
self.converter.transform(transformation=transformation)
def execute(self, file_object, language=None, transformations=None):
self.language = language
if not transformations:
transformations = []
self.converter = converter_class(file_object=file_object)
for transformation in transformations:
self.converter.transform(transformation=transformation)
def get_image(self, transformations=None):
cache_filename = self.cache_filename
logger.debug('Page cache filename: %s', cache_filename)
if not setting_disable_base_image_cache.value and storage_documentimagecache.exists(cache_filename):
logger.debug('Page cache file "%s" found', cache_filename)
converter = converter_class(
file_object=storage_documentimagecache.open(cache_filename)
)
converter.seek(0)
else:
logger.debug('Page cache file "%s" not found', cache_filename)
try:
converter = converter_class(
file_object=self.document_version.get_intermidiate_file()
)
converter.seek(page_number=self.page_number - 1)
page_image = converter.get_page()
# Since open "wb+" doesn't create files, check if the file
# exists, if not then create it
if not storage_documentimagecache.exists(cache_filename):
storage_documentimagecache.save(name=cache_filename, content=ContentFile(content=''))
with storage_documentimagecache.open(cache_filename, 'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating page cache file "%s"; %s',
cache_filename, exception
)
storage_documentimagecache.delete(cache_filename)
raise
for transformation in transformations:
converter.transform(transformation=transformation)
return converter.get_page()
def get_image(self, transformations=None):
cache_filename = self.cache_filename
logger.debug('Page cache filename: %s', cache_filename)
if not setting_disable_base_image_cache.value and storage_documentimagecache.exists(cache_filename):
logger.debug('Page cache file "%s" found', cache_filename)
converter = converter_class(
file_object=storage_documentimagecache.open(cache_filename)
)
converter.seek(0)
else:
logger.debug('Page cache file "%s" not found', cache_filename)
try:
converter = converter_class(
file_object=self.document_version.get_intermidiate_file()
)
converter.seek(page_number=self.page_number - 1)
page_image = converter.get_page()
# Since open "wb+" doesn't create files, check if the file
# exists, if not then create it
if not storage_documentimagecache.exists(cache_filename):
storage_documentimagecache.save(name=cache_filename, content=ContentFile(content=''))
with storage_documentimagecache.open(cache_filename, 'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating page cache file "%s"; %s',
cache_filename, exception
)
storage_documentimagecache.delete(cache_filename)
raise
for transformation in transformations:
converter.transform(transformation=transformation)
return converter.get_page()
def get_image(self, size=None, as_base64=False, transformations=None):
converter = converter_class(file_object=open(self.get_full_path()))
if size:
converter.transform(transformation=TransformationResize(
**dict(zip(('width', 'height'), (size.split('x'))))))
# Interactive transformations
for transformation in transformations:
converter.transform(transformation=transformation)
return converter.get_page(as_base64=as_base64)
def get_image(self, transformations=None):
cache_filename = self.cache_filename
logger.debug('Page cache filename: %s', cache_filename)
if not setting_disable_base_image_cache.value and cache_storage_backend.exists(cache_filename):
logger.debug('Page cache file "%s" found', cache_filename)
converter = converter_class(
file_object=cache_storage_backend.open(cache_filename)
)
converter.seek(0)
else:
logger.debug('Page cache file "%s" not found', cache_filename)
try:
converter = converter_class(
file_object=self.document_version.get_intermidiate_file()
)
converter.seek(page_number=self.page_number - 1)
page_image = converter.get_page()
with cache_storage_backend.open(cache_filename, 'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating page cache file "%s"; %s',
cache_filename, exception
)
cache_storage_backend.delete(cache_filename)
raise
for transformation in transformations:
converter.transform(transformation=transformation)
return converter.get_page()
def get_image(self, size=None, as_base64=True, transformations=None):
converter = converter_class(file_object=open(self.get_full_path()))
if size:
converter.transform(transformation=TransformationResize(
**dict(zip(('width', 'height'), (size.split('x'))))))
# Interactive transformations
for transformation in transformations:
converter.transform(transformation=transformation)
image_data = converter.get_page()
if as_base64:
base64_data = base64.b64encode(image_data.read())
return 'data:%s;base64,%s' % ('image/png', base64_data)
else:
return image_data
def get_image(self, size=None, as_base64=True, transformations=None):
