mirror of
https://github.com/Hopiu/django-imagekit.git
synced 2026-03-17 05:40:25 +00:00
fe803f8981
Before this is applied, we're going to have to make it so that the image cache strategies are passed the source file, not the other file.
102 lines
4 KiB
Python
102 lines
4 KiB
Python
import os
|
|
|
|
from django.db import models
|
|
from ..files import ProcessedImageFieldFile
|
|
from .utils import ImageSpecFileDescriptor
|
|
from ..receivers import configure_receivers
|
|
from ...utils import suggest_extension
|
|
from ...specs import SpecHost, spec_registry
|
|
from ...specs.sources import ImageFieldSpecSource
|
|
|
|
|
|
class ImageSpecField(SpecHost):
|
|
"""
|
|
The heart and soul of the ImageKit library, ImageSpecField allows you to add
|
|
variants of uploaded images to your models.
|
|
|
|
"""
|
|
def __init__(self, processors=None, format=None, options=None,
|
|
image_field=None, storage=None, autoconvert=None,
|
|
image_cache_backend=None, image_cache_strategy=None, spec=None,
|
|
id=None):
|
|
|
|
# The spec accepts a callable value for processors, but it
|
|
# takes different arguments than the callable that ImageSpecField
|
|
# expects, so we create a partial application and pass that instead.
|
|
# TODO: Should we change the signatures to match? Even if `instance` is not part of the signature, it's accessible through the source file object's instance property.
|
|
p = lambda file: processors(instance=file.instance,
|
|
file=file) if callable(processors) else processors
|
|
|
|
SpecHost.__init__(self, processors=p, format=format,
|
|
options=options, storage=storage, autoconvert=autoconvert,
|
|
image_cache_backend=image_cache_backend,
|
|
image_cache_strategy=image_cache_strategy, spec=spec,
|
|
spec_id=id)
|
|
|
|
self.image_field = image_field
|
|
|
|
@property
|
|
def storage(self):
|
|
return self.spec.storage
|
|
|
|
def contribute_to_class(self, cls, name):
|
|
setattr(cls, name, ImageSpecFileDescriptor(self, name))
|
|
|
|
# Generate a spec_id to register the spec with. The default spec id is
|
|
# "<app>:<model>_<field>"
|
|
if not getattr(self, 'spec_id', None):
|
|
self.spec_id = (u'%s:%s_%s' % (cls._meta.app_label,
|
|
cls._meta.object_name, name)).lower()
|
|
|
|
# Register the spec with the id. This allows specs to be overridden
|
|
# later, from outside of the model definition.
|
|
self.set_spec_id(self.spec_id)
|
|
|
|
# Register the model and field as a source for this spec id
|
|
spec_registry.add_source(self.spec_id,
|
|
ImageFieldSpecSource(cls, self.image_field))
|
|
|
|
|
|
class ProcessedImageField(models.ImageField, SpecHost):
|
|
"""
|
|
ProcessedImageField is an ImageField that runs processors on the uploaded
|
|
image *before* saving it to storage. This is in contrast to specs, which
|
|
maintain the original. Useful for coercing fileformats or keeping images
|
|
within a reasonable size.
|
|
|
|
"""
|
|
attr_class = ProcessedImageFieldFile
|
|
|
|
def __init__(self, processors=None, format=None, options=None,
|
|
verbose_name=None, name=None, width_field=None, height_field=None,
|
|
autoconvert=True, spec=None, spec_id=None, **kwargs):
|
|
"""
|
|
The ProcessedImageField constructor accepts all of the arguments that
|
|
the :class:`django.db.models.ImageField` constructor accepts, as well
|
|
as the ``processors``, ``format``, and ``options`` arguments of
|
|
:class:`imagekit.models.ImageSpecField`.
|
|
|
|
"""
|
|
SpecHost.__init__(self, processors=processors, format=format,
|
|
options=options, autoconvert=autoconvert, spec=spec,
|
|
spec_id=spec_id)
|
|
models.ImageField.__init__(self, verbose_name, name, width_field,
|
|
height_field, **kwargs)
|
|
|
|
def get_filename(self, filename):
|
|
filename = os.path.normpath(self.storage.get_valid_name(
|
|
os.path.basename(filename)))
|
|
name, ext = os.path.splitext(filename)
|
|
ext = suggest_extension(filename, self.spec.format)
|
|
return u'%s%s' % (name, ext)
|
|
|
|
|
|
try:
|
|
from south.modelsinspector import add_introspection_rules
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
add_introspection_rules([], [r'^imagekit\.models\.fields\.ProcessedImageField$'])
|
|
|
|
|
|
configure_receivers()
|