mirror of
https://github.com/jazzband/django-avatar.git
synced 2026-03-16 22:20:30 +00:00
117 lines
3.6 KiB
Python
117 lines
3.6 KiB
Python
import hashlib
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from django.conf import settings
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from django.core.cache import cache
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from django.utils.encoding import smart_str
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from django.template.defaultfilters import slugify
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try:
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from django.contrib.auth import get_user_model
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except ImportError:
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from django.contrib.auth.models import User
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def get_user_model():
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return User
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custom_user_model = False
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else:
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custom_user_model = True
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from avatar.settings import (AVATAR_DEFAULT_URL, AVATAR_CACHE_TIMEOUT,
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AUTO_GENERATE_AVATAR_SIZES, AVATAR_DEFAULT_SIZE)
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cached_funcs = set()
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def get_username(user):
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""" Return username of a User instance """
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if hasattr(user, 'get_username'):
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return user.get_username()
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else:
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return user.username
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def get_user(username):
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""" Return user from a username/ish identifier """
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if custom_user_model:
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return get_user_model().objects.get_by_natural_key(username)
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else:
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return get_user_model().objects.get(username=username)
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def get_cache_key(user_or_username, size, prefix):
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"""
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Returns a cache key consisten of a username and image size.
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"""
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if isinstance(user_or_username, get_user_model()):
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user_or_username = get_username(user_or_username)
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key = u'%s_%s_%s' % (prefix, user_or_username, size)
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return u'%s_%s' % (slugify(key)[:100],
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hashlib.md5(smart_str(key)).hexdigest())
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def cache_result(func):
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"""
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Decorator to cache the result of functions that take a ``user`` and a
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``size`` value.
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"""
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def cache_set(key, value):
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cache.set(key, value, AVATAR_CACHE_TIMEOUT)
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return value
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def cached_func(user, size):
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prefix = func.__name__
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cached_funcs.add(prefix)
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key = get_cache_key(user, size, prefix=prefix)
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return cache.get(key) or cache_set(key, func(user, size))
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return cached_func
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def invalidate_cache(user, size=None):
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"""
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Function to be called when saving or changing an user's avatars.
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"""
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sizes = set(AUTO_GENERATE_AVATAR_SIZES)
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if size is not None:
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sizes.add(size)
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for prefix in cached_funcs:
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for size in sizes:
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cache.delete(get_cache_key(user, size, prefix))
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def get_default_avatar_url():
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base_url = getattr(settings, 'STATIC_URL', None)
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if not base_url:
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base_url = getattr(settings, 'MEDIA_URL', '')
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# Don't use base_url if the default avatar url starts with http:// of https://
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if AVATAR_DEFAULT_URL.startswith('http://') or AVATAR_DEFAULT_URL.startswith('https://'):
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return AVATAR_DEFAULT_URL
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# We'll be nice and make sure there are no duplicated forward slashes
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ends = base_url.endswith('/')
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begins = AVATAR_DEFAULT_URL.startswith('/')
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if ends and begins:
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base_url = base_url[:-1]
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elif not ends and not begins:
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return '%s/%s' % (base_url, AVATAR_DEFAULT_URL)
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return '%s%s' % (base_url, AVATAR_DEFAULT_URL)
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def get_primary_avatar(user, size=AVATAR_DEFAULT_SIZE):
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User = get_user_model()
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if not isinstance(user, User):
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try:
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user = get_user(user)
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except User.DoesNotExist:
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return None
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try:
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# Order by -primary first; this means if a primary=True avatar exists
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# it will be first, and then ordered by date uploaded, otherwise a
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# primary=False avatar will be first. Exactly the fallback behavior we
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# want.
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avatar = user.avatar_set.order_by("-primary", "-date_uploaded")[0]
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except IndexError:
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avatar = None
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if avatar:
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if not avatar.thumbnail_exists(size):
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avatar.create_thumbnail(size)
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return avatar
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