converter = converter_class(file_object=open(self.get_full_path()))
if size:
converter.transform(
transformation=TransformationResize(
**dict(zip(('width', 'height'), (size.split('x'))))
)
)
# Interactive transformations
for transformation in transformations:
converter.transform(transformation=transformation)
image_data = converter.get_page()
if as_base64:
base64_data = base64.b64encode(image_data.read())
return 'data:%s;base64,%s' % ('image/png', base64_data)
else:
return image_data
def get_image(self, *args, **kwargs):
as_base64 = kwargs.pop('as_base64', False)
transformations = kwargs.pop('transformations', [])
size = kwargs.pop('size', setting_display_size.value)
rotation = int(
kwargs.pop('rotation', DEFAULT_ROTATION) or DEFAULT_ROTATION
)
zoom_level = int(
kwargs.pop('zoom', DEFAULT_ZOOM_LEVEL) or DEFAULT_ZOOM_LEVEL
)
if zoom_level < setting_zoom_min_level.value:
zoom_level = setting_zoom_min_level.value
if zoom_level > setting_zoom_max_level.value:
zoom_level = setting_zoom_max_level.value
rotation = rotation % 360
cache_filename = self.cache_filename
logger.debug('Page cache filename: %s', cache_filename)
if cache_storage_backend.exists(cache_filename):
logger.debug('Page cache file "%s" found', cache_filename)
converter = converter_class(
file_object=cache_storage_backend.open(cache_filename)
)
converter.seek(0)
else:
logger.debug('Page cache file "%s" not found', cache_filename)
try:
converter = converter_class(
file_object=self.document_version.get_intermidiate_file()
)
converter.seek(page_number=self.page_number - 1)
page_image = converter.get_page()
with cache_storage_backend.open(cache_filename, 'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error(
'Error creating page cache file "%s"; %s',
cache_filename, exception
)
cache_storage_backend.delete(cache_filename)
raise
# Stored transformations
for stored_transformation in Transformation.objects.get_for_model(self, as_classes=True):
converter.transform(transformation=stored_transformation)
# Interactive transformations
for transformation in transformations:
converter.transform(transformation=transformation)
if rotation:
converter.transform(transformation=TransformationRotate(
degrees=rotation)
)
if size:
converter.transform(transformation=TransformationResize(
**dict(zip(('width', 'height'), (size.split('x')))))
)
if zoom_level:
converter.transform(
transformation=TransformationZoom(percent=zoom_level)
)
page_image = converter.get_page()
if as_base64:
# TODO: don't prepend 'data:%s;base64,%s' part
return 'data:%s;base64,%s' % (
'image/png', base64.b64encode(page_image.getvalue())
)
else:
return page_image
def get_image(self, *args, **kwargs):
as_base64 = kwargs.pop('as_base64', False)
transformations = kwargs.pop('transformations', [])
size = kwargs.pop('size', setting_display_size.value)
rotation = int(
kwargs.pop('rotation', DEFAULT_ROTATION) or DEFAULT_ROTATION)
zoom_level = int(
kwargs.pop('zoom', DEFAULT_ZOOM_LEVEL) or DEFAULT_ZOOM_LEVEL)
if zoom_level < setting_zoom_min_level.value:
zoom_level = setting_zoom_min_level.value
if zoom_level > setting_zoom_max_level.value:
zoom_level = setting_zoom_max_level.value
rotation = rotation % 360
cache_filename = self.cache_filename
logger.debug('Page cache filename: %s', cache_filename)
if cache_storage_backend.exists(cache_filename):
logger.debug('Page cache file "%s" found', cache_filename)
converter = converter_class(
file_object=cache_storage_backend.open(cache_filename))
converter.seek(0)
else:
logger.debug('Page cache file "%s" not found', cache_filename)
try:
converter = converter_class(
file_object=self.document_version.get_intermidiate_file())
converter.seek(page_number=self.page_number - 1)
page_image = converter.get_page()
with cache_storage_backend.open(cache_filename,
'wb+') as file_object:
file_object.write(page_image.getvalue())
except Exception as exception:
# Cleanup in case of error
logger.error('Error creating page cache file "%s"; %s',
cache_filename, exception)
cache_storage_backend.delete(cache_filename)
raise
# Stored transformations
for stored_transformation in Transformation.objects.get_for_model(
self, as_classes=True):
converter.transform(transformation=stored_transformation)
# Interactive transformations
for transformation in transformations:
converter.transform(transformation=transformation)
if rotation:
converter.transform(transformation=TransformationRotate(
degrees=rotation))
if size:
converter.transform(transformation=TransformationResize(
**dict(zip(('width', 'height'), (size.split('x'))))))
if zoom_level:
converter.transform(transformation=TransformationZoom(
percent=zoom_level))
page_image = converter.get_page()
if as_base64:
# TODO: don't prepend 'data:%s;base64,%s' part
return 'data:%s;base64,%s' % (
'image/png', base64.b64encode(page_image.getvalue()))
else:
return page_image