def generate_image(self, *args, **kwargs):
transformation_list = self.get_combined_transformation_list(*args, **kwargs)
cache_filename = '{}-{}'.format(
self.cache_filename, BaseTransformation.combine(transformation_list)
)
# Check is transformed image is available
logger.debug('transformations cache filename: %s', cache_filename)
if not setting_disable_transformed_image_cache.value and storage_documentimagecache.exists(cache_filename):
logger.debug(
'transformations cache file "%s" found', cache_filename
)
else:
logger.debug(
'transformations cache file "%s" not found', cache_filename
)
image = self.get_image(transformations=transformation_list)
with storage_documentimagecache.open(cache_filename, 'wb+') as file_object:
file_object.write(image.getvalue())
self.cached_images.create(filename=cache_filename)
return cache_filename
def get_api_image_url(self, *args, **kwargs):
"""
Create an unique URL combining:
- the page's image URL
- the interactive argument
- a hash from the server side and interactive transformations
The purpose of this unique URL is to allow client side caching
if document page images.
"""
transformations_hash = BaseTransformation.combine(
self.get_combined_transformation_list(*args, **kwargs)
)
kwargs.pop('transformations', None)
final_url = furl()
final_url.args = kwargs
final_url.path = reverse(
viewname='rest_api:documentpage-image', kwargs={
'pk': self.document.pk, 'version_pk': self.document_version.pk,
'page_pk': self.pk
}
)
final_url.args['_hash'] = transformations_hash
return final_url.tostr()
def generate_image(self, user=None, **kwargs):
transformation_list = self.get_combined_transformation_list(user=user, **kwargs)
combined_cache_filename = BaseTransformation.combine(transformation_list)
# Check is transformed image is available
logger.debug('transformations cache filename: %s', combined_cache_filename)
try:
lock = LockingBackend.get_instance().acquire_lock(
name='document_page_generate_image_{}_{}'.format(
self.pk, combined_cache_filename
)
)
except Exception:
raise
else:
# Second try block to release the lock even on fatal errors inside
# the block.
try:
if self.cache_partition.get_file(filename=combined_cache_filename):
logger.debug(
'transformations cache file "%s" found', combined_cache_filename
)
else:
logger.debug(
'transformations cache file "%s" not found', combined_cache_filename
)
image = self.get_image(transformations=transformation_list)
with self.cache_partition.create_file(filename=combined_cache_filename) as file_object:
file_object.write(image.getvalue())
return combined_cache_filename
finally:
lock.release()
def generate_image(self, user=None, **kwargs):
transformation_list = self.get_combined_transformation_list(user=user, **kwargs)
combined_cache_filename = BaseTransformation.combine(transformation_list)
# Check is transformed image is available
logger.debug('transformations cache filename: %s', combined_cache_filename)
if not setting_disable_transformed_image_cache.value and self.cache_partition.get_file(filename=combined_cache_filename):
logger.debug(
'transformations cache file "%s" found', combined_cache_filename
)
else:
logger.debug(
'transformations cache file "%s" not found', combined_cache_filename
)
image = self.get_image(transformations=transformation_list)
with self.cache_partition.create_file(filename=combined_cache_filename) as file_object:
file_object.write(image.getvalue())
return combined_cache_filename
from django.utils.translation import ugettext_lazy as _
from mayan.apps.converter.transformations import (
BaseTransformation, TransformationDrawRectanglePercent
)
from .layers import layer_redactions
class TransformationRedactionPercent(TransformationDrawRectanglePercent):
arguments = ('left', 'top', 'right', 'bottom')
label = _('Redaction')
name = 'redaction_percent'
template_name = 'redactions/cropper.html'
BaseTransformation.register(
layer=layer_redactions, transformation=TransformationRedactionPercent
)