118 lines
3.4 KiB
Python
118 lines
3.4 KiB
Python
import httpx
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from django.conf import settings
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from django.core.cache import caches
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from django.http import Http404, HttpResponse
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from django.shortcuts import get_object_or_404
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from django.views.generic import View
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from activities.models import Emoji, PostAttachment
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from users.models import Identity
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class BaseCacheView(View):
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"""
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Base class for caching remote content.
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"""
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cache_name = "media"
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item_timeout: int | None = None
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def get(self, request, **kwargs):
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self.kwargs = kwargs
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remote_url = self.get_remote_url()
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cache = caches[self.cache_name]
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cache_key = "proxy_" + remote_url
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# See if it's already cached
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cached_content = cache.get(cache_key)
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if not cached_content:
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# OK, fetch and cache it
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try:
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remote_response = httpx.get(
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remote_url,
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headers={"User-Agent": settings.TAKAHE_USER_AGENT},
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follow_redirects=True,
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timeout=settings.SETUP.REMOTE_TIMEOUT,
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)
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except httpx.RequestError:
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return HttpResponse(status=502)
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if remote_response.status_code >= 400:
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return HttpResponse(status=502)
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# We got it - shove it into the cache
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cached_content = {
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"content": remote_response.content,
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"mimetype": remote_response.headers.get(
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"Content-Type", "application/octet-stream"
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),
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}
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cache.set(cache_key, cached_content, timeout=self.item_timeout)
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return HttpResponse(
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cached_content["content"],
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headers={
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"Content-Type": cached_content["mimetype"],
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"Cache-Control": "public, max-age=3600",
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},
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)
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def get_remote_url(self):
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raise NotImplementedError()
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class EmojiCacheView(BaseCacheView):
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"""
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Caches Emoji
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"""
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item_timeout = 86400 * 7 # One week
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def get_remote_url(self):
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self.emoji = get_object_or_404(Emoji, pk=self.kwargs["emoji_id"])
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if not self.emoji.remote_url:
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raise Http404()
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return self.emoji.remote_url
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class IdentityIconCacheView(BaseCacheView):
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"""
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Caches identity icons (avatars)
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"""
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cache_name = "avatars"
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item_timeout = 86400 * 7 # One week
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def get_remote_url(self):
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self.identity = get_object_or_404(Identity, pk=self.kwargs["identity_id"])
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if self.identity.local or not self.identity.icon_uri:
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raise Http404()
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return self.identity.icon_uri
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class IdentityImageCacheView(BaseCacheView):
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"""
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Caches identity profile header images
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"""
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item_timeout = 86400 * 7 # One week
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def get_remote_url(self):
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self.identity = get_object_or_404(Identity, pk=self.kwargs["identity_id"])
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if self.identity.local or not self.identity.image_uri:
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raise Http404()
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return self.identity.image_uri
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class PostAttachmentCacheView(BaseCacheView):
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"""
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Caches post media (images only, videos should always be offloaded to remote)
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"""
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item_timeout = 86400 * 7 # One week
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def get_remote_url(self):
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self.post_attachment = get_object_or_404(
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PostAttachment, pk=self.kwargs["attachment_id"]
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)
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if not self.post_attachment.is_image():
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raise Http404()
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return self.post_attachment.remote_url
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