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images.py
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images.py
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import json
import os
import platform
import re
from urllib.error import URLError
from urllib.parse import quote, quote_plus, urlsplit, urlunsplit
from urllib.request import urlopen, Request
from django.core.files.base import File, ContentFile
from django.core.files.storage import Storage # , default_storage
from django.utils.encoding import force_str
from django.utils.functional import LazyObject, empty
from sorl.thumbnail import default
from sorl.thumbnail.conf import settings
from sorl.thumbnail.default import storage as default_storage
from sorl.thumbnail.helpers import ThumbnailError, tokey, get_module_class, deserialize
from sorl.thumbnail.parsers import parse_geometry
url_pat = re.compile(r'^(https?|ftp):\/\/')
def serialize_image_file(image_file):
if image_file.size is None:
raise ThumbnailError('Trying to serialize an ``ImageFile`` with a '
'``None`` size.')
data = {
'name': image_file.name,
'storage': image_file.serialize_storage(),
'size': image_file.size,
}
return json.dumps(data)
def deserialize_image_file(s):
data = deserialize(s)
class LazyStorage(LazyObject):
def _setup(self):
self._wrapped = get_module_class(data['storage'])()
image_file = ImageFile(data['name'], LazyStorage())
image_file.set_size(data['size'])
return image_file
class BaseImageFile:
size = []
def exists(self):
raise NotImplementedError()
@property
def width(self):
return self.size[0]
x = width
@property
def height(self):
return self.size[1]
y = height
def is_portrait(self):
return self.y > self.x
@property
def ratio(self):
return float(self.x) / float(self.y)
@property
def url(self):
raise NotImplementedError()
src = url
class ImageFile(BaseImageFile):
_size = None
def __init__(self, file_, storage=None):
if not file_:
raise ThumbnailError('File is empty.')
# figure out name
if hasattr(file_, 'name'):
self.name = file_.name
else:
self.name = force_str(file_)
# TODO: Add a customizable naming method as a signal
# Remove query args from names. Fixes cache and signature arguments
# from third party services, like Amazon S3 and signature args.
if settings.THUMBNAIL_REMOVE_URL_ARGS:
self.name = self.name.split('?')[0]
# Support for relative protocol urls
if self.name.startswith('//'):
self.name = 'http:' + self.name
# figure out storage
if storage is not None:
self.storage = storage
elif hasattr(file_, 'storage'):
self.storage = file_.storage
elif url_pat.match(self.name):
self.storage = UrlStorage()
else:
self.storage = default_storage
if hasattr(self.storage, 'location'):
location = self.storage.location
if not self.storage.location.endswith("/"):
location += "/"
if self.name.startswith(location):
self.name = self.name[len(location):]
def __str__(self):
return self.name
def exists(self):
return self.storage.exists(self.name)
def set_size(self, size=None):
# set the size if given
if size is not None:
pass
# Don't try to set the size the expensive way if it already has a
# value.
elif self._size is not None:
return
elif hasattr(self.storage, 'image_size'):
# Storage backends can implement ``image_size`` method that
# optimizes this.
size = self.storage.image_size(self.name)
else:
# This is the worst case scenario
image = default.engine.get_image(self)
size = default.engine.get_image_size(image)
if self.flip_dimensions(image):
size = list(size)
size.reverse()
self._size = list(size)
def flip_dimensions(self, image):
"""
Do not manipulate image, but ask engine whether we'd be doing a 90deg
rotation at some point.
"""
return default.engine.flip_dimensions(image)
@property
def size(self):
return self._size
@property
def url(self):
return self.storage.url(self.name)
def read(self):
f = self.storage.open(self.name)
try:
return f.read()
finally:
f.close()
def write(self, content):
if not isinstance(content, File):
content = ContentFile(content)
self._size = None
self.name = self.storage.save(self.name, content)
return self.name
def delete(self):
return self.storage.delete(self.name)
def serialize_storage(self):
if isinstance(self.storage, LazyObject):
# if storage is wrapped in a lazy object we need to get the real
# thing.
if self.storage._wrapped is empty:
self.storage._setup()
cls = self.storage._wrapped.__class__
else:
cls = self.storage.__class__
return '%s.%s' % (cls.__module__, cls.__name__)
@property
def key(self):
return tokey(self.name, self.serialize_storage())
def serialize(self):
return serialize_image_file(self)
class DummyImageFile(BaseImageFile):
def __init__(self, geometry_string):
self.size = parse_geometry(
geometry_string,
settings.THUMBNAIL_DUMMY_RATIO,
)
def exists(self):
return True
@property
def url(self):
return settings.THUMBNAIL_DUMMY_SOURCE % (
{'width': self.x, 'height': self.y}
)
class UrlStorage(Storage):
def normalize_url(self, url, charset="utf-8"):
# Convert URL to ASCII before processing
url = url.encode(charset, errors="ignore")
url = url.decode("ascii", errors="ignore")
scheme, netloc, path, qs, anchor = urlsplit(url)
path = quote(path, b"/%")
qs = quote_plus(qs, b":&%=")
return urlunsplit((scheme, netloc, path, qs, anchor))
def open(self, name, mode='rb'):
url = self.normalize_url(name)
python_version = platform.python_version_tuple()[0]
user_agent = "python-urllib{python_version}/0.6".format(python_version=python_version)
req = Request(url, headers={"User-Agent": user_agent})
return urlopen(req, timeout=settings.THUMBNAIL_URL_TIMEOUT)
def exists(self, name):
try:
self.open(name)
except URLError:
return False
return True
def url(self, name):
return name
def delete(self, name):
pass
def delete_all_thumbnails():
storage = default.storage
path = settings.THUMBNAIL_PREFIX
def walk(path):
dirs, files = storage.listdir(path)
for f in files:
storage.delete(os.path.join(path, f))
for d in dirs:
directory = os.path.join(path, d)
walk(directory)
try:
full_path = storage.path(directory)
except Exception:
continue
os.rmdir(full_path)
walk(path)