mirror of
https://github.com/Hopiu/django-imagekit.git
synced 2026-03-17 05:40:25 +00:00
7ad5cf4db5
While this change means users can no longer specify their own filenames, changing a property of a processor, for example, will now result in a new image. This solves a lot of the previous invalidation issues.
93 lines
3.2 KiB
Python
93 lines
3.2 KiB
Python
from django.conf import settings
|
|
from hashlib import md5
|
|
import os
|
|
import pickle
|
|
from .lib import StringIO
|
|
from .processors import ProcessorPipeline
|
|
from .utils import (img_to_fobj, open_image, IKContentFile, extension_to_format,
|
|
suggest_extension, UnknownExtensionError)
|
|
|
|
|
|
class SpecFileGenerator(object):
|
|
def __init__(self, processors=None, format=None, options=None,
|
|
autoconvert=True, storage=None):
|
|
self.processors = processors
|
|
self.format = format
|
|
self.options = options or {}
|
|
self.autoconvert = autoconvert
|
|
self.storage = storage
|
|
|
|
def get_processors(self, source_file):
|
|
processors = self.processors
|
|
if callable(processors):
|
|
processors = processors(source_file)
|
|
return processors
|
|
|
|
def process_content(self, content, filename=None, source_file=None):
|
|
img = open_image(content)
|
|
original_format = img.format
|
|
|
|
# Run the processors
|
|
processors = self.get_processors(source_file)
|
|
img = ProcessorPipeline(processors or []).process(img)
|
|
|
|
options = dict(self.options or {})
|
|
|
|
# Determine the format.
|
|
format = self.format
|
|
if filename and not format:
|
|
# Try to guess the format from the extension.
|
|
extension = os.path.splitext(filename)[1].lower()
|
|
if extension:
|
|
try:
|
|
format = extension_to_format(extension)
|
|
except UnknownExtensionError:
|
|
pass
|
|
format = format or img.format or original_format or 'JPEG'
|
|
|
|
imgfile = img_to_fobj(img, format, **options)
|
|
content = IKContentFile(filename, imgfile.read(), format=format)
|
|
return img, content
|
|
|
|
def generate_filename(self, source_file):
|
|
source_filename = source_file.name
|
|
filename = None
|
|
if source_filename:
|
|
hash = md5(''.join([
|
|
pickle.dumps(self.get_processors(source_file)),
|
|
self.format,
|
|
pickle.dumps(self.options),
|
|
str(self.autoconvert),
|
|
])).hexdigest()
|
|
extension = suggest_extension(source_filename, self.format)
|
|
|
|
filename = os.path.normpath(os.path.join(
|
|
settings.IMAGEKIT_CACHE_DIR,
|
|
os.path.splitext(source_filename)[0],
|
|
'%s%s' % (hash, extension)))
|
|
|
|
return filename
|
|
|
|
def generate_file(self, filename, source_file, save=True):
|
|
"""
|
|
Generates a new image file by processing the source file and returns
|
|
the content of the result, ready for saving.
|
|
|
|
"""
|
|
if source_file: # TODO: Should we error here or something if the source_file doesn't exist?
|
|
# Process the original image file.
|
|
|
|
try:
|
|
fp = source_file.storage.open(source_file.name)
|
|
except IOError:
|
|
return
|
|
fp.seek(0)
|
|
fp = StringIO(fp.read())
|
|
|
|
img, content = self.process_content(fp, filename, source_file)
|
|
|
|
if save:
|
|
storage = self.storage or source_file.storage
|
|
storage.save(filename, content)
|
|
|
|
return content
|